JP2015047072A - Power collection and distribution ring and electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power collection and distribution ring and an electric motor which allow for easy connection of a bus ring and a winding, without using a connection terminal in the connection with the winding.SOLUTION: A power collection and distribution ring 4 includes first through third bus rings 41-43. Connections 41a, 42a, 43a arranged in the axial direction, and connected with a winding 32 by bending a linear conduction member, and coupling parts 41b, 42b, 43b for coupling the connections 41a, 42a, 43a in the circumferential direction are formed in the first through third bus rings 41-43. The distances in the axial direction between the connection positions 41c, 42c, 43c with the winding 32 and the coupling parts 41b, 42b, 43b are differentiated in the first through third bus rings 41-43, so that the connection positions 41c, 42c, 43c with the winding 32 are equalized in the axial direction at the connections 41a, 42a, 43a. Inclination angles for the radial direction of the plurality of connections 41a, 42a, 43a are differentiated in the first through third bus rings 41-43.

Description

  The present invention relates to a power collection / distribution ring that performs power collection / distribution on a plurality of phase windings, and an electric motor including the power collection / distribution ring.

  2. Description of the Related Art Conventionally, as a power collection and distribution ring for an electric motor, a power collection and distribution member having a plurality of annular bus rings having connection terminals connected to stator windings is known (see, for example, Patent Document 1).

  The bus ring constituting the current collection and distribution member described in Patent Document 1 has a lead frame formed by bending a conducting wire having an insulating coating into an annular shape, and connection terminals connected to a plurality of locations in the circumferential direction of the lead frame. . The connection terminal is connected to a portion where the insulating coating is peeled off and the conductive wire is exposed by, for example, heat caulking (fusing) or the like.

  The connection terminal includes a fixed part connected to the lead frame, a connection part in which the end of the winding is connected by, for example, heat caulking (fusing) or the like, and a radially inward direction of the bus ring from the end of the fixed part And an extended curved portion that extends while being curved and connects the fixed portion and the connecting portion. The connection terminal has a different shape of the extended curved portion for each phase of the bus ring so that the connection position with the end of the winding in the connection portion is the same in the axial direction for each phase of the bus ring. .

JP 2009-261082 A

  In the current collection and distribution member described in Patent Document 1, after connecting the connection terminal manufactured in a separate process to the lead frame, the end of the winding is connected to the connection part of the connection terminal, which takes time and effort at the time of work. It was. Therefore, the present inventor can connect the end of the winding directly to the bus ring without using the connection terminal if the bus ring in which the connection portion is formed by bending the linear conductive member is used. I got the idea of being able to do it. However, in the bus ring in which the connection portion is formed by bending the conductive member, the connection position with the end of the winding cannot be adjusted by the connection terminal. Therefore, when the bus ring of each phase is arranged in the axial direction, There is a problem in that the connection position between the end of the winding in the connecting portion differs in the axial direction for each bus ring, and the connection work between the connecting portion and the end of the winding becomes complicated.

  Therefore, an object of the present invention is to provide a power collection and distribution ring and an electric motor that can easily connect a bus ring and a winding without using a connection terminal for connection with the winding.

  In order to solve the above problems, the present invention includes annular first to third bus rings for collecting and distributing power to a winding wound around a core, and the first to third buses are provided. The ring is arranged side by side in the axial direction, and by bending a linear conductive member, a plurality of connection portions connected to the winding, and a plurality of connection portions connecting the plurality of connection portions in the circumferential direction And the distance between the connection position with the winding and the plurality of connecting portions in the axial direction is equalized so that the connection position with the winding in each of the plurality of connection portions is equalized in the axial direction. Different from each of the first to third bus rings, the plurality of connection portions provide a power collection and distribution ring in which an inclination angle with respect to a radial direction is different from each other in the first to third bus rings.

  Moreover, this invention provides the electric motor provided with the said power collection and distribution ring and the stator comprised including the said several core and the said multi-phase said coil | winding in order to solve the said subject.

  According to the power collection and distribution ring and the electric motor of the present invention, it is possible to easily connect the bus ring and the winding without using a connection terminal for connection with the winding.

It is a schematic diagram explaining the outline of the structural example of the electric motor which concerns on embodiment of this invention. It is a perspective view of the stator with which the power collection and distribution ring was mounted | worn. It is the top view which looked at the current collection and distribution ring and the stator from the center axis direction. It is a perspective view which shows the structural example of an insulator. It is a perspective view which shows a current collection and distribution ring. 4 shows a configuration example of a power collection and distribution ring, where (a) is a cross-sectional view taken along line AA in FIG. 4, (b) is a cross-sectional view taken along line BB in FIG. 4, and (c) is a cross-sectional view taken along line CC in FIG. It is. (A) is a side view which shows the structural example of the jig | tool for forming the 2nd and 3rd bus ring, (b) is a cross section in the state in which the 3rd bus ring was wound around the jig | tool. FIG. It is explanatory drawing which shows the connection method of the connection part of a 2nd bus ring, and the one edge part of a V-phase coil | winding. (A) shows the connection portion of the first bus ring and one end of the U-phase winding before connection, and (b) shows the connection portion and U-phase of the first bus ring after connection. It is a top view which shows one edge part of a coil | winding.

[Embodiment]
Embodiments of a power collection and distribution ring and an electric motor according to the present invention will be described with reference to FIGS.

(Configuration of electric motor 1)
FIG. 1 is a schematic diagram illustrating an outline of a configuration example of an electric motor 1 according to an embodiment of the present invention.

  The electric motor 1 includes a rotor 2 as a rotor, a stator 3 as a stator, a power collection and distribution ring 4 having first to third bus rings 41 to 43 held by the stator 3, and a neutral phase bus. And a ring 44.

  The rotor 2 is fixed to the outer peripheral surface of the shaft 21 so as to be rotatable coaxially with the stator 3 by a bearing (not shown), and the north and south poles are alternately magnetized along the circumferential direction. And a cylindrical magnet 22.

  The stator 3 has a plurality of cores 31 arranged in an annular shape, a winding 32 wound around the outer periphery of the core 31, and an insulator 33 (shown in FIG. 2) to be described later.

  In the present embodiment, 24 cores 31 are annularly arranged around the rotation axis O of the shaft 21 shown in FIG. These 24 cores 31 are composed of eight U-phase cores 31U, eight V-phase cores 31V, and eight W-phase cores 31W in the rotational direction R of the rotor 2 shown in FIG. A V-phase core 31V is arranged next to the U-phase core 31U, a W-phase core 31W is arranged next to the V-phase core 31V, and a U-phase core 31U is arranged next to the W-phase core 31W. Has been. In this embodiment, a plurality (24 pieces) of cores 31 arranged in a ring shape are used. However, as another embodiment, a ring body in which the plurality of cores 31 are integrated is used. Is also possible.

  A U-phase winding 32U is wound as a winding 32 around the U-phase core 31U, and current collection (distribution and distribution) is performed by the first bus ring 41 with respect to the U-phase winding 32U. . A V-phase coil 32 </ b> V is wound around the V-phase core 31 </ b> V as the winding 32, and current collection and distribution is performed by the second bus ring 42 with respect to the V-phase coil 32 </ b> V. A W-phase coil 32 </ b> W is wound around the W-phase core 31 </ b> W as the winding 32, and power is collected and distributed by the third bus ring 43 to the W-phase coil 32 </ b> W.

  Of both ends of the U-phase winding 32U, one end 321U is electrically connected to the first bus ring 41, and the other end 322U is electrically connected to the neutral phase bus ring 44. Yes. Of both ends of the V-phase winding 32V, one end 321V is electrically connected to the second bus ring 42, and the other end 322V is electrically connected to the neutral phase bus ring 44. Yes. Also, of the both ends of the W-phase winding 32 </ b> W, one end 321 </ b> W is electrically connected to the third bus ring 43, and the other end 322 </ b> W is electrically connected to the neutral phase bus ring 44. Has been.

  Accordingly, the neutral phase bus ring 44 includes the other end 322U of the U-phase winding 32U, the other end 322V of the V-phase winding 32V, and the other end 322W of the W-phase winding 32W. Are electrically connected.

  The first to third bus rings 41 to 43 are connected to power supply terminals 410, 420, and 430, respectively, and the sine whose phase is shifted by 120 ° from the inverter (not shown) via the power supply terminals 410, 420, and 430. A wavy drive current is supplied. A rotating magnetic field is formed in the stator 3 by this driving current, and the magnet 22 receives the rotating force by the attractive force and the repulsive force by the rotating magnetic field, and rotates the shaft 21 around the rotation axis O.

  FIG. 2 is a perspective view of the stator 3 to which the power collection and distribution ring 4 is attached. FIG. 3 is a plan view of the power collection and distribution ring 4 and the stator 3 as seen from the central axis direction.

  The stator 3 includes a plurality of core assemblies 30 in which an insulator 33 is mounted on a core 31 formed by laminating a plurality of electromagnetic steel plates 310, and windings 32 are wound around the core 31 via the insulator 33. In the present embodiment, 24 core assemblies 30 are annularly arranged to constitute the stator 3.

  The insulator 33 has a holding portion 330 that holds the first to third bus rings 41 to 43. The holding section 330 is provided on the outer peripheral side of the winding 32 (U-phase winding 32U, V-phase winding 32V, W-phase winding 32W).

  The first to third bus rings 41 to 43 are arranged side by side in the axial direction of the stator 3, and are held by the holding unit 330 in a state of being fixed together by a plurality of fixing members 40. At this time, one end 321U of the U-phase winding 32U, one end 321V of the V-phase winding 32V, and one end 321W of the W-phase winding 32W are as shown in FIG. It will be in the state inserted in the some connection part 41a, 42a, 43a formed in the 1st thru | or 3rd bus rings 41-43, respectively. A more detailed configuration of the plurality of connection portions 41a, 42a, 43a will be described later.

(Configuration of insulator 33)
Next, the insulator 33 will be described more specifically. The insulator 33 constituting the core assembly 30 around which the U-phase winding 32U is wound out of the plurality of core assemblies 30 will be described below as an example.

  FIG. 4 is a perspective view illustrating a configuration example of the insulator 33. In FIG. 4, the U-phase winding 32U and the core 31 are indicated by broken lines.

  The insulator 33 is made of an insulating material such as a resin, and has an insulating portion 336 interposed between the core 31 and the U-phase winding 32U, and a first wall facing the insulating portion 336 in the radial direction of the stator 3. A portion 331 and a second wall portion 332, an inner flange portion 334 projecting from the first wall portion 331 toward the inner peripheral side of the stator 3 and orthogonal to the axial direction of the stator 3, and a second wall portion The outer flange 335 projects from the outer periphery of the stator 3 toward the outer peripheral side of the stator 3, and is erected so as to face the second wall 332 from the outer flange 335 orthogonal to the axial direction of the stator 3 and the end of the outer flange 335. The third wall portion 333 is integrally provided.

  The first wall portion 331, the second wall portion 332, and the third wall portion 333 are formed of the first wall portion 331, the second wall portion 332, the second wall portion 332 from the inner peripheral side of the stator 3 toward the outer peripheral side. The three wall portions 333 are formed in this order.

  The second wall portion 332 is formed with an insertion portion 332a through which one end portion 321U of the U-phase winding 32U is inserted, and the one end portion 321U of the U-phase winding 32U extends from the insertion portion 332a to the stator. 3 is pulled out along the axial direction. In the state where the plurality of insulators 33 are arranged in a ring shape, the insertion portions 332a of the respective insulators 33 have equal intervals in the circumferential direction.

  The first wall portion 331 is formed with an insertion portion 331a through which the other end 322U of the U-phase winding 32U is inserted. The insertion portion 331 a is formed by cutting away from the axial end of the first wall portion 331 toward the inner flange portion 334. The other end 322U of the U-phase winding 32U is drawn out radially inward of the stator 3 from the insertion portion 331a.

  Here, referring to FIG. 3, one end 321U of the U-phase winding 32U is located on the V-phase winding 32V side in the circumferential direction, and the other end 322U is the W-phase winding in the circumferential direction. It is located on the winding 32W side. One end 321V of the V-phase winding 32V is located on the W-phase winding 32W side in the circumferential direction, and the other end 322V is located on the U-phase winding 32U side in the circumferential direction. . One end 321W of the W-phase winding 32W is located on the U-phase winding 32U side in the circumferential direction, and the other end 322W is located on the V-phase winding 32V side in the circumferential direction. .

  The holding part 330 that holds the power collection and distribution ring 4 includes a part of the second wall part 332, a third wall part 333, and a part of the second wall part 332 and the third wall part 333. It is comprised by the outer collar part 335 to connect. The outer flange portion 335 functions as the bottom portion of the holding portion 330.

  The third wall portion 333 is formed with a fitting recess 333a into which the fixing member 40 for fixing the first to third bus rings 41 to 43 is fitted. In a state where the plurality of insulators 33 are arranged in a ring shape, the fitting recesses 333a of the respective insulators 33 have equal intervals in the circumferential direction.

(Configuration of power collection and distribution ring 4)
Next, the configuration of the power collection and distribution ring 4 will be described more specifically.

  FIG. 5 is a perspective view showing the power collection and distribution ring 4. 6 shows a configuration example of the power collection and distribution ring 4, (a) is a cross-sectional view taken along line AA in FIG. 5, (b) is a cross-sectional view taken along line BB in FIG. 5, and (c) is C in FIG. FIG. In FIG. 6, one end (321U, 321V, 321W) of each winding is indicated by a two-dot chain line.

  As shown in FIG. 6, the first to third bus rings 41 to 43 are formed by bending a linear conductive member in which a central conductor 400a made of a highly conductive metal such as copper is covered with an insulator 400b made of resin. Is formed.

  The first bus ring 41 protrudes radially inward, and is connected to one end 321U of the U-phase winding 32U (eight in the present embodiment) and a plurality of connections 41a. And a plurality of (in the present embodiment, eight) arc-shaped connecting portions 41b that connect the portions 41a in the circumferential direction. Further, at both ends of the first bus ring 41, the central conductor 400a is exposed from the insulator 400b, and the power supply terminal 410 is connected to the exposed central conductor 400a by crimping or crimping.

  The second bus ring 42 protrudes inward in the radial direction, and is connected to one end 321V of the V-phase winding 32V (eight in the present embodiment) and a plurality of connections 42a. And a plurality of (in the present embodiment, eight) arc-shaped connecting portions 42b that connect the portions 42a in the circumferential direction. Further, at both ends of the second bus ring 42, the central conductor 400a is exposed from the insulator 400b, and the power supply terminal 420 is connected to the exposed central conductor 400a by crimping or crimping.

  The third bus ring 43 protrudes inward in the radial direction, and is connected to one end 321W of the W-phase winding 32W (eight in this embodiment) and a plurality of connections 43a. A plurality of (in the present embodiment, eight) arc-shaped connecting portions 43b that connect the portions 43a in the circumferential direction. Further, at both ends of the third bus ring 43, the central conductor 400a is exposed from the insulator 400b, and the feeding terminal 430 is connected to the exposed central conductor 400a by crimping or crimping.

  The connection part 41a of the first bus ring 41, the connection part 42a of the second bus ring 42, and the connection part 43a of the third bus ring 43 are connected to the first to third bus rings 41 to 43 in the axial direction. The intervals in the circumferential direction are set to be equal when arranged side by side. Note that “the intervals are set to be equal” may not be completely equal, and may be shifted by, for example, about 0.1 mm to 2.0 mm.

  The plurality of connection portions 41 a of the first bus ring 41, the plurality of connection portions 42 a of the second bus ring 42, and the plurality of connection portions 43 a of the third bus ring 43 are the first to third bus rings 41. The inclination angles with respect to the radial direction of .about.43 are different in the first to third bus rings 41 to 43, respectively.

  As shown in FIG. 6A, in the first bus ring 41, a straight line connecting the center of the central conductor 400a in the connecting portion 41b and the radially inner end of the connecting portion 41a is the first bus ring 41. (Inclination angle 0 °). That is, the connecting portion 41 a protrudes in a direction parallel to the radial direction of the first bus ring 41.

As shown in FIG. 6B, in the second bus ring 42, a straight line connecting the center of the central conductor 400a in the connecting portion 42b and the radially inner end of the connecting portion 42a is the second bus ring 42. Is inclined by θ _{1 with} respect to the radial direction (inclination angle θ ₁ > 0 °).

As shown in FIG. 6C, in the third bus ring 43, a straight line connecting the center of the center conductor 400 a in the connecting portion 43 b and the radially inner end of the connecting portion 43 a is the third bus ring 43. Is inclined by θ _{2 with} respect to the radial direction (inclination angle θ ₂ > 0 °).

The inclination angles θ ₁ and θ ₂ are such that the radially inner ends of the connection portion 42 a of the second bus ring 42 and the connection portion 43 a of the third bus ring 43 are the connection portions 41 a of the first bus ring 41. The direction approaching is a positive angle. That is, the connecting portion 42a of the second bus ring 42 and the connecting portion 43a of the third bus ring 43 have tips in the protruding direction with respect to the respective connecting portions 42b and 43b approaching the connecting portion 41a of the first bus ring 41. So as to be inclined.

  In other words, the connection position 41 c of the plurality of connection portions 41 a of the first bus ring 41 with the one end 321 U of the U-phase winding 32 U and the V at the plurality of connection portions 42 a of the second bus ring 42. The connection position 42c with one end 321W of the phase winding 32V and the connection position 43c with one end 321W of the W-phase winding 32W in the plurality of connection parts 43a of the third bus ring 43 are equal. As shown, the distance in the axial direction between the connection position 41c of the U-phase winding 32U and the one end 321U of the U-phase winding 32U and the plurality of connecting portions 41b, and the connection of one end 321W of the V-phase winding 32V The distance in the axial direction between the position 42c and the plurality of connecting portions 42b and the distance in the axial direction between the connecting position 43c with the one end 321W of the W-phase winding 32W and the plurality of connecting portions 43b are first to 3rd bass It is different in each of the grayed 41 to 43.

  Here, “equalization” means that the axial distance between the connection positions 41c, 42c, 43c with the winding 32 is narrower than in the case where the inclination angles of the connection portions 41a, 42a, 43a are equal to each other. That means.

In the present embodiment, the plurality of connection portions 42 a of the second bus ring 42 are connected to the one end portion 321 U of the U-phase winding 32 U in the plurality of connection portions 41 a of the first bus ring 41. Are inclined so as to match the connection position 42c with one end 321W of the V-phase winding 32V in the plurality of connection portions 42a. The plurality of connection portions 43a of the third bus ring 43 are connected to a plurality of connection portions 43a at connection positions 41c with one end portion 321U of the U-phase winding 32U in the plurality of connection portions 41a of the first bus ring 41. Is inclined so as to match the connection position 43c with one end 321W of the W-phase winding 32W. Therefore, the inclination angle θ ₂ is set larger than the inclination angle θ ₁ (inclination angle θ ₂ > inclination angle θ ₁ > 0 °).

  In the present embodiment, a plurality of second bus rings 42 are arranged in accordance with a connection position 41c with one end 321U of U-phase winding 32U in a plurality of connection parts 41a of first bus ring 41. The connection portions 42a and the plurality of connection portions 43a of the third bus ring 43 are inclined. However, the present invention is not limited to this. For example, the V-phase windings 32V of the plurality of connection portions 42a of the second bus ring 42 The plurality of connection portions 41a of the first bus ring 41 and the plurality of connection portions 43a of the third bus ring 43 may be inclined in accordance with the connection position 42c with one end portion 321V.

  Further, for example, the plurality of connection portions 41 a of the first bus ring 41 are matched with the connection position 43 c of the plurality of connection portions 43 a of the third bus ring 43 with one end portion 321 W of the W-phase winding 32 </ b> W. The plurality of connecting portions 42a of the second bus ring 42 may be inclined.

  Further, the plurality of connection portions 41 a of the first bus ring 41, the plurality of connection portions 42 a of the second bus ring 42, and the third bus ring 43 are adjusted in accordance with the determined connection position with the winding 32. You may incline the some connection part 43a, respectively.

(Manufacturing method of the second bus ring 42 and the third bus ring 43)
Next, the manufacturing method of the 2nd bus ring 42 and the 3rd bus ring 43 is demonstrated with reference to FIG.

  FIG. 7A is a side view showing a configuration example of the jig 5 for forming the second and third bus rings 42 and 43, and FIG. It is sectional drawing in the state wound around the jig | tool 5. FIG.

The second bus ring 42 and the third bus ring 43 have a plurality of connecting portions 42a having an inclination angle θ ₁ and an inclination angle θ ₂ by using a jig 5 as shown in FIG. A plurality of connecting portions 43a are formed. Hereinafter, the third bus ring 43 will be described in more detail as an example.

The jig 5 includes a circular base 51 that supports the plurality of connecting portions 43 b of the third bus ring 43, and an inclined portion 52 having an inclined surface 52 a inclined by θ _{2 with} respect to the base 51. . The inclined portion 52 has an isosceles trapezoidal shape in a side view or a cross section. When the second bus ring 42 is manufactured, the inclined surface 52 a of the jig 5 is inclined by θ _{1 with} respect to the base portion 51.

In the manufacturing process of the third bus ring 43, first, a plurality of connecting portions 43a are formed by bending a linear conductive member. Next, the conductive member formed with the plurality of connection portions 43 a is wound around the outer periphery of the inclined portion 52 of the jig 5. At this time, as shown in FIG. 7B, the conductive member is wound around the inclined portion 52 while pressing the plurality of connecting portions 43 a against the inclined surface 52 a, so that the plurality of connecting portions 43 b supported by the base portion 51 are wound. a plurality of connecting portions 43a that theta ₂ inclined Te is formed. Thus, the third bus ring 43 annular inclination angle with respect to a plurality of connecting portions 43b is projected to a plurality of connection portions 43a are radially inward a theta ₂ is formed.

(Method of connecting the first to third bus rings 41 to 43 and the winding 32)
Next, a method of connecting the first bus ring 41 and the U-phase winding 32U, the second bus ring 42 and the V-phase winding 32V, and the third bus ring 43 and the W-phase winding 32W. This will be described with reference to FIGS.

  The first to third bus rings 41 to 43 and the U-phase winding 32U, the V-phase winding 32V, and the W-phase winding 32W include one end portions 321U, 321V, and 321W of the respective windings 32. Electrical connection is established by caulking the connecting portions 41a, 42a, 43a in the inserted state.

  First bus ring 41 and one end 321U of U-phase winding 32U, second bus ring 42 and one end 321V of V-phase winding 32V, and third bus ring 43 and W-phase Since the connection method with one end 321W of the winding 32W is the same, the connection method between the first bus ring 41 and one end 321U of the U-phase winding 32U will be described below as an example. To do.

  FIG. 8 is an explanatory diagram showing a connection method between the connection portion 41a of the first bus ring 41 and one end portion 321U of the U-phase winding 32U. FIG. 9A shows the connection portion 41a of the first bus ring 41 before connection and one end 321U of the U-phase winding 32U, and FIG. 9B shows the first bus after connection. 4 is a plan view showing a connection part 41a of a ring 41 and one end part 321U of a U-phase winding 32U. FIG.

  As shown in FIG. 9A, the connection portion 41a of the first bus ring 41 is a pair extending radially inward from the coupling portion 41b and sandwiching one end portion 321U of the U-phase winding 32U. The extending portion (the first extending portion 411 and the second extending portion 412) and the curved portion 413 formed between the first extending portion 411 and the second extending portion 412 are integrated. Have. The connection part 41a is tin-plated on its surface.

  When the first bus ring 41 is attached to the stator 3 (see FIGS. 2 and 3), one end 321U of the U-phase winding 32U has a first extension 411 and a second extension 412. Between. That is, one end portion 321U of the U-phase winding 32U is inserted into the connection portion 41a.

  In the present embodiment, connection between the connection portion 41a and one end portion 321U of the U-phase winding 32U is performed by heat caulking (fusing). More specifically, as shown in FIG. 8, the positive electrode 501 is brought into contact with the side surface 411a of the first extension part 411, and the negative electrode 502 is brought into contact with the side face 412a of the second extension part 412. While pressing the first extension portion 411 and the second extension portion 412 against one end 321U of the U-phase winding 32U by the positive electrode 501 and the negative electrode 502, between the positive electrode 501 and the negative electrode 502 DC voltage is applied to

  Then, a direct current flows from the positive electrode 501 to the negative electrode 502 through the first extension portion 411, one end portion 321U of the U-phase winding 32U, and the second extension portion 412. First, the plated tin is melted, and then the first extension portion 411 and the second extension portion 412 in the vicinity of one end portion 321U of the U-phase winding 32U inserted through the connection portion 41a are melted. To do. Thereby, the connection part 41a of the first bus ring 41 and the one end part 321U of the U-phase winding 32U are electrically connected.

  At this time, the distance between the first extending portion 411 and the second extending portion 412 is narrowed, but at least on the first extending portion 411 and the connecting portion 41b side on the connecting portion 41b side. The second extending portion 412 is not welded directly. Similarly, the connecting portions 41b adjacent to each other with the connecting portion 41a interposed therebetween are not welded directly. That is, there is a gap between the first extending portion 411 on the connecting portion 41b side and the second extending portion 412 on the connecting portion 41b side, and between the adjacent connecting portions 41b across the connecting portion 41a. Is vacant.

  When performing the heat caulking work, in the first to third bus rings 41 to 43, the connection position 41c between the connection portions 41a, 42a, 43a and one end (321U, 321V, 321W) of each winding 32. 42c, 43c are equalized, it is not necessary to move the positive electrode 501 and the negative electrode 502 in accordance with the connection positions 41c, 42c, 43c.

(Operation and effect of the embodiment)
According to the embodiment described above, the following operations and effects can be obtained.

(1) The distances in the axial direction between the connecting positions 41c, 42c, 43c and the connecting portions 41b, 42b, 43b with one end (321U, 321V, 321W) of each winding 32 in the connecting portions 41a, 42a, 43a are Since the first to third bus rings 41 to 43 are different from each other, the connection positions 41c, 42c, and 41c, 42a, 43a are connected to one end (321U, 321V, 321W) of each winding 32 in the connection parts 41a, 42a, 43a. 43c can be equalized.

(2) In the first to third bus rings 41 to 43, connection positions 41c, 42c, 43c with one end portions 321U, 321V, 321W of the windings 32U, 32V, 32W in the connection portions 41a, 42a, 43a. Are equalized so that the positive electrode 501 and the negative electrode 502 are connected to each other when the connecting portions 41a, 42a, 43a and one end portions 321U, 321V, 321W of the windings 32U, 32V, 32W are heat-clamped. There is no need to move it according to the position, and work efficiency can be improved.

(3) The connection positions 41c with one end (321U, 321V, 321W) of each winding 32 in the connection portions 41a, 42a, 43a are different because the inclination angles of the connection portions 41a, 42a, 43a with respect to the radial direction are different. 42c and 43c are equalized, the first to third bus rings 41 to 43 can be formed using the same shape of the conductive member.

(4) The connecting portion 41a of the first bus ring 41, the connecting portion 42a of the second bus ring 42, and the connecting portion 43a of the third bus ring 43 are connected to the first to third bus rings 41 to 43. Since the intervals in the circumferential direction are set to be equal when arranged side by side in the axial direction, each insertion portion 332a in the plurality of insulators 33 arranged in a ring has a formation position in the circumferential direction for each insulator 33. There is no need to change, and the shape of each insulator 33 can be made the same. Thereby, it is not necessary to prepare a plurality of molds for molding the insulator 33, leading to a reduction in manufacturing cost of the insulator 33.

(Summary of embodiment)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals in the embodiment. However, the reference numerals and the like in the following description are not intended to limit the constituent elements in the claims to the members and the like specifically shown in the embodiments.

[1] First to third bus rings including annular first to third bus rings (41 to 43) for collecting and distributing power to the winding (32) wound around the core (31). (41-43) are arranged side by side in the axial direction, and by bending a linear conductive member, a plurality of connection portions (41a, 42a, 43a) connected to the winding (32), and a plurality of A plurality of connecting portions (41b, 42b, 43b) for connecting the connecting portions (41a, 42a, 43a) in the circumferential direction are formed, and the winding (32) in each of the plurality of connecting portions (41a, 42a, 43a). The connection position (41c, 42c, 43c) with the winding (32) and the plurality of connecting portions (41b, 42b, 43b) so that the connection position (41c, 42c, 43c) with the coil is equalized in the axial direction. The axial distance of the first to third bus rings ( 1 to 43), and the plurality of connecting portions (41a, 42a, 43a) have different power collection rings (inclination angles with respect to the radial direction in the first to third bus rings (41 to 43)). 4).

[2] The power collection and distribution ring according to [1], in which any one of the first to third bus rings (41 to 43) has a plurality of connecting portions protruding along a radial direction thereof. 4).

[3] The first to third bus rings (41 to 43) and the core (31) are arranged side by side in the axial direction, and the core (31) among the first to third bus rings (41 to 43). The bus ring arranged at a position farthest from the power distribution ring (4) according to [1], wherein a plurality of connecting portions protrude along the radial direction.

[4] A stator (3) configured to include the power collection and distribution ring (4) according to any one of [1] to [3], a plurality of cores (31), and a plurality of phase windings (32). And an electric motor (1).

[5] The first to third bus rings (41 to 43) and the winding (32) are in a state in which the winding (32) is inserted into each of the plurality of connection portions (41a, 42a, 43a). The electric motor (1) according to [4], which is electrically connected by being heat-clamped.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  The present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, in the above embodiment, the first to third bus rings 41 to 43 have the central conductor 400a covered with the insulator 400b. However, the present invention is not limited to this, and the single wire conductors are not covered with the insulator 400b. But you can.

  Moreover, in the said embodiment, although the some connection part 41a, 42a, 43a of the 1st thru | or 3rd bus rings 41-43 protruded in the radial direction inner side of the connection part 41b, 42b, 43b, Not limited to this, all of the plurality of connecting portions 41a, 42a, 43a may protrude outward in the radial direction of the connecting portions 41b, 42b, 43b.

  Moreover, in the said embodiment, although the 1st thru | or 3rd bus rings 41-43 were hold | maintained at the stator 3 in the state fixed collectively by the some fixing member 40, it is not restricted to this, The stator 3 A fixing member for fixing the first to third bus rings 41 to 43 may be provided on the side.

  Moreover, in the said embodiment, although the some connection part 42a, 43a of the 2nd and 3rd bus rings 42 and 43 was formed using the jig | tool 5, it is not restricted to this, For example, it is several by manual work etc. The connecting portions 42a and 43a may be formed.

DESCRIPTION OF SYMBOLS 1 ... Electric motor 3 ... Stator 4 ... Power collection / distribution ring 31,31U, 31V, 31W ... Core 32 ... Winding 32U, 32V, 32W ... U phase, V phase, W phase winding 41-43 ... 1st thru | or 3rd Bus rings 41a, 42a, 43a ... connection portions 41b, 42b, 43b ... connection portions 41c, 42c, 43c ... connection positions 321U, 321V, 321W ... one end

Claims (5)

An annular first to third bus ring that collects and distributes power with respect to the winding wound around the core;
The first to third bus rings are arranged side by side in the axial direction, and bend the linear conductive member to surround the plurality of connection portions connected to the winding and the plurality of connection portions. A plurality of connecting portions connected in the direction,
The distance in the axial direction between the connection position with the winding and the plurality of connecting portions is such that the connection position with the winding in each of the plurality of connection parts is equalized in the axial direction. Different for each of the three bus rings,
The plurality of connecting portions have different inclination angles with respect to the radial direction in the first to third bus rings,
Power collection and distribution ring. Any one of the first to third bus rings has a plurality of connecting portions protruding along a radial direction thereof.
The power collection and distribution ring according to claim 1. The first to third bus rings and the core are arranged side by side in the axial direction,
Among the first to third bus rings, the bus ring arranged at the position farthest from the core has the plurality of connecting portions protruding along the radial direction thereof.
The power collection and distribution ring according to claim 1. The power collection and distribution ring according to any one of claims 1 to 3,
A stator configured to include a plurality of cores and a plurality of phases of windings;
Electric motor. The first to third bus rings and the winding are electrically connected by being heat-clamped in a state where the winding is inserted into each of the plurality of connecting portions,
The electric motor according to claim 4.

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