JP7200904B2 - Slotless rotating electric machine - Google Patents

Description

The present invention relates to a slotless rotating electric machine.

2. Description of the Related Art Conventionally, as a stator for a slotless rotating electric machine, for example, a plurality of coils each having an axial coil portion extending in the axial direction and a coil end portion connecting a pair of axial coil portions in the circumferential direction are provided. There is another type in which an axial coil portion of another phase is arranged between the axial coil portions connected by a portion in the circumferential direction (see, for example, Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2014-121102

However, in the slotless rotating electric machine described above, the teeth of the stator core are not arranged between the axial coil portions in the circumferential direction. Even if this is done, there is a possibility that the looseness of the coil in the axial direction cannot be stably prevented for a long period of time due to peeling of the adhesive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a slotless rotating electric machine that can stably prevent rattling of coils in the axial direction.

A slotless rotating electric machine (11) for solving the above-mentioned problems includes axial coil portions (21a, 22a) extending in the axial direction and coil end portions (21b, 21c, 22b, 22c), and the axial coil portions of the coils of other phases are located between the axial coil portions connected at the coil end portions in the circumferential direction. A slotless rotary electric machine comprising a stator (15) arranged and a housing (H) holding the stator, wherein the housing or fixed members (23, 31) fixed to the housing include: , pressing portions (23c, 23d, 31c) for pressing the coil end portions (21b, 22b) on one side in the axial direction toward the other side in the axial direction; and the coil end portions (21c, 22c) on the other side in the axial direction. and a support portion (14a) for axially abutting and supporting.

According to this configuration, the housing or the fixed member fixed to the housing includes a pressing portion that presses the coil end portion on one axial side toward the other axial side, and the coil on the other axial side. Since the end portion and the support portion that abuts and supports the coil in the axial direction are provided, it is possible to stably prevent rattling of the coil in the axial direction.

Sectional drawing of the slotless rotary electric machine in one Embodiment. 1 is a partial perspective view of a housing and a stator in one embodiment; FIG. 1 is a partially enlarged cross-sectional view of a slotless rotating electrical machine in one embodiment; FIG. 1 is a partially enlarged cross-sectional view of a slotless rotating electrical machine in one embodiment; FIG. FIG. 11 is a partially enlarged cross-sectional view of a slotless rotating electrical machine in another example; FIG. 11 is a partially enlarged cross-sectional view of a slotless rotating electrical machine in another example; FIG. 11 is a partially enlarged cross-sectional view of a slotless rotating electrical machine in another example;

An embodiment of a rotating electric machine will be described below with reference to FIGS. 1 to 4. FIG.
As shown in FIG. 1, the slotless rotating electric machine 11 includes a cylindrical motor housing 12, a first end housing 13 closing one opening of the motor housing 12, and a closing opening of the other side of the motor housing 12. and a second end housing 14 . The motor housing 12, the first end housing 13, and the second end housing 14 constitute the housing H of the slotless rotating electric machine 11, and are made of aluminum-based or stainless-based metal. The slotless rotating electrical machine 11 also includes a substantially cylindrical stator 15 held along the inner peripheral surface of the motor housing 12 in the housing H. As shown in FIG.

The slotless rotary electric machine 11 also includes a rotor 17 rotatably supported inside the stator 15 by the first end housing 13 and the second end housing 14 via bearings 16 .

The rotor 17 includes a rotating shaft 17a supported by bearings 16, a rotor core 17b fitted and fixed to the rotating shaft 17a, and permanent magnets 17c fixed to the outer peripheral surface of the rotor core 17b.

As shown in FIGS. 1 and 2 , the stator 15 includes a cylindrical stator core 18 functioning as part of a magnetic circuit and a plurality of coils 20 arranged along the inner peripheral surface of the stator core 18 .

As shown in FIG. 3, the coil 20 is formed by winding a rectangular wire D1, which is a conductor coated with enamel, many times in a circular shape. The cross sections are arranged side by side with almost no gap. 1, 2 and 4, the boundary between the flat lines D1 is omitted, and only a part of FIG. 3 shows a cross section where the boundary between the flat lines D1 can be seen. Both ends of the flat wire D1 in the coil 20 are connected to a drive circuit, but the illustration of both ends of the flat wire and the drive circuit is omitted in FIGS.

As shown in FIG. 2, the coil 20 of this embodiment includes a first coil 21 and a second coil 22 that are bent into two different shapes. The first coil 21 and the second coil 22 each include a pair of axial coil portions 21a and 22a extending in the axial direction, and coil end portions 21b and 21c connecting the pair of axial coil portions 21a and 22a in the circumferential direction. 22b and 22c.

A coil end portion 21b on one side in the axial direction of the first coil 21 constitutes an outer coil end portion. and a first connecting portion 21f that extends in the circumferential direction and connects the axially extending portions 21e. A coil end portion 21c on the other side in the axial direction of the first coil 21 includes an inner extension portion 21g that extends by bending radially inward from the axial coil portion 21a, and an inner extension portion 21g that extends in the circumferential direction and connects the inner extension portions 21g. and a first other connecting portion 21h.

A coil end portion 22b on one side in the axial direction of the second coil 22 constitutes an inner coil end portion, and extends in the circumferential direction without being bent from the axial coil portion 22a. It has the 2nd one connection part 22d which connects each other. A coil end portion 22c on the other side in the axial direction of the second coil 22 includes an inner extension portion 22e that extends radially inward from the axial coil portion 21a, and an inner extension portion 22e that extends in the circumferential direction and connects the inner extension portions 22e. and a second other connecting portion 22f.

In the stator 15, the axial coil portions 21a and 22a of the coil 20 of the other phase are located between the axial coil portions 21a and 22a connected by the coil end portions 21b, 21c, 22b and 22c in the circumferential direction. are placed. Specifically, first, the first coils 21 and the second coils 22 are alternately arranged while half overlapping in the circumferential direction. Also, the first coils 21 and the second coils 22 arranged in the circumferential direction are allocated so as to repeat the U-phase, V-phase, and W-phase. That is, for example, the reference first coil 21 is the U-phase, the second coil 22 half-overlapping in one circumferential direction is the V-phase, and the second coil 22 half-overlapping in the one circumferential direction is the V-phase. The first coil 21 is W-phase, the second coil 22 half-overlapping in one circumferential direction is U-phase, and the first coil 21 half-overlapping in one circumferential direction is V-phase. , and the second coil 22 half-overlapping on one side in the circumferential direction is the W-phase, and the U-phase, V-phase, and W-phase are assigned so as to repeat this. For example, between the pair of axial coil portions 21a in the U-phase first coil 21 in the circumferential direction, there is one axial coil portion 22a in the V-phase second coil 22 and the W-phase second coil portion 21a. One axial coil portion 22a in the coil 22 is arranged. Further, for example, between the pair of axial coil portions 22a of the V-phase second coil 22 in the circumferential direction, one axial coil portion 21a of the U-phase first coil 21 and the W-phase first coil portion 22a are provided. One axial coil portion 21a in the coil 21 is arranged. Further, for example, between the pair of axial coil portions 21a of the first coil 21 of the W phase in the circumferential direction, one axial coil portion 22a of the second coil 22 of the V phase and the second coil portion 21a of the U phase are provided. One axial coil portion 22a in the coil 22 is arranged.

2 and 3, the coil end portion 21b on one side in the axial direction of the first coil 21 is the outer coil end portion arranged radially outward, and the one side in the axial direction of the second coil 22 The side coil end portion 22b is an inner coil end portion arranged radially inward. That is, the coil end portion 21b on one side in the axial direction of the first coil 21 has an extension portion 21d that is bent and extends radially outward, so that the first one connecting portion 21f is larger in diameter than the second other connecting portion 22f. located on the outside of the direction.

1, 2, and 4, the coil end portion 21c on the other axial side of the first coil 21 and the coil end portion 22c on the other axial side of the second coil 22 are aligned in the axial direction. are placed in

Here, as shown in FIGS. 2 and 3, a fixing member 23 is fixed to the motor housing 12 in the housing H. As shown in FIG. The fixing member 23 is arranged along one axial end surface of the motor housing 12 and has an annular fixing portion 23 a sandwiched between the one axial end surface and the other axial end surface of the first end housing 13 . In addition, the fixing member 23 extends from the radially inner end portion of the fixing portion 23a to one axial side, and extends radially between the coil end portion 22b as the inner coil end portion and the coil end portion 21b as the outer coil end portion. It has an intervening portion 23b interposed therebetween. Interposed portion 23b is provided so as to abut radially outwardly of coil end portion 22b as an inner coil end portion and to abut radially inwardly of coil end portion 21b as an outer coil end portion. Further, the intervening portion 23b extends axially one side through between the outer extension portions 21d of the coil end portion 21b in the circumferential direction, and is provided so as to contact the outer extension portions 21d in the circumferential direction. In addition, the fixing member 23 extends in both radial directions from the distal end of the intervening portion 23b so that the coil end portion 22b as the inner coil end portion and the coil end portion 21b as the outer coil end portion extend toward the other side in the axial direction. It has pressing portions 23c and 23d for pressing.

As shown in FIGS. 1, 2 and 4, the second end housing 14 of the housing H has a support portion 14a which axially abuts and supports the coil end portions 21c and 22c on the other side in the axial direction. is provided. The support portion 14a is the bottom surface of the second end housing 14 and is in direct axial contact with the coil end portion 21c on the other side in the axial direction of the first coil 21, and the second coil 22 is connected through the coil end portion 21c. , indirectly in contact with the coil end portion 22c on the other side in the axial direction to support them.

Further, as shown in FIG. 3, the contact surfaces of the coil end portions 21b and 22b with the pressing portions 23c and 23d are flat surfaces 24. As shown in FIG. The flat surface 24 of the present embodiment is formed by arranging a plurality of flat surfaces of the rectangular wire D1, which is the wire material of the coil 20, in parallel.

As shown in FIGS. 2 and 4, the second end housing 14 radially abuts against the coil end portions 21c and 22c on the other side in the axial direction so as to move the coil end portions 21c and 22c in the radial direction. are provided with the other side radial direction restricting portions 25 and 26 that restrict the More specifically, on the bottom surface of the second end housing 14 and in the vicinity of the support portion 14a, a radially inner end portion of a coil end portion 21c on the other axial side of the first coil 21 protrudes in one axial direction. and the radial direction restricting portion 25 for restricting radially inward movement of the coil end portion 21c. At a position near the support portion 14a on the bottom surface of the second end housing 14, a radially inner end portion of a coil end portion 22c on the other axial side of the second coil 22 protrudes in one axial direction. A radially restricting portion 26 is provided for radially contacting the coil end portion 22c to restrict radially inward movement of the coil end portion 22c. In addition, the other-side radial restricting portions 25 and 26 have ends on one side in the axial direction, which protrude radially outward and contact axially one-side end faces of the coil end portions 21c and 22c in the axial direction to provide coil end coil ends. Claw portions 25a and 26a are provided to restrict movement of the portions 21c and 22c to one side in the axial direction.

Next, the operation of the slotless rotating electrical machine 11 configured as described above will be described.
When a three-phase drive current is supplied to the coils 20 of the stator 15 from the drive circuit, a rotating magnetic field is generated in the stator 15 and the rotor 17 is rotationally driven. Even when the coil 20 is rotationally driven or subjected to vibration, the pressing portions 23c and 23d press the coil 20 toward the supporting portion 14a, thereby preventing the coil 20 from rattling in the axial direction.

Next, the effects of the above embodiment will be described below.
(1) The fixing member 23 fixed to the housing H is provided with pressing portions 23c and 23d for pressing the coil end portions 21b and 22b on one side in the axial direction toward the other side in the axial direction. The housing 14 is provided with a support portion 14a that axially abuts and supports the coil end portions 21c and 22c on the other side in the axial direction. Therefore, rattling of the coil 20 in the axial direction can be stably prevented for a long period of time.

(2) Since the contact surfaces of the coil end portions 21b and 22b with the pressing portions 23c and 23d are flat surfaces 24, the coil end portions 21b and 22b can be favorably pressed by the pressing portions 23c and 23d.

(3) The flat surface 24 is formed by arranging a plurality of planes of the flat wire D1, which is the wire material of the coil 20, in parallel, so that the flat surface 24 can be easily obtained without providing a separate member other than the wire material be able to.

(4) The pressing portions 23c and 23d extend in both radial directions from an intermediate portion 23b interposed between the coil end portion 22b as the inner coil end portion and the coil end portion 21b as the outer coil end portion in the radial direction. to press the coil end portions 21b and 22b toward the other side in the axial direction. Therefore, the insulation of the coils 20 of different phases can be ensured by the intervening portion 23b. That is, the coil end portion 22b as the inner coil end portion and the coil end portion 21b as the outer coil end portion are prevented from coming into contact with each other in the radial direction, for example, causing damage to the enamel coating. connection is prevented. Moreover, the radially extending length of the pressing portions 23c and 23d can be shortened, and the coil end portions 21b and 22b can be stably pressed.

(5) The second end housing 14 includes a radially restricting portion that radially abuts the coil end portions 21c, 22c on the other side in the axial direction to restrict radial movement of the coil end portions 21c, 22c. 25 and 26 are provided, it is possible to stably prevent radial movement of the coil end portions 21c and 22c on the other side in the axial direction.

The above embodiment can be modified and implemented as follows. In addition, this embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
In the above-described embodiment, the fixing member 23 is provided with the intervening portion 23b interposed between the coil end portion 22b as the inner coil end portion and the coil end portion 21b as the outer coil end portion in the radial direction, Although the pressing portions 23c and 23d extend from the intervening portion 23b, the present invention is not limited to this, and other configurations may be adopted.

For example, the fixing member 31 shown in FIG. 5 may be used. The fixing member 31 of this example is disposed along one axial end surface of the motor housing 12 and has an annular fixing portion 31 a sandwiched between the one axial end surface and the other axial end surface of the first end housing 13 . have. Further, the fixed member 31 has an axially extending portion 31b which extends from the fixed portion 31a to one side in the axial direction and which is arranged radially outward of the coil end portion 21b serving as an outer coil end portion. In addition, the fixing member 31 extends radially inward from the distal end of the axially extending portion 31b so that both the coil end portion 22b as the inner coil end portion and the coil end portion 21b as the outer coil end portion are on the other side in the axial direction. It has a pressing portion 31c that presses toward it. As a result, rattling of the coil 20 in the axial direction can be stably prevented for a long period of time.

In this example (see FIG. 5), the fixing member 31 extends from the pressing portion 31c and radially abuts the coil end portion 22b on one side in the axial direction to prevent the radial movement of the coil end portion 22b. It has a one-side radial direction restricting portion 31d for restricting. As a result, radial movement of the coil end portion 22b on one side in the axial direction can be stably prevented.

In the above-described embodiment, the flat surface 24, which is the contact surface of the coil end portions 21b and 22b with the pressing portions 23c and 23d, is configured by arranging a plurality of flat wires D1, which are the wire members forming the coil 20, in parallel. However, it is not limited to this, and other configurations may be adopted.

For example, as shown in FIG. 6 , the flat surface 41 may be configured by impregnating an impregnating member 43 between a plurality of wire rods 42 forming the coil 20 . That is, the plurality of wires 42 constituting the coil 20 of this example are round wires with a circular cross section, and an impregnating member 43 such as a resin material is impregnated between the wires 42 and cured. The impregnated member 43 forms a flat surface 41 without unevenness on the contact surface with the pressing portions 23c and 23d. By doing so, a stable flat surface 41 can be obtained.

Further, for example, as shown in FIG. 7 , the flat surface 51 may be configured by a cover member 52 that covers the plurality of wire rods 42 that configure the coil 20 . That is, the plurality of wires 42 constituting the coil 20 of this example are round wires having a circular cross section, and gaps are generated between the wires 42, but the plurality of wires 42 are grouped together so that the gaps are not exposed. The contact surface with the pressing portions 23c and 23d is formed as a flat surface 51 without unevenness by the surface of the cover member 52 for covering. Even in this way, a stable flat surface 51 can be obtained.

Further, the contact surfaces of the coil end portions 21b and 22b with the pressing portions 23c and 23d do not have to be flat surfaces 24, 41 and 51, respectively.
Moreover, regardless of whether the contact surfaces with the pressing portions 23c and 23d are the flat surfaces 24, 41, and 51, the coil 20 preferably has a structure in which at least the wire rods at the coil end portions are less likely to come apart. For example, in the coil 20 using the flat wire D1 of the above embodiment, as in the other example (see FIG. 6), the gaps between the flat wires D1 in the coil end portions 21b and 22b are impregnated with the impregnation member. and the coil end portions 21b and 22b may be molded to prevent the rectangular wire D1 from coming loose. Further, for example, in the coil 20 using the flat wire D1 of the above embodiment, as in the other example (see FIG. 7), a cover member is provided to cover the coil end portions 21b and 22b. It is good also as a structure which is hard to come apart. In this way, the wire rods at the coil end portions are less likely to come loose, so that rattling of the coil 20 in the axial direction can be stably prevented for a long period of time.

In the above-described embodiment, the second end housing 14 has the other side diameter that radially contacts the coil end portions 21c and 22c on the other side in the axial direction to restrict the radial movement of the coil end portions 21c and 22c. Although the direction restricting portions 25 and 26 are provided, this is not a limitation, and at least one of the other side radial direction restricting portions 25 and 26 may be omitted.

Further, although the claw portions 25a and 26a are provided on the other-side radial direction restricting portions 25 and 26, the configuration is not limited to this, and at least one of the claw portions 25a and 26a may be removed.

- In the above-described embodiment, the pressing portions 23c and 23d are provided on the fixed member 23 fixed to the housing H. However, they may be provided directly on the housing H, for example. Specifically, for example, the housing H may be integrally formed with the first end housing 13 . Also, although the support portion 14a is provided on the second end housing 14, it is not limited to this, and may be provided on any fixed member fixed to the housing H. FIG.

- In the above embodiment, the coil 20 includes the first coil 21 and the second coil 22 that are bent into two different shapes, but other coils may be used. That is, a coil having an axial coil portion extending in the axial direction and a coil end portion connecting the pair of axial coil portions in the circumferential direction, wherein the axial coil portions connected at the coil end portion are circumferentially connected to each other. Any coil for a slotless rotating electric machine in which an axial coil portion of a coil of another phase is arranged between the directions may be changed. For example, it may be embodied as a coil with wave winding and distributed winding.

Also, the shapes of the coil end portions 21b, 21c, 22b, and 22c in the above embodiment may be changed. For example, the shape of the coil end portions 21c, 22c on the other side in the axial direction may be the same as the shape of the coil end portions 21b, 22b on the one side in the axial direction.

- In the above embodiment, the first end housing 13 and the second end housing 14 are separated from the motor housing 12, but the present invention is not limited to this, and either the first end housing 13 or the second end housing 14 can be used. One of them may be integrated with the motor housing 12 .

- Although not specifically mentioned in the above embodiment, the coil 20 may be fixed to the stator core 18 with an adhesive.
Insulating paper or the like is provided between the coil end portions 21b, 22b and the pressing portions 23c, 23d and between the coil end portions 21c, 22c and the support portion 14a, although not specifically mentioned in the above embodiment. An insulating member may be interposed.

DESCRIPTION OF SYMBOLS 11... Slotless rotary electric machine 14a... Support part 15... Stator 20... Coil 21... First coil (coil) 22... Second coil (coil) 21a, 22a... Axial coil part 21b, 21c , 22b, 22c... Coil end portion 23, 31... Fixed member 23b... Interposed portion 23c, 23d, 31c... Pressing portion 24, 41, 51... Flat surface 25, 26... Other side radial direction restricting portion, 31d... One side radial direction restricting part 42... Wire rod 43... Impregnated member 52... Cover member D1... Rectangular wire H... Housing.

Claims (8)

Coils (20 to 22) having axial coil portions (21a, 22a) extending in the axial direction and coil end portions (21b, 21c, 22b, 22c) connecting the pair of axial coil portions in the circumferential direction a stator (15) in which the axial coil portions of the coils of other phases are arranged between the axial coil portions connected at the coil end portions in the circumferential direction;
A slotless rotating electric machine comprising a housing (H) that holds the stator,
The housing or fixing members (23, 31) fixed to the housing have pressing portions (23c, 23c, 23c, 23c) that press the coil end portions (21b, 22b) on one side in the axial direction toward the other side in the axial direction. 23d, 31c) and a support portion (14a) axially abutting and supporting the coil end portions (21c, 22c) on the other side in the axial direction. 2. The slotless rotary electric machine according to claim 1, wherein a contact surface of said coil end portion with said pressing portion is a flat surface (24, 41, 51). 3. The slotless rotary electric machine according to claim 2, wherein the flat surface (24) is formed by arranging a plurality of flat surfaces of flat wire (D1), which is a wire constituting the coil, in parallel. 3. The slotless rotating electric machine according to claim 2, wherein the flat surface (41) is formed by impregnating an impregnating member (43) between a plurality of wire rods (42) forming the coil. 3. The slotless rotating electric machine according to claim 2, wherein the flat surface (51) is configured by a cover member (52) covering a plurality of wires (42) forming the coil. The coil end portion includes an inner coil end portion (22b) arranged radially inward and an outer coil end portion (21b) arranged radially outward of the inner coil end portion,
The pressing portions (23c, 23d) extend in both radial directions from an intermediate portion (23b) interposed between the inner coil end portion and the outer coil end portion in the radial direction to 3. The slotless rotary electric machine according to claim 1, wherein the outer coil end portions are pressed toward the other side in the axial direction. A one-side radial direction restricting portion (31d) extending from the pressing portion (31c) and radially abutting the coil end portion (22b) on one axial side to restrict the radial movement of the coil end portion. 7. The slotless rotating electrical machine according to any one of claims 1 to 6, comprising: The housing or a fixed member fixed to the housing includes a radially restricting portion on the other side that radially abuts the coil end portion on the other side in the axial direction to restrict radial movement of the coil end portion. 8. The slotless rotating electrical machine according to any one of claims 1 to 7, wherein (25, 26) are provided.

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