CA2398689A1 - Inductive proximity sensor for detecting ferromagnetic, non-permeable or magnet targets - Google Patents
Inductive proximity sensor for detecting ferromagnetic, non-permeable or magnet targets Download PDFInfo
- Publication number
- CA2398689A1 CA2398689A1 CA002398689A CA2398689A CA2398689A1 CA 2398689 A1 CA2398689 A1 CA 2398689A1 CA 002398689 A CA002398689 A CA 002398689A CA 2398689 A CA2398689 A CA 2398689A CA 2398689 A1 CA2398689 A1 CA 2398689A1
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- CA
- Canada
- Prior art keywords
- core
- proximity sensor
- central part
- inches
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/9401—Calibration techniques
- H03K2217/94021—Calibration techniques with human activation, e.g. processes requiring or being triggered by human intervention, user-input of digital word or analog voltage
Abstract
A core (120; 120'; or 1220) of a proximity sensor (100; 1200; or 1500) is made of a highly permeable metal and is shaped and sized to operate as a saturable core proximity sensor, a variable reluctance proximity sensor, and an eddy current proximity sensor. The core (120; 120'; or 1220) has a cross-sectional shape including a head portion (220 or 1231), two legs (222 or 1232) extending from the head portion (220 or 1231), and two foot portions (224 or 1233) (feet) extending from the two legs (222 or 1232). The head portion (220 or 1231) forms a substantially planar section along the upper surface and is perpendicular to the sectional direction created by the two legs (222 or 1232). The sectional direction of the two legs (222 or 1232) are perpendicular to the sectional direction of the two feet (224 or 1233). The two feet (224 or 1233) are in a common plane along the bottom surface.
Both foot portions are also parallel to the head portion. The cross-sectional shape of the core may further comprise two tail portions (1234) (tails), wherein each tail extends from one of the two foot (1233) portions in a direction toward the upper surface (1221).
Both foot portions are also parallel to the head portion. The cross-sectional shape of the core may further comprise two tail portions (1234) (tails), wherein each tail extends from one of the two foot (1233) portions in a direction toward the upper surface (1221).
Claims (57)
1. A proximity sensor, comprising:
a core having a section including a central part, two foot portions on opposite sides of the central part and two legs each extending between one of the foot portions and the central part, wherein the two legs are positioned on opposite sides of the central part;
a first sensing coil positioned around core; and a circuit coupled to the first sensing coil for sensing an object located in a sensing region adjacent to the core, wherein the core and circuit are configured and arranged to detect the presence of ferromagnetic, non-permeable and magnet targets.
a core having a section including a central part, two foot portions on opposite sides of the central part and two legs each extending between one of the foot portions and the central part, wherein the two legs are positioned on opposite sides of the central part;
a first sensing coil positioned around core; and a circuit coupled to the first sensing coil for sensing an object located in a sensing region adjacent to the core, wherein the core and circuit are configured and arranged to detect the presence of ferromagnetic, non-permeable and magnet targets.
2. The proximity sensor of Claim 1, wherein the legs are elongated and extend transversely of the central part and the foot portions.
3. The proximity sensor of Claim 1, further comprising a second sensing coil positioned around the core, wherein the first and second sensing coils have turns wrapped around the legs.
4. The proximity sensor of Claim 3, wherein the circuit also energizes the sensing coil to create the sensing region of the core.
5. The proximity sensor of Claim 1, wherein the circuit includes an oscillator for energizing the sensing coil to create the sensing region.
6. The proximity sensor of Claim 5, wherein the oscillator includes an eddy current kill oscillator circuit.
7. The proximity sensor of Claim 5, wherein the oscillator includes an eddy current loss all metal sensor circuit.
8. The proximity sensor of Claim 1, wherein the core is made of a permeable material.
9. The proximity sensor of Claim 1, wherein the core is constructed from a substantially rectangular member having a plurality of substantially rectangular surfaces forming the central part, foot portions and legs, each defining a plane, the plane of the central part being substantially perpendicular to the plane of each of the legs, the plane of the central part being substantially parallel to the plane of each of the foot portions, the first and second foot portions being adjacent to the first and second legs, respectively.
10. The proximity sensor of Claim 8, wherein the width of the central part of the core is greater than the width of the two leg portions and the foot portions.
11. The proximity sensor of Claim 1, wherein the core has a thickness of approximately 0.020 inches.
12. The proximity sensor of Claim 1, wherein the central part of the core has a width of approximately 0.370 inches and a length of approximately 0.390 inches.
13. The proximity sensor of Claim 1, wherein the legs have a first width adjacent to the central part and a second width, different from the first width, remote from the central part.
14. The proximity sensor of Claim 1, wherein the leg portions have a length of approximately 0.300 inches, a first width of approximately 0.370 inches extending approximately 0.050 inches from the central part, and a second width of approximately 0.292 inches extending approximately 0.250 inches beyond the first width.
15. The proximity sensor of Claim 1, further comprising a housing supporting the sensing coil and the core.
16. The proximity sensor of Claim1, in which the central portion of the core includes a calibration bolt.
17. The proximity sensor of Claim 16, wherein the calibration bolt is made of a highly permeable material.
18. The proximity sensor of Claim 16, wherein the calibration bolt is made of a material selected from the group consisting of soft iron; cast iron, and transformer steel.
19. The proximity sensor of Claim 16, wherein the calibration bolt is made of a material having a relative permeability equal to or greater than 90.
20. The proximity sensor of Claim 16, wherein the position of the calibration bolt relative to the remainder of the central part is adjustable to change a level of inductance that is measured from the first sensing coil positioned around core.
21. The proximity sensor of Claim 16, wherein the calibration bolt is a threaded screw.
22. The proximity sensor of Claim 1, wherein the cross-sectional shape of the core further comprises two tail portions, wherein each tail portion extend from an outer edge of one of the two foot portions, and wherein the tail portions are perpendicular to two foot portions.
23. The proximity sensor of Claim 1, wherein the head portion forms a substantially planar upper surface of the core and is perpendicular to the direction created by each of the two leg portions, the direction of the two leg portions being perpendicular to the direction of the two foot portions, the two foot portions lying in a common bottom surface plane, and wherein the two leg portions form an annular groove in the core that opens along side the upper surface of the core.
24. A core for use in a proximity sensor, wherein the core comprises a section of omega shape having a central part, two foot portions on opposite sides of the central part and two legs portions each extending between one of the foot portions and the central part, wherein the core is made from a highly permeable material.
25. The core of Claim 24, wherein the leg portions are elongated and extend transversely of the central part and the foot portions.
26. The core of Claim 24, wherein the core is constructed from a substantially rectangular member having a plurality of substantially rectangular surfaces forming the central part, foot portions and legs, each defining a plane, the plane of the central part being substantially perpendicular to the plane of each of the legs, the plane of the central part being substantially parallel to the plane of each of the foot portions, the first and second foot portions being adjacent to the first and second legs, respectively.
27. The core of Claim 24, wherein the core has a thickness of approximately 0.020 inches.
28. The core of Claim 24, wherein the central part of the core has a width of approximate by 0.370 inches and a length approximate to 0.390 inches.
29. The core of Claim 24, wherein the legs have a first width adjacent to the central part and a second width, different from the first width, remote from the central part.
30. The core of Claim 24, wherein the leg portions have a length of approximately 0.300 inches, a first width of approximately 0.370 inches extending approximately 0.050 inches from the central part, and a second width of approximately 0.292 inches extending approximately 0.250 inches beyond the first width.
31. The core of Claim 24, wherein the width of the central part is greater than the width of the leg portions and the foot portions.
32. The core of Claim 24, in which the central part of the core includes a calibration bolt positioned therethrough.
33. The proximity sensor of Claim 24, wherein the cross-sectional shape of the core further comprises two tail portions, wherein each tail portion extend from an outer edge of one of the two foot portions, and wherein the tail portions are perpendicular to two foot portions.
34. The core of Claim 24, wherein the central part forms a substantially planar upper surface of the core and is perpendicular to the direction created by each of the two leg portions, the direction of the two leg portions being perpendicular to the direction of the two foot portions, the two foot portions lying in a common bottom surface plane, and wherein the two leg portions define a surface that forms an annular groove in the core that opens from the upper surface of the core.
35. The proximity sensor of Claim 1, further comprising:
a calibration bolt positioned through an aperture in the central part of the core, wherein the calibration bolt is operatively associated with the first sensing coil and the core such that the calibration bolt influences an electric signal measured from the first sensing coil.
a calibration bolt positioned through an aperture in the central part of the core, wherein the calibration bolt is operatively associated with the first sensing coil and the core such that the calibration bolt influences an electric signal measured from the first sensing coil.
36. The proximity sensor of Claim 35, wherein the calibration bolt is made of a highly permeable material.
37. The proximity sensor of Claim 35, wherein the calibration bolt is made of a material selected from the group consisting of soft iron, cast iron, and transformer steel.
38. The proximity sensor of Claim 35, wherein the calibration bolt is made of a material having a relative permeability equal to or greater than 90.
39. The proximity sensor of Claim 35, wherein the position of the calibration bolt relative to the central part is adjustable to change a level of inductance that is measured from the first sensing coil positioned around core.
40. The proximity sensor of Claim 35, wherein the calibration bolt is a threaded screw.
41. The proximity sensor of Claim 35, further comprising circuitry coupled to the sensing coil, for sensing an object located in a sensing region adjacent to the core.
42. The proximity sensor of Claim 41, wherein the circuitry also energizes the sensing coil to create the sensing region of the core.
43. The proximity sensor of Claim 35, wherein the core has a thickness of approximately 0.020 inches.
44. The proximity sensor of Claim 35, wherein the legs have a first width adjacent to the central part and a second width, different from the first width, remote from the central part.
45. The proximity sensor of Claim 35, wherein the legs have a length of approximately 0.300 inches, a first width of approximately 0.370 inches extending approximately 0.050 inches from the , central part, and a second width of approximately 0.292 inches extending approximately 0.250 inches beyond the first width.
46. A proximity sensor, comprising:
a member having a top surface, a bottom surface, and a side surface having a width between the top and the bottom surfaces of the member, wherein the top surface is generally planar, and wherein the member defines a cavity that extends into the member from the top surface, wherein a section of the member includes a central part along the top surface of the member, two foot positions on opposite sides of the central part and two legs, wherein each of the two legs extend between the central part and one foot portion, wherein the foot portions and legs respectively form the bottom surface and the inner surface of the cavity, wherein the top and the bottom surfaces have a thickness less than or equal to 0.06 inches, and wherein the member is made from a highly permeable material;
a sensing coil positioned in the cavity for allowing magnetic flux communication between the sensing coil and the core; and a.circuit coupled to the sensing coil for sensing an object located in a sensing region adjacent to the member, wherein the member and the circuit are configured and arranged to detect the presence of ferromagnetic, non-permeable and magnetic targets.
a member having a top surface, a bottom surface, and a side surface having a width between the top and the bottom surfaces of the member, wherein the top surface is generally planar, and wherein the member defines a cavity that extends into the member from the top surface, wherein a section of the member includes a central part along the top surface of the member, two foot positions on opposite sides of the central part and two legs, wherein each of the two legs extend between the central part and one foot portion, wherein the foot portions and legs respectively form the bottom surface and the inner surface of the cavity, wherein the top and the bottom surfaces have a thickness less than or equal to 0.06 inches, and wherein the member is made from a highly permeable material;
a sensing coil positioned in the cavity for allowing magnetic flux communication between the sensing coil and the core; and a.circuit coupled to the sensing coil for sensing an object located in a sensing region adjacent to the member, wherein the member and the circuit are configured and arranged to detect the presence of ferromagnetic, non-permeable and magnetic targets.
47. The proximity sensor of Claim 46, wherein the top and the bottom surfaces of the member have a thickness less than 0.06 inches and greater than or equal to 0.005 inches.
48. The proximity sensor of Clam 46, wherein the member is constructed from a permeable material.
49. The proximity sensor of Claim 46, wherein the member is generally cylindrical in shape.
50. The proximity sensor of Claim 46, wherein the width of the member is in the range of 0.2 to 5 inches.
51. The proximity sensor of Claim 46, wherein the top surface is spaced radially outwardly of the outer perimeter of the member.
52. A method for detecting the presence of an object which comprises:
providing a core having a section of omega shape including a central part, two foot portions on opposite sides of the central part and two legs each extending between one of the foot portions and the central part;
providing at least one sensing coil positioned around the core; and measuring the inductance over the sensing coil, and if the inductance varies over a predetermined range, generating a signal to indicate the presence of the object.
providing a core having a section of omega shape including a central part, two foot portions on opposite sides of the central part and two legs each extending between one of the foot portions and the central part;
providing at least one sensing coil positioned around the core; and measuring the inductance over the sensing coil, and if the inductance varies over a predetermined range, generating a signal to indicate the presence of the object.
53. The method of Claim 52, wherein the leg portions are elongated and extend transversely of the central part and the foot portions.
54. The method .of Claim 52, further comprising providing a second sensing coil positioned around the core.
55. The method of Claim 52, wherein the object comprises a magnetic .
material.
material.
56. The method of Claim 52, wherein the object comprises a ferromagnetic material.
57. The method of Claim 52, wherein the object comprises a conductive material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/515,557 US6424145B1 (en) | 2000-02-29 | 2000-02-29 | Inductive proximity sensor for detecting ferromagnetic, non-permeable or magnet targets |
| US09/515,557 | 2000-02-29 | ||
| PCT/US2001/006522 WO2001065695A2 (en) | 2000-02-29 | 2001-02-28 | Inductive proximity sensor for detecting ferromagnetic, non-permeable or magnet targets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2398689A1 true CA2398689A1 (en) | 2001-09-07 |
| CA2398689C CA2398689C (en) | 2010-10-19 |
Family
ID=24051821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2398689A Expired - Lifetime CA2398689C (en) | 2000-02-29 | 2001-02-28 | Inductive proximity sensor for detecting ferromagnetic, non-permeable or magnet targets |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US6424145B1 (en) |
| EP (1) | EP1264404B1 (en) |
| AT (1) | ATE248461T1 (en) |
| AU (1) | AU2001239963A1 (en) |
| CA (1) | CA2398689C (en) |
| DE (1) | DE60100669T2 (en) |
| WO (1) | WO2001065695A2 (en) |
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| US5793204A (en) * | 1993-10-29 | 1998-08-11 | Logue; Delmar L. | Method or generating a rotating elliptical sensing pattern |
| DE4427220C2 (en) | 1994-08-01 | 1997-12-04 | Siemens Ag | Magnetic proximity detector |
| US5801530A (en) | 1995-04-17 | 1998-09-01 | Namco Controls Corporation | Proximity sensor having a non-ferrous metal shield for enhanced sensing range |
| US5801340A (en) | 1995-06-29 | 1998-09-01 | Invotronics Manufacturing | Proximity sensor |
| FR2738643B1 (en) | 1995-09-08 | 1997-12-26 | Schneider Electric Sa | UNIVERSAL INDUCTIVE PROXIMITY DETECTOR |
| US6002251A (en) * | 1995-12-15 | 1999-12-14 | Sun; Yu-Shi | Electromagnetic-field-focusing remote-field eddy-current probe system and method for inspecting anomalies in conducting plates |
| US5712621A (en) | 1996-06-06 | 1998-01-27 | Andersen; James D. | Security system with variable inductance sensor |
| US5814986A (en) * | 1997-03-18 | 1998-09-29 | Eaton Corporation | Coil retainer/positioner for inductive proximity sensor |
| US6094118A (en) * | 1997-12-09 | 2000-07-25 | Siemens Automotive Corporation | Electromagnetic actuator with stamped steel housing |
-
2000
- 2000-02-29 US US09/515,557 patent/US6424145B1/en not_active Expired - Lifetime
-
2001
- 2001-02-28 AU AU2001239963A patent/AU2001239963A1/en not_active Abandoned
- 2001-02-28 EP EP01914594A patent/EP1264404B1/en not_active Revoked
- 2001-02-28 DE DE60100669T patent/DE60100669T2/en not_active Revoked
- 2001-02-28 US US09/796,325 patent/US6507189B2/en not_active Expired - Lifetime
- 2001-02-28 AT AT01914594T patent/ATE248461T1/en not_active IP Right Cessation
- 2001-02-28 CA CA2398689A patent/CA2398689C/en not_active Expired - Lifetime
- 2001-02-28 WO PCT/US2001/006522 patent/WO2001065695A2/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| AU2001239963A1 (en) | 2001-09-12 |
| US6424145B1 (en) | 2002-07-23 |
| EP1264404B1 (en) | 2003-08-27 |
| US20010019262A1 (en) | 2001-09-06 |
| WO2001065695B1 (en) | 2002-05-10 |
| DE60100669D1 (en) | 2003-10-02 |
| WO2001065695A2 (en) | 2001-09-07 |
| CA2398689C (en) | 2010-10-19 |
| DE60100669T2 (en) | 2004-07-08 |
| ATE248461T1 (en) | 2003-09-15 |
| US6507189B2 (en) | 2003-01-14 |
| WO2001065695A3 (en) | 2002-02-28 |
| EP1264404A2 (en) | 2002-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20210301 |