DE102015213020A1 - electric motor - Google Patents

Abstract

The invention relates to an electric motor (1) with a stator (19) and a rotor (18) which is rotatably mounted in a housing, with a Geberpolrad (2) which is rotatably mounted on the rotor (18). The object of the invention is in an electric motor (1) with Geberpolrad (2) to ensure that this is easy to manufacture and assemble, it requires a small axial length and accurate axial assignment and attitude adjustment to a statorfesten sensor is possible. This object is achieved by the features of the device claim 1 and by the features of the method claim 22.

Description

The invention relates to an electric motor ( 1 ) with a stator ( 19 ) and a rotor ( 18 ), which is rotatably mounted in a housing, with a Geberpolrad ( 2 ), which on the rotor ( 18 ) is mounted rotatably.

In the DE 198 23 640 a donor pole wheel mounted on a shaft is described in which, despite different thermal expansion coefficients of the metallic shaft and a plastic-bonded permanent magnet, a press connection is to be made. The problem is solved in that the encoder wheel consists of two axial sections, with a first section is freed to the shaft and a second section is pressed by means of an annular auxiliary body as a reinforcing element. Due to the two axial sections an enlarged axial space is required. In addition, the Geberpolrad despite the great length is attached to one side only on a short section. The arrangement further requires an additional joining process for mounting the reinforcing means.

The object of the invention is therefore to ensure in an electric motor with Geberpolrad that this is easy to manufacture and assemble, it requires a small axial length and accurate axial assignment and attitude adjustment to a statorfesten sensor is possible.

This object is achieved by the features of the device claim 1 and by the features of the method claim 22. It is proposed that the encoder pole wheel ( 2 ) from a magnetic ring ( 7 ), which is designed for the magnetic properties and consists of a carrier ( 3 ), which may consist of a simple plastic material, to which no particularly high demands are placed on strength and heat resistance. Since the carrier ( 3 ) Fastening means ( 4 ), which axially in recesses ( 12 ) of the rotor ( 18 ) and engage in this, an excellent positive rotational drive is given.

Further developments of the invention are presented in the subclaims. It has proved to be advantageous if the carrier ( 3 ) one support or several supports ( 6 ), which are connected to a shaft ( 25 ) of the rotor ( 18 ). This support prevents the encoder rotor ( 2 ) has a tilt tendency or tilted mountable.

In order to be able to permanently ensure this effect, it is provided that the support or the supports ( 6 ) adapted to a cylinder surface surface bearing surface / bearing surfaces ( 34 ), which directly on the shaft ( 25 ) is present. Because the wave ( 25 ) also has a cylindrical surface is a large area, rich contact surface or contact surfaces ( 34 ) given that undergo no change in shape even under vibration load and lose the advantage described.

Preferably, there are three or more supports ( 6 ), to which radially a sleeve ( 29 ) or that at a support ( 6 ) this is sleeve-shaped. This results in a precise centering of the encoder pole wheel ( 2 ) on the shaft ( 25 ).

On the one hand a simple installation without risk of damaging the encoder rotor ( 2 ) and on the other hand a possible backlash-free connection between encoder ( 2 ) and wave ( 25 ), it is provided that the support or supports ( 6 ) with the wave ( 25 ) is dimensioned according to a transitional fit / are.

According to a particularly advantageous embodiment of the invention, the encoder rotor ( 2 ) one or more axial stops ( 36 ), which projects axially from this or projecting. The axial stop (s) ( 36 ) closes / close to the support or supports ( 6 ) axially. As a result, during assembly, the final position of the Geberpolrads ( 2 ) can be set defined by axial pressurization.

Radial to the sleeve ( 29 ) or to the sleeve-shaped support ( 6 ) an annular disk-shaped hub ( 30 ) at. The hub ( 30 ) serves a radial distance between the shaft ( 25 ) or the Auflagern ( 6 ) and / or the sleeve ( 29 ) and the magnetic ring ( 7 ), where as possible no accumulation of material should occur, which would lead to deformation after cooling of the injection molding compound. That's why the hub ( 30 ) disc-shaped, so that the entire carrier ( 3 ) has approximately the same wall thickness in its different areas.

Appropriately, closes radially to the hub ( 30 ) a magnet receiving ring ( 9 ) at. It is further provided that the magnet receiving ring ( 9 ) at its axial ends in each case by an annular wall ( 37 ) is extended axially, wherein between the magnet receiving ring ( 9 ) and the ring walls ( 37 ) a groove ( 33 ) is trained. This groove ( 33 ) serves as axial securing for the magnetic ring ( 7 ). Due to the ring-shaped nature of the magnet ring ( 7 ) This is also held radially secure.

Depending on the design, at least part of the magnet ring ( 7 ) in the groove ( 33 ) or the magnetic ring ( 7 ) can radially over the groove ( 33 ). Next, the magnetic ring ( 7 ) outside the groove ( 33 ) axially as far extend that the axial boundary of the ring walls ( 37 ) and the magnetic ring ( 7 ) lie in one plane. This results in a wider magnetic ring ( 7 ), which is more likely to be the donor pole ( 2 ) is directly opposite. To amplify this effect, the magnetic ring ( 7 ), depending on whether this allows the surrounding geometry, even further on the ring walls ( 37 ) survive.

The fastening means ( 4 ) close at least partially axially to the hub ( 30 ) at. But you can also at least partially axially to the magnet receiving ring ( 9 ), depending on the diameter of the fasteners ( 4 ) and the corresponding recesses ( 12 ) of the rotor ( 18 ) are dimensioned.

Particularly advantageous is the further embodiment of the fastening means ( 4 ) in such a way that it becomes one of the encoder rotor ( 2 ) Rejuvenate distant areas. This facilitates on the one hand the joining process in the recesses ( 12 ) and on the other hand, the press-in force increases depending on the press-in depth. However, since the taper is relatively small, the axial position of the Geberpolrads ( 2 ) without problems over a larger axial range.

This effect is further improved by the fixing means ( 4 ) along their axial extent recesses ( 14 ), which z. In the form of notches ( 40 ), Slots ( 32 ) and / or cavities ( 31 ), because this achieves a certain flexibility.

A frictional connection is the better, the rougher a joining surface. Therefore, it makes sense that the fastening means ( 4 ) in recesses ( 12 ) of a rotor core ( 26 ) are positively positively received in the rotational direction axially.

To ensure that the encoder wheel ( 2 ) remains in its axial position, is provided between the rotor core ( 26 ) and the encoder pole wheel ( 2 ) a feather ( 42 ), which the encoder pole wheel ( 2 ) axially to the second deep groove ball bearing ( 15 ). Thus, this does not increase the number of parts and the assembly cost, it makes sense that the spring ( 42 ) from the material of the carrier ( 3 ) and is integral with this.

A second solution of the object is achieved by a method having the following method steps: a) providing a rotor assembly consisting of a shaft ( 25 ), a pressed rotor laminated core ( 26 ) with mounted permanent magnets ( 27 ); b) Pre-assembly of a donor pole wheel ( 2 ) in recesses ( 12 ) of the rotor core ( 26 ); c) pressing on a deep groove ball bearing ( 15 ) on the shaft ( 25 ) and setting a defined distance between a shaft end and an inner ring ( 39 ) of the deep groove ball bearing ( 15 ), whereby the encoder pole wheel ( 2 ) into the recesses ( 12 ) of the rotor core ( 26 ) are pressed. Through these measures, manufacturing tolerances of the individual parts of the electric motor ( 1 ), which have an influence on the position of a magnetic sensor, can be compensated in an elegant manner.

For further assembly is provided, the permanent magnets ( 27 ) and a magnetic ring ( 7 ) of the encoder pole wheel ( 2 ) magnetized simultaneously. As a result, an additional process step is saved.

Finally, a stator assembly consisting of a housing pot ( 10 ) with a mounted stator ( 19 ) and mounted first deep groove ball bearing ( 8th ), which serves as a fixed bearing, and the stator assembly mounted on the rotor assembly, wherein a sleeve-like tool to an inner ring ( 39 ) of the first deep groove ball bearing ( 8th ) and defines this on the shaft ( 25 ) is pressed.

An embodiment of the invention will be explained in more detail with reference to an example. Show it:

1 an end view of a first embodiment of a Geberpolrads,

2 a spatial sectional view of the Geberpolrads according to 1 .

3 a representation according to 2 from a different perspective,

4 a sectional view of the first embodiment of the encoder pole,

5 a further sectional view of the encoder pole wheel,

6 another end view of the encoder pole wheel,

7 a donor pole wheel mounted on a rotor,

8th a second embodiment of a Geberpolrads,

9 a variant of the second embodiment of the Geberpolrads and

10 an electric motor with a Geberpolrad the first embodiment.

Note: Reference numerals with apostrophe and corresponding reference numerals without apostrophe designate same-named details in the drawings and the description of the drawings. It is the use in another embodiment, the prior art and / or the detail is a variant. The claims, the introduction to the description, the list of reference numerals and the abstract contain, for the sake of simplicity, only reference symbols without an apostrophe.

The 1 to 6 show from different perspectives a first embodiment of a Geberpolrads 2 consisting of a carrier 3 and a magnetic ring 7 , The carrier 3 consists of a ring-shaped hub 30 to which six fasteners 4 , a central sleeve 29 and a magnet receiving ring 9 connect. The magnet receiving ring 9 (please refer 2 ) sits radially through two ring walls 37 which are spaced from each other. The magnet receiving ring 9 and the ring walls 37 together form a radially outwardly open groove 33 (please refer 2 ). The groove 33 is through a magnetic ring 7 filled. The magnetic ring 7 sits radially over the ring walls 37 and forms a cylindrical outer contour. The axial limit of the magnet ring 7 and the axial boundary of the ring walls 37 lie in a plane. The sleeve 29 jumps axially opposite the magnetic ring 7 and the ring walls 37 in front. To the sleeve 29 Close radially inward by three 120 ° angular distance from each other arranged supports 6 on, which serve as a support means. These have radially inner bearing surfaces 34 on, which are adapted to a cylinder jacket surface. In an assembled state, they form with a shaft 25 (please refer 9 ) a transition fit. Axial point the supports 6 each an axial stop 36 (please refer 2 ) on; These are used to rest on a second deep groove ball bearing 15 (please refer 9 ). The axial stops 36 jump opposite the sleeve 29 axially forward. The fasteners 4 have the shape of tapered, slotted sleeves 29 on, with cavities 31 and one inside slot each 32 , The fasteners 4 serve as anti-twist device for the encoder rotor 2 , A chamfer 35 (please refer 3 . 4 ) at the end of the fasteners 4 and also their rejuvenation should be the introduction into recesses 12 a rotor core 26 facilitate (see 9 ). The taper is also intended for a firm, non-positive connection in these recesses 12 to care. The slots 32 allow a certain flexibility of the fasteners 4 so that their diameter decreases slightly and to the recesses 12 can adjust in the laminated core. The fasteners 4 extend radially from the sleeve 29 over the hub 30 until the magnet receiving ring 9 , The carrier 3 is with the sleeve 29 , the hub 30 , the fasteners 4 , the supports 6 and the magnet receiving ring 9 integrally. The magnetic ring 7 consists of a plastic-bonded permanent magnet 27 (please refer 1 ), z. A rare earth magnet such as NdFeB. The donor pole wheel 2 is produced by means of a two-component injection molding process, wherein first the carrier 3 from a plastically deformable plastic material in a first cavity is uroformed and then the magnetic ring 7 from the plastic-bonded permanent magnet material in a second cavity with the carrier 3 is joined by archetypes. To the material of the wearer 3 are no very high demands, because due to the positive connection with the rotor core 26 on a press connection with the shaft 25 can be waived. The supports 9 prevent tilting of the encoder rotor 2 can occur. In 1 is a cone-like draft angle 41 indicated, which facilitates the demolding of an injection molding tool. The supports 6 have no draft angles 41 to provide a defined bearing surface.

7 , shows in two by 150 ° inclined to each other cutting planes (see line AA in 1 ) the encoder pole wheel 2 of the first embodiment mounted to a rotor 18 , which are with the carrier 3 one-piece fasteners 4 in axially parallel recesses 12 a rotor core 26 extend and are held in a non-positive. A support 6 of the encoder pole wheel 2 that is integral with the wearer 3 is, lies on a wave 25 on. This will tilt the encoder rotor 2 prevented. An axial stop 36 lies axially on the inner ring 39 a deep groove ball bearing 15 at. This makes it possible that when joining the deep groove ball bearing 15 the Einpresstiefe the fasteners 4 in the recesses 12 is set. Basically, the number of fasteners 4 freely selectable, but it is recommended at least two, preferably three or more fasteners 4 provided.

8th shows stylized a second embodiment of a Geberpolrads 2 ' , with a carrier 3 ' and a magnetic ring 7 ' , With the carrier 3 ' here are two fasteners 4 ' in one piece, which is axially parallel to the carrier 3 ' extend away. The fasteners 4 ' are each with four tapered ribs 38 provided, which form a cross-shaped arrangement and by notches 40 are separated from each other. In stock 6 are omitted here for the sake of simplicity, but they can be shaped similar to the first embodiment. Instead of discrete supports could also be an annular support 6 ' be used.

9 shows a variant of the second embodiment of the Geberpolrads 2 '' in which a spring 42 made of plastic with the carrier 3 '' is one piece. The feather 42 consists of two spaced apart and over webs 17 interconnected rings 13 , More bridges 17 connect that first of the rings 13 with the carrier 3 '' , The between the rings 13 arranged webs 17 are opposite to those between the carrier 3 '' and the sensor 43 (please refer 10 ) arranged webs 17 offset by 90 °. At the outer ring 13 close axially two projections 23 at 90 ° to the rings 13 connecting webs 17 are angularly offset. The projections 23 serve as defined contact surfaces for installation on the rotor core 26 , Due to the angular offset of the webs 17 with each other and the projections 23 opposite the jetties 17 becomes a compliance of the spring 42 allows by removing the areas of the rings 13 between the bridges 17 are elastically deflectable in the axial direction. By the spring 42 it is always ensured that the encoder wheel 2 '' at the second deep groove ball bearing 15 is applied.

10 shows an assembly drawing of an electric motor 1 , which is an electronically commutated DC motor, which is one with permanent magnets 27 equipped rotor 18 one with a winding 24 wound stator 19 and a housing. The housing consists of a bearing plate 20 and the housing pot 10 , The rotor 18 consists of a smooth wave 25 , a rotor core 26 , the permanent magnet 27 and a donor pole wheel 2 which is on a support 3 (please refer 1 to 6 ) is held by the fastening means 4 in recesses 12 of the rotor core 26 is pressed axially. With the encoder wheel 2 a sensor acts 43 together, which on a circuit board 21 radially to the encoder pole wheel 2 is arranged; Alternatively, an axial arrangement would be possible. The circuit board 21 is designed as overmolded baffle, which is a plug 22 includes. Next is a first deep groove ball bearing 8th that with the spring steel disc 5 is attached, a second deep groove ball bearing 15 , a cap 16 which is in a cut-out 14 is attached, a flanged gear pump 28 and a laminated stator core 11 shown. When mounting the encoder rotor 2 can the axial position relative to the rotor 18 be adjusted within certain limits to the respective actual dimensions. The axial stops serve this purpose 36 (please refer 1 to 6 ), which are on the inner ring 39 of the second deep groove ball bearing 15 can support. In this way, a precise position assignment to the sensor can be 43 produce. The donor pole wheel 2 and the rotor 18 each have three north poles and three south poles.

LIST OF REFERENCE NUMBERS

1

 electric motor

2

 Geberpolrad

3

 carrier

4

 fastener

5

 Spring steel disc

6

 In stock

7

 magnetic ring

8th

 first deep groove ball bearing

9

 Magnetic recording ring

10

housing pot

11

stator lamination

12

recesses

13

ring

14

cutout

15

second deep groove ball bearing

16

cap

17

web

18

rotor

19

stator

20

end shield

21

circuit board

22

plug

23

head Start

24

winding

25

wave

26

Laminated core

27

permanent magnet

28

gear pump

29

shell

 30

 hub

 31

 cavity

 32

 slot

 33

 groove

 34

 bearing surface

 35

 chamfer

 36

 axial stop

 37

 ring wall

 38

 rib

 39

 inner ring

 40

 score

 41

 draft angle

 42

 feather

 43

 sensor

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19823640 [0002]

Claims (24)

Electric motor ( 1 ) with a stator ( 19 ) and a rotor ( 18 ), which is rotatably mounted in a housing, with a Geberpolrad ( 2 ), which on the rotor ( 18 ) is rotatably mounted, characterized in that the encoder rotor ( 2 ) made of a plastic material carrier ( 3 ) and a magnetic ring ( 7 ) and the carrier ( 3 ) Fastening means ( 4 ) which axially in recesses ( 12 ) of the rotor ( 18 ) intervene. Electric motor ( 1 ) according to claim 1, characterized in that the carrier ( 3 ) one support or several supports ( 6 ), which are connected to a shaft ( 25 ) of the rotor ( 18 ). Electric motor ( 1 ) according to claim 2, characterized in that the support or the supports ( 6 ) adapted to a cylinder surface surface bearing surface / bearing surfaces ( 34 ), which directly on the shaft ( 25 ) issue. Electric motor ( 1 ) according to claim 2 or 3, characterized in that the support or the supports ( 6 ) with the wave ( 25 ) is dimensioned according to a transitional fit / are. Electric motor ( 1 ) according to one of claims 2 to 4, characterized in that three or more supports ( 6 ) are provided, on which radially a sleeve ( 29 ) or that at a support ( 6 ) this is sleeve-shaped. Electric motor ( 1 ) according to claim 1, 2, 3, 4 or 5, characterized in that the encoder pole wheel ( 2 ) one or more axial stops ( 36 ), which projects axially from this or projecting. Electric motor ( 1 ) according to claim 6, characterized in that the or the axial stop / axial stops ( 36 ) to the support or supports ( 6 ) connects / connect axially. Electric motor ( 1 ) according to at least one of claims 2 to 7, characterized in that the encoder pole wheel ( 2 ) via the axial stops ( 36 ) on a bearing, in particular the inner ring ( 39 ) of a deep groove ball bearing ( 15 ) are axially supportable. Electric motor ( 1 ) according to claim 5, 6, 7 or 8, characterized in that radially to the sleeve ( 29 ) or to the sleeve-shaped support ( 6 ) an annular disk hub ( 30 ). Electric motor ( 1 ) according to claim 9, characterized in that radially to the hub ( 30 ) a magnet receiving ring ( 9 ). Electric motor ( 1 ) according to claim 10, characterized in that the magnet receiving ring ( 9 ) at its axial ends in each case by an annular wall ( 37 ) is extended axially, wherein between the magnet receiving ring ( 9 ) and the ring walls ( 37 ) a groove ( 33 ) is trained. Electric motor ( 1 ) according to claim 11, characterized in that at least part of the magnet ring ( 7 ) in the groove ( 33 ) is recorded. Electric motor ( 1 ) according to claim 12, characterized in that the magnetic ring ( 7 ) radially over the groove ( 33 ). Electric motor ( 1 ) according to claim 13, characterized in that the magnetic ring ( 7 ) outside the groove ( 33 ) extends axially so far that the axial boundary of the annular walls ( 37 ) and the magnetic ring ( 7 ) lie in one plane. Electric motor ( 1 ) according to at least one of claims 9 to 14, characterized in that the fastening means ( 4 ) at least partially axially to the hub ( 30 ) connect. Electric motor ( 1 ) according to at least one of claims 9 to 15, characterized in that the fastening means ( 4 ) at least partially axially to the magnet receiving ring ( 9 ) connect. Electric motor ( 1 ) according to at least one of the preceding claims, characterized in that the fastening means ( 4 ) to one of the donor pole wheel ( 2 ) Rejuvenate distant areas. Electric motor ( 1 ) according to at least one of the preceding claims, characterized in that the fastening means ( 4 ) along their axial extent recesses ( 14 ), which z. In the form of notches ( 40 ), Slots ( 32 ) and / or cavities ( 31 ) may be formed. Electric motor ( 1 ) according to at least one of the preceding claims, characterized in that the fastening means ( 4 ) in recesses ( 12 ) of a rotor core ( 26 ) are positively frictionally and positively received in the direction of rotation. Electric motor ( 1 ) according to at least one of the preceding claims, characterized in that between the rotor laminated core ( 26 ) and the encoder pole wheel ( 2 ) a feather ( 42 ) is arranged, which the Geberpolrad ( 2 ) axially to the second deep groove ball bearing ( 15 ). Electric motor ( 1 ) according to claim 20, characterized in that the spring ( 42 ) from the Material of the carrier ( 3 ) and is integral with this. Method for mounting a transmitter pole wheel ( 2 ) on a rotor ( 18 ) of an electric motor ( 1 ), which has a housing and a stator ( 19 ), characterized by the following method steps: a) providing a rotor assembly consisting of a shaft ( 25 ), a pressed rotor laminated core ( 26 ) with mounted permanent magnets ( 27 ); b) Pre-assembly of a donor pole wheel ( 2 ) in recesses ( 12 ) of the rotor core ( 26 ); c) pressing on a deep groove ball bearing ( 15 ) on the shaft ( 25 ) and setting a defined distance between a shaft end and an inner ring ( 39 ) of the deep groove ball bearing ( 15 ), whereby the encoder pole wheel ( 2 ) into the recesses ( 12 ) of the rotor core ( 26 ) is pressed. Method for mounting a transmitter pole wheel ( 2 ) according to claim 22, characterized by the further method step: d) magnetizing the rotor ( 18 ), wherein the permanent magnets ( 27 ) and a magnetic ring ( 7 ) of the encoder pole wheel ( 2 ) are magnetized simultaneously. Method for mounting a transmitter pole wheel ( 2 ) according to claim 22 or 23, characterized by the further method step: e) providing a stator assembly consisting of housing pot ( 10 ) with mounted stator ( 19 ) and mounted first deep groove ball bearing ( 8th ), which serves as a fixed camp; f) pressing the stator assembly onto the rotor assembly, whereby an inner ring ( 39 ) of the first deep groove ball bearing ( 8th ) defined on the shaft ( 25 ) is pressed.

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