WO2020039961A1 - モータ、電動パワーステアリング装置、モータの製造方法、バスバーユニット、及びバスバーユニットの製造方法 - Google Patents

モータ、電動パワーステアリング装置、モータの製造方法、バスバーユニット、及びバスバーユニットの製造方法 Download PDF

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Publication number
WO2020039961A1
WO2020039961A1 PCT/JP2019/031362 JP2019031362W WO2020039961A1 WO 2020039961 A1 WO2020039961 A1 WO 2020039961A1 JP 2019031362 W JP2019031362 W JP 2019031362W WO 2020039961 A1 WO2020039961 A1 WO 2020039961A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
phase
stator
bus
holder
Prior art date
Application number
PCT/JP2019/031362
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
優太 二之宮
裕也 齋藤
敬史 瀬口
服部　隆志
Original Assignee
日本電産株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to JP2020538305A priority Critical patent/JPWO2020039961A1/ja
Priority to CN201980054101.8A priority patent/CN112567601B/zh
Publication of WO2020039961A1 publication Critical patent/WO2020039961A1/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto

Definitions

  • the present invention relates to a motor, an electric power steering device, a method for manufacturing a motor, a busbar unit, and a method for manufacturing a busbar unit.
  • bus bar holder of Patent Document 1 between the U, V, and W phase side bus bars and the neutral point bus bar, two gaps without bus bars are provided on circumferential equal lines. Due to heat and cooling at the time of molding the bus bar holder, the bus bar may be deformed in the vertical direction starting from the line connecting the gaps. Due to this deformation, the positional accuracy of the connection terminals of the bus bar may be varied, or the bus bar may be cracked.
  • An object of the present invention is to provide a motor, an electric power steering device, a method for manufacturing a motor, a bus bar unit, and a method for manufacturing a bus bar unit, which suppress deformation of a bus bar during manufacturing.
  • a motor includes a shaft extending along a central axis, a rotor fixed to the shaft, a stator having a conductive wire disposed radially outside the rotor, and a stator radially outside the stator.
  • a housing is provided, a plurality of bus bars electrically connected to the conductive wires, and a bus bar holder arranged on one axial end of the stator and holding the plurality of bus bars.
  • the plurality of busbars are arranged in a substantially annular shape as a whole, and include a first busbar having an arc shape, a second busbar having an arc shape, and an end overlapping portion.
  • the second bus bar has a different axial position from the first bus bar. At the end overlapping portion, one end of the first bus bar and one end of the second bus bar overlap in the circumferential direction.
  • a gap where no bus bar exists is arranged at a position radially opposed to the end overlapping portion.
  • the plurality of busbars are arranged in a substantially annular shape as a whole, and include a first busbar having an arc shape, a second busbar having an arc shape different from the first busbar in the axial direction, and a second busbar.
  • An end overlap portion is provided in which one end of the first bus bar and one end of the second bus bar overlap in the circumferential direction, and a gap where no bus bar exists is disposed at a position radially opposed to the end overlap portion.
  • the end overlapping portion resists the force acting on the bus bar due to heat and cooling during molding, and suppresses deformation of the bus bar. This suppresses the occurrence of cracks in the bus bar, stabilizes the form of the bus bar, and improves the positional accuracy of the connection terminals provided on the bus bar.
  • FIG. 1 is a cross-sectional view illustrating the motor according to the first embodiment.
  • FIG. 2 is a perspective view of the bus bar unit of the first embodiment.
  • FIG. 3 is a perspective view of the bus bar of the first embodiment.
  • FIG. 4 is an exploded perspective view of the bus bar of FIG.
  • FIG. 5 is a perspective view showing an end overlapping portion which is a part of the bus bar of FIG.
  • FIG. 6A is a cross-sectional view of the bus bar unit taken along the line AA ′ in FIG.
  • FIG. 6B is a cross-sectional view of the bus bar unit taken along the line BB ′ in FIG.
  • FIG. 6C is a cross-sectional view of the bus bar unit taken along the line CC ′ in FIG.
  • FIG. 6D is a cross-sectional view of the bus bar unit taken along the line DD ′ in FIG.
  • FIG. 7 is a perspective view of a bus bar according to the second embodiment.
  • FIG. 8 is a schematic diagram of an electric power steering device according to another embodiment.
  • C is the central axis of the motor.
  • the direction in which the central axis C extends is defined as the axial direction. Further, one along the axial direction is defined as an upper side, and the other is defined as a lower side.
  • the vertical direction in this specification is used for specifying a positional relationship, and does not limit an actual direction or a positional relationship.
  • the direction of gravity is not necessarily downward.
  • a direction perpendicular to the rotation axis of the motor is referred to as a “radial direction”.
  • a direction along an arc centered on the rotation axis of the motor is called a “circumferential direction”.
  • the motor 1 includes a shaft 31, a rotor 30, a stator 40, a housing 20, and a bus bar unit 50.
  • the shaft 31 extends along the central axis C, and is supported by the upper bearing 71 and the lower bearing 72 so as to be rotatable around the central axis C.
  • the rotor 30 is fixed to the shaft 31 and rotates together with the shaft 31 around the central axis C.
  • the upper bearing 71 is held by a bearing holder (not shown) located above the stator 40.
  • the stator 40 is disposed radially outside the rotor 30 so as to face the rotor 30.
  • the stator 40 has a stator core 41, an insulator 42, and a coil wire 43.
  • the insulator 42 is attached to a tooth (not shown) of the stator core 41.
  • the coil wire 43 is an example of a conductive wire, and is wound around the teeth with the insulator 42 interposed therebetween.
  • the coil wire 43 wound around the stator 40 is drawn out above the stator 40, and is connected to a coil connection terminal 65 shown in FIG.
  • the housing 20 is disposed radially outside the stator 40, and the stator 40 is fixed to the housing 20 by shrink fitting, press fitting, bonding, caulking, or the like.
  • the housing 20 has a bottomed cylindrical shape centered on the central axis C.
  • the housing 20 has a cylindrical portion 21 extending in the axial direction, a bottom portion 23 located at a lower end of the cylindrical portion 21, and an opening 24 opening upward.
  • a lower bearing holder 25 that holds the lower bearing 72 is provided at the center of the bottom 23.
  • the shape of the housing 20 is not limited to a cylindrical shape.
  • the cross section of the housing 20 may be, for example, a polygon. Further, the housing 20 may be cylindrical, instead of having a bottom.
  • the busbar unit 50 is disposed axially above the stator 40. As shown in FIG. 2, the bus bar unit 50 includes a bus bar holder 51 and a bus bar 60.
  • the bus bar holder 51 is disposed at one axial end of the stator 40 and holds a plurality of bus bars 60 therein.
  • the bus bar holder 51 is made of an insulating material such as a resin.
  • the bus bar holder 51 has an annular main body 53, a plurality of legs 55, and a connecting portion 59.
  • the annular main body 53 covers the bus bar 60 of each phase described later.
  • the main body 53 does not need to completely cover the bus bar 60 of each phase.
  • a plurality of windows 53a which are portions not covering the bus bar 60 may be provided on the upper surface side.
  • the connecting portion 59 extends from the main body 53 to the opposite side of the stator 40, in the illustrated example, upward, and holds three external connection terminals 67.
  • the connection portion 59 surrounds the rising portions of the three external connection terminals 67 excluding the tip portions.
  • the connection portion 59 is provided at one place, but may be provided at two or more places according to the wiring of the bus bar 60.
  • the tip of each leg 55 is inserted into a groove (not shown) formed outside the stator 40, and the position of the bus bar unit 50 with respect to the stator 40 is fixed.
  • the tip of the leg 55 may be inserted into a groove (not shown) formed in the insulator 42 to fix the position of the bus bar unit 50.
  • the plurality of bus bars 60 are conductive members. As shown in FIGS. 3 and 4, the plurality of busbars 60 include an arc-shaped neutral point busbar 60n as an example of a first busbar, a V-phase busbar 60v as an example of a second busbar, and an example of a third busbar. And a U-phase bus bar 60u which is an example of the fourth bus bar.
  • the plurality of bus bars 60 are stacked in the bus bar holder 51 in the following predetermined arrangement.
  • the plurality of busbars 60 are arranged in a substantially annular shape as a whole.
  • the substantially annular shape includes an incomplete annular shape in which a gap is partially formed.
  • the V-phase bus bar 60v is arranged at a position in the axial direction different from that of the neutral point bus bar 60n, here, below the neutral point bus bar 60n.
  • One end of the neutral-point bus bar 60n and one end of the V-phase bus bar 60v form an end overlapping portion 68 that overlaps in the circumferential direction, as shown in FIG.
  • a gap 69 where no bus bar exists is arranged at a position radially opposed to the end overlapping portion 68.
  • the expression that the gap 69 is disposed at a position radially opposed to the end overlapping portion 68 means that the end overlapping portion 68 and the gap 69 are located on L1 shown in FIG.
  • the present invention is not limited to being on a substantially equal line of a circle formed by the above, and may be on a line deviated to one of the equal lines of the circle.
  • the gap 69 is also disposed adjacent to the other end of the neutral point bus bar 60n, that is, the end opposite to the end overlapping portion 68.
  • the W-phase bus bar 60w is disposed at a position in the axial direction different from that of the V-phase bus bar 60v, here, above the V-phase bus bar 60v.
  • the circumferential position of the W-phase bus bar 60w overlaps the circumferential position of the V-phase bus bar 60v.
  • the U-phase bus bar 60u is arranged at a position in an axial direction different from the V-phase bus bar 60v and the W-phase bus bar 60w, here, below the V-phase bus bar 60v and the W-phase bus bar 60w.
  • the circumferential position of the U-phase bus bar 60u overlaps the circumferential position of the V-phase bus bar 60v and the W-phase bus bar 60w.
  • the gap 69 is provided between one end of each of the V-phase bus bar 60v, the W-phase bus bar 60w, and the U-phase bus bar 60u, and the other end of the neutral point bus bar 60n.
  • the plurality of bus bars 60 and the bus bar holder 51 are formed by insert molding.
  • the insulating material of the bus bar holder 51 is interposed in the gap 69.
  • the insulating material of the main body 53 of the bus bar holder 51 is interposed between the stacked bus bars 60 in the axial direction so as not to contact each other.
  • a neutral point bus bar 60n is arranged in the cross section of the bus bar unit 50 at the position of AA ′ in FIG. 3, a neutral point bus bar 60n is arranged.
  • FIG. 6B in the cross section of the bus bar unit 50 at the position of BB ′ in FIG. 3, the V-phase bus bar 60v is disposed axially below the neutral point bus bar 60n.
  • FIG. 6A in the cross section of the bus bar unit 50 at the position of AA ′ in FIG. 3
  • the V-phase bus bar 60v is disposed axially below the neutral point bus bar 60n.
  • the U-phase bus bar 60u is disposed axially below the V-phase bus bar 60v.
  • the W-phase bus bar 60w is disposed axially above the V-phase bus bar 60v, and the V-phase bus bar 60v A U-phase bus bar 60u is arranged axially below.
  • the neutral-point bus bar 60n, the U-phase bus bar 60u, the V-phase bus bar 60v, and the W-phase bus bar 60w each have a plurality of coil connections connected to the coil wire 43.
  • the terminal 65 is provided.
  • the coil connection terminal 65 is an example of a conductive wire connection terminal, is arranged along the circumferential direction of each bus bar 60, and protrudes radially outward from the bus bar 60 arranged annularly.
  • the V-phase bus bar 60v, the W-phase bus bar 60w, and the U-phase bus bar 60u each have external connection terminals 67v, 67w, and 67u at one end.
  • the external connection terminals 67v, 67w, and 67u extend on the opposite side to the stator 40, that is, upward in the axial direction, and are electrically connected to an external power supply (not shown).
  • bus bar unit manufacturing method In manufacturing the bus bar unit 50 shown in FIG. 2, a plurality of metal bus bars 60 are inserted into a mold (not shown) in a predetermined arrangement, and a resin is injected into the mold. The bus bar holder 51 integrally formed with the plurality of bus bars 60 is taken out. In a predetermined arrangement, the plurality of busbars 60 are arranged in a substantially annular shape as a whole, and arcuate V-phase busbars 60v are arranged at axially lower positions with respect to arcuate neutral point busbars 60n.
  • An end overlap portion 68 is formed by overlapping one end of the neutral point bus bar 60n and one end of the V-phase bus bar 60v in the circumferential direction, and the bus bar 60 exists at a position radially opposed to the end overlap portion 68.
  • Gap 69 is formed.
  • W-phase bus bar 60w is arranged at a position axially above V-phase bus bar 60v.
  • the circumferential position of the W-phase bus bar 60w overlaps the circumferential position of the V-phase bus bar 60v.
  • the U-phase bus bar 60u is arranged at a position axially below the V-phase bus bar 60v and the W-phase bus bar 60w.
  • the circumferential position of the U-phase bus bar 60u overlaps the circumferential position of the V-phase bus bar 60v and the W-phase bus bar 60w.
  • the bus bar unit 50 manufactured by the above-described method is arranged at one axial end of the stator 40. At this time, the tip of the leg 55 of the bus bar holder 51 is inserted into the groove of the stator 40 or the groove of the insulator 42 to fix the position of the bus bar unit 50.
  • the coil wire 43 of the stator 40 is connected to a coil connection terminal 65 projecting radially outward of the bus bar holder 51 as shown in FIG.
  • the stator 40 to which the bus bar unit 50 is connected is inserted into the housing 20.
  • the stator 40 is fixed to the housing 20 by shrink fitting, press fitting, bonding, caulking, or the like.
  • the rotor 30 is inserted inside the stator 40 in the radial direction.
  • the plurality of busbars are arranged in a substantially annular shape as a whole, and have an arc-shaped neutral point busbar 60n and a neutral point busbar 60n.
  • An arc-shaped V-phase bus bar 60v having a different axial position, and an end overlapping portion 68 in which one end of the neutral point bus bar 60n and one end of the V-phase bus bar 60v overlap in the circumferential direction are included.
  • a gap 69 where no bus bar exists is arranged at a position radially opposed to the end overlapping portion 68.
  • the bus bars 60 if there are two gaps, the bus bars 60 arranged annularly along the axial direction starting from the line connecting the two gaps due to heat and cooling during molding of the bus bar unit 50. May be deformed.
  • one gap 69 is provided, and an end overlapping portion 68 in which ends of the bus bar 60 are circumferentially overlapped with each other at a position radially opposed to the gap 69.
  • the end overlapping portion 68 can oppose the force acting toward the starting point due to heat and cooling at the time of molding the bus bar unit 50, the deformation of the bus bar 60 is suppressed.
  • FIG. 7 shows a configuration of a plurality of bus bars 260 according to the second embodiment.
  • the neutral point bus bar 60n has an end extension 268 at a position radially opposed to the end overlap 68.
  • the end extension 268 extends in the circumferential direction beyond L1, which is a substantially equal line of a circle formed by the bus bar 260. Due to the presence of the end extension 268, the gap 69 where no bus bar exists is smaller than the gap 69 according to the first embodiment.
  • both ends in the circumferential direction of the neutral point bus bar 60n project beyond L1. For this reason, deformation of the bus bar 260 due to heat and cooling during molding of the bus bar unit is further suppressed.
  • the number of bus bars 60 and 260 and the arrangement of each phase are not limited to the above example.
  • the number of the bus bars 60 and 260 can be adjusted according to the number of phases of the motor 1.
  • the second bus bar forming the end overlapping portion 68 together with one end of the neutral point bus bar 60n may be a W-phase bus bar or a U-phase bus bar.
  • the axial arrangement and circumferential positions of the V-phase busbar, the W-phase busbar, and the U-phase busbar can also be changed.
  • the electric power steering device 2 is mounted on a steering mechanism of a wheel 912 of an automobile.
  • the electric power steering device 2 is a column-type electric power steering device that directly reduces the steering force by the power of the motor 1.
  • the electric power steering device 2 includes the motor 1, a steering shaft 914, and an axle 913.
  • the steering shaft 914 transmits an input from the steering 911 to an axle 913 having wheels 912.
  • the power of the motor 1 is transmitted to the axle 913 via a ball screw.
  • the motor 1 employed in the column-type electric power steering device 2 is provided inside an engine room (not shown). Although the electric power steering device 2 shown in FIG. 8 is a column type, it may be a rack type.
  • the electric power steering device 2 includes a motor 1. For this reason, the electric power steering device 2 having the same effects as the above embodiment can be obtained.
  • the electric power steering device 2 is described as an example of a method of using the motor 1, but the method of using the motor 1 is not limited, and the motor 1 can be used in a wide range such as a pump and a compressor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Power Steering Mechanism (AREA)
  • Manufacture Of Motors, Generators (AREA)
PCT/JP2019/031362 2018-08-20 2019-08-08 モータ、電動パワーステアリング装置、モータの製造方法、バスバーユニット、及びバスバーユニットの製造方法 WO2020039961A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2020538305A JPWO2020039961A1 (ja) 2018-08-20 2019-08-08 モータ、電動パワーステアリング装置、モータの製造方法、バスバーユニット、及びバスバーユニットの製造方法
CN201980054101.8A CN112567601B (zh) 2018-08-20 2019-08-08 马达、电动助力转向装置、马达的制造方法、汇流条单元以及汇流条单元的制造方法

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Application Number Priority Date Filing Date Title
JP2018-154024 2018-08-20
JP2018154024 2018-08-20

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CN (1) CN112567601B (zh)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020261866A1 (ja) * 2019-06-28 2020-12-30 日本電産株式会社 バスバー及びモータ
WO2023162374A1 (ja) * 2022-02-25 2023-08-31 株式会社Ihi バスバーユニットの製造方法、バスバー、バスバーユニット及び電動機械
WO2023190308A1 (ja) * 2022-03-30 2023-10-05 本田技研工業株式会社 回転電機、車両、およびバスリング

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022237589A1 (zh) * 2021-05-14 2022-11-17 安徽威灵汽车部件有限公司 汇流组件、电机、电动助力转向系统和车辆
DE102022213076A1 (de) 2022-12-05 2024-06-06 Zf Friedrichshafen Ag Elektrische Maschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010233327A (ja) * 2009-03-26 2010-10-14 Mitsuba Corp ブラシレスモータ
JP2014176213A (ja) * 2013-03-08 2014-09-22 Kayaba Ind Co Ltd バスバーユニット
JP2015216714A (ja) * 2014-05-07 2015-12-03 日本精工株式会社 電動機、電動パワーステアリング装置および車両

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010200400A (ja) * 2009-02-23 2010-09-09 Nippon Densan Corp ステータ、バスバーユニット、モータ、及びパワーステアリング装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010233327A (ja) * 2009-03-26 2010-10-14 Mitsuba Corp ブラシレスモータ
JP2014176213A (ja) * 2013-03-08 2014-09-22 Kayaba Ind Co Ltd バスバーユニット
JP2015216714A (ja) * 2014-05-07 2015-12-03 日本精工株式会社 電動機、電動パワーステアリング装置および車両

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020261866A1 (ja) * 2019-06-28 2020-12-30 日本電産株式会社 バスバー及びモータ
WO2023162374A1 (ja) * 2022-02-25 2023-08-31 株式会社Ihi バスバーユニットの製造方法、バスバー、バスバーユニット及び電動機械
WO2023190308A1 (ja) * 2022-03-30 2023-10-05 本田技研工業株式会社 回転電機、車両、およびバスリング

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CN112567601B (zh) 2024-04-02
CN112567601A (zh) 2021-03-26

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