DE10240580A1 - Rotor for an electric drive mechanism, has a rotor casing maintaining a torque-proof link to a rotor axle and partly interspersing a stator with torque-proof bearings - Google Patents

Abstract

A rotor has a rotor casing (6) maintaining a torque-proof link to a rotor axle and partly interspersing a stator with torque-proof bearings. Numerous radial links (12,13) set with a clearance from each other and running radially to a rotor axle are molded onto the rotor casing. Part of the radial links is interspersed by numerous recess grooves (14) running in the direction of the rotor axle. An Independent claim is also included for a method for producing a rotor for an electric drive mechanism.

Description

The invention relates to a rotor an electric drive according to the preamble of claim 1 and a method for its production according to the Oberbgeriff of claim 7.

Electric drives have at least a movable element which, depending on the design of the electric drive as a rotor in rotary machines or as a so-called rotor Linear drives can be formed. The moving elements permanent magnets are also assigned, their polarity in Circumferential direction of the rotor is alternately positive or negative, so as the so-called South Pole or north pole is. As a rule, such magnets extend in the axial direction of the rotor over the entire length of the the stator surrounding the rotor. To fix the permanent magnets on the rotor or stator, these are usually on the circumferential surface of the each moving element glued. From the state of the art it is also known, especially at high peripheral speeds of the rotors and in high-performance applications such as in generators to bandage the permanent magnets or by means of energy generation Fix rivets, screws or clamps on the peripheral surface of the rotor.

Are the permanent magnets through Gluing fixed on the respective peripheral surface are dependent from the curing properties the adhesive can sometimes take very long curing times can also be in the range of hours. Depending on the number and size of the magnets can be magnetized both before and after gluing. The latter has the disadvantage of having several magnets in one operation need to be magnetized what higher Energy densities are required. It also has certain geometric dimensions the magnet a complete It is no longer possible to magnetize the magnets already glued on.

If the magnets are already before Apply magnetized to the respective rotor, depending on Polarity of the magnets between considerable attraction and repulsion forces the individual magnet. These effects are greater the denser the magnets are arranged to each other on the respective rotor. To be as possible to achieve small electric drives with high power density and running quality but it is just necessary to use the magnets with very little To be spaced apart. But this leads to such great effects of force, that the fixation of already magnetized magnets presents considerable difficulties prepares, since magnets of the same polarity repel each other. This leads to, that the magnets during the curing phase of the adhesive tend to wander. This requires additional Fixative that holds the magnets during the curing phase hold in the intended position. To avoid this z So-called milled magnetic surfaces on the rotors, into which the magnets then can be used precisely and fixed with adhesive. Due to the huge The number of magnets per rotor makes these processes time-consuming and expensive. It is also known to start with the rotors To wrap plastic nets, the meshes of the plastic nets determine the later position of the magnets. Such methods are particularly problematic primarily because because an auxiliary is used here, which in addition to higher manufacturing costs for the Plastic network after a considerably more complicated assembly process pulls itself.

The object of the invention is therefore based on an electric drive and a method for the same Manufacturing to develop in which the moving element, as a rule the rotor or rotor inexpensive and is technologically simple to manufacture.

According to the invention, the object is achieved by characteristic features of claims 1 and 7 solved.

By making the rotor shell a variety Radial webs spaced apart from one another radially to the rotor axis are integrally formed and at least part of the radial webs of one Large number of recess grooves running in the direction of the rotor axis is enforced, results in an inexpensive and technologically simple producible version of the moving element of an electric drive. In this way can be both on fixation aids and time and cost intensive Formation of magnetic seat surfaces to be dispensed with.

The fixing effect of the radial webs The ones with deepening grooves are to be optimally designed Radial webs and the circumferential radial webs alternately on the Rotor shell arranged. To the fixing effect in the radial direction could increase in eggs advantageous development of the invention also several of deepening grooves penetrated radial webs to be assigned adjacent to each other.

A particularly high running quality of the electrical Drives are achieved when the distance between adjacent magnets is low. In an advantageous development of the invention, this becomes reached when the radial webs penetrated by the recess grooves are designed as pin webs.

By adjacent pin webs and circumferential radial webs between them a space for positive locking will clamp at least one permanent magnet in a simple manner ensured that with the rotor shell for example by Adhesive magnets to be connected during the curing of the Adhesive in both the axial and radial directions the rotor shell are fixed, so that a shift due of the acting magnetic forces cannot occur.

A particularly inexpensive process The manufacture of the rotors according to the invention is obtained if radial grooves are machined into the rotor shell in a first operation and axial grooves are machined in the axial direction of the rotor in a further operation. By creating the radial grooves in the simplest case using a chisel on a lathe and the axial grooves by milling using a face milling cutter, safe fixing aids for the magnets to be applied to the rotor shell are created with little expenditure of time and money.

Further advantageous configurations are the subject of further subclaims and are described below based on drawings explained.

Show it:

1 an electric drive with a rotor according to the invention

2 a detailed view of the rotor according to the invention 1

1 shows one as a linear or rotary drive 1 executed electric drive 2 which in a manner known per se from a stationary stator 3 and the stator 3 rotor penetrating inside 4 is formed. The rotor 4 is non-rotatable with one axis of rotation 5 connected and takes on his rotor shell 6 a variety of permanent magnets 7 on, being in 1 for the sake of simplicity only a part of these permanent magnets 7 is shown schematically. The permanent magnets 7 are in a manner known per se in the axial and radial direction through spaces 8th separated from each other.

Depending on whether the electric drive 2 as a linear or rotary drive 1 the rotor moves 4 on a linear path in the direction of the arrow 9 or rotates according to the direction of the arrow 10 ,

In 2 is a detail of the rotor shell 6 with on the rotor shell 6 arranged permanent magnets 7 shown. Right of the permanent magnet 7 are in the simplest case the radial grooves machined into the rotor shell by means of a chisel 11 to recognize the radial webs according to the invention between them 12 form. Left of the permanent magnet 7 are next to the circumferential radial webs 12 . 13 more of deepening grooves 14 penetrated radial webs 12 shown, in the illustrated embodiment between adjacent circumferential radial webs 12 . 13 two each of deepening grooves 14 penetrated radial webs 12 are arranged. By the deepening grooves 14 the respective radial webs over a large area 12 break through these radial webs 12 on so-called pin bridges 15 reduced.

In the manner according to the invention, adjacent pin webs each tension 15 and also adjacent circumferential radial webs 12 . 13 a space between them 16 on that of one permanent magnet each 7 is enforced. The pin webs form 15 the radial direction 10 and the circumferential radial webs 12 . 13 the in the axial direction 9 the movement of the permanent magnets 7 blocking attacks 18 ,

A particularly inexpensive and effective method for producing these stops 18 is achieved when the radial grooves are used in a first step 11 and in a further step the axial grooves 14 in the rotor shell 6 be incorporated.

In the simplest case, the radial grooves 11 can be worked out by cutting out with a chisel. For the introduction of the axial grooves 14 In the simplest case, face milling cutters are used, which are between the circumferential radial webs 12 . 13 be performed that the pin webs according to the invention 15 arise.

It is also within the scope of the invention other than the rotor described in the embodiment 4 to produce by the method according to the invention in order to achieve the effects described.

1

Linear- or rotary motor

2

electrical drive

3

stator

4

rotor

5

axis of rotation

6

rotor casing

7

permanent magnet

8th

gap

9

arrow

10

arrow

11

radial grooves

12

radial web

13

radial web

14

recessed grooves

15

pin dock

16

free space

17

18

attacks

Claims (9)

Rotor of an electric drive, the rotor being formed by a rotor casing connected in a rotationally fixed manner to a rotor axis and the rotor casing passing at least partially through a rotatably mounted stator, characterized in that the rotor casing ( 6 ) a large number radial to the rotor axis ( 5 ) mutually spaced radial webs ( 12 . 13 ) are molded on and at least part of the radial webs ( 12 ) in the direction of the rotor axis ( 5 ) extending grooves ( 14 ) is enforced. Rotor according to claim 1, characterized in that the recess grooves ( 14 ) penetrated radial webs ( 12 ) and the circumferential radial webs ( 12 , 13 ) are arranged alternately and spaced apart. Rotor according to claim 3, characterized in that between circumferential radial webs ( 12 . 13 ) at least two of deepening grooves ( 14 ) radial webs ( 12 ) are arranged at a distance from each other. Rotor according to one or more of the preceding claims, characterized in that the recess grooves ( 14 ) penetrated radial webs ( 12 ) in the space between the deepening grooves ( 14 ) Pin webs ( 15 ) train. Rotor according to one or more of the preceding claims, characterized in that in each case adjacent circumferential radial webs ( 12 . 13 ) and neighboring pin bars ( 15 ) between the circumferential radial webs ( 12 . 13 ) arranged by recess grooves ( 14 ) radial webs ( 12 ) Rotor according to claim 5, characterized in that the free space ( 16 ) of at least one magnet ( 7 ) and the web pins ( 15 ) radial stops ( 18 ) and the circumferential radial webs ( 12 . 13 ) in the axial direction ( 9 ) of the rotor ( 4 ) pointing stops ( 18 ) of the magnet ( 7 ) form. A method for producing a rotor of an electric drive, characterized in that radial grooves ( 11 ) in the rotor jacket ( 6 ) and in a further work step in the axial direction ( 9 ) of the rotor ( 4 ) running deepening grooves ( 14 ) in the rotor jacket ( 6 ) are incorporated. Method for producing a rotor of an electric drive according to claim 7, characterized in that the radial grooves ( 11 ) are worked out by cutting out with a chisel. Method for producing a rotor of an electric drive according to claim 7, characterized in that the recess grooves ( 14 ) can be worked out by milling using a face mill.