WO2023108414A1 - Rotor de moteur et moteur - Google Patents

Rotor de moteur et moteur Download PDF

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Publication number
WO2023108414A1
WO2023108414A1 PCT/CN2021/137884 CN2021137884W WO2023108414A1 WO 2023108414 A1 WO2023108414 A1 WO 2023108414A1 CN 2021137884 W CN2021137884 W CN 2021137884W WO 2023108414 A1 WO2023108414 A1 WO 2023108414A1
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WO
WIPO (PCT)
Prior art keywords
cooling
rotor
cooling channel
hole
motor rotor
Prior art date
Application number
PCT/CN2021/137884
Other languages
English (en)
Chinese (zh)
Inventor
刘磊
欧阳鹏
宋志强
Original Assignee
舍弗勒技术股份两合公司
刘磊
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 舍弗勒技术股份两合公司, 刘磊 filed Critical 舍弗勒技术股份两合公司
Priority to PCT/CN2021/137884 priority Critical patent/WO2023108414A1/fr
Publication of WO2023108414A1 publication Critical patent/WO2023108414A1/fr

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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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating 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
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the invention relates to the field of motors, in particular to a motor rotor and a motor.
  • the motor can be used as the power device of pure electric vehicles or hybrid vehicles.
  • the cooling oil as the cooling medium is pumped into the hollow rotor shaft through the pump, and the cooling oil passes through the oil hole on the rotor shaft. Outflow to the balance plate and stator windings to cool the motor.
  • the cooling oil can directly contact the rotor shaft and the balance plate, but it is difficult for the cooling oil to contact the rotor body, and the heat of the rotor body can only be taken away indirectly through the rotor shaft and the balance plate, so the cooling effect is limited.
  • the purpose of the present invention is to overcome or at least alleviate the shortcomings of the above-mentioned prior art, and to provide a motor rotor and a motor with better cooling effect.
  • the invention provides a motor rotor, comprising:
  • a rotor shaft provided with a central hole through which a cooling medium passes
  • a rotor main body the rotor main body is connected to the rotor shaft in a torsion-resistant manner, a first cooling flow channel and a second cooling flow channel are formed inside the rotor main body, and the first cooling flow channel and the second cooling flow channel
  • the flow passage extends along the axial direction of the motor rotor as a whole, and the upstream side of the first cooling flow passage and the upstream side of the second cooling flow passage communicate with the central hole,
  • the upstream side of the first cooling channel and the downstream side of the second cooling channel are located on the same side in the axial direction of the motor rotor, and the downstream side of the first cooling channel is connected to the second cooling channel.
  • the upstream sides of the two cooling channels are located on the same axial side of the motor rotor, so that the cooling medium flows in opposite directions in the first cooling channel and the second cooling channel.
  • first cooling channels and the second cooling channels there are multiple first cooling channels and the second cooling channels, and the first cooling channel and the second cooling channel are arranged around the periphery of the motor rotor. Alternate settings up.
  • the motor rotor further includes two balance disks, two balance disks are located at the two ends of the rotor body in the axial direction, and the first cooling channel and the second cooling channel is located between the two balance plates.
  • the balance disc includes a first balance disc and a second balance disc
  • the end surface of the first balance plate facing the rotor main body is provided with a first concave portion, and the first concave portion communicates with the upstream side of the first cooling channel,
  • the end surface of the second balance plate facing the rotor main body is provided with a second concave portion, and the second concave portion communicates with the upstream side of the second cooling channel.
  • the projected areas of the first recess and the second recess account for 30% to 80% of the balance disc.
  • the rotor shaft is provided with a first hole and a second hole, the second hole is located downstream of the first hole in the flow direction of the cooling medium in the central hole side,
  • the first hole communicates with the first cooling channel through the first depression, and the second hole communicates with the second cooling channel through the second depression.
  • the first balance disk is provided with a first discharge hole
  • the second balance disk is provided with a second discharge hole
  • the first discharge hole is connected to the downstream side of the second cooling channel.
  • the second discharge hole communicates with the downstream side of the first cooling channel.
  • the first discharge hole is not connected to the first recess, and the second discharge hole is not connected to the second recess.
  • the central hole is a blind hole.
  • the present invention also proposes a motor, including a stator and the motor rotor described in any one of the above technical solutions.
  • the cooling medium can pass through the rotor of the motor oppositely and alternately, thereby cooling the rotor of the motor.
  • Fig. 1 shows a schematic structural diagram of a rotor of a motor according to an embodiment of the present invention.
  • Fig. 2 shows a cross-sectional view of a rotor of an electric machine according to an embodiment of the present invention.
  • Fig. 3 shows a schematic structural diagram of a rotor shaft of an electric motor according to an embodiment of the present invention.
  • Fig. 4 shows a schematic structural diagram of a balance plate of a motor according to an embodiment of the present invention.
  • Fig. 5 shows a schematic structural view of a rotor lamination of an electric machine according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram illustrating flow of a cooling medium in a rotor of an electric machine according to an embodiment of the present invention.
  • the axial direction A represents the axial direction of the motor, which is consistent with the axial direction of the rotor 100 of the motor;
  • the circumferential direction C represents the circumferential direction of the motor, and the circumferential direction C is consistent with the rotor 100 of the motor. 100 circumferentially consistent.
  • the present invention provides a motor, which includes a stator and a rotor 100 , and the stator may be located radially outside of the rotor 100 .
  • the stator includes stator windings, and the axial ends of the stator windings may partially protrude from the end surface of the balance disk 3 of the rotor 100 .
  • the rotor 100 includes a rotor shaft 1, a rotor main body 2 and a balance disc 3.
  • the rotor main body 2 may be cylindrical, and the balance disc 3 may be disc-shaped. Both the rotor main body 2 and the balance disc 3 are provided with a central hole, and the rotor shaft 1 passes through
  • the rotor main body 2 and the balancing disk 3 are connected to the rotor shaft 1 in a rotationally fixed manner via the rotor main body 2 and the balancing disk 3 .
  • Two balance discs 3 may be provided, and the rotor main body 2 is sandwiched between the two balance discs 3 .
  • the rotor shaft 1 can be cylindrical with a central hole 12 , and a cooling medium can pass through the central hole 12 into the interior of the rotor shaft 1 .
  • a partition 13 is arranged in the center hole 12 , the center hole 12 is a blind hole, and the partition 13 is the bottom surface of the center hole 12 .
  • the rotor shaft 1 is provided with a first hole 11A and a second hole 11B penetrating through the cylinder wall, and both the first hole 11A and the second hole 11B communicate with the central hole 12 .
  • the partition plate 13 is located on the axial side of the first hole 11A and the second hole 11B. Referring to FIG. 13 on the same side.
  • the first hole 11A and the second hole 11B are separated by a certain distance in the axial direction A of the rotor shaft 1, and in the axial direction A of the rotor shaft 1, the positions of the first hole 11A and the second hole 11B are respectively the same as the two The positions of the balance discs 3 coincide.
  • the second hole 11B may be located on the downstream side of the first hole 11A in the direction in which the cooling medium flows along the axial direction A of the center hole 12 .
  • a plurality of first holes 11A and second holes 11B may be provided along the circumferential direction C of the rotor shaft 1 , so that the cooling medium flows out from the central hole 12 through the plurality of first holes 11A and second holes 11B.
  • the balance plate 3 includes a first balance plate 301 and a second balance plate 302 , and the first balance plate 301 and the second balance plate 302 are respectively arranged at two axial ends of the rotor body 2 .
  • the side of the first balance plate 301 facing the rotor main body 2 is provided with a first concave portion 31A.
  • the first balance plate 301 is attached to the rotor main body 2 , and an accommodation chamber is formed between the first recessed portion 31A and the end surface of the rotor main body 2 , and the accommodation chamber is used for accommodating a cooling medium.
  • the first balance plate 301 is provided with a first discharge hole 32B penetrating along its axial direction, and a plurality of first discharge holes 32B may be provided along the circumferential direction C of the first balance plate 301 .
  • the first discharge hole 32B is located radially outside of the first recessed portion 31A, and the first discharge hole 32B and the first recessed portion 31A are separated, non-overlapping, and non-communicating.
  • the cooling medium can be discharged from the rotor 100 through the first discharge hole 32B, and then can flow through the axial ends of the stator windings to cool the stator windings.
  • the side of the second balance plate 302 facing the rotor main body 2 is provided with a second concave portion 31B.
  • the second balance plate 302 is attached to the rotor main body 2 , and an accommodation cavity is formed between the second recessed portion 31B and the end surface of the rotor main body 2 , and the accommodation cavity is used for accommodating a cooling medium.
  • the second balance plate 302 is provided with a second discharge hole 32A penetrating along its axial direction, and a plurality of second discharge holes 32A may be provided along the circumferential direction C of the second balance plate 302 .
  • the second discharge hole 32A is located radially outside of the second recessed portion 31B, and the second discharge hole 32A and the second recessed portion 31B are separated, non-overlapping, and non-communicating.
  • the cooling medium can be discharged from the rotor 100 through the second discharge hole 32A, and then can flow through the axial ends of the stator windings to cool the stator windings.
  • the first recessed portion 31A can cover a large area of the end surface of the first balance plate 301, for example, along the axial projection of the first balance plate 301, the projected area of the first recessed portion 31A occupies 30% of the first balance plate. 30% to 80% of 301, so that the cooling medium has a better cooling effect on the balance disk 3.
  • the first concave portion 31A may be in a closed ring shape, and the central hole of the first balance plate 301 is connected to the first concave portion 31A.
  • the outline of the first recessed portion 31A may be approximately rectangular, and in order to avoid the first discharge hole 32B, the sides of the rectangular recess may be recessed.
  • the cooling medium flowing in the first recessed portion 31A can cool the balance plate and the stator main body 2 .
  • the first balance plate 301 and the second balance plate 302 have the same structure, but different installation positions and angles. Designing and processing one balance plate can be used as the first balance plate 301 and the second balance plate 302 at the same time, which can save production costs.
  • the second recessed portion 31B and the second discharge hole 32A will not be described in detail.
  • the rotor main body 2 may include several disk-shaped rotor laminations 21 , and the rotor laminations 21 are stacked together to form a cylindrical shape.
  • the rotor laminations 21 are provided with through holes penetrating along the axial direction A thereof, and a plurality of rotor laminations 21 are stacked together so that the plurality of through holes communicate to form a cooling channel.
  • the cooling channels include a first cooling channel 2A and a second cooling channel 2B, the first cooling channel 2A and the second cooling channel 2B are provided with multiple and the same number, for example, the first cooling channel 2A and the second cooling channel 2B Four cooling channels 2B are provided.
  • the first cooling channels 2A and the second cooling channels 2B are arranged alternately in the circumferential direction C of the rotor main body 2, and the second cooling channels 2B are arranged between two adjacent first cooling channels 2A.
  • a first cooling channel 2A is provided between adjacent second cooling channels 2B.
  • the first cooling channel 2A and the second cooling channel 2B extend along the axial direction A as a whole.
  • the through holes of adjacent rotor laminations 21 do not need to be completely aligned, and can also be staggered by a certain distance, as long as they can be partially opposed to form a through cooling channel.
  • the upstream end of the first cooling channel 2A communicates with the central hole 12 through the first recess 31A, and the downstream end of the first cooling channel 2A communicates with the second discharge hole 32A.
  • the upstream end of the second cooling channel 2B communicates with the central hole 12 through the second recess 31B, and the downstream end of the second cooling channel 2B communicates with the first discharge hole 32B.
  • the rotor main body may be provided with a flow channel extending radially thereof, the first hole and the second hole may be aligned with the flow channel, so that the central hole communicates with the cooling flow channel in the rotor main body, and the cooling The medium flows radially outward in the rotor and then enters the first cooling channel and the second cooling channel.
  • the upstream side of the first cooling channel 2A (the left side in FIG. 2 and FIG. 6 ) and the downstream side of the second cooling channel 2B are located on the same side in the axial direction A of the rotor body 2 (one side in the axial direction of the rotor body 2 ). end), the downstream side of the first cooling channel 2A (the right side of FIG. 2 and FIG. 6 ) and the upstream side of the second cooling channel 2B are located on the same side in the axial direction A of the rotor main body 2 (the rotor main body 2 The other end of the axial direction), so that the flow direction of the cooling medium in the first cooling channel 2A and the second cooling channel 2B is opposite.
  • the cooling medium can effectively cool the motor rotor.
  • the cooling medium flows into the cooling flow in the rotor main body from both axial ends of the rotor
  • the channel flows out from the axial ends of the rotor and flows to the stator coils, etc. Therefore, in the present invention, the cooling of the axial ends of the rotor and stator coils is more consistent, and sufficient and effective cooling can be realized.
  • the flow direction of the cooling medium in the rotor 100 is introduced.
  • the passages or holes through which the cooling medium flows are represented materially.
  • the arrows in Fig. 2 and Fig. 6 indicate the flow direction of the cooling medium, and the cooling medium may be oil.
  • the cooling medium flows along the axial direction of the central hole 12 under the action of the pump, and is divided into two branches through the first hole 11A and the second hole 11B.
  • the cooling medium passing through the first hole 11A enters the first concave portion 31A, and the cooling medium in the first concave portion 31A can cool the first balance plate 301 .
  • the cooling medium enters the rotor main body 2 along the first cooling flow channel 2A to cool the rotor main body 2, and finally the cooling medium is discharged from the second discharge hole 32A, and the discharged cooling medium can flow to the end of the stator winding to cool the stator winding. cool down.
  • the cooling medium passing through the second hole 11B enters the second concave portion 31B, and the cooling medium in the second concave portion 31B can cool the second balance disk 302 . Then the cooling medium enters the rotor main body 2 along the second cooling channel 2B to cool the rotor main body 2 .
  • the flow direction of the cooling medium in the second cooling channel 2B is opposite to that of the cooling medium in the first cooling channel 2A. Finally, the cooling medium is discharged from the first discharge hole 32B, and the discharged cooling medium can flow to the end of the stator winding to cool the stator winding.
  • balance plate 301 first balance plate 31A first depression 32B first discharge hole 302 second balance plate 31B second depression 32A second discharge hole

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un rotor de moteur et un moteur. Le rotor de moteur comprend : un arbre de rotor (1) pourvu d'un trou central (12) pour le passage d'un fluide de refroidissement ; et un corps principal de rotor (2) en liaison résistante à la torsion avec l'arbre de rotor (1), un premier canal de refroidissement (2A) et un second canal de refroidissement (2B) étant formés à l'intérieur du corps principal de rotor (2), et le premier canal de refroidissement (2A) et le second canal de refroidissement (2B) s'étendant sensiblement dans une direction axiale (A) du rotor de moteur. Le côté amont du premier canal de refroidissement (2A) et le côté aval du second canal de refroidissement (2B) sont sur le même côté dans la direction axiale (A) du rotor de moteur, tandis que le côté aval du premier canal de refroidissement (2A) et le côté amont du second canal de refroidissement (2B) sont également sur le même côté dans la direction axiale (A) du rotor de moteur. Cette configuration permet une circulation du fluide de refroidissement dans le premier canal de refroidissement (2A) et dans le second canal de refroidissement (2B) dans des directions opposées.
PCT/CN2021/137884 2021-12-14 2021-12-14 Rotor de moteur et moteur WO2023108414A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/137884 WO2023108414A1 (fr) 2021-12-14 2021-12-14 Rotor de moteur et moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/137884 WO2023108414A1 (fr) 2021-12-14 2021-12-14 Rotor de moteur et moteur

Publications (1)

Publication Number Publication Date
WO2023108414A1 true WO2023108414A1 (fr) 2023-06-22

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Application Number Title Priority Date Filing Date
PCT/CN2021/137884 WO2023108414A1 (fr) 2021-12-14 2021-12-14 Rotor de moteur et moteur

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WO (1) WO2023108414A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5889342A (en) * 1995-12-21 1999-03-30 Aisin Aw Co., Ltd. Motor cooling circuit
CN207098801U (zh) * 2017-05-22 2018-03-13 比亚迪股份有限公司 一种具有冷却油路的电机
WO2021176309A1 (fr) * 2020-03-02 2021-09-10 Nidec Corporation Agencement de rotor doté d'un rotor refroidi par liquide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5889342A (en) * 1995-12-21 1999-03-30 Aisin Aw Co., Ltd. Motor cooling circuit
CN207098801U (zh) * 2017-05-22 2018-03-13 比亚迪股份有限公司 一种具有冷却油路的电机
WO2021176309A1 (fr) * 2020-03-02 2021-09-10 Nidec Corporation Agencement de rotor doté d'un rotor refroidi par liquide

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