DE102011088539A1 - Stator for an electric machine - Google Patents

Abstract

The invention relates to a stator (1) for an electric machine, comprising an annular basic body (2) with a plurality of grooves (4), the grooves (4) each having an opening (7) on the radial inner side (17), at least one stator coil (5) arranged in the grooves (4), and an insert arrangement (3) inserted on the radial inner side (17) of the main body, wherein the insert arrangement (3) tapers the radially inward openings (7) of the grooves (4) and / or closes.

Description

The present invention relates to a stator for an electric machine and a method for manufacturing the stator.

In previously known electric machines, stator slots, in which the stator coil is located, are tapered in the direction of the rotor so as to optimally shape the magnetic flux between the stator and the rotor. However, these tapers complicate the introduction of the stator coils or limit the technologies that can be used for the production.

It is an object of the present invention to provide a stator for an electrical machine, which allows for a cost-effective and easy to assemble a very flexible design of the stator coil. Furthermore, it is an object of the present invention to provide a corresponding method for producing the stator.

The object is solved by the features of the independent claims. The dependent claims have corresponding advantageous developments of the invention the subject.

Thus, the object is achieved by a stator for an electric machine, comprising an annular base body with a plurality of grooves, wherein the grooves each have an opening on the radial inner side. The radial inner side of this main body is that side which faces the rotor in the electric machine. Furthermore, the stator according to the invention comprises at least one stator coil arranged in the slots and an insert arrangement inserted on the radial inner side of the base body. This insert arrangement is designed such that it tapers and / or closes the radially inward openings of the grooves. Characterized in that according to the invention a separate insert arrangement is provided, the stator coil can first be arranged in the grooves and only then the stator can be fully assembled. Thus, only after insertion of the stator coils in the grooves assembly of the insert assembly and thus the taper or the closing of the grooves. This reduces the effort for introducing the stator coils in the stator. Furthermore, so preformed coils can be introduced and it eliminates the process step of preforming and final forming of the winding head. Furthermore, due to the flexible design of the insert arrangement, the magnetic flux between stator and rotor can be designed to be very flexible. The fact that sufficient space is available for mounting the stator coil increases the copper fill factor in the stator.

It is preferably provided that the insert arrangement is designed as a closed, concentric ring to the main body. In this case, the insert assembly can be made in one piece and used as a whole in the body. Alternatively, the insert assembly is composed of several individual parts. The assembly of these items can either be done before assembly with the body, or it will be the individual parts separately inserted into the body, so that the, in particular annular, insert assembly is formed only in the body.

It is particularly preferably provided that the insert arrangement comprises alternating first sections and second sections in the circumferential direction. Particularly preferably, in each case a separate component forms a separate section. The individual components are assembled together to form the annular insert arrangement. The first section is preferably made of magnetically non-conductive material and the second section is preferably made of magnetically conductive material.

Particularly preferably, the insert arrangement is arranged such that the first section is positioned directly radially inside the openings of the grooves. Furthermore, particularly preferably, the first section tapers inward in the radial direction.

Particularly preferably, the individual components which constitute the individual sections of the insert arrangement are designed as "shaped parts". By appropriate design of the interfaces between these moldings, the items can be assembled into a ring.

The invention further comprises a method for producing a stator for an electric machine, comprising the following steps in the following order: (i) providing an annular base body of the stator with a plurality of grooves, wherein the grooves each have an opening on the radial inner side. (ii) placing at least one stator coil in the slots. (iii) inserting an insert assembly to the radially inner side of the body, wherein the insert assembly tapers and / or closes the radially inner side openings of the grooves.

The advantageous embodiments described within the scope of the stator according to the invention accordingly find preferred application to the method according to the invention.

Furthermore, it is provided in particular that the insert arrangement of several, magnetically non-conductive first components and a plurality of magnetically conductive second components is mounted.

Furthermore, the invention comprises an electric machine with a stator just described or a stator produced according to the method just described. In particular, a rotor is used in this stator. The insert assembly is then located between the rotor and the main body of the stator.

Further details, features and advantages of the invention will become apparent from the following description and the figures. Show it:

1 a simplified schematic representation of a portion of a stator according to the invention according to a first embodiment, and

2 a simplified schematic representation of a portion of a stator according to the invention according to a second embodiment.

In the following, a first embodiment of the stator 1 for an electric machine based on the 1 described.

1 shows a simplified schematic representation of a part of the stator 1 on average. Sliced is perpendicular to the illustrated rotor axis 6 , Furthermore, in 1 a radial direction 15 , an axial direction 16 and a circumferential direction 18 located. In its entirety is the stator 1 in the in 1 shown ring. However, in the simplified illustration is only a small section of the stator 1 represented in which the overall annular configuration of the stator 1 can not be seen.

The stator 1 includes a main body 2 , an insert arrangement 3 and at least one stator coil 5 , In the main body 2 are several grooves 4 educated. These grooves 4 pointing to a radial inside 17 of the basic body 4 one opening each 7 on. The remaining sides of the grooves 4 , especially those of the opening 7 opposite side are closed. The inner wall of the grooves 4 comes with an insulation 10 designed.

Even before the assembly of the insert 3 gets into the grooves 4 the stator coil 5 assembled. Only after mounting the stator coil 5 the assembly of the insert assembly takes place 3 ,

In the first embodiment, this insert arrangement 3 formed as a single-piece, concentric ring. The insert arrangement 3 is concentric to the main body 2 or to the rotor axis 6 arranged. In this assignment 3 are several extension grooves 8th intended. Here is the insert arrangement 3 arranged so that every opening 7 each one of the extension grooves 8th opposite and thus the groove 4 in the insert arrangement 3 is extended. The bottom of these extension grooves 8th is by means of a closure portion nine locked. This closure proportion nine is an integral part of the insert arrangement 3 ,

Based 2 A second embodiment of the invention will be described. The same or functionally identical parts are provided in all embodiments with the same reference numerals.

In contrast to the first embodiment, the insert arrangement is in the second embodiment 3 constructed in several parts. For this purpose, the insert arrangement 3 from first mold inserts 11 and second mold inserts 12 composite (the mold inserts are also called "first section 11 "And" second section 12 " designated). The first mold inserts 11 and the second mold inserts 12 alternate alternately. The first mold inserts 11 are each radially within the openings 7 arranged. Between two adjacent first mold inserts 11 there is a second mold insert in each case 12 , Furthermore, the first mold inserts 11 in the radial direction in a taper 13 and an expansion 14 divided. The rejuvenation extends 13 in the radial direction 15 at least twice, especially at least three times, as long as the expansion 14 , The rejuvenation 13 is on the radially outer side of the insert assembly 3 arranged.

The first mold insert 11 (first section) is made of a magnetically non-conductive material. The second mold insert 12 (second section) consists of a magnetically conductive material.

LIST OF REFERENCE NUMBERS

1

stator

2

body

3

insert arrangement

4

groove

5

stator coils

6

rotor axle

7

opening

8th

Fortsatznut

9

closing share

10

insulation

11

first mold insert (first section)

12

second mold insert (second section)

13

rejuvenation

14

widening

15

radial direction

16

axial direction

17

inside

18

circumferentially

Claims (9)

Stator ( 1 ) for an electrical machine, comprising - an annular base body ( 2 ) with several grooves ( 4 ), wherein the grooves ( 4 ) on the radial inside ( 17 ) one opening each ( 7 ), - at least one in the grooves ( 4 ) arranged stator coil ( 5 ), and - one on the radial inside ( 17 ) of the body used insert arrangement ( 3 ), wherein the insert arrangement ( 3 ) the radially inside openings ( 7 ) of the grooves ( 4 ) tapers and / or closes. Stator according to claim 1, characterized in that the insert arrangement ( 3 ) as closed, to the main body ( 2 ) concentric ring is formed. Stator according to one of the preceding claims, characterized in that the insert arrangement ( 3 ) in the circumferential direction ( 18 ) alternating first sections ( 11 ) and second sections ( 12 ), the first section ( 11 ) of magnetically non-conductive material and the second section ( 12 ) consists of magnetically conductive material. Stator according to Claim 3, characterized in that the first section ( 11 ) directly radially inside the openings ( 7 ) is arranged. Stator according to one of Claims 3 or 4, characterized in that the first section ( 11 ) in the radial direction ( 15 ) is tapered to the inside. Stator according to one of the preceding claims, characterized in that the insert arrangement ( 3 ) is made in one piece. Method for producing a stator ( 1 ) for an electrical machine, comprising the following steps in a given order: - providing an annular base body ( 2 ) of the stator ( 1 ) with several grooves ( 4 ), wherein the grooves ( 4 ) on the radial inside ( 17 ) one opening each ( 7 ), - arranging at least one stator coil ( 5 ) in the grooves ( 4 ), and - inserting an insert assembly ( 3 ) to the radial inside ( 17 ) of the basic body ( 2 ), wherein the insert arrangement ( 3 ) the radially inside openings ( 7 ) of the grooves ( 4 ) tapers and / or closes. Method according to claim 7, characterized in that the insert arrangement ( 3 ) from first, magnetically non-conductive mold inserts ( 11 ) and second, magnetically conductive mold inserts ( 12 ) is mounted. Electric machine with a stator according to one of claims 1 to 6 or a stator produced according to claims 7 or 8.

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