JP2022178242A - stator and motor - Google Patents

Abstract

To provide a stator and a motor in which an insulation distance between a plurality of lead-out sections can be easily ensured.SOLUTION: A stator 12 includes: a stator core 14 having a plurality of teeth 17 arranged in a circumferential direction; and a plurality of coils 15 wound around the respective teeth. Each of the coils 15 includes: a coil main body section 20 formed by winding a coated conductive wire around the tooth 17; a first lead-out section 21 led out from the coil main body section 20 toward one end in an axial direction of the stator core 14; and a second lead-out section 22 led out from the coil main body section 20 toward the other end in the axial direction of the stator core 14.SELECTED DRAWING: Figure 2

Description

The present invention relates to stators and motors.

For example, the stator of the motor disclosed in Patent Document 1 includes a stator core having a plurality of teeth arranged in the circumferential direction, and coils wound around the teeth. Each coil has a coil main body formed by winding a coated conductive wire around teeth, and a lead-out portion formed by leading a portion of the coated conductive wire from the coil main body. The lead-out portion is for electrical connection between coils, for example.

Japanese Patent No. 6208702

The present inventors have studied a structure that facilitates ensuring the insulation distance between lead-out portions led out from each coil. SUMMARY OF THE INVENTION An object of the present invention is to provide a stator and a motor that make it easier to secure an insulation distance between a plurality of lead-out portions.

A stator for solving the above problems includes a stator core (14) having a plurality of teeth (17) arranged in a circumferential direction, and a plurality of coils (15) wound around the plurality of teeth, wherein the plurality of Each of the coils is composed of a coated conductive wire (C), and each of the plurality of coils includes a coil main body (20) formed by winding the coated conductive wire around the teeth, and the coil main body a first lead-out portion (21) led out from the stator core to one axial direction side of the stator core; and a second lead-out portion (22) led out from the coil body portion to the other axial direction side of the stator core. is doing.

A motor for solving the above problems is a motor (10) comprising a stator (12) and a rotor (13) facing the stator, wherein the stator has a plurality of teeth (17) arranged in a circumferential direction. and a plurality of coils (15) wound around the plurality of teeth, each of the plurality of coils being composed of a coated conductive wire (C), the plurality of Each of the coils includes a coil main body portion (20) formed by winding the coated conductive wire around the teeth, and a first lead-out portion (21) led out from the coil main body portion to one axial side of the stator core. ) and a second lead-out portion (22) led out from the coil body portion to the other side in the axial direction of the stator core.

According to the stator and motor described above, the plurality of lead-out portions of the coil are divided into one side and the other side in the axial direction of the stator core. For this reason, it becomes possible to easily secure the insulating distance between the plurality of lead-out portions.

FIG. 2 is a schematic diagram of the motor of the embodiment viewed from the axial direction; FIG. 2 is an end view on line 2-2 in FIG. 1; The connection diagram of the coil in the same form. The connection diagram of the coil in the same form. The top view which shows the series connection part in the same form. The side view which shows the series connection part in the same form. The schematic diagram which looked at the tooth in which the coil was wound in the same form from the circumferential direction side. The top view which shows the bus-bar holder in the example of a change. The side view which shows the series connection part in a modification. The side view which shows the series connection part in a modification. The end view of the motor in the example of a change. The connection diagram of the coil of the same phase in the example of a change.

An embodiment of the motor will be described below with reference to the drawings. In each drawing, part of the configuration may be exaggerated or simplified for convenience of explanation. Also, the dimensional ratio of each part may differ in each drawing.

As shown in FIG. 1, the motor 10 includes a housing 11, a stator 12 and a rotor 13. The stator 12 is fixed inside the housing 11 . The housing 11 is made of metal, for example. The stator 12 has an annular shape. The rotor 13 is arranged inside the stator 12, for example. That is, the motor 10 is an inner rotor type motor. The rotor 13 is rotatably supported by the housing 11 .

The stator 12 includes a stator core 14 and coils 15 . The stator core 14 is made of a magnetic metal material. For example, the stator core 14 is configured by laminating a plurality of electromagnetic steel sheets. Stator core 14 has a base portion 16 and a plurality of teeth 17 . The base 16 has an annular shape. The outer peripheral surface of the base 16 is in contact with the inner peripheral surface of the housing 11, for example.

Twelve teeth 17 are provided, for example. The teeth 17 are, for example, arranged at equal intervals in the circumferential direction. Each tooth 17 extends radially from the base 16 . Each tooth 17 extends from the inner peripheral surface of the base portion 16 toward the central axis L of the stator core 14, for example. Each tooth 17 has a facing surface 17 a that faces the rotor 13 . In this embodiment, the radially inner side surfaces of the teeth 17 constitute the opposing surfaces 17a.

As shown in FIGS. 5 and 7, the coil 15 is composed of a coated conducting wire C. As shown in FIG. The coated conducting wire C has an insulating coating applied to the surface of the conducting wire. The coil 15 has a coil main body portion 20 formed by winding a coated conductive wire C around teeth 17 . In addition, the coil 15 has a first lead-out portion 21 led out from the coil body portion 20, as shown in FIGS. In addition, the coil 15 has a second lead-out portion 22 led out from the coil body portion 20 . Each of the first lead-out portion 21 and the second lead-out portion 22 is a part of the coated conducting wire C that constitutes the coil body portion 20 . The first lead-out portion 21 is led out on one axial side of the stator core 14 . The second lead-out portion 22 is led out on the other axial side of the stator core 14 . One axial side of the stator core 14 is the lower side in FIG. 2, and the other axial side of the stator core 14 is the upper side in FIG.

The coil main body 20 is wound around each tooth 17 when viewed from the radial direction. The coil body portion 20 has a coil end portion 15a and an axial coil portion 15b. The axial coil portions 15b are positioned on both sides of the teeth 17 in the circumferential direction. Each axial coil portion 15 b extends axially along the teeth 17 . The coil end portion 15a connects the pair of axial coil portions 15b in the circumferential direction. The coil end portions 15a are located on both axial sides of the teeth 17, respectively. The first lead-out portion 21 is led out from one coil end portion 15a, and the second lead-out portion 22 is led out from the other coil end portion 15a. An insulating member (not shown) is interposed between the coil end portion 15 a and the axial side surface of the tooth 17 . The insulating member is made of, for example, a resin film.

As shown in FIG. 7, the axial coil portion 15b has a lane change portion 15c. The lane change portion 15c is provided on one of the pair of axial coil portions 15b. At the lane change portion 15c, each coated conducting wire C is displaced to the adjacent lane in the radial direction. In the other axial coil portion 15b, which is not provided with the lane change portion 15c, and in each coil end portion 15a, the coated conductor C is arranged so as not to be displaced in the radial direction.

As a method of forming the coil 15 , for example, a method of winding the coil 15 around a jig imitating the tooth 17 to form the coil 15 and then inserting the coil 15 removed from the jig into the tooth 17 can be used. Alternatively, for example, a method of winding the coil 15 around the teeth 17 may be used. When power is supplied to each coil 15 , a rotating magnetic field for rotating the rotor 13 is generated in the stator 12 .

As shown in FIGS. 1 and 3, the coil 15 is wound around each tooth 17 by concentrated winding, for example. Twelve coils 15 are provided because they are provided for each tooth 17 . The 12 coils 15 include four U-phase coils "U1" to "U4", four V-phase coils "V1" to "V4", and four W-phase coils "W1" to "W4". It has become. A U-phase drive current is supplied to the U-phase coils “U1” to “U4”. A V-phase drive current is supplied to the V-phase coils “V1” to “V4”. A W-phase drive current is supplied to the W-phase coils “W1” to “W4”. The U-phase drive current, the V-phase drive current and the W-phase drive current have a phase difference of 120° with each other.

The coils 15 are arranged, for example, in the clockwise direction from the arrangement position of the U-phase coil "U1", U-phase coil "U2", V-phase coil "V1", V-phase coil "V2", W-phase coil "W1", W-phase coil Description order of phase coil "W2", U-phase coil "U3", U-phase coil "U4", V-phase coil "V3", V-phase coil "V4", W-phase coil "W3", W-phase coil "W4" is arranged. Note that the arrangement of the coils 15 for each phase is an example, and can be changed as appropriate according to the configuration of the motor 10 .

As a connection mode of the coil 15, for example, a star connection is adopted as shown in FIG.
In the U-phase, a U-phase coil "U1" and a U-phase coil "U2" are connected in series. A U-phase coil "U3" and a U-phase coil "U4" are connected in series. U-phase coils “U1” and “U2” connected in series and U-phase coils “U3” and “U4” are connected in parallel.

In the V-phase, a V-phase coil "V1" and a V-phase coil "V2" are connected in series. A V-phase coil "V3" and a V-phase coil "V4" are connected in series. In addition, series-connected V-phase coils “V1” and “V2” and V-phase coils “V3” and “V4” are connected in parallel.

In the W-phase, a W-phase coil "W1" and a W-phase coil "W2" are connected in series. A W-phase coil "W3" and a W-phase coil "W4" are connected in series. In addition, W-phase coils "W1" and "W2" connected in series and W-phase coils "W3" and "W4" are connected in parallel.

As shown in FIGS. 3 and 4 , the stator 12 includes a plurality of serial connections 31 and neutral point connections 32 .
Each series connection portion 31 connects a pair of coils 15 having the same phase among the plurality of coils 15 in series. Each series connection portion 31 connects, for example, a pair of coils 15 adjacent in the circumferential direction in series. Also, the series connection portion 31 connects the first lead-out portions 21 of the coils 15 in phase.

Specifically, in the U-phase, the series connection section 31 connects the first lead-out section 21 of the U-phase coil "U1" and the first lead-out section 21 of the U-phase coil "U2" in series. The series connection portion 31 connects the first lead-out portion 21 of the U-phase coil "U3" and the first lead-out portion 21 of the U-phase coil "U4" in series. In the V-phase, the series connection section 31 connects the first lead-out section 21 of the V-phase coil "V1" and the first lead-out section 21 of the V-phase coil "V2" in series. The series connection portion 31 connects the first lead-out portion 21 of the V-phase coil "V3" and the first lead-out portion 21 of the V-phase coil "V4" in series. In the W-phase, the series connection section 31 connects the first lead-out section 21 of the W-phase coil "W1" and the first lead-out section 21 of the W-phase coil "W2" in series. The series connection portion 31 connects the first lead-out portion 21 of the W-phase coil "W3" and the first lead-out portion 21 of the W-phase coil "W4" in series. All the serially connected portions 31 are arranged on one axial side of the stator core 14 .

As shown in FIGS. 5 and 6, the pair of coils 15 connected at the series connection portion 31 is composed of, for example, coated conductive wires C that are separate from each other. The series connection portion 31 is composed of, for example, a coated conductive wire that is separate from each coated conductive wire C that constitutes the pair of coils 15 . In addition, as long as the coated conducting wire constituting the series connection portion 31 and the coated conducting wire C constituting the coil 15 are separate from each other, the cross-sectional shape, cross-sectional dimensions and material are the same. A wire may be used. Alternatively, a coated conductive wire that is different from the coated conductive wire C in at least one of the cross-sectional shape, cross-sectional dimensions, and material may be used as the coated conductive wire that constitutes the series connection portion 31 . As a connection mode between the series connection portion 31 and the first lead-out portion 21, for example, in each of the first lead-out portion 21 and the series connection portion 31, after part of the insulating coating is peeled off, the insulating coating is peeled off. are connected by ultrasonic welding or the like. In the above description, each of the first lead-out portions 21 and the series connection portion 31 of the pair of coils 15 has an insulating coating on the wire surface, but the present invention is not limited to this. In other words, each of the first lead-out portions 21 and the series connection portion 31 of the pair of coils 15 may be a conductive wire whose surface is not coated with an insulating coating. In this case, it is desirable to adopt a configuration in which insulation between lines is ensured by, for example, a partition wall made of an insulator.

As shown in FIG. 3 , the neutral point connecting portion 32 connects the coils 15 that are out of phase with each other among the plurality of coils 15 . The neutral point connecting portion 32 is, for example, a bus bar produced by punching a conductive metal plate into a predetermined shape. The neutral point connecting portion 32 is arranged on the other axial side of the stator core 14 . That is, in the axial direction of the stator core 14 , the neutral point connection portion 32 is arranged on the side opposite to the plurality of series connection portions 31 .

The neutral point connecting portion 32 connects the second lead-out portions 22 to each other. Specifically, the neutral point connecting portion 32 includes a U-phase coil "U2", a V-phase coil "V2", a W-phase coil "W2", a U-phase coil "U4", a V-phase coil "V4", and a W-phase coil " W4" are connected to each other.

The stator 12 has three power connections 33 , 34 , 35 . Each of the power connection portions 33, 34, and 35 is, for example, a bus bar, and is produced by punching out a conductive metal plate into a predetermined shape.

The power connection portion 33 corresponds to the U phase. That is, the power supply connection portion 33 connects the second lead-out portions 22 of the U-phase coil "U1" and the U-phase coil "U3". The power supply connection unit 33 is electrically connected to a drive current generation circuit (not shown), and the circuit supplies the power supply connection unit 33 with a U-phase drive current.

The power connection portion 34 corresponds to the V phase. That is, the power supply connection portion 34 connects the second lead-out portions 22 of the V-phase coil "V1" and the V-phase coil "V3". The power supply connection section 34 is electrically connected to a drive current generation circuit (not shown), and the circuit supplies the power supply connection section 34 with a V-phase drive current.

The power connection part 35 corresponds to the W phase. That is, the power supply connection portion 35 connects the second lead-out portions 22 of the W-phase coil "W1" and the W-phase coil "W3". The power connection unit 35 is electrically connected to a drive current generation circuit (not shown), and the W-phase drive current is supplied from the circuit to the power connection unit 35 .

As shown in FIG. 2 , the stator 12 includes a heat transfer member 41 and a busbar holder 42 at the other axial end of the stator core 14 . The busbar holder 42 holds the neutral point connecting portion 32 as a second busbar. 1, illustration of the heat transfer member 41, the busbar holder 42, and the neutral point connecting portion 32 is omitted.

The heat transfer member 41 is a member for facilitating release of heat generated in the coil 15 . An insulating member (not shown) is interposed between the heat transfer member 41 and the coil end portion 15a. The insulating member provides electrical insulation between the heat transfer member 41 and the coil end portion 15a. Note that the insulating member arranged between the heat transfer member 41 and the coil end portion 15a is not necessarily required. An impregnating material made of, for example, epoxy resin may be provided on the surface of the coil end portion 15a.

The heat transfer member 41 is made of, for example, a material having a higher thermal conductivity than the material of the stator core 14 . In this embodiment, the heat transfer member 41 is made of a material having a higher thermal conductivity than the electromagnetic steel sheets that make up the stator core 14 . Also, the heat transfer member 41 is made of, for example, a conductor. The heat transfer member 41 is made of, for example, an aluminum-based metal.

The heat transfer member 41 faces the side surface of the coil end portion 15 a opposite to the side facing the tooth 17 . The insulating member interposed between the heat transfer member 41 and the coil end portion 15a is in contact with each of the heat transfer member 41 and the coil end portion 15a. As a result, the heat of the coil end portion 15a can be easily transferred to the heat transfer member 41 while the insulating member is interposed between the heat transfer member 41 and the coil end portion 15a. The heat transfer member 41 is fixed to, for example, an axial side surface of the stator core 14 . When the drive current is supplied to each coil 15 , heat is generated in the coil 15 . At this time, part of the heat of the coil 15 is transferred to the stator core 14 via the heat transfer member 41 . The heat transmitted to the stator core 14 is transmitted to the housing 11 . The heat transferred to the housing 11 is released from the housing 11 to the outside of the motor 10 .

The busbar holder 42 is supported, for example, on the axial side surface of the heat transfer member 41 . The busbar holder 42 is made of an insulator such as synthetic resin. The busbar holder 42 is integrated with the heat transfer member 41, for example. That is, the heat transfer member 41 and the busbar holder 42 are configured as an integrally molded product. The busbar holder 42 is formed integrally with the heat transfer member 41 by insert molding, for example.

A second lead-out portion 22 of each coil 15 is led out to the heat transfer member 41 side. Further, the second lead-out portion 22 is led out from the coil end portion 15a side with respect to the heat transfer member 41 toward the busbar holder 42 side.

The neutral point connection portion 32 has an extension portion 43 extending from the busbar holder 42 to the outside thereof. A second lead-out portion 22 of the corresponding coil 15 is connected to the extension portion 43 . In addition, as a connection mode between the extension part 43 and the second lead-out part 22, for example, after part of the insulating coating of the second lead-out part 22 is peeled off, the part from which the insulating coating is peeled off is connected to the extension part 43. Connected.

The extending portion 43 is provided with, for example, an insulator 44 that covers the connecting portion with the second lead-out portion 22 . The insulator 44 is made of, for example, an epoxy-based resin applied to the extending portion 43 . The insulator 44 prevents the extension 43 from being exposed.

In this embodiment, the power connection portions 33 , 34 , 35 are held by a busbar holder 42 . It has an extension portion (not shown) similar to the extension portion 43 of the neutral point connection portion 32 . The second lead-out portion 22 of the corresponding coil 15 is connected to the extension portion of each power supply connection portion 33 , 34 , 35 . Insulators similar to the insulator 44 are also applied to the connecting portions of the extensions of the power supply connection portions 33 , 34 , 35 and the second lead-out portion 22 .

The operation of this embodiment will be described.
The stator 12 has a total of six series connection portions 31 that connect the in-phase coils 15 in series. All the six serially connected portions 31 are arranged on one side of the stator core 14 in the axial direction. Further, the neutral point connection portion 32 and the power supply connection portions 33 , 34 , 35 of the respective phases are arranged on the other axial side of the stator core 14 . This makes it easier to secure a space for arranging the series connection portions 31 on one side of the stator core 14 in the axial direction. Furthermore, on the other side of the stator core 14 in the axial direction, it becomes easier to secure the arrangement space for the neutral point connection portion 32 and the power supply connection portions 33, 34, and 35 of each phase. As a result, it is possible to ensure the insulation of the wire connection portions of the coils 15 on both sides of the stator core 14 in the axial direction without increasing the size of the stator 12 in the axial direction.

Effects of the present embodiment will be described.
(1) Each coil 15 includes a coil body portion 20 , a first lead-out portion 21 and a second lead-out portion 22 . The first lead-out portion 21 is led out from the coil main body portion 20 to one axial direction side of the stator core 14 . The second lead-out portion 22 is led out from the coil body portion 20 to the other side in the axial direction of the stator core 14 . According to this configuration, in each coil 15 , the first lead-out portion 21 and the second lead-out portion 22 are divided into one side and the other side of the stator core 14 in the axial direction. Therefore, it is possible to easily secure the insulation distance between the plurality of lead-out portions 21 and 22 .

(2) The stator 12 includes a plurality of series connection portions 31 that connect in series a pair of coils 15 having the same phase among the plurality of coils 15 . According to this configuration, the coils 15 of the same phase can be connected in series by the series connection portion 31 .

(3) All the series connection portions 31 connect the first lead-out portions 21 and are arranged on one side of the stator core 14 in the axial direction. According to this configuration, by arranging all the series connection portions 31 on one side of the stator core 14 in the axial direction, it becomes easier to secure the insulation distance between the second lead-out portions 22 on the other side of the stator core 14 in the axial direction.

(4) Each of the series connection portions 31 connects a pair of coils 15 adjacent in the circumferential direction in series. According to this configuration, it is possible to reduce the length of each series connection portion 31 in the circumferential direction. This can contribute to miniaturization and weight reduction of the motor 10 . In addition, by reducing the length of each series connection portion 31 in the circumferential direction, it becomes easier to ensure the insulation distance between the series connection portions 31 .

(5) The pair of coils 15 connected at the series connection portion 31 are composed of separate coated conductive wires. The series connection portion 31 is composed of a coated conductive wire that is separate from each coated conductive wire that constitutes the pair of coils 15 . According to this configuration, the first lead-out portions 21 can be connected to each other by the series connection portion 31 made of the coated conductive wire. A coated conductor has an insulating coating applied to the surface of the conductor. Therefore, it is not necessary to separately provide an insulator for insulating the series connection portions 31 on one side of the stator core 14 in the axial direction. Therefore, it is possible to suppress an increase in the number of parts. Furthermore, it becomes possible to suppress the increase in size of the stator 12 in the axial direction due to the provision of the insulator.

(6) The stator 12 has a neutral point connecting portion 32 that connects the coils 15 that are out of phase with each other among the plurality of coils 15 . The neutral point connecting portion 32 connects the second lead-out portions 22 and is arranged on the other side in the axial direction. According to this configuration, the series connection portion 31 can be arranged on one side of the stator core 14 in the axial direction, and the neutral point connection portion 32 can be arranged on the other side of the stator core 14 in the axial direction. Thereby, insulation between the series connection portion 31 and the neutral point connection portion 32 can be ensured. In addition, by arranging the neutral point connection portion 32 on the opposite side of each series connection portion 31 in the axial direction, a space for arranging the plurality of series connection portions 31 is secured on one side of the stator core 14 in the axial direction. Cheap. Therefore, it becomes easier to ensure the insulation distance between the plurality of series connection portions 31 .

(7) The stator 12 includes a busbar holder 42 having insulating properties, and the neutral point connecting portion 32 as a plate-shaped second busbar held by the busbar holder 42 . According to this configuration, the second lead-out portions 22 can be connected to each other by the neutral point connection portion 32 as the second bus bar.

(8) The coil body portion 20 has a pair of axial coil portions 15b extending in the axial direction along the teeth 17, and a coil end portion 15a connecting the pair of axial coil portions 15b in the circumferential direction. ing. The axial coil portion 15b has a lane change portion 15c in which the coated conductive wire C constituting the coil main body portion 20 is arranged while being displaced in the radial direction. Thus, when the lane change portion 15c is set to the axial coil portion 15b, compared to a stator in which the coil lead-out portion is provided only on one side in the axial direction, the first lead-out portion 21 and the second lead-out portion 21 are provided on both sides in the axial direction. The stator 12 having the lead-out portion 22 allows a larger number of coated conductive wires C of the coil 15 to be arranged in the empty spaces in the slots. Thereby, it can contribute to the improvement of the occupancy rate of each coil 15 . As a result, the output performance of the motor 10 can be improved.

(9) The extending portion 43 of the neutral point connecting portion 32 is provided with an insulator 44 that covers the connecting portion with the second lead-out portion 22 . According to this configuration, the insulator 44 prevents the extending portion 43 from being exposed. Therefore, it is possible to insulate the extending portion 43 with the insulator 44 .

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- In the above-described embodiment, the neutral point connection portion 32 and the power supply connection portions 33, 34, and 35 are configured by bus bars. 34 and 35 may be composed of coated conductors.

- For example, as shown in FIG. 8, the insulating wall 42a which insulates between 2nd derivation|leading-out parts 22 comrades may be provided. The insulating wall 42a is provided integrally with the busbar holder 42, for example. The insulating wall 42 a is located on the side in the circumferential direction of the connecting portion between the second lead-out portion 22 and the extension portion 43 of the neutral point connecting portion 32 . Moreover, the insulating wall 42a is positioned on the circumferential side of each connection point between the second lead-out portion 22 and the power supply connection portions 33, 34, and 35. As shown in FIG. According to such a configuration, it is possible to insulate the second lead-out portions 22 from each other by the insulating wall 42a. In the stator 12 of the above-described embodiment, by arranging all the series connection portions 31 on one side of the stator core 14 in the axial direction, it is easy to secure the insulation distance between the second lead-out portions 22 on the other side of the stator core 14 in the axial direction. It's becoming That is, it is easy to secure a space for arranging the insulating wall 42a, and the insulating wall 42a can be provided without difficulty. In addition, the insulating wall 42 a may be formed separately from the busbar holder 42 . Further, for example, when the series connection portion 31 is configured by a bus bar, an insulating wall may be provided to insulate the first lead-out portions 21 from each other.

- The configuration of the series connection portion 31 is not limited to the above-described embodiment, and can be changed as appropriate according to the configuration of the stator 12 .
For example, it may be changed to a series connection portion 31a as shown in FIG. The series connection portion 31a is formed by directly connecting the coated conductive wires C constituting the pair of coils 15 to each other. That is, in the series connection portion 31a, the first lead-out portions 21 are connected to each other. According to such a configuration, it is not necessary to separately prepare a coated conductive wire for connecting the first lead-out portions 21 to each other. As a result, the weight of the motor 10 can be reduced. Also, the number of joints in the series connection portion 31a can be reduced. As a result, it is possible to contribute to the simplification of manufacturing the stator 12 . In addition, as a connection mode between the first lead-out portions 21, for example, in each of the pair of first lead-out portions 21, after part of the insulating coating is peeled off, the portion from which the insulating coating is peeled off is welded by ultrasonic welding or the like. Connecting.

Further, for example, the serial connection portion 31b as shown in FIG. 10 may be used. In the configuration shown in the figure, the pair of coils 15 connected at the series connection portion 31b is composed of one coated conductive wire C. As shown in FIG. The series connection portion 31b is a portion of the coated conducting wire C that constitutes the pair of coils 15. As shown in FIG. That is, the pair of coils 15 is formed by continuously winding one coated conductive wire C. As shown in FIG. According to this configuration, it is not necessary to separately prepare a coated conductive wire for connecting the first lead-out portions 21 to each other. As a result, the weight of the motor 10 can be reduced. In addition, it is possible to omit the process of joining separate coated conductive wires to each other at the series connection portion 31b where the first lead-out portions 21 are connected to each other. As a result, it is possible to contribute to the simplification of manufacturing the stator 12 .

Further, for example, the series connection portion 31c as shown in FIG. 11 may be used. The series connection portion 31c is, for example, a bus bar produced by punching a conductive metal plate into a predetermined shape. A heat transfer member 45 and a busbar holder 46 made of an insulator are provided on one side of the stator core 14 in the axial direction. The heat transfer member 45 and the busbar holder 46 have, for example, the same configurations as the heat transfer member 41 and the busbar holder 42 provided on the other axial side of the stator core 14 . The busbar holder 46 holds a series connection portion 31c as a first busbar.

In the configuration shown in FIG. 11, the first lead-out portion 21 of each coil 15 is led out to the heat transfer member 45 side. Further, the first lead-out portion 21 is led out from the coil end portion 15a side with respect to the heat transfer member 45 toward the busbar holder 46 side.

The series connection portion 31 c has an extension portion 47 like the neutral point connection portion 32 . The extending portion 47 extends from the busbar holder 46 to the outside thereof. The first lead-out portion 21 of the corresponding coil 15 is connected to the extension portion 47 . As a connection mode between the extension part 47 and the first lead-out part 21 , for example, after part of the insulating coating of the first lead-out part 21 is peeled off, the part from which the insulating coating is peeled off is connected to the extension part 47 . Connected. The extending portion 47 is provided with, for example, an insulator 48 that covers the connecting portion with the first lead-out portion 21 . The insulator 48 is made of, for example, an epoxy-based resin or the like applied to the extension portion 47 . The insulator 48 prevents the extension 47 from being exposed. According to the configuration shown in FIG. 11, it is possible to electrically insulate the plurality of series connection portions 31c formed of busbars by the busbar holders 46 from each other.

- In the connection structure of the coils 15 of the above-described embodiment, two coils 15 each of the four coils 15 in the same phase are connected in series and connected in parallel. However, the structure is not limited to this, and a connection structure as shown in FIG. 12, for example, may be used. In the figure, the connection mode of the U-phase coils "U1" to "U4" is illustrated. The four U-phase coils "U1" to "U4" are connected in series in the order "U1" to "U4". Here, it is assumed that the number of in-phase coils 15 connected in series is 2n (where n is an integer equal to or greater than 2). In the configuration shown in FIG. 12, the number of in-phase coils 15 connected in series is four, that is, n=2.

The stator 12 includes a plurality of serial connection portions 50 for serially connecting a pair of coils 15 having the same phase among the plurality of coils 15 . The plurality of series connection portions 50 includes n first connection portions 51 that serially connect the first derivation portions 21 of the coils 15 of the same phase. In the configuration of FIG. 12, the number of first connection portions 51 in the U phase is two. One first connection portion 51 connects the U-phase coil "U1" and the U-phase coil "U2" in series. The other first connection portion 51 connects the U-phase coil "U3" and the U-phase coil "U4" in series. Each first connection portion 51 is arranged on one side of the stator core 14 in the axial direction. For the first connection portion 51, a configuration similar to that of the above embodiment, that is, the series connection portion 31 shown in FIG. 6 and the series connection portions 31a, 31b, and 31c shown in FIGS.

In the configuration shown in FIG. 12, the plurality of series connection portions 50 includes (n−1) second connection portions 52 that connect the second lead-out portions 22 of the coils 15 of the same phase. In the configuration shown in FIG. 12, there is one second connection portion 52 . The second connection portion 52 connects the U-phase coil “U2” and the U-phase coil “U3” in series. The second connection portion 52 is arranged on the other axial side of the stator core 14 . For the second connection portion 52, a configuration similar to that of the above embodiment, that is, the series connection portion 31 shown in FIG. 6 and the series connection portions 31a, 31b, and 31c shown in FIGS. Further, in the configuration shown in FIG. 12 , the second lead-out portion 22 of the U-phase coil “U1” is connected to the power supply connection portion 33 arranged on the other axial side of the stator core 14 . Further, the second lead-out portion 22 of the U-phase coil “U4” is connected to the neutral point connection portion 32 arranged on the other axial side of the stator core 14 .

According to the configuration shown in FIG. 12, n first connection portions 51 are arranged on one side of the stator core 14 in the axial direction, and (n−1) second connection portions 52 are arranged on the other side of the stator core 14 in the axial direction. placed on the side. Accordingly, in the stator 12 in which the number of in-phase coils 15 connected in series is 2n (where n is an integer equal to or greater than 2), the number of the second connection portions 52 arranged on the other axial side of the stator core 14 is can be configured to be less than the number of the first connection portions 51 arranged on one side of the stator core 14 in the axial direction. Therefore, on the other side of the stator core 14 in the axial direction, it becomes easier to secure a space for arranging the neutral point connecting portion 32 and the power connecting portions 33 , 34 , 35 .

In addition, in the configuration shown in FIG. 12 , each of the first connection portions 51 connects the in-phase coils 15 that are adjacent in the circumferential direction in series. According to this configuration, it is possible to reduce the length of each first connection portion 51 in the circumferential direction. This makes it easier to secure the insulation distance between the first connection portions 51 . In the configuration shown in FIG. 12, the number of in-phase coils 15 connected in series is four, that is, n=2. good.

The series connection portion 31 of the above-described embodiment connects the first lead-out portions 21 of the coils 15 that are adjacent in the circumferential direction, but is not limited to this. They may be connected by a series connection portion 31 .

- Although the lane change portion 15c is set to the axial coil portion 15b in the above embodiment, the lane change portion 15c may be set to the coil end portion 15a.
- In the above embodiment, the busbar holder 42 is integrally formed with the heat transfer member 41 . That is, the busbar holder 42 and the heat transfer member 41 are configured as one integrated component. However, the present invention is not limited to this, and the busbar holder 42 may be configured as a separate component with respect to the heat transfer member 41 . In this case, the busbar holder 42 is fixed to the heat transfer member 41 by, for example, bonding with an adhesive or fastening with screws.

The constituent material of the stator core 14 and the constituent material of the heat transfer member 41 are not limited to the above-described embodiments, and can be changed as appropriate according to the configuration of the motor 10 .
- In the above-described embodiment, the heat transfer member 41 is provided only on one side of the stator core 14 in the axial direction.

- The number of coils 15 is not limited to the above embodiment, and can be changed as appropriate according to the configuration of the motor 10 .
- Although the motor 10 of the above-described embodiment is an inner rotor type, it is also applicable to an outer rotor type motor.

- The embodiments and modifications disclosed this time are exemplifications in all respects, and the present invention is not limited to these exemplifications. That is, the scope of the present invention is indicated by the scope of claims, and is intended to include all changes within the meaning and scope of equivalence to the scope of claims.

Reference Signs List 10 motor, 12 stator, 13 rotor, 14 stator core, 15 coil, 15a coil end portion, 15b axial coil portion, 15c lane change portion, 17 teeth, 20 coil body portion, 21 first lead-out portion, 22 second lead-out portion , C coated conducting wire, 31 (31a, 31b) series connection portion, 31c series connection portion (first busbar), 32 neutral point connection portion (second busbar), 42 busbar holder (second busbar holder), 42a insulation wall, 46 busbar holder (first busbar holder), 50 series connection, 51 first connection, 52 second connection.

Claims (15)

a stator core (14) having a plurality of teeth (17) arranged in the circumferential direction;
a plurality of coils (15) respectively wound around the plurality of teeth,
Each of the plurality of coils is composed of a coated conductor (C),
Each of the plurality of coils includes a coil main body portion (20) formed by winding the coated conductive wire around the teeth, and a first lead-out portion led out from the coil main body portion to one axial direction side of the stator core. (21), and a second lead-out portion (22) led out from the coil body portion to the other side in the axial direction of the stator core,
stator. A plurality of series connection portions (31, 31a, 31b, 31c, 50) for serially connecting a pair of coils that are in phase with each other among the plurality of coils,
A stator according to claim 1 . All of the series connection portions connect the first lead-out portions and are arranged on one side in the axial direction,
3. A stator according to claim 2. Each of the plurality of serial connection portions serially connects a pair of the coils adjacent to each other in the circumferential direction,
4. A stator according to claim 3. The plurality of coils includes 2n (where n is an integer of 2 or more) in-phase coils connected in series,
The plurality of series connection portions include n first connection portions (51) that serially connect the first derivation portions of the in-phase coils, and serially connect the second derivation portions of the in-phase coils. (n−1) second connections (52),
The first connecting portion is arranged on one side in the axial direction,
The second connection portion is arranged on the other side in the axial direction,
3. A stator according to claim 2. Each of the first connection portions connects in series the in-phase coils that are adjacent in the circumferential direction.
A stator according to claim 5 . The pair of coils connected at the series connection portion is composed of a coated conductor wire that is separate from each other,
The series connection part is composed of a coated conductor wire that is separate from each coated conductor wire that constitutes the pair of coils,
A stator according to any one of claims 2 to 6. The pair of coils connected at the series connection portion is composed of a coated conductor wire that is separate from each other,
The series connection portion is configured by directly connecting the coated conductor wires that constitute the pair of coils,
A stator according to any one of claims 2 to 6. The pair of coils connected at the series connection portion is composed of a single coated conductive wire,
The series connection part is a portion of the coated conductor wire that constitutes the pair of coils,
A stator according to any one of claims 2 to 6. a first insulating busbar holder (46) provided on one side of the stator core in the axial direction;
a plate-shaped first bus bar (31c) held by the first bus bar holder;
The series connection portion is configured by the first bus bar,
A stator according to any one of claims 2 to 6. having a neutral point connecting portion (32) that connects coils that are out of phase with each other among the plurality of coils,
The neutral point connecting portion connects the second lead-out portions and is arranged on the other side in the axial direction,
A stator according to any one of claims 2 to 10. a second insulating busbar holder (42) provided on the other side of the stator core in the axial direction;
a plate-shaped second bus bar (32) held by the second bus bar holder;
The neutral point connecting portion is configured by the second bus bar,
A stator according to claim 11 . an insulating wall (42a) for insulating at least one of the first lead-out portions and the second lead-out portions;
A stator according to any one of claims 1 to 12. The coil body portion has a pair of axial coil portions (15b) extending axially along the teeth, and a coil end portion (15a) connecting the pair of axial coil portions in the circumferential direction. death,
The axial coil portion has a lane change portion (15c) in which the coated conductive wire constituting the coil body portion is arranged while being displaced in the radial direction.
A stator according to any one of claims 1 to 13. A motor (10) comprising a stator (12) and a rotor (13) facing the stator,
The stator is
a stator core (14) having a plurality of teeth (17) arranged in the circumferential direction;
a plurality of coils (15) respectively wound around the plurality of teeth,
Each of the plurality of coils is composed of a coated conductor (C),
Each of the plurality of coils includes a coil main body portion (20) formed by winding the coated conductive wire around the teeth, and a first lead-out portion led out from the coil main body portion to one axial direction side of the stator core. (21), and a second lead-out portion (22) led out from the coil body portion to the other side in the axial direction of the stator core,
motor.

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