DE102016119564A1 - Ring for collecting and distributing electricity, electric motor and method of manufacturing an electric motor - Google Patents

Abstract

A ring for collecting and distributing electricity (4) comprises a plurality of bus rings (41) and a neutral-phase bus bar (44), and an annular holder (5) for holding the bus rings (41). The holder (5) comprises separate arcuate holding elements (50). The bus rings (41) to (43) are respectively formed by bending a single continuous wire-shaped conductor so that held portions (410), (420), (430) to be held by the holder (5) and connecting portions (FIGS. 411), (421), (431) disposed between the plurality of held portions (410), (420), (430) and connected to the windings (32) are arranged annularly. The connecting portions (411), (421), (431) project outwardly from the holder (5) to be connected to the coils (32) by crimping. A diameter reduction of the first to third bus rings (41) to (43) by the crimping is limited by a contact between the holding portions (50) in a circumferential direction.

Description

Background of the invention

1. Field of the invention

The invention relates to a ring for collecting and distributing electricity for collecting and distributing multi-phase currents of multiple phases of / on polyphase windings, an electric motor provided with the ring for collecting and distributing electricity, and a method of manufacturing the electric motor.

2. Description of the Related Art

An electric motor used as a drive source of a vehicle, etc. has a stator with polyphase windings each wound on a plurality of core elements, a rotor rotating relative to the stator, and a ring for collecting and distributing electricity to the stator Collecting and distributing electrical currents from / to the multi-phase windings of the stator (see e.g. JP-A-2015-46958 ) on.

The in JP-A-2015-46958 described ring for collecting and distributing electricity is provided with a plurality of annular bus rings (annular conductors) corresponding to the respective phases of the polyphase windings, and a plurality of fastening elements for fixing the plurality of bus rings to each other. A plurality of recesses for respectively receiving the plurality of bus rings are formed on the fixing members. Connecting portions to be connected to ends of the windings are provided on each of the plurality of bus rings so as to protrude radially between a pair of circumferentially adjacent bus rings.

Each connecting portion of each bus ring is composed of an arc portion having an arc shape and a pair of shaft portions facing each other in the circumferential direction with the arc portion interposed therebetween. Lead-out wires are inserted as a portion of the windings between the pairs of shaft portions, the connection portions and the lead-out wires are fused and joined by thermally crimping (melting) the lead-out wires between the pairs of shaft portions, and thereby electrically connecting the bus rings to the windings.

Summary of the invention

When attaching the in JP-A-2015-46958 As described above, for collecting and distributing electricity to the stator, the ring for accumulating and distributing electricity is put on the stator with the lead-out wires (turns) protruding, and the plural connection portions are then thermally crimped in turn. During the thermal crimping, a gap between the pair of shaft portions of each connection portion is narrowed. Thus, the diameter of the bus ring can be gradually reduced so as to cause misalignment between some connection portions and lead-out wires (windings). In this case, the position of the ring for collecting and distributing electricity or the positions of the lead-out wires must be corrected, resulting in an increase in the working time.

• (1) Gemäß einer Ausführungsform der Erfindung wird ein Ring zum Sammeln und Verteilen von Elektrizität zum Sammeln und Verteilen von Mehrphasenströmen mit unterschiedlichen Phasen von/auf mehrere(n) Wicklungen bereitgestellt, der umfasst: mehrere Busringe, die für die jeweiligen Phasen bereitgestellt sind und parallel zueinander entlang einer axialen Richtung angeordnet sind, und einen ringförmigen Halter zum Halten der mehreren Busringe, wobei der Halter mehrere separate bogenförmige Halteelemente umfasst, wobei mehrere Haltenuten zum Halten der mehreren Busringe an den mehreren Halteelementen so ausgebildet sind, dass sie sich auf der Außenseite des Halters öffnen, wobei jeder der mehreren Busringe durch Biegen eines einzelnen kontinuierlichen drahtförmigen Leiters so ausgebildet ist, dass mehrere gehaltene Abschnitte, die durch den Halter gehalten werden sollen, und mehrere Verbindungsabschnitte, die zwischen den mehreren gehaltenen Abschnitten angeordnet sind und mit den Wicklungen verbunden sind, ringförmig angeordnet sind, wobei die Verbindungsabschnitte von dem Halter nach außen vorstehen, um durch Crimpen in einer Umfangsrichtung mit den Wicklungen verbunden zu werden, und wobei eine Durchmesserreduktion der mehreren Busringe durch das Crimpen durch einen Kontakt zwischen den mehreren Halteabschnitten in der Umfangsrichtung begrenzt wird.
• (2) Gemäß einer weiteren Ausführungsform der Erfindung wird ein Elektromotor bereitgestellt, der umfasst: den Ring zum Sammeln und Verteilen von Elektrizität gemäß dem obigen Ausführungsbeispiel (1), einen Stator, der in der Lage ist, ein rotierendes Magnetfeld durch elektrische Ströme zu erzeugen, die durch die mehreren Wicklungen fließen, und einen Rotor, der durch das rotierende Magnetfeld relativ zu dem Stator gedreht wird.
• (3) Gemäß einer weiteren Ausführungsform der Erfindung ist ein Verfahren zum Herstellen eines Elektromotors bereitgestellt, der einen Rotor, einen Stator, der in der Lage ist, ein Magnetfeld zu erzeugen, um den Rotor durch elektrische Ströme zu drehen, die durch Wicklungen fließen, und einen Ring zum Sammeln und Verteilen von Elektrizität zum Sammeln und Verteilen von Mehrphasenströmen mit unterschiedlichen Phasen von/auf den/die Wicklungen umfasst, wobei der Ring zum Sammeln und Verteilen von Elektrizität mehrere Busringe, die für die jeweiligen Phasen bereitgestellt sind und parallel zueinander entlang einer axialen Richtung angeordnet sind, und einen ringförmigen Halter zum Halten der mehreren Busringe umfasst, wobei der Halter mehrere separate bogenförmige Halteelementen umfasst, wobei mehrere Haltenuten zum Halten der mehreren Busringe an den mehreren Halteelementen so ausgebildet sind, dass sie sich auf der Außenseite des Halters öffnen, wobei jeder der mehreren Busringe durch Biegen eines einzelnen kontinuierlichen drahtförmigen Leiters so ausgebildet ist, dass mehrere gehaltene Abschnitte, die durch den Halter gehalten werden sollen, und mehrere Verbindungsabschnitten, die zwischen den mehreren gehaltenen Abschnitten angeordnet sind und mit den Wicklungen verbunden sind, ringförmig angeordnet sind, wobei die Verbindungsabschnitte von dem Halter nach außen vorstehen, um durch Crimpen in einer Umfangsrichtung mit den Wicklungen verbunden zu werden, wobei das Verfahren umfasst: Anordnen der mehreren Busringe parallel zueinander entlang einer axialen Richtung, Anordnen der mehreren Halteelemente durch Verschieben von der Innenseite in Richtung der Außenseite relativ zu den mehreren Busringen, die parallel angeordnet sind, so dass die gehaltenen Abschnitte der mehreren Busringe jeweils in den mehreren Haltenuten aufgenommen werden; und Verbinden der mehreren Busringe mit den Wicklungen durch Crimpen der Verbindungsabschnitte in einer Umfangsrichtung, wobei die Durchmesserreduktion der mehreren Busringe durch das Crimpen zu dem Zeitpunkt des Verbindens durch einen Kontakt zwischen den mehreren Halteabschnitten in der Umfangsrichtung begrenzt wird.

It is an object of the invention to provide a ring for collecting and distributing electricity, which prevents a diameter reduction of bus rings caused by thermally crimping connecting portions on windings, and an electric motor using the ring for collecting and distributing electricity, and to provide a method of manufacturing the electric motor.

• (1) According to an embodiment of the invention, there is provided a ring for collecting and distributing electricity for collecting and distributing multi-phase currents having different phases from / to a plurality of windings, comprising: a plurality of bus rings provided for the respective phases and parallel to each other along an axial direction, and an annular holder for holding the plurality of bus rings, wherein the holder comprises a plurality of separate arcuate holding elements, wherein a plurality of retaining grooves for holding the plurality of bus rings on the plurality of holding elements are formed so that they are on the outside of the holder, wherein each of the plurality of bus rings is formed by bending a single continuous wire-shaped conductor so that a plurality of held portions to be held by the holder and a plurality of connecting portions disposed between the plurality of held portions and with the Windings are connected, are arranged annularly, wherein the connecting portions of the holder projecting outwardly to be connected by crimping in a circumferential direction with the windings, and wherein a diameter reduction of the plurality of bus rings by crimping by a contact between the plurality of holding portions in the Circumference is limited.
• (2) According to another embodiment of the invention, there is provided an electric motor comprising: the ring for collecting and distributing electricity according to the above embodiment (1), a stator capable of generating a rotating magnetic field by electric currents passing through the plurality of windings and a rotor rotated by the rotating magnetic field relative to the stator.
• (3) According to another embodiment of the invention, there is provided a method of manufacturing an electric motor comprising a rotor, a stator capable of generating a magnetic field to rotate the rotor by electric currents flowing through windings, and a ring for collecting and distributing electricity for collecting and distributing multiphase streams having different phases from / to the windings, the ring for collecting and distributing electricity having a plurality of bus rings provided for the respective phases and parallel to each other an axial direction, and an annular holder for holding the plurality of bus rings, wherein the holder comprises a plurality of separate arcuate holding elements, wherein a plurality of retaining grooves for holding the plurality of bus rings on the plurality of holding elements are formed so that they are on the outside of the holder open, with each of the multiple Busr is formed by bending a single continuous wire-shaped conductor so that a plurality of held portions, which are to be held by the holder, and a plurality of connecting portions, which are arranged between the plurality of held portions and connected to the windings, are arranged annularly, wherein the Projecting connecting portions of the holder outwardly to be connected to the windings by crimping in a circumferential direction, the method comprising: arranging the plurality of bus rings parallel to each other along an axial direction, arranging the plurality of holding elements by moving from the inside toward the outside relative to the plurality of bus rings arranged in parallel so that the held portions of the plurality of bus rings are received in the plurality of retaining grooves, respectively; and bonding the plurality of bus rings to the windings by crimping the connection portions in a circumferential direction, wherein the diameter reduction of the plurality of bus rings is limited by the crimping at the time of connection by contact between the plurality of holding portions in the circumferential direction.

Effects of the invention

According to an embodiment of the invention, a ring for collecting and distributing electricity, which prevents a diameter reduction of bus rings caused by thermally crimping connecting portions on windings, and an electric motor using the ring for collecting and distributing electricity, and a Method for producing the electric motor can be provided.

Brief description of the drawings

Next, the present invention will be explained in more detail in conjunction with the accompanying drawings, wherein:

1 Fig. 12 is a schematic diagram showing a general configuration of an electric motor for explaining functions of a ring for collecting and distributing electricity in an embodiment of the present invention;

2 Fig. 12 is a perspective view showing an exemplary configuration of a core member;

3 Fig. 12 is a perspective view showing the ring for collecting and distributing electricity;

4 Fig. 11 is an exploded perspective view showing the ring for collecting and distributing electricity;

5A is a plan view showing the ring for collecting and distributing electricity;

5B a side view showing the ring for collecting and distributing electricity;

6A to 6D show an exemplary configuration of a holding element, wherein 6A a perspective view is 6B is a top view, 6C a cross-sectional view is on a line AA of 6B is taken, and 6D is a partially enlarged view showing a circumferential end of the holding member, which in 6B is shown;

7 FIG. 11 is a diagram showing a holding-element arranging step in the method of manufacturing the electric motor, and FIG

8A and 8B are explanatory diagrams showing how to connect a connecting portion of a second bus ring to an end portion of a V-phase winding, wherein 8A shows a condition before crimping and 8B shows a condition after crimping.

Detailed Description of the Preferred Embodiments

embodiment

A ring for collecting and distributing electricity and an electric motor and a method of manufacturing the electric motor in an embodiment of the invention are described with reference to FIG 1 to 8B described.

1 is a schematic diagram showing a general configuration of an electric motor 1 to illustrate functions of a ring for collecting and distributing electricity.

The electric motor 1 serves as a drive source, for example, a vehicle such as an electric car and is equipped with a rotor 2 a stator 3 and a ring for collecting and distributing electricity 4 who has a first to third bus ring 41 to 43 and a neutral busbar 44 has provided.

The rotor 2 has a wave 21 which is rotatably supported by a shaft bearing (not shown) concentric with the stator 3 to be arranged, and a cylindrical magnet 22 which is alternately magnetized in a circumferential direction with S and N and on an outer circumferential surface of the shaft 21 is fixed on. The stator 3 has a plurality of annularly arranged core elements 31 formed of a soft magnetic material and windings 32 , respectively, on the several core elements 31 are wound up.

In the present embodiment, eighteen core elements 31 ring around a rotation axis O of in 1 shown wave 21 arranged. The eighteen core elements 31 consist of six U-phase core elements 31U , six V-phase core elements 31V and six W-phase core elements 31W and are arranged so that along a rotational direction R of the rotor 2 who in 1 is shown, a V-phase core element 31V to a U-phase core element 31U adjacent, a W-phase core element 31W to the V-phase core element 31V adjoins and another U-phase core element 31U to the W-phase core element 31W borders. Although, in the present embodiment, a plurality of (eighteen) annularly arranged core elements 31 In another embodiment, a toroid may be used as the integrated multiple core elements 31 be used.

U-phase windings 32U (a subgroup of windings 32 ) are on the U-phase core elements 31U Wrapped and electricity gets over the first bus ring 41 from / to the U-phase windings 32U collected and distributed. V-phase windings 32V (another subgroup of windings 32 ) are on the V-phase core elements 31V Wrapped and electricity is via the second bus ring 42 from / to the V-phase windings 32V collected and distributed. W-phase windings 32W (another subgroup of windings 32 ) are on the W-phase core elements 31W Wrapped and electricity is via the third bus ring 43 from / to the W-phase windings 32W collected and distributed. Thus, the ring is for collecting and distributing electricity 4 capable of carrying electrical currents of different phases (U, V and W phase) from / to the multiple winding (s) ( 32U . 32V and 32W ) to collect and distribute.

Each U-phase winding 32U is arranged so that an end portion 321U which is one of two end sections, with the first bus ring 41 is electrically connected and another end portion 322U with the neutral busbar 44 electrically connected. Likewise, every V-phase winding 32V arranged so that an end section 321V which is one of two end sections, with the second bus ring 42 is electrically connected and another end portion 322V with the neutral busbar 44 electrically connected. In addition, each W-phase winding 32W arranged so that an end section 321W which is one of two end sections, with the third bus ring 43 is electrically connected and another end portion 322W with the neutral busbar 44 electrically connected.

Each of the first to third bus rings 41 to 43 has a power supply section ( 412 . 422 . 432 ) and driving currents having sinusoidal waveforms that are 120 degrees out of phase with each other are supplied from an inverter (not shown) via the power supply sections 412 . 422 and 432 fed. By the drive currents is in the stator 3 generates a rotating magnetic field. Then the magnet receives 22 a torque generated by an attractive force and a repulsive force caused by the rotating magnetic field, thus rotating the shaft 21 around the rotation axis O. In other words, the rotor 2 in relation to the stator 3 rotated by a magnetic force generated by feeding currents into the U-phase windings 32U , the V-phase windings 32V and the W-phase windings 32W is produced.

2 FIG. 16 is a perspective view illustrating an exemplary configuration of a core member. FIG 31U with the wound on it U-phase winding 32U shows. The U-phase core element 31U is done by laminating several electromagnetic steel sheets 310 formed by an insulator 33 are held, which is formed of an insulating material. The U-phase winding 32U is around the several electromagnetic steel sheets 310 wrapped, with the insulator 33 is arranged in between. The end section 321U and the other end portion 322U the U-phase winding 32U are in an axial direction of the stator 3 led out and protrude from the insulator 33 out. The V-phase core element 31V and the W-phase core element 31W are not shown in the drawing, but are in the same way as the U-phase core element 31U configured.

3 is a perspective view showing the ring for collecting and distributing electricity 4 shows. 4 Fig. 13 is an exploded perspective view illustrating the ring for collecting and distributing electricity 4 shows. 5A is a plan view showing the ring for collecting and distributing electricity 4 shows and 5B is a side view showing the ring for collecting and distributing electricity 4 shows. In the following description, a direction becomes parallel to the rotational axis O of the shaft 21 (in 1 ) is referred to as an axial direction, and a direction intersecting with the rotation axis O and also orthogonal to the axial direction is referred to as a radial direction.

The ring for collecting and distributing electricity 4 indicates the first to third bus ring 41 to 43 , the neutral busbar 44 and an annular holder 5 for holding the first to third bus rings 41 to 43 and the neutral busbar 44 on. The holder 5 consists of several separate arcuate holding elements 50 which are arranged along a circumferential direction.

The first to third bus ring 41 to 43 are arranged in the axial direction parallel to each other and are from the holder 5 held. The neutral busbar 44 becomes on the radial inside of the holder 5 held.

The first bus ring 41 has thus integrally more, of the holding elements 50 of the owner 5 held holding sections 410 , several connecting sections 411 between the several holding sections 410 are arranged and with the end sections 321U the U-phase windings 32U are connected, and the power supply section 412 , which is formed upright in the axial direction, on.

The second bus ring 42 has thus integrally more, of the holding elements 50 of the owner 5 held holding sections 420 , several connecting sections 421 between the several holding sections 420 are arranged and with the end sections 321V the V-phase windings 32V are connected, and the power supply section 422 , which is formed upright in the axial direction, on.

The third bus ring 43 has thus integrally more, of the holding elements 50 of the owner 5 held holding sections 430 , several connecting sections 431 between the several holding sections 430 are arranged and with the end sections 321W the W-phase windings 32W are connected, and the power supply section 432 , which is formed upright in the axial direction, on.

The neutral busbar 44 thus has an integral annular portion 440 which is formed in a ring shape, and a plurality of connecting portions 441 extending radially from the annular section 440 extend and each with the other end portions 322U . 322V and 322W the U, V and W phase windings 32U . 32V and 32W are connected to.

Each of the first to third bus rings 41 to 43 Has a ring shape by bending an insulated wire 400 is formed, in which a wire-shaped center conductor 400a with insulation 400b is covered. At sections of the connecting sections 411 . 421 or 431 connected to end sections of the windings 32 (the end sections 321U the U-phase windings 32U , the end sections 321V the V-phase windings 32V or the end sections 321W the W-phase windings 32W ), is the insulation 400b of the insulated wire 400 away and the center conductor 400a is exposed. The insulated wire 400 is one aspect of a "single continuous wireline conductor" of the invention.

The first bus ring 41 is by bending an insulated wire 400 so that the several held sections 410 and the multiple connection sections 411 are arranged annularly formed. Similarly, the second bus ring 42 by bending an insulated wire 400 so that the several held sections 420 and the multiple connection sections 421 are arranged annularly formed. In addition, the third bus ring 43 by bending an insulated wire 400 so that the several held sections 430 and the multiple connection sections 431 are arranged annularly formed.

The multiple connecting sections 411 of the first bus ring 41 stick out of the holder 5 to the outside and are with the end sections 321U the windings 32U connected by crimping in a circumferential direction. Likewise, the several connecting sections protrude 421 of the second bus ring 42 from the holder 5 to the outside and are with the end sections 321V the windings 32V connected by crimping in the circumferential direction. Furthermore, the plurality of connecting portions protrude 431 of the third bus ring 43 from the holder 5 to the outside and are with the end sections 321W the windings 32W connected by crimping in the circumferential direction.

The neutral busbar 44 is formed by bending a flat conductor member and integrally therewith the annular portion 440 and the multiple connection sections 441 on. The annular section 440 the neutral busbar 44 is formed by bending a band-shaped material having a predetermined thickness in a radial direction so that both longitudinal ends face each other with a narrow gap therebetween. The multiple connecting sections 441 the neutral busbar 44 are at equal intervals along the circumferential direction of the annular portion 440 arranged and are at an axial end surface of the annular portion 440 designed so that they protrude radially inwards.

The neutral busbar 44 will be on the inside of the holder 5 held while being elastically reduced in diameter, so that the gap between the two longitudinal ends of the annular portion 440 is narrowed. A restoring force of the neutral busbar 44 press the holder 5 from the inside radially outwards.

6A to 6D show an exemplary configuration of the holding member 50 of the owner 5 , in which 6A a perspective view is 6B is a top view, 6C a cross-sectional view is on a line AA of 6B is taken, and 6D a partially enlarged view is the one circumferential end of the holding element 50 shows that in 6B is shown. The first bus ring 41 and the neutral busbar 44 are in 6B and 6D dash-dotted lines and the first to third bus ring 41 to 43 are in 6C dash-dotted lines shown.

Each of the several retaining elements 50 of the owner 5 For example, it is formed by injection molding using an insulating material such as a resin and integrally has a first holding portion 51 for holding the first to third bus rings 41 to 43 and second holding sections 52 for holding the neutral busbar 44 on. In the present embodiment, six holding elements 50 arranged along the circumferential direction of the first to third bus ring. The number of retaining elements 50 however, it is not limited to this and may be three to five or not less than seven.

As in 6A shown are the first to third retaining groove 50a . 50b and 50c for holding the multiple bus rings 41 to 43 at the first holding portion 51 each retaining element 50 designed to open on the outside of the holder. The first to third holding groove 50a . 50b and 50c extend in the circumferential direction and are recessed radially inward.

As in 6B shown is the first holding section 51 of the holding element 50 curved along the circumferential direction to the circumferential curvature of the holding portions 410 . 420 and 430 the first to third bus ring 41 to 43 correspond to. The second holding sections 52 are at equal intervals along the circumferential direction on the inner circumferential surface of the holder 5 arranged, consisting of the several holding elements 50 exists, and each connection section 441 the neutral busbar 44 is between a pair of circumferentially adjacent second holding portions 52 arranged.

The first holding section 51 of the holding element 50 has an inner wall portion 510 that extends in the circumferential direction of the holder 5 extends, and a plurality of projecting wall sections 511 extending from the inner wall section 510 extend to the outside, on. In the present embodiment, the holding element 50 four projecting wall sections 511 which are provided in parallel with each other at equal intervals in the axial direction. The three retaining grooves 50a . 50b and 50c for holding the held sections 410 . 420 and 430 the first to third bus ring 41 to 43 are between the pairs of axially adjacent projecting wall portions 511 educated. The holding grooves 50a . 50b and 50c are U-shaped in cross-section and open on the outside of the holder 5 ,

The second holding section 52 has a protruding section 520 that is made of an inner circumferential surface 510a of the inner wall section 510 of the first holding section 51 protrudes radially inwardly, and a locking portion 521 extending from an inner end portion of the projecting portion 520 extends in the axial direction, on. A gap is between the locking portion 521 and the inner wall portion 510 formed and the annular portion 440 the neutral busbar 44 is held in the gap. In the present embodiment, a holding element 50 four second holding sections 52 of which two at both peripheral edges of the inner wall portion 510 are provided and the other two are provided in between, so the four second holding sections 52 are arranged at equal intervals. In this regard, the number of second holding sections 52 not limited. For example, a second holding section 52 in the circumferential direction on the entire inner peripheral surface 510a of the inner wall section 510 be educated.

The inner wall section 510 of the holding element 50 is formed so that both ends in the circumferential direction of the holder 5 in the circumferential direction over the plurality of protruding wall portions 511 and the second holding portions 52 sticks out. More precise is when looking at the holding element 50 in the axial direction, as in 6D is shown, each circumferential end of the retaining element 50 in a V-shape with a corner 500a formed as a tip in the circumferential direction and the corner 500a is on the inner wall section 510 intended. That is, each circumferential end surface of the retaining element 50 from a pair of inclined surfaces 500b and 500c are formed, which are inclined with respect to the radial direction and in opposite directions from the corner 500a extend, which is a portion of the inner wall portion 500 is. The inclined surface 500b on the inside of the corner 500a is arranged, and the inclined surface 500c on the outside of the corner 500a is disposed relative to the radial direction of the holder 5 oppositely inclined.

The inclined surface 500c on the outside of the corner 500a is arranged, has Umfangsendflächen the four projecting wall sections 511 on. The circumferential length of the projecting wall portion 511 decreases towards the front edge (outwards). Meanwhile, the inclined surface 500b on the inside of the corner 500a is arranged, partially on the second holding portion 52 at both circumferential ends of the inner wall portion 510 arranged.

6D shows one of the two circumferential ends of the retaining element 50 and the other end is symmetrical. In addition, the six retaining elements 50 holding the holder 5 form, all the same shape. If the six retaining elements 50 are arranged in the circumferential direction to the holder 5 to form are the respective corners 500a the holding elements 50 facing each other.

Next, a method of manufacturing the electric motor 1 with reference to 7 to 8B described. The electric motor 1 is manufactured by a method in which a bus ring arranging step, a holding member arranging step, a neutral bus bar arranging step, a bus ring connecting step and a bus bar connecting step are performed in this order. In the bus ring arranging step, the first to third bus rings become 41 to 43 arranged parallel to each other along the axial direction. In the holding-element arranging step, the plural holding members become 50 from inside to outside with respect to the first to third bus rings 41 to 43 which are arranged in parallel in the axial direction, shifted, so that the held portions 410 . 420 and 430 the first to third bus ring 41 to 43 each in the retaining grooves 50a to 50c be recorded. In the neutral bus bar arranging step, the neutral bus bar becomes 44 arranged so that they pass through the second holding sections 52 the plurality of retaining elements 50 is held. In the bus ring connection step, the first to third bus rings become 41 to 43 with the windings 32U . 32V and 32W by crimping the plurality of connecting sections 411 . 421 and 431 connected in the circumferential direction. In the busbar connecting step, the neutral busbar becomes 44 with the windings 32U . 32V and 32W by crimping the plurality of connecting sections 441 connected.

7 Fig. 12 is an explanatory view showing the holding member arranging step in the method of manufacturing the electric motor 1 represents and shows how the last piece of the multiple holding elements 50 should be attached.

In the holding member arranging step, the holder becomes 5 by sequentially securing the six retaining elements 50 at the first to third bus ring 41 to 43 educated. In 7 are trajectories of the corners 500a at both ends of the last holding element 50 , which is to be fastened, indicated by double-dashed lines S1 and S2. As the circumferential ends of each retaining element 50 as described above in V-shape with the corner 500a are formed as a tip in the circumferential direction, it is possible, the six holding elements 50 at the first to third bus ring 41 to 43 without contact between the last retaining element to be fastened 50 and the other already attached holding elements 50 to fix.

Once all six retaining elements 50 at the first to third bus ring 41 to 43 are attached, the respective corners 500a the holding elements 50 each other in the circumferential direction of the holder 5 facing. At the point where the holding-member arranging step is completed, at least one pair of circumferentially adjacent holding members has 50 under the six a gap between the respective corners 500a on. That is, the diameter of the holder 5 that made the six retaining elements 50 is greater at the point where the holding element arranging step is completed than when all the adjacent corners 500a the holding elements 50 are in contact with each other.

In the neutral bus bar arranging step, the neutral bus bar becomes 44 in the axial direction relative to the holder 5 that has been formed in the holding member arranging step, and the annular portion 440 the neutral busbar 44 , which is elastically reduced in diameter, is inserted so as to be between the inner circumferential surfaces 510a the inner wall sections 510 and the previous sections 520 the second holding sections 52 is trapped. The neutral busbar 44 is characterized by the holder 5 held.

8A and 8B 12 are explanatory diagrams showing the bus ring connecting step in a method of manufacturing the ring for collecting and distributing electricity 4 show, where 8A a state before crimping the connection portion 421 of the second bus ring 42 shows and 8B shows a condition after crimping.

In the bus ring connection step, the connection portions become 411 . 421 and 431 the first to third bus ring 41 to 43 crimped and with the windings 32 connected. Although only the connecting section 421 of the second bus ring 42 which is crimped as an example in 8A and 8B is shown, the connecting portions 411 and 431 the first and third bus ring 41 and 43 likewise crimped in the same way.

Each connection section 421 of the second bus ring 42 has integrally therewith a first and a second curved portion 421a and 421b that are curved to from the held section 410 project radially outward, a first and a second shaft portion 421c and 421d each extending from tip portions of the first and second curved portions 421a and 421b extend linearly outwards, and an arc section 421e having an arc shape and between respective tip portions of the first and second shaft portions 421c and 421d couples, up. The insulation 400b covers the base end portions of the first and second shaft portions 421c and 421d (End portions on the side of the first and the second curved portion 421a and 421b ). Before crimping the connection section 421 are the first and second curved sections 421a and 421b not in contact with each other and the first and second shaft sections 421c and 421d are not in contact with each other.

The second bus ring 42 comes with the V-phase winding 32V electrically connected by the connecting portion 421 on the end section 321V the winding 32V which is inserted through it, crimped. The end section 321V the winding 32V is between the first and the second shaft portion 421c and 421d arranged. In the present embodiment, the connection is performed by thermal crimping (fusing). That is, the connecting section 421 with the end section 321V the winding inserted therein is crimped under heating, whereby the second bus ring 42 with the V-phase winding 32V is electrically connected. Because the connecting section 421 is pre-plated with tin, the plated tin is melted by heat and this creates a reliable electrical connection.

The details of the thermal crimping are as follows: A positive electrode 81 becomes with the first wave section 421c of the connection section 421 brought into contact and a negative electrode 82 becomes with the second wave section 421d of the connection section 421 brought into contact and a DC voltage is between the positive electrode 81 and the negative electrode 82 created during the first and the second wave section 421c and 421d through the positive electrode 81 and the negative electrode 82 against the end section 321V the V-phase winding 32V be pressed. This results in that the first and the second shaft section 421c and 421d with the end section 321V the winding 32V to get in touch as it is in 8B what is shown is that it allows a direct current from the positive electrode 81 to the negative electrode 82 over the first wave section 421c of the connection section 421 , the end section 321V the winding 32V and the second shaft portion 421d flows. Then, the resulting Joule heat first melts the plated tin, and then partially melts the first and second wave portions 421c and 421d of the connection section 421 as well as the end section 321V the V-phase winding 32V , The connecting section 421 of the second bus ring 42 is characterized by the end portion 321V the V-phase winding 32V connected.

Because the first and the second curved section 421a and 421b due to the thermal crimping come into contact with each other, the diameter of the second bus ring 42 slightly reduced. In the bus ring connection step, since all the connection sections 411 . 421 and 431 the first to third bus ring 41 to 43 in the same manner as described above, the diameters of the first to third bus rings are thermally crimped 41 to 43 is gradually reduced with the progress of the bus ring connection step.

The column between the several holding elements 50 of the owner 5 are due to the diameter reduction of the first to third bus ring 41 to 43 narrowed and as soon as the diameters of the first to third bus rings 41 to 43 are reduced by more than a predetermined amount adjacent holding elements 50 to each other at the respective corners 500a to how it is in 8B is shown. After that, the gaps between the holding elements 50 no longer narrows and thus the diameter of the holder 5 no longer reduced. This results in a further diameter reduction of the first to third bus ring 41 to 43 through the holder 5 limited. In other words, in the bus ring connection step, one is by thermally crimping the connection portions 411 . 421 and 431 caused diameter reduction of the first to third bus ring 41 to 43 by a contact between the plurality of holding elements 50 limited in the circumferential direction.

After that, in the busbar connecting step, the plural connecting portions become 441 the neutral busbar 44 with the other end sections 322U . 322V and 322W the U, V and W phase windings 32U . 32V and 32W crimped and connected. This is the electric motor 1 completed.

Functions and Effects of the Embodiments

• (1) Die Durchmesserreduktion des ersten bis dritten Busrings 41 bis 43 während des Busring-Verbindungsschritts wird durch einen Kontakt zwischen den mehreren Halteelementen 50 in der Umfangsrichtung begrenzt. Dies verhindert, dass sich die Verbindungsabschnitte 411, 421 und 431 und die anderen Endabschnitte 322U, 322V und 322W der Wicklungen 32U, 32V und 32W während des Busring-Verbindungsschritts fehlerhaft ausgerichtet werden und somit ist es möglich, eine Erhöhung der Arbeitszeit zu verhindern.
• (2) Der Innenwandabschnitt 510 des Halteelements 50 ist so ausgebildet, dass beide Enden in der Umfangsrichtung in der Umfangsrichtung über die vorstehenden Wandabschnitte 511 hinaus ragen und jedes Umfangsende des Halteelements 50 in einer V-Form ausgebildet ist, deren Spitze in der Umfangsrichtung die Ecke 500a ist, die auf dem Innenwandabschnitt 510 angeordnet ist. Aufgrund einer solchen Konfiguration wird ein Kontakt zwischen dem letzten zu befestigenden Halteelement 50 und den anderen Halteelementen 50 während des Halteelement-Anordnungsschritts vermieden und eine Verarbeitbarkeit zu dem Zeitpunkt der Befestigung verbessert. Zusätzlich wirkt selbst dann, wenn der Halter 5 aufgrund der Durchmesserreduktion des ersten bis dritten Busrings 41 bis 43 zusammengezogen wird, die zugehörige Kraft auf die Innenwandabschnitte 510 mit relativ hoher Festigkeit und nicht auf die mehreren vorstehenden Wandabschnitte 511. Daher wird verhindert, dass der Halter 5 beschädigt oder verformt wird.
• (3) Da die neutrale Sammelschiene 44 im Inneren des Halters 5 gehalten wird, während sie während des Busring-Verbindungsschritts elastisch im Durchmesser reduziert wird, kann eine Rückstellkraft der neutralen Sammelschiene 44 dazu beitragen, eine Durchmesserreduktion des ersten bis dritten Busringes 41 bis 43 zu verhindern, die durch thermisches Crimpen verursacht werden. Mit anderen Worten ist es möglich, den oben beschriebenen Effekt (1) weiter zu verbessern.

In the present embodiment, the following functions and effects are obtained.

• (1) The diameter reduction of the first to third bus rings 41 to 43 during the bus ring connection step, contact is established between the plurality of support elements 50 limited in the circumferential direction. This prevents the connecting sections 411 . 421 and 431 and the other end sections 322U . 322V and 322W the windings 32U . 32V and 32W during the bus ring connection step are misaligned and thus it is possible to prevent an increase in the working time.
• (2) The inner wall section 510 of the holding element 50 is formed so that both ends in the circumferential direction in the circumferential direction on the projecting wall portions 511 extend beyond and each circumferential end of the retaining element 50 is formed in a V-shape whose tip in the circumferential direction of the corner 500a that's on the inside wall section 510 is arranged. Due to such a configuration, contact between the last holding member to be fixed becomes 50 and the other holding elements 50 during the holding member arranging step and improves workability at the time of fixing. In addition, even if the holder acts 5 due to the diameter reduction of the first to third bus rings 41 to 43 is contracted, the associated force on the inner wall sections 510 with relatively high strength and not on the several projecting wall sections 511 , Therefore, the holder is prevented 5 damaged or deformed.
• (3) Since the neutral busbar 44 inside the holder 5 While it is elastically reduced in diameter during the bus ring connecting step, a restoring force of the neutral bus bar can be maintained 44 contribute to a diameter reduction of the first to third bus ring 41 to 43 to prevent caused by thermal crimping. In other words, it is possible to further improve the above-described effect (1).

Summary of the embodiments

• [1] Ein Ring zum Sammeln und Verteilen von Elektrizität (4) zum Sammeln und Verteilen von Mehrphasenströmen mit unterschiedlichen Phasen von/auf mehrere(n) Wicklungen (32U, 32V, 32W), wobei der Ring zum Sammeln und Verteilen von Elektrizität (4) umfasst: mehrere Busringe (41 bis 43), die für die jeweiligen Phasen bereitgestellt sind und parallel zueinander entlang einer axialen Richtung angeordnet sind, und einen ringförmigen Halter (5) zum Halten der mehreren Busringe (41 bis 43), wobei der Halter (5) mehrere separate bogenförmige Halteelemente (50) umfasst, wobei mehrere Haltenuten (50a, 50b, 50c) zum Halten der mehreren Busringe (41 bis 43) an den mehreren Halteelementen (50) so ausgebildet sind, dass sie sich auf der Außenseite des Halters (5) öffnen, wobei jeder der mehreren Busringe (41 bis 43) durch Biegen eines einzelnen kontinuierlichen drahtförmigen Leiters so ausgebildet ist, dass mehrere gehaltene Abschnitte (410, 420, 430), die von dem Halter (5) gehalten werden sollen, und mehrere Verbindungsabschnitte (411, 421, 431), die zwischen den mehreren gehaltenen Abschnitten (410, 420, 430) angeordnet sind und mit den Wicklungen (32U, 32V, 32W) verbunden sind, ringförmig angeordnet sind, wobei die Verbindungsabschnitte (411, 421, 431) von dem Halter (5) nach außen vorstehen, um durch Crimpen in einer Umfangsachtung mit den Wicklungen (32U, 32V, 32W) verbunden zu werden, und wobei eine Durchmesserreduktion der mehreren Busringe (41 bis 43) durch das Crimpen durch einen Kontakt zwischen den mehreren Halteabschnitten (50) in der Umfangsrichtung begrenzt wird.
• [2] Der in [1] beschriebene Ring zum Sammeln und Verteilen von Elektrizität (4), wobei jedes der mehreren Halteelemente (50) einen Innenwandabschnitt (510), der sich in Umfangsrichtung des Halters (5) erstreckt, und mehrere vorstehende Wandabschnitte (511), die sich von dem Innenwandabschnitt (510) nach außen erstrecken, umfasst, die Haltenuten (50a, 50b, 50c) zwischen den mehreren vorstehenden Wandabschnitten (511) ausgebildet sind, beide Umfangsenden des Innenwandabschnitts (510) in einer Umfangsrichtung über die mehreren vorstehenden Wandabschnitte (511) hinaus ragen und der Halter (5) dazu ausgelegt ist, dass die Innenwandabschnitte (510) der mehreren Halteelemente (50) durch das Crimpen in Kontakt miteinander gelangen.
• [3] Der in [1] oder [2] beschriebene Ring zum Sammeln und Verteilen von Elektrizität (4), der ferner umfasst: einen ringförmigen neutralen Leiter (44), der mit Endabschnitten (322U, 322W, 322W) der mehreren Wicklungen (32U, 32V, 32W) verbunden ist, die die Endabschnitte gegenüber den Endabschnitten (321U, 321V, 321W) sind, die mit den mehreren Busringen (41 bis 43) verbunden sind, wobei der ringförmige Leiter (44) auf der Innenseite des Halters (5) gehalten wird, während er im Durchmesser elastisch verringert ist.
• [4] Elektromotor (1), der umfasst: den Ring zum Sammeln und Verteilen von Elektrizität (4), der in einem von [1] bis [3] beschrieben ist; einen Stator (3), der in der Lage ist, ein rotierendes Magnetfeld durch elektrische Ströme zu erzeugen; Wicklungen (32U, 32V, 32W); und einen Rotor (2), der durch das rotierende Magnetfeld relativ zu dem Stator (3) gedreht wird.
• [5] Verfahren zum Herstellen eines Elektromotors (1), der einen Rotor (2), einen Stator (3), der in der Lage ist, ein Magnetfeld zu erzeugen, um den Rotor (2) durch elektrische Ströme zu drehen, die durch Wicklungen (32) fließen, und einen Ring zum Sammeln und Verteilen von Elektrizität (4) zum Sammeln und Verteilen von Mehrphasenströmen mit unterschiedlichen Phasen von/auf den/die (32U, 32V, 32W) umfasst, wobei der Ring zum Sammeln und Verteilen von Elektrizität (4) mehrere Busringe (41 bis 43), die für die jeweiligen Phasen bereitgestellt sind und parallel zueinander entlang einer axialen Richtung angeordnet sind, und einen ringförmigen Halter (5) zum Halten der mehreren Busringe (41 bis 43) umfasst, wobei der Halter (5) mehrere separate bogenförmige Halteelemente (50) umfasst, wobei mehrere Halteelemente (50a, 50b, 50c) zum Halten mehreren Busringe (41 bis 43) auf den mehreren Halteelementen (50) so ausgebildet sind, dass sie sich auf der Außenseite des Halters (5) öffnen, wobei jeder der mehreren Busringe (41 bis 43) durch Biegen eines einzelnen kontinuierlichen drahtförmigen Leiters so ausgebildet ist, dass mehrere gehaltene Abschnitte (410, 420, 430), die durch den Halter (5) gehalten werden sollen, und mehrere Verbindungsabschnitte (411, 421, 431), die zwischen den mehreren gehaltenen Abschnitten (410, 420, 430) angeordnet sind und mit den Wicklungen (32U, 32V, 32W) verbunden sind, ringförmig angeordnet sind, und die Verbindungsabschnitte (411, 421, 431) von dem Halter (5) nach außen ragen, um durch Crimpen in einer Umfangsrichtung mit den Wicklungen (32U, 32V, 32W) verbunden zu werden, wobei das Verfahren umfasst: Anordnen der mehreren Halteelemente (50) parallel zueinander entlang einer axialen Richtung; Anordnen der mehreren Halteelemente (50) durch Verschieben von der Innenseite in Richtung der Außenseite relativ zu den mehreren Busringen (41 bis 43), so dass die gehaltenen Abschnitte (410, 420, 430) der mehreren Busringe (41 bis 43) jeweils in den mehreren Haltenuten (50a, 50b, 50c) aufgenommen werden; und Verbinden der mehreren Busringe (41 bis 43) mit den Wicklungen (32) durch Crimpen der Verbindungsabschnitte (411, 421, 431) in einer Umfangsrichtung, wobei die Durchmesserreduktion der mehreren Busringe (41 bis 43) durch das Crimpen zu dem Zeitpunkt des Verbindens durch einen Kontakt zwischen den mehreren Halteabschnitten (50) in der Umfangsrichtung begrenzt wird.

Technical ideas that will be understood from the embodiment described above are described below with reference to the reference numerals used for the embodiment. However, each reference numeral, etc. described below is not intended to limit the constituent elements in the claims to the elements as specifically described in the embodiment.

• [1] A ring for collecting and distributing electricity ( 4 ) for collecting and distributing multiphase currents having different phases from / to a plurality of windings ( 32U . 32V . 32W ), the ring for collecting and distributing electricity ( 4 ) comprises: a plurality of bus rings ( 41 to 43 ) provided for the respective phases and arranged parallel to each other along an axial direction, and an annular holder (FIG. 5 ) for holding the plurality of bus rings ( 41 to 43 ), the holder ( 5 ) a plurality of separate arcuate holding elements ( 50 ), wherein a plurality of retaining grooves ( 50a . 50b . 50c ) for holding the plurality of bus rings ( 41 to 43 ) at the plurality of retaining elements ( 50 ) are formed so that they are on the outside of the holder ( 5 ), each of the multiple bus rings ( 41 to 43 ) is formed by bending a single continuous wire-shaped conductor such that a plurality of held sections ( 410 . 420 . 430 ) coming from the holder ( 5 ) and several connecting sections ( 411 . 421 . 431 ) between the several held sections ( 410 . 420 . 430 ) are arranged and with the windings ( 32U . 32V . 32W ) are arranged annularly, wherein the connecting portions ( 411 . 421 . 431 ) of the holder ( 5 ) protrude outwardly to crimp circumferentially with the windings (FIG. 32U . 32V . 32W ) and wherein a diameter reduction of the plurality of bus rings ( 41 to 43 ) by the crimping by a contact between the plurality of holding portions ( 50 ) is limited in the circumferential direction.
• [2] The ring described in [1] for collecting and distributing electricity ( 4 ), wherein each of the plurality of retaining elements ( 50 ) one Inner wall section ( 510 ) extending in the circumferential direction of the holder ( 5 ), and a plurality of projecting wall sections (FIG. 511 ) extending from the inner wall section (FIG. 510 ) extend outwardly, the retaining grooves ( 50a . 50b . 50c ) between the plurality of projecting wall portions ( 511 ) are formed, both circumferential ends of the inner wall portion ( 510 ) in a circumferential direction over the plurality of protruding wall portions (FIG. 511 ) and the holder ( 5 ) is designed so that the inner wall sections ( 510 ) of the plurality of retaining elements ( 50 ) come into contact with each other by crimping.
• [3] The ring for collecting and distributing electricity described in [1] or [2] 4 ), further comprising: an annular neutral conductor ( 44 ), with end sections ( 322U . 322W . 322W ) of the several windings ( 32U . 32V . 32W ) connecting the end sections to the end sections ( 321U . 321V . 321W ), which are connected to the several bus rings ( 41 to 43 ), wherein the annular conductor ( 44 ) on the inside of the holder ( 5 ) while being elastically reduced in diameter.
• [4] electric motor 1 ), comprising: the ring for collecting and distributing electricity ( 4 ) described in any one of [1] to [3]; a stator ( 3 ) capable of generating a rotating magnetic field by electric currents; Windings ( 32U . 32V . 32W ); and a rotor ( 2 ) caused by the rotating magnetic field relative to the stator ( 3 ) is rotated.
• [5] Method for manufacturing an electric motor ( 1 ), which has a rotor ( 2 ), a stator ( 3 ) which is capable of generating a magnetic field around the rotor ( 2 ) to be rotated by electrical currents through windings ( 32 ), and a ring for collecting and distributing electricity ( 4 ) for collecting and distributing multiphase streams having different phases from / to the ( 32U . 32V . 32W ), the ring for collecting and distributing electricity ( 4 ) several bus rings ( 41 to 43 ) provided for the respective phases and arranged parallel to each other along an axial direction, and an annular holder (FIG. 5 ) for holding the plurality of bus rings ( 41 to 43 ), wherein the holder ( 5 ) a plurality of separate arcuate holding elements ( 50 ), wherein a plurality of retaining elements ( 50a . 50b . 50c ) for holding multiple bus rings ( 41 to 43 ) on the plurality of retaining elements ( 50 ) are formed so that they are on the outside of the holder ( 5 ), each of the multiple bus rings ( 41 to 43 ) is formed by bending a single continuous wire-shaped conductor such that a plurality of held sections ( 410 . 420 . 430 ) through the holder ( 5 ) and several connecting sections ( 411 . 421 . 431 ) between the several held sections ( 410 . 420 . 430 ) are arranged and with the windings ( 32U . 32V . 32W ) are arranged annularly, and the connecting portions ( 411 . 421 . 431 ) of the holder ( 5 ) project outwardly to crimp in a circumferential direction with the windings ( 32U . 32V . 32W ), the method comprising: arranging the plurality of holding elements ( 50 ) parallel to each other along an axial direction; Arranging the plurality of retaining elements ( 50 by moving from the inside towards the outside relative to the plurality of bus rings ( 41 to 43 ), so that the held sections ( 410 . 420 . 430 ) of the multiple bus rings ( 41 to 43 ) each in the plurality of retaining grooves ( 50a . 50b . 50c ) are recorded; and connecting the plurality of bus rings ( 41 to 43 ) with the windings ( 32 ) by crimping the connecting sections ( 411 . 421 . 431 ) in a circumferential direction, wherein the diameter reduction of the plurality of bus rings ( 41 to 43 ) by crimping at the time of joining by contact between the plurality of holding portions (FIG. 50 ) is limited in the circumferential direction.

Although the embodiment of the invention has been described, the invention according to the claims is not limited to the embodiment. It should also be noted that not all combinations of the features described in the embodiment are necessary to solve the problem of the invention.

In addition, the invention can be suitably modified and implemented without departing from its essence. For example, although the circumferential end surfaces of all the retaining elements 50 in the embodiment in a V-shape with the corner 500a are designed as a tip, the invention is not limited thereto. It may just be the last holding element 50 to be fixed in the holding member arranging step, be formed to have such a shape. However, if all of the multiple holding elements 50 have the same shape as in the embodiment, the same component can be used in common, and it is thereby possible to reduce the manufacturing cost.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2015-46958 A [0002, 0003, 0005]

Claims (5)

A ring for collecting and distributing electricity for collecting and distributing multi-phase currents having different phases from / to a plurality of windings, comprising: a plurality of bus rings provided for the respective phases and arranged parallel to each other along an axial direction, and an annular holder for holding the plurality of bus rings, wherein the holder comprises a plurality of separate arcuate holding elements, wherein a plurality of retaining grooves for holding the plurality of bus rings on the plurality of holding members are formed so as to open on the outside of the holder, wherein each of the plurality of bus rings is formed by bending a single continuous wire-shaped conductor so that a plurality of held portions to be held by the holder and a plurality of connection portions interposed between the plurality of held portions and connected to the windings are arranged annularly are, wherein the connecting portions project outwardly from the holder to be connected to the coils by crimping in a circumferential direction, and wherein a diameter reduction of the plurality of bus rings is limited by the crimping by a contact between the plurality of holding portions in the circumferential direction. A ring for collecting and distributing electricity according to claim 1, wherein each of said plurality of holding members has an inner wall portion (FIG. 510 ) extending in the circumferential direction of the holder, and a plurality of projecting wall portions which extend from the inner wall portion to the outside, wherein the retaining grooves ( 50a . 50b . 50c ) between the plurality of projecting wall portions ( 511 ) are formed, wherein both circumferential ends of the inner wall portion ( 510 ) in a circumferential direction over the plurality of protruding wall portions (FIG. 511 ) and the holder ( 5 ) is designed so that the inner wall sections ( 510 ) of the plurality of retaining elements ( 50 ) come into contact with each other by crimping. A ring for collecting and distributing electricity according to claim 1 or 2, further comprising: an annular neutral conductor connected to end portions of the plurality of windings, which are the end portions opposite to end portions connected to the plurality of bus rings, wherein the annular conductor is held on the inside of the holder while being elastically reduced in diameter. Electric motor comprising: the ring for collecting and distributing electricity according to any one of claims 1 to 3; a stator capable of generating a rotating magnetic field by electric currents flowing through the plurality of windings; and a rotor which is rotated by the rotating magnetic field relative to the stator. A method of manufacturing an electric motor comprising a rotor, a stator capable of generating a magnetic field, rotating the rotor by electric currents flowing through windings, and a ring for collecting and distributing electricity for collecting and Distributing multiphase currents having different phases from / to the windings, the ring for collecting and distributing electricity having a plurality of bus rings provided for the respective phases and arranged parallel to each other along an axial direction, and an annular holder for holding the plurality of bus rings, wherein the holder comprises a plurality of separate arcuate holding elements, wherein a plurality of retaining grooves for holding the plurality of bus rings on the plurality of holding elements are formed so that they open on the outside of the holder, wherein each of the plurality of bus rings by bending a single continuous wire-shaped conductor so out is formed that a plurality of held portions which are to be held by the holder, and a plurality of connecting portions which are arranged between the plurality of held portions and connected to the windings, are arranged annularly, wherein the connecting portions of the holder projecting outwardly crimping in a circumferential direction to be connected to the windings, the method comprising: arranging the plurality of bus rings parallel to each other along an axial direction, arranging the plurality of holding elements by shifting from the inside toward the outside relative to the plurality of bus rings arranged in parallel are so that the held portions of the plurality of bus rings are respectively received in the plurality of retaining grooves; and bonding the plurality of bus rings to the windings by crimping the connecting portions in a circumferential direction, wherein the diameter reduction of the plurality of bus rings by crimping at the time of connecting by contact between the plurality of bus rings Holding portions is limited in the circumferential direction.

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