JP2013247698A - Electric motor - Google Patents

Electric motor Download PDF

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Publication number
JP2013247698A
JP2013247698A JP2012117447A JP2012117447A JP2013247698A JP 2013247698 A JP2013247698 A JP 2013247698A JP 2012117447 A JP2012117447 A JP 2012117447A JP 2012117447 A JP2012117447 A JP 2012117447A JP 2013247698 A JP2013247698 A JP 2013247698A
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JP
Japan
Prior art keywords
insulator
coil
winding
rotor
stator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2012117447A
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Japanese (ja)
Inventor
Naotake Kanda
尚武 神田
Akira Hiramitsu
明 平光
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 JP2012117447A priority Critical patent/JP2013247698A/en
Publication of JP2013247698A publication Critical patent/JP2013247698A/en
Pending legal-status Critical Current

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Abstract

To provide an electric motor that can be easily wound when a winding end of a coil is securely fixed to an insulator during winding of a stator coil.
Both end portions of a coil 17 wound around an insulator 21 mounted on each divided tooth 30 forming a stator core 9 are front end portions in an outer diameter direction of a rear side end surface of the insulator 21 in a rotation axis direction. Are fitted and fixed in two storage grooves 26 formed in a straight line. The one storage groove 26 a has a taper shape in the rotation axis direction, and is inclined so that the width becomes narrower toward the bottom of the storage groove 26 a in the rotation axis direction of the insulator 21. At this time, the winding of the coil 17a having a large wire diameter is sandwiched between the wide upper portions of the storage groove 26a, and the winding of the coil 17b having a small wire diameter is sandwiched between the lower portions of the storage grooves 26a having a narrow width. Is done.
[Selection] Figure 4

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. In the stator, a plurality of teeth portions extending in the radial direction of the stator core are arranged in the circumferential direction, and a coil is wound via an insulator attached to the teeth portions (see, for example, Patent Document 1). The insulator is for insulating the coil and the tooth portion. According to the technique of Patent Document 1, the insulator is formed such that concave portions (entangled grooves) extend along the radial direction on both sides in the circumferential direction of the distal end portion covering the axial end portion of the tooth portion. The start of winding is fixed to the recess.
JP 2004-140964 A
  However, in the electric motor described above, since the recesses are formed with the same width in the rotation axis direction, the coil winding cannot be fixed to the recesses due to variations in the outer diameter of the coil windings, and sufficient tension is applied to the windings. May not be obtained. Moreover, when changing the wire diameter of a coil with the shape of a stator core as it is, it is also necessary to change the width | variety of the recessed part of an insulator. At this time, it is necessary to prepare an insulator having a recess width corresponding to the wire diameter of each coil and wind the coil. For this reason, in order to fix a coil, the installation cost and manufacturing man-hour of a jig | tool are increased, As a result, a manufacturing cost may be increased.
  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to easily fix the winding end portion of the coil winding to the insulator at the time of coil winding of the stator so that the winding work can be easily performed. An object of the present invention is to provide an electric motor that can be used.
  In order to solve the above problems, the invention according to claim 1 is directed to a motor housing, a stator core in which a tooth portion is annularly arranged, an insulator that covers and insulates the tooth portion, and the tooth portion via the insulator. A stator wound around the coil and fixed in the motor housing, and a rotor arranged to be rotatable while facing the inner peripheral surface of the stator, and the insulator is arranged on the rear side in the rotation axis direction. A plurality of linear storage grooves into which the end portions of the coils extending in the radial direction are fitted at the distal end portion in the outer diameter direction of the end surface; and at least one of the storage grooves is the storage groove in the rotation axis direction of the insulator The gist of the present invention is that it is inclined so that its width becomes narrower toward the bottom.
  According to the above configuration, the winding end of the coil wound around the insulator attached to each tooth portion of the stator core is fitted into the linear storage groove extending in the radial direction at the outer peripheral end portion of the insulator. ing. The storage groove has a tapered shape whose width becomes narrower toward the bottom of the storage groove in the rotation axis direction of the insulator. Thereby, the winding end portion of the coil at the beginning of winding is fitted and fixed in the storage groove, and sufficient winding force can be secured to wind the coil winding in alignment with the insulator. As a result, the coil winding operation can be easily performed. Further, if the shape of the stator core is the same, it is not necessary to change the width of the storage groove of the insulator even when the wire diameters of the coils are different, and the insulator can be shared.
  ADVANTAGE OF THE INVENTION According to this invention, the coil end of the coil winding start can be reliably fixed to an insulator at the time of coil winding of a stator, and the electric motor which can perform winding work easily can be provided.
The longitudinal cross-sectional view which shows schematic structure of an electric oil pump apparatus. FIG. 3 is a step view showing a structure of a stator portion of the electric motor according to the embodiment of the present invention. The top view which shows the shape of the insulator with which the stator part of the electric motor which concerns on embodiment of this invention is mounted | worn. Sectional drawing of the insulator part seen from the AA direction in FIG.
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a schematic configuration of an electric oil pump device, and FIG. In the following description, the left side of FIG. 1 is the front and the right side is the rear. As shown in FIG. 1, an electric oil pump device 1 is used as a hydraulic pump for an automobile transmission, and an oil pump (for example, an internal gear pump) 2 and an electric motor (hereinafter referred to as a brushless motor) that drives the oil pump 2 to rotate. ) 3 are adjacent (unitized). The controller 4 is also incorporated in the motor housing 15. The brushless motor 3 shown in FIG. 1 is, for example, a sensorless brushless motor having a three-phase coil connected in a double star connection.
  The oil pump 2 uses a trochoid curved pump here, and an inner rotor for pumps (hereinafter referred to as “outer rotor”) 10 having outer teeth on the inner periphery of a pump outer rotor (hereinafter referred to as “outer rotor”) 10 having inner teeth having trochoidal teeth. (Hereinafter referred to as an inner rotor) 11, and a pump section (pump rotor) in which the outer rotor 10 and the inner rotor 11 are eccentrically disposed in a pump chamber 12 formed between the pump plate 14 and the pump housing 13 so as to be rotatable. Is configured.
  The inner rotor 11 is externally fitted and fixed to a portion (left side in FIG. 1) that is closer to the front than a portion where the motor rotor (hereinafter referred to as a rotor) 6 is formed on the rotational drive shaft 7, and rotates together with the rotational drive shaft 7. It has become. The outer rotor 10 has one more internal tooth than the outer teeth of the inner rotor 11, and is arranged so as to be rotatable in the pump chamber 12 around a position eccentric with respect to the rotation drive shaft 7. In addition, the inner rotor 11 rotates with its outer teeth meshing with the inner teeth of the outer rotor 10 at a part of its entire circumference, and each outer tooth substantially inscribed in the inner surface of the outer rotor 10 at various locations around the entire circumference. ing.
  Therefore, when the rotational drive shaft 7 is rotationally driven by the brushless motor 3, the volume of the gap between the outer rotor 10 and the inner rotor 11 of the oil pump 2 repeatedly expands and contracts during one rotation of the rotational drive shaft 7. A pump operation is performed to feed oil from an import (not shown) provided in the pump plate 14 leading to these gaps toward the outport.
  The brushless motor 3 includes a rotating rotor 6 and a motor stator (hereinafter referred to as a stator) 5 fixed to the outside of the outer peripheral surface of the rotor 6. The rotor 6 is formed by arranging, for example, a plurality of permanent magnets 8 along the circumferential direction on the outer peripheral surface of the rotary drive shaft 7. The rotation drive shaft 7 is a rotation shaft shared by the brushless motor 3 and the oil pump 2, and both ends thereof are supported by bearings (for example, rolling bearings) 28 and 29 disposed inside the pump housing 15 and the rotor holding member 22. It is pivotally supported.
  Referring to FIGS. 1 and 2, in the stator 5, a plurality of divided inward teeth 30 of the stator core 9 are arranged outside the outer peripheral surface of the rotor 6 through a slight air gap. A resin (for example, PPS) insulator 21 for insulating the coil 17 from the tooth 30 is attached to each tooth 30 of the stator core 9 from both ends in the axial direction, and a three-phase coil 17 is wound around each stator sub. Assy is formed. The stator 5 is composed of the plurality of stator subassemblies, and each stator subassembly is press-fitted into a cylindrical thin metal (for example, iron) collar 16 and fastened and fixed.
  The insulator 21 is molded integrally with the three bus bars 18 that are the drive terminals of the brushless motor 3. The ends of the coils 17 are electrically connected to the bus bars 18, and each bus bar 18 extends from the rear end of the insulator 21 in parallel to the rotation axis.
  The stator 5, the collar 16, the rotor holding member 22, and the bus bar 18 are molded integrally with the motor housing 15, and the motor housing 15 and the bus bar 18 are sealed with a seal member.
  In addition, a plurality of nuts (not shown) made of metal (for example, iron, copper, etc.) are arranged in the circumferential direction with respect to the rotation center and embedded by insert molding in the insulator 21 attached to each tooth 30 of the stator core 9. ing. The stator 5 of the brushless motor 3 is fixed by screwing a bolt (not shown) inserted from the pump plate 14 through the pump housing 13 to a nut embedded in the insulator 21.
  The pump plate 14 and the pump housing 13 constituting the housing of the oil pump 2 are made of a nonmagnetic material (for example, aluminum die casting). The motor housing 15 and the cover 27 that house the brushless motor 3 and the controller 4 are formed of a resin material (for example, a thermoplastic resin). The housing body of the electric oil pump device 1 includes the pump plate 14, the pump housing 13, the collar 16, the motor housing 15, and a cover 27. Here, the motor housing 15 and the cover 27 form a waterproof cover. The pump housing 15, the collar 16, and the holding member 22 are combined with each other in the rotation axis direction to fix the stator 5 and the rotor 6 of the brushless motor 3.
  Further, in the electric oil pump device 1 of the present embodiment, a control board (hereinafter referred to as a board) 24 of the controller 4 for controlling the brushless motor 3 is accommodated in a control chamber 23 provided on the rear end side of the motor housing 15. Then, the motor housing 15 is attached to the rear end surface of the motor housing 15 with screws. On the substrate 24, based on the inverter circuit that converts the DC power source into AC and supplies the drive current to each coil 17 of the brushless motor 3, and the rotational position information of the outer rotor 10 detected by a sensor such as a Hall element. A control circuit unit 25 including a control circuit for controlling the inverter circuit is mounted. The inverter circuit constituting the control circuit unit 25 of the controller 4 and electronic components such as a microcomputer, a coil, and a capacitor of the control circuit are mounted on both surfaces of the substrate 24.
  The bus bar 18 that is a phase output terminal of the brushless motor 3 connected to each coil 17 and insulated and supported by the insulator 21 is inserted into a through hole provided in the substrate 24 and connected to the control circuit unit 25 on the substrate 24. ing. The bus bar 18 is a connecting member that electrically connects the winding start ends of the coils 17 of the respective phases, and in this embodiment, the bus bar 18 is molded on each of the three insulators 21. The bus bar 18 is formed as a relay member that is electrically connected to the substrate 24, and constitutes an electrode for each phase.
  Further, a connector shell 19 is provided integrally with the motor housing 15 on the side surface of the motor housing 15, and a plurality of connector pins (terminal portions) 20 therein are inserted into through holes provided in the substrate 24 and soldered. The control circuit unit 25 on the substrate 24 is electrically connected. The connector shell 19 is fitted with a harness connector (not shown) to which a separate power source is connected.
  Here, the motor housing 15 and the cover 27, both of which are formed of a resin material, are joined using spin welding. An annular welding rib is formed on the back surface side of the cover 27 that covers the rear opening of the motor housing 15, and the welding rib is heated and melted while the cover 27 is rotated, and is fixed to the motor housing of the counterpart component. It welds by pressing on 15 concave-shaped parts. Further, the electric oil pump device 1 is assembled by inserting the rotor 6 into the central portion of the motor housing 15 and fixing the pump housing 13 and the pump plate 14 to the mounting stator 5.
  With the above configuration, the drive current controlled by the control circuit unit 25 is supplied to each coil 17 of the brushless motor 3. Thereby, a rotating magnetic field is generated in the coil 17, torque is generated in the permanent magnet 8, and the rotor 6 is rotationally driven. Thus, when the inner rotor 11 is driven to rotate, the outer rotor 10 is driven and rotated, and the gap between the inner teeth of the outer rotor 10 and the outer teeth of the inner rotor 11 is repeatedly expanded and contracted. Pump operation is performed to suck and discharge oil through the port.
Next, FIG. 3 is a plan view showing the shape of the insulator to be mounted on the stator portion of the brushless motor according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of the insulator portion as seen from A-A direction in FIG. 3 It is.
  Referring to FIG. 1, an insulator 21 attached to each tooth 30 of stator core 9 is a pair of a front-side insulator inserted from the oil pump 2 side and a rear-side insulator inserted from the opposite side. It is configured as a member. Then, as shown in FIG. 3 (viewed from the rear side), a coil 17 is formed by winding a winding through an insulator 21 attached to the tooth 30.
  Two storage grooves (binding grooves) 26a that are linear along the radial direction on both sides in the circumferential direction of the distal end portion of the outer radial direction on the rear side (see FIG. 1, rear side direction) in the rotational axis direction of each insulator 21. , 26b are formed. The winding end portion of the coil 17 at the start of winding is fitted and fixed in the storage groove 26a, and the winding end portion of the winding end of the coil 17 is fitted in the other storage groove 26b. The storage groove 26b has a straight shape with a uniform width in the axial direction toward the bottom of the storage groove 26b. Here, both ends of the winding of the coil 17 are both taken out from the rear side of the insulator 21 provided with the storage groove 26.
  As shown in FIG. 4, one storage groove 26 a of the insulator 21 has a tapered shape, and the width thereof extends toward the bottom (downward oil pump side) of the storage groove 26 a in the axial direction of the insulator 21 indicated by an arrow. It is inclined to narrow. At this time, for example, the winding of the coil 17a with a large wire diameter is sandwiched between the wide upper portions of the storage groove 26a, and the winding of the coil 17b with a small wire diameter is sandwiched between the lower portions of the narrow storage grooves 26a. Fixed.
Below, with reference to FIG . 1 and FIG. 3 , the winding of the rear side of the stator 5 and an assembly method are demonstrated. First, the winding end portion of the winding of the coil 17 is fitted and fixed in one housing groove 26a of the insulator 21 incorporated in the divided teeth 30 of the stator core 9, and the winding is wound a predetermined number of turns. Next, the winding end of the winding end of the coil 17 is fitted into the other storage groove 26 b, and the winding start and end of the winding are bent according to the outer shape of the insulator 21. Subsequently, each stator assembly in which the insulator 21 and the wound coil 17 are incorporated in the teeth 30 of the stator core 9 is press-fitted into the collar 16 in the motor housing 15. A winding end (for example, U phase) at the beginning of winding of the wound coil 17 is sandwiched between tip portions (slit-like portions) of bus bar terminals (not shown) formed integrally with the insulator 21. Similarly, the winding end portion of the coil 17 at the end of winding is sandwiched between the tip portions of an annular bus bar terminal (not shown) fitted into the insulator 21.
  The winding end of the coil 17 wound around each phase and sandwiched between the front ends of the bus bar terminals is resistance welded by fusing to form the rear side of the stator 5. Thereafter, the stator 5 is molded into the motor housing 15 by integral molding.
  Next, the operation and effect of the brushless motor 3 according to the present embodiment configured as described above will be described.
  According to the above configuration, both ends of the coil 17 wound around the insulator 21 mounted on each of the divided teeth 30 forming the stator core 9 are arranged on the outer circumference of the insulator 21 opposite to the oil pump 2 in the axial direction. It is fitted and fixed in a storage groove 26 formed linearly on the end face of the side tip. One housing groove 26 a that houses the winding end portion of the coil 17 at the start of winding has a taper shape, and its width is narrower toward the bottom (oil pump side) of the housing groove 26 a in the axial direction of the insulator 21. It is inclined to become.
  As a result, the winding end portion of the coil 17 at the start of winding is fitted and fixed in the storage groove 25a, so that sufficient tension is ensured and the winding of the coil 17 is not scattered or loosened. It is possible to wind reliably in line with. As a result, the coil 17 can be easily wound. Furthermore, if the shape of the stator core 9 is the same, for example, in the case of the brushless motor 3 with different output torque, even if the wire diameter of the coil 17 changes, there is no need to change the width of the storage groove 26a of the insulator 21. 21 can be shared.
  As described above, according to this embodiment, when winding the coil winding around each tooth of the stator core, the winding end portion of the coil winding start can be reliably fixed to the insulator, and the winding work can be easily performed. An electric motor that can be provided can be provided.
  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, an example in which one storage groove 26a provided in the insulator 21 is formed in a tapered shape and the winding end of the winding start of the coil 17 is fitted and fixed is shown, but is not limited thereto, The other storage groove 25b into which the winding end at the end of winding of the coil 17 is fitted may also be formed in a tapered shape. Further, the storage groove 26 may have another shape (for example, a stepped shape) and an arrangement as long as the winding end portion of the coil 17 can be reliably prevented.
  Although the case where the brushless motor 2 is applied to the electric oil pump device 1 has been described in the above embodiment, the present invention is not limited to this, and other devices using the same brushless motor 2 (for example, an electric power steering device). Etc.).
  Moreover, although the case where the internal gear type 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. .
  Furthermore, in the said embodiment, although the rotor 5 of the brushless motor 2 showed the case where the some permanent magnet 7 was arrange | positioned and fixed to the outer peripheral part of the rotational drive shaft 6, what fixed the ring-shaped permanent magnet was shown. You may make it use.
1: electric oil pump device, 2: oil pump, 3: brushless motor (electric motor), 4: controller, 5: stator for motor, 6: rotor for motor, 7: rotary drive shaft (rotary shaft), 8: permanent Magnet: 9: Stator core, 10: Outer rotor for pump, 11: Inner rotor for pump, 12: Pump chamber, 13: Pump housing, 14: Pump plate,
15: motor housing, 16: collar, 17, 17a, 17b: motor coil, 18: bus bar, 19: connector shell, 20: connector pin, 21: insulator, 22: rotor holding member, 23: control chamber, 24: substrate 25: Control circuit section,
26, 26a, 26b: storage groove, 27: cover, 28, 29: bearing, 30: teeth

Claims (1)

  1. A motor housing;
    A stator core in which the teeth are arranged in an annular shape;
    An insulator that covers and insulates the teeth portion;
    A stator in which a coil is wound around the teeth portion via the insulator and fixed in the motor housing;
    A rotor arranged to be rotatable while facing the inner peripheral surface of the stator,
    The insulator includes a plurality of linear storage grooves into which end portions of the coil extending in the radial direction are fitted in the distal end portion in the outer diameter direction of the rear side end surface in the rotation axis direction,
    The electric motor according to claim 1, wherein at least one of the storage grooves is inclined so that a width thereof becomes narrower toward a bottom portion of the storage groove in the rotation axis direction of the insulator.
JP2012117447A 2012-05-23 2012-05-23 Electric motor Pending JP2013247698A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012117447A JP2013247698A (en) 2012-05-23 2012-05-23 Electric motor

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Application Number Priority Date Filing Date Title
JP2012117447A JP2013247698A (en) 2012-05-23 2012-05-23 Electric motor

Publications (1)

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JP2013247698A true JP2013247698A (en) 2013-12-09

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Family Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015177562A (en) * 2014-03-13 2015-10-05 日立オートモティブシステムズ株式会社 Motor pump
WO2019058643A1 (en) * 2017-09-20 2019-03-28 パナソニックIpマネジメント株式会社 Insulator, and stator and motor comprising same
WO2019058649A1 (en) * 2017-09-20 2019-03-28 パナソニックIpマネジメント株式会社 Insulator, and stator and motor comprising same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015177562A (en) * 2014-03-13 2015-10-05 日立オートモティブシステムズ株式会社 Motor pump
WO2019058643A1 (en) * 2017-09-20 2019-03-28 パナソニックIpマネジメント株式会社 Insulator, and stator and motor comprising same
WO2019058649A1 (en) * 2017-09-20 2019-03-28 パナソニックIpマネジメント株式会社 Insulator, and stator and motor comprising same
CN111066226A (en) * 2017-09-20 2020-04-24 松下知识产权经营株式会社 Insulator, stator including the same, and motor including the same
CN111095740A (en) * 2017-09-20 2020-05-01 松下知识产权经营株式会社 Insulator, stator including the same, and motor including the same
EP3687042A4 (en) * 2017-09-20 2020-10-28 Panasonic Intellectual Property Management Co., Ltd. Insulator, and stator and motor comprising same

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