WO2014024288A1 - Moteur électrique - Google Patents

Moteur électrique Download PDF

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Publication number
WO2014024288A1
WO2014024288A1 PCT/JP2012/070325 JP2012070325W WO2014024288A1 WO 2014024288 A1 WO2014024288 A1 WO 2014024288A1 JP 2012070325 W JP2012070325 W JP 2012070325W WO 2014024288 A1 WO2014024288 A1 WO 2014024288A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
power distribution
stator
distribution plate
electric motor
Prior art date
Application number
PCT/JP2012/070325
Other languages
English (en)
Japanese (ja)
Inventor
弘文 土井
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2014529206A priority Critical patent/JP5885846B2/ja
Priority to CN201290001258.8U priority patent/CN204231076U/zh
Priority to PCT/JP2012/070325 priority patent/WO2014024288A1/fr
Publication of WO2014024288A1 publication Critical patent/WO2014024288A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/223—Heat bridges

Definitions

  • This invention relates to an electric motor having a structure for radiating heat generated by a stator coil and a power distribution board.
  • a general three-phase synchronous AC motor creates a magnetic pole in a rotor by a permanent magnet of a stator, and creates a magnetic pole in a stator tooth by a coil disposed between stator teeth of the stator. .
  • the energization direction of the three-phase coils arranged between the stator teeth is switched by a power distribution plate (bus bar), and is switched between the S pole and the N pole.
  • the temperature of the bearing that rotatably holds the rotor also rises during rotation due to self-heating due to heat transfer and friction, the temperature of the bearing can also be radiated to the housing to lower the temperature. Then it is important.
  • This invention was made in order to solve the above problems, and it aims at providing the electric motor which can suppress the temperature rise of a housing and can suppress degradation of components, such as a bearing by heat damage. .
  • An electric motor holds a coil that generates a magnetic field when energized, forms a magnetic path of the magnetic field generated by the coil, a rotor that rotates by a magnetic attraction repulsive force of the stator, and the center of the stator A bearing that rotatably holds the rotor part on the side, a power distribution plate that distributes power to the coil of the stator part according to the rotational position of the rotor part, and a housing that holds the stator part and the power distribution board side by side in the axial direction, The housing holds the stator portion on one surface, the bracket portion holding the power distribution plate on the opposite surface, the shaft hole formed in the center of the bracket portion to receive the bearing, and the outer peripheral side from the shaft hole of the bracket portion A coil through hole for passing the coil of the stator portion in the axial direction to the power distribution plate side, and the outer periphery of the shaft hole of the bracket portion. Those having an annular groove through.
  • the annular groove on the outer peripheral side from the shaft hole of the bracket portion it is possible to suppress heat transfer to the bearing by cutting the heat with this groove. Further, by forming a groove to partially reduce the thickness of the bracket portion, heat generation due to induction heating of the coil can be reduced, and an unnecessary increase in the temperature of the housing can be suppressed. Therefore, it is possible to provide an electric motor capable of suppressing deterioration of components such as a bearing due to heat damage.
  • FIG. 3 (a) is the top view seen from the power distribution board side
  • FIG.3 (b) is sectional drawing cut
  • FIG. 4A is a plan view seen from the power distribution plate side
  • FIG. 4B is a cross-sectional view cut along the line BB. It is sectional drawing explaining the positional relationship of the thin part in an electric motor which concerns on Embodiment 1, and a power distribution board.
  • FIG. 7A shows a structure of a housing of an electric motor according to Embodiment 2 of the present invention
  • FIG. 7A is a plan view seen from a power distribution board side
  • FIG. 7B is a cross-sectional view cut along a CC line. is there.
  • FIG. 8A is a plan view of the electric motor according to the second embodiment
  • FIG. 8A is a plan view seen from the power distribution plate side
  • FIG. 8B is a cross-sectional view cut along the line EE.
  • It is the top view seen from the power distribution board side which shows the housing modification of the electric motor which concerns on Embodiment 2.
  • FIG. 7A shows a structure of a housing of an electric motor according to Embodiment 2 of the present invention
  • FIG. 7A is a plan view seen from a power distribution board side
  • FIG. 7B is a cross-sectional view cut along a CC line. is there.
  • FIG. 8A is a plan view of the electric motor according to the second embodiment
  • FIG. 1 An electric motor 1 shown in FIG. 1 constitutes a three-phase AC synchronous motor, and mainly includes a cylindrical housing 2, a stator portion 3 fixed inside the housing 2, and a rotor portion 5 that rotates a shaft 4. And a power distribution plate (bus bar) 14 disposed on one end face side of the stator portion 3.
  • FIG. 2 the top view of the stator part 3 and the rotor part 5 seen from the power distribution board 14 side is shown. However, the housing 2 and the coil 12 are not shown.
  • the rotor part 5 is configured by laminating electromagnetic steel plates, and is formed with two protrusions protruding outward in the circumferential direction at intervals of 180 degrees, and the protrusions are shifted by 90 degrees in the axial direction of the shaft 4. (Protrusions 5a, 5b).
  • the shaft 4 is rotatably supported by bearings 7 and 8 fixed to the housing 2.
  • the rotor part 5 is fixed to the shaft 4, and the rotational force generated in the rotor part 5 is externally output by rotating the shaft 4 integrally with the rotor part 5.
  • the stator unit 3 includes two stator cores 9 and 10 and a magnet 11 disposed between the stator cores 9 and 10.
  • the stator cores 9 and 10 are configured by laminating electromagnetic steel plates in the axial direction of the shaft 4.
  • Each of the stator cores 9 and 10 is formed with a plurality of teeth 9a and 10a protruding from the outside toward the central shaft 4 side, and one U-shaped pair of teeth 9a and 10a overlapping in the axial direction of the shaft 4 is formed.
  • the coil 12 is attached.
  • the stator portion 3 is press-fitted from the opening end portion of the housing 2 and is sandwiched between a cover 19 that closes the opening end portion and a bracket portion 20 (details will be described later) protruding from the inner peripheral surface of the housing 2. It is fixed in the state.
  • each coil 12 mounted on each tooth 9a, 10a passes through a coil through hole 22 formed in the bracket portion 20 of the housing 2 and a through hole (not shown) formed in the insulating member 6. It protrudes to the inverter board 13 side, and this protruding portion is connected to the power distribution plate 14 (U phase, V phase, W phase) by welding or the like.
  • the power distribution plate 14 is a conductive member that is integrally formed with the insulating member 6 such as an insulating resin and is insulated from the metal housing 2 such as aluminum, and is arranged in an annular shape along the circumferential direction of the shaft 4 and has one end portion. The other end of the inverter board 13 is connected to the coil 12.
  • the insulating member 6 including the power distribution plate 14 is press-fitted from the opening end portion of the housing 2 (the side opposite to the press-fitting side of the stator portion 3), and is attached to the cover housing 17 and the bracket portion 20 attached to the opening end portion. It is fixed in a clamped state.
  • the inverter board 13 converts an external power source (not shown) into an alternating current, and sequentially switches the U phase, V phase, and W phase of the power distribution plate 14 based on the position signal input from the sensor 15 to the power distribution plate. Current is passed through 14.
  • the inverter board 13 is attached to the inside of the cover housing 17 and is covered with a cover 18.
  • the sensor 15 is installed in the inner circumferential space of the insulating member 6, detects the rotational position of the shaft 4 by detecting the position of the sensor target 16 that rotates integrally with the shaft 4, and sends a position signal to the inverter board 13. Output.
  • the magnetic flux generated by the magnet 11 magnetized in the axial direction flows out from the teeth 9a of the stator core 9 arranged on the N-pole side of the magnet 11 to the protrusion 5a of the rotor portion 5, and advances through the rotor portion 5 in the axial direction. It becomes a field magnetic flux that comes out of the protruding portion 5 b on the pole side and flows into the teeth 10 a of the stator core 10 disposed on the S pole side of the rotor portion 5.
  • the magnetic field magnetomotive force of the magnet 11 acts on the rotor portion 5, so that the protrusion 5 a of the rotor portion 5 facing the N pole side of the magnet 11 is magnetized to the N pole, and the S pole of the magnet 11.
  • the protrusion 5b of the rotor part 5 facing the side is magnetized to the S pole.
  • FIG. 3A is a plan view of the housing 2 viewed from the power distribution plate 14 side, and FIG. It is sectional drawing cut
  • a shaft hole 21 is formed in the center of the bracket portion 20 and the bearing 8 is installed.
  • the coil through-hole 22 which the coil 12 penetrates in the bracket part 20 is formed for the number of terminals of the coil 12, and the coil 12 is penetrated from the stator part 3 side to the power distribution board 14 side.
  • annular groove 23 is formed on the surface of the bracket portion 20 facing the power distribution plate 14 so as to pass through the coil through hole 22.
  • annular groove 24 is formed on the surface of the bracket portion 20 facing the stator portion 3 so as to pass through the coil through hole 22.
  • FIG. 4 shows a housing 102 having a conventional structure in which the thin portion 25 is not formed.
  • 4A is a plan view of the housing 102 viewed from the power distribution plate 14 side
  • FIG. 4B is a cross-sectional view of the housing 102 cut along the line BB.
  • the bracket part 20 of the housings 2 and 102 must be penetrated, and the bracket part 20 has a coil through hole 22. Must be formed and passed through the coil 12. Therefore, heat generated by the coil 12 due to the current flowing is transmitted to the bracket portion 20 and the housings 2 and 102 (arrow H1 in FIGS. 3B and 4B).
  • the distance between the inner wall surface of the coil through hole 22 and the coil 12, and the distribution board 14 and the bracket part 20 must be as close as possible.
  • annular grooves 23 and 24 that pass through the coil through holes 22 are provided on the outer peripheral side of the shaft hole 21 of the bracket portion 20, so that the thin portion 25 is provided. Form and reduce the portion that generates heat by induction heating. As a result, at least heat generation by induction heating of the coil 12 can be reduced, and an unnecessary temperature rise of the bracket portion 20 and the housing 2 can be suppressed. Therefore, heat transfer to the bearing 8 (arrow H2 in FIG. 3B) can be suppressed, and the bearing 8 can be prevented from being unnecessarily heated, and self-heating due to friction of the bearing 8 can be prevented from the bracket portion. 20 and the housing 2 can be radiated to lower the temperature. Further, by forming the grooves 23 and 24, heat transfer from the bracket portion 20 to the bearing 8 can be cut off. Therefore, deterioration of the bearing 8 due to heat damage can be suppressed.
  • FIG. 5 is a cross-sectional view illustrating the positional relationship between the thin portion 25 and the power distribution plate 14 in the electric motor 1 according to the first embodiment.
  • the stator portion 3, the coil 12, etc. are omitted.
  • the power distribution plate 14 is brought into contact with one side of the bracket portion 20 via the insulating member 6, and heat generated by the power distribution plate 14 due to current flowing is transmitted to the bracket portion 20 and the housing 2 to dissipate heat, thereby increasing the temperature. Suppressed.
  • the power distribution plate 14 by disposing the power distribution plate 14 on the outer peripheral side of the annular groove 23 of the bracket portion 20 via the insulating member 6, an air layer is formed by the groove 23 to be heat-cut, Suppresses heat transfer.
  • the heat generated by the power distribution plate 14 is transmitted from the contact surface 26 between the power distribution plate 14 and the bracket portion 20 to the bearing 8 through the thin portion 25, and a heat dissipation path indicated by an arrow H3 is formed. Therefore, it is possible to prevent the bearing 8 from being heated unnecessarily.
  • the annular grooves 23 and 24 are formed on both surfaces of the bracket portion 20, but either one may be used. Since the temperature of the insulating member 6 is higher than that of the stator portion 3, it is desirable to form the groove 23 at least on the power distribution plate 14 side. Furthermore, the groove 23 may be deepened so that heat transfer from the power distribution plate 14 to the bearing 8 can be further suppressed. An example of this configuration is shown in FIG.
  • FIG. 6 is a cross-sectional view for explaining a modification of the bracket portion 20 in the electric motor 1 according to the first embodiment.
  • the stator portion 3, the coil 12, etc. are omitted.
  • a deep groove 23 is formed on the surface of the bracket portion 20 facing the power distribution plate 14 to increase the axial distance from the power distribution plate 14 to the thin portion 25. Therefore, the heat dissipation path indicated by the arrow H3 in FIG. 6 is extended from the heat dissipation path indicated by the arrow H3 in FIG. 5, and heat dissipation from the outer peripheral surface of the bracket portion 20 and the housing 2 increases, and from the power distribution plate 14 to the bearing 8. It is possible to further suppress the heat transfer.
  • a heat radiating member such as a heat sink may be installed on the outer peripheral surface of the housing 2 to enhance the heat radiating effect.
  • the electric motor 1 holds the coil 12 that generates a magnetic field by energization, and forms the magnetic path of the magnetic field generated by the coil 12 and the magnetic attraction of the stator unit 3.
  • the rotor portion 5 that rotates by the repulsive force
  • the bearing 8 that rotatably holds the shaft 4 fixed to the rotor portion 5 on the center side of the stator portion 3, and the rotation of the rotor portion 5 to the coil 12 of the stator portion 3.
  • a power distribution plate 14 that distributes power in accordance with the position; and a housing 2 that holds the stator portion 3 and the power distribution plate 14 side by side in the axial direction.
  • the housing 2 holds the stator portion 3 on one side
  • the bracket portion 20 that holds the power distribution plate 14 on the surface
  • the shaft hole 21 that is formed at the center of the bracket portion 20 and accommodates the bearing 8, and is formed on the outer peripheral side from the shaft hole 21 of the bracket portion 20.
  • a coil through hole 22 that allows the coil 12 of the portion 3 to pass through in the axial direction to the power distribution plate 14 side, and an annular shape that is formed on the outer peripheral side of the shaft hole 21 of the bracket portion 20 over the entire circumference and passes through the coil through hole 22.
  • the grooves 23 and 24 are configured. For this reason, heat transfer to the bearing 8 can be suppressed by cutting the heat with the annular grooves 23 and 24 on the outer peripheral side of the bearing 8 of the bracket portion 20.
  • annular groove 23 is formed on the surface of the bracket portion 20 that holds the power distribution plate 14, the heat generated by the power distribution plate 14 is cut off by the groove 23 and the power distribution is performed. Heat transfer from the plate 14 to the bearing 8 can be suppressed.
  • the power distribution plate 14 is brought into contact with the outer peripheral side of the annular groove 23 of the bracket portion 20 via the insulating member 6.
  • a heat dissipation path is formed from the contact surface 26 to the bearing 8 through the outer peripheral side of the bracket portion 20 and the thin portion 25. For this reason, the heat generated by the power distribution plate 14 can be efficiently radiated by the bracket portion 20 and the housing 2.
  • FIG. FIG. 7 shows the configuration of the housing 2 in the electric motor 1 according to the second embodiment.
  • FIG. 7A is a plan view of the housing 2 viewed from the power distribution board 14 side, and FIG. It is sectional drawing which cut
  • FIG. 1 is used below.
  • a plurality of ribs 30 are installed in the groove 23 to improve the strength of the bracket portion 20. Further, by reducing the thickness of the rib 30, the temperature rise of the rib 30 due to induction heating is suppressed, and the bearing 8 is prevented from being heated unnecessarily. Further, the end surface of the rib 30 is made one step lower than the contact surface 26 with the insulating member 6, and a gap D 3 is opened between the rib 30 and the insulating member 6. Thereby, the heat generated by the power distribution plate 14 is prevented from being transmitted to the bearings 8 via the ribs 30.
  • the ribs 30 can be installed even when the grooves 23 and 24 are formed on both surfaces of the bracket portion 20.
  • FIG. 8A shows a plan view of the housing 2 viewed from the power distribution plate 14 side
  • FIG. 8B shows a cross-sectional view of the housing 2 cut along the line EE.
  • the ribs 30 are formed by forming the grooves 23 on the surface of the bracket portion 20 facing the power distribution plate 14, and the ribs 24 are formed by forming the grooves 24 on the surface of the bracket portion 20 facing the stator portion 3. Install. Thereby, the intensity
  • a gap D3 is formed between the rib 30 and the insulating member 6 to prevent heat transfer from the power distribution plate 14. It is also possible to form a gap between the rib 31 and the stator part 3 to prevent heat transfer from the stator part 3. It is also possible to install only one of the ribs 30 and 31.
  • the ribs 30 and 31 be an integral multiple of the number of coils 12, that is, an integral multiple of the number of poles of the stator portion 3, and be arranged uniformly in a circumferential shape.
  • the ribs 30 and 31 are equally arranged at 6 locations as an integral multiple of the teeth 9a and 10a so ing.
  • the ribs 30 may be installed at twice the number of poles, that is, at 12 locations.
  • the electric motor 1 is configured to install the ribs 30 and 31 in the annular grooves 23 and 24, the bracket portion 20 while maintaining the heat cutting effect of the grooves 23 and 24.
  • the strength of can be improved.
  • the induction heating is not increased by making the ribs 30 and 31 thinner.
  • the end surface of the rib 30 is made lower than the surface of the bracket portion 20 that holds the power distribution plate 14, so that heat transfer from the power distribution plate 14 to the bearing 8 through the rib 30 is performed. Can be prevented.
  • the end surface of the rib 31 is made lower than the surface that holds the stator portion 3 of the bracket portion 20, heat transfer from the stator portion 3 to the bearing 8 through the rib 30 can be prevented.
  • the ribs 30 and 31 since the number of ribs 30 and 31 is set to be an integral multiple of the number of poles of the stator portion 3, the ribs 30 and 31 can be installed so as to have a uniform stress distribution in a circumferential shape.
  • the strength of the bracket part 20 can be improved.
  • the bracket portion of the housing has a shape that can reduce heat generation by induction heating while considering heat cutting and heat dissipation, so that a turbine such as an electric compressor and an electric assist turbo can be operated at high speed. It is suitable for use in an electric motor that is driven by rotation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Selon l'invention, la transmission de chaleur vers un palier (8) est inhibée, en arrêtant la chaleur, par formation côté périphérique externe d'un trou d'axe (21) admettant le pallier (8) d'une partie chaise (20), de rainures (23, 24) de forme circulaire traversant un trou traversant de bobine (22) laissant traverser une bobine (12) d'une partie stator (3) vers un côté plaque de distribution d'électricité (14). Enfin, un bord périphérique de la bobine (12) de la partie chaise (20), constitue une partie mince (25), et une chaleur générée du fait d'un chauffage par induction de la bobine (12), est abaissée.
PCT/JP2012/070325 2012-08-09 2012-08-09 Moteur électrique WO2014024288A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2014529206A JP5885846B2 (ja) 2012-08-09 2012-08-09 電動機
CN201290001258.8U CN204231076U (zh) 2012-08-09 2012-08-09 电动机
PCT/JP2012/070325 WO2014024288A1 (fr) 2012-08-09 2012-08-09 Moteur électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/070325 WO2014024288A1 (fr) 2012-08-09 2012-08-09 Moteur électrique

Publications (1)

Publication Number Publication Date
WO2014024288A1 true WO2014024288A1 (fr) 2014-02-13

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ID=50067569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/070325 WO2014024288A1 (fr) 2012-08-09 2012-08-09 Moteur électrique

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Country Link
JP (1) JP5885846B2 (fr)
CN (1) CN204231076U (fr)
WO (1) WO2014024288A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016195504A (ja) * 2015-03-31 2016-11-17 日本電産株式会社 モータ
EP3168965A1 (fr) * 2015-11-16 2017-05-17 Kabushiki Kaisha Toyota Jidoshokki Compresseur d'alimentation électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6713208B2 (ja) * 2016-05-17 2020-06-24 株式会社ハーモニック・ドライブ・システムズ モータ内蔵型波動歯車装置
DE102020124216A1 (de) * 2020-09-17 2022-03-17 Schaeffler Technologies AG & Co. KG Gehäuse mit einem Hitzeschild für einen Elektromotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01113551U (fr) * 1988-01-22 1989-07-31
JP2004096855A (ja) * 2002-08-30 2004-03-25 Yaskawa Electric Corp 回転電機
JP2006060976A (ja) * 2004-08-23 2006-03-02 Nidec Shibaura Corp モータ
JP2008163849A (ja) * 2006-12-28 2008-07-17 Hitachi Ltd スクロール式流体機械

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5375652U (fr) * 1976-11-29 1978-06-23
JP4374507B2 (ja) * 1999-06-15 2009-12-02 アイシン精機株式会社 電動機
EP1994629A1 (fr) * 2006-02-22 2008-11-26 Magnetic Applications Inc. Alternateur compact de forte puissance
JP4931742B2 (ja) * 2007-09-05 2012-05-16 三菱電機株式会社 回転機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01113551U (fr) * 1988-01-22 1989-07-31
JP2004096855A (ja) * 2002-08-30 2004-03-25 Yaskawa Electric Corp 回転電機
JP2006060976A (ja) * 2004-08-23 2006-03-02 Nidec Shibaura Corp モータ
JP2008163849A (ja) * 2006-12-28 2008-07-17 Hitachi Ltd スクロール式流体機械

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016195504A (ja) * 2015-03-31 2016-11-17 日本電産株式会社 モータ
EP3168965A1 (fr) * 2015-11-16 2017-05-17 Kabushiki Kaisha Toyota Jidoshokki Compresseur d'alimentation électrique
US10415572B2 (en) 2015-11-16 2019-09-17 Kabushiki Kaisha Toyota Jidoshokki Electric supercharger

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Publication number Publication date
JP5885846B2 (ja) 2016-03-16
JPWO2014024288A1 (ja) 2016-07-21
CN204231076U (zh) 2015-03-25

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