DE102005033561A1 - Support ring for rotary electrical machine, has permanent magnets, each inserted into holder in form-fit manner, where each holder comprises two retaining sections for fixing holder in respective slot and for holding respective magnet - Google Patents

Abstract

The ring (10) has slots (16) running in an axial direction, spaced over a range and separated from one another. Permanent magnets (20), each inserted into a holder (22) in a form-fit manner are provided. Each magnet is arranged in a device that is inside each slot and formed from the holder and the magnet. Each holder comprises two retaining sections (30, 32) for fixing the holder in the respective slot and for holding the respective magnet, where the retaining sections acts independent of each other.

Description

The The invention relates to a according to the preamble formed by claim 1 support ring for receiving permanent magnets for one rotating electric machine with running in the axial direction, over the Circumferentially spaced grooves, each permanent magnet in one of these form-fitting receiving holder is inserted and formed of holder and permanent magnet Unit within each axial groove on the support ring is arranged.

A generic carrier ring is in the DE 197 05 432 A1 discloses, wherein in cross-section rectangularly shaped permanent magnets are each inserted in a plastic holder and wherein the magnets on the side facing away from the support ring two axially extending recesses, which are encompassed by the holders and fix the permanent magnets there. The holders have a trapezoidal outer contour in cross-section and are inserted into corresponding Nu th on the support ring and the yoke, whereby the units of permanent magnet and holder are securely fixed to the support ring.

It has in the described carrier ring as very expensive and costly, the permanent magnets with accurately fitting To provide recesses for inclusion in the holders. It is at such a carrier ring also due to manufacturing tolerances with reasonable effort not possible, on the one hand a precisely fitting recording of a permanent magnet in one Holder and on the other hand at the same time a just as accurate recording the assembly formed by a holder and a permanent magnet in a groove of the carrier ring sure. An especially resulting radial play leads one as an internal rotor trained electric machine, in which the magnets on the Outer peripheral surface of a Rotors are arranged to cause the units of permanent magnet and holder in operating the electric machine from the groove bottom of the carrier ring supersede can and then get stuck in the groove. Since the game gaps or Tolerances on each unit can be different for each of the permanent magnets another distance to the stator of the adjust electrical machine, causing a variation in width of the magnetically active air gap between the rotor and stator Consequence and which has the efficiency and other characteristics of the Electric machine can be affected significantly unfavorable.

From Based on this problem, should a carrier ring of the aforementioned Art be improved so that the permanent magnets on this in a predetermined radial position can be arranged without play.

The Problem is in a generic carrier ring with the characterizing Characteristics of claim 1 solved. The carrier ring according to the invention is characterized by the fact that the holder for fixing in a Groove and for receiving a permanent magnet two, essentially independent from each other having active holding sections.

this Suggested solution is based on the finding that in the state of the art known carrier ring the side parts of the holder at the same time both the contact to the Make yoke and the permanent magnet. It means that the form and / or adhesion of the effect pair magnet / holder directly also on those of the other action pair holder / yoke or vice versa. This can lead to manufacturing tolerances unfavorably superimpose.

Become however, according to the invention essentially independent holding sections formed on the holder, the said action pairs are decoupled and both holding functions can be optimized separately from each other manufacturing technology.

With Particularly advantageous, a holding section has an outwardly directed Shoulder, which is within a T-shaped retaining projection of the carrier ring radially supported. This allows the fixation of the holder within the groove on manufacturing technology simple way only about a measure of length, namely the Shoulder height, done, which can be realized with a sufficient tolerance is.

According to claim 3 has with further advantage of the holding portion for receiving a Trapezoidal in cross-section Permanent magnets on two mutually inclined retaining surfaces. A trapeze magnet is easy to manufacture and also has the advantage that this jammed with increasing speed in the holder and thereby the holding power is enhanced.

To reinforce the contact pressure and possibly to compensate for tolerances can be rolled according to claim 4 on the outer peripheral surface of the support ring in the region of the retaining projections preferably extending in the axial direction grooves, with due to the associated plastic deformation material areas on both sides shift in the circumferential direction and arrive in positive or non-positive engagement with the cooperating with a permanent magnet holding portions of the holder.

Of the Holder can, as proposed in claim 5, low from a plastic be made. This is opposite the hard and brittle magnetic material relatively soft, so that a permanent magnet protected embedded in the holder and in particular impact loads can catch. A plastic holder can, for example, in Injection molding process can be produced. The bottom plate has it a defined strength, whereby it is ensured that the magnets gerrings to the groove bottom of the Trä keep a defined gap. An increase in holding power can also already be achieved by the holder made of a plastic with a high thermal expansion is made, which exceeds that of the permanent magnet and the carrier ring.

The The invention will be explained by way of example with reference to a drawing. It demonstrate:

1 a carrier ring according to the invention with arranged in holders permanent magnets in radial section;

2 a detailed representation of a holder according to 1 ,

1 shows a partial radial section of a carrier ring 10 which forms the yoke of a permanent magnet rotor of an internal-rotor type electric machine (not shown). The carrier ring 10 is ring-shaped closed, but in the 1 shown in a linear fashion for the sake of simplicity.

On the outer peripheral surface 12 for example, from a laminated core 14 formed carrier ring 10 are a plurality of grooves extending in the axial direction and evenly spaced over the circumference 16 introduced, which by projecting T-shaped retaining projections 18 be separated and recording rooms 16 for permanent magnets 20 form. Every permanent magnet 20 is in a form-fitting receiving holder 22 made of plastic and made of holder 22 and permanent magnet 20 formed unit is within each axial groove 18 positive and captive on the support ring 10 arranged. The holders 22 include one at the bottom of the groove 24 adjacent base area 26 and two wall sections protruding therefrom 28 , each two holding sections 30 . 32 form, of which the first holding section 30 for receiving a permanent magnet 20 in the holder 22 and the second holding section 32 for fixing a holder 10 inside the groove 16 serves, both holding sections 30 . 32 essentially independent of one another and do not influence each other in their functions. The holding section 32 is by one on the wall areas 28 radially outwardly directed shoulder 34 formed, which in the T-shaped retaining projection 18 of the carrier ring 10 engages and the holder 22 fixed there radially. In the circumferential direction are the holders 22 with side surfaces 36 on both sides of the base 38 the T-shaped retaining projections 18 at.

The holding section 30 for fixing the permanent magnets 20 in the holder 22 comprises two mutually inclined retaining surfaces 40 , which at the facing these trapezoidal side surfaces 42 a permanent magnet 20 abut and thus support it radially and in the circumferential direction. The transition area 31 from the holding area 30 to the holding area 32 may preferably be designed elastically deformable, so that a permanent magnet 20 already under an elastic bias by widening the holding surfaces 40 in the holder 22 can be included.

To compensate for any remaining game gaps and to strengthen the holding force in the outer surface 12 of the carrier ring 10 in the region of the retaining projections 18 For example, by rolling preferably axially extending grooves 44 are introduced, whereby plastically deformed material areas 46 laterally, in the direction of the holding sections 30 be shifted and thus more closely to the trapezoidal surfaces 42 the permanent magnets 20 can create.

10

support ring

12

Outer circumferential surface

14

laminated core

16

groove

18

retaining projection

20

permanent magnet

22

holder

24

groove base

26

base region

28

wall area

30

holding section

31

Transition area

32

holding section

34

shoulder

36

side surface

38

Base the retaining projection

40

holding surface

42

Trapezoidal side surface

44

groove

46

deformed material areas

Claims (5)

Carrier ring ( 10 ) for receiving permanent magnets ( 20 ) for a rotary electric machine having axially extending circumferentially spaced grooves (US Pat. 16 ), each permanent magnet ( 20 ) in a form-fitting receiving holder ( 22 ) is inserted and the holder ( 22 ) and permanent magnet ( 20 ) formed within each groove ( 16 ) on the carrier ring ( 10 ), characterized in that the holder ( 22 ) for fixing in a groove ( 16 ) and for receiving a permanent magnet ( 20 ) two, substantially independent holding sections ( 30 . 32 ) having. Carrier ring according to claim 1, characterized in that the holding section ( 32 ) an outwardly directed shoulder ( 34 ), which within a T-shaped retaining projection ( 18 ) of the carrier ring ( 10 ) is supported radially. Carrier ring according to claim 1 or 2, characterized in that the holding section ( 30 ) for receiving a trapezoidal in cross-section permanent magnet ( 20 ) two mutually inclined retaining surfaces ( 40 ) having. Carrier ring according to one of claims 1-3, characterized in that the retaining projections ( 18 ) a groove ( 44 ) with one on the holder ( 22 ) adjacent plastically deformed area ( 46 ) exhibit. Carrier ring according to one of claims 1-4, characterized in that the holder ( 22 ) is made of a plastic.