Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberCN1197525 C
Publication typeGrant
Application numberCN 01141671
Publication date20 Apr 2005
Filing date8 Oct 2001
Priority date6 Oct 2000
Also published asCN1347682A, EP1205761A2, EP1205761A3, US6448772, US20020043975
Publication number01141671.8, CN 01141671, CN 1197525 C, CN 1197525C, CN-C-1197525, CN01141671, CN01141671.8, CN1197525 C, CN1197525C
Inventors青木雅昭
Applicant株式会社新王磁材
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
Apparatus for magnetic field regulation, magnetic field regulating method
CN 1197525 C
Abstract  translated from Chinese
本发明的磁场调节用装置,根据磁场发生装置的空隙的预定部位磁场强度、把调节片配置在磁场发生装置预定位置时的磁场变化量、磁场均匀度的目标值,用线形计画法算出配置磁场调节片的位置及个数。 Magnetic field adjustment device of the present invention, according to a predetermined portion of the magnetic field strength of the magnetic field generating device voids the flap configuration of the magnetic fields change means a predetermined position in the magnetic field occurs when magnetic field homogeneity of the target is calculated using the linear configuration Planning Act magnetic flap position and number. 根据磁场调节片的位置及个数,算出磁场均匀度的预想值。 Depending on the location and number of magnetic flap, the expected value is calculated magnetic field uniformity. 把该磁场均匀度的预想值为预定值以下时的磁场调节片的位置及个数,显示在显示部上。 The location and number of the expected value of the predetermined value of the magnetic field uniformity below the flap, displayed on the display unit. 作业者根据该显示,将磁场调节片配置在磁场发生装置上。 Operator according to the display, the flap magnetic field generating device disposed on. 如果磁场均匀度的预想值大于预定值,再用直接探索法,对每个磁场调节片位置,算出磁场均匀度的预想值。 If the expected value of the magnetic field uniformity is greater than a predetermined value, and then direct exploration methods, the flap position for each field, calculating the expected value of the magnetic field uniformity. 选择磁场均匀度的预想值为最小的磁场调节片的位置及个数,显示在显示部上。 Select the desired magnetic field uniformity of the magnetic field is minimal and the number of flap position, is displayed on the display unit. 作业者根据该显示,把磁场调节片配置在磁场发生装置上。 Operator according to the display, the flap configuration of the magnetic field on the magnetic field generating means.
Claims(8)  translated from Chinese
1.磁场调节用装置,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于该磁场调节用装置具有:测定所述空隙的预定部位磁场强度的机构;存储把磁场调节片配置在所述磁场发生装置的预定位置时的磁场变化量的机构;输入磁场均匀度的目标值的机构;根据所述磁场强度、磁场变化量和目标值,利用数理计画法、数理计画法+直接探索法中任一方法,计算所述磁场调节片的位置和个数及磁场均匀度的预想值的机构; 以及输出所述磁场调节片的位置和个数的输出机构。 1. The magnetic field adjusting means for adjusting the gap magnetic field generating means, which comprises a magnetic field generating means disposed opposite a pair of plate yokes, and provided at each of opposite side surfaces of the pair of plate yokes permanent magnets, characterized in that the field adjusting device comprising: measuring means a predetermined portion of the magnetic field strength of the voids; flap configuration stored magnetic field variation in the magnetic field of the magnetic field generating means a predetermined position when the apparatus; input field homogeneity target value of the degree of organization; according to the magnetic field strength, magnetic variation and the target, the use of mathematical plan, mathematical planning method and direct method to explore in any one of the methods to calculate the position of the magnetic field and the number of flap and organizations expected value of the magnetic field uniformity; and outputting the field flap position and number of output mechanism.
2.磁场调节用装置,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁;其特征在于该磁场调节用装置具有:测定所述空隙的预定部位磁场强度的机构;存储将磁场调节片配置在所述磁场发生装置的预定位置时的磁场变化量的机构;根据所述磁场强度和磁场变化量,对每个磁场调节片的位置,计算把磁场调节片配置在磁场发生装置预定位置时的磁场均匀度的预想值的计算机构;以及输出所述磁场均匀度的预想值为最小时的、所述磁场调节片的位置和个数的输出机构。 2. The magnetic field adjusting means for adjusting the gap magnetic field generating means, the apparatus comprising a pair of opposite configuration of the magnetic field generator of plate yokes, and provided at each of opposite side surfaces of the pair of plate yokes permanent magnet; characterized in that the magnetic field adjusting means has: determining the predetermined gap magnetic field strength of the mechanism portion; storing the magnetic field variation flap configuration mechanism occurs at a predetermined position of the device when the magnetic field; according to the and the expected value of the output of the magnetic field uniformity; the amount of magnetic field strength and the magnetic field changes, the position of each flap magnetic flap configured to calculate the magnetic field at the magnetic field generating means a predetermined position of the magnetic field uniformity expected value calculation means for the most hours of the magnetic flap position and the number of output mechanism.
3.磁场调节方法,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁;其特征在于该方法包括以下步骤:测定上述空隙的预定部位磁场强度的步骤(a);存储将磁场调节片配置在磁场发生装置预定位置时的磁场变化量的步骤(b);输入磁场均匀度的目标值的步骤(c);根据所述磁场强度、磁场变化量和目标值,利用数理计画法、数理计画法+直接探索法中任一方法,计算所述磁场调节片的位置和个数及磁场均匀度的预想值的步骤(d);输出所述磁场调节片的位置和个数的步骤(e);以及根据所述输出的磁场调节片的位置及个数,把磁场调节片配置在磁场发生装置上的步骤(f)。 3. The magnetic field adjustment method for adjusting the magnetic field generating means of the voids, the configuration means comprises a pair of opposed plate yokes, and a permanent magnet disposed in each of the pair of opposing side plate yoke the magnetic field generator ; characterized in that the method comprises the following steps: a step of measuring a predetermined portion of said gap magnetic field intensity (a); storing the magnetic field when the flap arranged at a predetermined position of the magnetic field generating means of the magnetic field variation of step (b); the input magnetic field uniformity target value of the step (c); according to the magnetic field strength, magnetic variation and the target, the use of mathematical plan, mathematical planning method + direct exploration method according to any one of the methods to calculate the position of the magnetic flap and the expected value of the number of steps and magnetic field uniformity (d); output of the magnetic flap position and number of step (e); and the flap of the magnetic field of the output of the position and the number of magnetic field flap configuration steps on the magnetic field generating means (f).
4.如权利要求3所述的磁场调节方法,其特征在于,在所述步骤(e)中输出在所述步骤(d)中算出的磁场调节片的个数为上限值以下时的所述磁场调节片的位置和个数。 4. The magnetic field adjusting method according to claim 3, characterized in that the number of magnetic flap output calculated in said step (d) in said step (e) for the upper limit value or less said location and the number of magnetic flap.
5.磁场调节方法,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁;其特征在于该方法包括以下步骤:测定上述空隙的预定部位磁场强度的步骤(a);存储将磁场调节片配置在磁场发生装置预定位置时的磁场变化量的步骤(b);根据所述磁场强度和磁场变化量,对每个磁场调节片的位置,计算将磁场调节片配置在磁场发生装置预定位置时的磁场均匀度的预想值的步骤(c);输出所述磁场均匀度的预想值为最小时的、所述磁场调节片的位置和个数的步骤(d);以及根据所述输出的磁场调节片的位置及个数,将所述磁场调节片配置在磁场发生装置上的步骤(e)。 5. The magnetic field adjustment method for adjusting the magnetic field generating means of the voids, the configuration means comprises a pair of opposed plate yokes, and a permanent magnet disposed in each of the pair of opposing side plate yoke the magnetic field generator ; characterized in that the method comprises the following steps: Step a predetermined portion of said measuring gap magnetic field strength (a); storing the magnetic field configuration flap means a predetermined amount of change occurs in the magnetic field when the position of the step (b); according to the variation of magnetic field strength and the magnetic field, the position of each flap magnetic field, the magnetic field calculating step flap arranged in the magnetic field uniformity of the expected value of magnetic field generating means when a predetermined position (c); the desired output of the magnetic field uniformity minimum value of the magnetic field and the number of flap position step (d); and adjusting the magnetic field of said sheet output position and the number of the magnetic field on the flap configuration of the magnetic field generating means step (e).
6.如权利要求5所述的磁场调节方法,其特征在于,还包含判断在所述步骤(c)中配置在磁场发生装置上的磁场调节片的个数是否为上限值的步骤,在所述步骤(d)中,当磁场调节片的个数为上限值以下时,输出磁场均匀度的预想值为最小时的、磁场调节片的位置和个数。 6. The magnetic field of claim 5, wherein adjusting method characterized by further comprising a judgment on the magnetic field generating means disposed in said step (c) of the magnetic field of the flap is the upper limit of the number of steps, said step (d), when the number of magnetic flap for the upper limit, the output value of the magnetic field uniformity expected most hours, adjust the position of the magnetic field and the number of tablets.
7.如权利要求3或5所述的磁场调节方法,其特征在于,在所述永久磁铁上设有硅钢板,所述磁场调节片配置在该硅钢板上。 7. The magnetic field adjusting method according to claim 3 or claim 5, characterized in that the silicon steel sheet provided on the permanent magnet, the magnetic field is disposed in the flap silicon steel plate.
8.如权利要求3或5所述的磁场调节方法,其特征在于,所述磁场调节片是磁铁。 3 or 5, wherein the magnetic field 8. The adjusting method as claimed in claim, characterized in that said magnetic field is a magnet flap.
Description  translated from Chinese
磁场调节用装置、磁场调节方法 Magnetic field adjustment device, the magnetic field adjustment method

技术领域 Technical Field

本发明涉及磁场调节用装置、磁场调节方法和记录媒体,具体地说,涉及MRI装置等用的磁场发生装置的磁场调节用装置、磁场调节方法和记录磁场调节用程序的记录媒体。 The present invention relates to a magnetic field adjusting means for adjusting the magnetic recording medium and method and, more particularly, to devices used in MRI magnetic field generating means by means of adjusting the magnetic field and the recording magnetic field adjustment method of adjusting the application of the recording medium.

背景技术 Background

MRI装置用的磁性回路,要求非常严格的磁场均匀度(例如30ppm)。 MRI apparatus magnetic circuit very demanding uniformity of magnetic field (for example 30ppm). 虽然在出厂时调节了磁场,确保了磁场均匀度,但是在运输过程中,由于振动、设置环境等的变化,磁场均匀度常常恶化(例如到达50ppm左右)。 While adjusting the magnetic field at the factory to ensure the uniformity of the magnetic field, but in the transport process, due to changes in the vibration, set up the environment, the magnetic field uniformity is often worse (for example, to reach approximately 50ppm). 因此,在到达MRI装置设置现场时,要用可动轭铁或调节螺栓,再次调节磁场均匀度。 Therefore, when the MRI apparatus reaches the installation site, or use movable yoke adjustment bolt to adjust the uniformity of the magnetic field again. 磁场均匀度用(磁场强度的最大值-磁场强度的最小值)106/(中心磁场强度或平均磁场强度)求出,得到的值越小,表示磁场均匀度越高。 Magnetic field homogeneity with (magnetic field strength maximum value - the minimum magnetic field strength) 106 / (average center magnetic field strength or magnetic field strength) is obtained, the smaller the value obtained, the higher the magnetic field uniformity.

经过该调节,如果磁场均匀度仍达不到预定范围,则必须将把长方体状小磁铁构成的磁场调节片,粘贴在磁极板的硅钢板上,进行最终调节。 After the adjustment, if the magnetic field uniformity is still not reach the predetermined range, it must be small magnet will cuboid magnetic flap, attached to the pole plate of silicon steel sheet, the final regulation.

该情形时,用线形计画法算出粘贴在磁极板上的磁场调节片的位置和个数的技术,在日本特开平9-56692号公报中已揭示。 When this case, calculated by linear planning method magnetic pole plate attached flap position and number of techniques have been disclosed in Japanese Unexamined Patent Publication No. 9-56692 Gazette.

但是,其具体方法未公开,不容易进行磁场调节。 However, it does not disclose the specific method, the magnetic field can not be easily adjusted.

发明内容 DISCLOSURE

为此,本发明的目的是提供一种能容易且高精度地调节磁场的、磁场调节用装置、磁场调节方法和记录媒体。 To this end, an object of the invention is to provide an easily and accurately adjust the magnetic field, the magnetic field adjusting means for adjusting the magnetic recording medium and method.

本发明的一个方面是提供磁场调节用装置,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于该磁场调节用装置具有:测定上述空隙的预定部位磁场强度的机构;存储把磁场调节片配置在上述磁场发生装置的预定位置时的磁场变化量的机构;输入磁场均匀度的目标值的机构;根据上述磁场强度、磁场变化量和上述目标值,利用数理计画法、数理计画法+直接探索法中任一方法,计算磁场调节片的位置和个数及磁场均匀度的预想值的机构;以及输出磁场调节片的位置和个数的输出机构。 One aspect of the invention is to provide a magnetic field adjusting means for adjusting the gap magnetic field generating device, which is disposed opposite to the magnetic field generating means comprises a pair of plate yokes, and provided that one of each pair of plate yokes facing side of the permanent magnet, characterized in that the field adjusting device comprising: a predetermined portion of said measuring gap magnetic field strength of the mechanism; storage flap disposed in a magnetic field variation of the magnetic field means a predetermined position of the device when the magnetic field generator; enter the target's body magnetic field uniformity; according to the intensity of the magnetic field, the magnetic field variation and the target value, the use of mathematical plan, mathematical planning method and direct method to explore in any one of the methods to calculate the position of the magnetic field and a flap the expected value of the number of agencies and the magnetic field uniformity; and outputting magnetic flap position and the number of output mechanism.

本发明的另一个方面是提供磁场调节方法,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于该方法包括以下步骤:测定上述空隙的预定部位磁场强度的步骤(a);存储将磁场调节片配置在磁场发生装置预定位置时的磁场变化量的步骤(b);输入磁场均匀度的目标值的步骤(c);根据上述磁场强度、磁场变化量和上述目标值,利用数理计画法、数理计画法+直接探索法中任一方法,计算磁场调节片的位置和个数及磁场均匀度的预想值的步骤(d);输出磁场调节片的位置和个数的步骤(e);以及根据上述输出的磁场调节片的位置及个数,把磁场调节片配置在磁场发生装置的步骤(f)。 Another aspect of the present invention to provide a method of adjusting the magnetic field, the magnetic field generating means for adjusting the gap of magnetic field generating means comprises a pair of plate-like configuration opposite yokes, and provided that one of each pair of plate yokes facing side of the permanent magnet, characterized in that the method comprises the following steps: Step a predetermined portion of said measuring gap magnetic field strength (a); storing the magnetic field when the flap means arranged at a predetermined position of the magnetic field generating step change amount ( b); the input magnetic field uniformity target of step (c); according to the intensity of the magnetic field, the magnetic field variation and the target value, the use of mathematical plan, mathematical planning method + direct exploration method according to any one of the methods to calculate the magnetic field Steps flap position and the expected value of the number and the magnetic field uniformity (d); output magnetic flap position and number of step (e); and the location and number of the flap of the output of the magnetic field, the magnetic flap configuration in step (f) magnetic field generating means.

本发明的另一个方面是提供计算机可读取的记录媒体,用于记录程序,该程序用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于把以下步骤记录在由计算机执行的程序中:输入上述空隙的预定部位磁场强度的步骤;存储将磁场调节片配置在磁场发生装置预定位置时的磁场变化量的步骤;输入磁场均匀度的目标值的步骤;根据上述磁场强度、磁场变化量和上述目标值,计算磁场调节片的位置和个数的步骤;根据上述磁场调节片的位置和个数,计算磁场均匀度的预想值的步骤;以及输出当磁场均匀度的预想值在预定值以下时的、磁场调节片的位置和个数的步骤。 Another aspect of the present invention to provide a computer-readable recording medium for recording a program which is used to adjust the magnetic field generating means of the gap, means comprising a pair of opposed plate-like configuration of the yoke magnetic field generator, and located in the opposite side of the pair of plate yokes of the permanent magnet, characterized by the following steps recorded in the program executed by the computer: Step input to the gap of a predetermined portion of the magnetic field strength; storing the magnetic flap configuration To enter the target value of the magnetic field uniformity;; step change in the amount of magnetic field generating means when a predetermined position in accordance with the magnetic field strength, magnetic variation and the target value is calculated flap position and the number of steps in a magnetic field; according to Step flap position of the magnetic field and the number of forecast values calculated magnetic field uniformity; and an output when the magnetic field uniformity expected value at a predetermined value or less, magnetic flap position and number of steps.

在本发明中,根据磁场发生装置的空隙的磁场强度、把磁场调节片配置在磁场发生装置预定位置时的磁场变化量、磁场均匀度目标值,例如用线形计画法算出配置磁场调节片的位置及个数。 In the present invention, the magnetic field strength of the magnetic field generating means of the voids, the amount of the magnetic field variation flap configuration at a predetermined position of the magnetic field generating means, the magnetic field uniformity of the target, for example, calculated by a linear plan configuration field method flap location and number. 根据磁场调节片的位置及个数,算出磁场均匀度的预想值。 Depending on the location and number of magnetic flap, the expected value is calculated magnetic field uniformity. 把该磁场均匀度的预想值为预定值以下时的磁场调节片的位置及个数,输出在显示部上。 The location and number of the expected value of the predetermined value of the magnetic field uniformity below the flap, the output on the display unit. 作业者只要根据该输出配置磁场调节片即可。 As long as the operator can configure the magnetic flap based on the output. 所以,根据输入的目标值,可用少的磁场调节片高精度地调节磁场。 Therefore, according to the target input field flap less available precisely adjusting the magnetic field.

另外,优选判断算出的磁场调节片的个数是否是在上限值以下。 Further, the number of magnetic flap preferably is judged whether the calculated upper limit value. 把磁场调节片的个数为上限值以下时的磁场均匀度的预想值,与预定值比较,输出该预想值为预定值以下时的磁场调节片的位置和个数。 The flap of the number of magnetic field on the expected value of the magnetic field uniformity limits below, and compared with a predetermined value, the output value of the expected field below a predetermined value when adjusting the position and number of pieces. 这样,对配置的磁场调节片的个数设定上限值,可以用更少的磁场调节片调节磁场。 Thus, the configuration of the magnetic flap setting the upper limit number, you can use less magnetic flap adjusting the magnetic field.

另外,当磁场均匀度的预想值大于预定值时,优选对每个磁场调节片位置,进一步算出把磁场调节片配置在磁场发生装置预定位置时的磁场均匀度预想值。 In addition, when the expected value of the magnetic field uniformity is greater than a predetermined value, preferably flap position for each field, and calculates the magnetic flap arranged at a predetermined position when a magnetic field generating means of the magnetic field uniformity expected value. 并且,输出磁场均匀度的预想值为最小时的磁场调节片的位置及个数,根据输出的磁场调节片的位置及个数,把磁场调节片配置在磁场发生装置上。 Further, the expected value of the output of the magnetic field homogeneity adjusting the position of minimum magnetic field and the number of pieces, adjust the position of the magnetic field and the number of output sheets, the flap is disposed on the magnetic field generating means.

这样,如果磁场均匀度的预想值大于预定值,例如进一步用直接探索法算出磁场均匀度的预想值,选择并输出磁场均匀度的预想值为最小时的磁场调节片的位置及个数。 Thus, if the expected value of the magnetic field uniformity is greater than a predetermined value, for example, and calculates the expected value of the magnetic field uniformity direct exploration method, select and output the expected value of the magnetic field uniformity of the magnetic field adjusting the position of the hours and number of pieces. 因此,作业者根据该输出,把磁场调节片配置在磁场发生装置上,可更高精度地调节磁场。 Thus, based on the output of the operator, the flap magnetic field generating means disposed on, the magnetic field can be more accurately adjusted.

本发明另一个方面是提供磁场调节用装置,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于该磁场调节用装置具有:测定上述空隙的预定部位磁场强度的机构;存储将磁场调节片配置在上述磁场发生装置的预定位置时的磁场变化量的机构;根据上述磁场强度和磁场变化量,对每个磁场调节片的位置,计算将磁场调节片配置在磁场发生装置预定位置时的磁场均匀度的预想值的计算机构;输出上述磁场均匀度的预想值为最小时的、磁场调节片的位置和个数的机构。 Another aspect of the present invention is to provide a magnetic field adjusting means for adjusting the gap magnetic field generating device, which is disposed opposite to the magnetic field generating means comprises a pair of plate yokes, and provided that one of each pair of plate yokes facing side of the permanent magnet, characterized in that the field adjusting device comprising: a predetermined portion of said measuring gap magnetic field strength of the mechanism; storing the magnetic field configuration flap position means a predetermined amount of change in said magnetic field generating mechanism; According to the amount of change in magnetic field strength and the magnetic field, the position of each flap magnetic flap to calculate the magnetic field configuration of the magnetic field uniformity means a predetermined position in the magnetic field occurs when the expected value calculation means; the expected value of the output of the magnetic field uniformity for the most hours of magnetic flap position and the number of institutions.

本发明的另一个方面是提供磁场调节方法,用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于该方法包括以下步骤:测定上述空隙的预定部位磁场强度的步骤(a);存储将磁场调节片配置在磁场发生装置预定位置时的磁场变化量的步骤(b);根据上述磁场强度和磁场变化量,对每个磁场调节片的位置,计算将磁场调节片配置在磁场发生装置预定位置时的磁场均匀度的预想值的步骤(c);输出上述磁场均匀度的预想值为最小时的、磁场调节片的位置和个数的步骤(d);以及根据上述显示的磁场调节片的位置及个数,把磁场调节片配置在磁场发生装置上的步骤(e)。 Another aspect of the present invention to provide a method of adjusting the magnetic field, the magnetic field generating means for adjusting the gap of magnetic field generating means comprises a pair of plate-like configuration opposite yokes, and provided that one of each pair of plate yokes facing side of the permanent magnet, characterized in that the method comprises the following steps: Step a predetermined portion of said measuring gap magnetic field strength (a); storing the magnetic field when the flap means arranged at a predetermined position of the magnetic field generating step change amount ( b); based on the amount of change in magnetic field strength and the magnetic field, adjust the position of each of the magnetic sheet, the magnetic field to calculate the expected value of the configuration steps flap means at a predetermined position occurs when the magnetic field uniformity (c); the output of the magnetic field and a position adjustment step and the number of pieces of the magnetic field of the display, the flap arranged on the magnetic field generating means; uniformity expected minimum value of the magnetic field and the step of adjusting the position of the number of sheets (d) (e).

本发明的另一个方面是提供计算机可读取的记录媒体,用于记录程序,该程序用于调节磁场发生装置的空隙的磁场,该磁场发生装置包含相向配置的一对板状轭铁、以及设在该一对板状轭铁的各相向面侧的永久磁铁,其特征在于把以下步骤记录在由计算机执行的程序中:输入上述空隙的预定部位的磁场强度的步骤;存储将磁场调节片配置在磁场发生装置预定位置时的磁场变化量的步骤;根据上述磁场强度和磁场变化量,对每个磁场调节片的位置,计算将磁场调节片配置在磁场发生装置预定位置时的磁场均匀度的预想值的步骤;输出上述磁场均匀度的预想值为最小时的、磁场调节片的位置和个数的步骤。 Another aspect of the present invention to provide a computer-readable recording medium for recording a program which is used to adjust the magnetic field generating means of the gap, means comprising a pair of opposed plate-like configuration of the yoke magnetic field generator, and located in the opposite side of the pair of plate yokes of the permanent magnet, characterized by the following steps recorded in the program executed by the computer: Step input to the gap of a predetermined portion of the magnetic field strength; storing the magnetic flap When a magnetic field generating means a predetermined position of the magnetic field variation steps to configure; based on the amount of change in magnetic field strength and the magnetic field, the magnetic field for each position of the flap, flap configuration to calculate the magnetic field uniformity of the magnetic field device occurs at a predetermined position of the magnetic field the expected output of the magnetic field uniformity is minimum, the magnetic field flap position and the number of steps; steps expected values.

在本发明中,根据磁场发生装置的空隙的磁场强度、和把磁场调节片配置在磁场发生装置预定位置时的磁场变化量,例如用直接探索法,对每个磁场调节片位置算出磁场均匀度的预想值。 In the present invention, the magnetic field strength of the magnetic field generating means of voids, and the amount of the magnetic field variation flap configuration at a predetermined position when the magnetic field generating means, for example, direct heuristics, flap position is calculated for each of the magnetic field uniformity the expected value. 然后,选择并输出磁场均匀度的预想值为最小时的磁场调节片的位置及个数。 Then, select and output the expected value of the magnetic field uniformity of the magnetic field minimum flap position and number. 作业者只要根据该输出,将磁场调节片配置在磁场发生装置上即可,所以,可容易且高精度地调节磁场。 According to this operation as long as the output, the magnetic field is disposed on the flap magnetic field generating means can, therefore, can be easily and accurately adjusting the magnetic field.

为了算出磁场均匀度的预想值,优选判断配置在磁场发生装置上的磁场调节片的个数是否在上限值以下。 For calculating the expected value of the magnetic field uniformity, is determined preferably configured magnetic field generating means on the flap is in the upper limit number or less. 当磁场调节片的个数在上限值以下时,输出磁场均匀度的预想值为最小时的磁场调节片的位置及个数。 When the number of magnetic flap at the upper limit, the output value of the magnetic field uniformity expected minimum magnetic field to adjust the position and number of pieces. 这样,通过对配置的磁场调节片的个数设定上限值,可用更少的磁场调节片调节磁场,并不妨害倾斜磁场线圈。 Thus, the configuration of the magnetic field by adjusting the number of sheets set upper limit value, less available flap adjusting magnetic field, does not prejudice the gradient coil.

在上述发明中,优选在上述永久磁铁上设置硅钢板,上述磁场调节片配置在该硅钢板上。 In the above invention, preferably silicon steel sheet disposed on the permanent magnet, the magnetic field configuration in the flap silicon steel sheet. 这时,可减少每一个磁场调节片的磁场变化量,可容易地进行磁场微调节。 In this case, the magnetic field can reduce the amount of variation of each magnetic flap and micro-magnetic field can be easily adjusted.

另外,上述磁场调节片优选是磁铁。 Further, the magnetic field is preferably a magnet flap. 这时,可在正负两方向调节磁场,可更灵活地进行磁场的调节。 In this case, the magnetic field can be adjusted both in positive and negative direction, the magnetic field can be more flexibly adjusted.

本发明的上述目的和其它目的、特征和优点,在以下结合附图的实施例说明中将更加清楚。 The above object and other objects, features and advantages of the present invention, in the example of the implementation of the following description in conjunction with the drawings clearer.

附图说明 Brief Description

图1是表示本发明一实施例的图解图。 Figure 1 is a schematic diagram of an embodiment of the present invention.

图2A和图2B是表示磁场调节片的粘贴位置的图解图。 Figures 2A and 2B is a magnetic flap attaching position illustrated in FIG.

图3是表示本发明动作之一例的流程图。 Figure 3 is a flowchart showing an example of the present invention.

图4是表示继续图3动作的流程图。 FIG 4 is a flowchart showing the operation continuing from FIG 3.

图5是表示用直线探索法进行动作之一例的流程图。 FIG 5 is a flowchart showing an example of operation performed by a straight line heuristics.

图6A~图6D是表示用线形计画法计算例的图解图。 Figure 6A ~ Fig. 6D is a calculated example using a linear plan method illustrated in FIG.

图7A~图7D是表示用直接探索法计算例的图解图。 Figure 7A ~ 7D are showing an example of direct exploration calculated by graphic diagram.

图8A~8D是表示将用线形计画法和直接探索法组合计算例的图解图。 Figure 8A ~ 8D is a calculated example using a combination of direct exploration method and linear plan method illustrated in FIG.

具体实施方式 DETAILED DESCRIPTION

下面,参照附图说明本发明的实施例。 Referring to the drawings illustrate embodiments of the present invention.

如图1所示,本发明一实施例的磁场调节用装置10,例如用于调节MRI用磁场发生装置100的空隙102的磁场。 As shown in Figure 1, one embodiment of the invention the magnetic field of the adjustment means 10, for example, for adjusting the gap MRI magnetic field generating means 100 by 102.

磁场发生装置100,包含形成空隙102地相向配置的一对板状轭铁104a、104b。 Magnetic field generating means 100, 102 comprise voids disposed opposite to a pair of plate yokes 104a, 104b.

在板状轭铁104a和104b的各相向面侧,配置着永久磁铁组106a、106b,在永久磁铁106a、106b组的各相向面侧,固定着磁极板108a、108b。 In the plate-shaped yokes 104a and 104b of each of the opposing side, the configuration of the permanent magnet group 106a, 106b, the permanent magnets 106a, 106b of each set of opposing side, fixed pole plate 108a, 108b.

永久磁铁组106a、106b分别由R-Fe-B系烧结磁铁构成,例如是把边长为50mm的立方体状磁铁单体等重叠成三层而形成的。 The permanent magnet groups 106a, 106b, respectively, from the R-Fe-B sintered magnets, for example, the overlapping side length 50mm cube shaped magnet monomer formed into three layers. R-Fe-B系烧结磁铁在美国专利第4,770,723号中有记载。 R-Fe-B sintered magnets are described in U.S. Patent No. 4,770,723 in.

磁极板108a包含圆板状的基板110,该基板110由配置在永久磁铁组106a主面的铁构成。 Magnetic plates 108a contains a disk-shaped substrate 110, the substrate 110 by the configuration of the permanent magnet group 106a main surface iron. 在基板110的主面上,形成用于防止发生涡流的硅钢板112。 In the main surface of the substrate 110, forming silicon steel sheet 112 for preventing the occurrence of eddy currents. 硅钢板112用粘接剂固定在基板110上。 Silicon steel plate 112 fixed with an adhesive on the substrate 110. 在基板110的周缘部,形成例如由铁构成的、用于提高周缘部磁场强度的环状突起114。 In the periphery of the substrate 110 is formed, for example, for increasing the magnetic field strength of the peripheral edge portion of the annular projection 114 formed by the iron. 磁极板108b也同样。 Magnetic plates 108b also. 在由该环状突起114形成的内侧凹部内,配置着倾斜磁场线圈(未图示)。 Within the annular projection 114 is formed by the inner recess disposed gradient coil (not shown).

在板状轭铁104a和104b的中央,分别配置着磁场调节用的可动轭铁116a和116b。 In the center of the plate yoke 104a and 104b respectively arranged magnetic field adjustment by moving yoke 116a and 116b. 借助螺栓118,可动轭铁116a的上下方向位置被调节。 118 by means of bolts, vertically movable yoke 116a position is adjusted. 通过延长杆120的操作,可动轭铁116b的上下方向位置被调节。 By operating the extension rod 120, the position of the movable vertical direction yokes 116b is adjusted. 在板状轭铁104a和104b的相向面侧以及永久磁铁组106a、106b的外侧,分别安装着调节用螺栓122a、122b,另外,设有磁铁罩124a、124b。 Outside the plate-shaped yokes 104a and 104b and the side facing the permanent magnet groups 106a, 106b respectively mounted adjusting screws 122a, 122b, additionally, a magnet cover 124a, 124b. 板状轭铁104a与104b之间,由支承轭铁126磁性结合着,借助从板状轭铁104a上面螺入的间隙调节螺栓127,可调节板状轭铁104a与支承轭铁126之间的间隙。 Between the plate yokes 104a and 104b, by the support combined with the magnetic yoke 126, with the upper yoke 104a screwed into the gap adjusting bolt from the plate 127 can be adjusted between the plate yokes 104a and the support yoke 126 clearance. 由可动轭铁116a、116b、调节用螺栓122a、122b、间隙调节用螺栓127进行机械调节,这样,磁场被粗调节。 The movable yokes 116a, 116b, adjusting screws 122a, 122b, mechanically adjusting the gap adjusting bolt 127, so that the magnetic field is coarse adjusted.

在板状轭铁104b的下面安装着脚部128。 In the following plate yoke 104b is mounted 128 feet.

上述的磁场调节用装置10,用于调节该磁场发生装置100的空隙102的磁场。 Said magnetic field adjusting means 10 for adjusting the gap of the magnetic field generating means 100 of 102. 该磁场调节用装置10,包含例如个人电脑等的计算机12。 The magnetic field adjustment device 10 includes a personal computer, such as a computer 12. 计算机12包含控制计算12和磁场调节用装置10动作的CPU14、硬盘驱动器16、软盘驱动器18、CD-ROM驱动器19、存储不要变更的程序或数据等的ROM20、暂时存储计算数据等的RAM22、由键盘和鼠标等构成的输入部24、由显示器等构成的显示部26。 RAM22 ROM20 computer 12 includes a control calculation 12 and the magnetic field adjustment 10 is operated by means of the CPU14, the hard disk drive 16, a floppy disk drive 18, CD-ROM drive 19, a program memory do not change or the like of data, temporarily stores the calculated data and the like, by the input portion constituting keyboard and mouse, etc. 24, the display unit 26 by the display or the like. 在由硬盘驱动器16驱动的硬盘内,存储着供计算机12执行图3至图5动作所用的程序等。 A hard disk drive in the hard disk drive 16, stored for 3 to 5 executes the operation of the computer 12 used procedures.

另外,磁场调节用装置10,包含设置在磁场发生装置100的均匀空间F内的测头(NMR元件)28。 In addition, the magnetic field adjustment device 10 includes setting probe (NMR element) 28 F uniform space device 100 occurs within the magnetic field. 这里所说的“均匀空间”,是指磁场均匀程度为100ppm以下的磁场空间。 The term "uniform space" means a degree of uniformity of the magnetic field of the magnetic field space is 100ppm or less. 测头28由配置在磁板板108b上的定位装置30,定位在均匀空间F内的所需位置,根据来自测头28的测定数据,由磁力计32计测磁场强度,其值送到CPU14。 Probe 28 by the configuration on the magnetic plate board 108b positioning means 30, positioned within the homogeneous space F desired location, based on the measurement data from the probe 28 by 32 meter magnetometer measuring the magnetic field strength, and its value to the CPU14 . 磁场强度除了用NMR元件测定外,也可以用霍耳元件测定。 In addition to the magnetic field strength measured by NMR element, but also can be determined by a Hall element.

CPU14连接着温度控制装置34,温度控制装置34常时被计算机12监视。 When CPU14 is connected with the temperature control device 34, the temperature control apparatus 34 is often monitored by the computer 12. 温度控制装置34根据来自配置在磁场发生装置100内的温度传感器36的数据,控制加热器38。 Temperature control device 34 according to data from the temperature sensor configuration occurs when a magnetic field within the device 100, 36, controls the heater 38. 当磁场发生装置100的温度降低时,永久磁铁组106a、106b等的磁铁产生的磁通增多,磁场不稳定,不能正确地调节磁场,所以,用温度控制装置34控制设在磁场发生装置100内的加热器38,将磁场发生装置100的温度保持为一定。 When the temperature of the magnetic flux generated by magnetic field generating means 100 is lowered, the permanent magnet group 106a, 106b, etc. increase, unstable magnetic field, the magnetic field is not properly adjusted, so that the temperature control device 34 controls the magnetic field generating means disposed in 100 the heater 38, the temperature of the magnetic field generating means 100 is kept constant.

根据采用该磁场调节用装置10的计算结果,把磁铁构成的磁场调节片(下面称为调节片)40粘贴在硅钢板112上,被动地进行调节,磁场被微调节。 According to this magnetic field adjustment using the results of the calculation means 10, the magnetic field of the magnet flap (hereinafter referred to as flap) 40 attached to the silicon steel sheet 112, passively adjusted by fine adjustment of the magnetic field.

粘贴位置如图2A和图2B所示,将由环状突起114包围的硅钢板112上的区域,设定在每隔30进行分割的放射状线与从中心向外侧的同心圆的交点上。 Pasting position shown in Figures 2A and 2B, by the annular projection 112 on the region surrounded by the silicon steel sheet 114 is set at 30 intervals dividing the radial line from the center to the outside of the intersection of concentric circles. 具体地说,在上侧磁极板108a和下侧磁极板108b的各硅钢板112的主面上,分别如图2A和图2B所示,在径方向7个部位(磁极板108a上是U1~U7,在磁极板108b上是L1~L7)圆周方向12个部位(0~330)=84个部位,是粘贴位置。 Specifically, on the side of the main surface of each silicon steel sheet magnetic plates 108a and 108b of the lower side of the pole plate 112 as shown in Figures 2A and 2B, in the radial direction of the seven parts (pole plate 108a is U1 ~ U7, the pole plate 108b is L1 ~ L7) portion 12 in the circumferential direction (0 ~ 330 ) = 84 个 sites is the pasting position. 其余的部位,在出厂时粘贴了调节片,事前进行了磁场强度调节。 The remaining portion, at the factory pasted flap, the magnetic field intensity adjusted beforehand. 粘贴调节片时,并不是在设置场所加工所需大小的调节片,而是使用预先加工好的调节片。 Paste sheet adjustment is not in place to set the size of the flap required for processing, but the use of pre-machined flap. 所用的调节片40的尺寸,取决于粘贴位置,存储在计算机12内。 The size of flap 40 used, depending on the pasting position, the computer 12 is stored in. 具体地说,在U1、U2、L1、L2的位置,采用直径4mm的调节片40,在U3、U4、L3、L4的位置,采用直径7mm的调节片40,在U5~U7和L5~L7的位置,采用直径11mm的调节片40,这些调节片40分别是厚度为1mm的具有各向异性的圆板状钕烧结磁铁。 Specifically, U1, U2, L1, L2 of the position, diameter 4mm flap 40, at U3, U4, L3, L4 position, using 7mm diameter flap 40, the U5 ~ U7 and L5 ~ L7 position, diameter of 11mm flap 40, the flap 40, respectively, having a thickness of 1mm disk-shaped anisotropic neodymium sintered magnet.

下面,说明本说明书中所述的线形计画法的原理。 Next, to explain the principles described in this specification linear program method.

线形计画法,是在给定的条件下,使目的函数成为最大或最小的方法,是最适合的方法之一。 Linear Planning Act, under given conditions, so the objective function becomes maximum or minimum method is the most suitable method. 确定调节片40的位置和个数的方法的设定,可用下式表示。 Adjust the position and the number is set to determine a method of sheet 40, it can be expressed.

限制条件如式1所示。 Formula 1 as limitations.

(式1)-e/2≤a11x1+a12x2+a13x3+....+a1nxn+b1≤e/2-e/2≤a21x1+a22x2+a23x3+....+a2nxn+b2≤e/2……………………………………………………………………………………………………………………………………………………-e/2≤amlx1+am2x2+am3x3+....+amnxn+bm≤e/2-pa1≤x1≤pb1-pa2≤x2≤pb2-pa3≤x3≤pb3..................... (Formula 1) -e / 2≤a11 x1 + a12 x2 + a13 x3 + .... + a1n xn + b1≤e / 2-e / 2≤a21 x1 + a22 x2 + a23 x3 + .... + a2n xn + b2≤e / 2 ............................................................................................................ ............................................................ -e / 2≤aml x1 + am2 x2 + am3 x3 + .... + amn xn + bm≤e / 2 -pa1≤x1≤pb1-pa2≤x2≤pb2-pa3≤x3≤pb3 .....................

..................... .....................

-pan≤xn≤pbn -pan≤xn≤pbn

式中,m:磁场测定点的总数n:调节片的位置总数e:磁场均匀度的目标值bi:在磁场测定点的位置i的磁场强度aij:调节片j付与位置i的磁场的磁场变化量Xj:调节片的个数Pai:在位置j的可安装调节片数的下限Pbi:在位置j的可安装调节片数的上限用矩阵形式表示式1时,则为式2。 Wherein, m: total number of magnetic field measurement points n: the total number of positions flap e: target value of the magnetic field uniformity bi: magnetic field intensity at position i in a magnetic field measurement points aij: j flap imparting magnetic field change position i amount Xj: Number flap Pai: can be installed in the position j limit Pbi adjusted number of pieces: the upper limit position j can be mounted flap matrix form number 1 type, compared with type 2.

(式2)[-E/2]<[A][X]+[B]<[E/2][-Pa]≤[X]≤[Pb]在该限制条件下,决定式3所示的目的函数,求出将Z最小化的[X],是最适合的方法。 (Formula 2) [- E / 2] <[A] [X] + [B] <[E / 2] [- Pa] ≤ [X] ≤ [Pb] under the restrictions, the decision of formula 3 The purpose of the function is obtained that minimizes the Z [X], is the most suitable method.

(式3)x1+x2+x3+………+xn=z→minimize换言之,该方法是,在磁场分布[B]上付加调节片40,最终求出能得到磁场均匀度的目标值[E]的最小的[X]。 (Formula 3) x1 + x2 + x3 + ......... + xn = z → minimize other words, the process is in the magnetic field distribution [B] applied to payment flap 40, the final target value of the magnetic field can be obtained evenness [E] minimum [X]. 另外,对于[A]要事前通过计算、测定等保存矩阵,在计算时付与e。 Further, the [A] to advance by calculation, measurement, etc. matrix stored in the calculation and payment e.

该线形计画法中,从式2可知,因磁场均匀度的目标值e的付与方法的不同,调节片40的个数[X]而不同。 The linear planning method, from the type 2, the uniformity of the magnetic field due to the different target e pay and methods of regulating the number of sheet 40 [X] and different. 例如,为了得到非常高的磁场均匀度,选择e为小的值时,调节片40的个数有时就非常大。 For example, in order to obtain a very high magnetic field uniformity, choose e small value, adjusting the number of sheet 40 is sometimes very large. 因此,通常是一边看着调节片40的个数,一边适当选择e值。 So, usually watching adjust the number sheet 40, while suitably selected e value.

在线形计画法中,虽然调节片40的个数产生小数,但是与其它方法相比,其优点是,从原理上说调节片40的数目可以少。 Online shaped Planning Act, although the flap 40 to produce a decimal number, but compared with other methods, the advantage is that from the principle that the number of flap 40 can be small.

下面,说明本说明书中所述的直接探索法的原理。 Next, to explain the principles described in this specification direct exploration methods.

通常,放置调节片40的位置是预先决定的,假设在各位置各放置一个调节片40,利用[A][X]+[B]=[B′],推定放置调节片40后的磁场分布[B′],只选择磁场分布最佳的调节片40。 Typically, adjusting the position of sheet 40 is placed is determined in advance, it is assumed in the positions of the flap 40 is placed a by [A] [X] + [B] = [B '], estimated placed after adjusting the magnetic field distribution in sheet 40 [B '], selecting only the best of the magnetic field distribution flap 40. 接着,对[B′]反复同样的顺序,使[A][X]+[B′]成为最佳。 Next, the [B '] repeated the same order, so that [A] [X] + [B'] to be the best. 决定一个最适当的调节片40,选择该调节片40。 Determine a most appropriate flap 40, the flap 40 select. 接着反复该顺序,得到均匀性高的磁场。 The sequence is then repeated to obtain a highly uniform magnetic field. 当判断在任何位置的调节片40都没有提高磁场均匀性的效果时,结束计算。 When it is determined at any position of the flap 40 are not improving the uniformity of the magnetic field effect, the end of the calculation.

在直接探索法中,原理上不产生小数,所以,不需要数理计画法中的麻烦的处理(该处理是,把基于四舍五入后调节片数的磁场均匀度与目标值比较)可容易地提高磁场均匀度。 In the direct exploration method, no decimal principle, therefore, does not require mathematical planning method cumbersome process (this process is that the flap numbers are rounded and based on the magnetic field uniformity target comparison) can easily improve magnetic field uniformity.

另外,把线形计画法与直接探索法组合,可以用少的调节片40得到非常高的磁场均匀度。 In addition, the linear plan method of direct exploration methods in combination, you can use less of the flap 40 to get a very high magnetic field uniformity.

下面,参照图3至图5,说明采用磁场调节用装置10的磁场调节动作。 Referring to FIGS. 3 to 5, indicating the use of a magnetic field with a magnetic field-modulating action device 10.

磁场发生装置10例如到达医院等设置场所时,通过作业者(现场工程师)将计算机12设置在不受磁性影响的场所,由温度控制装置34将磁场发生装置100的温度保持一定,使中心磁场强度稳定。 Field generating device 10 is set to reach hospitals and other places, by the operator (site engineer) 12 is provided in place the computer from magnetic influence, the temperature control device 34 by the magnetic field temperature device 100 such as maintaining a certain occurrence, the central magnetic field strength stable.

为了知道中心磁场强度是否稳定,要进行以下的操作。 In order to know whether the center of the magnetic field strength and stability, to carry out the following operations.

首先判断是否已经过了预定时间(例如10分钟)(步骤S1)。 First determines whether a predetermined time has passed (for example, 10 minutes) (step S1). 在经过预定时间前待机,经过了预定时间时,中心磁场强度被读入RAM22(步骤S3)。 After a predetermined time before the standby, after a predetermined time, the center magnetic field strength is read into the RAM22 (step S3). 接着,比较前次和本次的中心磁场强度,判断其差是否在预定值(例如20ppm)以内(步骤S5)。 Next, compare the previous and the center of this magnetic field strength, it is judged whether or not a difference between a predetermined value (for example 20ppm) or less (step S5). 如果磁场强度差超过了预定值,返回步骤S1,反复上述的处理,一直到到达预定值以内。 If the magnetic field intensity difference exceeds a predetermined value, the process returns to step S1, repeating this process until the arrival within the predetermined value.

当磁场强度差到达预定值以内时,判断为中心磁场强度稳定,测定出调节用磁场强度。 When the magnetic field intensity difference reaches a predetermined value or less, it is determined that the center of the magnetic field strength and stability, measured magnetic field strength adjustment. 即,使测头28旋转、移动,用磁力计32测定均匀空间F的球体表面和内部130~180个部位的测定点的磁场强度,根据该测定值,计算磁场均匀度Z(步骤S7)。 That is, the measuring head 28 rotate, move, with a magnetometer measuring the magnetic field strength 32 F uniform space sphere surface and inside of 130 to 180 parts of the measurement point, based on the measured values, calculated magnetic field uniformity Z (step S7). 磁场强度的测定值和磁场均匀度Z被读入计算机12的RAM22(步骤S9)。 And the measured values of the magnetic field strength uniformity Z is read into the computer 12 RAM22 (step S9).

计算条件文件从硬盘驱动器16或软盘驱动器18被读入RAM22(步骤S11)。 Calculation condition file from the hard disk drive 16 or the floppy disk drive 18 is read into the RAM22 (step S11). 计算条件文件中,包含有关调节片40的数据库。 Calculation condition file contains information about the flap 40 database. 例如,磁极板108a和108b表面各粘贴位置的磁场变化量、即把调节片40配置在各粘贴位置上时的、均匀空间F表面各测定点的磁场变化量被读入。 For example, the amount of change in the magnetic field pole surfaces 108a and 108b of each plate attaching position, i.e., the flap 40 is disposed in the attaching position on time, the amount of change in a uniform magnetic field space F of the surface of each measurement point is read. 另外,磁场均匀度的规格Appm、判断是否执行线形计画法用的阈值Bppm、磁场均匀度的目标值e(I)等被读入。 In addition, the magnetic field uniformity specifications Appm, determines whether to perform a threshold Bppm linear program method used, the target value of the magnetic field uniformity e (I) and the like are read. 作为目标值e(I),满足e(1)>e(2)>…>e(N)的N个值被输入,I是l≤I≤N的整数。 As a target value e (I), satisfies e (1)> e (2)> ...> e (N) of the N values is input, I is an integer of l≤I≤N. 目标值e(I)<规格A<阈值B。 Target value e (I) <Specifications A <Threshold B. 另外,通常磁场均匀度的目标值e(I)越小,则修正越严格,需要多个调节片40,作业烦杂,所以,应比较并考虑磁场均匀度的精度和修正作业的麻烦,在此基础上设定磁场均匀度的目标值e(I)。 Further, the target value e (I) usually smaller magnetic field uniformity is corrected more stringent, requiring multiple flap 40, troublesome operations, it should be considered cumbersome and compare the accuracy and uniformity of the magnetic field correction operations, in this set on the basis of magnetic field uniformity target e (I). 另外,可粘贴的全部调节片40的上限值M(最大数)和可粘贴的每一个部位的调节片40的上限值P(最大数)被读入。 In addition, you can paste the whole flap upper limit of M 40 (the maximum) and can be attached to every part of the flap upper limit of P 40 (the maximum) are read into.

然后,求出目标值e(I)的最大值与最小值之差、即宽度Δd(步骤S13),判断是否进行了初次的被动调节、即以前是否由调节片40进行了磁场修正(步骤S15)。 Then, find the target e (I) of the difference between the maximum and minimum values, namely width Δd (step S13), determines whether the initial passive adjustment, whether formerly carried out by the flap magnetic field correction (step S15 40 ). 如果已经粘贴了调节片40时,要考虑其位置和数量。 If you have pasted the flap 40, to consider the position and quantity. 如果未进行初次的被动调节,则将已粘贴调节片40的位置、个数读入RAM22(步骤S17),进入图4所示的步骤S19。 If no initial passive adjustment, it has been pasted flap 40 position, the number of read RAM22 (step S17), proceeds to step S19 shown in Fig. 如果已进行了初次的被动调节,则直接进入步骤S19。 If you have made the initial passive adjustment, then go directly to step S19.

在步骤S19,比较该时刻的磁场均匀度Z与规格A、阈值B。 In step S19, the comparison of the uniformity of the magnetic moment and the specifications Z A, the threshold B.

如果Z≥B,作为Target=e(I)预先输入的N个目标值e(I)被设定(步骤S21),用上述的线形计画法,从大的目标值e(I)依次计算调节片40的位置和个数(步骤S23)。 If Z≥B, as Target = e (I) N previously entered target values e (I) is set (step S21), the linear program using the above method, from a large target e (I) followed by calculation Adjust the position and the number of sheet 40 (step S23). 这时,如果调节片40的个数是小数,则四舍五入使其成为整数。 In this case, if the number of flap 40 is the decimal, the rounding to become an integer. 然后,根据四舍五入后的调节片40的位置和个数,计算Target=e(I)的磁场均匀度的预想值(步骤S25)。 Then, after rounding according to the location and the number of flap 40, the calculation Target = e (I) The expected value of the magnetic field uniformity (step S25).

判断计算的结果是否是全部调节片数为M个以下且每一个部位的调节片数是否为P个以下(步骤S27)。 Judging whether the calculated result is all flap and a number of M or less per one flap portion is the P or less (step S27). 例如,设定为M=50,P=10。 For example, is set to M = 50, P = 10.

如果全部调节片数多于M个且一个部位的调节片数多于P个时,判断是否是I=1(步骤S29)。 If more than the number of all the M flap and a flap portion is more than the number of P, it is determined whether I = 1 (step S29). 如果I=1,则认为在该时刻设定的N个目标值e(I)一个也不满足,使e(I)=e(I)+Δd,加大目标值(步骤S31),返回步骤S21。 If I = 1, then a is not satisfied that the time set in the target value of N e (I), so that e (I) = e (I) + Δd, to increase the target value (step S31), returns to step S21. 如果I>1,则进入步骤S33。 If I> 1, the process proceeds to step S33.

另一方面,在步骤S27,如果全部调节片数在M个以下且一个部位的调节片数在P个以下时,其目标值e(I)时的调节片40的位置、个数及磁场均匀度的预想值被保存(步骤S35)。 On the other hand, in step S27, if the number of all flap and a flap portion in the number of M or less or less at P, whose target position adjusting sheet e (I) at 40, and the number of magnetic field uniformity the expected value of the degree is stored (step S35).

然后,判断是否是I=N(步骤S37)。 Then, it is determined whether I = N (step S37). 如果I不等于N,则使I=I+1,加大I(步骤S39),返回步骤S21。 If I is not equal to N, then make I = I + 1, to increase the I (step S39), returns to the step S21.

如果I=N,则对于该时刻设定的N个全目标值e(I)结束计算,各目标值e(I)的调节片40的位置、个数及磁场均匀度的预想值被保存。 If I = N, then the time for the full set of N target values e (I) the end of the calculation, the respective target values e (I) the expected value of the position of the flap, the number 40 and the magnetic field uniformity is preserved. 因此,这时,在I=1后(步骤S41),使e(I)=e(I)-Δd,减小目标值(步骤S43),返回步骤S21。 Thus, this case, I = 1 (step S41), so that e (I) = e (I) -Δd, reducing the target value (step S43), returns to the step S21.

这样处理后,在步骤S33,选择(调节片数)2+(磁场均匀度的预想值)2为最小的e(I)、即e(opt),设定Target=e(opt)。 After this treatment, in step S33, the selection (adjustment Disc) 2+ (expected value of magnetic field uniformity) 2 is minimum e (I), i.e., e (opt), setting Target = e (opt). 这样从对于目标值e(I)的解中,选择最适当的解,用少的调节片40改善磁场均匀度,提高调节精度。 Thus from the target e (I) solution, select the most appropriate solutions to improve the uniformity of the magnetic field with a small flap 40, to improve regulation accuracy.

选择的Target=e(opt)时的调节片40的位置、个数和磁场均匀度的预想值被决定,这时的均匀空间F表面各测定点的磁场强度的预想值被读入RAM22(步骤S45)。 Selected flap Target = e (opt) when the position of the expected value of the number of magnetic field uniformity and 40 is determined, the expected value of the spatial magnetic field intensity uniform surface F at this time each measurement point is read into the RAM22 (step S45).

判断该磁场均匀度的预想值是否在规格A以下(步骤S47),如果磁场均匀度的预想值在规格A以下,其结果由计算机12的显示部26显示(步骤S51)后结束。 The uniformity of the magnetic field is determined whether the value of the expected size A or less (step S47), if the expected value of the magnetic field uniformity in standard A or less, the results by the display unit 26 of the computer 12 is displayed (step S51) after. 另一方面,如果磁场均匀度的预想值大于规格A,则执行图5所示的直接探索法(步骤S49),其结果由计算机12的显示部26显示(步骤S51)后结束。 On the other hand, if the expected value of the magnetic field uniformity of size greater than A, then executes the direct exploration method (step S49) 5 as shown, the result is displayed by the display unit 26 of the computer 12 (step S51) after. 这时,显示部26上显示如图6A~图6D、图7A~图7D、图8A~图8D所示那样的调节数据。 At this time, the display on the display unit 26 as shown in FIG. 6A ~ 6D, FIG. 7A ~ Figure 7D, Figure 8A ~ adjustment data as shown in FIG. 8D. 作业者只要根据该显示把调节片40配置在硅钢板112上即可,可容易且高精度地调节磁场。 As long as the operator according to the display of the flap 40 is disposed on the silicon steel sheet 112 can be easily and accurately adjusting the magnetic field.

在步骤S19,如果磁场均匀度Z大于规格A而不足阈值B时,不执行线形计画法的计算,直接进入步骤S49。 In step S19, if the magnetic field uniformity Z is greater than A and smaller than the threshold size B, it does not perform the calculation method of the linear program directly proceeds to step S49. 如果磁场均匀度Z在规格A以下,则就此结束。 If the magnetic field uniformity Z in the specifications A or less, the end.

下面,参照图5说明直接探索法的执行。 Referring to FIG. 5 instructions direct exploration methods.

先把1个调节片40配置在某位置(例如径向L1、角度0的位置)(步骤S101),参照数据库,计算这时的均匀空间F各测定点的磁场变化量(步骤S103)。 A first flap 40 is disposed at a position (e.g. radial L1, the angle 0 position) (step S101), referring to the database, then the calculated amount of change in a uniform magnetic field space F of each measurement point (step S103).

接着,把在步骤103计算得到的磁场变化量,加在已读入的各测定点的磁场强度上(步骤S105)。 Next, the magnetic field changes the amount calculated in step 103 was added in the magnetic field strength has read each measurement point (step S105). 这里,磁场变化量这样加算:不执行线形计画法的计算时,加在步骤S29读入的磁场强度上,执行线形计画法的计算时,加在步骤S45读入的磁场强度预想值上。 Here, the magnetic field variation of such an addition: do not perform the calculation method of linear program, added to the step S29 reads the magnetic field strength, when performing the calculation method of the linear program, added to the step S45 to read the magnetic field strength of the expected value of the .

接着,根据步骤S105的计算结果,计算磁场均匀度的预想值,调节片40的位置、个数一起存储在RAM22内(步骤S107)。 Then, according to the calculation result in step S105, the expected value of the calculated magnetic field uniformity, adjust the position of the sheet 40, together with the number stored in the RAM22 (step S107).

看调节片40是否已配置在图2所示的全部粘贴位置上,即,判断对各位置是否已计算完了修正后数据(步骤S109)。 Look flap 40 has been configured in all pasting position shown in Figure 2, that is, it is determined whether each location has been calculated over the corrected data (step S109). 如果对全部粘贴位置(径向L1、角度0~径向U7、角度330的位置)未计算完修正后数据,则把调节片40配置在未执行计算的位置,执行同样的计算。 If the same calculation for all the attaching position (radial L1, the radial angle of 0 ~ U7, the position angle of 330 ) is not completely corrected data calculating, put the flap 40 is disposed in the position calculation is not executed, execution. 如果对全部粘贴位置计算了修正后数据,则判断全部调节片是否为M个以下且一个部位的调节片数是否为P个以下(步骤S111)。 If all of the attaching position of the corrected data is calculated, it is determined whether all of flap M or less and a portion of the flap is the number of P or less (step S111).

只有在全部调节片数为M个以下且一个部位的调节片数为P个以下时,才返回步骤S101,或者再把1个调节片40配置在某个位置上后,反复上述直接探索法的计算。 When P or less, before returning to step S101, the or then a flap 40 is disposed at a position after repeatedly said that only direct exploration method in all the number of flap flap M or less and the number one position for the calculations.

如果全部调节片数超过M个或一个部位的调节片数超过P个时,从计算值(该计算值是调节片从该时刻减少1个前的计算值)中,选择磁场均匀度的预想值为最小的调节片40的位置和个数(步骤S113),这时的磁场均匀度的预想值被决定(步骤S115)。 If M exceeds all flap or a flap portion P number is exceeded, from the calculated value (the calculated value is adjusted to reduce the calculated values a sheet from the time before), select the desired value of the magnetic field uniformity The flap 40 is minimized and the number of the position (step S113), then the expected value of the magnetic field uniformity is determined (step S115). 然后,进入图4的步骤S51,由显示部26显示包含调节片40的位置和个数等的调节数据,然后结束。 Then, into the FIG step S51 4 by the display unit 26 displays a flap 40 and the number of such position adjustment data, and then ends.

这样,通过配置1个以上的调节片40,观察对空隙102中的磁场的影响,选择使磁场均匀性最高的调节片40的位置和个数。 Thus, by configuring one or more of the flap 40, to observe the impact of the gap 102 in the magnetic field, the magnetic field uniformity select the highest position and the flap 40 in number. 用该方法,可减少测定反复次数,可在短时间内提高磁场均匀度。 With this method, measurement can reduce the number of iterations, the magnetic field uniformity can be improved in a short time.

另外,通过对配置的调节片40的个数设定上限,可用更少的调节片40调节磁场。 Further, the number of configuration setting upper flap 40, flap 40 can be used with less magnetic field adjustment.

另外,由于调节片40配置在硅钢板112上,所以,可减少每一个调节片的磁场变化量,可容易地进行磁场的微调节。 Furthermore, since the flap 40 is disposed on the silicon steel sheet 112, so that the magnetic field can reduce the amount of variation of each flap can be easily fine adjustment of the magnetic field.

另外,由于调节片40是磁铁,所以,可以在正负两方向调节磁场,可更灵活地调节磁场。 Furthermore, since the flap 40 is a magnet, it is possible to adjust the magnetic field in the positive and negative directions, the magnetic field can be more flexibly adjusted.

图6A~图6D、图7A~图7D、图8A~图8D表示由显示部26显示的调节数据(计算结果)的一例。 Figure 6A ~ FIG. 6D, FIG. 7A ~ Figure 7D, Figure 8A ~ 8D shows the display unit 26 displays the adjustment data (calculation result) of the one case.

图6A~图6D表示用线形计画法(LP)的调节数据。 Figure 6A ~ 6D shows a linear program by method (LP) adjustment data. 图7A~图7B表示用直接探索法(DS)的调节数据。 Figure 7A ~ 7B shows a direct heuristics (DS) adjustment data. 图8A~图8D表示将线形计画法和直接探索法组合起来(LP+DS)时的调节数据。 Figure 8A ~ 8D shows adjustment data to combine (LP + DS) plan and direct linear time heuristics.

图6A、图7A、图8A中,Measured homogeneity in PPM是表示修正前现状的磁场均匀度(这里是45.1ppm),Calculated PPM(LPUnrounded)是表示四舍五入前的线形计画法得到的磁场均匀度的预想值。 Figures 6A, FIG. 7A, 8A,, Measured homogeneity in PPM is a status quo before the correction magnetic field uniformity (here 45.1ppm), Calculated PPM (LPUnrounded) is a linear planning method before rounding the resulting magnetic field uniformity the expected value. Calculated PPM(LP Rounded)是表示四舍五入后的线形计画法得到的磁场均匀度的预想值。 Calculated PPM (LP Rounded) is rounded forecast values represent a linear plan method by the magnetic field uniformity. Calculated PPM(DS added)是表示用直接探索法得到的磁场均匀度的预想值。 Calculated PPM (DS added) is the expected value obtained by the direct method to explore the magnetic field uniformity. 磁场均匀度用(磁场强度的最大值-磁场强度的最小值)106/(中心磁场强度或平均磁场强度)求得,其值越小,表示磁场均匀性越高。 Uniformity of magnetic field with (the maximum field strength - the minimum field strength) 106 / (center magnetic field strength or the average magnetic field strength) is obtained, the smaller the value, the higher the magnetic field uniformity.

图6B、图7B、图8B的表中,表示了调节片40(表示为“Shim”)的大小、调节片40的粘贴位置、粘贴在各位置的调节片40的个数(Delta)和过去粘贴的调节片40的个数(current)的合计(Total)等。 FIG. 6B, FIG. 7B, FIG. 8B table, showing the flap 40 (indicated as "Shim") size, adjusting the attaching position of sheet 40, attached to the flap 40 at each position number (Delta) and past Paste the flap 40 the number of (current) total (Total) and the like. 另外,如果调节片40的个数是小数值时,则四舍五入为整数,整数化的值表示在图6B、图7B、图8B的表中。 Further, if the number of adjusting sheet 40 is a small value, then rounded to an integer, the integer representation of the value in FIG. 6B, FIG. 7B, FIG. 8B table.

图6C、图7C、图8C的表中,表示在上部磁极板108a的每个粘贴位置,调节片40的四舍五入前的个数。 FIG. 6C, FIG. 7C, 8C chart, the upper part represents at each attaching position of the magnetic pole plate 108a, adjust the number of sheet 40 before rounding. 图6D、图7D、图8D的表中,表示在下部磁极板108b的每个粘贴位置,调节片40的四舍五入前的个数。 FIG. 6D, FIG. 7D, 8D in chart, showing the lower portion of each pole plate attaching position 108b, the adjustment of the number of sheet 40 before rounding. 其中的负值是表示磁力方向与磁场发生装置10中发生的磁通相反地(相斥方向)粘贴调节片40。 Wherein the negative direction of the magnetic field is a magnetic flux occurs contrary (repulsion direction) generating apparatus 10 of the flap 40 attached.

从图6A至图6D可知,预先设定目标值,采用线形计画法进行计算,可用少的调节片40调节磁场,可以将磁场均匀度的预想值减小到35.8ppm。 From Figures 6A to 6D shows that a preset target value is calculated using a linear program method, less available magnetic adjustment flap 40, the expected value of the magnetic field uniformity can be reduced to 35.8ppm.

从图7A至图7D可知,采用直接探索法进行计算,可将磁场均匀度的预想值减小到41.4ppm。 From 7A to 7D shows that were calculated using the direct heuristics can be expected to reduce the value of the magnetic field uniformity to 41.4ppm.

从图8A至图8D可知,将线形计画法和直接探索法组合起来,可用比单独采用直接探索法时少的调节片数,更有效地进行磁场调节,可把磁场均匀度的预想值减小到26.1ppm。 From 8A to 8D shows that combine linear plan and direct exploration method that can be used to explore the direct method than individual flap number, more effective magnetic field adjustment is small, the magnetic field uniformity can be expected decrements small to 26.1ppm.

这样,采用数种大小的调节片40,可以高精度地调节磁场。 Thus, the use of several sizes flap 40, the magnetic field can be accurately adjusted.

本发明,对于磁场发生装置10那样的在运输途中磁场均匀度容易不稳定的开放型装置尤为有效。 The present invention, the magnetic field generating means 10 as the magnetic field uniformity in transit readily volatile open type apparatus is particularly effective. 在本说明书中,所谓的开放型装置,是指具有连续150度以上开放部的磁场发生装置。 In the present specification, the so-called open-type device, refers to a continuous magnetic field has more than 150 open portion of the generator.

图6C、图6D、图7C、图7D、图8C和图8D中,为了便于说明,用小数表示调节片的数目,但为了使作业者更容易明白,也可以用“N”或“S”的极性表示,或者用颜色区分来识别表示。 Fig. 6C, FIG. 6D, Fig. 7C, Fig. 7D, 8C and 8D, for ease of explanation, the number of flap decimal representation, but in order to make the job easier to understand, you can use the "N" or "S" The polar representation, or use color-coded to identify the representation. 计算结果可以用打印机打印出来,也可以用任意的手段输出。 The results can be printed out by a printer can also be output by any means.

另外,也可以由作业者选择线形计画法、直接探索法、或线形计画法+直接探索法之中的任一方法,进行磁场调节。 Alternatively, you can select from the operator linear plan, direct heuristics, or linear plan method and direct exploration method among any of the methods, magnetic field adjustment.

上述实施例的动作中,是用粘贴在磁极板108a、108b上的调节片40进行磁场调节,但是,更大的磁场调节、例如也可用可动轭铁116a、116b、调节用螺栓122a、122b、间隙调节螺栓127进行磁场调节。 Operation of the above-described embodiments, is attached to the pole plate 108a, 108b flap 40 on the magnetic field adjustment, however, a greater magnetic field regulator, for example, also be movable yokes 116a, 116b, adjusting screws 122a, 122b gap adjustment magnetic field adjusting bolt 127.

另外,上述实施例中,是把调节片40直接粘贴在硅钢板112上,但本发明中,也可以在现场设置与硅钢板112分开的调节专用的磁场调节板(被动板)(在美国专利第6,275,128 B1号中揭示),把调节片40粘贴在该调节板上。 Further, the above-described embodiments, the flap 40 is directly attached to the silicon steel sheet 112, but the present invention may be provided in the field and the silicon steel sheet 112 separate dedicated field adjustment damper (passive board) (in U.S. Patent No. 6,275,128 B1 discloses the first), the flap 40 attached to the adjustment plate.

另外,用于执行图3至图5所示动作的程序,也可以存储在软盘或CD-ROM中,这时,可借助软盘驱动器18或CD-ROM驱动器19,通过计算机12利用,另外还可以通过互联网等下载,通过计算机12利用。 Further, the program operation shown in FIG. 3 to 5 for performing the map, may be stored in a floppy disk or CD-ROM in this case, it can make use of a floppy disk drive 18 or CD-ROM drive 19, the computer 12 by use of, also can Through the Internet, download, use by the computer 12.

上面详细说明了本发明,但上述仅为一例,本发明并不限于上述例,本发明的精神和范围仅由本申请的权利要求书限定。 The above detailed description of the present invention, the above is only an example, the present invention is not limited to the above example, the spirit and scope of the invention claimed in the present application only by the claims.

Classifications
International ClassificationG01R33/3873
Cooperative ClassificationG01R33/3873
European ClassificationG01R33/3873
Legal Events
DateCodeEventDescription
27 Feb 2002C10Request of examination as to substance
8 May 2002C06Publication
20 Apr 2005C14Granted