CN108258849A - A kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling - Google Patents

A kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling Download PDF

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Publication number
CN108258849A
CN108258849A CN201810098430.XA CN201810098430A CN108258849A CN 108258849 A CN108258849 A CN 108258849A CN 201810098430 A CN201810098430 A CN 201810098430A CN 108258849 A CN108258849 A CN 108258849A
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CN
China
Prior art keywords
permanent magnet
motor
totally
cooling
casing
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Granted
Application number
CN201810098430.XA
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Chinese (zh)
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CN108258849B (en
Inventor
杜光辉
徐伟
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/08Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/20Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/02Casings or enclosures characterised by the material thereof
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/02Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

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

Abstract

The invention belongs to technical field of motors, and disclose a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling.The magneto includes motor case, the stator and rotor being arranged in casing, and it is arranged on the end cap of casing rear and front end, tuyere shell is both provided on the end cap of rear and front end, pipeline air inlet and pipeline air outlet are set respectively on the tuyere shell of rear and front end, simultaneously, tunnel inlet and ducting outlet are correspondingly provided on the end cap of rear and front end, pipeline air outlet is connected with pipeline air inlet, form gas circulating in motor, in addition, multiple mouth sprays being distributed along casing excircle are provided on the side of casing front end, the mouth spray is used to cool down the gas entered from tunnel inlet, the cooling liquid sprayed in the mouth spray is held high for fluorine chlorine, R123, R245 or R141.By the present invention, motor temperature is effectively reduced, it is excessively high to solve the problems, such as that totally-enclosed high-speed permanent magnet motor temperature is high, heat dissipation is difficult, rotor temperature rises part.

Description

A kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling
Technical field
The invention belongs to technical field of motors, more particularly, to a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling.
Background technology
For high-speed electric expreess locomotive due to rotating speed height, power density is big, small, can effectively save material;Due to rotary inertia It is smaller, so dynamic response is very fast;High-speed electric expreess locomotive can be connected directly with working machine or load, eliminate traditional mechanical speed change dress It puts, thus noise can be reduced and improve the efficiency of transmission system.The research of high-speed electric expreess locomotive meets the economy of energy-saving and emission-reduction with application Development need has become one of the research hotspot in International Power field at present, in high speed grinding machine, air circulation refrigeration system, storage Energy flywheel, high speed centrifugation compressor, air blower, aerospace etc. are with a wide range of applications.
Magneto with its is simple in structure, power energy density is high, without excitation loss, it is efficient the advantages that, be best suited at a high speed Motor.High-speed high frequency motor design difficulty compared with common electric machine is larger, and high-speed electric expreess locomotive rotating speed is up to tens thousand of turns per minute even Ten tens of thousands of turns, peripheral speed up to more than 200m/s, motor under the circumference of the high-speed rotation, the friction meeting of air and rotor surface Very big loss is brought to motor, the eddy-current loss of rotor permanent magnet also can be very big, while for high-speed permanent magnet motor, stator Core loss and winding loss are all up to thousands of watts of even upper myriawatts, cause motor temperature rise excessively high, in particular for rotor, due to During high speed rotation, permanent magnet cannot bear huge centrifugal force, it is necessary to take safeguard measure, common safeguard measure is permanent magnet Outer embedded alloy sleeve ties up carbon fiber sheath, and alloy sleeve can generate very big whirlpool since conductivity is larger in sheath Stream loss, although carbon fiber sheath conductivity is very low, can to avoid larger rotor eddy current loss, but carbon fiber sheath is hot Non-conductor, thermal conduction characteristic is very poor, and rotor heat is difficult to shed, and for high-speed electric expreess locomotive, and rotor volume very little particularly turns Son is added in after protective case, and very big difficulty is brought, and totally enclosed air compressor, steamer are sent out to the heat dissipation of rotor Motor and cogeneration machine, since gas temperature is higher, the gas temperature into motor is up to 70 degree or more, to dissipating for motor Heat brings great difficulty, and irreversible demagnetization can occur in the case where temperature is excessively high for permanent magnet, causes seriously to endanger to motor Evil, therefore the heat dissipation of motor is as one of key problem of design of electrical motor.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of totally-enclosed high speeds of Liquid injection cooling Magneto by cooling air channel and outer cooling air channel in being set inside motor, is filled with from outside motor to motor inside Gas carries out circulating cooling to motor, thus solves the totally-enclosed system such as steam turbine generator, cogeneration machine, air compressor and uses High-speed permanent magnet motor, small, heat dissipation is difficult and the technical issues of hot-spot.
To achieve the above object, it is proposed, according to the invention, provide a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling, this is forever Magneto includes motor case, the stator and rotor that are arranged in casing and the end cap for being arranged on casing rear and front end, feature It is, tuyere shell is both provided on the end cap of rear and front end, pipeline air inlet is set respectively on the tuyere shell of rear and front end With pipeline air outlet, meanwhile, be correspondingly provided with tunnel inlet and ducting outlet on the end cap of rear and front end, pipeline air outlet and pipe Road air inlet connection, forms gas circulating in motor, in addition, being provided on the side of casing front end multiple along casing The mouth spray of excircle distribution, the mouth spray are used to cool down the high-temperature gas entered from tunnel inlet.
Preferably, the rotor includes rotor core, permanent magnet and protective case, and permanent magnet is attached in rotor core, protects The periphery of permanent magnet is sleeved on, rotor core is shaft.
Preferably, in the tuyere shell of front end, impeller is provided in the rotor core of rotor, gas after impeller, It flows into inside motor, forms full-closed structure.
Preferably, the stator includes stator core and stator winding, and stator winding is arranged in stator core, stator around Interior cooling air channel is provided between group and rotor periphery.
Preferably, the periphery of the stator core is provided with copper coin, and outer cooling air channel, the outer cooling air channel are formed with casing For helical form or axial ducts.
Preferably, mouth spray is also equipped on the end cap of the front end, for further cooling down.
Preferably, the casing uses carbon steel, and the protection cover material preferably uses carbon fiber.
Preferably, the casing uses carbon steel, and the protection cover material preferably uses carbon fiber.
By the above technical scheme conceived by the present invention compared with prior art, following advantageous effect can be obtained:
1st, the temperature of the gas of motor center is higher in the present invention, and up to 70 degree or more, pole is brought to the heat dissipation of motor The problem of big difficulty, using method provided by the invention, winding and permanent magnet problem are effectively reduced, avoids local temperature mistake The problem of high, is effectively increased motor reliability and service life;
2nd, the present invention is by using cooling wind in cooling air channel outside motor air inlet hydrojet structure, casing copper coin and stator slot The cooling scheme that road is combined using full-closed structure, makes full use of turbine generator system, afterheat generating system, air compression The evaporation medium of system etc. itself, due to above totally-enclosed system, the temperature of boil-off gas is higher, and pressure is larger, these high temperature Gas is directly entered inside motor, extremely limited to the heat dissipation effect of motor, can cause the temperature office of winding and rotor in motor Portion is excessively high, and scheme using the present invention effectively solves the problems, such as these;
3rd, the present invention opens up mouth spray on air inlet casing, spray low-boiling fluorine chlorine hold high, the media such as R245, be situated between above The boiling point of matter is generally below 30 DEG C under high pressure, and by being contacted with high-temperature gas, liquid is undergone phase transition, so as to make air inlet gas Temperature substantially reduces and more uniformly, substantially reduces the temperature of motor cooling medium, greatly improve the cooling of motor Effect reduces the temperature of motor;
4th, the present invention forms the outside cooling air channel of axis, due to copper by setting copper coin in motor stator periphery with casing Thermal conduction characteristic is very high, and effectively the heat of stator core and stator winding by copper axial ducts can be taken away, make stator iron The heart reaches good heat dissipation effect;
5th, the present invention not only can further be dissipated by opening up axial ducts in stator slot simultaneously to stator winding Heat can also radiate to rotor, the rotor of motor be made to reach good heat dissipation effect, high-temperature gas passes through motor tunnel inlet Into motor, by hydrojet structure, make the reduction that gas temperature is larger, low-temperature mixed gas flows through stator copper axial ducts and slot Interior axial ducts, after taking away electric machine rotor heat, the flow direction motor other end, the air outlet inflow gas pipe through the motor other end Road by condensing and evaporating and retracting device, recycles;
6th, present invention seek to address that the totally-enclosed system such as steam turbine generator, cogeneration machine, air compressor is used at a high speed forever Magneto, it is small, coolant temperature is high, heat dissipation is difficult, temperature rise it is excessively high and seriously affect motor reliability and service life The problem of.
Description of the drawings
Fig. 1 is the structure of the totally-enclosed high-speed permanent magnet motor of the Liquid injection cooling constructed by preferred embodiment according to the invention Schematic diagram;
Fig. 2 is the radial direction of the totally-enclosed high-speed permanent magnet motor of the Liquid injection cooling constructed by preferred embodiment according to the invention Sectional view;
Fig. 3 is that the outer cooling air duct construction of the copper coin and casing composition constructed by preferred embodiment according to the invention is illustrated Figure;
Fig. 4 is the mouth spray structural representation on the casing of the Liquid injection cooling constructed by preferred embodiment according to the invention Figure.
In all the appended drawings, identical reference numeral is used for representing identical element or structure, wherein:
1. high pressure liquid spray mouth, 2. motor cases, 3. outer cooling air channels, 4. copper coins, 5. stator cores, 6. stator winding, 7. Interior cooling air channel, 8. protective cases, 9. permanent magnets, 10. rotor cores, 11. winding overhangs, 12. electric motor end caps, 13. ducting outlets, 14. bearing, 15. tunnel inlets, 16. impellers, 17. tuyere shells, 18. pipeline air inlets, 19. pipeline air outlets,
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below It does not constitute a conflict with each other and can be combined with each other.
The present invention is a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling, using setting mouth spray 1, fixed on motor housing The cooling scheme that cooling air channel 7 is combined in the outer cooling air channel 3 of son and stator slot, motor case 2 are determined with being arranged in casing 7 Son and rotor, casing 2 are provided at both ends with end cap 12, and stator includes stator core 5, stator winding 6, and rotor includes rotor core 10th, permanent magnet 9 and protective case 8, rotor protection set 8 are carbon fiber sheath.Rotor one end is provided with impeller 16, impeller There is tuyere shell 17 outside, air outlet shell 17, tuyere shell 17 and motor machine are also equipped with outside the other end end cap 12 of motor Shell 2 is connected, and offers motor air inlet 15 on motor one end end cap 12, motor outlet air is offered in motor other end end cap 12 Mouth 13, tunnel inlet 15 is connected with ducting outlet 13 with pipeline air inlet 18 with pipeline air outlet 19 respectively, pipeline air outlet 19 are connected with external pipe.Multiple high pressure liquid spray mouths 1 are offered on the casing 2 of 15 side of tunnel inlet, high pressure liquid spray mouth 1 Nozzle is deep near the tunnel inlet 15 inside motor, and the arrival end of high pressure liquid spray mouth 1 is outside casing 2, with outside liquid Device connects, and mouth spray 1 can be opened on the casing 2 of entrance side and the end cap 12 of entrance side, mouth spray 1 into circle distribution, 1 jetting liquid of mouth spray is low-boiling point liquid, can be held high for fluorine chlorine, R123, R245, R141, and 5 outside setting of stator core is by copper coin The outer cooling duct 3 of stator of 4 compositions, copper coin 4 are interference fitted with stator core 5, and outer 3 outside setting of cooling duct is by carbon steel group Into casing 2, outer cooling duct 3 can be helical form air duct and axial ducts, and cooling medium is evaporated with system in outer cooling duct 3 Medium is identical, can be air, freon, R245, R123 etc..The inside air duct of axis is provided between stator winding 6 and rotor periphery 7,7 be gas cooling in the inside air duct of axis, and cooling medium is the gas in system pipeline, can be air, freon, R245, R123 etc..High-temperature gas is rotated by external pipe through 18 impeller 16 of pipeline air inlet, by motor tunnel inlet 15 into Enter inside motor, air path system is divided into two-way, all the way by cooling air channel outside stator 3, stator heat is taken away, all the way by stator The inside cooling air channel 7 of slot inner shaft, takes away winding and rotor heat, while the flow direction motor other end, from the motor of the motor other end 13 inflow gas pipeline air outlet 19 of ducting outlet, gas pipeline air outlet 19 is connected with external pipe, and gas is using cold Solidifying and evaporation, recycles.
The cooling side that the present invention is combined using cooling air channel 7 in high pressure liquid spray mouth 1, the outer cooling air channel 3 of stator and stator Case using full-closed structure, can make full use of turbine generator system, afterheat generating system, air compression system, biology hair The evaporation medium of electricity, geothermal power generation etc. itself, due to above totally-enclosed system, the temperature of boil-off gas is higher, and pressure is larger, this A little high-temperature gases are directly entered inside motor, extremely limited to the heat dissipation effect of motor, can cause the temperature of stator winding 6 and rotor Degree part is excessively high, and the present invention in 2 outer both sides of motor case there is provided tuyere shell 17, and with the tunnel inlet 15 on casing 2 Be connected with ducting outlet 13, turbine generator system, afterheat generating system, air compression system high-temperature medium, pass through casing Tunnel inlet 15 into inside motor, opens up multiple high pressure liquid spray mouths 1 on 15 casing of casing upper air duct entrance, sprays low boiling The media such as the fluorine chlorine of point is held high, R245, the boiling point of more than medium is generally below 30 DEG C under high pressure, by being contacted with high-temperature gas, Liquid is undergone phase transition, so as to substantially reduce 15 gas temperature of tunnel inlet and more uniformly, make the temperature of motor cooling medium Degree substantially reduces, and greatly improves the cooling effect of motor, reduces the temperature of motor.Meanwhile outside electric machine stator iron 5 It opening up outer cooling air channel 3 and adds copper coin 4, outer cooling duct 3 is made of copper coin and casing, since the thermal conduction characteristic of copper is very high, Can the heat of stator core 4 and stator winding 5 be effectively passed to outer cooling air channel 3 by copper coin 4, so as to take away heat, Stator core 4 is made to reach good heat dissipation effect, while interior cooling air channel 7 is opened up in stator slot, can not only be given further It radiates to stator winding 6, can also radiate to rotor, the rotor of motor is made to reach good heat dissipation effect.High-temperature gas leads to Motor tunnel inlet 15 is crossed into motor, by mouth spray 1, makes the reduction that gas temperature is larger, low-temperature mixed gas flows through outer Cooling air channel 3 and interior cooling air channel 7, after taking away electric machine rotor heat, the flow direction motor other end, the air duct through the motor other end Outlet 13 and pipeline air outlet 19 flow into system Outer Tube, by condensing and evaporating and retracting device, recycle.The present invention is logical It crosses using the cooling that cooling air channel 7 is combined in motor air inlet high pressure liquid spray mouth 1, the outer cooling air channel 3 of stator copper and stator slot Scheme can effectively solve the totally-enclosed system high-speed permanent magnetic electricity such as steam turbine generator, cogeneration machine, air compressor Machine, small, heat dissipation is difficult, and the temperature of gas is higher, and up to 70 degree or more, great difficulty is brought to the heat dissipation of motor The problem of problem can effectively reduce permanent magnet and winding temperature, effectively raise motor reliability and service life.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, all any modification, equivalent and improvement made all within the spirits and principles of the present invention etc., should all include Within protection scope of the present invention.

Claims (8)

1. a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling, which includes motor case (2), is arranged on casing (2) stator in is with rotor and is arranged on the end cap (12) of casing (2) rear and front end, which is characterized in that the rear and front end End cap on be both provided with tuyere shell (17), pipeline air inlet (18) and pipeline are set respectively on the tuyere shell of rear and front end Air outlet (19), meanwhile, tunnel inlet (15) and ducting outlet (13), pipeline are correspondingly provided on the end cap of the rear and front end Air outlet is connected with pipeline air inlet, gas circulating in motor is formed, in addition, being set on the side of the casing front end Be equipped with multiple mouth sprays (1) being distributed along casing excircle, the mouth spray be used for from the high-temperature gas that tunnel inlet enters into Row cooling.
A kind of 2. totally-enclosed high-speed permanent magnet motor of Liquid injection cooling as described in claim 1, which is characterized in that the rotor packet Rotor core (10), permanent magnet (9) and protective case (8) are included, permanent magnet (9) is attached in rotor core (10), and protective case (8) is sleeved on The periphery of permanent magnet, rotor core (10) are shaft.
A kind of 3. totally-enclosed high-speed permanent magnet motor of Liquid injection cooling as claimed in claim 2, which is characterized in that the wind in front end In mouth shell (17), impeller (16) is provided in the rotor core of rotor, gas is flowed into after impeller (16) inside motor, Form full-closed structure.
4. such as a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling of claim 1-3 any one of them, which is characterized in that institute It states stator and includes stator core (5) and stator winding (6), stator winding is arranged in stator core, stator winding (5) and rotor Interior cooling air channel (7) is provided between periphery.
5. such as a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling of claim 1-4 any one of them, which is characterized in that institute The periphery for stating stator core is provided with copper coin (4), and outer cooling air channel (3) is formed with casing, the outer cooling air channel be helical form or Axial ducts.
6. such as a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling of claim 1-5 any one of them, which is characterized in that institute It states and mouth spray (1) is also equipped on the end cap of front end, for further cooling down.
7. such as a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling of claim 1-6 any one of them, which is characterized in that institute State the cooling liquid that is sprayed in mouth spray held high for fluorine chlorine, R123, R245 or R141.
8. such as a kind of totally-enclosed high-speed permanent magnet motor of Liquid injection cooling of claim 1-7 any one of them, which is characterized in that institute Casing is stated using carbon steel, the protection cover material preferably uses carbon fiber.
CN201810098430.XA 2018-01-31 2018-01-31 Liquid-spraying-cooled totally-enclosed high-speed permanent magnet motor Active CN108258849B (en)

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Cited By (7)

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CN109120104A (en) * 2018-09-28 2019-01-01 北京金风科创风电设备有限公司 Wind generating set, motor and air flow conveying device of motor air gap
CN109474122A (en) * 2018-12-14 2019-03-15 哈尔滨理工大学 A kind of latent liquid type LNG pump low-temperature and high-speed motor
CN109831054A (en) * 2019-03-15 2019-05-31 广东索特能源科技有限公司 A kind of motor with cooling system
CN111756178A (en) * 2020-06-11 2020-10-09 珠海格力电器股份有限公司 Motor radiating assembly and EC motor
CN112564417A (en) * 2019-09-26 2021-03-26 襄阳中车电机技术有限公司 New energy automobile permanent magnet motor
US20210317835A1 (en) * 2020-04-09 2021-10-14 Hamilton Sundstrand Corporation Cooling system for electric machines
CN113708550A (en) * 2021-09-14 2021-11-26 威海西立电子有限公司 Electric machine

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CN205960857U (en) * 2016-08-02 2017-02-15 天津飞旋科技研发有限公司 Take pure forced -air cooling heat dissipation structure of magnetic levitation motor of two impellers
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CN206834932U (en) * 2017-04-27 2018-01-02 重庆合众电气工业有限公司 Closed type centrifugal refrigerating motor stator coil end spraying cooling structure
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US11855511B2 (en) 2018-09-28 2023-12-26 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Wind power generation unit, electric motor, and airflow delivery device for electric motor air gap
CN109474122A (en) * 2018-12-14 2019-03-15 哈尔滨理工大学 A kind of latent liquid type LNG pump low-temperature and high-speed motor
CN109831054A (en) * 2019-03-15 2019-05-31 广东索特能源科技有限公司 A kind of motor with cooling system
CN109831054B (en) * 2019-03-15 2024-03-12 广东索特能源科技有限公司 Motor with cooling system
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CN111756178B (en) * 2020-06-11 2023-04-28 珠海格力电器股份有限公司 Motor heat dissipation assembly and EC motor
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