CN112653277A

CN112653277A - Coil support for receiving a field winding of a rotor and electric machine having such a coil support

Info

Publication number: CN112653277A
Application number: CN201910954104.9A
Authority: CN
Inventors: 曾宪波
Original assignee: SEG Automotive Germany GmbH
Current assignee: SEG Automotive Germany GmbH
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2021-04-13
Anticipated expiration: 2039-10-09
Also published as: CN112653277B; DE102020108971A1

Abstract

The invention relates to a coil carrier (101) for receiving a field winding of a rotor (20) of an electric machine, comprising a cylindrical shell-shaped core element (150) for receiving the field winding and two limiting elements (75, 78) arranged on axial edges of the core element (150), wherein the two limiting elements (75, 78) are each designed as a disk having an annular shape and are designed with a plurality of wing-shaped elements (751, 781) projecting radially outward from the disk, wherein the coil carrier (101) has at least one first recess (754, 784) for each limiting element (75, 78), said first recess extending in the limiting element (75, 78) and in the core element (150). The invention further relates to an electric machine having such a coil support.

Description

Coil support for receiving a field winding of a rotor and electric machine having such a coil support

Technical Field

The present invention relates to a coil support for receiving a field winding of a rotor and to an electric machine having such a coil support.

Background

It is known that electrical machines can operate as generators and/or motors. Such machines typically have a rotor and a stator. The rotor can have two claw-shaped pole plates, on the outer circumference of which claw-shaped pole pins are arranged. Such a motor is shown, for example, in document DE102008002615a 1. This document also shows a coil carrier for receiving a field winding of a rotor, which has a cylindrical shell-like core element for receiving the field winding and two limiting elements arranged at the axial edges of the core element, wherein the two limiting elements are each designed as a disk having an annular shape and the disk has a plurality of wing-shaped elements projecting radially outward from the disk.

In such machines, for example, the field coils of the rotor wear out, which field coils can become loose and/or their insulation can be damaged.

Another problem with the machine is that the coil support is not optimally fixed relative to the claw pole plate, or the filling resin used to insulate and fix the field winding does not reach the field winding sufficiently.

Disclosure of Invention

According to the invention, a coil support for receiving a field winding of a rotor of an electric machine and an electric machine having such a coil support are provided, having the features of the independent claims. Advantageous embodiments are the subject matter of the dependent claims and the following description.

The measure of the invention consists in that each limiting element is provided with at least one first recess which extends both in the limiting element and in the core element. The recess serves as a through-flow opening for the filling resin during the production process. The coil carrier is then provided with the field winding during production and is then dipped into the potting resin. The filling resin can also reach the field winding abutting against the core element via the recess extending both in the limiting element and in the core element. This improves the insulation of the field winding and the fastening of the field winding to the coil support. Fatigue of the field winding is thus also prevented.

Advantageously, the at least one first recess extends in the disk and in the wing-shaped element. The longer the first recess is configured, the more area of the field winding can be reached by the filling resin during immersion in the manufacturing process.

The length over which the portion of the at least one first recess extending in the wing-shaped element extends is in particular approximately 60% to 95% of the radial length of the wing-shaped element. In this way a particularly large extension is achieved without compromising the stability of the wing-shaped element.

Preferably, the portion of the first recess extending in the core element extends over a length in the axial direction of 20% to 50% of the axial elongation of the core element. The resin is then filled during the immersion process to almost the entire field winding region abutting against the core element. The extension in the axial direction is advantageously limited to 50% of the elongation of the core element, so that the stability of the core element is not adversely impaired.

In an advantageous embodiment, the coil carrier has a first recess for each wing element, which extends in the wing element, the disk and the core element. This produces as large a flow as possible for the introduction of the potting resin to the field winding.

Each disc preferably has at least one protrusion extending in an axial direction away from the core element. This is advantageous because the projection can be configured for interaction with a groove on a claw pole plate which can be arranged adjacently. In this way, the coil support can be fixed better relative to the claw pole.

For this purpose, at least one first projection, preferably two first projections, is advantageously formed on each limiting element, so that they can be inserted with a positive fit into recesses on the adjacently arranged claw pole plates. In this way, a form-fitting connection is advantageously provided between the coil support and the claw pole plate.

In particular, at least one second projection is formed on each limiting element, such that the second projection has a smaller extension volume than the at least one first projection, so that it can engage in a recess in an adjacently arranged claw pole plate, so that an intermediate volume remains between the recess and the at least one second projection. This intermediate volume can advantageously be filled with a filling resin. Due to the interaction of the first and second projections, which are precisely matched and are adhered to the adjacent recesses of the adjacent claw-shaped pole plates by the filling resin, the coil support is ensured to be fixed very well to the adjacent claw-shaped pole plates.

In a further advantageous embodiment, each disk has a second recess running in the circumferential direction. The second recess preferably serves as a flow opening for introducing the filling resin into the intermediate volume between the annular projection and the adjacent groove of the adjacent claw pole plate and/or into the region of the intermediate exciter coil.

Each protrusion of each disc has two second recesses. The second recess can extend adjacent to the projection away from the projection in the circumferential direction. Alternatively, it can also extend at a distance from the projection in the circumferential direction. The distance is preferably less than half the extension of the projection in the circumferential direction or less than a quarter of the extension of the projection in the circumferential direction. The second recess is arranged in this way completely in the vicinity of the intermediate volume. In the case of an electric machine, the second recess preferably covers the adjacent groove of the adjacent claw pole plate, so that the filling resin can penetrate into the intermediate volume during immersion.

Advantageously, the second recesses are arranged in the radial direction in an area around 10% of the radial center of the disc. The intermediate positioning enables particularly good flow-through properties to be achieved in order to guide the filling resin into the intermediate volume.

The wing-shaped elements preferably have the shape of an isosceles trapezoid mirror-symmetrical with respect to the radial direction. This is a particularly strong and simple shape. But this is not to be understood in a limiting sense. Other shapes, such as shapes with a raised and/or rounded upper edge, are then also contemplated.

The electric machine according to a preferred embodiment of the invention has a rotor with two claw-shaped pole plates, wherein a coil support according to the invention is arranged between the two claw-shaped pole plates, wherein each limiting element on the coil support has the same number of wing-shaped elements as the claw-shaped pole pins of the adjacently arranged claw-shaped pole plates. This is advantageous because the wing-shaped element can be adapted in this way to the claw-shaped pole pin configuration. The wing-shaped elements of the first limiting element are arranged offset from one another by an angle relative to the wing-shaped elements of the second limiting element, which angle corresponds to the offset angle of two opposing claw-shaped pole plates, which are arranged adjacent to one another relative to the coil carrier.

Other advantages and design aspects of the invention are given by the description and the accompanying drawings.

Drawings

Embodiments according to the invention are schematically shown in the drawings and are described below with reference to the drawings.

Fig. 1 shows a schematic cross-sectional view of an electrical machine according to an embodiment of the invention;

fig. 2 shows a schematic perspective view of a coil support not according to the invention;

FIG. 3 shows a schematic perspective view of a coil support according to a preferred embodiment of the present invention;

fig. 4 shows a schematic top view of a coil support according to another preferred embodiment of the invention.

Detailed Description

Fig. 1 shows a cross section of an electric machine 10, in this case in the form of a generator or a three-phase alternator for a motor vehicle. The electric machine 10 also has a two-part housing 13, which is formed by a first bearing end cap 13.1 and a second bearing end cap 13.2. The bearing end cap 13.1 and the bearing end cap 13.2 are accommodated in a so-called stator 16, which is formed on the one hand by a substantially annular stator core 17 and in the radially inwardly directed, axially extending recesses of which stator windings 18 are embedded.

The annular stator 16 surrounds the rotor 20, which is a claw-pole rotor, with its radially inwardly directed slotted surface. The rotor 20 further comprises two

claw pole plates

22 and 23, on the outer circumference of which claw pole pins 24 and 25 are arranged, respectively, which extend in the axial direction. The two

claw pole plates

22 and 23 are arranged in the rotor 20 in such a way that their claw pole pins 24 and 25 extending in the axial direction alternate with one another over the circumference of the rotor 20. A magnetically required gap, referred to as a claw pole gap, is thus obtained between the oppositely magnetized claw pole pins 24 and 25.

The rotor 20 is rotatably mounted in the respective bearing end cap 13.1 or 13.2 by means of a shaft 27 and each rolling bearing 28 on each rotor side.

The coil support 60 is arranged radially outside the pole piece 63. The coil carrier 60 has the task of insulating the field winding 51 from the

claw pole plates

22 and 23 and, on the other hand, acting as a molded element in the pre-fabricated context, in particular after the end of the winding process with respect to the field winding wire. The coil carrier 60 is thereby pushed axially on the pole body 63 and then fixed axially between the two

claw pole plates

22 and 23. For this purpose, the coil carrier 60 is cast with the field winding 51 and the

claw pole plates

22, 23 with a filling resin. Furthermore, the claw-

pole pins

24 and 25 overlap the field winding 51 and thus form a kind of cage radially outward, which avoids an inadmissible radial offset of the field winding 51. The coil carrier 60 has a limiting element 75, which is arranged between the field winding 51 and the claw pole plate 22. Similarly, a limiting element 78 is also provided on the other side of the coil carrier 60, i.e. on the side closer to the slip ring assembly 49. Between the two limiting elements 7578, the coil carrier 60 has a cylindrical shell-like core element which is arranged around the pole core 63 and on which the field winding 51 is accommodated.

A coil support not in accordance with the present invention is shown in fig. 2 and is designated by reference numeral 100. The coil carrier 100 has a core element 150 for receiving an excitation winding. The core element 150 is delimited in the axial direction by two limiting

elements

75, 78. The limiting

elements

75, 78 are each formed with an annular disk and with wing-shaped

elements

751, 781 extending radially outward from the disk.

In this embodiment, each restraining

element

75, 78 has six wing-shaped

elements

751, 781, respectively. The wing-shaped

elements

751, 781 have here a trapezoidal shape, which are mirror-symmetrical with respect to a radial center axis and taper outwards in the radial direction. The limiting

elements

75, 78 have

recesses

752, 782 and projections 783, wherein the projections 783 extend on the disk in the axial direction away from the core element 150. The

recesses

752, 782 extend only over the discs of the limiting

elements

75, 78.

Fig. 3 shows a first embodiment of a coil support 101 according to the invention. The coil carrier 101 according to the invention differs from the embodiment shown in fig. 2 in that it has a

first recess

754, 784 for each wing-shaped

element

751, 781, which extends both in the limiting

elements

75, 78 and in the core element 150. Furthermore, the portion of the

first recess

754, 784 extending in the

aerofoil element

751, 781 extends over a length which is approximately 75% of the radial length of the

aerofoil element

751, 781. The portion of the

first recess

754, 784 extending in the core element extends through a length that is approximately 40% of the axial elongation of the core element 150. In this way, the filling resin is advantageously applied to a large part of the winding area, in particular the area of the field winding that completely rests on the core element, during immersion.

The embodiment shown in fig. 3 and the embodiment shown in fig. 2 also consist in that the coil carrier 101 according to the invention has two second recesses 785 extending in the circumferential direction for each projection 783, which extend away from the projection in the circumferential direction. The second recess 785 extends in the radial direction approximately midway inside the disc. In this way, the filling resin advantageously reaches the gap between the projection 783 and the adjacent recess within the adjacent

claw pole plate

22, 23 during immersion. In addition, the impregnating resin is also allowed to reach the middle region of the field winding during the impregnation.

Fig. 4 shows a second embodiment of a coil support 101 according to the invention. It differs from the embodiment shown in fig. 3 in that the projection 783 is formed on the limiting

elements

75, 78 by two first projections 783a and four second projections 783b, respectively. The first projection 783a is designed in such a way that it can project into the recess of the adjacent

claw pole plate

22, 23 in a form-fitting manner. The second projection 783b has a smaller volume expansion than the first projection 783a, so that it can engage in the recess of the adjacent

claw pole plate

22, 23, so that an intermediate volume remains between the recess and the second projection 785b, into which intermediate volume filling resin can be filled. For this purpose, it can have a smaller extension in the circumferential direction and/or in the radial direction and/or in the axial direction.

Claims

1. A coil carrier (101) for receiving a field winding of a rotor (20) of an electric machine, having a cylinder jacket-like core element (150) for receiving the field winding and having two limiting elements (75, 78) arranged on axial edges of the core element (150),

wherein the two limiting elements (75, 78) are each designed as a disk having an annular shape and as a plurality of wing-shaped elements (751, 781) which project radially outward from the disk,

wherein the coil carrier (101) has at least one first recess (754, 784) for each limiting element (75, 78), which extends in the limiting element (75, 78) and in the core element (150).

2. The coil support (101) according to claim 1, wherein the at least one first recess (754, 784) extends in the disc and in the wing-shaped element (751, 781).

3. The coil support (101) according to claim 2, wherein the portion of the at least one first recess (754, 784) extending in the wing-shaped element extends over a length of about 60% to 95% of the radial length of the wing-shaped element (751, 781).

4. The coil support (101) according to any one of the preceding claims, wherein the portion of the first recess (754, 784) extending in the core element extends over a length in the axial direction of 20% to 50% of the axial elongation of the core element (150).

5. The coil support (101) according to any one of the preceding claims, wherein the coil support (101) has a first recess (754, 784) for each wing-shaped element (751, 781), which extends in the wing-shaped element (751, 781), the disc and the core element (150).

6. The coil support (101) according to any one of the preceding claims, wherein each disc of the limiting element (75, 78) has at least one projection (753, 753a, 753b, 783a, 783b) extending away from said core element (150) in the axial direction.

7. The coil support (101) as claimed in claim 6, wherein at least one first projection (753a), preferably two first projections (753a), is formed on each limiting element (75, 78), so that said first projections can be inserted with a positive fit into recesses on adjacently arrangeable claw plates (22, 23).

8. The coil support (101) as claimed in claim 7, wherein at least one second projection (753b, 783b) is formed on each limiting element (75, 78) in such a way that it has a smaller extension volume than the at least one first projection (753a, 783a) so that it can be inserted into a recess in the adjacently arrangeable claw pole plate (22, 23) in such a way that an intermediate volume remains between the recess and the at least one second projection (753b, 783 b).

9. The coil support (101) according to any one of claims 6 to 8, wherein each disc has a second recess (785) extending in circumferential direction.

10. The coil support (101) as claimed in claim 9, wherein each projection (753, 753a, 753b, 783a, 783b) of the disk of each limiting element (75, 78) has two second recesses (785) which extend away from the projection either adjacent to the projection or in the circumferential direction with a spacing which is less than half the elongation of the projection in the circumferential direction.

11. The coil support (101) according to claim 10, wherein the second recess (785) is arranged in the radial direction in an area of 10% of the radial extension of the disc around the radial center of the disc.

12. Coil support (101) according to any one of the preceding claims, wherein the wing-shaped elements (751, 781) have the shape of an isosceles trapezium mirror-symmetrical with respect to a radial direction.

13. An electrical machine having a rotor (20) which is designed as a claw-pole rotor, wherein the rotor (20) has two claw-pole plates (22, 23) on the outer circumference of which claw-pole pins (24, 25) are arranged, wherein a coil carrier (101) according to one of the preceding claims is arranged between the two claw-pole plates (22, 23).

14. The electrical machine according to claim 13, wherein each limiting element (75, 78) has the same number of wing-shaped elements (751, 781) as the claw-shaped pole pins of the adjacently arranged claw-shaped pole plates (22, 23).

15. The electrical machine according to claim 14, wherein the wing-shaped elements (751) of the first limiting element (75) are arranged offset to each other with respect to the wing-shaped elements (781) of the second limiting element (78) by an angle corresponding to the offset angle of two opposing claw-shaped pole plates (22, 23) arranged in abutment with respect to the coil support (101).