WO2022195920A1 - 回転電機 - Google Patents

回転電機 Download PDF

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Publication number
WO2022195920A1
WO2022195920A1 PCT/JP2021/031875 JP2021031875W WO2022195920A1 WO 2022195920 A1 WO2022195920 A1 WO 2022195920A1 JP 2021031875 W JP2021031875 W JP 2021031875W WO 2022195920 A1 WO2022195920 A1 WO 2022195920A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
hole
flow path
housing
coolant
Prior art date
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.)
Ceased
Application number
PCT/JP2021/031875
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
英明 後藤
隆樹 板谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Astemo Ltd
Original Assignee
Hitachi Astemo Ltd
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 Hitachi Astemo Ltd filed Critical Hitachi Astemo Ltd
Priority to JP2023506716A priority Critical patent/JPWO2022195920A1/ja
Publication of WO2022195920A1 publication Critical patent/WO2022195920A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium

Definitions

  • the present invention relates to rotating electric machines.
  • a stator core is known that can achieve high cooling performance in a small space while suppressing performance deterioration of rotating electric machines (see Patent Document 1, for example).
  • An object of the present invention is to provide a rotating electric machine capable of reducing noise from the housing caused by electromagnetic excitation forces generated in the teeth.
  • a rotating electric machine of the present invention includes a stator and a housing that houses the stator, the stator includes teeth around which coils are wound, stator cores that hold the teeth, a fixing portion formed radially outside the stator core and fixed to the housing; and a through hole formed along the axial direction and provided at a position where the fixing portion and the teeth overlap when viewed in the radial direction. , provided.
  • FIG. 1 is a perspective view of a motor according to an embodiment of the invention
  • FIG. 1 is a cross-sectional view of a motor according to an embodiment of the invention
  • FIG. FIG. 3 is a perspective view of the stator shown in FIG. 2
  • FIG. 3 is an explanatory view (radial cross section) of the action of the through hole shown in FIG. 2
  • 3 is an explanatory diagram (axial cross section) of the function of the through hole shown in FIG. 2
  • FIG. FIG. 10 is a cross-sectional view showing Modification 1 of the through hole
  • 5B illustrates the effect of the through holes shown in FIG. 5A
  • FIG. It is a sectional view showing modification 2 of a penetration hole. 6B illustrates the effect of the through holes shown in FIG. 6A
  • FIG. 6B illustrates the effect of the through holes shown in FIG. 6A
  • FIG. 6B illustrates the effect of the through holes shown in FIG. 6A
  • FIG. 6B illustrates the effect of the through holes shown in FIG.
  • FIG. 4 is a partial cross-sectional view of the periphery of a coolant inlet having one opening;
  • FIG. 4 is a partial cross-sectional view of the periphery of a coolant inlet having two openings;
  • FIG. 3 is a cross-sectional view showing coolant flow paths provided inside the shaft and the rotor;
  • the motor 100 mainly consists of a stator 10, a rotor 20 and a housing 30. As shown in FIG. A shaft 27 is attached to the rotor 20 .
  • the motor 100 includes a stator 10 having a coil 14 and a core portion (stator core 11), a housing 30 containing the stator 10, and a rotating shaft (shaft 27) connected to the housing 30. a bearing 31;
  • the stator 10 includes a through hole 15 extending along the rotation axis (shaft 27), and a fixing portion 12 that fixes the core portion (stator core 11) to the housing 30 and is formed radially outward.
  • the stator 10 has teeth (teeth 13) formed radially inward.
  • the through-hole 15 is formed at a position overlapping the fixed portion 12 and the tooth portion (teeth 13) when viewed from the radial direction.
  • the fixing portion 12 is formed as an ear portion radially protruding from the outer surface of the core portion (the stator core 11).
  • the axial through-hole (through-hole 15) is formed so as to overlap the entire ear portion when viewed from the radial direction.
  • the low-rigidity region of the stator core provided with the through holes can increase the damping ratio on the path through which the electromagnetic excitation force generated in the stator is transmitted to the housing. It is possible to reduce the noise generated from
  • axial through-holes are provided on the inner diameter side of the fixing portion 12 (ear portion), which is the core back portion of the stator core 11 . Due to the difference in hole shape (rigidity), specific frequency components can be reduced as shown below.
  • the stator 10 is fixed to the housing 30 via the fixing portion 12 .
  • the coil 14 When the coil 14 is energized, an electromagnetic excitation force is generated in the teeth (teeth 13).
  • a through hole 15 is provided on the transmission path through which the electromagnetic excitation force is transmitted to the housing 30 .
  • the through holes 15 reduce the stiffness of the transmission path and increase the damping ratio so that the equivalent radiated power level at the surface of the housing 30 can be reduced.
  • k spring constant
  • m mass
  • SQRT denotes a function that returns the square root of its argument.
  • the electromagnetic excitation force generated in the teeth (teeth 13) of the stator 10 is transmitted from the stator core 11 to the housing 30 via bolts, fixing surfaces, etc., and radiated from the surface of the housing 30 as noise.
  • the axial through-hole 15 is provided in the core-back portion in the middle of the transmission path from the teeth 13 to the housing 30 to provide a low-rigidity region on the transmission path, thereby increasing the damping ratio. .
  • noise generated on the surface of the housing 30 can be reduced.
  • the cooling performance is improved by providing axial through holes (through holes 15) along the entire periphery of the core-back outer peripheral portion. Further, by providing the through holes 15 around the entire periphery, the overall radiation power level is further reduced.
  • the motor 100 (rotating electrical machine) includes at least a stator 10 and a housing 30 that accommodates the stator 10 .
  • the stator 10 includes teeth 13 , stator cores 11 , fixed portions 12 and through holes 15 .
  • Coils 14 are wound around the teeth 13 .
  • Stator core 11 holds teeth 13 .
  • the fixed portion 12 is formed radially outside the stator core 11 and fixed to the housing 30 with a fixing member such as a bolt.
  • the through-holes 15 are formed along the axial direction and provided at positions overlapping the fixed portion 12 and the teeth 13 when viewed in the radial direction. Accordingly, noise from the housing 30 caused by the electromagnetic excitation force generated in the teeth 13 can be reduced.
  • a plurality of through holes 15 shown in FIG. 3 are provided along the entire circumference of the stator core 11 . Although it is not essential to flow an insulating coolant such as oil through the through holes 15, when the coolant is caused to flow through the through holes 15 provided along the entire circumference, the stator 10 can be uniformly cooled in the circumferential direction. .
  • FIG. 5A (Modification 1 of through-hole)
  • one through-hole 15 is provided for each fixed portion 12 and covers the radially outer side of a plurality of teeth 13 adjacent to the fixed portion 12 .
  • the through hole 15 has a rectangular cross section in the axial direction and extends over the plurality of teeth 13 .
  • FIG. 5B the equivalent radiation power level on the low frequency side can be reduced.
  • Modification 2 of through hole In the example of FIG. 6A , a plurality of through holes 15 are provided for each fixing portion 12 .
  • the plurality of through holes 15 cover the radially outer sides of the plurality of teeth 13 adjacent to the fixing portion 12 . Thereby, as shown in FIG. 6B, the equivalent radiation power level on the high frequency side can be reduced.
  • the housing 30 has a groove forming portion 34 forming a tubular circumferential groove 34A through which the coolant flows.
  • the groove forming portion 34 is formed toward the coil end face (the end face 11A in FIG. 2) of the stator 10 and connected to the coil end face to form the axial through hole (the through hole 15) and the circumferential groove 34A. connect.
  • the circumferential groove 34A is provided as a groove that opens toward the stator 10 in the stator fixing portion (groove forming portion 34) of the housing 30.
  • the axial through hole (through hole 15) is provided in the stator core 11 as a hole penetrating in the axial direction.
  • the circumferential groove 34A is formed in the groove forming portion 34 in a cylindrical shape with an opening on the stator 10 side so as to communicate with all the axial through holes (through holes 15).
  • the housing 30 is connected to the through hole 15 of the stator 10 and has a cylindrical groove (circumferential groove 34A) through which the coolant flows. Thereby, the stator 10 can be cooled.
  • the housing 30 includes a coolant inlet 35 having two or more openings 35A that supply coolant to the groove (circumferential groove 34A).
  • the flow velocity in the circumferential groove 34A becomes constant, and the flow rate to the axial through hole (through hole 15) is increased. Since the inflow amount of the coolant becomes uniform, the temperature gradient within the stator 10 is alleviated.
  • the coolant inlet 35 has a function of communicating the circumferential groove 34A provided in the housing 30 with a coolant cooling device (not shown) that cools the coolant.
  • the coolant inlet 35 shown in FIG. 9B has two or more openings 35A (communicating portions) to the circumferential groove 34A, and has one communicating path with the coolant cooling device.
  • the motor 100 includes a shaft 27 having a first flow path (flow path 29) through which coolant flows, and a rotor 20 having a second flow path (flow path 22).
  • the second flow path (flow path 22) of the rotor 20 is connected to the first flow path (flow path 29) of the shaft 27, and supplies coolant to the coil 14 on the groove (circumferential groove 34A) side.
  • the motor 100 includes a first end ring (end ring 23) and a second end ring (end ring 24).
  • the first end ring (end ring 23) is provided on one end face of the rotor 20 and connects the first flow path (flow path 29) of the shaft 27 and the second flow path (flow path 22) of the rotor 20. It has a third channel (channel 25).
  • the second end ring (end ring 24) is provided on the other end surface of the rotor 20 and directs the coolant from the second flow path (flow path 22) of the rotor 20 to the coil 14 on the side of the groove (circumferential groove 34A). It has a fourth flow path (flow path 26) for guiding.
  • the refrigerant cannot be supplied to the coil end on the side of the circumferential groove 34A. Therefore, when the coolant is supplied to the rotor 20, by adopting a structure in which the coolant is supplied from the anti-circumferential groove side to the circumferential groove side, the coolant that has cooled the rotor 20 is discharged to the circumferential groove side. Thus, the coolant discharged from the rotor 20 is used to cool the coil ends on the circumferential groove side. The temperature gradient can be reduced by cooling both coil ends with a coolant.
  • the noise from the housing 30 caused by the electromagnetic excitation force generated in the teeth 13 can be reduced. Also, the cooling performance of the motor 100 can be improved.
  • the configuration of the above embodiment can be applied to various motors such as PM (Permanent Magnet) motors and induction motors.
  • PM Permanent Magnet
  • the embodiment of the present invention may be the following aspects.
  • a stator 10 having a coil 14 and a core portion (stator core 11), a housing 30 that houses the stator 10, and a bearing 31 that is connected to the housing 30 and supports a rotating shaft (shaft 27).
  • Reference numeral 10 denotes a through hole 15 extending along the rotation axis (shaft 27), a fixing portion 12 that fixes the core portion (stator core 11) to the housing 30 and is formed radially outward, and a tooth portion (teeth 13) formed inside the through hole 15 is formed at a position overlapping the fixing portion 12 and the tooth portion (teeth 13) when viewed from the radial direction. rotating electric machine.
  • the housing 30 has a groove forming portion 34 forming a (cylindrical) circumferential groove 34A through which a coolant flows.
  • the axial through-hole (through-hole 15) and the circumferential groove 34A are connected by connecting to the coil end end face.
  • a coolant inlet 35 for supplying coolant to a circumferential groove 34A provided in a stator fixing surface 33 of the housing 30 is provided in the housing 30. As shown in FIG. Two or more openings 35A may be provided for the circumferential grooves 34A of the coolant inlet 35 .
  • the coolant supplied to the circumferential groove 34A passes through the axial through-hole (through-hole 15) and is supplied to the coil end portion on the side opposite to the fixed surface.
  • the coolant supplied to flow path 29 provided in shaft 27 is supplied to flow path 22 in rotor core 21 through flow path 25 provided in the rotor end ring (end ring 23).
  • the coolant discharged from the rotor 20 is supplied to the coil ends on the circumferential groove 34A side.
  • (1)-(4) make it difficult for the electromagnetic excitation force generated in the stator to be transmitted to the housing, thereby reducing the equivalent radiation power level on the surface of the housing and improving noise.
  • any frequency component can be reduced, and the tone can be adjusted by reducing the maximum NV value or reducing a specific frequency component.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
PCT/JP2021/031875 2021-03-18 2021-08-31 回転電機 Ceased WO2022195920A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2023506716A JPWO2022195920A1 (https=) 2021-03-18 2021-08-31

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-044351 2021-03-18
JP2021044351 2021-03-18

Publications (1)

Publication Number Publication Date
WO2022195920A1 true WO2022195920A1 (ja) 2022-09-22

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PCT/JP2021/031875 Ceased WO2022195920A1 (ja) 2021-03-18 2021-08-31 回転電機

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WO (1) WO2022195920A1 (https=)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0617345U (ja) * 1992-07-22 1994-03-04 東洋電機製造株式会社 フレーム無しの交流機の固定子
JPH0636333U (ja) * 1992-10-06 1994-05-13 株式会社明電舎 回転電機の固定子鉄心
JP2019009967A (ja) * 2017-06-28 2019-01-17 本田技研工業株式会社 回転電機のステータ
JP2019154146A (ja) * 2018-03-02 2019-09-12 本田技研工業株式会社 回転電機
JP2019187063A (ja) * 2018-04-09 2019-10-24 日産自動車株式会社 回転電機
JP2019193320A (ja) * 2018-04-18 2019-10-31 株式会社デンソー 回転電機
JP2020022232A (ja) * 2018-07-30 2020-02-06 本田技研工業株式会社 ステータコアの内部冷却構造
JP2020114085A (ja) * 2019-01-10 2020-07-27 トヨタ紡織株式会社 ステータコアおよび回転電機の冷却構造
JP2020184850A (ja) * 2019-05-09 2020-11-12 株式会社明電舎 回転電機のステータのコイル冷却器具

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6129010B2 (ja) * 2013-07-24 2017-05-17 日立建機株式会社 発電電動機およびこれを用いた電動車両

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0617345U (ja) * 1992-07-22 1994-03-04 東洋電機製造株式会社 フレーム無しの交流機の固定子
JPH0636333U (ja) * 1992-10-06 1994-05-13 株式会社明電舎 回転電機の固定子鉄心
JP2019009967A (ja) * 2017-06-28 2019-01-17 本田技研工業株式会社 回転電機のステータ
JP2019154146A (ja) * 2018-03-02 2019-09-12 本田技研工業株式会社 回転電機
JP2019187063A (ja) * 2018-04-09 2019-10-24 日産自動車株式会社 回転電機
JP2019193320A (ja) * 2018-04-18 2019-10-31 株式会社デンソー 回転電機
JP2020022232A (ja) * 2018-07-30 2020-02-06 本田技研工業株式会社 ステータコアの内部冷却構造
JP2020114085A (ja) * 2019-01-10 2020-07-27 トヨタ紡織株式会社 ステータコアおよび回転電機の冷却構造
JP2020184850A (ja) * 2019-05-09 2020-11-12 株式会社明電舎 回転電機のステータのコイル冷却器具

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