WO2018159188A1 - Moteur - Google Patents

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Publication number
WO2018159188A1
WO2018159188A1 PCT/JP2018/002867 JP2018002867W WO2018159188A1 WO 2018159188 A1 WO2018159188 A1 WO 2018159188A1 JP 2018002867 W JP2018002867 W JP 2018002867W WO 2018159188 A1 WO2018159188 A1 WO 2018159188A1
Authority
WO
WIPO (PCT)
Prior art keywords
bus bar
bar holder
stator
vertical direction
holder
Prior art date
Application number
PCT/JP2018/002867
Other languages
English (en)
Japanese (ja)
Inventor
幸祐 小川
敬史 瀬口
俊輔 村上
剛央 新子
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 JP2019502519A priority Critical patent/JP7024776B2/ja
Priority to CN201890000552.4U priority patent/CN210578010U/zh
Publication of WO2018159188A1 publication Critical patent/WO2018159188A1/fr

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Classifications

    • 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

Definitions

  • the present invention relates to a motor.
  • Patent Document 1 A structure in which a bus bar holder that supports a bus bar is fixed to a motor housing is known (for example, Patent Document 1).
  • the bus bar holder is made of an insulating material such as a resin in order to ensure insulation between the bus bars.
  • an insulating material such as a resin
  • One aspect of the present invention is to increase the load resistance of the bus bar holder in view of the above problems.
  • One aspect of the motor of the present invention includes a rotor that rotates about a central axis that extends in the up-down direction, a coil wire, a stator that is positioned radially outside the rotor, and a bus bar to which the coil wire is connected.
  • a bus bar holder that is located above the stator and supports the bus bar, and a cylindrical housing that surrounds the stator and the bus bar holder from the outside in the radial direction, and the bus bar holder is made of a resin material.
  • a metal piece fixed to the main body and provided with a contact surface facing downward, and a support surface facing the contact surface facing upward is provided on the inner peripheral portion of the housing. .
  • a motor with an increased load resistance of the bus bar holder is provided.
  • FIG. 1 is a perspective view of a motor according to an embodiment.
  • FIG. 2 is a cross-sectional view taken along the central axis of the motor according to the embodiment.
  • FIG. 3 is an enlarged view of region III in FIG.
  • FIG. 4 is a cross-sectional view showing the support structure of the bus bar by the main body.
  • FIG. 5 is a schematic diagram illustrating an electric power steering apparatus according to an embodiment.
  • FIG. 1 is a perspective view of a motor 1 according to an embodiment.
  • FIG. 2 is a cross-sectional view taken along the central axis J of the motor 1.
  • FIG. 3 is an enlarged view of region III in FIG.
  • the motor 1 includes a rotor 30 that rotates about a central axis J that extends in the vertical direction, a stator 40 having a plurality of coils 43, an upper bearing 54, a lower bearing 55, and a bearing holder. 50, a housing 20, a plurality of bus bars 70, and a bus bar holder 60 that supports the bus bars.
  • the housing 20 has a bottomed cylindrical shape surrounding the stator 40, the bearing holder 50, and the bus bar holder 60 from the radially outer side.
  • the housing 20 opens upward.
  • the upper opening of the housing 20 is covered with the bearing holder 50.
  • the housing 20 has a cylindrical portion 20a and a bottom portion 20b.
  • the cylindrical portion 20a is a cylinder extending along the central axis J.
  • the cylindrical portion 20a surrounds the stator 40 from the radially outer side.
  • the bottom part 20b covers the lower opening of the cylinder part 20a.
  • the bottom portion 20b is provided with a first holding hole 20c through which the shaft 31 of the rotor 30 passes.
  • the housing 20 holds the outer ring of the lower bearing 55 on the inner peripheral surface of the first holding hole 20c.
  • the 1st collar part 20d which protrudes to a radial inside is provided in the lower end of the internal peripheral surface of the 1st holding hole 20c.
  • the outer ring of the lower bearing 55 is in contact with the upper surface of the first flange 20d.
  • the cylindrical portion 20a has an inner peripheral portion 21 that surrounds the stator 40, the bearing holder 50, and the bus bar holder 60 from the radially outer side.
  • the housing 20 holds the stator 40, the bearing holder 50, and the bus bar holder 60 at the inner peripheral portion 21.
  • the inner peripheral portion 21 includes a stepped portion 21a, a large diameter portion 21b located above the stepped portion 21a, and a small diameter portion 21c located below the stepped portion 21a.
  • the step portion 21a has a support surface 22 facing upward.
  • the support surface 22 extends uniformly along the circumferential direction.
  • the radially outer end of the support surface 22 is continuous with the large diameter portion 21b.
  • the radially inner end of the support surface 22 is continuous with the small diameter portion 21c.
  • the large diameter portion 21b has a larger inner diameter than the small diameter portion 21c.
  • the inner peripheral surface of the large diameter portion 21 b is in contact with the outer peripheral surface 50 b of the bearing holder 50.
  • the inner peripheral surface of the small diameter portion 21 c is in contact with the outer peripheral surface 41 a of the stator 40.
  • the rotor 30 includes a shaft 31, a rotor core 32, and a rotor magnet 33.
  • the shaft 31 is centered on a central axis J extending in the vertical direction.
  • the shaft 31 is supported by the lower bearing 55 and the upper bearing 54 so as to be rotatable around the central axis J.
  • the lower end portion of the shaft 31 protrudes below the bottom portion 20b.
  • the lower end portion of the shaft 31 is connected to a transmission member such as a gear or a coupling, and outputs torque.
  • the rotor core 32 is fixed to the outer peripheral surface of the shaft 31.
  • the rotor core 32 surrounds the shaft 31 in the circumferential direction.
  • the rotor core 32 is located between the lower bearing 55 and the upper bearing 54 in the vertical direction.
  • the rotor magnet 33 is a permanent magnet.
  • the rotor magnet 33 is fixed to the outer surface along the circumferential direction of the rotor core 32.
  • the upper bearing 54 rotatably supports the upper portion of the shaft 31.
  • the upper bearing 54 is located above the stator 40.
  • the lower bearing 55 rotatably supports the lower portion of the shaft 31.
  • the lower bearing 55 is located on the lower side of the stator 40.
  • the upper bearing 54 and the lower bearing 55 are ball bearings.
  • the types of the upper bearing 54 and the lower bearing 55 are not particularly limited, and other types of bearings may be used.
  • the bearing holder 50 is located above the stator 40.
  • the bearing holder 50 has a disk shape centered on the central axis J.
  • the outer peripheral surface 50 b of the bearing holder 50 is fixed to the inner peripheral portion 21 of the housing 20.
  • the bearing holder 50 is provided with a second holding hole 50c penetrating in the vertical direction and two terminal insertion holes 51. Three connection terminals 77 are inserted through the terminal insertion holes 51 (see FIG. 1).
  • the second holding hole 50c is located in the center of the bearing holder 50 in plan view.
  • the shaft 31 is inserted through the second holding hole 50c.
  • the bearing holder 50 holds the outer ring of the upper bearing 54 on the inner peripheral surface of the second holding hole 50c.
  • a second flange 50d that protrudes radially inward is provided at the upper end of the inner peripheral surface of the second holding hole 50c.
  • the outer ring of the upper bearing 54 is in contact with the upper surface of the second flange 50d.
  • the stator 40 is located on the radially outer side of the rotor 30.
  • the stator 40 includes a stator core 41, an insulator 42, and a coil 43.
  • the coil 43 is composed of a coil wire 43a. That is, the stator 40 has a coil wire 43a.
  • the stator 40 is fixed to the inner peripheral portion 21 of the housing 20 on the outer peripheral surface 41 a of the stator core 41.
  • the insulator 42 is made of an insulating material. The insulator 42 covers at least a part of the stator core 41.
  • the coil 43 is configured by winding a coil wire 43 a around the stator 40 via an insulator 42.
  • the coil 43 excites the stator core 41 when the motor 1 is driven.
  • the coil wire 43 a constituting the coil 43 is drawn to the coil wire connecting portion 71 of the bus bar 70.
  • the bus bar 70 includes a coil wire connection portion 71, a connection terminal 77, and a connection portion 72 that connects the coil wire connection portion 71 and the connection terminal 77. That is, the motor 1 has a connection terminal 77 that is electrically connected to the external device 9.
  • the connection terminal 77 and the bus bar 70 are one member connected to each other, but the connection terminal 77 and the bus bar 70 may be separate members.
  • the bus bar 70 is formed by pressing a conductive metal plate.
  • board thickness direction corresponds with an axial direction.
  • board thickness direction is orthogonal to an axial direction.
  • the coil wire connection portion 71 and the connection terminal 77 are formed by being bent in the axial direction with respect to the coupling portion 72.
  • the coil wire connection portion 71 is electrically connected to the coil wire 43a.
  • the coil wire connecting portion 71 has, for example, a U shape that sandwiches the coil wire 43a.
  • the coil wire connecting portion 71 and the coil wire 43a are fixed to each other by welding and electrically connected.
  • the coil wire connecting portion 71 connects the coil wire connecting portion 71 and the coil wire 43a by sandwiching the coil wire 43a in the circumferential direction with two electrodes sandwiched in the circumferential direction and resistance welding.
  • the coil wire connecting portion 71 and the coil wire 43a may be fixed by welding other than resistance welding such as arc welding, plastic deformation such as caulking, soldering, adhesion with a conductive adhesive, or the like.
  • connection terminal 77 extends along the vertical direction.
  • the connection terminal 77 passes through the terminal insertion hole 51 provided in the bearing holder 50 and protrudes above the bearing holder 50.
  • the connection terminal 77 is inserted into the socket of the external device 9 on the upper side of the bearing holder 50 and is electrically connected to the external device 9.
  • the bus bar holder 60 is located above the stator 40 with a gap. In addition, the bus bar holder 60 is positioned below the bearing holder 50 through a gap. That is, the bus bar holder 60 is positioned between the stator 40 and the bearing holder 50 without contacting the stator 40 and the bearing holder 50.
  • the bus bar holder 60 has a disk shape. As shown in FIG. 2, a central hole 60 c through which the shaft 31 passes is provided at the center of the bus bar holder 60. As shown in FIG. 3, the bus bar holder 60 is provided with a plurality of coil wire insertion holes 60d through which the coil wire 43a is inserted. The coil wire 43a is connected to the coil wire connection portion 71 of the bus bar 70 on the upper side of the bus bar holder 60 through the coil wire insertion hole 60d.
  • the bus bar holder 60 includes a main body portion 61 made of a resin material and a plate-like metal plate (metal piece) 65 made of a metal material.
  • the main body 61 is formed by insert molding by embedding a part of the metal plate 65. That is, the bus bar holder 60 is an insert molded product.
  • the metal plate 65 has a disk shape.
  • the main body 61 covers a surface of the metal plate 65 by exposing a part of the surface of the metal plate 65.
  • the metal plate 65 is partially embedded in the main body 61 and fixed.
  • the main body 61 and the metal plate 65 are fixed by insert molding.
  • the outer diameter of the metal plate 65 is the same as or slightly smaller than the inner diameter of the large-diameter portion 21b of the housing 20, and is larger than the inner diameter of the small-diameter portion 21c of the housing 20.
  • the metal plate 65 has an upper surface 65b and a lower surface 65c.
  • the metal plate 65 has an exposed portion 66 exposed from the main body portion 61.
  • the exposed portion 66 includes an outer end surface 65e facing the radially outer side of the metal plate 65 and a part of the upper surface 65b and the lower surface 65c in the vicinity of the outer end surface 65e.
  • the metal plate 65 is covered with the main body 61 except for the exposed portion 66.
  • a contact surface 66a that contacts the support surface 22 of the housing 20 is provided in the radially outermost region of the lower surface 65c. That is, the bus bar holder 60 is provided with a contact surface 66a facing downward.
  • the bus bar holder 60 is supported in direct contact with the housing 20 on the contact surface 66 a of the metal plate 65. Further, the bus bar holder 60 is not in contact with the stator 40 and the bearing holder 50. Therefore, the bus bar holder 60 can be positioned with respect to the housing 20 without depending on the dimensional accuracy of the stator 40 and the bearing holder 50. For this reason, the vertical position of the tip of the connection terminal 77 supported by the bus bar holder 60 can be positioned with high accuracy, and the electrical continuity with the external device 9 can be stabilized.
  • the contact surface 66a of the bus bar holder 60 with the housing 20 is made of a metal material, so that the dimensional accuracy and flatness of the contact surface 66a can be increased.
  • the vertical position accuracy of the bus bar holder 60 with respect to the housing 20 can be easily increased, and as a result, the vertical position accuracy of the tip of the connection terminal 77 can be increased.
  • the bus bar holder 60 since the bus bar holder 60 has the metal plate 65, the bus bar holder 60 is reinforced, and the load resistance in the vertical direction of the bus bar holder 60 is increased.
  • the load resistance of the bus bar holder 60 can be sufficiently increased with respect to the reaction force when the connection terminal 77 is inserted.
  • the bus bar holder 60 can sufficiently increase the strength of the contact surface 66a where stress is concentrated by configuring the contact surface 66a in contact with the housing 20 with the metal plate 65. That is, even when the area of the contact surface 66a is reduced, sufficient strength can be given to the bus bar holder 60. As a result, the area of the support surface 22 of the housing 20 in contact with the contact surface 66a can be reduced, and as a result, the radial dimension of the housing can be reduced.
  • the area of the portion where the metal plate 65 faces the main body 61 in the vertical direction is larger than the area of the portion where the contact surface 66a faces the support surface 22 in the vertical direction. That is, according to the present embodiment, a sufficient contact area between the metal plate 65 and the resin main body 61 is ensured. Therefore, stress is dispersed at the contact portion between the metal plate 65 and the main body 61, and excessive stress is prevented from being applied to the main body 61, and the load resistance of the bus bar holder 60 is increased.
  • the portion included in the upper surface 65b is located radially outside the contact surface 66a. That is, at least a part of the upper surface of the contact surface 66 a of the metal plate 65 is covered with the main body 61.
  • the contact surface 66 a receives stress as a reaction force from the housing 20.
  • a part of the main body 61 can support the contact surface 66a from the rear in the stress direction.
  • the metal plate 65 is located below the connection terminal 77 of the bus bar 70 through a part of the main body 61. That is, the metal plate 65 overlaps with the connection terminal 77 when viewed from the vertical direction. As described above, a downward external force is applied to the connection terminal 77 when it is inserted into the external device 9. According to the present embodiment, by disposing the metal plate 65 below the connection terminal 77, the metal plate 65 directly receives the reaction force at the time of insertion. For this reason, it is possible to increase the load resistance of the bus bar holder 60 against the reaction force when the connection terminal 77 is inserted.
  • the metal plate 65 is provided with a through hole 65a penetrating in the vertical direction.
  • the inner peripheral surface of the through hole 65 a is covered with the covering portion 61 c of the main body portion 61.
  • the inner peripheral surface of the covering portion 61c constitutes a coil wire insertion hole 60d through which the coil wire 43a passes.
  • the covering portion 61 c ensures insulation between the coil wire 43 a and the metal plate 65.
  • coated part 61c fulfill
  • the main body 61 of the bus bar holder 60 has an upper surface 61a facing upward. Upper surface 61 a is in contact with the lower surface of bus bar 70.
  • the bus bar holder 60 supports the bus bar 70 on the upper surface 61a. That is, the bus bar holder 60 supports the bus bar 70 (particularly the connection terminal 77) from below.
  • FIG. 4 is a cross-sectional view showing a support structure of the bus bar 70 by the main body 61.
  • a support protrusion 64 is provided on the upper surface 61 a of the main body 61.
  • the support protrusion 64 extends upward from the upper surface 61a.
  • the connecting portion 72 of the bus bar 70 is provided with a hole 72c penetrating in the vertical direction. The support protrusion 64 is inserted into the hole 72c.
  • the support protrusion 64 has a shaft portion 64b and a head portion 64a.
  • the shaft portion 64b extends upward from the upper surface 61a.
  • the head portion 64a is located at the upper end of the shaft portion 64b.
  • the head 64 a is located above the bus bar 70.
  • the diameter of the head portion 64a is larger than the diameter of the shaft portion 64b.
  • the head portion 64a is formed by heating the tip of the shaft portion 64b. An assembly worker or the like inserts the shaft portion 64b into the hole 72c of the bus bar 70 before the head portion 64a is formed, and heats the tip of the shaft portion 64b to form the head portion 64a.
  • the bus bar 70 is fixed by thermal welding by being pressed against the bus bar holder 60 in the process of heating. Therefore, the vertical positioning accuracy of the bus bar 70 with respect to the bus bar holder 60 can be increased.
  • the main body portion 61 of the bus bar holder 60 may be provided with an extending portion 162 extending along the vertical direction. That is, the bus bar holder 60 may have the extending portion 162.
  • the extending portion 162 is located at the radially outer end of the main body portion 61 and extends in an annular shape along the circumferential direction.
  • the extending portion 162 is located on the upper side of the metal plate 65.
  • the extending portion 162 faces the inner peripheral portion 21 of the housing 20 in the radial direction.
  • the extending portion 162 is in surface contact with the inner peripheral portion 21 of the housing 20. According to this configuration, the bus bar holder 60 can be positioned in the radial direction with respect to the housing 20 by the extending portion 162 contacting the inner peripheral portion 21 of the housing 20.
  • the extending portion 162 extends in the vertical direction, and the contact surface between the extending portion 162 and the inner peripheral portion 21 extends in the vertical direction, thereby suppressing the central axis of the bus bar holder 60 from being inclined with respect to the central axis of the housing 20. it can.
  • the extending portion 162 extends in an annular shape along the circumferential direction, but the extending portion may be a rib arranged along the circumferential direction. Further, in the present embodiment, the case where the extending portion 162 is located on the upper side of the metal plate 65 is illustrated, but the extension portion 162 may be located on the lower side of the metal plate 65. Furthermore, although the case where the extending portion 162 is a part of the main body portion 61 is illustrated in the present embodiment, the extending portion 162 may be a part of the metal plate 65.
  • the motor of this modification has a pair (two sheets) of substrates 107 and 108 and a press-fit terminal 106 that connects the substrates 107 and 108 to each other.
  • the pair of substrates 107 and 108 are located above the bus bar holder 60.
  • the pair of substrates 107 and 108 face each other with a gap in the vertical direction.
  • one of the substrates 108 located on the lower side of the pair of substrates 107 and 108 is supported by the bus bar holder 60.
  • the pair of substrates 107 and 108 are provided with openings 107a and 108a, respectively.
  • a press-fit terminal 106 is inserted into the openings 107 a and 108 a of the pair of substrates 107 and 108 by press-fitting. Thereby, the pair of substrates 107 and 108 are electrically connected to each other.
  • the bus bar holder 60 receives the stress related to the press-fitting of the press-fit terminal 106 that connects the pair of substrates 107 and 108. Since the bus bar holder 60 includes the metal plate 65, the load resistance is sufficiently increased against the stress associated with press fitting. Therefore, even when the press-fit terminal 106 is used, it is not necessary to increase the thickness of the bus bar holder 60, and as a result, the size of the motor 1 along the vertical direction can be reduced.
  • FIG. 5 is a schematic diagram illustrating the electric power steering apparatus 2 according to the embodiment.
  • the electric power steering device 2 is mounted on a steering mechanism of a vehicle wheel.
  • the electric power steering device 2 of the present embodiment is a rack type power steering device that directly reduces the steering force by the power of the motor 1.
  • the electric power steering device 2 includes a motor 1, a steering shaft 914, and an axle 913.
  • the steering shaft 914 transmits the input from the steering 911 to the axle 913 having the wheels 912.
  • the power of the motor 1 is transmitted to the axle 913 via a ball screw (not shown).
  • the motor 1 employed in the rack-type power steering apparatus 2 is attached to the axle 913 and exposed to the outside, and thus requires a waterproof structure.
  • the electric power steering apparatus 2 of the present embodiment includes the motor 1 described above, the electric power steering apparatus 2 that enjoys the effects of the motor 1 can be obtained.
  • the power steering apparatus 2 was mentioned as an example of the usage method of the motor 1 of this embodiment, the usage method of the motor 1 is not limited.
  • the case where the plate-shaped metal plate 65 is used has been described.
  • any metal plate 65 having a function equivalent to that of the metal plate 65 may be used, and a block-shaped metal piece may be used instead of the metal plate 65. It may be used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention concerne un moteur qui est pourvu : d'un rotor qui tourne autour d'un axe central s'étendant verticalement ; d'un stator qui comporte un fil de bobine et qui est positionné radialement vers l'extérieur du rotor ; d'une barre omnibus à laquelle le fil de bobine est connecté ; d'un support de barre omnibus qui est positionné sur le côté supérieur du stator et qui soutient la barre omnibus ; et d'un boîtier cylindrique qui entoure le stator et le support de barre omnibus à partir de la zone radialement extérieure, le support de barre omnibus comportant un corps qui est constitué d'un matériau en résine, et une pièce métallique qui est fixée au corps et qui est pourvue d'une surface de contact tournée vers le bas, et une surface de support tournée vers le haut et qui est en contact avec la surface de contact est disposée sur la partie circonférentielle interne du boîtier.
PCT/JP2018/002867 2017-02-28 2018-01-30 Moteur WO2018159188A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019502519A JP7024776B2 (ja) 2017-02-28 2018-01-30 モータ
CN201890000552.4U CN210578010U (zh) 2017-02-28 2018-01-30 马达

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017036365 2017-02-28
JP2017-036365 2017-02-28

Publications (1)

Publication Number Publication Date
WO2018159188A1 true WO2018159188A1 (fr) 2018-09-07

Family

ID=63370277

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/002867 WO2018159188A1 (fr) 2017-02-28 2018-01-30 Moteur

Country Status (3)

Country Link
JP (1) JP7024776B2 (fr)
CN (1) CN210578010U (fr)
WO (1) WO2018159188A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021200053A1 (fr) * 2020-03-31 2021-10-07 日本電産株式会社 Moteur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014138499A (ja) * 2013-01-17 2014-07-28 Nippon Densan Corp モータ
JP2016195504A (ja) * 2015-03-31 2016-11-17 日本電産株式会社 モータ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014138499A (ja) * 2013-01-17 2014-07-28 Nippon Densan Corp モータ
JP2016195504A (ja) * 2015-03-31 2016-11-17 日本電産株式会社 モータ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021200053A1 (fr) * 2020-03-31 2021-10-07 日本電産株式会社 Moteur

Also Published As

Publication number Publication date
JP7024776B2 (ja) 2022-02-24
CN210578010U (zh) 2020-05-19
JPWO2018159188A1 (ja) 2019-12-26

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