WO2022142974A1 - Rotor de moteur et moteur - Google Patents

Rotor de moteur et moteur Download PDF

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Publication number
WO2022142974A1
WO2022142974A1 PCT/CN2021/134657 CN2021134657W WO2022142974A1 WO 2022142974 A1 WO2022142974 A1 WO 2022142974A1 CN 2021134657 W CN2021134657 W CN 2021134657W WO 2022142974 A1 WO2022142974 A1 WO 2022142974A1
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WO
WIPO (PCT)
Prior art keywords
laminations
rotor
holes
air duct
air
Prior art date
Application number
PCT/CN2021/134657
Other languages
English (en)
Chinese (zh)
Inventor
陈亮
Original Assignee
广东美的制冷设备有限公司
美的集团(上海)有限公司
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
Priority claimed from CN202023352344.9U external-priority patent/CN214958948U/zh
Priority claimed from CN202011634178.3A external-priority patent/CN114696494A/zh
Application filed by 广东美的制冷设备有限公司, 美的集团(上海)有限公司 filed Critical 广东美的制冷设备有限公司
Publication of WO2022142974A1 publication Critical patent/WO2022142974A1/fr

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    • 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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • 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 invention relates to the technical field of electric motors, in particular to a rotor of an electric motor and an electric motor.
  • the motor As a driving device, the motor has been widely used in various electric equipment such as robots, home appliances, and industries.
  • permanent magnet servo motors occupy most of the servo motor market due to their high torque density and high work efficiency.
  • a permanent magnet motor generally includes an inner rotor and a stator sleeved outside the inner rotor, and the inner rotor includes a rotor iron core and a permanent magnet disposed on the rotor iron core.
  • the inner rotor will generate a lot of heat, which is blocked by the air gap between the inner rotor and the stator, and the inner rotor will have the problem of poor heat dissipation. Motor failed.
  • the present invention provides a rotor of a motor and a motor to solve the technical problem of poor heat dissipation effect of a permanent magnet motor with an inner rotor in the prior art.
  • a technical solution adopted by the present invention is to provide a rotor of a motor, including:
  • a rotor iron core the rotor iron core includes a plurality of laminations of the same shape, stacked and coaxially arranged, the laminations are formed with a rotating shaft mounting hole, a plurality of rotating shaft key slot holes and a plurality of air duct holes, a plurality of the The shaft key slot hole communicates with the shaft installation hole and is arranged at intervals along the circumference of the shaft installation hole, and a plurality of the air duct holes are arranged at intervals along the circumference of the shaft installation hole.
  • the laminations in the upper layer are offset relative to the laminations in the lower layer, so that the air duct holes of the plurality of laminations together form a spiral air duct, and the laminations in the upper layer and The shaft key groove holes of the next layer of the laminations are aligned along the axial direction of the shaft mounting holes;
  • a plurality of permanent magnets are arranged on the rotor iron core.
  • a plurality of magnetic pole installation grooves are further formed on the laminations, the plurality of magnetic pole installation grooves are respectively used for installing a plurality of the permanent magnets, and the number of the shaft key slot holes is equal to the plurality of the plurality of the magnetic pole installation grooves. The number of pole pairs of the permanent magnet.
  • the offset angle of the laminations in the upper layer of the laminations relative to the laminations in the next layer is m times the angle corresponding to the number of pairs of magnetic poles, where m is A natural number, so that the upper layer of the plurality of laminations is aligned with the shaft key slot hole and the magnetic pole installation groove of the lower layer of the laminations along the axial direction of the rotation shaft installation hole.
  • the difference between the number of the air duct holes and the number of the magnetic poles of the permanent magnet is 2, 4 or 7.
  • the number of the air duct holes of the laminations is not equal to an integer multiple of the number of pairs of magnetic poles of the permanent magnet, so that the air duct holes of the plurality of laminations can work together.
  • the spiral air duct is formed.
  • a motor including:
  • a rotor sleeved on the rotating shaft and located in the casing, the rotor is the above-mentioned rotor;
  • the stator is sleeved outside the rotor and located in the casing, the stator and the rotor are spaced apart, the stator is in contact with the casing, and the inner side wall of the casing is formed with a plurality of The air duct grooves are evenly distributed along the circumferential direction of the casing.
  • the casing is formed with an air inlet and an air outlet, the air inlet is located at the bottom end of the casing, and the air outlet is located at a portion of the air inlet close to the top end of the casing. side, so that the airflow can enter the housing from the air inlet, and then flow through the helical air duct to between the rotor and the stator, the air duct slot, and flow out from the air outlet .
  • the rotor of the motor of the present invention includes a rotor iron core and a permanent magnet arranged on the rotor iron core.
  • the rotor iron core includes a plurality of laminations of the same shape, stacked and coaxially arranged, and the laminations are formed with rotating shaft installation holes and a plurality of rotating shaft key grooves hole and a plurality of air duct holes, a plurality of shaft key groove holes communicate with the shaft installation hole and are arranged at intervals along the circumferential direction of the shaft installation hole, a plurality of air duct holes are arranged at intervals along the circumferential direction of the shaft installation hole, among the plurality of laminations
  • the upper lamination sheet is offset relative to the next lamination sheet, so that the air duct holes of the multiple lamination sheets together form a spiral air duct, and the shaft key groove holes of the upper lamination sheet and the next lamination sheet are along the rotation shaft installation holes.
  • Axial alignment by setting the helical air duct in the rotor, the air in the helical air duct can form a pressure difference in the axial direction of the rotor during the rotation of the rotor, thereby forming an airflow, which can take the heat out of the motor and realize
  • the rapid heat dissipation of the motor protects the permanent magnet from the risk of demagnetization, and can also reduce the weight of the rotor, thereby reducing the rotational inertia of the rotor, which is conducive to the rapid start and rapid braking of the motor.
  • Fig. 1 is the three-dimensional structure schematic diagram of the rotor embodiment of the motor of the present invention
  • Fig. 2 is the perspective structure schematic diagram of the rotor embodiment of the motor of the present invention.
  • Fig. 3 is the top-view structure schematic diagram of the lamination in the rotor embodiment of the motor of the present invention.
  • FIG. 4 is a schematic cross-sectional structure diagram of an embodiment of the motor of the present invention.
  • FIG. 5 is a top-view structural schematic diagram of an embodiment of the motor of the present invention.
  • FIG. 6 is a schematic cross-sectional structural diagram of another embodiment of the motor of the present invention.
  • first and second in this application are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features.
  • a plurality of means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.
  • the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion.
  • a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.
  • an embodiment of the rotor 10 of the motor of the present invention includes a rotor iron core 100 and a plurality of permanent magnets 200 disposed on the rotor iron core 100 .
  • the rotor iron core 100 includes a plurality of identical shapes, stacked and coaxially arranged
  • the laminated sheet 110 is formed with a rotating shaft mounting hole 111, a plurality of rotating shaft key groove holes 112 and a plurality of air duct holes 113, and the multiple rotating shaft key groove holes 112 are communicated with the rotating shaft mounting hole 111 and along the circumference of the rotating shaft mounting hole 111
  • the plurality of air duct holes 113 are arranged at intervals along the circumferential direction of the shaft mounting hole 111 , and the upper lamination sheet 110 of the plurality of lamination sheets 110 is offset from the next lamination sheet 110 , so that the plurality of lamination sheets 110
  • the air duct holes 113 form a spiral air duct together, and the shaft key groove holes 112 of the upper laminated sheet
  • the air in the helical air duct can form a pressure difference in the axial direction of the rotor 10 during the rotation of the rotor 10, thereby forming an air flow, which can make the air in the motor
  • the heat is carried out to achieve rapid heat dissipation of the motor, protect the permanent magnet 200 from the risk of demagnetization, and can also reduce the weight of the rotor 10, thereby reducing the moment of inertia of the rotor 10, which is conducive to the rapid start and braking of the motor.
  • the rotating shaft mounting holes 111 are arranged in a circular shape, which facilitates assembly with the rotating shaft (not shown in the figure), and facilitates alignment along the axial direction of the rotating shaft mounting holes 111 when a plurality of laminations 110 are stacked and arranged, so as to The rotor core 100 is press-formed.
  • the shaft keyway holes 112 are arranged in a square shape, and the plurality of shaft keyway holes 112 on the same lamination sheet 110 are evenly spaced along the circumferential direction of the shaft installation hole 111 , so that the shaft keyway holes on the plurality of lamination sheets 110 are evenly spaced.
  • the axial alignment of 112 can achieve precise alignment and positioning when the laminations 110 are stacked, and can cooperate with the shaft key in the shape of a straight strip on the rotating shaft to limit the rotor core 100, so that the rotor core 100 is in the
  • the rotor 10 is not easy to slide relative to the rotating shaft during the rotation process, the structure of the rotor 10 is more stable, and the reliability is higher, so that the torque generated on the rotor 10 can be efficiently output to the rotating shaft through the rotating shaft key.
  • the shaft keyway hole 112 may be provided in other shapes such as a circle or a trapezoid, which is not limited herein.
  • the plurality of air duct holes 113 and the shaft key slot holes 112 are arranged at intervals along the radial direction of the shaft installation hole 111 to avoid interference with the shaft key slot holes 112, resulting in irregular structures of the plurality of air duct holes 113. Affects the smoothness of airflow in the spiral duct.
  • the air duct hole 113 may also be communicated with the rotating shaft mounting hole 111 or the rotating shaft key slot hole 112 to realize direct heat dissipation to the rotating shaft and improve heat dissipation efficiency.
  • the air duct holes 113 are fan-shaped, so that the ratio of the cross-sectional area of the air duct holes 113 in the radial direction of the shaft mounting hole 111 to the cross-sectional area of the laminations 110 in the radial direction of the shaft installation hole 111 can be larger. , the airflow flowing through the spiral air duct is larger, and the heat dissipation effect is better, and the plurality of air duct holes 113 are evenly spaced along the circumference of the rotating shaft installation hole 111, which can form a regular spiral air duct, so that the spiral air The airflow in the channel is smoother and the airflow speed is faster, which further improves the heat dissipation effect.
  • the air duct holes 113 may also be provided in other shapes such as a circle, a square, or a trapezoid, which is not limited herein.
  • the side wall of the air duct hole 113 can also be smoothed by spraying or melting, which can make the air flow in the air duct hole 113 smoother, the heat dissipation speed is faster, and the heat dissipation effect is better.
  • the structures of the plurality of laminations 110 are completely the same, and can be processed by the same mold, which is convenient for batch processing and lowers the processing difficulty and cost.
  • the number of the air duct holes 113 of the laminations 110 is not equal to the integer multiple of the number of pole pairs of the permanent magnet 200 , so that the solid part of the upper lamination piece 110 and the air duct holes of the next lamination piece 110 are not equal.
  • the projections of 113 on the axial direction of the shaft mounting hole 111 are at least partially overlapped, so that the air channel holes 113 of the plurality of laminations 110 can jointly form a spiral air channel.
  • a plurality of magnetic pole installation slots 114 are further formed on the laminations 110 , the plurality of magnetic pole installation slots 114 are respectively used for installing the plurality of permanent magnets 200 , and the number of the shaft key slot holes 112 is equal to the magnetic poles of the plurality of permanent magnets 200 .
  • the magnetic pole installation slots 114 are formed on the outer surface of the laminations 110 to facilitate the interaction between the rotor 10 and the outer stator (not shown in the figure), thereby realizing the rotation of the rotor 10 relative to the stator.
  • the pole mounting grooves 114 may also be formed in the laminations 110 , which is not limited herein.
  • the laminations 110 may not be provided with magnetic pole installation slots, and the permanent magnets 200 are directly fixed on the outer surface of the rotor core 100 by welding, sticking or snapping, etc., which is not limited here.
  • an angle by which an upper lamination 110 of the plurality of laminations 110 is offset relative to the next lamination 110 is an angle corresponding to m times the number of magnetic pole pairs, where m is a natural number, so that the plurality of laminations
  • the shaft key slot 112 and the magnetic pole installation slot 114 of the upper laminated sheet 110 and the next laminated sheet 110 in the 110 are aligned along the axial direction of the shaft installation hole 111 .
  • the sheet 110 is offset at an angle of m ⁇ 72°, so that the shaft key slot 112 and the magnetic pole installation slot 114 of the two laminated sheets 110 are aligned along the axial direction of the shaft installation hole 111 .
  • each lamination 110 is assembled with an offset of m ⁇ 72° relative to the next lamination 110 in the same direction (counterclockwise or clockwise), so that a rotor core formed by pressing a plurality of laminations 110 100 can form a helical air duct, and the shaft key slot 112 and the magnetic pole installation slot 114 of the plurality of laminations 110 are aligned along the axial direction of the shaft installation hole 111 , so that the shaft and the permanent magnet 200 can be installed.
  • S is the number of air duct holes 113 of the laminations 110
  • P is the number of pole pairs of the permanent magnet 200
  • k is the rounded integer value of m ⁇ S/P.
  • n is a natural number, which can make two adjacent laminations
  • the overlapping area of the air duct holes 113 of the 110 is larger, so that the helical air duct of the rotor core 100 has a larger cross-sectional area along the radial direction of the rotating shaft installation hole 111, and the air flow through the spiral air duct is larger. The cooling effect is better.
  • the difference between the number S of the air duct holes 113 and the number 2 ⁇ P of the number of magnetic poles of the permanent magnet 200 is 2, 4, or 7, etc., so that the number of the air duct holes 113 of the laminations 110 is related to the rotation axis.
  • the number of the key slot holes 112 achieves a better matching effect, which makes the volume of the spiral air duct larger without excessively increasing the processing difficulty of the laminations 110, thereby making the air flow through the spiral air duct larger and the heat dissipation effect. better.
  • the number of pole pairs P of the permanent magnet 200 is 5
  • the number S of the air duct holes 113 of the laminated sheet 110 is 14, and the upper laminated sheet 110 is opposite to the next laminated sheet
  • m may also take other values such as 2 or 3, which are not limited herein.
  • the number of pole pairs P of the permanent magnet 200 can also be a commonly used number 4, the number S of the air duct holes 113 of the laminations 110 is 15, and the upper lamination 110 rotates relative to the next lamination 110
  • the number of pole pairs P of the permanent magnet 200 may also take other required numbers such as 2 or 3, which is not limited herein.
  • the side wall of the air duct hole 113 may also be inclined relative to the axial direction of the shaft mounting hole 111 , and the inclination angle may be relative to the next laminated sheet connected with the air duct hole 113 of the previous laminated sheet 110 according to the axial direction of the shaft mounting hole 111 .
  • the offset angle of the air duct holes 113 of 110 is set, so that the transition of the air duct holes 113 of the two adjacent laminated sheets 110 is smoother, the airflow in the spiral air duct is smoother, and the airflow speed is faster, which further improves the heat dissipation effect.
  • an embodiment of the motor of the present invention includes a casing 20 , a rotating shaft 30 , a rotor 10 and a stator 40 .
  • the rotating shaft 30 is disposed through the casing 20
  • the rotor 10 is sleeved on the rotating shaft 30 and is located in the casing 20
  • the stator 40 is sleeved outside the rotor 10, and is located in the casing 20, the stator 40 and the rotor 10 are spaced apart
  • the stator 40 is in contact with the casing 20
  • the inner side wall of the casing 20 is formed with a plurality of circumferences along the casing.
  • the structure of the rotor 10 can be referred to in the above-mentioned embodiment of the rotor 10 , and details are not repeated here.
  • the air in the casing 20 can enter the spiral air duct from the bottom of the rotor 10 to form a spiral air flow and flow out from the top of the rotor 10 to the top of the casing 20, and then from the top of the rotor 10 to the top of the casing 20.
  • the top of the casing 20 flows to the bottom of the casing 20 through the gap between the rotor 10 and the stator 40 and the air duct slot 210, so as to realize heat dissipation of the motor.
  • the helical air duct can also be set so that the air enters from the top of the rotor 10 and flows out from the bottom, which is not limited here.
  • the flow direction of the air can be changed by changing the spiral direction of the helical air duct, and the flow direction of the air can also be changed by changing the rotation direction of the rotor 10 .
  • the air in the helical air duct can form a pressure difference in the axial direction of the rotor 10 during the rotation of the rotor 10, thereby forming an airflow, which can take out the heat in the motor and realize the motor
  • the rapid heat dissipation can protect the permanent magnet 200 from demagnetization risk, and can also reduce the weight of the rotor 10, thereby reducing the rotational inertia of the rotor 10, which is conducive to the rapid start and rapid braking of the motor.
  • another embodiment of the motor of the present invention includes a housing 20 , a rotating shaft 30 , a rotor 10 and a stator 40 , wherein the structures of the rotating shaft 30 , the rotor 10 and the stator 40 refer to the above-mentioned motor embodiment, and are not repeated here.
  • an air inlet 201 and an air outlet 202 are formed on the casing 20 , and the air inlet 201 is located at the bottom end of the casing 20 and formed in the casing 20 .
  • the air outlet 202 is located on the side of the air inlet 201 close to the top of the casing 20, and is formed on the side wall of the casing 20, so that the air can enter the casing 20 from the air inlet 201, and then pass through the spiral air duct It flows between the rotor 10 and the stator 40, the air duct slot 210, and flows out from the air outlet 202, so that the airflow entering the spiral air duct is the air with lower temperature introduced from the outside through the air inlet 201, and the air flows through the rotor 10.
  • stator 40 and the housing 20 increase the contact area with the inner surface of the motor, so that the heat generated by the motor can be more effectively conducted into the air flow, and dissipated to the outside through the air outlet 202 with the air flow to achieve better heat dissipation Effect.
  • the air inlet 201 and the air outlet 202 may also be formed on the top wall and/or the bottom wall of the housing 20 , which is not limited herein.
  • the air inlet 201 and the air outlet 202 may also be disposed at opposite ends of the housing 20, so that air can enter from one end of the housing 20 and flow out from the other end of the housing 20, so that the air inside the motor The conversion speed between air and outside air is faster, and the heat dissipation effect is better.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Sont divulgués dans la présente invention un rotor de moteur et un moteur. Le rotor comprend un noyau de fer de rotor et des aimants permanents disposés sur le noyau de fer de rotor ; le noyau de rotor comprend une pluralité de stratifications qui ont la même forme et sont empilées et disposées de manière coaxiale ; un trou d'installation d'arbre, une pluralité de trous de fente de dents d'arbre et une pluralité de trous de passage d'air sont formés sur chaque stratification ; la pluralité de trous de fente de dents d'arbre et la pluralité de trous de passage d'air sont formés à des intervalles le long de la circonférence du trou d'installation d'arbre ; et dans la pluralité de stratifications, des stratifications au niveau de couches adjacentes sont relativement décalées, de telle sorte que les trous de passage d'air de la pluralité de stratifications forment ensemble un passage d'air hélicoïdal et les trous de fente de dents d'arbre des stratifications au niveau de couches adjacentes sont alignés dans la direction axiale du trou d'installation d'arbre. La fourniture du passage d'air hélicoïdal dans le rotor amène l'air dans le passage d'air hélicoïdal à former une différence de pression dans la direction axiale du rotor pendant la rotation du rotor, de manière à former un flux d'air, de telle sorte que la chaleur dans le moteur puisse être évacuée, ce qui permet d'obtenir une dissipation de chaleur rapide du moteur et de protéger les aimants permanents du risque de démagnétisation.
PCT/CN2021/134657 2020-12-31 2021-11-30 Rotor de moteur et moteur WO2022142974A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202011634178.3 2020-12-31
CN202023352344.9U CN214958948U (zh) 2020-12-31 2020-12-31 一种电机的转子及电机
CN202011634178.3A CN114696494A (zh) 2020-12-31 2020-12-31 一种电机的转子及电机
CN202023352344.9 2020-12-31

Publications (1)

Publication Number Publication Date
WO2022142974A1 true WO2022142974A1 (fr) 2022-07-07

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ID=82259031

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/134657 WO2022142974A1 (fr) 2020-12-31 2021-11-30 Rotor de moteur et moteur

Country Status (1)

Country Link
WO (1) WO2022142974A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451856A (zh) * 2016-11-18 2017-02-22 广西大学 一种带气体循环功能的永磁同步电机转子
WO2017125371A1 (fr) * 2016-01-19 2017-07-27 Continental Automotive Gmbh Paquet de tôles de rotor pour une machine électrique
CN108432093A (zh) * 2016-01-15 2018-08-21 大陆汽车有限公司 电动机器
CN110036553A (zh) * 2016-12-15 2019-07-19 世倍特集团有限责任公司 电机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108432093A (zh) * 2016-01-15 2018-08-21 大陆汽车有限公司 电动机器
WO2017125371A1 (fr) * 2016-01-19 2017-07-27 Continental Automotive Gmbh Paquet de tôles de rotor pour une machine électrique
CN106451856A (zh) * 2016-11-18 2017-02-22 广西大学 一种带气体循环功能的永磁同步电机转子
CN110036553A (zh) * 2016-12-15 2019-07-19 世倍特集团有限责任公司 电机

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