JP2013090404A - Electric motor - Google Patents

Electric motor Download PDF

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Publication number
JP2013090404A
JP2013090404A JP2011227761A JP2011227761A JP2013090404A JP 2013090404 A JP2013090404 A JP 2013090404A JP 2011227761 A JP2011227761 A JP 2011227761A JP 2011227761 A JP2011227761 A JP 2011227761A JP 2013090404 A JP2013090404 A JP 2013090404A
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JP
Japan
Prior art keywords
insulator
bus bar
coil
phase
rotor
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Pending
Application number
JP2011227761A
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Japanese (ja)
Inventor
Junichi Miyaki
淳一 宮木
Original Assignee
Jtekt Corp
株式会社ジェイテクト
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Publication date
Application filed by Jtekt Corp, 株式会社ジェイテクト filed Critical Jtekt Corp
Priority to JP2011227761A priority Critical patent/JP2013090404A/en
Publication of JP2013090404A publication Critical patent/JP2013090404A/en
Pending legal-status Critical Current

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Abstract

An electric motor capable of preventing a bus bar from being displaced from an insulator by an external force during resin molding of a stator is provided.
A coil is wound through a front insulator attached to a stator core. An annular portion 26 of the bus bar 17 having a hexagonal shape and having a notch 27 formed in a part thereof is integrally formed on the front-side insulator 13 along a linear groove portion 28 provided in the front-side insulator 13. It is inserted. Further, one bent portion of the annular portion 26 in the vicinity of the bus bar terminal 25 is in contact with the side corner portion of the front insulator 13.
[Selection] Figure 2

Description

  The present invention relates to an electric motor.
  The electric motor includes a rotating rotor and a stator fixed to the outside of the outer peripheral surface of the rotor. The stator is wound with a coil via an insulator attached to the stator core. For example, in the case of a three-phase electric motor, the U phase, the V phase, and the W phase are configured by three sets of opposed coils. A plate-like bus bar having a plurality of terminals for connecting to the end portions of the coils as means for connecting the lead wires connected to the connection wires (crossover wires) between the coils and facilitating the coil connection work. (For example, refer to Patent Document 1 or Patent Document 2).
  Some bus bars have a plurality of bus bar terminals each having a slit-like portion with one end opened in an annular portion (ring). And the edge part of the coil is engaged with each bus-bar terminal, and the engaging part is further resistance-welded by fusing.
Japanese Patent Laid-Open No. 6-233383 JP 2001-103700 A
  In the above-described electric motor, since the coil is wound through the insulator after the bus bar is fixed to the insulator attached to the stator core, the lead wire extraction position of the coil may be shifted due to manufacturing variations. In such a case, it is necessary to align the engaging portion in order to connect the end portion of the coil and each bus bar terminal arranged on the bus bar. In addition, it is necessary to secure a space between the end portion of the coil and the engagement portion of each bus bar terminal for fusing. For this reason, as an alternative method to the above, there is a case where a bus bar in which coils are connected to an insulator is integrally resin-molded. However, at this time, a molding pressure is applied to the bus bar in contact with the insulator, and there is a possibility that the position of the bus bar is shifted. This complicates the stator connection work and may cause contact between coils or disconnection.
  The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric motor capable of preventing a bus bar from being displaced from an insulator by an external force when a stator is molded.
  In order to solve the above-mentioned problem, the invention according to claim 1 is an insulator for insulating a stator core and a coil, and an annular bus bar fixed to the insulator and electrically connected to the coil of each phase. The bus bar has an annular portion formed in a polygonal shape, wherein the bus bar includes a plurality of bus bar terminals that engage end portions of the coils. The gist of the present invention is to be fitted and supported in a linear groove provided in the insulator, and to have a diameter larger than the shape formed by the groove.
  According to the above configuration, the bus bar shared by the coils of each phase in which a plurality of bus bar terminals are arranged is fitted in the insulator, and the end of the coil wound around the insulator attached to the stator core and each bus bar terminal are associated with each other. The joint part is connected by fusing. At this time, the annular part of the bus bar is formed in a polygonal shape and is formed slightly larger in the radial direction than the shape of the supporting groove, so that it can be easily fitted along the linear groove provided in the insulator, The bus bar is supported by pressing the insulator. Thereby, the connection operation | work of the stator of an electric motor can be performed easily.
  A second aspect of the present invention is the electric motor according to the first aspect, wherein the bus bar has a notch formed in a part of the annular portion.
  According to the above configuration, since a part of the annular portion of the bus bar is cut away, the bus bar can be easily fitted and fixed to the insulator. Further, since the annular portion of the bus bar presses the insulator with a spring force, it is possible to prevent the bus bar from being displaced from the insulator by an external force when the stator is resin-molded after the coil is formed.
  It is possible to provide an electric motor capable of preventing the bus bar from being displaced from the insulator by an external force when the stator is molded.
The axial direction sectional view showing the schematic structure of the electric oil pump device concerning the embodiment of the present invention. The end view which looked at the stator part of the electric motor which concerns on embodiment of this invention from the pump side. The figure which shows the shape of the bus-bar fitted by the insulator with which the stator part of FIG. 2 is mounted | worn. Sectional drawing of the insulator part (a bus bar and a coil are included) seen from the AA direction in FIG.
Next, an electric motor according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an axial sectional view showing a schematic configuration of an electric oil pump device according to an embodiment of the present invention. An electric motor (hereinafter referred to as a brushless motor) 2 according to the present embodiment is a three-phase brushless motor, and is used in an electric oil pump device 1 used as a hydraulic pump for an automobile transmission. Here, the brushless motor 2 is double star-connected, and the U, U ′ phase, V, V ′ phase, and W, W ′ phase are constituted by three sets of opposed coils. As shown in FIG. 1, the electric oil pump 1 includes an oil pump (for example, an internal gear pump) 3 that sucks and discharges oil, and the oil pump 3 and the brushless motor 2 are unitized.
  Here, the oil pump 3 uses a trochoidal curved pump, and an inner rotor for pump (hereinafter referred to as “outer rotor”) 9 having outer teeth on a pump outer rotor (hereinafter referred to as “outer rotor”) 9 having inner teeth having trochoidal teeth. (Hereinafter referred to as the inner rotor) 10 and the outer rotor 9 and the inner rotor 10 are eccentrically disposed in the pump housing 12 so as to be rotatable.
  The inner rotor 10 is externally fitted and fixed to a portion closer to one side (the left side in FIG. 1) than the portion where the rotor 5 is formed in the rotational drive shaft 6, and rotates together with the rotational drive shaft 6. The outer rotor 9 has one more internal tooth than the outer teeth of the inner rotor 10, and is disposed so as to be rotatable within the pump housing 12 around a position eccentric with respect to the rotational drive shaft 6. Further, the inner rotor 10 is configured such that the outer teeth mesh with the inner teeth of the outer rotor 9 at a part of the entire circumference, and the outer teeth rotate while being substantially inscribed on the inner surface of the outer rotor 9 at various locations on the entire circumference. ing.
  Therefore, when the rotational drive shaft 6 is rotationally driven by the brushless motor 2, the volume of the gap between the outer rotor 9 and the inner rotor 10 of the oil pump 3 repeatedly expands and contracts during one rotation of the rotational drive shaft 6. A pump operation is performed to feed oil from an import (not shown) leading to these gaps to the outport.
  As shown in FIG. 1, the brushless motor 2 includes a rotating motor rotor (hereinafter referred to as a rotor) 5, and a motor stator (hereinafter referred to as a stator) 4 fixed to the outside of the outer peripheral surface of the rotor 5. It consists of. The rotor 5 is formed by arranging, for example, a plurality of permanent magnets 7 along the circumferential direction on the outer peripheral surface of the rotary drive shaft 6. The rotation drive shaft 6 is a rotation shaft shared by the brushless motor 2 and the oil pump 3, and both ends thereof are rotatably supported by bearings 23 and 24 inside the motor housing 12.
  In the stator 4, a plurality of inward salient poles (hereinafter referred to as teeth) of the stator core 8 are arranged outside the outer peripheral surface of the rotor 5 through a slight air gap. In this embodiment, the number of teeth is six. A coil 18 is wound around each tooth of the stator core 8. Here, insulators for insulating the coil 18 from the stator core 8 are attached to both axial ends of the stator core 8. For convenience, the pump side of the stator 4 will be described as a front insulator 13 and the opposite side will be described as a rear insulator 19.
  The pump housing 12 and the motor housing 11 are made of a nonmagnetic material (for example, aluminum die casting). The front-side insulator 13 and the rear-side insulator 19 are formed of a resin material (for example, an insulator such as PPS). The housing body includes the pump housing 12, the front insulator 13, the motor housing 11, and a body case 20 described later.
  The front insulator 13 is integrally formed with a coil 18 wound around the stator core 8 and a hexagonal bus bar 17 having a bus bar terminal 25 (see FIG. 2) that electrically connects the coils 18 to each other. It is buried (molded). Here, the bus bar 17 is formed into a predetermined shape by applying a process such as bending a flat plate with a long metal plate (for example, copper or copper alloy). The bus bar is formed with a plurality of (for example, six) bus bar terminals 25 each having a slit-like portion whose one end is open. And the edge part of each coil 18 is engaged and this engaging part is further resistance-welded by the fusing process. Further, bolt holes 15 for inserting six bolts 14 are arranged in the front-side insulator 13 at equal intervals in the circumferential direction with respect to the center of the shaft (see FIG. 2).
  The rear insulator 19 attached to the stator core 8 is provided with a bus bar 29 (see FIG. 2) having bus bar terminals 30 for electrically connecting the coils 18 or between the coils 18 and a control board 21 described later. 6 nuts 16 made of metal (iron or copper, etc.) are embedded by insert molding. And the stator 4 of the brushless motor 2 is fixed by screwing the bolt 14 inserted from the pump housing 12 to the nut 16 embedded in the rear insulator 19.
  In the electric oil pump 1 according to the present embodiment, a control board 21 for controlling the brushless motor 2 is attached to an outer end surface of a resin-made (for example, PPS) main body case 20. The control board 21 converts this DC power into AC and supplies drive current to each coil 18 of the brushless motor 2 and this information based on the rotational position information of the outer rotor 9 detected by a sensor such as a Hall element. A control circuit for controlling the inverter circuit is mounted. The control board 21 is hermetically housed in a control board housing 22 made of metal (for example, aluminum die-casting) having good thermal conductivity, together with electronic components such as coils and capacitors (not shown) on the circuit board. A controller of the electric oil pump device 1 is configured. The control board 21 and the electronic components are hermetically housed in the control board housing 22 to ensure waterproofness to the controller.
  With the above configuration, the drive current controlled by the control board 21 is supplied to each coil 18 via the bus bar terminal of the rear insulator 19. Thereby, a rotating magnetic field is generated in the coil 18, torque is generated in the permanent magnet 7, and the rotor 4 is rotationally driven. When the inner rotor 10 is rotationally driven in this way, the outer rotor 9 is driven and rotated, and the gap between the inner teeth of the outer rotor 9 and the outer teeth of the inner rotor 10 is repeatedly expanded and contracted. Pump operation is performed to suck and discharge oil through the port.
  Next, FIG. 2 is an end view of the stator portion of the electric motor according to the embodiment of the present invention as seen from the pump side, and FIG. 3 shows the shape of the bus bar fitted into the insulator attached to the stator portion of FIG. FIG. 4 and FIG. 4 are cross-sectional views of an insulator portion (including a bus bar and a coil) viewed from the AA direction in FIG.
  As shown in FIGS. 2 to 4, the stator core 8 used in the stator 4 corresponds to a three-phase structure, and the six teeth are paired with teeth arranged opposite to each other in the circumferential direction. Thus, the U, U ′ phase, V, V ′ phase, and W, W ′ phase are configured. The insulator mounted on the stator core 8 is configured as a pair of assembled members including a front-side insulator 13 inserted from the pump side and a rear-side insulator 19 (see FIG. 1) inserted from the opposite side. Yes.
  A coil 18 is wound through a front-side insulator 13 and a rear-side insulator 19 attached to the stator core 8. An annular portion 26 of a bus bar 17 having a hexagonal shape is integrally fitted into the front side insulator 13 along a linear groove portion 28 provided in the front side insulator 13. At this time, a notch 27 is formed in a part of the annular portion 26. Further, one bent portion of the annular portion 26 in the vicinity of the bus bar terminal 25 is in contact with the side corner portion of the front insulator 13.
  Here, the bus bar 17 is a common connection member on the ground side of each phase of the U, U ′ phase, V, V ′ phase, and W, W ′ phase that electrically connects the coils 18 of each phase. Six bus bar terminals 25 each having a slit-like portion (opening) with one end open are integrally formed in a state of projecting in a radial direction from the outer periphery of the front-side insulator 13 by a predetermined distance. The bus bar terminal 25 is connected to one end of a coil 18 constituting the U, U ′ phase, V, V ′ phase, and W, W ′ phase, respectively. The side insulator 13 can be bent perpendicularly to the inner diameter side in the pump direction with respect to the peripheral end surface. At this time, the axial length of the bent bus bar terminal 25 is suppressed to be equal to or less than the axial length (height) of the front insulator 13.
  Hereinafter, a method for assembling the front side of the stator 4 will be described with reference to FIG. First, the front-side insulator 13, the rear-side insulator 19 (see FIG. 1), and the bus bars 17 and 29 are assembled in the stator core 8 into which the motor housing 11 is press-fitted. Next, a coil 18 (for example, a U phase) is formed by winding one magnet wire (copper wire) from one tooth to a tooth facing in the circumferential direction. The winding end portion of the wound coil 18 is sandwiched between the front end portions (slit-like portions) of the bus bar terminals 25 of the bus bar 17 fitted into the front insulator 13. Similarly, the winding start end portion of the coil 18 is sandwiched between the front end portions of the bus bar terminals 30 of the bus bar 29 fitted into the rear insulator 19.
  Subsequently, the winding end end portion of the coil 18 (for example, U ′ phase) wound in parallel in the same phase from the teeth opposite to the circumferential direction of the U phase is sandwiched between the front end portions of the bus bar terminals 25 of the front insulator 13. It is. Similarly, the winding start end portion of the coil 18 is sandwiched between the front end portions of the bus bar terminals 30 of the bus bar 29 fitted into the rear insulator 19. As with the U and U ′ phases, the coil 18 is wound around the V, V ′ phase, W, and W ′ phase, the winding end ends of the coils 18 are sandwiched between the end portions of the bus bar terminals 25, and resistance welding is performed by fusing. To do. Further, after the fusing process, the bus bar terminal 25 is bent 90 ° or more toward the inner diameter side in the pump direction, and the front side of the stator 4 is formed.
  Next, operations and effects of the brushless motor 2 according to the present embodiment configured as described above will be described.
  According to the above configuration, the coil 18 is wound via the front insulator 13 and the rear insulator 19 attached to the stator core 8, and the annular portion 26 having the hexagonal shape of the bus bar 17 is formed on the front insulator 13. It is integrally fitted along a linear groove 28 provided in the front insulator 13. Here, the bus bar 17 is a common connection member on the ground side of each phase of the U, U ′ phase, V, V ′ phase, and W, W ′ phase that electrically connects the coils 18 of each phase. A plurality of (for example, six) bus bar terminals 25 having slit-like portions with one ends open are integrally formed in a state of protruding in the radial direction. The bus bar 17 has a diameter of the annular portion 26 that is slightly larger than the diameter formed by the groove portion 28 of the front insulator 13 into which the annular portion 26 is fitted, and a notch 27 is formed in a part thereof.
  Thereby, since the annular portion 26 of the bus bar 17 is formed in a polygonal shape (for example, hexagonal), the bus bar 17 can be easily fitted along the linear groove portion 28 provided in the front insulator 13 and the bus bar 17. Is supported in a state where the front insulator 13 is pressed. As a result, the connection work of the brushless motor 2 is simplified. Since a part of the annular portion 26 of the bus bar 17 is cut away, the bus bar 17 can be easily assembled and fixed to the front insulator 13.
  Further, since the annular portion 26 of the bus bar 17 is pressed against the front insulator 13 by the spring force, the bus bar 17 is prevented from being displaced from the front insulator 13 due to molding pressure when resin molding is performed after the coil is formed. it can. In addition, since one bent portion of the annular portion 26 in the vicinity of the bus bar terminal 25 is in contact with and pressed against the side corner portion of the front insulator 13, it is possible to suppress the bus bar 17 from moving in the circumferential direction. Further, since the length of the bus bar terminal 25 after the end of the coil 18 is connected to the bus bar terminal 25 and bent in the axial direction is kept low, the axial length of the brushless motor 2 is prevented from becoming long. it can.
  As described above, according to the present embodiment, it is possible to provide an electric motor that can prevent the bus bar from being displaced from the insulator by an external force when the stator is resin-molded.
  Although one embodiment according to the present invention has been described above, the present invention can also be implemented in other forms.
In the above embodiment, the case where the rotor 5 of the brushless motor 2 is fixed by arranging and fixing a plurality of permanent magnets 7 on the outer peripheral portion of the rotary drive shaft 6 is used. It may be.
Moreover, in the said embodiment, although the case where the brushless motor 2 was applied to the electric oil pump apparatus 1 was shown, it is not limited to this, Even if applied to the other apparatus using the same brushless motor 2 Good.
Furthermore, although the case where the internal gear pump was used as the oil pump 3 was shown in the said embodiment, it is not limited to this, The rotary pump using a vane drive, an external gear, etc. may be sufficient.
1: electric oil pump device, 2: brushless motor (electric motor),
3: oil pump, 4: stator for motor, 5: rotor for motor, 6: rotary drive shaft,
7: permanent magnet, 8: stator core, 9: outer rotor for pump,
10: Inner rotor for pump, 11: Motor housing, 12: Pump housing,
13, 19: insulator, 14: bolt, 15: bolt hole, 16: nut,
17, 29: Bus bar, 18: Motor coil, 20: Main body case, 21: Control board,
22: Control board housing, 23, 24: Bearing, 25, 30: Bus bar terminal,
26: Busbar ring part, 27: Ring part notch, 28: Insulator groove part

Claims (2)

  1. An insulator that insulates the stator core from the coil;
    An annular bus bar fixed to the insulator and electrically connected to the coil of each phase;
    In the electric motor in which a plurality of bus bar terminals for engaging the end portions of the coils are formed on the bus bar,
    The bus bar has an annular portion formed in a polygonal shape, and the annular portion is fitted and supported in a linear groove provided in the insulator, and is formed with a larger diameter than the shape formed by the groove. An electric motor characterized by that.
  2. The electric motor according to claim 1,
    The electric motor according to claim 1, wherein the bus bar has a notch formed in a part of the annular portion.
JP2011227761A 2011-10-17 2011-10-17 Electric motor Pending JP2013090404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011227761A JP2013090404A (en) 2011-10-17 2011-10-17 Electric motor

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JP2011227761A JP2013090404A (en) 2011-10-17 2011-10-17 Electric motor

Publications (1)

Publication Number Publication Date
JP2013090404A true JP2013090404A (en) 2013-05-13

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JP2011227761A Pending JP2013090404A (en) 2011-10-17 2011-10-17 Electric motor

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6279122B1 (en) * 2017-04-04 2018-02-14 三菱電機株式会社 Rotating electric machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6279122B1 (en) * 2017-04-04 2018-02-14 三菱電機株式会社 Rotating electric machine

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