JP7188348B2 - 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 it did, there was a possibility that it would not be possible to stably prevent the coil from being displaced in the circumferential direction for a long period of time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slotless rotating electric machine that can stably prevent the displacement of coils in the circumferential 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 rotating electric machine comprising a stator (15) disposed and an end housing (13) axially covering the stator, wherein the end housing is in contact with the coil end portion in the circumferential direction. A circumferential direction restricting portion (13a) is provided for restricting the movement of the coil in the circumferential direction.

According to this configuration, the end housing is provided with the circumferential direction restricting portion that abuts on the coil end portion in the circumferential direction to restrict the movement of the coil in the circumferential direction. In comparison, it is possible to stably prevent the displacement of the coil in the circumferential direction.

Sectional drawing of the slotless rotary electric machine in one Embodiment. A partial perspective view of a stator in one embodiment. 1 is a partially enlarged cross-sectional view of a slotless rotating electrical machine in one embodiment; FIG. Sectional drawing for demonstrating the coil end part and the circumferential direction control part of one Embodiment. The perspective view of the coil 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 are made of aluminum or stainless metal. The slotless rotating electric machine 11 also includes a substantially cylindrical stator 15 arranged along the inner peripheral surface of the motor housing 12 .

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 . The coil 20 is formed by winding a rectangular wire formed by coating a conductor with enamel a number of times in a ring shape, and the cross section of the rectangular wire is arranged side by side with almost no gap in the cross section of the ring. It is a thing. 1 to 4, illustration of boundaries between rectangular lines is omitted. Both ends of the flat wire in the coil 20 are connected to the 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 in the V-phase second coil 22 in the circumferential direction, there is one axial coil portion 21a in the U-phase first coil 21 and the W-phase first coil portion 22a. 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 of the U phase One axial coil portion 22a in the coil 22 is arranged.

1 to 3, the coil end portion 21b on one side in the axial direction of the first coil 21 serves as an outer coil end portion arranged radially outward, and the coil end portion 21b on 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 and 2, the coil end portion 21c on the other side in the axial direction of the first coil 21 and the coil end portion 22c on the other side in the axial direction of the second coil 22 are arranged side by side in the axial direction. ing.

Here, as shown in FIG. 4, the first end housing 13 has a circumferential direction restricting portion that abuts on the coil end portions 21b and 22b on one side in the axial direction in the circumferential direction to restrict the movement of the coil 20 in the circumferential direction. 13a is provided.

Specifically, first, chamfered portions 31 are formed at both circumferential ends of the axial ends of the coil end portions 21b and 22b. The chamfered portion 31 of this embodiment is formed in a curved R shape. The first end housing 13 is provided with a circumferential restricting portion 13a that protrudes in the axial direction so as to come into surface contact with the chamfered portion 31 in the circumferential direction. The circumferential direction restricting portion 13a is interposed between the chamfered portions 31 that face each other adjacently in the circumferential direction, and is set so as to come into contact with both of the chamfered portions 31 in the circumferential direction.

Further, as shown in FIGS. 1 and 3, the first end housing 13 and the second end housing 14 are in contact with the coil end portions 21b, 21c, 22b, and 22c in the radial direction to prevent the coil 20 from moving in the radial direction. radial direction restricting portions 13b and 14a are provided to restrict the

As shown in FIGS. 1 and 3, the first end housing 13 has a coil end portion 22b as the inner coil end portion and a coil end portion 21b as the outer coil end portion in the radial direction. An intervening portion 13c is provided. The intervening portion 13c abuts on the radially outer side of the coil end portion 22b as the inner coil end portion and the radially inner side of the coil end portion 21b as the outer coil end portion. also serves as part of

Also, the first end housing 13 and the second end housing 14 are set so as to abut on the coil end portions 21b, 21c, 22b, 22c in the axial direction. In other words, the first end housing 13 is formed with an accommodating portion 13d that accommodates the coil end portions 21b and 22b while being in contact with the coil end portions 21b and 22b in the axial, radial and circumferential directions. Further, the second end housing 14 is formed with accommodating portions 14b that accommodate the coil end portions 21c and 22c while being in contact with the coil end portions 21c and 22c in the axial direction and the radial 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 circumferential movement of the coil 20 is restricted by the circumferential direction restricting portion 13a coming into contact with the coil end portions 21b and 22b of the coil 20 in the circumferential direction.

Next, the effects of the above embodiment will be described below.
(1) The first end housing 13 is provided with the circumferential direction restricting portion 13a that contacts the coil end portions 21b and 22b on one axial side in the circumferential direction to restrict the movement of the coil 20 in the circumferential direction. As compared with the case where the coil 20 is fixed to the stator core 18 only with an adhesive, the displacement of the coil 20 in the circumferential direction can be stably prevented for a long period of time.

(2) In the first end housing 13 and the second end housing 14, the radial direction restricting portions 13b, which radially abut against the coil end portions 21b, 21c, 22b, 22c to restrict the radial movement of the coil 20, 14a is provided. Therefore, for example, compared with the case where the coil 20 is fixed to the stator core 18 only with an adhesive, it is possible to stably prevent the radial deviation of the coil 20 for a long period of time.

(3) The first end housing 13 is provided with the intervening portion 13c 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. , the insulation of the coils 20 of different phases can be ensured. That is, it is possible to prevent the inner coil end portion and the outer coil end portion from contacting each other in the radial direction, for example, to damage the enamel coating, and furthermore to prevent them from being electrically connected.

(4) The intervening portion 13c abuts on the radially outer side of the coil end portion 22b as the inner coil end portion and also abuts on the radially inner side of the coil end portion 21b as the outer coil end portion. It also serves as a part of the regulation portion 13b. Therefore, the intervening portion 13c can stably prevent the coils 20 from shifting in the radial direction for a long period of time, and can ensure the insulation of the coils 20 of different phases.

(5) Since the first end housing 13 and the second end housing 14 are made of metal, heat dissipation from the coil end portions 21b, 21c, 22b, 22c is excellent.
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 coil 20 is formed by winding a rectangular wire a number of times in an annular shape, and includes the first coil 21 and the second coil 22 that are bent into two different shapes. However, 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, as shown in FIG. 5, the coil 43 has an axial coil portion 41 extending in the axial direction and a coil end portion 42 that connects the pair of axial coil portions 41 in the circumferential direction. It may also be embodied as a distributed winding by wave winding in which the axial coil portions 41 of the coils 43 of the other phases are arranged between the axial coil portions 41 connected to each other in the circumferential direction. That is, in the slotless rotating electric machine having such a coil 43, the end housing is provided with a circumferential direction restricting portion that abuts on the coil end portion 42 in the circumferential direction to restrict the movement of the coil 43 in the circumferential direction. may

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-described embodiment, the first end housing 13 and the second end housing 14 are provided with radial regulating members that radially abut against the coil end portions 21b, 21c, 22b, and 22c to regulate radial movement of the coil 20. Although the portions 13b and 14a are provided, it is not limited to this, and for example, a configuration in which the radial direction restricting portions 13b and 14a are not provided may be adopted.

In the above-described embodiment, the first end housing 13 is provided with the intervening portion 13c 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. However, it is not limited to this, and for example, a configuration in which the intervening portion 13c is not provided may be adopted.

In addition, although the intervening portion 13c serves as a part of the radial direction restricting portion 13b by contacting the coil end portions 21b and 22b in the radial direction, it is not limited to this. 22b may be set so as not to abut in the radial direction.

- In the above embodiment, the first end housing 13 and the second end housing 14 are made of metal, but are not limited to this, and may be made of resin, for example.
- 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 .

- In the above-described embodiment, the circumferential direction restricting portion 13a is provided on the first end housing 13, but this is not a limitation, and the circumferential direction restricting portion may be provided only on the second end housing 14, It may be provided in the first end housing 13 and the second end housing 14 .

In the above embodiment, the chamfered portions 31 are formed in the coil end portions 21b and 22b, and the circumferential direction restricting portion 13a is in contact with the chamfered portions 31 in the circumferential direction. is not formed, and the circumferential direction restricting portion may be in direct contact with the circumferential end surface of the coil end portion in the circumferential direction.

- Although not specifically mentioned in the above embodiment, the coil 20 may be fixed to the stator core 18 with an adhesive.
Insulating paper, insulating covers, etc. are interposed between the coil end portions 21b, 21c, 22b, 22c and the first end housing 13 and the second end housing 14, although not specifically mentioned in the above embodiment. You may let

DESCRIPTION OF SYMBOLS 11... Slotless rotary electric machine, 13... 1st end housing (end housing), 13a... Circumferential direction regulation part, 13b... Radial direction regulation part, 13c... Interposition part, 15... Stator, 20... Coil, 21... First coil (coil), 22... second coil (coil), 21a, 22a... axial coil portions, 21b, 21c, 22b, 22c... coil end portions.

Claims (5)

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 electrical machine comprising an end housing (13) that axially covers the stator,
A slotless rotary electric machine, wherein the end housing is provided with a circumferential direction restricting portion (13a) that abuts on the coil end portion in the circumferential direction to restrict the movement of the coil in the circumferential direction. 2. The slotless rotary electric machine according to claim 1, wherein the end housing is provided with a radial restriction portion (13b) that radially abuts against the coil end portion and restricts radial movement of 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,
3. The slotless rotary electric machine according to claim 1, wherein the end housing is provided with an intermediate portion (13c) interposed between the inner coil end portion and the outer coil end portion in a radial direction. . 3. The intervening portion according to claim 3, wherein the intermediate portion also serves as the radial restriction portion by contacting the radially outer side of the inner coil end portion and the radially inner side of the outer coil end portion. slotless rotary electric machine. 5. The slotless rotating electric machine according to claim 1, wherein said end housing is made of metal.

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