CN101814797A - Cooling system of high speed permanent magnet motor stator - Google Patents
Cooling system of high speed permanent magnet motor stator Download PDFInfo
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- CN101814797A CN101814797A CN 201010180827 CN201010180827A CN101814797A CN 101814797 A CN101814797 A CN 101814797A CN 201010180827 CN201010180827 CN 201010180827 CN 201010180827 A CN201010180827 A CN 201010180827A CN 101814797 A CN101814797 A CN 101814797A
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Abstract
The invention relates to a cooling system of a high speed permanent magnet motor stator, which belongs to the technical field of motors and solves the problem of reducing working stabilities of a permanent magnet in the motor and the whole motor due to the over-high temperature of a rotor of a traditional high speed permanent magnet motor. The cooling system comprises a machine shell and a stator core, wherein the stator core is covered in the machine shell, a plurality of stator slots are uniformly and radially distributed on the inner circumference of the core of each stator slot along the circumferential direction, a winding is wound in the stator slot of the stator core, a stator slot wedge is arranged at the opening of each stator slot, the stator slot wedge and an inner wall of the opening of the stator slot are tightly matched, inner cooling pipelines are arranged in an axial channel formed by each stator slot wedge, two side walls of the stator slot of the stator slot wedge and the inner surface and the outer surface of the slot of the winding and two end parts of the plurality of inner cooling pipelines respectively converge together to form an inlet and an outlet. The invention is used for cooling the high speed permanent magnet motor.
Description
Technical field
The present invention relates to a kind of cooling system of high speed permanent magnet motor stator, belong to technical field of motors.
Background technology
High-speed permanent magnet motor is big in rotating speed height, power density with common high-speed electric expreess locomotive, stock utilization is high, dynamic response is very fast and characteristics such as transmission system efficiency height in, also have efficient height, advantage that power factor is high, therefore have a good application prospect in fields such as the centrifugal compressor of air-conditioning or refrigerator, accumulated energy flywheel, weaving, high speed grinding machine, hybrid vehicle, aviation, boats and ships.Particularly in distributed generation system, because gas turbine powered high-speed permanent magnet motor volume is little, has higher mobility, make it can be used as the stand-by power supply of hospital, hotel and other critical facility, also can be used as independent current source or small hydropower station, to remedy the deficiency of concentration supply power, has important practical value.
High-speed permanent magnet motor is when operation, and the power frequency of its stator winding is up to more than the 1000Hz, and the rotary speed of rotor is changeed up to per minute several ten thousand, and its electric machine iron core has very high power density, and iron loss and armature winding copper loss in the unit volume are all very big.In the type motor, generally adopt the mode of in the closed chamber of stator side, leading to coolant or open domain ventilation to dispel the heat, consider the structure and the safety problem of cooling system, the general insulation cooling medium heat conduction poor-performing that adopts, cooling effect is not strong, especially less to the thermolysis of rotor generation, make the motor internal rotor still can produce higher temperature rise, and the temperature of rotor is too high, will influence the job stability of interior permanent magnet of motor and whole motor, shorten its useful life simultaneously.
Summary of the invention
The present invention is too high for the temperature of rotor that solves existing high-speed permanent magnet motor, makes the problem of the job stability reduction of interior permanent magnet of motor and whole motor, and a kind of cooling system of high speed permanent magnet motor stator is provided.
The present invention includes casing and stator core, stator core covers in the casing, along the circumferential direction be a plurality of stator slots of radial even distribution on the inner periphery of described stator core, winding is wrapped in the stator slot of stator core, the notch place of each stator slot is provided with a stator slot wedge, the notch place inwall of described stator slot wedge and stator slot closely cooperates, in two sidewalls of each stator slot wedge and its place stator slot and the formed axial passage of groove surfaces externally and internally of winding interior cooling pipe is set, described a plurality of in two ends of cooling pipes pool together the formation entrance and exit respectively.
Advantage of the present invention is: the present invention is applied on the high-speed electric expreess locomotive, when machine operation, inwardly feeds coolant in the cooling pipe, along with coolant flowing vertically, can in time take away heat and then cooling stator core in the stator core.It has cancelled the coffer in the existing motor, makes gas length increase in the motor, and the space of air flows increases, and then conductive force strengthens.The present invention can make the gas length of existing motor increase to 3mm by 1mm, when motor speed is 60,000 commentaries on classics per minutes, the effective thermal conductivity that can make air by in the existing motor 0.28W/(m* ℃) increase to 0.39W/(m* ℃), improved the capacity of heat transmission of motion air so greatly, made the rotor-side heat be delivered to stator side more.
The interior cooling pipe that adds among the present invention can avoid coolant to contact with the direct of motor component such as stator winding iron cores, can adopt the good media of cooling performance such as water that motor is cooled off thus.Computational analysis shows that under the same fluid flow velocity, when adopting oil cooling, technical solution of the present invention can make the motor maximum temperaturerise reduce by 10 ℃; When adopting water-cooled, motor temperature changes more remarkable, when flow velocity is 1m/s, with the coefficient of heat transfer of motor contact-making surface up to 953W/ (m* ℃), can make the rotor-side temperature reduce about 40 ℃, effectively avoided the demagnetization of the too high motor internal permanent magnet that causes of rotor temperature rise, the integral working stability of motor is improved greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention, and arrow is represented the flow direction of coolant in the cooling duct among the figure; Fig. 2 is the A-A cutaway view of Fig. 1; Fig. 3 is the structural representation of embodiment of the present invention three, and arrow is represented the flow direction of coolant in the cooling duct among the figure; Fig. 4 is the B-B cutaway view of Fig. 3; Fig. 5 is the pipe interior diameter schematic diagram of cooling pipe described in execution mode one, two, three or four; Fig. 6 is that the pipe interior diameter of cooling pipe described in the execution mode five changes schematic diagram; Fig. 7 is that the pipe interior diameter of cooling pipe described in the execution mode six changes schematic diagram; Fig. 8 is that the pipe interior diameter of cooling pipe described in the execution mode eight changes schematic diagram, among Fig. 5 to Fig. 8
hRepresent the pipe interior diameter of cooling pipe,
LRepresent the length of cooling pipe; Fig. 9 is the curve chart that the coolant coefficient of heat transfer changes in the execution mode one; Figure 10 is the curve chart that the coolant coefficient of heat transfer changes in the execution mode five; Figure 11 is the curve chart that the coolant coefficient of heat transfer changes in the execution mode six; Figure 12 is the curve chart that the coolant coefficient of heat transfer changes in the execution mode eight; Figure 13 be the pipe interior diameter of cooling pipe motor shaft is to the stator winding temperature change curve when adopting the different technologies scheme, curve A is that stator winding temperature change curve in the execution mode one, curve B are that stator winding temperature change curve in the execution mode five, curve C are that stator winding temperature change curve in the execution mode six, curve D are stator winding temperature change curve in the execution mode eight among the figure; Figure 14 be the pipe interior diameter of cooling pipe motor shaft is to the temperature of rotor change curve when adopting the different technologies scheme, curve E is that execution mode one rotor temperature variation curve, F are that execution mode eight rotor temperature variation curves, G are that execution mode six rotor temperature variation curves, H are execution mode five rotor temperature variation curves among the figure.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 5, present embodiment comprises casing 1 and stator core 2, stator core 2 covers in the casing 1, along the circumferential direction be a plurality of stator slot 2-1 of radial even distribution on the inner periphery of described stator core 2, winding 2-2 is wrapped in the stator slot 2-1 of stator core 2, the notch place of each stator slot 2-1 is provided with a stator slot wedge 2-3, the notch place inwall of described stator slot wedge 2-3 and stator slot 2-1 closely cooperates, cooling pipe 2-4 in being provided with in two sidewalls of each stator slot wedge 2-3 and its place stator slot 2-1 and the formed axial passage of groove surfaces externally and internally of winding 2-2, described a plurality of in two ends of cooling pipe 2-4 pool together respectively and form inlet 2-5 and outlet 2-6.
Winding 2-2 is wrapped in the stator slot 2-1 of stator core 2 in the present embodiment, and for logical coolant, winding 2-2 only accounts for a part of space of place stator slot 2-1, cooling pipe 2-4 in remaining part is used for placing.Interior cooling pipe 2-4 adopts material non-conductive, high heat conduction to make.
In the stator cooling system of existing motor, design oil flinger ring usually and isolate coolant and stator and rotor, motor components such as coolant and stator winding iron core directly contact, and the coolant that so just need employing insulate is as the transformer wet goods.Polyimide film, its conductive coefficient＜1W/(m* ℃ are adopted in the making of oil flinger ring), be generally 0.3W/(m* ℃).Consider the air high speed rotating, fluid is high turbulent condition in the air gap, and the air conductive coefficient also only reaches 0.28W/(m* ℃ by analysis) (0.02W/(m* ℃ of general still air conductive coefficient)).Oil flinger ring also causes the gas length of motor too small, is unfavorable for utilizing the capacity of heat transmission of air to transmit the heat of rotor-side.Added interior cooling pipe 2-4 behind the present embodiment cancellation oil flinger ring, it has increased the seal of coolant at motor internal, medium does not contact with winding etc., therefore can adopt the good coolants of cooling performance such as water, freon, the cooling effect of water and freon etc. is far above transformer oil, and its high thermal conductivity can more effective cooling motor.With the water flowing is example, because conductive coefficient height, the kinematic viscosity of water are little, when its flow velocity is 1m/s, reach 953W/ (m* ℃) with the stator contact-making surface coefficient of heat transfer of motor, and during logical in the prior art oil cooling, coefficient of heat transfer only be 230W/ (m* a ℃), so the employing technical solution of the present invention can make the cooling effect of motor improve greatly, the rotor-side temperature rise reduces about 40 ℃, and the stator armature winding temperature rise reduces about 30 ℃.
Embodiment two: present embodiment is described below in conjunction with Fig. 3 and Fig. 4, the difference of present embodiment and execution mode one is that it also comprises outer cooling row of conduits 3, and described outer cooling row of conduits 3 is arranged between the outer round surface of casing 1 and stator core 2.Other composition and annexation are identical with execution mode one.
Outer cooling row of conduits 3 can directly be cooled off motor yoke, and the temperature of motor is further reduced.
Embodiment three: present embodiment is that with the difference of execution mode two described cooling pipe row's 3 input port is connected with the inlet 2-5 of interior cooling pipe 2-4, and described cooling pipe row's 3 delivery outlet is connected with the outlet 2-6 of interior cooling pipe 2-4.Other composition and annexation are identical with execution mode two.
Pool together with bus-bar cooling off the end of row of conduits 3 outward with interior cooling pipe 2-4, form the cooling system of an integral body circulation, reduced on the one hand the Auxiliary Power Unit of cooling system and cooling pipe connection device, improved the airtight reliability of cooling system at motor internal; On the other hand, part has increased outer cooling row of conduits 3 and the length of interior cooling pipe 2-4 at motor internal, can more effectively bring into play cooling effect, and particularly for stator winding end, cooling effect is more remarkable.
Embodiment four: below in conjunction with Fig. 3 and Fig. 4 present embodiment is described, present embodiment and execution mode two or threes' difference is each pipeline in axial direction adjacent arrangement between the outer round surface of casing 1 and stator core 2 in the described outer cooling row of conduits 3.Other composition and annexation are identical with execution mode two or three.
Under the acting in conjunction of cooling pipe row 3 of present embodiment China and foreign countries and interior cooling pipe 2-4, can make the temperature of electric machine stator iron 2 reduce by 30 ℃.Simultaneously, because the reduction of stator temperature, the rotor heat can more transmit to stator, the analysis showed that, compares with the technical scheme of execution mode one, and present embodiment can make the rotor-side temperature reduce by 10 ℃ again.The reduction of rotor-side working temperature can make the permanent magnet service behaviour more stable, and prolongs electrical machinery life.
Embodiment five: the difference of present embodiment and execution mode four is that each pipeline in described interior cooling pipe 2-4 and the outer cooling row of conduits 3 in axial direction is divided into two sections, be entrance and outlet section, outlet section pipe interior diameter is 1/2nd of an entrance pipe interior diameter.Other composition and annexation are identical with execution mode four.
Embodiment six: the difference of present embodiment and execution mode four is that each pipeline in described interior cooling pipe 2-4 and the outer cooling row of conduits 3 in axial direction is divided into three sections, be entrance, interlude and outlet section, interlude pipe interior diameter is 3/4ths of an entrance pipe interior diameter, and outlet section pipe interior diameter is 1/2nd of an entrance pipe interior diameter.Other composition and annexation are identical with execution mode four.
Embodiment seven: the difference of present embodiment and execution mode four is that described interior cooling pipe 2-4 dwindles with each pipeline pipe interior diameter linearity in axial direction of cooling off in the row of conduits 3 outward.Other composition and annexation are identical with execution mode four.
Embodiment eight: the difference of present embodiment and execution mode seven be described in the exit pipe interior diameter of cooling pipe 2-4 and outer cooling row of conduits 3 be 1/2nd of porch pipe interior diameter.Other composition and annexation are identical with execution mode seven.
The respective embodiments described above are combined as can be seen with Fig. 5 to Figure 14, and in the cross-sectional area of the cooling pipe position that changes, the fluid coefficient of heat transfer is undergone mutation, and flex point appears in the coefficient of heat transfer distribution curve.Keeping under the constant situation of cooling medium consumption, along with fluid by locating reducing of cross-sectional area, the corresponding increase of the coefficient of heat transfer of coolant.
When adopting the cooling pipe that becomes diameter, the temperature at diverse location place all reduces in various degree in the motor, and as shown in table 1, wherein the average range of decrease of stator core and rotor block temperature reaches 15 ℃ and 12 ℃ respectively.Simultaneously, motor diverse location temperature amplitude of variation vertically reduces, and the stator winding axial temperature difference reduces by 43%, and the rotor axial temperature difference reduces by 44%, and stator core position axial temperature difference reduces by 29%, and Temperature Distribution is tending towards even in the motor.
Find out thus,, reduce the diameter of cooling pipe at the axial diverse location place of cooling pipe, under the constant situation of cooling medium consumption, can effectively increase the heat-sinking capability of coolant, and make that Temperature Distribution is tending towards even in the motor by appropriate design.
Embodiment nine: present embodiment and execution mode two or threes' difference is that described outer cooling row of conduits 3 is an annular, cools off each pipeline along the circumferential direction adjacent arrangement between the outer round surface of casing 1 and stator core 2 in the row of conduits 3 outward.Other composition and annexation are identical with execution mode two or three.
Present embodiment can effectively increase the length of outer cooling row of conduits 3 at motor internal, thereby strengthens the thermolysis of coolant; Simultaneously, the outer cooling row of conduits 3 that is circumferential distribution forms Box junction cooling layout with interior cooling pipe 2-4, can make the motor stator Temperature Distribution more become even.
Claims (9)
1. cooling system of high speed permanent magnet motor stator, it comprises casing (1) and stator core (2), stator core (2) covers in the casing (1), along the circumferential direction be a plurality of stator slots of radial even distribution (2-1) on the inner periphery of described stator core (2), winding (2-2) is wrapped in the stator slot (2-1) of stator core (2), it is characterized in that: the notch place of each stator slot (2-1) is provided with a stator slot wedge (2-3), described stator slot wedge (2-3) closely cooperates with the notch place inwall of stator slot (2-1), in two sidewalls of each stator slot wedge (2-3) and its place stator slot (2-1) and the formed axial passage of groove surfaces externally and internally of winding (2-2) interior cooling pipe (2-4) is set, described a plurality of in two ends of cooling pipes (2-4) pool together respectively and form inlet (2-5) and export (2-6).
2. cooling system of high speed permanent magnet motor stator according to claim 1 is characterized in that: it also comprises outer cooling row of conduits (3), and described outer cooling row of conduits (3) is arranged between the outer round surface of casing (1) and stator core (2).
3. cooling system of high speed permanent magnet motor stator according to claim 2, it is characterized in that: described cooling pipe row's (3) input port is connected with the inlet (2-5) of interior cooling pipe (2-4), and described cooling pipe row's (3) delivery outlet is connected with the outlet (2-6) of interior cooling pipe (2-4).
4. according to claim 2 or 3 described cooling system of high speed permanent magnet motor stator, it is characterized in that: each pipeline in axial direction adjacent arrangement between the outer round surface of casing (1) and stator core (2) in the described outer cooling row of conduits (3).
5. cooling system of high speed permanent magnet motor stator according to claim 4, it is characterized in that: each pipeline in described in cooling pipe (2-4) and the outer cooling row of conduits (3) in axial direction is divided into two sections, be entrance and outlet section, outlet section pipe interior diameter is 1/2nd of an entrance pipe interior diameter.
6. cooling system of high speed permanent magnet motor stator according to claim 4, it is characterized in that: each pipeline in described in cooling pipe (2-4) and the outer cooling row of conduits (3) in axial direction is divided into three sections, be entrance, interlude and outlet section, interlude pipe interior diameter is 3/4ths of an entrance pipe interior diameter, and outlet section pipe interior diameter is 1/2nd of an entrance pipe interior diameter.
7. cooling system of high speed permanent magnet motor stator according to claim 4 is characterized in that: each pipeline pipe interior diameter linearity in axial direction in described in cooling pipe (2-4) and the outer cooling row of conduits (3) is dwindled.
8. cooling system of high speed permanent magnet motor stator according to claim 7 is characterized in that: the exit pipe interior diameter of cooling pipe (2-4) and outer cooling row of conduits (3) is 1/2nd of a porch pipe interior diameter in described.
9. according to claim 2 or 3 described cooling system of high speed permanent magnet motor stator, it is characterized in that: described outer cooling row of conduits (3) is cooled off each pipeline along the circumferential direction adjacent arrangement between the outer round surface of casing (1) and stator core (2) in the row of conduits (3) outward for annular.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010180827 CN101814797A (en) | 2010-05-24 | 2010-05-24 | Cooling system of high speed permanent magnet motor stator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010180827 CN101814797A (en) | 2010-05-24 | 2010-05-24 | Cooling system of high speed permanent magnet motor stator |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593975A (en) * | 2012-03-23 | 2012-07-18 | 张承宁 | Cooling structure of motor stator and manufacture method thereof |
| CN102801238A (en) * | 2012-08-15 | 2012-11-28 | 北京交通大学 | Permanent magnet motor rotor beneficial for radiating |
| CN103199652A (en) * | 2013-03-13 | 2013-07-10 | 北京交通大学 | Gas-liquid interlaced cooling high power density motor |
| CN103683674A (en) * | 2012-09-26 | 2014-03-26 | 大银微系统股份有限公司 | Water cooling mechanism of rod-shaped motor |
| CN105262281A (en) * | 2015-11-05 | 2016-01-20 | 中国船舶重工集团公司第七0四研究所 | Motor cooling system |
| CN108092426A (en) * | 2018-01-25 | 2018-05-29 | 博远机电（嘉兴）有限公司 | stator punching and stator core |
| CN108370194A (en) * | 2015-12-14 | 2018-08-03 | 通用电器技术有限公司 | Slip ring for motor is arranged |
| CN109474225A (en) * | 2018-12-14 | 2019-03-15 | 潍柴动力股份有限公司 | A kind of control method and device of electromotor cooling system coolant liquid |
| CN109936227A (en) * | 2019-04-11 | 2019-06-25 | 浙江大学 | Wind-driven generator |
| JP2020526167A (en) * | 2017-06-27 | 2020-08-27 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Electric machine |
| CN111654163A (en) * | 2020-05-11 | 2020-09-11 | 浙江富春江水电设备有限公司 | Efficient heat dissipation system for pole coil of hydraulic generator |
| CN112564338A (en) * | 2019-09-26 | 2021-03-26 | 广州汽车集团股份有限公司 | Driving motor cooling structure, driving motor and car |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593975A (en) * | 2012-03-23 | 2012-07-18 | 张承宁 | Cooling structure of motor stator and manufacture method thereof |
| CN102801238A (en) * | 2012-08-15 | 2012-11-28 | 北京交通大学 | Permanent magnet motor rotor beneficial for radiating |
| CN103683674A (en) * | 2012-09-26 | 2014-03-26 | 大银微系统股份有限公司 | Water cooling mechanism of rod-shaped motor |
| CN103683674B (en) * | 2012-09-26 | 2017-06-09 | 大银微系统股份有限公司 | The magnetism servo-electric motor water-cooling of bar-shaped motor |
| CN103199652A (en) * | 2013-03-13 | 2013-07-10 | 北京交通大学 | Gas-liquid interlaced cooling high power density motor |
| CN103199652B (en) * | 2013-03-13 | 2014-12-31 | 北京交通大学 | Gas-liquid interlaced cooling high power density motor |
| CN105262281A (en) * | 2015-11-05 | 2016-01-20 | 中国船舶重工集团公司第七0四研究所 | Motor cooling system |
| CN108370194A (en) * | 2015-12-14 | 2018-08-03 | 通用电器技术有限公司 | Slip ring for motor is arranged |
| CN108370194B (en) * | 2015-12-14 | 2020-09-11 | 通用电器技术有限公司 | Slip ring arrangement for an electric machine |
| JP2020526167A (en) * | 2017-06-27 | 2020-08-27 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Electric machine |
| US11190064B2 (en) | 2017-06-27 | 2021-11-30 | Mahle International Gmbh | Electrical machine, in particular for a vehicle |
| CN108092426A (en) * | 2018-01-25 | 2018-05-29 | 博远机电（嘉兴）有限公司 | stator punching and stator core |
| CN109474225A (en) * | 2018-12-14 | 2019-03-15 | 潍柴动力股份有限公司 | A kind of control method and device of electromotor cooling system coolant liquid |
| CN109936227A (en) * | 2019-04-11 | 2019-06-25 | 浙江大学 | Wind-driven generator |
| CN112564338A (en) * | 2019-09-26 | 2021-03-26 | 广州汽车集团股份有限公司 | Driving motor cooling structure, driving motor and car |
| CN111654163A (en) * | 2020-05-11 | 2020-09-11 | 浙江富春江水电设备有限公司 | Efficient heat dissipation system for pole coil of hydraulic generator |
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Open date: 20100825 |