CN108258849B - Liquid-spraying-cooled totally-enclosed high-speed permanent magnet motor - Google Patents
Liquid-spraying-cooled totally-enclosed high-speed permanent magnet motor Download PDFInfo
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- CN108258849B CN108258849B CN201810098430.XA CN201810098430A CN108258849B CN 108258849 B CN108258849 B CN 108258849B CN 201810098430 A CN201810098430 A CN 201810098430A CN 108258849 B CN108258849 B CN 108258849B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
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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
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
-
- 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
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements 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 the technical field of motors, and discloses a liquid-jet-cooled totally-enclosed high-speed permanent magnet motor. This permanent-magnet machine includes the motor casing, stator and rotor of setting in the casing, and set up the end cover at both ends around the casing, all be provided with the wind gap shell on the end cover at both ends around, set up pipeline air intake and pipeline air outlet on the wind gap shell at both ends around respectively, and simultaneously, be provided with wind channel entry and wind channel export on the end cover at both ends around correspondingly, pipeline air outlet and pipeline air intake intercommunication, form the circulation flow of gas in the motor, in addition, be provided with a plurality of hydrojet mouths that distribute along the casing outer circumference on the side of casing front end, this hydrojet mouth is used for cooling the gas that gets into from the wind channel entry, the spun cooling liquid is freon in this hydrojet mouth, R123, R245 or R141. The invention effectively reduces the temperature of the motor and solves the problems of high temperature, difficult heat dissipation and local overhigh temperature rise of the stator and the rotor of the totally-enclosed high-speed permanent magnet motor.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a liquid-jet-cooled totally-enclosed high-speed permanent magnet motor.
Background
The high-speed motor has high rotating speed, high power density and small volume, so that materials can be effectively saved; the dynamic response is faster due to the smaller moment of inertia; the high speed motor can be directly connected to the working machine or the load, eliminating the conventional mechanical speed change device, thereby reducing noise and improving the efficiency of the transmission system. The research and application of the high-speed motor meet the economic development requirements of energy conservation and emission reduction, become one of the research hotspots in the international electrotechnical field at present, and have wide application prospects in high-speed grinding machines, air circulation refrigeration systems, energy storage flywheels, high-speed centrifugal compressors, blowers, aerospace and the like.
The permanent magnet motor has the advantages of simple structure, high force energy density, no excitation loss, high efficiency and the like, and is most suitable for a high-speed motor. Compared with the common motor, the high-speed high-frequency motor has higher design difficulty, the rotating speed of the high-speed motor reaches tens of thousands of revolutions per minute or even hundreds of thousands of revolutions, the peripheral speed can reach more than 200m/s, the friction between air and the surface of a rotor can bring great loss to the motor under the condition of high-speed rotation of the motor, the eddy current loss of a rotor permanent magnet can also be great, meanwhile, for the high-speed permanent magnet motor, the loss of a stator core and the loss of a winding can both reach thousands of watts or even tens of thousands of watts, so that the temperature rise of the motor is overhigh, particularly for the rotor, because the permanent magnet can not bear huge centrifugal force during high-speed rotation, protective measures must be taken, the commonly used protective measures are to embed an alloy sheath or tie up a carbon fiber sheath outside the permanent magnet, the alloy sheath can generate great eddy current loss in the sheath due to higher conductivity, although the carbon fiber, however, the carbon fiber sheath is a poor heat conductor, the heat conduction characteristic is poor, the heat of the rotor is difficult to dissipate, the rotor volume is small for a high-speed motor, particularly after the rotor is added with the protective sleeve, great difficulty is brought to the heat dissipation of the rotor, and for a totally-enclosed air compressor, a turbonator and a waste heat generator, the temperature of gas entering the motor is as high as more than 70 ℃ due to high gas temperature, great difficulty is brought to the heat dissipation of the motor, irreversible demagnetization can occur to a permanent magnet under the condition of overhigh temperature, serious damage is caused to the motor, and the heat dissipation of the motor becomes one of the core problems of motor design.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a liquid-jet-cooled totally-enclosed high-speed permanent magnet motor, which is characterized in that an inner cooling air duct and an outer cooling air duct are arranged in the motor, and gas is filled into the motor from the outside of the motor to circularly cool the motor, so that the technical problems of small volume, difficult heat dissipation and local overheating of the high-speed permanent magnet motor for totally-enclosed systems such as a turbonator, a waste heat generator, an air compressor and the like are solved.
In order to achieve the purpose, the invention provides a liquid spray cooled totally-enclosed high-speed permanent magnet motor, which comprises a motor shell, a stator and a rotor arranged in the motor shell, and end covers arranged at the front end and the rear end of the motor shell.
Preferably, the rotor comprises a rotor core, a permanent magnet and a protective sleeve, the permanent magnet is attached to the rotor core, the protective sleeve is sleeved on the periphery of the permanent magnet, and the rotor core is a rotating shaft.
Preferably, an impeller is arranged on a rotor core of the rotor in the tuyere housing at the front end, and gas flows into the motor after passing through the impeller to form a fully-closed structure.
Preferably, the stator comprises a stator core and a stator winding, the stator winding is arranged on the stator core, and an internal cooling air duct is arranged between the stator winding and the periphery of the rotor.
Preferably, a copper plate is arranged on the periphery of the stator core, and forms an external cooling air duct with the casing, and the external cooling air duct is a spiral or axial air duct.
Preferably, the end cover of the front end is also provided with a liquid spraying port for further cooling.
Preferably, the casing is made of carbon steel, and the protective sleeve material is preferably made of carbon fiber.
Preferably, the casing is made of carbon steel, and the protective sleeve material is preferably made of carbon fiber.
Compared with the prior art, the technical scheme of the invention can obtain the following beneficial effects:
1. the temperature of the gas in the center of the motor is high and can reach more than 70 ℃, so that great difficulty is brought to heat dissipation of the motor;
2. according to the invention, by adopting a cooling scheme of combining a liquid spraying structure at the air inlet of the motor, an external cooling air channel of a copper plate of a shell and an internal cooling air channel of a stator slot, and adopting a totally-enclosed structure, self evaporation media of a steam turbine power generation system, a waste heat power generation system, an air compression system and the like are fully utilized, and because of the totally-enclosed structure, the temperature of evaporation gas is higher, the pressure is higher, the high-temperature gas directly enters the motor, the heat dissipation effect on the motor is extremely limited, and the local overhigh temperature of a winding and a rotor in the motor can be caused, and the problems are effectively solved by;
3. the air inlet shell is provided with the liquid spraying port, and low-boiling point Freon, R245 and other media are sprayed, the boiling point of the media is generally lower than 30 ℃ under high pressure, and the liquid is in phase change through contact with high-temperature gas, so that the temperature of the gas at the air inlet is greatly reduced and more uniform, the temperature of a cooling medium of the motor is greatly reduced, the cooling effect of the motor is greatly improved, and the temperature of the motor is reduced;
4. according to the invention, the copper plate is arranged on the periphery of the motor stator and forms an axial external cooling air channel with the shell, and the heat of the stator core and the stator winding can be effectively taken away through the copper axial air channel due to the high heat conduction property of copper, so that the stator core achieves a good heat dissipation effect;
5. according to the invention, the axial air duct is arranged in the stator slot, so that heat can be further dissipated to the stator winding and the rotor, the stator and the rotor of the motor can achieve good heat dissipation effect, high-temperature gas enters the motor through the air duct inlet of the motor, the temperature of the gas is greatly reduced through the liquid spraying structure, low-temperature mixed gas flows through the stator copper axial air duct and the axial air duct in the slot, flows to the other end of the motor after taking away the heat of the stator and the rotor of the motor, flows into the gas pipeline through the air outlet at the other end of the motor, and is recycled through the condensation, evaporation and recovery device;
6. the invention aims to solve the problems that the high-speed permanent magnet motor for a totally-enclosed system such as a turbonator, a waste heat generator, an air compressor and the like has small volume, high temperature of a cooling medium, difficult heat dissipation and overhigh temperature rise and seriously influences the reliability and the service life of the motor.
Drawings
FIG. 1 is a schematic diagram of a spray cooled fully enclosed high speed permanent magnet machine constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a radial cross-sectional view of a spray cooled fully enclosed high speed permanent magnet machine constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic view of an external cooling air duct structure composed of copper plates and a machine shell according to a preferred embodiment of the present invention;
fig. 4 is a schematic view of a liquid discharge port in a liquid discharge cooled enclosure constructed in accordance with a preferred embodiment of the invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1. a high-pressure liquid spraying port, 2, a motor shell, 3, an external cooling air duct, 4, a copper plate, 5, a stator iron core, 6, a stator winding, 7, an internal cooling air duct, 8, a protective sleeve, 9, a permanent magnet, 10, a rotor iron core, 11, a winding end part, 12, a motor end cover, 13, an air duct outlet, 14, a bearing, 15, an air duct inlet, 16, an impeller, 17, an air duct shell, 18, a pipeline air inlet, 19, a pipeline air outlet,
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention relates to a liquid-jet-cooled totally-enclosed high-speed permanent magnet motor, which adopts a cooling scheme that a motor shell is provided with a liquid jet port 1, a stator external cooling air duct 3 and a stator in-slot cooling air duct 7 which are combined, a motor shell 2, a stator and a rotor are arranged in the shell 7, two ends of the shell 2 are provided with end covers 12, the stator comprises a stator core 5 and a stator winding 6, the rotor comprises a rotor core 10, a permanent magnet 9 and a protective sleeve 8, and the rotor protective sleeve 8 is a carbon fiber protective sleeve. An impeller 16 is arranged at one end of a motor rotor, an air inlet shell 17 is arranged outside the impeller, an air outlet shell 17 is also arranged outside an end cover 12 at the other end of the motor, the air inlet shell 17 is connected with a motor shell 2, a motor air inlet 15 is arranged on the end cover 12 at one end of the motor, a motor air outlet 13 is arranged on the end cover 12 at the other end of the motor, an air inlet 15 and an air outlet 13 of the air channel are respectively communicated with a pipeline air inlet 18 and a pipeline air outlet 19, and the pipeline air outlet 19 is communicated with an. The motor comprises a shell 2 on the side of an air duct inlet 15, a plurality of high-pressure liquid spraying ports 1 are formed in the shell 2 on the side of the air duct inlet 15, spray heads of the high-pressure liquid spraying ports 1 penetrate into the position close to the air duct inlet 15 inside the motor, the inlet end of the high-pressure liquid spraying ports 1 is arranged outside the shell 2 and connected with an external liquid device, the liquid spraying ports 1 can be formed in the shell 2 on the inlet side and an end cover 12 on the inlet side, the liquid spraying ports 1 are distributed in a circumferential mode, liquid sprayed by the liquid spraying ports 1 is low-boiling-point liquid and can be Freon, R123, R245 and R141, a stator outer cooling channel 3 composed of copper plates 4 is arranged outside a stator iron core 5, the copper plates 4 are in interference fit with the stator iron core 5, the shell 2 composed of carbon steel is arranged outside the outer cooling channel 3 and can be a spiral air duct and an axial air duct, and a cooling medium in the outer cooling channel 3 is. An axial inner air channel 7 is arranged between the stator winding 6 and the periphery of the rotor, the axial inner air channel 7 is used for cooling air, and a cooling medium is gas in a system pipeline and can be air, Freon, R245, R123 and the like. High-temperature gas drives an impeller 16 to rotate through an external pipeline through a pipeline air inlet 18 and enters the motor through a motor air channel inlet 15, an air path system is divided into two paths, one path of high-temperature gas passes through a stator external cooling air channel 3 and takes away stator heat, the other path of high-temperature gas passes through a stator in-slot axial internal cooling air channel 7 and takes away winding and rotor heat and flows to the other end of the motor, the high-temperature gas flows into a gas pipeline air outlet 19 from a motor air channel outlet 13 at the other end of the motor, the gas pipeline air outlet 19 is connected with the external pipeline, and the gas is condensed and.
The invention adopts a cooling scheme of combining a high-pressure liquid spraying port 1, a stator external cooling air duct 3 and a stator internal cooling air duct 7, adopts a totally-enclosed structure, can fully utilize self evaporation media of a steam turbine power generation system, a waste heat power generation system, an air compression system, biological power generation, geothermal power generation and the like, and because of the totally-enclosed system, the temperature and the pressure of the evaporation gas are higher, the high-temperature gas directly enters the motor, the heat dissipation effect of the motor is extremely limited, and the temperature of a stator winding 6 and a rotor is locally overhigh, the invention arranges air port shells 17 at two outer sides of a motor shell 2 and is communicated with an air duct inlet 15 and an air duct outlet 13 on the shell 2, the high-temperature media of the steam turbine power generation system, the waste heat power generation system and the air compression system enter the motor through the shell air duct inlet 15, a plurality of high-pressure liquid spraying ports 1 are arranged on the shell, spraying low boiling point Freon, R245 and other media, the boiling point of the above media is generally lower than 30 ℃ under high pressure, and the liquid is phase-changed by contacting with high-temperature gas, thereby greatly reducing and more uniform the gas temperature at the air duct inlet 15, greatly reducing the temperature of the motor cooling media, greatly improving the cooling effect of the motor and reducing the temperature of the motor. Meanwhile, an outer cooling air duct 3 and an additional copper plate 4 are arranged outside a motor stator core 5, the outer cooling air duct 3 is composed of the copper plate and a shell, the heat conduction characteristic of copper is very high, the heat of the stator core 4 and the stator winding 5 can be effectively transmitted into the outer cooling air duct 3 through the copper plate 4, and therefore the heat is taken away, the stator core 4 achieves a good heat dissipation effect, an inner cooling air duct 7 is arranged in a stator slot, the heat of the stator winding 6 can be further dissipated, the heat of a rotor can be dissipated, and the stator and the rotor of the motor can achieve a good heat dissipation effect. High-temperature gas enters the motor through the motor air duct inlet 15, the gas temperature is greatly reduced through the liquid spraying port 1, low-temperature mixed gas flows through the outer cooling air duct 3 and the inner cooling air duct 7, takes away heat of the motor stator and the motor rotor, flows to the other end of the motor, flows into the outer pipeline of the system through the air duct outlet 13 at the other end of the motor and the pipeline air outlet 19, and is recycled through condensation, evaporation and recovery devices. By adopting the cooling scheme of combining the high-pressure liquid spraying port 1 of the motor air inlet, the stator copper external cooling air duct 3 and the stator in-slot cooling air duct 7, the invention can effectively solve the problems that the high-speed permanent magnet motor for the totally-enclosed systems such as a turbo generator, a waste heat generator, an air compressor and the like has small volume, difficult heat dissipation and high gas temperature which can reach more than 70 ℃, brings great difficulty to the heat dissipation of the motor, can effectively reduce the temperature of a permanent magnet and a winding, and effectively improves the reliability and the service life of the motor.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A spray cooled totally-enclosed high-speed permanent magnet motor comprises a motor casing (2), a stator and a rotor which are arranged in the casing (2), and end covers (12) which are arranged at the front end and the rear end of the casing (2), and is characterized in that the end covers at the front end and the rear end are both provided with a tuyere shell (17) and the high-speed permanent magnet motor is enclosed in the tuyere shell, so as to form a totally-enclosed high-speed permanent magnet motor, the tuyere shells at the front end and the rear end of the totally-enclosed high-speed permanent magnet motor are respectively provided with a pipeline air inlet (18) and a pipeline air outlet (19), meanwhile, the end covers at the front end and the rear end are correspondingly provided with an air duct inlet (15) and an air duct outlet (13), the pipeline air outlet is communicated with the pipeline air inlet to form the circular flow of gas in the motor, in addition, the side surface at the front end, this hydrojet mouth is used for cooling the high-temperature gas that gets into from the wind channel entry, spun cooling liquid is freon, R245 or R141 in the hydrojet mouth, wherein, the gas that air intake (18) got into is turbo power generation system, preheats the high-temperature gas that power generation system or air compression system self produced, and this high-temperature gas gets into wind channel entry (15) and takes place the phase transition with spun cooling liquid contact in hydrojet mouth (1) of this wind channel mouth (15) department, thereby makes the gas temperature greatly reduced of wind channel entry (15), realizes the cooling to the high-temperature gas that the wind channel entry got into.
2. The liquid-jet-cooled totally-enclosed high-speed permanent magnet motor according to claim 1, wherein the rotor comprises a rotor core (10), a permanent magnet (9) and a protective sleeve (8), the permanent magnet (9) is attached to the rotor core (10), the protective sleeve (8) is sleeved on the periphery of the permanent magnet, and the rotor core (10) is a rotating shaft.
3. The spray-cooled totally-enclosed high-speed permanent magnet motor according to claim 2, wherein an impeller (16) is arranged on a rotor core of the rotor in the tuyere housing (17) at the front end, and the gas flows into the motor after passing through the impeller (16) to form a totally-enclosed structure.
4. The liquid-jet-cooled totally-enclosed high-speed permanent magnet motor according to claim 1, wherein the stator comprises a stator core (5) and a stator winding (6), the stator winding is arranged on the stator core, and an internal cooling air duct (7) is arranged between the stator winding (5) and the periphery of the rotor.
5. The spray-cooled totally-enclosed high-speed permanent magnet motor according to claim 1, wherein the stator core is provided with copper plates (4) at its periphery to form an external cooling air duct (3) with the casing, and the external cooling air duct is a spiral or axial air duct.
6. A spray cooled, totally enclosed high speed permanent magnet machine according to claim 1, wherein the end cap of the front end is also provided with spray ports (1) for further cooling.
7. The spray-cooled fully-enclosed high-speed permanent magnet machine according to claim 2, wherein the casing is made of carbon steel and the protective jacket is made of carbon fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810098430.XA CN108258849B (en) | 2018-01-31 | 2018-01-31 | Liquid-spraying-cooled totally-enclosed high-speed permanent magnet motor |
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| CN201810098430.XA CN108258849B (en) | 2018-01-31 | 2018-01-31 | Liquid-spraying-cooled totally-enclosed high-speed permanent magnet motor |
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| CN108258849B true CN108258849B (en) | 2020-07-10 |
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| CN109120104B (en) * | 2018-09-28 | 2020-05-08 | 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 |
| CN109831054B (en) * | 2019-03-15 | 2024-03-12 | 广东索特能源科技有限公司 | Motor with cooling system |
| 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 |
| GB2594920A (en) * | 2020-04-09 | 2021-11-17 | Hamilton Sundstrand Corp | Cooling system for electric machines |
| 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 |
| CN113708550B (en) * | 2021-09-14 | 2022-11-15 | 威海西立电子有限公司 | Electric machine |
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