WO2016183706A1 - Moteur électrique à fréquence variable à trois phases et machine à laver - Google Patents

Moteur électrique à fréquence variable à trois phases et machine à laver Download PDF

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Publication number
WO2016183706A1
WO2016183706A1 PCT/CN2015/079014 CN2015079014W WO2016183706A1 WO 2016183706 A1 WO2016183706 A1 WO 2016183706A1 CN 2015079014 W CN2015079014 W CN 2015079014W WO 2016183706 A1 WO2016183706 A1 WO 2016183706A1
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WO
WIPO (PCT)
Prior art keywords
rotor
stator
variable frequency
teeth
phase variable
Prior art date
Application number
PCT/CN2015/079014
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English (en)
Chinese (zh)
Inventor
肖海泉
高振刚
迟闯
Original Assignee
佛山市威灵洗涤电机制造有限公司
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
Application filed by 佛山市威灵洗涤电机制造有限公司 filed Critical 佛山市威灵洗涤电机制造有限公司
Priority to PCT/CN2015/079014 priority Critical patent/WO2016183706A1/fr
Publication of WO2016183706A1 publication Critical patent/WO2016183706A1/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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/12—Asynchronous induction motors for multi-phase current
    • H02K17/14—Asynchronous induction motors for multi-phase current having windings arranged for permitting pole-changing

Definitions

  • the invention belongs to the field of electric machines, and in particular relates to a three-phase variable frequency motor for a washing machine and a washing machine therewith.
  • the washing machine As a commonly used household appliance, the washing machine has been widely used in people's lives. At present, the functions of the washing machine are relatively strong. For example, the user can select the corresponding washing program according to the type of load during use, and most of the current washing machines have water saving and power saving, high washing ratio, small damage to the clothes, and washing speed of the washing machine. Supports the adjustment from 400 to 1600 rpm, the water content is small after the dehydration of the clothes, and the drying time is short.
  • people choose the washing machine in addition to pay attention to the functional characteristics of the washing machine, it will also pay attention to the vibration and noise performance of the washing machine.
  • the vibration and noise performance of the washing machine is also often overlooked by the designers in the development of washing machines, so that the existing washing machine can not satisfy people's pursuit of high quality living standards.
  • the motor is an important component that affects the vibration and noise of the washing machine.
  • the three-phase inverter motor for washing machine is a new type of three-phase asynchronous motor with variable frequency variable voltage. Because it needs to meet the design requirements that can be adjusted at various speeds, it is necessary to use a special variable frequency drive to drive the three-phase inverter motor. However, the voltage and current output of the variable frequency drive contain more harmonic components, and the frequency and voltage vary widely during operation. If the conventional three-phase asynchronous motor is still used, the design scheme of the near-slot and small groove of the stator and rotor is still adopted.
  • the number of stator slots of the stator core is similar to the number of rotor slots of the rotor core, and both are relatively small
  • smooth torque characteristics and efficient motor performance will not be obtained, and serious problems will occur during the operation of the motor.
  • the electromagnetic vibration and noise can not meet the design requirements of high efficiency and low noise of the motor for washing machine, which seriously affects the improvement of the comprehensive performance of the washing machine.
  • the object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a three-phase variable frequency motor and a washing machine, which solves the technical problem that the motor for the washing machine cannot meet the requirements of high efficiency and low noise performance.
  • a three-phase variable frequency motor comprising a stator assembly and a rotor assembly mated with the stator assembly, the stator assembly including a stator core and a stator core a stator winding, the rotor assembly comprising a rotor core, the stator core having a plurality of stator teeth, and a stator slot formed between any two adjacent stator teeth, the rotor core having a plurality of rotor teeth a rotor slot is formed between any two adjacent rotor teeth, the number of slots of the stator slot is 36, the number of slots of the rotor slot is 48; and the rotor slot is along the rotor core A chute that is axially inclined.
  • t is the pitch of the stator teeth.
  • the rotor has a chute s of 1.15.
  • the stator winding is a three-phase symmetrical winding, and the number of poles of the stator winding is four poles.
  • the rotor core is threaded and mounted on an inner side of the stator core.
  • the tooth widths of the stator teeth are equal, and the tooth widths of the rotor teeth are equal.
  • the rotor teeth have a tooth width of 2.4 ⁇ 0.2 mm and the stator teeth have a tooth width of 3.4 ⁇ 0.2 mm.
  • the rotor core is laminated by a plurality of rotor punches.
  • the stator core is laminated by a plurality of stator punches.
  • the three-phase variable frequency motor provided by the invention increases the number of stator slots and rotor slots, designs the number of rotor slots to be much more than the number of stator slots, and specifically verifies the stator slot and the rotor slot by simulation optimization design and prototype verification.
  • the matching ratio is designed to be the optimum value of 36/48.
  • the rotor groove is designed as a chute which is inclined along the axial direction of the rotor core, so that the purpose of effectively optimizing the structure of the three-phase variable frequency motor can be achieved and suppressed.
  • the high-order harmonics generated by the variable frequency drive have harmful effects on the noise, vibration and output characteristics of the three-phase inverter motor, which reduces the electromagnetic noise and electromagnetic vibration generated during the operation of the three-phase inverter motor, and avoids the three-phase inverter motor running.
  • the phenomenon of electromagnetic noise that is easily perceived by the human ear is generated in the project, and the three-phase variable frequency motor is guaranteed to have a smooth output torque under high-speed operating conditions under high-speed operating conditions.
  • the characteristics of the line speed improve the overall performance of the three-phase inverter motor, which satisfies the high-efficiency and low-noise design requirements of the three-phase inverter motor.
  • the present invention also provides a washing machine having the above-described three-phase variable frequency motor.
  • the washing machine provided by the invention adopts the above-mentioned three-phase variable frequency motor, thereby effectively avoiding the electromagnetic noise which is easily perceived by the human ear in the operation process of the washing machine, and ensuring the output of the three-phase variable frequency motor under the low speed washing condition.
  • the maximum dehydration speed is obtained, which can meet the demand of low-noise and small-vibration washing machines under the premise of ensuring the powerful washing function of the washing machine, and caters to people's high quality living standards. pursue.
  • FIG. 1 is a schematic front view of a rotor core according to an embodiment of the present invention.
  • FIG. 2 is a schematic left side view of a rotor core according to an embodiment of the present invention.
  • FIG. 3 is a left side schematic view of a stator core according to an embodiment of the present invention.
  • FIG. 4 is an exploded perspective view of a three-phase variable frequency motor and a controller according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of integrated assembly of a three-phase variable frequency motor and a controller according to an embodiment of the present invention.
  • a three-phase variable frequency motor 1 includes a stator assembly 11 and a stator
  • the subassembly 11 cooperates with a rotor assembly 12 including a stator core 111 and a stator winding 112 disposed on the stator core 111.
  • the stator winding 112 may specifically be a coil winding
  • the rotor assembly 12 includes a rotor core 121 and is disposed on The rotor winding 122 on the rotor core 121, the rotor winding 122 may specifically be a coil winding or a permanent magnet winding or a squirrel cage cast aluminum winding.
  • the stator core 111 includes a stator yoke 1113 and a plurality of stator teeth spaced apart from the stator yoke 1113. 1111, and a stator slot 1112 is formed between any two adjacent stator teeth 1111.
  • the rotor core 121 includes a rotor yoke 1213 and a plurality of rotor teeth 1211 spaced apart from the rotor yoke 1213, and any adjacent two rotor teeth 1211 A rotor slot 1212 is formed, the number of slots of the stator slot 1112 is 36, and the number of slots of the rotor slot 1212 is 48.
  • the rotor slot 1212 is a slot that is inclined along the axial direction of the rotor core 121, that is, the rotor slot 1212
  • the axial side of the rotor core 121 extends obliquely toward the other axial side of the rotor core 121.
  • the three-phase variable frequency motor 1 provided by the embodiment of the present invention designs the number of the rotor slots 1212 to be much more than the number of the stator slots 1112 by increasing the number of the stator slots 1112 and the rotor slots 1212, and specifically through simulation optimization design and prototype verification.
  • the mixing ratio of the stator groove 1112 and the rotor groove 1212 is designed to be an optimum value of 36/48, and at the same time, the rotor groove 1212 is designed as a chute which is inclined along the axial direction of the rotor core 121, thereby achieving effective optimization.
  • the purpose of the structure of the three-phase inverter motor 1 is to suppress the harmful effects of the higher harmonics generated by the variable frequency drive on the noise, vibration and output characteristics of the three-phase inverter motor 1, and reduce the electromagnetic generated during the operation of the three-phase inverter motor 1.
  • the noise and electromagnetic vibration avoid the phenomenon that the three-phase inverter motor 1 generates electromagnetic noise that is easily perceived by the human ear in the operation process, and ensures that the three-phase inverter motor 1 outputs torque under smooth running conditions under low speed operation conditions.
  • the characteristics of the maximum operating speed are obtained, and the overall performance of the three-phase variable frequency motor 1 is improved, which satisfies the design requirements of the three-phase variable frequency motor 1 with high efficiency and low noise.
  • the distance ie, the projection distance of the rotor groove 1212 at the axial ends of the rotor core 121 in the circumferential direction of the rotor core 121
  • t is the pitch t of the stator teeth 1111 (ie, the same portion of the adjacent two stator teeth 1111) Distance between).
  • the high-order harmonics generated by the variable frequency drive can be harmful to the noise, vibration and output characteristics of the three-phase inverter motor 1.
  • the effect is relatively small, and the effect of reducing the electromagnetic noise and electromagnetic vibration of the three-phase variable frequency motor 1 is better.
  • the rotor has a slot s of 1.15.
  • the high-order harmonics generated by the variable frequency drive can be made to the three-phase inverter motor. 1 noise
  • the harmful effects caused by the sound, vibration and output characteristics are minimized, and the effect of reducing the electromagnetic noise and electromagnetic vibration of the three-phase inverter motor 1 is most remarkable.
  • stator windings 112 are three-phase symmetrical windings, and the number of poles of the stator windings 112 is four poles, so that the winding of the stator windings 112 can be facilitated, and the electromagnetic characteristics of the stator windings 112 can be ensured.
  • the rotor core 121 is mounted on the inner side of the stator core 111, that is, the three-phase inverter motor 1 provided in this embodiment is preferably an inner rotor motor, and thus the improvement is achieved.
  • the high-efficiency performance of the phase-converter motor 1 and the low noise performance of the three-phase inverter motor 1 are remarkable, and can meet the design requirements of high-efficiency and low-noise of the three-phase inverter motor for washing machine.
  • a shaft hole 1214 through which the rotating shaft 15 is bored is disposed at a central position of the rotor core 121.
  • the shaft hole 1214 is specifically disposed through the rotor yoke 1213.
  • the center of the stator core 111 is disposed through the rotor assembly 12 for penetration.
  • An inner hole 1114 is provided, and the inner hole 1114 is specifically formed by enclosing the stator teeth 1111.
  • the tooth widths tk2 of the stator teeth 1111 are equal, the tooth pitches t between the adjacent two stator teeth 1111 are equal, and the tooth widths tk1 of the rotor teeth 1211 are equal, and the adjacent two rotor teeth 1211 are equal.
  • the pitches of the teeth are equal, so that the symmetry of the structure of the stator core 111 and the rotor core 121 can be ensured, and the manufacture of the stator core 111 and the rotor core 121 can be facilitated.
  • the tooth width tk1 of the rotor tooth 1211 is 2.4 ⁇ 0.2 mm, and the tooth width tk2 of the stator tooth 1111 is 3.4 ⁇ 0.2 mm, so that the improved performance of the three-phase variable frequency motor 1 is improved and the three-phase variable frequency motor is reduced.
  • the effect of low noise performance is remarkable.
  • the stator tooth 1111 specifically includes a first tooth root 11111 and a first toothed shoe 11112.
  • the first tooth root 11111 is located between the stator yoke 1113 and the first toothed shoe 11112.
  • the tooth width tk2 of the stator tooth 1111 specifically refers to the first tooth root 11111.
  • the rotor tooth 1211 specifically includes a second root 12111 and a second toothed shoe 12112.
  • the second root 12111 is located between the rotor yoke 1213 and the second toothed shoe 12112.
  • the tooth width tk1 of the rotor tooth 1211 specifically refers to the second tooth root 12111.
  • both stator teeth 1111 and rotor teeth 1211 are parallel teeth.
  • each of the first roots 11111 has two first circumferential side walls disposed in a circumferentially opposite direction, and the two first circumferential side walls of the first root 11111 on each of the stator teeth 1111 are mutually Parallel;
  • each of the second roots 12111 has two second circumferential side walls disposed in a circumferentially opposite direction, and the two first circumferential side walls of the second root 12111 on each of the rotor teeth 1211 are parallel to each other .
  • Both the stator teeth 1111 and the rotor teeth 1211 are provided as parallel teeth, which are simple in structure and easy to manufacture.
  • the rotor core 121 is formed by stacking a plurality of rotor punches along the axial direction of the rotor core 121.
  • the sub-chips can be connected together by rivets.
  • the rotor core 121 is formed by laminating a rotor punch, so that the tilting effect of the rotor groove 1212 is formed by lamination of the rotor punch, which is much simpler to manufacture than the integrally formed rotor core 121. And to ensure the molding quality of the rotor core 121.
  • the rotor punching piece can be integrally stamped and formed by the punching machine, the manufacturing process is very simple, the manufacturing efficiency is high, the manufacturing cost is low, and it is suitable for mass production, thereby simplifying the manufacturing process of the rotor core 121 and improving the rotor.
  • the rotor punching piece can be specifically punched out from a silicon steel sheet, so as to facilitate the magnetic permeability of the rotor core 121 and reduce the processing cost of the rotor core 121.
  • the stator core 111 is formed by stacking a plurality of stator punches along the axial direction of the stator core 111, and the stator punches can be connected together by rivets.
  • the stator punching piece can be integrally stamped and formed by the punching machine, the manufacturing process is very simple, the manufacturing efficiency is high, the manufacturing cost is low, and the manufacturing process is suitable for mass production, thereby simplifying the manufacturing process of the stator core 111 and improving the stator.
  • the manufacturing efficiency of the iron core 111 can be specifically punched out from a silicon steel sheet, so as to facilitate the magnetic permeability of the stator core 111 and reduce the processing cost of the stator core 111.
  • the three-phase inverter motor 1 provided by the embodiment of the present invention further includes a front end cover 13, a rear end cover 14, a rotating shaft 15, a front bearing 16, and a rear bearing 17, a front end cover 13 and a rear end.
  • the end caps 14 are respectively located on the axial sides of the stator assembly 11, and the rotor assembly 12 is fastened and mounted on the rotating shaft 15 and is mounted on the inner side of the stator assembly 11, and both ends of the rotating shaft 15 pass through the front bearing 16 and the rear bearing 17, respectively. Supported on the front end cover 13 and the rear end cover 14.
  • the embodiment of the present invention further provides a washing machine having the above-described three-phase variable frequency motor 1.
  • the washing machine provided by the embodiment of the invention adopts the three-phase variable frequency motor 1 described above, thereby effectively avoiding electromagnetic noise which is easily perceived by the human ear in the running process of the washing machine, and ensures that the three-phase variable frequency motor 1 is at a low speed washing machine.
  • the demand for low noise and small vibration washing machine can be satisfied under the premise of ensuring the powerful washing function of the washing machine, and the people are high. The pursuit of quality living standards.
  • the washing machine further comprises a controller 2 for controlling the operation of the three-phase variable frequency motor 1, and the controller 2 is integrated with the three-phase variable frequency motor 1, that is, the controller 2 and the three phases
  • the variable frequency motor 1 is assembled to form a module assembly, so that the controller 2 and the three-phase variable frequency motor 1 can be integrated as a whole
  • the parts are in stock and installed, thereby facilitating reducing the size of the space occupied by the controller 2 and the three-phase variable frequency motor 1 in the washing machine, and facilitating quick disassembly and assembly of the controller 2 and the three-phase variable frequency motor 1 in the washing machine.
  • the controller 2 is mounted on the rear end cover 14 of the three-phase inverter motor 1.
  • the rear end cover 14 includes an end cover body 141 and mounting legs 142 protruding from the outer periphery of the end cap body 141.
  • the controller 2 is mounted on a side of the end cap body 141 opposite to the stator assembly 11.
  • the mounting foot 142 has a tangential plane 1421 facing the controller 2, and the arrangement of the tangential plane 1421 can reduce the interference of the mounting foot 142 on the mounting of the controller 2 on the rear end cover 14, so that the circuit board 21 of the controller 2 does not need to be
  • the chamfer avoids the mounting leg 142, thereby maximizing the circuit board 21 that can be employed by the controller 2, sufficiently ensuring the wiring requirements of the board 21 of the controller 2.
  • a mounting post (not shown) is disposed in the washing machine, and the three-phase inverter motor 1 is fastened to the mounting post by the mounting leg 142.
  • the mounting leg 142 is provided with an insertion hole 1422 for inserting a connection post (not shown) and an opening groove 1423 extending through the cutting plane 1421 toward the insertion hole 1422.
  • the setting of the jack 1422 is mainly used for connecting with the mounting post on the washing machine to realize the mounting and fixing of the three-phase variable frequency motor 1 on the washing machine.
  • the opening slot 1423 is disposed such that the socket 1422 has a certain expandability, that is, the mounting leg 142 has better elastic deformation performance at the opening groove 1423, so that although the cutting plane 1421 is disposed, the inner contour of the socket 1422 is provided.
  • the expandability of the receptacle 1422 allows the mounting post to be easily inserted into the receptacle 1422; and when the mounting post is inserted into the receptacle 1422, the resilient restoring force of the mounting foot 142 allows
  • the inner wall of the socket 1422 can be closely attached to the outer wall of the mounting post, thereby ensuring the stable reliability of the mounting leg 142 to the mounting post.
  • the installation size of the three-phase inverter motor 1 and the controller 2 can be changed after the integrated design, that is, the size of the mounting column does not change, and the mounting post has multiple The relative position between the mounting posts also does not change, improving the versatility of the rear end cover 14.
  • the outer contour of the mounting foot 142 is formed by enclosing the C-shaped curved surface and the tangential plane 1421, that is, the mounting foot 142 is equivalent to cutting the remaining portion by a cylinder with a tangential plane 1421.
  • the mounting post has a column shape
  • the insertion hole 1422 is a cylindrical hole, so that the outer shape of the mounting leg 142 is formed by the C-shaped curved surface and the cutting plane 1421, which can ensure the uniformity of the wall thickness of the mounting leg 14212, and
  • the structure is simple and easy to manufacture.
  • the controller 2 includes a circuit board 21 and a shield 22, and the circuit board 21 is located between the end cap body 141 and the shield 22 along the axial direction of the end cap body 141.
  • the shield 22 is preferably made of a waterproof material, which prevents direct exposure of the circuit board 21, thus ensuring the use of the controller 2 on the one hand. Electrical safety, on the other hand, can prevent impurities such as dust and moisture from invading the electronic components of the circuit board 21, effectively protecting the circuit board 21, and ensuring the service life of the controller 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Abstract

La présente invention est applicable au domaine des moteurs électriques, et porte sur un moteur électrique à fréquence variable à trois phases et une machine à laver. Le moteur électrique à fréquence variable à trois phases comprend un ensemble stator et un ensemble rotor coopérant avec l'ensemble stator, l'ensemble stator comprenant un noyau de fer de stator et un enroulement de stator disposé sur le noyau de fer de stator, et l'ensemble rotor comprenant un noyau de fer de rotor. Le noyau de fer de stator a plusieurs dents de stator, et une fente de stator est formée entre deux quelconques dents de stator adjacentes ; le noyau de fer de rotor a plusieurs dents de rotor, et une fente de rotor est formée entre deux quelconques dents de rotor adjacentes ; le nombre de fentes de stator est de 36, et le nombre de fentes de rotor est de 48 ; et les fentes de rotor sont des fentes obliques qui sont inclinées dans une direction axiale du noyau de fer de rotor. Par l'optimisation de la structure du moteur électrique à fréquence variable à trois phases, la présente invention supprime efficacement des effets nuisibles provenant des harmoniques d'ordre supérieur générées par un dispositif d'entraînement à fréquence variable au bruit, des caractéristiques de sortie et de vibration du moteur électrique à fréquence variable à trois phases, et successivement permet de résoudre les problèmes techniques selon lesquels le moteur électrique existant pour une machine à laver ne peut pas satisfaire les exigences de performance de rendement élevé et de faible bruit.
PCT/CN2015/079014 2015-05-15 2015-05-15 Moteur électrique à fréquence variable à trois phases et machine à laver WO2016183706A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/079014 WO2016183706A1 (fr) 2015-05-15 2015-05-15 Moteur électrique à fréquence variable à trois phases et machine à laver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/079014 WO2016183706A1 (fr) 2015-05-15 2015-05-15 Moteur électrique à fréquence variable à trois phases et machine à laver

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WO2016183706A1 true WO2016183706A1 (fr) 2016-11-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113765272A (zh) * 2021-09-01 2021-12-07 中山市普阳电子科技有限公司 一种塑封电机
CN113872350A (zh) * 2021-10-14 2021-12-31 广东美芝制冷设备有限公司 定子结构、电机结构、压缩机结构和制冷设备
CN114552911A (zh) * 2022-03-09 2022-05-27 上海电机系统节能工程技术研究中心有限公司 四六八极电机转子冲片设计方法

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CN104410183A (zh) * 2014-11-14 2015-03-11 江苏大中电机股份有限公司 低电磁噪声的高效节能电动机
CN204597743U (zh) * 2015-05-15 2015-08-26 佛山市威灵洗涤电机制造有限公司 三相变频电机及洗衣机

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Publication number Priority date Publication date Assignee Title
CN2572649Y (zh) * 2002-10-08 2003-09-10 青岛天一集团有限公司 一种高起动力矩电动机
CN2788442Y (zh) * 2005-04-25 2006-06-14 广东省东莞电机有限公司 一种风机用低噪声三相异步电动机
CN101552499A (zh) * 2009-05-14 2009-10-07 无锡市中达电机有限公司 一种变频电机转子冲片
CN201956850U (zh) * 2011-03-18 2011-08-31 四川埃姆克伺服科技有限公司 一种低电磁噪声交流异步伺服电机
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CN103683774A (zh) * 2013-12-12 2014-03-26 山东华力电机集团股份有限公司 一种10极三相异步电动机的低噪音定、转子冲片
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113765272A (zh) * 2021-09-01 2021-12-07 中山市普阳电子科技有限公司 一种塑封电机
CN113872350A (zh) * 2021-10-14 2021-12-31 广东美芝制冷设备有限公司 定子结构、电机结构、压缩机结构和制冷设备
CN113872350B (zh) * 2021-10-14 2023-08-01 广东美芝制冷设备有限公司 定子结构、电机结构、压缩机结构和制冷设备
CN114552911A (zh) * 2022-03-09 2022-05-27 上海电机系统节能工程技术研究中心有限公司 四六八极电机转子冲片设计方法
CN114552911B (zh) * 2022-03-09 2023-09-01 上海电机系统节能工程技术研究中心有限公司 四六八极电机转子冲片设计方法

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