JP2009065800A - Middle point joining structure of stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a work required for joining middle points of a plurality of coils of a stator, and to suppress a cost increase required for joining the middle points. <P>SOLUTION: A middle point joining member 14 connecting two or more phases of stator coils is provided with a conductive tabular member 71, and N coil connection terminals 72, ..., 72 connecting N (for example, N=3 corresponding to three phases) stator coils corresponding to the number of phases and the tabular member 71. The tabular member 71 is provided with N flat parts 71a, ..., 71a, and (N-1) bending parts 71b, ..., 71b. The tabular member 71 is provided with an offset part 71c offsetting toward the outside in the axial direction, at the position around the connecting part of insulating bobbins 32, 32 adjoining to each other in the circumferential direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a midpoint connection structure of a stator.

Conventionally, for example, a stator including a midpoint terminal that connects a plurality of stator coils wound via an insulating bobbin for each of a plurality of divided iron cores constituting the stator is known (see, for example, Patent Document 1).
JP 2005-312207 A

By the way, the middle point terminal of the stator according to the prior art includes a connecting portion where fusing (heat caulking) is performed for each stator coil, and two stators adjacent to each other on one side and the other side in the circumferential direction for each stator coil. A position shifted from the other end of the lead wire of the center stator coil and the other end of the lead wire of one stator coil are sandwiched and connected to the coil by the connecting portion of the center stator coil, Each stator coil is sandwiched and connected by the connecting portion of the other stator coil so that the position shifted from the other end of the lead wire of the other stator coil and the other end of the lead wire of the center stator coil. Two stator coils adjacent to each other on both sides in the circumferential direction are connected. However, in this midpoint terminal, there is a problem in that it takes troublesome work to perform fusing by attaching two lead wires to the connection portion for each stator coil.
For such a problem, for example, by providing a bus ring for connecting the other end of the lead wire of each stator coil, it is possible to reduce the troublesome work required for the connection work. However, in this case, there arises a problem that the cost required for molding the bus ring and insulating coating over the entire circumference of the bus ring is increased.
The present invention has been made in view of the above circumstances, and it is possible to simplify the work required for connecting the middle points of a plurality of coils of the stator, and to suppress an increase in the cost required for connecting the middle points. It is an object to provide a midpoint connection structure.

  In order to solve the above-described problems and achieve the object, the midpoint connection structure of the stator according to the first aspect of the present invention includes a plurality of teeth (in the radial direction) at a predetermined interval in the circumferential direction of the stator yoke ( For example, the teeth 31a in the embodiment and a coil (for example, the stator coil in the embodiment) wound around each of the plurality of teeth via an insulating member (for example, the insulating bobbin 32 in the embodiment) 34) including a midpoint coupling member (for example, the midpoint coupling member 14 in the embodiment) for connecting the coils of a plurality of phases. The point connecting member is an offset portion (for example, the embodiment) that is offset outward in the axial direction at a position around the connection portion (for example, the connection portion 32A in the embodiment) between the insulating members adjacent in the circumferential direction. Comprises an offset portion 71c).

  Furthermore, in the midpoint connection structure of the stator according to the second aspect of the present invention, the insulating member is an extended wall portion (for example, an embodiment) that expands in the radial direction at a connection portion between the insulating members adjacent in the circumferential direction. And an expansion chamber (for example, the expansion chamber 54 in the embodiment) that can be filled with an insulating resin material.

  Furthermore, in the midpoint coupling structure of the stator according to the third aspect of the present invention, the midpoint coupling member is a connection terminal (for example, a coil connection terminal 72 in the embodiment) connected to a lead wire drawn out from the coil. ), And the connection terminal is disposed at a position shifted from the circumferential center position of the coil wound through the insulating member for each tooth to one of the circumferential directions.

  Furthermore, in the midpoint coupling structure of the stator according to the fourth aspect of the present invention, the midpoint coupling member connects the same number of coils as the number of phases of the plurality of phases.

  Furthermore, in the midpoint connection structure of the stator according to the fifth aspect of the present invention, the insulating member includes a mounting groove portion (for example, the groove portion 50a in the embodiment) to which the midpoint connection member can be attached.

  Furthermore, in the midpoint coupling structure of the stator according to the sixth aspect of the present invention, the midpoint coupling member that connects the n coils with an arbitrary natural number n is (n−1) bent portions (for example, It consists of the rod-shaped member (For example, plate-shaped member 71 in embodiment) which has the bending part 71b) in embodiment.

  According to the midpoint coupling structure of the stator according to the first aspect of the present invention, since the midpoint coupling member includes the offset portion that is offset outward in the axial direction, the conductive member that exists in the axially inward direction (for example, , Insulation of the rotor yoke, etc.) can be improved.

  Further, according to the midpoint coupling structure of the stator according to the second aspect of the present invention, the insulating member includes an expansion chamber that expands in the radial direction at the connection portion, and the expansion chamber can be filled with an insulating resin material. Therefore, it is possible to prevent a short-circuit path from being formed in the radial direction and to secure desired insulation.

  Furthermore, according to the midpoint connection structure of the stator according to the third aspect of the present invention, for example, even when the coil is configured by a rectangular wire having a substantially rectangular cross section, excessive twisting and bending are formed. The lead wire of the coil can be attached to the connection terminal while suppressing and preventing the insulating layer on the coil surface from being damaged.

  Further, according to the midpoint coupling structure of the stator according to the fourth aspect of the present invention, the number of coils equal to the number of phases of the plurality of phases is compared with the case where all of the plurality of coils are connected by a single member, for example. By configuring the midpoint coupling member with each member to be connected, the total amount of material required for the configuration of the midpoint coupling member can be reduced, and the cost required for molding and insulation of the midpoint coupling member increases. This can be prevented.

  Furthermore, according to the middle point coupling structure of the stator according to the fifth aspect of the present invention, by providing the insulating member with the mounting groove portion on which the middle point coupling member can be mounted, the desired insulation with respect to the middle point coupling member can be easily achieved. Can be secured.

  Furthermore, according to the midpoint connection structure of the stator according to the sixth aspect of the present invention, it is possible to prevent the shape of the midpoint connection portion from becoming complicated, and the cost required for molding and insulation of the midpoint connection member increases. Can be prevented.

Embodiments of a stator midpoint connection structure of the present invention will be described below with reference to the accompanying drawings.
The stator 2 according to this embodiment is provided in a motor 1 mounted on a vehicle such as a hybrid vehicle or an electric vehicle as a travel drive source, for example.

For example, as shown in FIG. 1, the motor 1 is an inner rotor type brushless motor in which a rotor 3 is disposed on the inner peripheral side of an annular stator 2.
The stator 2 includes, for example, as shown in FIGS. 1 to 3, a stator holder 11, an annular stator group 12 formed of a plurality of stator pieces 12 a,. And a point connecting member 14.

The stator holder 11 includes a cylindrical portion 21 and a flange portion 22 provided so as to project outward in the radial direction at one end portion of the cylindrical portion 21 in the rotation axis O direction.
In the stator holder 11, for example, a cylindrical portion 21 is accommodated in a housing (not shown), and a bolt (not shown) inserted through a bolt mounting hole (not shown) provided in the flange portion 22 is screwed into the housing. Fixed by.
The annular stator group 12 is accommodated in the cylindrical portion 21 of the stator holder 11 by press fitting or the like.

The annular stator group 12 is configured by arranging a predetermined number of stator pieces 12a, ..., 12a in an annular shape.
Each stator piece 12a includes, for example, a split iron core 31 formed by laminating a plurality of substantially T-shaped silicon steel plates in the direction of the rotation axis O, and an insulating bobbin 32 made of an insulating resin material attached to the split iron core 31. And a stator coil 34 wound around the insulating bobbin 32.

The split iron core 31 includes a tooth 31a and a yoke 31b having the same thickness in the direction of the rotation axis O, and the circumferential width of the yoke 31b provided integrally with the radial base end of the tooth 31a It is formed to be larger than the circumferential width of 31a.
Further, both end surfaces in the circumferential direction of the yoke 31b are shaped so that they can come into surface contact with each other, and the yokes 31b, 31b adjacent in the circumferential direction face each other in a state where the plurality of stator pieces 12a,. In contact with each other, an annular stator group 12 is formed.
Accordingly, the teeth 31a are arranged so as to extend in the radial direction at positions at predetermined intervals in the circumferential direction of the stator yoke including the plurality of yokes 31b, ..., 31b.

  The insulating bobbin 32 extends from the bobbin portion 32a to the yoke 31b side of the split iron core 31 on one side in the stacking direction of the split iron core 31 and rotates the yoke 31b. A power collection / distribution wall 32b in contact with the end face in the axis O direction, and a midpoint connection wall 32c extending in a direction away from the yoke 31b on one side in the stacking direction equivalent to the power collection / distribution wall 32b. I have.

The bobbin portion 32a includes flange portions 41a and 41b at both ends in the radial direction, and a stator coil 34 is wound between the flange portions 41a and 41b.
Then, both end surfaces in the circumferential direction of the power collecting / distributing wall portion 32b, the midpoint connecting wall portion 32c, and the flange portions 41a, 41b are formed to be in surface contact with each other, and the plurality of stator pieces 12a,. The insulating bobbins 32 adjacent to each other in the circumferential direction are in surface contact with each other.

Further, the power collection / distribution wall portion 32b is separated from the split iron core 31 from the outer peripheral side plate portion 42 disposed along the other end surface of the yoke 31b in the rotation axis O direction and the radial front end portion of the outer peripheral side plate portion 42. Two outer peripheral top plates 43, 43 that are bent in the direction (that is, one side in the direction of the rotation axis O) are provided.
The space surrounded by the outer peripheral side plate portion 42, the outer peripheral side top plate portions 43 and 43, and the flange portion 41a is a power collection and distribution space in which the power collection and distribution member 13 is accommodated.
The flange portion 41a forming the power collection and distribution space is provided with an outer circumferential cutout groove 46 extending in the direction of the rotation axis O, and one end of the stator coil 34 wound around the bobbin portion 32a is inserted. It has come to be.

Further, the midpoint connecting wall portion 32c includes an inner peripheral side plate portion 47 that extends radially inward from the flange portion 41b on the other side in the rotation axis O direction, and a radial front end portion of the inner peripheral side plate portion 47. To the inner peripheral side top plate 48 at a position closer to the inner peripheral side top plate 48 than the flange 41b. Bracket 49.
The space surrounded by the inner peripheral side plate portion 47, the inner peripheral side top plate portion 48, and the flange portion 41b is a midpoint connection space 50 in which the midpoint connection member 14 is accommodated.

The flange portion 41b that forms the midpoint connection space 50 is shifted from the circumferential center position of the stator coil 34 wound around the bobbin portion 32a to one circumferential direction on one side in the rotation axis O direction. An inner peripheral cutout groove 51 extending in the direction of the rotation axis O at a position, and a guide portion 52 for introducing the stator coil 34 mounted in the inner peripheral cutout groove 51 toward the other circumferential direction into the bobbin portion 32a. Is formed.
In other words, the stator coil 34 mounted in the inner circumferential notch groove 51 starts to be wound around the bobbin portion 32a (in other words, the direction toward the one side of the substantially circumferential direction and the bobbin portion 32a). In the direction in which the lead wire of the stator coil 34 that is wound around extends is shifted from the center position in the circumferential direction of the bobbin portion 32a and the stator coil 34 starts to be wound around the bobbin portion 32a (that is, the bobbin An inner circumferential notch groove 51 is provided at a position away from the lead wire drawing position of the stator coil 34 wound around the portion 32a. Then, the stator coil 34 inserted into the inner circumferential notch groove 51 is mounted toward the other side in the substantially circumferential direction along the guide portion 52 to be introduced into the bobbin portion 32a and wound around the bobbin portion 32a. It ’s getting started.

  Further, the inner peripheral side top plate portion 48 that forms the midpoint connection space 50 is expanded radially inward at both end portions in the circumferential direction, that is, the connection portions 32A between the insulating bobbins 32 and 32 adjacent in the circumferential direction. An expansion chamber 54 that can be filled with an insulating resin material is formed by the expansion portions 53 and 53 adjacent to each other in the circumferential direction.

  The current collecting and distributing member 13 includes annular bus rings 61U, 61V, 61W for connecting a plurality of stator coils 34,..., 34 for each of a plurality of phases (for example, three phases of U phase, V phase, and W phase). The bus rings 61U, 61V, 61W for each of the plurality of phases have substantially the same shape, and an annular lead frame 62, a power supply terminal 63 provided on the lead frame 62, and a plurality of stator coils , 34 and the lead frame 62 are connected to a plurality of connection terminals 64,..., 64, and the lead frame 62 and the plurality of connection terminals 64,. ,..., 65 are provided.

The resin mold portion 65 has a shape that can be accommodated in the power collection and distribution space of the insulating bobbin 32, and in particular has a circumferential width that can be fitted between the outer peripheral side top plate portions 43, 43 of the insulating bobbin 32. Thus, the circumferential position of each of the bus rings 61U, 61V, 61W is positioned and fixed at a predetermined position in a state where the resin mold portion 65 is mounted between the outer peripheral side top plate portions 43, 43, and the coil connection of the connection terminal 64 is performed. The portion 64 a is set so as to face the outer circumferential cutout groove 46 of the insulating bobbin 32 in the radial direction. Then, one end portion of the stator coil 34 that is inserted into the outer peripheral cutout groove 46 and goes outward in the radial direction is attached to the coil connection portion 64a of the connection terminal 64, and is connected by fusing (heat caulking). The
Thereby, the stator coils 44 of the stator pieces 12a of the phases corresponding to the bus rings 61U, 61V, 61W of the respective phases are connected, and one end portions of the stator coils 34 of the stator pieces 12a of the U phase are connected to the bus ring 61U. And one end of the stator coil 34 of each V-phase stator piece 12a is connected via a bus ring 61V, and one end of the stator coil 34 of each W-phase stator piece 12a is connected to each other. Are connected via a bus ring 61W.

  As shown in FIGS. 2 to 6, for example, the midpoint connecting member 14 includes the conductive plate-like member 71 and the same number N as the number of phases of a plurality of phases (for example, N = 3 corresponding to three phases). ) Stator coils 34,..., 34 and the plate-like member 71, and a plurality of N (for example, N = 3 corresponding to three phases) coil connection terminals 72,. Has been.

  The plate-like member 71 is sandwiched from both sides in the radial direction by the inner peripheral side top plate portion 48 and the bracket 49 of each insulating bobbin 32 in the midpoint connection space 50, so that the inner peripheral side top plate portion 48 and the bracket 49 and the inner peripheral side plate portion 47 are mounted in a groove portion 50a, and N flat portions 71a,..., 71a corresponding to each of N (for example, N = 3) stator coils 34,. And (N−1) bent portions 71b,..., 71b, and the circumferential end of the inner peripheral side top plate portion 48 forming the midpoint coupling space 50, that is, the insulation adjacent in the circumferential direction. Each of the bent portions 71b is set to be disposed at a position around the connecting portion 32A between the bobbins 32 and 32. Each flat portion 71a is connected to a coil connection terminal 72 that protrudes radially outward (that is, toward the stator coil 34).

  The distal end portion of the coil connection terminal 72 is curved in a substantially U shape, and the distal end portion is set so as to face the inner circumferential notch groove 51 of the insulating bobbin 32 in the radial direction. The other end of the stator coil 34 that is inserted into the inner circumferential cutout groove 51 and goes radially inward is attached to the tip of the coil connection terminal 72 and is connected by fusing (heat caulking). The

  Accordingly, the plurality of stator coils 34,..., 34 is a set of N (for example, N = 3 corresponding to three phases) stator coils 34,. The other ends of the stator coils 34,..., 34 of all phases are connected to each other via the midpoint connecting member 14 for each set.

  Further, the plate-like member 71 is positioned at the periphery of the inner peripheral side top plate portion 48 forming the midpoint connection space 50, that is, the position around the connection portion 32 </ b> A between the insulating bobbins 32 and 32 adjacent in the circumferential direction. Are provided with an offset portion 71c that is offset outward in the direction of the rotation axis O.

  As described above, according to the midpoint coupling structure of the stator 2 according to this embodiment, the plate-like member 71 of the midpoint coupling member 14 includes the offset portion 71c that is offset outward in the rotation axis O direction. Since the portion 71c is arranged at a position around the connecting portion 32A between the insulating bobbins 32 and 32, for example, the electrical insulation is relatively lowered around the connecting portion 32A between the insulating bobbins 32 and 32. In addition, for example, a desired electrical insulation can be ensured with respect to a conductive member (for example, a yoke of the rotor 3) existing inward in the rotation axis O direction.

  Further, in the connection portion 32A between the insulating bobbins 32 and 32, the inner peripheral side top plate portion 48 is provided with an extension portion 53 that extends radially inward, and the extension portions 53 and 53 that are adjacent in the circumferential direction allow Since the expansion chamber 54 that can be filled with an insulating resin material is formed, for example, a short circuit path is prevented from being formed in the radial direction with respect to, for example, a conductive member (for example, the yoke of the rotor 3). Desired electrical insulation can be ensured.

  Further, the inner peripheral side cutout groove 51 and the coil connection terminal 72 diametrically opposed to the inner peripheral cutout groove 51 have the stator coil 34 mounted in the inner peripheral cutout groove 51 wound around the bobbin portion 32a. The circumference of the bobbin portion 32a is opposite to the winding direction when starting to be performed (that is, the direction toward one side of the substantially circumferential direction in which the lead wire of the stator coil 34 wound around the bobbin portion 32a extends). Since the stator coil 34 is formed by a rectangular wire having a substantially rectangular cross section, for example, the bobbin portion 32a, the inner peripheral notch groove 51, and the coil connection are arranged because the stator coil 34 is configured by a rectangular wire having a substantially rectangular cross section. In the lead wire to the terminal 72, excessive twisting or bending is suppressed, and the insulating layer provided on the surface of the stator coil 34 is prevented from being damaged. Door can be.

  Further, the plurality of stator coils 34,..., 34 is a set of N (for example, N = 3 corresponding to three phases) stator coils 34,. Since the stator coils 34,..., 34 are divided into a plurality of sets, and all phases of the stator coils 34,..., 34 are connected via the midpoint connecting member 14, for example, all of the plurality of stator coils 34,. Compared with the case where the two are connected by a single member, the total amount of material required for the configuration of the midpoint coupling member 14 can be reduced, and the cost required for molding, insulation, etc. of the midpoint coupling member 14 increases. This can be prevented.

Further, the plate-like member 71 of the midpoint connecting member 14 is mounted on a groove formed by the inner peripheral side top plate portion 48 and the bracket 49 and the inner peripheral side plate portion 47 of the insulating bobbin 32, so that desired electrical Insulation can be easily ensured.
Further, the plate-like member 71 of the midpoint connecting member 14 includes N flat portions 71a corresponding to each of N (for example, N = 3 corresponding to three phases) stator coils 34,. ,..., 71a and (N-1) bent portions 71b,..., 71b prevent the shape of the midpoint connecting member 14 from becoming complicated. It is possible to prevent the cost required for molding and insulation from increasing.

It is a top view of the motor which concerns on embodiment of this invention. It is an AA arrow directional view shown in FIG. It is a BB arrow directional view shown in FIG. It is a principal part enlarged plan view of the stator which concerns on embodiment of this invention. It is a principal part perspective view of the midpoint connection member and insulation bobbin which concern on embodiment of this invention. It is a principal part perspective view of the midpoint connection member and insulation bobbin which concern on embodiment of this invention.

Explanation of symbols

1 Motor 2 Stator 14 Midpoint connecting member 31a Teeth 32 Insulating bobbin (insulating member)
32A Connection 34 Stator coil (coil)
50a Groove (mounting groove)
53 Extension part (expansion wall part)
54 Expansion chamber 71 Plate member (rod member)
71a Bent part 71c Offset part 72 Coil connection terminal (connection terminal)

Claims (6)

Middle-point coupling structure of a plurality of stators including a plurality of teeth extending in the radial direction at predetermined intervals in the circumferential direction of the stator yoke and a coil wound around each of the plurality of teeth via an insulating member Because
Comprising a midpoint connecting member for connecting the coils of a plurality of phases;
The intermediate point connection structure of the stator, wherein the intermediate point connection member includes an offset portion that is offset outward in the axial direction at a position around a connection portion between the insulating members adjacent in the circumferential direction. The said insulating member is formed by the expansion wall part extended in radial direction in the connection part of the said insulating members adjacent in the circumferential direction, and is provided with the expansion chamber which can be filled with an insulating resin material inside. Item 2. A midpoint connection structure of a stator according to Item 1. The midpoint coupling member includes a connection terminal connected to a lead wire drawn from the coil,
The said connection terminal is arrange | positioned in the position which shifted | deviated to either one of the circumferential direction from the circumferential center position of the said coil wound through the said insulating member for every said tooth. Alternatively, the stator midpoint connection structure according to claim 2. The stator midpoint coupling structure according to any one of claims 1 to 3, wherein the midpoint coupling member connects the same number of coils as the number of phases of the plurality of phases. The stator midpoint connection structure according to any one of claims 1 to 4, wherein the insulating member includes a mounting groove portion on which the midpoint connection member can be mounted. 6. The midpoint connecting member for connecting the n coils with an arbitrary natural number n is a rod-shaped member having (n−1) bent portions. The center point connection structure of the stator as described in one.

Images