JP7156420B2 - Coil connecting member - Google Patents

Description

The present invention relates to a coil connection member.

Conventionally, a multi-phase annular bus ring is provided as a member that connects the ends of multi-phase coil windings wound around a plurality of magnetic cores to collect and distribute current to the multi-phase coil windings. A connection member that does this is known (see Patent Document 1, for example).

The connection member described in Patent Document 1 includes a plurality of annular bus rings corresponding to respective phases of a multi-phase coil winding. Each bus ring is formed of a round wire-shaped conductive member in which a central conductor made of highly conductive metal is covered with an insulator made of resin. A plurality of connection portions connected to the coil windings are formed by bending the round wire-shaped conductive member.

Each connecting portion includes a pair of extending portions that extend radially inward and sandwich one end of the coil winding of each phase, and a curved portion that is formed between the pair of extending portions. have as one. One end of the coil winding for each phase is inserted between the pair of extensions, and the one end is thermally crimped to the pair of extensions so that it is attached to the surface of the connecting portion. The applied plating melts, and the connecting portion and one end of the coil winding of each phase are electrically connected.

JP 2015-047072 A

By the way, when the electric motor provided with the connection member configured as described above is used as, for example, a driving source of a vehicle, high vibration resistance is required. For this reason, it is desirable that the coil winding and the connection portion of the connection member are joined over a large area in order to secure connection strength.

However, as in the configuration described in Patent Document 1, the end of the coil winding has a rectangular wire shape, and the portion of the connecting portion that is joined to this end has a round wire shape. In this case, there are restrictions on increasing the bonding area between the coil winding and the bonding member.

In this respect, in the case where the end portion of the coil winding has a rectangular wire shape, it is conceivable to use a connection member having a rectangular wire shape in order to increase the bonding area. However, rectangular wire-shaped connection members are more difficult to process than round wire-shaped connection members, and the bending direction is limited. In addition, rectangular wire-shaped members are more expensive than round wire-shaped members, and there is a risk that the cost will increase.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coil connection member capable of increasing connection strength.

An object of the present invention is to solve the above problems by providing a coil connecting member for electrically connecting ends of a plurality of coil windings wound around an annular magnetic core, the coil connecting member comprising a linear conductor A conductor made of metal and an insulating film made of an insulator covering a surface of the conductor, the conductor having a plurality of connection portions connected to respective ends of the plurality of coil windings. and an intermediate portion between the plurality of connection portions, wherein the connection portion has a flat connection surface with the end portion of the coil winding formed by press working , and the intermediate portion includes , the coil winding has a round wire shape and is bent at at least one point, the insulating coating covers at least a part of the intermediate portion, and the end portion of the coil winding extends from the magnetic core side. The connection surface of the connection portion extends in the extending direction of the end portion of the coil winding, and the connection surface and the side surface of the coil winding are welded or heated. To provide a coil connecting member that is joined by tightening or soldering .

According to the coil connection member of the present invention, it is possible to increase the connection strength.

FIG. 2 is a schematic diagram illustrating a configuration example of a stator of an electric motor and a wiring example of a coil connecting member according to an embodiment of the present invention in the configuration example; (a) is a schematic diagram showing an electrical connection state of the magnetic cores constituting the stator shown in FIG. 1, and (b) is a schematic diagram of the electrical connection realized in (a) It is a circuit diagram showing. FIG. 2 is a perspective view showing one of the first magnetic cores in the electric motor shown in FIG. 1 alone; BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structural example of the coil connection member which concerns on one embodiment of this invention, (a) is a front view, (b) is a perspective view, (c) is a side view which shows an enlarged end part. . It is the schematic which shows the one end part of the coil connection member which concerns on the modification of this invention, (a) is a top view, (b) is a perspective view. FIG. 11 is a front view showing a schematic configuration of a coil connecting member according to a modified example of the present invention; FIG. 10 is a schematic diagram showing a configuration example of a coil connection member according to a modified example of the present invention; FIG. 11 is a circuit diagram schematically showing electrical connections realized in another stator configuration using a coil connection member according to a modified example of the present invention;

[Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

(Configuration of electric motor 1)
FIG. 1 is a schematic diagram illustrating a configuration example of a stator of an electric motor using a coil connection member according to an embodiment of the present invention and an arrangement example of the coil connection member according to the embodiment of the present invention in the configuration example. It is a diagram. FIG. 2(a) is a schematic diagram showing the electrical connection state of the magnetic cores constituting the stator, and FIG. 2(b) is a schematic diagram of the electrical connection realized in FIG. 2(a). It is a schematic circuit diagram. FIG. 3 is a perspective view showing alone a first magnetic core that constitutes the stator of FIG. 4A and 4B are diagrams showing a configuration example of a coil connection member according to an embodiment of the present invention, where (a) is a front view, (b) is a perspective view, and (c) is an enlarged view of one end. It is a side view.

(Configuration of electric motor 1)
As shown in FIGS. 1 and 2A, an electric motor 1 includes a rotor 2 and a stator 3 having a magnetic core 30 composed of a plurality of magnetic core pieces 31 forming a stator. ing.

The rotor 2 includes a shaft 21 coaxially and rotatably supported by a bearing (not shown) with the stator 3, and a shaft 21 fixed to the outer peripheral surface of the shaft 21 so that N poles and S poles are alternately magnetized along the circumferential direction. and a cylindrical magnet 22 .

The stator 3 has a plurality of magnetic core pieces 31 arranged in an annular shape and coil windings 32 wound around the respective magnetic core pieces 31 .

In the present embodiment, 18 magnetic core pieces 31 are annularly arranged around the rotation axis O1 of the shaft 21 shown in FIG. These 18 magnetic core pieces 31 consist of 15 first magnetic core pieces 31 (hereinafter simply referred to as "magnetic core pieces 31") and three second magnetic core pieces 31A. consists of In the magnetic core piece 31, one end 321 and the other end 322 of the coil winding 32, which will be described later, are both pulled out radially outward of the stator 3, whereas the second magnetic body The core piece 31A is different in that the other end 322A is pulled out radially inward of the stator 3 . Details will be described later. Although the magnetic core 30 is composed of a plurality of magnetic core pieces 31 in the present embodiment, the magnetic core may be composed of one annular magnetic body.

The fifteen magnetic core pieces 31 are composed of five U-phase magnetic core pieces 31U, five V-phase magnetic core pieces 31V, and five W-phase magnetic core pieces 31W. The three second magnetic core pieces 31A are composed of one U-phase second magnetic core piece 31AU, one V-phase second magnetic core piece 31AV, and one W-phase It is composed of a phase second magnetic core piece 31AW. In the following description, for the sake of convenience, the magnetic core pieces 31U, 31V, and 31W to which the power supply terminals 410, 420, and 430, which will be described later, are connected are referred to as the first magnetic core pieces 31U, 31V, and 31W. ) are assigned in the order of 2nd, 3rd, 4th and 5th along the rotation direction R of the rotor 2 shown in FIG.

Along the rotational direction R of the rotor 2 shown in FIG. Next to the magnetic core piece 31V, the first W-phase magnetic core piece 31W is arranged in order, and thereafter, the fifth magnetic core pieces 31U, 31V, Up to 31W are arranged. Further, next to the fifth W-phase magnetic core piece 31W, there is a U-phase second magnetic core piece 31AU, and next to this U-phase second magnetic core piece 31AU, there is a V-phase second magnetic core piece 31AU. A magnetic core piece 31AV is arranged next to the V-phase second magnetic core piece 31AV, and a W-phase second magnetic core piece 31AW is arranged. In this embodiment, a plurality (18 pieces) of magnetic core pieces 31 are arranged in a ring. It is also possible to use other toroids.

Details of the magnetic core piece 31 will be described with reference to FIG. Since the U-phase, V-phase, and W-phase magnetic core pieces 31U, 31V, and 31W have the same configuration, the U-phase magnetic core piece 31U will be described below as a representative example.

As shown in FIG. 3, the magnetic core pieces 31U are configured by laminating a plurality of electromagnetic steel plates 310, and are formed in order from the inner peripheral side of the stator 3 toward the outer peripheral side. a second wall portion 332, an inner flange portion 334 extending from the first wall portion 331 toward the inner peripheral side of the stator 3 and perpendicular to the axial direction of the stator 3; The insulator 33 is provided with an insulator 33 that protrudes toward the outer periphery of the stator 3 and integrally includes an outer flange portion 335 perpendicular to the axial direction of the stator 3 . A U-phase coil winding 32U is wound around the magnetic core pieces 31U between the first wall portion 331 and the second wall portion 332 in the radial direction of the stator 3 . One end 321U and the other end 322U of both ends of the coil winding 32U extend radially outward of the stator 3 through insertion holes 332a formed in the second wall portion 332. It is pulled out and extends in the direction of the rotation axis O1 of the electric motor 1 .

Similarly, the V-phase magnetic core piece 31V has a V-phase coil winding 32V as the coil winding 32, and the W-phase magnetic core piece 31W has a W-phase coil winding as the coil winding 32. 32W are wound respectively, and both ends of each coil winding 32V, 32W, that is, one end 321V, 321W and the other end 322V, 322W are pulled out radially outward of the stator 3. there is

In the magnetic core piece 31, as shown in FIG. 1, a U-phase power supply terminal 410 is electrically connected to one end 321U of both ends of the first U-phase coil winding 32U. there is Similarly, one end 321V of the first V-phase coil winding 32V is connected to the V-phase power supply terminal 420, and one end 321W of the first W-phase coil winding 32W is connected to the W The feed terminals 430 of the phases are electrically connected to each other.

The coil winding 32 is supplied with a sinusoidal drive current with a phase shift of 120 degrees from an inverter (not shown) via these power supply terminals 410 , 420 and 430 . A rotating magnetic field is formed in the stator 3 by this drive current, and the magnet 22 receives a rotating force due to the attractive force and repulsive force of this rotating magnetic field, and rotates the shaft 21 about its rotation axis O1.

In the second magnetic core piece 31A, a U-phase coil winding 32AU is wound as the coil winding 32 around the U-phase second magnetic core piece 31AU. A V-phase coil winding 32AV is wound as the coil winding 32 around the V-phase second magnetic core piece 31AV. A W-phase coil winding 32AW is wound as the coil winding 32 around the W-phase second magnetic core piece 31AW. Unlike the magnetic core pieces 31, in the second magnetic core pieces 31A, one ends 321AU, 321AV, 321AW of the respective coil windings 32AU, 32AV, 32AW are pulled out radially outward of the stator 3. On the other hand, the other end portions 322AU, 322AV, 322AW are pulled out radially inward of the stator 3 .

(Description of Coil Connection Member 5)
The coil connection member 5 includes an end portion of the coil winding 32 wound around at least one magnetic core piece 31 and another magnetic core piece 31 different from the at least one magnetic core piece 31. It is a member that electrically connects the ends of the coil windings 32 that are connected to each other.

As shown in FIG. 4(a), the coil connection member 5 includes a conductor 51 made of a linear conductive metal and an insulation coating 52 made of an insulator covering the surface of the conductor.

The conductor 51 integrally has a plurality of connection portions 511 connected to the coil winding 32 and an intermediate portion 512 between the plurality of connection portions 511 . Specifically, the conductor 51 has two connection portions 511 at both ends thereof.

The connection portion 511 has a flat connection surface 511a that is electrically connected to the coil winding 32 by, for example, press working. Both ends 321 and 322 of the coil winding 32 have a rectangular wire shape (see FIG. 3), and the connection surfaces 511a of the both ends 321 and 322 are located in the circumferential direction B (see FIG. 1) of the electric motor 1. reference) side (for example, see number 322Ua in FIG. 3). Specifically, the coil connection member 5 is arranged such that the connection surface 511a of the connection portion 511 extends in the extending direction of the both ends 321 and 322 of the coil winding 32, that is, in the direction of the rotation axis O1 of the electric motor 1. , the connection surface 511a and the side surface of the coil winding 32 are joined by TIG (Tungsten Inert Gas) welding, laser welding, thermal crimping, or soldering.

The intermediate portion 512 has a round wire shape and is bent at at least one location. In the present embodiment, intermediate portion 512 is bent at two locations on both ends thereof. Specifically, the intermediate portion 512 includes a body portion 513 having a linear shape in a front view shown in FIG. A straight portion 517 that is continuous on the opposite side of the main body portion 513 and has a straight shape, and a continuous portion 516 that is disposed between the straight portion 517 and the connection portion 511 and continues to the straight portion 517 and the connection portion 511 at both ends. and are integrated. The continuous portion 516 is configured such that the cross-sectional shape continuously changes from the connecting portion 511 side toward the bending portion 515 side so as to smoothly connect the connecting portion 511 and the bending portion 515 . Note that the continuous portion 516 and the linear portion 517 do not necessarily have to be provided, and can be provided arbitrarily.

In the present embodiment, the bent portion 515 is bent at an angle of approximately 90 degrees in the front view shown in FIG. 4(a). That is, the bent portion 515 is bent such that a straight portion 517 continuous to one end thereof extends in a direction orthogonal to the main body portion 513 continuous to the other end. With such a configuration, when the coil connection member 5 is arranged in the electric motor 1 so that the connection surface 511 a extends in the extending direction of the both end portions 321 and 322 of the coil winding 32 , the body portion of the intermediate portion 512 513 can be arranged so as to be positioned at the same height in the axial direction of the electric motor 1 .

Further, as shown in FIG. 4B, at least a portion of the intermediate portion 512, that is, the main body portion 513 is curved in an arc shape having a predetermined curvature in the side view shown in FIG. 4B. It has the shape of a mold. Specifically, the entire body portion 513 of the intermediate portion 512 is curved so as to follow the arrangement of the magnetic core pieces 31 when the coil connection member 5 is arranged in the electric motor 1 . More specifically, one connection portion 511 of the main body portion 513 can be connected to one end portion 321 of the coil winding 32 of the magnetic core piece 31 arranged in an annular shape, and the other connection portion 511 can be connected to , the other end 322 of the coil winding 32 of another magnetic core piece 31 is curved along the outer peripheral edge of the electric motor 1 .

In the present embodiment, the length of the intermediate portion 512 is determined by the length of the other end 322 of the predetermined magnetic core piece 31 and the rotation direction of the rotor 2 in the arrangement of the magnetic core pieces 31 shown in FIG. One end of the coil winding 32 of the in-phase magnetic core piece 31 arranged immediately next along R, that is, the magnetic core piece 31 three adjacent to the predetermined magnetic core piece 31 The length is adjusted so that it can be connected to the portion 321 . The curvature rate and length of the curve of the intermediate portion 512 are not limited to these, and are appropriately adjusted according to the positions of the magnetic core pieces 31 to be connected.

Moreover, the insulating coating 52 covers at least a portion of the intermediate portion 512 . Specifically, as shown in FIGS. 4A and 4C, of the intermediate portion 512, the body portion 513, the bent portion 515, and part of the straight portion 517 are covered with the insulating coating 52. It is

Further, as shown in FIG. 4(c), the connection surface 511a extends from the outer surface of the insulating coating 52 covering the intermediate portion 512 in the vicinity of the connection portion 511 when the coil connection member 5 is arranged in the electric motor 1. are also located on the ends 321 and 322 of the coil winding 32 . Specifically, both of the two connection surfaces 511a are located closer to the ends 321 and 322 of the coil winding 32 than the outer surface 52a of the insulating coating 52 covering part of the straight portion 517 of the intermediate portion 512. there is For example, the distance d between the connecting surface 511a and the outer surface 52a can be 1 mm or more. Although the coil winding 32 is not shown in FIG. 4(c), the coil winding 32 is assumed to exist on the left side of the connection surface 511a. In addition, in the present embodiment, the two connection portions 511 present at both ends of the coil connection member 5 are both configured as described above. The unit 511 may have the configuration as described above.

Also, the width of the connecting surface 511a is equal to or greater than the diameter of the intermediate portion 512. As shown in FIG. Here, the width of the connecting surface 511a is the length of the connecting surface 511a in the direction perpendicular to the direction of the central axis O2 of the intermediate portion 512. As shown in FIG.

(Regarding wiring of the coil connection member 5)
In the magnetic core piece 31, one end portion 321U and the other end portion 322U of the second to fifth U-phase coil windings 32U are provided with the coil connection members 5 according to the above-described embodiment of the present invention. electrically connected. Similarly, one end 321V and the other end 322V of the second to fifth V-phase coil windings 32V and one end 321W and the other end of the second to fifth W-phase coil windings 32W The coil connecting members 5 are electrically connected to the ends 322W. In the second magnetic core piece 31A, one end 321AU of the U-phase coil winding 32AU, one end 321AV of the V-phase coil winding 32AV, and one end of the W-phase coil winding 32AW Coil connecting members 5 are electrically connected to the ends 321AW.

Specifically, as shown in FIGS. 1 and 2A, the coil connection member 5 connects the other end portion 322U of the coil winding 32U of the first U-phase magnetic core piece 31U and the second end portion 322U of the coil winding 32U. One end 321U of the coil winding 32U of the U-phase magnetic core piece 31U is electrically connected. Similarly, the other end 322U of the coil winding 32U of the second U-phase magnetic core piece 31U and the one end 321U of the coil winding 32U of the third U-phase magnetic core piece 31U However, the other end 322U of the coil winding 32U of the third U-phase magnetic core piece 31U and the one end 321U of the coil winding 32U of the fourth U-phase magnetic core piece 31U , the other end 322U of the coil winding 32U of the fourth U-phase magnetic core piece 31U and the one end 321U of the coil winding 32U of the fifth U-phase magnetic core piece 31U, The other end 322U of the coil winding 32U of the fifth U-phase magnetic core piece 31U and the one end 321AU of the coil winding 32AU of the second U-phase magnetic core piece 31AU electrically connected. Similar connections are made for the V-phase and W-phase.

1 and 2A, the other end 322AU of the U-phase coil winding 32AU, the other end 322AV of the V-phase coil winding 32AV, and the W-phase coil winding The other end 322AW of the wire 32AW is electrically connected by the neutral phase coil connecting member 5A. Hereinafter, such a connection state is referred to as star connection.

As shown in FIG. 2(b), the coil connection member 5 is connected to one end portion 321 of the predetermined coil winding 32 and the in-phase coil winding arranged immediately next to it along the rotation direction R of the rotor 2. By connecting to the other end 322 of 32, the coil windings 32 of each phase can be electrically connected in series.

(Modification 1)
FIG. 5 is a schematic diagram showing one end of a coil connection member according to a modified example of the present invention, where (a) is a plan view and (b) is a perspective view. For reference, FIG. 5A shows one end 321 as an example of the end of the coil winding electrically connected to the connecting portion 511 . In the above embodiment, the insulating coating 52 covers the bent portion 515. However, as shown in FIGS. 5A and 5B, the bent portion 515 is exposed from the insulating coating 52. It can also be configured as Moreover, unlike the above embodiment, the continuous portion 516 and the linear portion 517 are not provided, and the bent portion 515 is directly connected to the connection portion 511 . Furthermore, the bent portion 515 can be configured such that a side surface 515b extending from a boundary portion 515a continuous with the connection portion 511 to a predetermined range on the main body portion 513 side is a flat surface. In other words, the side surface of the portion of the bent portion 515 extending along the extending direction of the connection portion 511, that is, the connection surface in the width direction of the connection surface 511a in plan view of FIG. The side surface of the portion included in the range where 511a is arranged can also be configured to be a flat surface that is continuous with the connection surface 511a.

(Modification 2)
Further, in the above-described embodiment, the body portion 513 of the intermediate portion 512 is configured to have an arc-curved shape, but as shown in FIG. 6, at least a portion of the intermediate portion 512B is formed in a polygonal shape. You can also make it look like Specifically, the intermediate portion 512B is bent at two predetermined positions. More specifically, the intermediate portion 512</b>B is formed in a polygonal shape so that it can follow the arrangement of the magnetic core pieces 31 when the coil connection member 5 is arranged in the electric motor 1 .

In other words, the intermediate portion 512B includes a linear first main body portion 513B, a linear second main body portion 513C continuous with one end of the main body portion 513B, and a linear main body portion 513C continuous with the other end of the main body portion 513B. and the third main body portion 513D are integrally provided. Further, the first main body portion 513B and the second main body portion 513C, and the first main body portion 513B and the third main body portion 513D are continuous so that the angles they form are predetermined angles θ1 and θ2. θ1 and θ2 can be arbitrarily adjusted. It can be adjusted so that one end 321 of the coil winding 32 of the adjacent magnetic core piece 31 can be connected. In addition, the number of main body parts constituting the intermediate part, the length of each main body part, the angle formed by one main body part and the other main body part, etc. can be adjusted as appropriate. In addition, a bent portion, a continuous portion, or a straight portion may be provided at the ends of the second main body portion 513C and the third main body portion 513D opposite to the first main body portion 513B so as to be continuous with the connecting portion 511. can.

(Modification 3)
In addition, in the above-described embodiment, the intermediate portion 512 is configured to be bent at two locations on both ends, but in addition to this, it may be configured to be further bent at locations other than both ends. can also Such a configuration can be used, for example, as the neutral phase coil connection member 5A. Specifically, as shown in FIG. 7 , the neutral phase coil connection member 5A is bent at two locations 515b of the main body portion 513 in addition to the two locations 515 at both end portions of the intermediate portion 512 . Also, a part of the region sandwiched between the two bent portions 515b of the body portion 513 is exposed from the insulating coating 52 to form another connecting portion 511B.

For reference, FIG. 7 shows the other ends 322AU, 322AV, 322AW of the coil winding 32A of the second magnetic core piece 31A shown in FIG. As shown in FIG. 7, in the neutral phase coil connection member 5A, the connection portions 511 at both ends are connected to the other ends 322AU and W of the coil winding 32AU of the second magnetic core piece 31AU of the U phase, respectively. It is electrically connected to the other end portion 322WU of the coil winding 32AW of the second magnetic core piece 31AW of the phase, and the central connection portion 511B is connected to the coil winding 32AV of the second magnetic core piece 31AV of the V phase. is electrically connected to the other end 322AV of the . As described above, using the neutral phase coil connection member 5A according to Modification 3, the other ends 322A of the coil windings 32A of the second magnetic core pieces 31A of the respective phases are electrically connected to each other. be done.

(Modification 4)
Further, the coil connection members 5 according to the above-described embodiment and modifications 1 to 3 are used for wiring forming a star connection as shown in FIGS. A serial connection of pieces 31 can also be used for other wiring. FIG. 8 shows another arrangement example. In this wiring example, three parallel connections and two series connections forming each parallel connection are formed in each phase. In such wiring for realizing the circuit shown in FIG. 8, the coil connection members 5 according to the above-described embodiment and modifications 1 to 3 are connected in series, that is, the magnetic core pieces 31 in phase are connected in series. can be used to connect

(Modification 5)
The coil connection members 5 and 5A according to the above-described embodiment and modified examples 1 to 4 are configured such that the coil windings 32 are each wound around one magnetic core piece 31 in the electric motor 1 (such a configuration). ), the coil winding 32 is wound over a plurality of magnetic core pieces 31 (in contrast to the above-described concentrated winding, such a configuration is referred to as “distributed winding”). ) can also be used.

(Actions and effects of the embodiment)
According to the embodiment and its modification described above, the following actions and effects are obtained. That is, the coil connection member 5 according to the present embodiment includes a conductor 51 made of a linear conductive metal, and an insulating coating 52 made of an insulator that covers the surface of the conductor 51. The conductor 51 is , a plurality of connection portions 511 connected to the coil windings 32 and an intermediate portion 512 between the plurality of connection portions 511 are integrally provided, and the connection portion 511 has a flat connection surface 511a with the coil windings. The intermediate portion 512 has a round wire shape and is bent at at least one location, and the insulating coating 52 covers at least a portion of the intermediate portion 512 .

By configuring in this way, the joint area between the connecting portion 511 having a flat connecting surface 511a and the ends 321 and 322 of the coil winding 32 having a rectangular shape is reduced to that of the circular connecting portion. can be larger than when using In addition, since the intermediate portion 512 has a round wire shape, it is easy to process such as bending. can be easily arranged along the extending direction of the coil winding 32, thereby further increasing the bonding area between the connecting portion 511 and the ends 321 and 322 of the coil winding 32. FIG. As a result, the connection surface 511a and the side surfaces of the ends 321 and 322 of the coil winding 32 can be joined over a wider area, and the connection strength can be increased.

In addition, since the intermediate portion 512 has a round wire shape and can be easily processed such as bending, it is possible to increase the degree of freedom in wiring the coil connection member 5 and to suppress an increase in material cost.

In addition, since the connection surface 511a is positioned closer to the ends 321 and 322 of the coil winding 32 than the outer surface 52a of the insulating coating 52 covering the linear portion 517, the connection surface 511a can be easily joined to the ends 321 and 322 of the .

Furthermore, since the width of the connection surface 511a is equal to or greater than the diameter of the intermediate portion 512 in the cross section of the intermediate portion 512 perpendicular to the central axis O2 direction, the connection surface 511a and the ends 321 and 322 of the coil winding 32 are joined together. Area can be made larger.

Furthermore, the intermediate portion 512 has a bent portion 515 exposed from the insulating coating 52 at the end thereof and is continuous with the connection portion 511, and at least a part of the side surface 515b of the bent portion 515 is flat and continuous with the connection surface 511a. With the planar configuration, the connection surface 511a can be formed even in a narrow space where the connection surface 511a cannot be positioned closer to the ends 321 and 322 of the coil winding 32 than the insulating coating 52 of the intermediate portion 512. and the ends 321 and 322 of the coil winding 32 can be joined. As a result, the degree of freedom in arranging the coil connecting member 5 can be further increased.

(Summary of embodiment)
Next, technical ideas understood from the embodiments described above will be described with reference to the reference numerals and the like in the embodiments. However, each reference numeral in the following description does not limit the constituent elements in the claims to the members and the like specifically shown in the embodiment.

[1] Coil connection for electrically connecting ends (321, 322) of a plurality of coil windings (32) wound around an annular magnetic core (30) that constitutes the stator of the electric motor (1) A member (5) comprising a conductor (51) made of a linear conductive metal and an insulating coating (52) made of an insulator covering the surface of the conductor (51), wherein the conductor (51) is a plurality of connection portions (511) connected respectively to the ends (321, 322) of the plurality of coil windings (32) and an intermediate portion between the plurality of connection portions (511) (512), and the connecting portion (511) has a flat connecting surface (511a) to the ends (321, 322) of the coil winding (32), and the intermediate The portion (512) has a round wire shape and is bent in at least one place, and the insulating coating (52) covers at least a part of the intermediate portion (512), the coil connection member (5 ).

[2] At least one connection portion (511) among the plurality of connection portions (511) has the connection surface (511a) covered with the intermediate portion (512) in the vicinity of the connection portion (511). The coil connecting member (5) according to [1], which is located closer to the ends (321, 322) of the coil winding (32) than the outer surface of the insulating coating (52).

[3] The coil connection member (5) according to [1] or [2], wherein the width of the connection surface (511a) is equal to or greater than the diameter of the intermediate portion (512).

[4] The intermediate portion (512) has a bent portion exposed from the insulating coating (52) at the end thereof and continues to the connecting portion (511), and at least part of the bent portion The coil connection member (5) according to any one of [1] to [3], wherein the side surface of the coil connection member (5) is a flat surface continuous with the connection surface (511a).

[5] Any one of [1] to [4], wherein at least part of the intermediate portion (512) is curved in an arc along the arrangement of the magnetic core (30) coil connection member (5) of.

[6] Any one of [1] to [4], wherein at least a portion of the intermediate portion (512) is formed in a polygonal shape along the arrangement of the magnetic core (30). coil connection member (5) of.

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

DESCRIPTION OF SYMBOLS 1... Electric motor 2... Rotor 3... Stator 3... Modification 5... Coil connection member 30... Magnetic core 32... Coil winding 51... Conductor 52... Insulating coating 321, 322... End 511... Connection part 511a... Connection surface 512...Intermediate portion O2...Center axis

Claims (6)

A coil connection member for electrically connecting ends of a plurality of coil windings wound around an annular magnetic core,
A conductor made of a linear conductive metal and an insulating coating made of an insulator covering the surface of the conductor,
The conductor integrally has a plurality of connection portions connected to the ends of the plurality of coil windings and an intermediate portion between the plurality of connection portions,
The connection portion has a flat connection surface with the end portion of the coil winding formed by press working , and the intermediate portion has a round wire shape and is bent at least at one point,
The insulating coating covers at least part of the intermediate portion,
an end portion of the coil winding extends from the magnetic core side, and the connection surface of the connecting portion extends in an extending direction of the end portion of the coil winding;
The connecting surface and the side surface of the coil winding are joined by welding, heat crimping, or soldering,
Coil connection member. At least one connecting portion among the plurality of connecting portions has the connecting surface positioned closer to the end portion of the coil winding than the outer surface of the insulating coating coated on the intermediate portion near the connecting portion. ing,
The coil connecting member according to claim 1. The width of the connecting surface is equal to or greater than the diameter of the intermediate portion,
The coil connecting member according to claim 1 or 2. The intermediate portion has a portion exposed from the insulating coating at an end thereof which is bent to be continuous with the connection portion, and at least a side surface of the bent portion is a flat surface continuous with the connection surface. be,
The coil connection member according to any one of claims 1 to 3. At least part of the intermediate portion is curved in an arc shape along the arrangement of the magnetic core,
The coil connection member according to any one of claims 1 to 4. At least part of the intermediate portion is formed in a polygonal shape along the arrangement of the magnetic cores,
The coil connection member according to any one of claims 1 to 4.

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