WO2022016950A1 - Moteur électrique et compresseur d'air centrifuge - Google Patents

Moteur électrique et compresseur d'air centrifuge Download PDF

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Publication number
WO2022016950A1
WO2022016950A1 PCT/CN2021/091528 CN2021091528W WO2022016950A1 WO 2022016950 A1 WO2022016950 A1 WO 2022016950A1 CN 2021091528 W CN2021091528 W CN 2021091528W WO 2022016950 A1 WO2022016950 A1 WO 2022016950A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow channel
rotor
air
cooling
air flow
Prior art date
Application number
PCT/CN2021/091528
Other languages
English (en)
Chinese (zh)
Inventor
刘华
张治平
叶文腾
陈玉辉
Original Assignee
珠海格力电器股份有限公司
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 珠海格力电器股份有限公司 filed Critical 珠海格力电器股份有限公司
Publication of WO2022016950A1 publication Critical patent/WO2022016950A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof 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
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the 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
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present disclosure relates to the technical field of driving equipment, in particular to a motor and a centrifugal air compressor with dual cooling effects.
  • the rotor is affected by frequency conversion harmonics, and a lot of heat will be generated during operation, so that the temperature of the rotor magnet steel position is quite high, and the problem of demagnetization occurs when the magnet steel withstand temperature exceeds the temperature.
  • a motor with double cooling effect which adopts liquid cooling between the stator and the casing, and an air-cooled air flow enters the rotor cavity for cooling to improve the cooling effect. and centrifugal air compressors.
  • a motor including:
  • the shell is provided with an air inlet and an air outlet;
  • stator disposed inside the casing, and a rotor cavity is disposed in the stator;
  • the rotor is rotatably arranged inside the rotor cavity, and a gap is arranged between the rotor and the stator; the cooling circulation pipeline
  • the gas flow channel includes: an air inlet, a gap and an air outlet connected in sequence.
  • the casing is a cylindrical structure
  • the cooling circulation pipeline is spirally wound on the casing along the axis of the cylindrical structure.
  • the cooling circuit is provided between the housing and the stator.
  • the motor further includes a cooling cylinder
  • the cooling cylinder has a cylindrical structure
  • the cooling cylinder sleeve is arranged between the stator and the casing
  • the cooling circulation pipeline is arranged between the casing and the cooling cylinder.
  • the motor further includes two sealing rings, which are respectively provided at two ends of the cooling cylinder.
  • the cooling cartridge is an interference fit with the stator.
  • the motor further includes a support, the end of the rotor is disposed on the housing through the support, the air flow channel further includes an air flow channel arranged in the support, the first end of the air flow channel and the air inlet Or the air outlet is communicated, and the second end communicates with the gap.
  • the support has an end surface facing the rotor and a peripheral side surface perpendicular to the end surface, the first end of the airflow channel is arranged on the peripheral side surface, and the second end is arranged on the end surface.
  • the gas flow channel includes a radial flow channel and an axial flow channel that are communicated in sequence, an end of the radial flow channel away from the axial flow channel constitutes the first end, and an end of the axial flow channel away from the radial flow channel The second end is formed, and the axis of the axial flow channel has an included angle with the axis of the rotor.
  • the inclination direction of the included angle is the same as the rotation direction of the rotor.
  • the included angle ranges from 20° to 70°.
  • the gas flow channel further includes an annular flow channel disposed in the support, the annular flow channel is an annular groove surrounding the axis of the rotor, a first opening is provided on the peripheral side of the annular groove, and the annular groove is close to the gap A second opening is arranged on the end face of the hood, the first opening is communicated with the air inlet or the air outlet, and the second opening is communicated with the gap.
  • the first opening is arranged corresponding to the air inlet, or the first opening is arranged corresponding to the air outlet.
  • the longitudinal section of the annular groove is a trapezoid
  • the first opening is disposed on the oblique side of the trapezoid
  • the second opening is disposed on the upper base or the lower base of the trapezoid.
  • the number of airflow channels is multiple, and the number of airflow channels is proportional to the diameter of the motor.
  • all the air flow channels are evenly distributed in the support in an annular shape with the axis of the rotor as the centerline.
  • two supports including a left support and a right support, the air flow channel provided in the left support is the first air flow channel, and the air flow channel provided in the right support is a second air flow channel, one end of the first air flow channel is communicated with the air inlet, the other end is communicated with the gap, one end of the second air flow channel is communicated with the air outlet, and the other end is communicated with the gap; or
  • the air flow channel set in the right support is the first air flow channel
  • the air flow channel set in the left support is the second air flow channel.
  • One end of the first air flow channel is communicated with the air inlet, the other end is communicated with the gap, one end of the second air flow channel is communicated with the air outlet, and the other end is communicated with the gap.
  • a centrifugal air compressor includes the motor of the above embodiment.
  • FIG. 1 is a cross-sectional view of an electric machine of some embodiments of electric machines with dual cooling provided by the present disclosure
  • FIG. 2 is a schematic structural diagram of a support and a rotor of some embodiments of a motor with dual cooling effects provided by the present disclosure.
  • the motor includes a housing 1, a stator 2 and a rotor 3, the stator 2 is arranged inside the housing 1, a rotor cavity is arranged in the stator 2, and the rotor 3 is rotatable. It is arranged inside the rotor cavity, and a gap 4 is arranged between the rotor 3 and the stator 2.
  • a cooling circulation pipeline 5 is arranged on the casing 1, and an air inlet 6 and an air outlet 7 are arranged on the casing 1.
  • the air inlet 6, The gap 4 and the air outlet 7 are connected in sequence to form a gas flow channel.
  • the cooling circulation line 5 may be a liquid circulation line such as a water circulation line, or a gas circulation line.
  • a water-cooling system and an air-cooling system are simultaneously set inside the casing 1, and the heat of the casing 1 and the stator 2 is cooled by the water-cooling system, and the gas in the gas flow channel enters the rotor cavity, so as to realize the wire wrapping of the stator 2.
  • cooling, and optimize the effect of axial air supply fully cool the stator 2 and the rotor 3, the air flow enters the rotor cavity through the air inlet 6, and flows through the rotor 3 and the stator 2 through the gap 4, and finally is discharged from the air outlet 7.
  • the cooling inside the rotor 3 and the stator 2 overcomes the problem of uneven heat dissipation still existing in the prior art by water cooling or the combination of water cooling and air cooling.
  • the shell 1 is a cylindrical structure, and the cooling circulation line 5 is spirally wound on the inner side wall of the shell 1 along the axis of the cylindrical structure, so as to increase the distance of the cooling circulation line 5 flowing through the inner surface of the shell 1 as much as possible. , thereby increasing the cooling effect of the cooling circuit 5 .
  • the inner side wall of the housing 1 is provided with a spiral groove, and the cooling circulation pipe 5 is arranged in the groove, so as to improve the reliability of the fixing of the cooling circulation pipe 5 and reduce the radial dimension of the motor.
  • the cooling circulation line 5 is arranged between the casing 1 and the stator 2, which overcomes the problem that the cooling circulation pipe 5 can only be arranged outside the casing 1 in the prior art, and reduces the cooling circulation as much as possible.
  • the heat transfer path between the pipeline 5 and the stator 2 increases the cooling effect of the cooling circulation pipeline 5 .
  • the motor since the motor needs to be waterproofed to prevent the cooling water in the cooling circulation pipeline 5 from leaking or contacting the stator 2 to cause conduction, the motor further includes a cooling cylinder 8, and the cooling cylinder 8 has a cylindrical structure, and The cooling cylinder 8 is set between the outer surface of the stator 2 and the inner surface of the casing 1, and the cooling circulation pipeline 5 is set between the casing 1 and the cooling cylinder 8.
  • the cooling cylinder 8 is used to realize the The stator 2 is sealed and isolated, and the cooling cylinder 8 can also transfer the heat of the stator 2 to the cooling circulation pipeline 5 to achieve cooling.
  • the motor further includes a sealing ring, two ends of the cooling cylinder 8 are respectively provided with a sealing ring, and the sealing ring is used to realize the sealing between the cooling cylinder 8 and the casing 1, even if the cooling circulation pipeline 5 There is a problem of leakage, and the cooling water will also be stored between the cooling cylinder 8 and the housing 1 , and will not flow into the stator 2 or the rotor 3 .
  • the interference fit between the cooling tube 8 and the stator 2 not only ensures the effective fixation of the stator 2 , but also enables the heat of the stator 2 to be reliably transferred to the cooling tube 8 .
  • the motor further includes a support 10 , the end of the rotor 3 is disposed on the housing 1 through the support 10 , the support 10 is provided with a bearing, the rotor 3 is supported on the support 10 through the bearing, and the gas flows
  • the channel also includes an air flow channel arranged in the support 10, the first end of the air flow channel is communicated with the air inlet 6 or the air outlet 7, and the second end of the air flow channel is communicated with the gap 4, thereby introducing the cooling air into the rotor cavity.
  • a sealing ring is also provided between the support 10 and the casing 1 for sealing.
  • the support 10 has an end surface facing the rotor 3 and a peripheral side surface perpendicular to the end surface, the airflow channel is L-shaped, the first end of the airflow channel is arranged on the peripheral side surface, and the second end is arranged on the end surface so that the airflow can be directly blown to the stator 2, the rotor 3 and the gap 4 when entering the rotor cavity, so as to achieve effective cooling of the stator 2 and the rotor 3 by the cooling air, and the airflow enters a support from the air inlet 6 10, and then flows into the rotor cavity for cooling, and is forced to pass through the gap 4 to the other end of the rotor 3 under the squeezing action of the airflow pressure at the air inlet 6, and on the other support 10 Under the collection action of the air flow channel, it flows to the air outlet 7, and the motor is discharged to complete the cooling.
  • the air flow channel includes a radial flow channel 9 ′ and an axial flow channel 9 that are communicated in sequence, and an end of the radial flow channel 9 ′ away from the axial flow channel 9 constitutes the first end , the end of the axial flow channel 9 away from the radial flow channel 9' constitutes the second end, and the axis of the axial flow channel 9 and the axis of the rotor 3 have an included angle, and the included angle is an acute angle, that is, the axial flow channel 9
  • the air outlet direction is not directly towards the rotor cavity, but generates a certain inclination angle while blowing to the rotor cavity, which can ensure that the air flow out of the axial flow channel has a certain circumferential speed and axial speed, which can not only ensure the stator
  • the cooling of the enameled wire on the 2 and the cooling of the surface of the rotor 3 can also ensure that the resistance that the rotor 3 overcomes during operation is reduced, which is beneficial
  • an O-ring seal needs to be added between the end of the support 10 and the casing 1 to ensure sufficient air volume without leakage.
  • the inclination direction of the included angle is the same as the rotation direction of the rotor 3, and the outflow of the airflow channel is used to provide a certain thrust to the rotation of the rotor 3, which can not only ensure the cooling of the enameled wire and the surface of the rotor 3, but also provide a certain thrust to the rotation of the rotor 3. It is ensured that the resistance that the rotor 3 overcomes during operation is reduced, which is beneficial to indirectly reduce the heating of the motor.
  • the included angle ranges from 20° to 70°, for example, 45°.
  • the gas flow channel further includes an annular flow channel 11, the annular flow channel 11 is an annular groove provided in the support 10 and surrounding the axis of the rotor, and a first opening is provided on the peripheral side of the annular groove, And the end face of the annular groove facing the gap is provided with a second opening, the first opening is communicated with the air inlet 6 or the air outlet 7, the second opening is communicated with the gap 4, and the first opening, the annular groove and the second opening constitute an air flow channel, That is to say, the annular grooves are used to introduce the air intake from all the air inlets 6 into the annular grooves through the first opening for mixing, and then discharged through the second opening, so that the airflow entering the rotor cavity is uniform, and the heat dissipation of the rotor 3 and the stator 2 is increased. uniformity and heat dissipation.
  • the first opening is arranged corresponding to the air inlet 6, and the air is used to enter the rotor cavity for cooling after passing through the air inlet 6, the first opening, the annular groove and the second opening in sequence.
  • the first opening is arranged corresponding to the air outlet 7, and the gas is discharged from the motor through the second opening, the annular groove, the first opening and the air outlet 7 in sequence.
  • the longitudinal section of the annular groove is a trapezoid, and the first opening is arranged on the oblique side of the trapezoid, and the second opening is arranged on the upper bottom of the trapezoid or the lower bottom of the trapezoid, wherein the position of the second opening is according to the direction of the trapezoid toward the rotor cavity. It is determined that when the upper base of the trapezoid is directed to the gap, the second opening is provided at the upper base, and when the lower base of the trapezoid is directed to the gap, the second opening is provided at the lower base.
  • the number of airflow channels is multiple, and the number of airflow channels is proportional to the diameter of the motor, that is, the larger the diameter of the motor, the greater the number of airflow channels, and the ratio of the motor diameter to the number of airflow channels should be selected. Between 15-22, or the number of second openings is proportional to the diameter of the motor, when the diameter of the motor is larger, the number of second openings communicating with the gap is greater, thereby ensuring the heat dissipation effect of the motor.
  • All air flow passages are evenly distributed on the support 10 in an annular shape with the axis of the rotor 3 as the center line, that is, the radial flow passages 9' are annular, and all the axial flow passages 9 are connected to the annular radial flow passages. 9' is connected, and all the axial flow channels 9 are circularly distributed with the rotating shaft of the rotor 3 as the axis, ensuring that the air outlet end of the axial flow channel 9 exists in each position of the rotor cavity, and ensuring the uniformity of the stator 2 and the rotor 3. cool down.
  • the support 10 includes a left support and a right support, the air flow channel arranged in the left support is the first air flow channel, the air flow channel arranged in the right support is the second air flow channel, and the first air flow channel is the first air flow channel.
  • One end of the channel is communicated with the air inlet 6, the other end is communicated with the gap 4, one end of the second air flow channel is communicated with the air outlet 7, and the other end is communicated with the gap 4, that is, the cooling air enters the first air flow channel from the left support.
  • the support 10 includes a left support and a right support, the air flow channel provided in the right support is the first air flow channel, and the air flow channel provided in the left support is the second air flow
  • One end of the first air flow channel is communicated with the air inlet 6, the other end is communicated with the gap 4
  • one end of the second air flow channel is communicated with the air outlet 7, and the other end is communicated with the gap 4, that is, the cooling air is connected by the right branch.
  • the seat enters the first air flow channel, and flows into the rotor cavity under the action of all the axial flow channels 9 on the right support for cooling, and then passes through the gap 4 to the other end of the flow channel rotor 3, and passes through the other end of the flow channel on the left support. Under the action of the axial flow channel 9, the gas is collected and merged into the second air flow channel, and finally discharged from the air outlet 7 to complete the gas cooling process.
  • the cooling circulation pipe of the water circulation pipe is arranged between the stator and the casing, and the cooling circulation pipe of the water circulation pipe is spirally arranged, and the cooling circulation pipe of the water circulation pipe is added to the stator.
  • the air-cooled gas is introduced into the rotor cavity by setting the air flow channel, and the axial flow channel is set to have a certain inclination angle to achieve 360° annular blowing cooling.
  • the airflow in the axial flow channel The direction is the same as the rotation direction of the rotor, which can make the airflow generate a certain driving force on the rotor and reduce the working power consumption.
  • a centrifugal air compressor includes the above-mentioned motor.

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

Abstract

L'invention concerne un moteur électrique et un compresseur d'air centrifuge. Le moteur électrique comprend un boîtier, un stator et un rotor, le stator étant disposé dans le boîtier, le stator étant pourvu d'une cavité de rotor, le rotor étant disposé de manière rotative dans la cavité de rotor, et un espace étant prévu entre le rotor et le stator. Dans le moteur électrique à double effet de refroidissement et le compresseur d'air centrifuge, une conduite de circulation de refroidissement est disposée entre le stator et le boîtier, et la conduite de circulation de refroidissement est disposée en spirale, de telle sorte que le refroidissement efficace du stator par la conduite de circulation de refroidissement est augmenté. De plus, au moyen d'un canal d'écoulement d'air, un gaz de refroidissement d'air est acheminé dans la cavité de rotor, et un canal d'écoulement axial est conçu pour présenter un certain angle d'inclinaison, de telle sorte qu'un refroidissement par soufflage d'air annulaire à 360° est obtenu ; et la direction d'écoulement d'air du canal d'écoulement axial est la même que la direction de rotation du rotor, de telle sorte qu'un écoulement d'air peut générer une certaine force d'entraînement pour le rotor, ce qui permet de réduire la consommation d'énergie de travail.
PCT/CN2021/091528 2020-07-24 2021-04-30 Moteur électrique et compresseur d'air centrifuge WO2022016950A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010725469.7 2020-07-24
CN202010725469.7A CN111864990A (zh) 2020-07-24 2020-07-24 具有双重冷却效果的电机及离心空压机

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WO2022016950A1 true WO2022016950A1 (fr) 2022-01-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11594920B2 (en) 2020-09-21 2023-02-28 Evr Motors Ltd Electric machine with liquid-cooled stator core
CN116961319A (zh) * 2023-09-21 2023-10-27 中达电机股份有限公司 真空泵用永磁电机转子冷却系统
US12046949B1 (en) 2023-12-28 2024-07-23 Evr Motors Ltd Electric machine with coils bridged with toothed clips
US12081073B2 (en) 2021-10-04 2024-09-03 Evr Motors Ltd Electric machine with multi-tapered yokes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111864990A (zh) * 2020-07-24 2020-10-30 珠海格力电器股份有限公司 具有双重冷却效果的电机及离心空压机
CN112761973A (zh) * 2021-01-08 2021-05-07 西安交通大学 一种超高速永磁电机驱动的氮气压缩机结构
CN114389398A (zh) * 2022-01-19 2022-04-22 湖南中车尚驱电气有限公司 一种扩压端盖及电机

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US20050151431A1 (en) * 2004-01-14 2005-07-14 Caterpillar Inc. Cooling system for an electric motor
CN1745509A (zh) * 2003-01-29 2006-03-08 森德奈公司 旋转机械冷却系统
CN202183694U (zh) * 2011-08-18 2012-04-04 南阳防爆集团股份有限公司 一种机壳水冷式风力发电机冷却结构
CN208862675U (zh) * 2018-10-10 2019-05-14 湖北同发机电有限公司 一种无刷同步发电机
CN210958009U (zh) * 2020-05-21 2020-07-07 稳力(广东)科技有限公司 混合冷却电机
CN111864990A (zh) * 2020-07-24 2020-10-30 珠海格力电器股份有限公司 具有双重冷却效果的电机及离心空压机

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CN1745509A (zh) * 2003-01-29 2006-03-08 森德奈公司 旋转机械冷却系统
US20050151431A1 (en) * 2004-01-14 2005-07-14 Caterpillar Inc. Cooling system for an electric motor
CN202183694U (zh) * 2011-08-18 2012-04-04 南阳防爆集团股份有限公司 一种机壳水冷式风力发电机冷却结构
CN208862675U (zh) * 2018-10-10 2019-05-14 湖北同发机电有限公司 一种无刷同步发电机
CN210958009U (zh) * 2020-05-21 2020-07-07 稳力(广东)科技有限公司 混合冷却电机
CN111864990A (zh) * 2020-07-24 2020-10-30 珠海格力电器股份有限公司 具有双重冷却效果的电机及离心空压机

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11594920B2 (en) 2020-09-21 2023-02-28 Evr Motors Ltd Electric machine with liquid-cooled stator core
US11831202B2 (en) 2020-09-21 2023-11-28 Evr Motors Ltd Electric machine with multi-part trapezoidal teeth
US12081073B2 (en) 2021-10-04 2024-09-03 Evr Motors Ltd Electric machine with multi-tapered yokes
CN116961319A (zh) * 2023-09-21 2023-10-27 中达电机股份有限公司 真空泵用永磁电机转子冷却系统
CN116961319B (zh) * 2023-09-21 2023-11-21 中达电机股份有限公司 真空泵用永磁电机转子冷却系统
US12046949B1 (en) 2023-12-28 2024-07-23 Evr Motors Ltd Electric machine with coils bridged with toothed clips

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