JP6814383B2 - Wiring members for electric motors and electric motors - Google Patents

Description

The present invention relates to a wiring member for an electric motor and an electric motor.

Conventionally, windings used in electric motors have a problem that discharge is generated by a surge voltage and the durability of the winding deteriorates.

To solve this problem, for example, as described in Patent Document 1, it is possible to suppress the occurrence of electric discharge by devising an insulating material to be applied to the conductor or increasing the film thickness of the insulating material to be applied to the conductor. It is done.

As other prior art document information related to the invention of this application, there is Patent Document 2.

JP 2015-228285 Japanese Unexamined Patent Publication No. 2009-247092

However, in the method of Patent Document 1 described above, the cost of winding may increase by using a high-cost insulating material, and the winding becomes large by increasing the film thickness of the insulating material. There was a problem that it could be transformed.

Therefore, an object of the present invention is to provide a wiring member for an electric motor and an electric motor capable of suppressing the generation of electric discharge due to a surge voltage while suppressing the cost of windings and the increase in size of windings.

For the purpose of solving the above problems, the present invention is a U-phase winding in which U-phase, V-phase, and W-phase drive currents having different phases by 120 ° are supplied, and the U-phase drive current is supplied. A wiring member for an electric motor provided in an electric motor provided with a V-phase winding to which the V-phase drive current is supplied and a W-phase winding to which the W-phase drive current is supplied. It is electrically connected to the phase winding and has a U-phase feeding terminal for connecting a U-phase feeding path for supplying the U-phase drive current, and the U-phase feeding path from the U-phase feeding path. To connect the U-phase wiring unit that supplies the drive current to the U-phase winding and the V-phase power supply path that is electrically connected to the V-phase winding and supplies the drive current of the V-phase. A V-phase wiring unit that has a V-phase feeding terminal and supplies the V-phase drive current from the V-phase feeding path to the V-phase winding is electrically connected to the W-phase winding. The W phase feeding terminal for connecting the W phase feeding path for supplying the W phase driving current is provided, and the W phase driving current from the W phase feeding path is supplied to the W phase winding. Provided is a wiring member for an electric current, comprising a phase wiring portion, an annular magnetic core that collectively covers the U-phase wiring portion, the V-phase wiring portion, and the W-phase wiring portion.

Further, the present invention provides an electric motor provided with the wiring member for the electric motor for the purpose of solving the above problems.

According to the present invention, it is possible to provide a wiring member for an electric motor and an electric motor capable of suppressing the generation of discharge due to a surge voltage while suppressing the cost of winding and the increase in size of winding.

It is a schematic block diagram of the electric motor which concerns on one Embodiment of this invention. It is a perspective view of the wiring member for an electric motor. It is a perspective view of the wiring member for an electric motor. It is a perspective view of the wiring part in the wiring member for an electric motor. It is an exploded perspective view which showed the magnetic core and the holding part by disassembling. FIG. 2 is a cross-sectional view taken along the line AA of FIG.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of an electric motor according to the present embodiment.

As shown in FIG. 1, the electric motor 1 is used as a drive source for traveling a vehicle such as an electric vehicle, and has a rotor 2 as a rotor, a stator 3 as a stator, and a wiring member 4 for the electric motor. And have.

The rotor 2 is fixed to the outer peripheral surface of the shaft 21 which is rotatably supported coaxially with the stator 3 by bearings (not shown), and the north and south poles are alternately magnetized along the circumferential direction. It has a cylindrical magnet 22 and the like.

The stator 3 has a plurality of cores 31 made of soft magnetic materials arranged in an annular shape, and windings 32 wound around the outer periphery of the core 31.

In the present embodiment, the 24 cores 31 are arranged in an annular shape about 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 rotation direction R of the rotor 2 shown in FIG. Along, the V-phase core 31V is next to the U-phase core 31U, the W-phase core 31W is next to the V-phase core 31V, and the U-phase core 31U is next to the W-phase core 31W. Have been placed. In the present embodiment, the case where each of the plurality (24) cores 31 is a separate body will be described, but the plurality of cores 31 may be integrally formed.

A U-phase winding 32U is wound around the U-phase core 31U as a winding 32. A V-phase winding 32V is wound around the V-phase core 31V as a winding 32. A W-phase winding 32W is wound around the W-phase core 31W as a winding 32.

The electric motor wiring member 4 includes a U-phase wiring unit 41, a V-phase wiring unit 42, a W-phase wiring unit 43, and a neutral-phase wiring unit 44. The U-phase wiring unit 41 is electrically connected to the U-phase winding 32U, the V-phase wiring unit 42 is electrically connected to the V-phase winding 32V, and the W-phase wiring unit 43 is electrically connected to the W-phase winding 32W. The details of the wiring member 4 for the electric motor will be described later.

Of both ends of the U-phase winding 32U, one end 321U is electrically connected to the U-phase wiring 41, and the other end 322U is electrically connected to the neutral-phase wiring 44. Similarly, of both ends of the V-phase winding 32V, one end 321V is electrically connected to the V-phase wiring portion 42, and the other end 322V is electrically connected to the neutral-phase wiring portion 44. Similarly, of both ends of the W-phase winding 32W, one end 321W is electrically connected to the W-phase wiring portion 43, and the other end 322W is electrically connected to the neutral-phase wiring portion 44. ..

The electric motor 1 is supplied with drive currents of U-phase, V-phase, and W-phase, which are 120 ° out of phase with each other, via the electric motor wiring member 4. The U-phase wiring unit 41 has a U-phase feeding terminal 413 for connecting a U-phase feeding path (not shown) for supplying a U-phase driving current, and a U-phase driving current from the U-phase feeding path. Is supplied to the U-phase winding 32U. The V-phase wiring unit 42 has a V-phase feeding terminal 423 for connecting a V-phase feeding path (not shown) for supplying a V-phase driving current, and V-phase driving current from the V-phase feeding path is V. It is supplied to the phase winding 32V. The W-phase wiring unit 43 has a W-phase feeding terminal 433 for connecting a W-phase feeding path (not shown) for supplying a W-phase driving current, and causes the W-phase driving current from the W-phase feeding path to be W. It is supplied to the phase winding 32W.

As described above, in the motor 1, the U-phase drive current is supplied to the U-phase winding 32U via the U-phase wiring portion 41, and the V-phase drive current is supplied to the V-phase winding 32V via the V-phase wiring portion 42. The W-phase drive current is supplied to the W-phase winding 32W via the W-phase wiring unit 43. The U-phase power supply path, the V-phase power supply path, and the W-phase power supply path may be, for example, a wire harness cable extending from an inverter (not shown). Further, for example, when the electric motor 1 and the inverter are integrally configured, the U-phase power supply path, the V-phase power supply path, and the W-phase power supply path may be bus bar terminals extending from the inverter.

When the U-phase winding 32U, the V-phase winding 32V, and the W-phase winding 32W are supplied with the U-phase, V-phase, and W-phase drive currents whose phases are shifted by 120 °, a rotating magnetic field is generated in the stator 3. The magnet 22 is formed, and the magnet 22 receives a rotational force due to the attractive force and the repulsive force generated by the rotating magnetic field to rotate the shaft 21 around its rotation axis O. That is, the rotor 2 rotates with respect to the stator 3 by the magnetic force generated by energizing the U-phase winding 32U, the V-phase winding 32V, and the W-phase winding 32W. The phrase "the phase is shifted by 120 °" includes not only the case where the phase difference is exactly 120 ° but also the case where the phase difference is shifted by several degrees from 120 °.

Further, when the vehicle is decelerated, the current induced in each winding 32 by the rotation of the shaft 21 and the magnet 22 is output to the inverter via the electric motor wiring member 4. This current is converted from alternating current to direct current by the inverter and supplied as a charging current to the storage battery shown in the figure.

(Explanation of Wiring Member 4 for Electric Motor)
2 and 3 are perspective views of the wiring member 4 for the electric motor. In the following description, the direction parallel to the rotation axis O of the shaft 21 is simply referred to as an axial direction. Further, in the following description, the direction orthogonal to the axial direction is simply referred to as a radial direction, and the direction orthogonal to the axial direction and the radial direction is simply referred to as a circumferential direction.

As shown in FIGS. 2 and 3, the U-phase wiring portion 41, the V-phase wiring portion 42, and the W-phase wiring portion 43 in the electric motor wiring member 4 extend in the circumferential direction and are formed in an annular shape. A plurality of connection portions 411,421 provided on the main body portions 410, 420, 430 and connected to the windings 32 (U-phase winding 32U, V-phase winding 32V, and W-phase winding 32W). , 431, and the bus ring having. In addition, in FIG. 2 and FIG. 3, the neutral phase wiring portion 44 is omitted.

More specifically, the U-phase wiring portion 41 includes a main body portion 410 formed in an annular shape and a plurality of (four in the present embodiment) connecting portions 411 connected to one end portion 321U of the U-phase winding 32U. And a power feeding unit 412 formed by rising from the main body 410 in the axial direction are integrally provided. The power supply unit 412 is provided with a U-phase power supply terminal 413 connected to a U-phase power supply path (cable or the like).

The V-phase wiring portion 42 is formed from the main body portion 420 formed in an annular shape, a plurality of connection portions 421 (four in the present embodiment) connected to one end portion 321V of the V-phase winding 32V, and the main body portion 420. It integrally has a power feeding unit 422 formed by standing up in the axial direction. The power supply unit 422 is provided with a V-phase power supply terminal 423 connected to a V-phase power supply path (cable or the like).

The W-phase wiring portion 43 is formed from the main body portion 430 formed in an annular shape, a plurality of connection portions 431 (four in the present embodiment) connected to one end portion 321W of the W-phase winding 32W, and the main body portion 430. It integrally has a power feeding unit 432 formed by standing up in the axial direction. The power supply unit 432 is provided with a W-phase power supply terminal 433 connected to a W-phase power supply path (cable or the like).

FIG. 4 is a perspective view of the U-phase wiring unit 41, the V-phase wiring unit 42, and the W-phase wiring unit 43. As shown in FIG. 4, each of the wiring portions 41 to 43 uses an insulated wire having a linear central conductor 400a covered with an insulator 400b, and the insulator 400b of the portion to be the connecting portion 411, 421, 431. The insulated wire from which is removed is curved in an annular shape. Both ends of the insulated wire serve as feeding portions 421, 422, 432. In the present embodiment, the central conductor 400a is a metal linear body made of single-core copper or the like, and the wiring portions 41 to 43 are formed by plastic deformation and have rigidity not to be deformed by their own weight.

The connection portions 411, 421 and 431 of the wiring portions 41 to 43 are formed in a portion where the insulator 400b is removed and the central conductor 400a, which is a single wire, is exposed. The plurality of connecting portions 411 of the U-phase wiring portion 41 project inward in the radial direction from the main body portion 410 by bending the central conductor 400a. Similarly, the plurality of connecting portions 421 of the V-phase wiring portion 42 project inward in the radial direction from the main body portion 420 by bending the central conductor 400a. Similarly, the plurality of connecting portions 431 of the W-phase wiring portion 43 project inward in the radial direction from the main body portion 430 by bending the central conductor 400a.

Each connection portion 411, 421, 431 is formed in a substantially U shape (Ω shape in the present embodiment) that is convex inward in the radial direction, and windings 32U, 32V, 32W are formed in the hollow portion thereof. The windings 32U, 32V, 32W and the wiring portions 41 to 43 are electrically connected by performing thermal clamping (fusing) with one end portions 321U, 321V, 321W inserted.

The plurality of connection portions 411 of the U-phase wiring portion 41, the connection portion 421 of the V-phase wiring portion 42, and the connection portion 431 of the W-phase wiring portion 43 do not overlap in the axial direction and have equal intervals in the circumferential direction. Is set to. In addition, "the intervals are set to be equal" may not be completely equal, and may be deviated by, for example, about 0.1 mm to 2.0 mm.

The power feeding portion 412 of the U-phase wiring portion 41 is formed by a pair of extending portions 412a extending outward in the radial direction and a pair of rising portions 412b formed by rising in the axial direction from the tip portions of the pair of extending portions 412a. And have. A U-phase feeding terminal 413 is connected to the central conductor 400a exposed from the insulator 400b in the pair of rising portions 412b, and a U-phase driving current is supplied through the U-phase feeding terminal 413.

Similarly, the power feeding portion 422 of the V-phase wiring portion 42 is formed by a pair of extending portions 422a extending outward in the radial direction and a pair of extending portions 422a rising in the axial direction from the tip portions of the pair of extending portions 422a. It has a rising portion 422b. A V-phase feeding terminal 423 is connected to the central conductor 400a exposed from the insulator 400b in the pair of rising portions 422b, and a V-phase driving current is supplied via the V-phase feeding terminal 423.

Similarly, the power feeding portion 432 of the W-phase wiring portion 43 is formed by a pair of extending portions 432a extending outward in the radial direction and a pair of extending portions 432a rising in the axial direction from the tip portions of the pair of extending portions 432a. It has a rising portion 432b of. A W-phase feeding terminal 433 is connected to the central conductor 400a exposed from the insulator 400b in the pair of rising portions 432b, and a W-phase driving current is supplied via the W-phase feeding terminal 433.

Further, the wiring member 4 for the electric motor includes a plurality of main body holding portions 7 that hold and fix the main bodies 410, 420, 430 of the wiring portions 41 to 43 to each other. The main body holding portion 7 collectively covers the periphery of the main bodies 410, 420, 430 of each wiring portion 41 to 43 (so as to collectively cover a part of each main body portion 410, 420, 430 in the circumferential direction). In), it is an integrally molded product made of resin formed by molding an insulating resin. As the insulating resin used for the main body holding portion 7, for example, PPS (polyphenylene sulfide) can be used.

In the present embodiment, a plurality of (24 in this case) main body holding portions 7 are arranged at equal intervals along the circumferential direction of the main body portions 410, 420, 430. Further, the plurality of main body holding portions 7 are provided so as to be located between the connecting portions 411, 421 and 431 adjacent to each other in the circumferential direction.

(Explanation of magnetic core)
FIG. 5 is an exploded perspective view showing the magnetic core and the holding portion in an exploded manner. Further, FIG. 6 is a cross-sectional view taken along the line AA of FIG.

As shown in FIGS. 5 and 6, the wiring member 4 for an electric motor according to the present embodiment is an annular magnetic material that collectively covers the U-phase wiring portion 41, the V-phase wiring portion 42, and the W-phase wiring portion 43. It also has a core 5.

In the present embodiment, the magnetic core 5 is provided with the magnetic core 5 so as to collectively cover the periphery of the rising portions 421b, 422b, and 432b of the feeding portions 421, 422 and 432 of the wiring portions 41 to 43. ing. That is, the magnetic core 5 is provided between the feeding terminals 413, 423, 433 and the connecting portions 411, 421, 431.

When the magnetic core 5 is provided so as to cover the wiring portions 41 to 43, the central conductor 400a of the wiring portions 41 to 43 and the magnetic core 5 are electromagnetically coupled to increase the impedance. Since the surge voltage input to the wiring member 4 for the electric motor is divided and applied to this impedance and the impedance of the winding 32, it is applied to the winding 32 by providing the magnetic core 5. It becomes possible to suppress the surge voltage. As a result, it is possible to prevent the winding 32 from being discharged and the durability of the winding 32 being deteriorated.

Further, since the total value of the U-phase, V-phase, and W-phase drive currents excluding surge voltage and noise becomes zero, the magnetic core 5 is provided so as to collectively cover the wiring portions 41 to 43. As a result, the magnetic field that tries to magnetize the magnetic core 5 becomes smaller. As a result, the magnetic core 5 is less likely to be magnetically saturated, and heat generation of the magnetic core 5 can be suppressed.

It is conceivable to provide the magnetic core 5 in the main bodies 410, 420, 430, but in this case, the drive current is generated on the upstream side (feeding terminal 413, 423, 433 side) from the position where the magnetic core 5 is provided. If a part of the current is branched and supplied to the winding 32, the total value of the drive currents of the portion covered with the magnetic core 5 may not be zero, and the above-mentioned effects may not be sufficiently obtained. .. Therefore, the magnetic material so as to collectively cover each wiring portion 41 to 43 on the power supply terminal 413, 423, 433 side from the position where the drive current branches to the winding 32 (here, the connection portion 411, 421, 431). It is desirable to provide the core 5. That is, among the plurality of connection portions 411,421,431, each wiring portion 41 to 43 between the connection portion 411,421,431 closest to the power supply terminal 413,423,433 and the power supply terminal 413,423,433. It is desirable to provide the magnetic core 5 so as to cover all of them.

Further, by providing the magnetic core 5 so as to cover each wiring portion 41 to 43, the inductor composed of the magnetic core 5 and the central conductor 400a acts as a low-pass filter for blocking high-frequency current, so that high-frequency noise It is also possible to reduce the electromagnetic noise radiated from the power supply paths connected to the wiring units 41 to 43 and the wiring units 41 to 43.

In the present embodiment, the magnetic core 5 is made of a nanocrystalline soft magnetic material. The nanocrystal soft magnetic material is a material in which nanocrystal grains of a ferromagnetic phase are dispersed in the remaining amorphous phase by crystallizing an amorphous alloy.

Here, Finemet (registered trademark) was used as the nanocrystal soft magnetic material. The magnetic core 5 made of Finemet (registered trademark) is made of, for example, a molten alloy containing Fe (-Si) -B as a basic component and a trace amount of Cu and elements such as Nb, Ta, Mo, and Zr added thereto. An amorphous metal strip with a thickness of about 20 μm is once formed by an ultra-quenching method such as a roll method, and this is formed into a magnetic core shape (here, an annular shape that collectively covers each wiring portion 41 to 43), and then at a crystallization temperature or higher. It is formed by heat treatment and crystallization. The crystal grain size of the magnetic core 5 is about 10 nm. As the magnetic core 5, a nanocrystal soft magnetic material other than Finemet (registered trademark), for example, NANOMET (registered trademark) may be used.

The nanocrystal soft magnetic material has a high saturation magnetic flux density and excellent soft magnetic characteristics (high magnetic permeability and low magnetic core loss characteristics) as compared with the conventionally used soft magnetic materials such as soft ferrite. Therefore, by using the nanocrystal soft magnetic material as the magnetic core 5, the magnetic core 5 can be miniaturized. As a result, it is possible to suppress the increase in size and mass of the electric motor wiring member 4, and to keep the entire electric motor wiring member 4 compact and lightweight even when the magnetic core 5 is attached. The size (thickness and length) of the magnetic core 5 may be appropriately set so as to obtain desired characteristics in consideration of the characteristics of the nanocrystal soft magnetic material to be used.

Further, the nanocrystal soft magnetic material also has a characteristic that electromagnetic noise in the frequency band used for radios such as AM radio can be suppressed as compared with the soft magnetic materials such as soft ferrite used conventionally. Since road information and the like are provided by an AM radio in a vehicle, it can be said that the effect of suppressing electromagnetic wave noise in the frequency band used for the radio is particularly large when the wiring member 4 for an electric motor is applied to the vehicle.

However, the nanocrystal soft magnetic material has a characteristic that the magnetic characteristics are easily changed when stress is applied from the outside. Therefore, when a magnetic core 5 made of a nanocrystalline soft magnetic material is used, it is necessary to configure the magnetic core 5 so that no external stress is applied to the magnetic core 5.

In the present embodiment, the wiring member 4 for the electric motor collectively covers the U-phase wiring unit 41, the V-phase wiring unit 42, and the W-phase wiring unit 43, and the U-phase wiring unit 41, the V-phase wiring unit 42, and W. A holding portion 6 made of an insulating resin that holds and fixes the phase wiring portion 43 to each other is provided, and the magnetic core 5 is provided in the holding portion 6. As the insulating resin used for the holding portion 6, it is desirable to use a resin that is not easily deformed by an external force. For example, engineering plastics such as PPS (polyphenylene sulfide), PA (polyamide), and PBT (polybutylene terephthalate) are used. be able to.

In the present embodiment, the holding portion 6 includes an inner holding portion 61a having an oval cross section for collectively holding the plurality of wiring portions 41, 42, 43, and an outer wall portion 61b covering the inner holding portion 61a. A main body portion (holding main body portion) 61 in which an accommodating groove 63 for accommodating the magnetic core 5 is formed between the inner holding portion 61a and the outer wall portion 61b, and an accommodating groove 63 in the main body portion 61. It has a lid portion 62 provided so as to close the opening of the. The magnetic core 5 is housed in a storage groove 63 in the main body 61 of the holding part 6.

The thickness of the inner holding portion 61a is preferably 1.0 mm or more as a configuration for suppressing external stress from being applied to the magnetic core 5. Here, the thickness of the inner holding portion 61a means the distance from the outer peripheral surface of the wiring portions 41 to 43 to the outer peripheral surface of the inner holding portion 61a. Further, the thickness of the outer wall portion 61b is preferably 1.0 mm or more.

From the viewpoint of further suppressing the application of external stress to the magnetic core 5, the main body 61 is preferably harder than the magnetic core 5. Specifically, it is preferable that the inner holding portion 61a and the outer wall portion 61b are harder than the magnetic core 5. Here, "the inner holding portion 61a is harder than the magnetic core 5" means that the magnetic core 5 having the same length as the inner holding portion 61a when both ends of the inner holding portion 61a are gripped and bent. It means that it is harder to bend than when both ends are gripped and bent. Further, "the outer wall portion 61b is harder than the magnetic core 5" means that when both ends of the thinnest portion of the outer wall portion 61b are gripped and bent, the magnetic core having the same length as that portion is obtained. It means that it is harder to bend than when both ends of 5 are gripped and bent.

By having such a structure in the main body 61, it is possible to further reduce the application of stress to the magnetic core 5 due to the vibration of the vehicle, the vibration of the electric motor 1, or the like. As a result, even if a nanocrystalline soft magnetic material whose magnetic properties are likely to change when stress is applied is used as the magnetic core 5, it is possible to further suppress the change in magnetic properties.

The main body 61 of the holding portion 6 covers the feeding portions 421, 422, 432 of the wiring portions 41 to 43 (ends (tip portions) of the rising portions 421b, 422b, 432b on the feeding terminals 413, 423, 433 side. The resin is molded (so as to cover the portion excluding)), and is integrally provided in each wiring portion 41 to 43. In the present embodiment, the main body 61 of the holding portion 6 is formed integrally with the three main body holding portions 7 provided directly below the main body 61. The main body 61 has a role of holding and fixing each of the wiring portions 41 to 43 and the magnetic core 5 to each other, and covers the periphery of the magnetic core 5 to protect the magnetic core 5 and protects the magnetic core 5. It also serves to suppress the deterioration of magnetic properties.

The accommodating groove 63 is for accommodating the magnetic core 5. The accommodating groove 63 is formed so as to open on the upper surface of the main body 61 on the side of the power supply terminal 413, 423, 433 so as to open on the side of the power supply terminal 413, 423, 433.

The lid portion 62 plays a role of suppressing the magnetic core 5 accommodated in the accommodating groove 63 from falling off and protecting the magnetic core 5. The lid portion 62 is formed in a plate shape, and the lid portion 62 is formed with a through hole 621 for inserting the tip portions of the rising portions 421b, 422b, and 432b. The lid portion 62 is attached to the upper surface of the main body portion 61 while inserting the tip portions of the rising portions 421b, 422b, and 432b of the wiring portions 41 to 43 into the through holes 621. The means for fixing the lid 62 to the main body 61 is not particularly limited. For example, the lid 62 may be adhesively fixed to the main body 61 using an adhesive, or a locking mechanism using a lance or the like. The lid portion 62 may be fixed to the main body portion 61 accordingly.

In the present embodiment, after the magnetic core 5 is accommodated in the accommodating groove 63 of the main body 61, the lid 62 is attached to the main body 61, and then the power supply terminal 413 is attached to the tip of the rising portions 421b, 422b, 432b. , 423, 433 are fixed by crimping or the like, respectively. In this way, the holding portion 6 has a role of holding each of the wiring portions 41 to 43 and the magnetic core 5 to maintain a relative positional relationship, and protects the magnetic core 5 and exerts an external force on the magnetic core 5. It also serves to suppress changes in magnetic characteristics due to addition.

It is also possible to provide the magnetic core 5 integrally with the holding portion 6 by insert molding. However, in this case, the magnetic characteristics of the magnetic core 5 may deteriorate due to the resin pressure when the holding portion 6 is molded. Therefore, in order to suppress deterioration of the magnetic properties of the magnetic core 5, it is more desirable to accommodate the magnetic core 5 in the accommodating groove 63 of the main body 61 formed in advance by molding or the like.

(Actions and effects of embodiments)
As described above, the wiring member 4 for the electric motor according to the present embodiment includes an annular magnetic core 5 that collectively covers the U-phase wiring portion 41, the V-phase wiring portion 42, and the W-phase wiring portion 43. ing.

By providing the magnetic core 5 so as to cover each wiring portion 41 to 43, the surge voltage applied to the winding 32 is suppressed, a discharge is generated in the winding 32, and the durability of the winding 32 deteriorates. It becomes possible to suppress that. Further, since the total value of the drive currents of the U phase, the V phase, and the W phase becomes zero, the magnetic core 5 can be provided by providing the magnetic core 5 so as to collectively cover the wiring portions 41 to 43. It becomes difficult to be magnetically saturated, and it becomes possible to suppress heat generation of the magnetic material. As a result, the magnetic core 5 can be miniaturized, and the entire wiring member 4 for the electric motor can be made compact.

As described above, according to the present embodiment, unlike the conventional method, the electric discharge due to the surge voltage is performed without using an expensive insulating material for the winding 32 or increasing the thickness of the insulating material. It is possible to realize a wiring member 4 for an electric motor, which can suppress the generation, and can suppress the cost of the winding 32 and the increase in size of the winding 32 while suppressing the generation of discharge due to the surge voltage.

Further, in the present embodiment, the magnetic core 5 is made of a nanocrystalline soft magnetic material. By using the magnetic core 5 made of a nanocrystal soft magnetic material, the magnetic core 5 can be made smaller and lighter than the conventionally used ferrite core or the like, and the magnetic core 5 is provided. Even in this case, the entire wiring member 4 for the electric motor can be maintained small and lightweight. In the present embodiment, "the magnetic material core 5 is provided so as to collectively cover each wiring portion 41 to 43" and "the magnetic material core 5 is made of a nanocrystalline soft magnetic material", so that a synergistic effect is obtained. As a result, the magnetic core 5 can be made smaller and lighter, and a compact wiring member 4 for an electric motor that can be easily mounted on a vehicle, which is an object to be mounted, can be realized.

(Summary of embodiments)
Next, the technical idea grasped from the above-described embodiment will be described with reference to the reference numerals and the like in the embodiment. However, the respective symbols and the like in the following description are not limited to the members and the like in which the components in the claims are specifically shown in the embodiment.

[1] The U-phase winding (32U) to which the U-phase, V-phase, and W-phase drive currents having different phases by 120 ° are supplied and the U-phase drive current is supplied, and the V-phase drive current A wiring member (4) for an electric motor provided in an electric motor (1) having a V-phase winding (32V) to be supplied and a W-phase winding (32W) to which the driving current of the W phase is supplied. The U-phase power supply terminal (413) for connecting the U-phase power supply path for supplying the U-phase drive current as well as being electrically connected to the U-phase winding (32U) is provided. The U-phase wiring section (41) that supplies the U-phase drive current from the U-phase power supply path to the U-phase winding (32U) is electrically connected to the V-phase winding (32V). The V-phase feeding terminal (423) for connecting the V-phase feeding path for supplying the V-phase driving current is provided, and the V-phase driving current from the V-phase feeding path is transferred to the V-phase winding ( The V-phase wiring unit (42) supplied to 32V) is electrically connected to the W-phase winding (32W), and the W-phase power supply path for supplying the W-phase drive current is connected. A W-phase wiring unit (43) having a W-phase power supply terminal (433) and supplying the W-phase drive current from the W-phase power supply path to the W-phase winding (32W), and the U-phase wiring unit. An electric current wiring member (4) including an annular magnetic core (5) that collectively covers (41), the V-phase wiring portion (42), and the W-phase wiring portion (43).

[2] The wiring member (4) for an electric motor according to [1], wherein the magnetic core (5) is made of a nanocrystalline soft magnetic material.

[3] The U-phase wiring unit (41), the V-phase wiring unit (42), and the W-phase wiring unit (43) are collectively covered, and the U-phase wiring unit (41) and the V-phase wiring unit are covered. It has a holding portion (6) made of a resin that holds the (42) and the W-phase wiring portion (43), and the magnetic core (5) is provided in the holding portion (6). The wiring member (4) for an electric motor according to 1] or [2].

[4] The holding portion (6) is an inner holding portion (61a) that collectively holds the U-phase wiring portion (41), the V-phase wiring portion (42), and the W-phase wiring portion (43). ), An outer wall portion (61b) that covers the inner holding portion (61a), and the magnetic core (5) between the inner holding portion (61a) and the outer wall portion (61b). The wiring member (4) for an electric motor according to [3], which has a holding main body portion (61) in which an accommodating groove (63) is formed for accommodating the above.

[5] The wiring member (4) for an electric motor according to [4], wherein the inner holding portion (61a) and the outer wall portion (61b) are harder than the magnetic core (5).

[6] The wiring member for an electric motor according to [4] or [5], which has a lid portion (62) provided in the holding main body portion (61) so as to close the opening of the accommodation groove (63). 4).

[7] The U-phase wiring portion (41), the V-phase wiring portion (42), and the W-phase wiring portion (43) are an annularly formed main body portion (410, 420, 430) and the main body. A plurality of connection portions (411,421) provided in the portions (410, 420, 430) and connected to the U-phase winding (32U), the V-phase winding (32V), or the W-phase winding (32W). , 431), the wiring member for an electric motor (4) according to any one of [1] to [6], which comprises a bus ring having the above.

[8] An electric motor (1) provided with the wiring member (4) for the electric motor according to any one of [1] to [7].

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all 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 case where each wiring portion 41 to 43 of the electric motor wiring member 4 is a bus ring has been described, but each wiring portion 41 to 43 may not be formed in an annular shape, for example, winding. It may be a power line connecting one end of the line 32 and the terminal block. Further, the feeding terminals 413, 423, 433 for connecting the feeding path may be directly provided at the end of the winding 32. In this case, the end of the winding 32 wound around the core 31 is pulled out, and the feeding terminals 413, 423 and 433 are provided at the end of the pulled out winding 32. The core 31 A part of the winding 32 drawn from the wiring portion 41 to 43 constitutes the wiring portion 41 to 43.

1 ... Motor 2 ... Rotor 3 ... Stator 31 ... Core 32 ... Winding 32U ... U-phase winding 32V ... V-phase winding 32W ... W-phase winding 4 ... Motor wiring member 41 ... U-phase wiring section 42 ... V-phase Wiring unit 43 ... W-phase wiring unit 413 ... U-phase power supply terminal 423 ... V-phase power supply terminal 433 ... W-phase power supply terminal 5 ... Magnetic core 6 ... Holding unit 7 ... Main body holding unit

Claims (8)

Rotor and, U-phase phase difference by 120 °, V-phase, and the drive current of the W phase is supplied, U-phase winding, each drive current of the U-phase is provided on the outer periphery of the rotor is supplied , V-phase winding driving current of the V phase is supplied, and a wiring member for a motor provided in the electric motor having a W-phase winding drive current is supplied, the said W-phase,
The U is electrically connected to the U-phase winding and has a U-phase feeding terminal for connecting a U-phase feeding path for supplying the U-phase drive current, and the U from the U-phase feeding path. A U-phase wiring unit that supplies a phase drive current to the U-phase winding,
It is electrically connected to the V-phase winding and has a V-phase feeding terminal for connecting a V-phase feeding path for supplying the driving current of the V-phase, and the V from the V-phase feeding path. A V-phase wiring unit that supplies a phase drive current to the V-phase winding
The W phase feeding terminal is electrically connected to the W phase winding and has a W phase feeding terminal for connecting a W phase feeding path for supplying the W phase driving current, and the W from the W phase feeding path. A W-phase wiring unit that supplies a phase drive current to the W-phase winding,
With
The U-phase wiring unit includes a U-phase connection unit connected to the U-phase winding, a U-phase power supply unit that rises in the rotation axis direction of the rotor and is provided with the U-phase power supply terminal, and a rotation axis direction of the rotor. It integrally has a U-phase main body portion that extends in a direction intersecting with the U-phase connecting portion and connects the U-phase feeding portion.
The V-phase wiring unit includes a V-phase connection unit connected to the V-phase winding, a V-phase power supply unit that rises in the rotation axis direction of the rotor and is provided with the V-phase power supply terminal, and a rotation axis direction of the rotor. It integrally has a V-phase main body portion that extends in a direction intersecting with the V-phase connecting portion and connects the V-phase feeding portion.
The W-phase wiring unit includes a W-phase connection unit connected to the W-phase winding, a W-phase power supply unit that rises in the rotation axis direction of the rotor and is provided with the W-phase power supply terminal, and a rotation axis direction of the rotor. A W-phase main body portion that extends in a direction intersecting with the W-phase connecting portion and connects the W-phase feeding portion and the W-phase feeding portion is integrally provided.
The U-phase feeding unit, the V-phase feeding unit, and the W-phase feeding unit are collectively covered, and between the U-phase main body and the U-phase feeding terminal, the V-phase main body and the V-phase feeding terminal are provided. A wiring member for an electric motor provided with an annular magnetic core provided between the W-phase main body and the W-phase power supply terminal . The magnetic core is made of nanocrystalline soft magnetic material.
The wiring member for an electric motor according to claim 1. A holding unit made of resin that collectively covers the U-phase wiring unit, the V-phase wiring unit, and the W-phase wiring unit, and holds the U-phase wiring unit, the V-phase wiring unit, and the W-phase wiring unit. Have,
The magnetic core is provided on the holding portion.
The wiring member for an electric motor according to claim 1 or 2. The holding portion has an inner holding portion that collectively holds the U-phase wiring portion, the V-phase wiring portion, and the W-phase wiring portion, and an outer wall portion that covers the inner holding portion. It has a holding main body portion in which an accommodating groove for accommodating the magnetic core is formed between the inner holding portion and the outer wall portion.
The wiring member for an electric motor according to claim 3. The inner holding portion and the outer wall portion are harder than the magnetic core.
The wiring member for an electric motor according to claim 4. The holding main body has a lid provided so as to close the opening of the accommodating groove.
The wiring member for an electric motor according to claim 4 or 5. The U-phase wiring portion, the V-phase wiring portion, and the W-phase wiring portion are each formed by plastically deforming an insulated wire having a central conductor made of a single-core metal and an insulator covering the central conductor. And
The U-phase main body, the V-phase main body, and the W-phase main body have a portion in which they are aligned in the rotation axis direction of the rotor.
The wiring member for an electric motor according to any one of claims 1 to 6. The wiring member for an electric motor according to any one of claims 1 to 7 is provided.
Electric motor.

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