CN111181300A - Oil cooling structure of permanent magnet synchronous motor - Google Patents
Oil cooling structure of permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN111181300A CN111181300A CN201811336780.1A CN201811336780A CN111181300A CN 111181300 A CN111181300 A CN 111181300A CN 201811336780 A CN201811336780 A CN 201811336780A CN 111181300 A CN111181300 A CN 111181300A
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- Prior art keywords
- oil
- motor
- shell
- rotating shaft
- rotor
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- 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
Abstract
The invention discloses an oil cooling structure of a permanent magnet synchronous motor, wherein a rotating shaft provided with a motor rotor is matched in a motor shell through a motor bearing, and a motor end cover is arranged at the end part of the motor shell; the motor shell is provided with a shell oil duct; the motor end cover is provided with an end cover oil duct; the rotating shaft is provided with a rotating shaft oil duct; the motor rotor is provided with a rotor oil guide channel; a shell oil duct with an oil inlet function is arranged in the upper shell; a shell oil duct with an oil outlet function is arranged in the lower shell; a shell oil inlet of a shell oil duct with an oil inlet function is arranged on the end surface of the upper shell; the lower shell is provided with a motor oil outlet of a shell oil duct with an oil outlet function; a cooling oil recovery port communicated with the shell oil duct with the oil outlet function is arranged on the inner wall of the lower shell; the end cover oil duct is respectively communicated with the shell oil inlet and the rotating shaft oil duct; the rotating shaft is provided with a rotor oil inlet hole for communicating the rotating shaft oil duct with the rotor oil guide channel; the rotating shaft oil passage is communicated to an end part outlet of the motor rotor; and a bearing oil spray hole which is communicated with the rotating shaft oil duct and faces the motor bearing is also arranged on the motor rotor.
Description
Technical Field
The invention relates to a motor oil cooling scheme, in particular to a permanent magnet synchronous motor oil cooling structure.
Background
At present, a driving motor of a new energy automobile gradually tends to high power density and high speed, the problem of motor cooling is increasingly remarkable, a cooling scheme adopted by a traditional driving motor is water cooling or air cooling, the heat of the motor is transferred to a motor shell through a stator iron core, and finally the heat is taken away by a cooling medium inside or on the surface of the shell.
The existing water-cooling or air-cooling motor can still meet the heat dissipation requirement of normal work of the motor for the motor with smaller power density, but when the power density of the motor is very high and the rotating speed is higher, the cooling capacity of the traditional heat dissipation mode is limited, the motor rotor can not be effectively cooled, and the power loss of the motor is more serious when the motor runs at high speed for a long time.
For example, chinese utility model patent "cooling structure of oil-cooled motor", application number 2017208136070, it discloses an oil circuit structure that sets up in the motor end cover, and leads to bearing fit clearance department. Although it can provide a certain cooling effect, it is found from the actual test results that the cooling structure is not ideal.
For another example, chinese utility model patent "oil-cooled motor and vehicle", application number 201621083992X, it discloses an oil circuit of setting in the motor housing, reaches the cooling effect through spraying the coolant oil to motor stator and rotor, though its cooling effect is more ideal, but the drawback of structure is, the backward flow of coolant oil and reposition of redundant personnel effect are not ideal, and the cooperation setting of oil circuit also can't satisfy the operating standard of motor.
Disclosure of Invention
The invention aims to: the oil cooling structure of the permanent magnet synchronous motor solves the problem that the cooling efficiency of the oil cooling structure is low due to poor matching relation of oil ducts.
The technical scheme of the invention is as follows: a permanent magnet synchronous motor oil cooling structure comprises a motor shell, a motor end cover, a rotating shaft, a motor rotor and a motor stator. The rotating shaft provided with the motor rotor is matched in the motor shell through a motor bearing, a motor winding is embedded and wound on the motor rotor, and a motor stator is arranged in the motor shell. The motor end cover is hermetically arranged at the end part of the motor shell, and a shell oil duct is arranged in the inner wall of the motor shell; an end cover oil duct is arranged in the inner wall of the motor end cover; a rotating shaft oil passage is arranged on the axis of the rotating shaft; the motor rotor is provided with a rotor oil guide channel parallel to the axis.
The motor housing may be divided into an upper housing, i.e., a motor housing on an upper side, and a lower housing, i.e., a motor housing on a lower side. A shell oil duct with an oil inlet function is arranged in the upper shell; a shell oil duct with an oil outlet function is arranged in the lower shell; a shell oil inlet of a shell oil duct with an oil inlet function is arranged on the end surface of the upper shell; a shell oil spray hole communicated with a shell oil duct with an oil outlet function is formed in the inner wall of the upper shell; the lower shell is provided with a motor oil outlet of a shell oil duct with an oil outlet function; and a cooling oil recovery port communicated with the shell oil duct with the oil outlet function is arranged on the inner wall of the lower shell.
The end cover oil passage is respectively communicated with the shell oil inlet and the rotating shaft oil passage; the rotating shaft is provided with a rotor oil inlet hole which is communicated with the rotating shaft oil duct and the rotor oil guide channel; the rotating shaft oil passage is communicated to an end part outlet of the motor rotor; and the motor rotor is also provided with a bearing oil spray hole which is communicated with the rotating shaft oil duct and faces the motor bearing.
Preferably, an oil channel baffle plate for shunting the cooling oil branch line is further arranged in the shell oil channel of the motor shell on the upper side; the oil duct baffles are symmetrically distributed by taking the axial plane where the motor oil inlet is located as a symmetric central plane.
Preferably, a branch oil passage baffle for branching a cooling oil main line is further arranged in the housing oil passage of the upper motor housing; the sub-runner baffle is over against the oil inlet of the motor.
Preferably, the motor end cover is provided with a motor oil inlet which leads to the end cover oil passage.
Preferably, the height of the motor oil outlet does not exceed the height of the cooling oil recovery port.
The invention has the advantages that:
1. the motor shell is composed of an oil inlet upper shell and an oil outlet lower shell, and oil inlet and oil outlet parts are not arranged independently, so that the space is effectively saved.
2. The oil duct in the shell has a certain cooling effect on the motor stator, and the phenomenon that the temperature of the stator and the winding in the slot is higher due to the fact that the oil-cooled motor only cools the end of the winding is avoided.
3. Carry out rotor oil feed and bearing oil spout design through motor shaft, improve obviously to the inside magnet steel cooling of rotor, play the lubricated effect of cooling down to the bearing simultaneously, the rotational speed is higher, and cooling flow is big more, and the cooling effect is better.
4. The oil outlet structure design of the lower shell of the motor ensures that the oil outlet of the motor shell is smooth, the liquid level of the cooling oil does not reach an air gap to influence the efficiency of the motor, the high cooling oil at a certain liquid level is always arranged at the bottom of the motor, and the cooling effect is enhanced.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is an axial middle section view of a permanent magnet synchronous motor oil cooling structure
FIG. 2 is a schematic view of an end face of a motor housing of an oil cooling structure of a permanent magnet synchronous motor
FIG. 3 is an expanded view of the internal structure of the upper shell;
wherein: 1. a motor housing; 11. a housing oil passage; 12. a housing oil spray hole; 13. a shell oil inlet; 14. a cooling oil recovery port; 15. an oil outlet of the motor; 16. an oil duct baffle; 17. an upper shell 18, a lower shell; 2. a motor end cover; 21. an end cover oil passage; 3. a rotating shaft; 31. a rotating shaft oil passage; 32. a bearing oil spray hole; 33. a rotor oil inlet hole; 41. a motor bearing A; 42. a motor bearing B; 5. an oil inlet of the motor; 6. a motor stator; 7. a motor rotor; 71. a rotor oil guide channel; 8. and (4) motor windings.
Detailed Description
The preferred embodiment of the present invention:
the utility model provides a permanent magnet synchronous motor oil cooling structure, has included motor casing 1, motor end cover 2, pivot 3, electric motor rotor 7, motor stator 6. The motor rotor 7 is sleeved on the rotating shaft 3, the motor winding 8 is embedded on the motor rotor, the corresponding motor stator 6 is arranged in the motor shell 1, the rotating shaft 3 is matched with the motor shell 1 in a coaxial position relation, the motor end covers 2 are respectively arranged at the two ends of the motor shell 1 in a sealing mode, and the motor rotating shaft 3 is matched with the shaft holes in the motor end covers 2 on the two sides through the motor bearings.
An end cover oil channel 21 is arranged in the inner wall of one of the motor end covers 2, a shell oil channel 11 is arranged in the inner wall of the motor shell 1, a rotating shaft 3 oil channel is arranged on the axis of the rotating shaft 3, and a rotor oil guide channel 71 parallel to the axis is arranged on the motor rotor 7. The serial oil passages can realize the circulating flow of cooling oil through butt joint, thereby achieving the best cooling effect.
The motor housing 1 may be divided into an upper housing 17 and a lower housing 18, where the upper housing 17 is the upper side of the motor housing 1, and the lower housing 18 is the lower side of the motor housing 1. The upper shell 17 is used for discharging cooling oil, so that a shell oil duct 11 with an oil inlet function is arranged in the upper shell 17; the lower casing 18 is a casing oil passage 11 that realizes the cooling oil removal, and therefore, an oil discharge function is provided in the lower casing 18.
The motor end cover 2 is provided with a motor oil inlet 5, cooling oil enters the end cover oil duct 21 from the motor oil inlet 5, and the end cover oil duct 21 is respectively communicated with the shell oil inlet 13 and the rotating shaft oil duct 31. The end cover oil path in the motor end cover 2 is divided into two paths, one path enters the shell oil path 11, and the other path enters the rotating shaft 3 through the end cover oil path 21.
A shell oil inlet 13 is formed in the end face of the upper shell 17, and the shell oil inlet 13 is communicated with the motor oil inlet 5 and the shell oil duct 11 with an oil inlet function. And a shell oil spray hole 12 communicated with a shell oil duct 11 with an oil outlet function is formed in the inner wall of the upper shell 17, and cooling oil can directly reach the interior of the motor from the shell oil spray hole 12.
The rotating shaft 3 is provided with a rotor oil inlet 33 for communicating the rotating shaft oil passage 31 with the rotor oil guide channel 71, the rotating shaft oil passage 31 leads to an end outlet of the motor rotor 7, and the cooling oil cools the radial oil of the motor rotor 7. Still be equipped with intercommunication pivot oil duct 31 and towards the bearing nozzle opening 32 of motor bearing on electric motor rotor 7, in this embodiment, because pivot 3 is clearance fit with motor end cover 2, the cooling oil has partial cooling oil to flow into motor bearing A41 along the analysis by the in-process that motor end cover 2 got into pivot 3, cools off and lubricates motor bearing A. The cooling oil entering the inside of the rotating shaft 3 enters the rotor oil inlet hole 33 and the bearing oil injection hole 32 under the action of centrifugal force, the cooling oil in the rotor oil inlet hole 33 enters the oil guide groove on the rotor, flows through the inside of the motor rotor 7 along the axial direction of the motor rotor 7 and finally flows out, and the purpose of cooling the inside of the rotor is achieved. Meanwhile, the cooling oil sprayed from the bearing oil spray hole 32 cools and lubricates the motor bearing B42.
In order to ensure the flow uniformity of the cooling oil, an oil passage baffle 16 for branching the cooling oil branch lines is further arranged in the housing oil passage 11 of the upper motor housing 1, and the oil passage baffle 16 is symmetrically distributed by taking the axial plane of the motor oil inlet 5 as a symmetric central plane. The cooling oil can be guaranteed to uniformly reach the positions of all oil injection holes in the shell and be injected to the end part of the winding, and meanwhile, the oil duct in the shell can play a certain cooling role in the stator core.
When cold oil flows from the main line to the branch line of the shell flow channel, the flow channel is prevented from being blocked, the flow is ensured to be uniform, a branch oil channel baffle 16 for branching the cooling oil main line is further arranged in the shell oil channel 11 of the upper motor shell 1, and the branch oil channel baffle is opposite to the motor oil inlet 5.
After flowing through the interior of the motor, the cooling oil is deposited on the bottom of the motor. Therefore, the cooling oil recovery port 14 communicating with the casing oil passage 11 having the oil outlet function is provided on the inner wall of the lower casing 18, the casing oil passage 11 having the oil outlet function is provided on the lower casing 18, the motor oil outlet 15 is provided on the rotating surface of the lower casing 18, and the cooling oil can slowly flow out of the interior of the motor.
However, in order to ensure the cooling oil discharging effect, the height of the motor oil outlet 15 does not exceed the height of the cooling oil recovery port 14. The higher the liquid level is, the larger the oil outlet area of the oil outlet is, the more the oil outlet is facilitated, and therefore the liquid level of the cooling oil is guaranteed not to exceed the air gap of the motor to influence the rotation efficiency of the motor.
To sum up, this scheme adopts the oil cooling mode, utilizes casing and end cover runner design to make coolant get into motor casing 1 and 3 insides of pivot respectively, directly sprays the cooling to the inside winding head portion of motor, directly cools off motor rotor 7 and bearing through at 3 inside certain runners of design of pivot, finally retrieves the inside coolant oil of motor under the prerequisite of guaranteeing certain liquid level height through the structure is retrieved to motor casing 1 bottom coolant oil. This scheme can effectively improve the cooling efficiency of motor, can effectively cool off rotor magnet steel simultaneously, reduces the magnet steel temperature rise, promotes the motor output performance under high-speed operating mode.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed herein be covered by the appended claims.
Claims (6)
1. A permanent magnet synchronous motor oil cooling structure is characterized in that a rotating shaft provided with a motor rotor is matched in a motor shell through a motor bearing, and a motor end cover is arranged at the end part of the motor shell; the motor shell is provided with a shell oil duct; the motor end cover is provided with an end cover oil duct; the rotating shaft is provided with a rotating shaft oil duct; the motor rotor is provided with a rotor oil guide channel; the method is characterized in that: a shell oil duct with an oil inlet function is arranged in the upper motor shell; a shell oil duct with an oil outlet function is arranged in the lower motor shell; a shell oil inlet of a shell oil duct with an oil inlet function is formed in the end face of the upper motor shell; a motor oil outlet of a shell oil passage with an oil outlet function is arranged on the motor shell at the lower side; a cooling oil recovery port communicated with a shell oil duct with an oil outlet function is arranged on the inner wall of the lower motor shell; the end cover oil passage is respectively communicated with the shell oil inlet and the rotating shaft oil passage; the rotating shaft is provided with a rotor oil inlet hole which is communicated with the rotating shaft oil duct and the rotor oil guide channel; the rotating shaft oil passage is communicated to an end part outlet of the motor rotor; and the motor rotor is also provided with a bearing oil spray hole which is communicated with the rotating shaft oil duct and faces the motor bearing.
2. The oil cooling structure of the permanent magnet synchronous motor according to claim 1, characterized in that: an oil channel baffle plate for cooling oil branch line shunting is also arranged in the shell oil channel of the motor shell on the upper side; the oil duct baffles are symmetrically distributed by taking the axial plane where the motor oil inlet is located as a symmetric central plane.
3. The oil cooling structure of the permanent magnet synchronous motor according to claim 1, characterized in that: and a motor oil inlet leading to the end cover oil duct is formed in the motor end cover.
4. The oil cooling structure of the permanent magnet synchronous motor according to claim 1, characterized in that: a split oil channel baffle plate for splitting a cooling oil main line is further arranged in the shell oil channel of the motor shell on the upper side; the sub-runner baffle is over against the oil inlet of the motor.
5. The oil cooling structure of the permanent magnet synchronous motor according to claim 1, characterized in that: and a shell oil spray hole communicated with a shell oil duct with an oil outlet function is formed in the inner wall of the motor shell.
6. The oil cooling structure of the permanent magnet synchronous motor according to claim 1, characterized in that: the height of the motor oil outlet is not more than that of the cooling oil recovery port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811336780.1A CN111181300A (en) | 2018-11-12 | 2018-11-12 | Oil cooling structure of permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811336780.1A CN111181300A (en) | 2018-11-12 | 2018-11-12 | Oil cooling structure of permanent magnet synchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN111181300A true CN111181300A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811336780.1A Pending CN111181300A (en) | 2018-11-12 | 2018-11-12 | Oil cooling structure of permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN111181300A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234771A (en) * | 2020-09-16 | 2021-01-15 | 盖耀辉 | Oil cooling structure of traction motor |
| CN112421889A (en) * | 2020-12-11 | 2021-02-26 | 合肥巨一动力系统有限公司 | Three-in-one oil cold and hot driving structure |
| CN112421833A (en) * | 2020-12-11 | 2021-02-26 | 合肥巨一动力系统有限公司 | Oil cooling rotor structure |
| CN113922567A (en) * | 2021-10-12 | 2022-01-11 | 臻驱科技（上海）有限公司 | Electric drive system and copper bar oil cooling structure of electric drive system |
| CN115833481A (en) * | 2023-02-08 | 2023-03-21 | 深圳市鸿明机电有限公司 | Double-cooling motor |
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| US4541736A (en) * | 1984-04-30 | 1985-09-17 | Beckman Instruments, Inc. | Centrifugal oil pump flow proportioning and cooling system |
| CN203554162U (en) * | 2013-10-30 | 2014-04-16 | 大洋电机新动力科技有限公司 | Motor structure with internal oil cooling |
| CN205429991U (en) * | 2016-02-03 | 2016-08-03 | 中山大洋电机股份有限公司 | Cooling structure of motor |
| CN206149098U (en) * | 2016-09-27 | 2017-05-03 | 比亚迪股份有限公司 | Cold motor of oil and vehicle |
| CN206922591U (en) * | 2017-05-22 | 2018-01-23 | 比亚迪股份有限公司 | A kind of motor with cooling oil path |
| CN207039387U (en) * | 2017-07-06 | 2018-02-23 | 明程电机技术（深圳）有限公司 | The cooling structure of oil-cooled motor |
| CN108512363A (en) * | 2018-04-10 | 2018-09-07 | 浙江兴轮电驱动有限公司 | A kind of oil-cooled motor |
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2018
- 2018-11-12 CN CN201811336780.1A patent/CN111181300A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4541736A (en) * | 1984-04-30 | 1985-09-17 | Beckman Instruments, Inc. | Centrifugal oil pump flow proportioning and cooling system |
| CN203554162U (en) * | 2013-10-30 | 2014-04-16 | 大洋电机新动力科技有限公司 | Motor structure with internal oil cooling |
| CN205429991U (en) * | 2016-02-03 | 2016-08-03 | 中山大洋电机股份有限公司 | Cooling structure of motor |
| CN206149098U (en) * | 2016-09-27 | 2017-05-03 | 比亚迪股份有限公司 | Cold motor of oil and vehicle |
| CN206922591U (en) * | 2017-05-22 | 2018-01-23 | 比亚迪股份有限公司 | A kind of motor with cooling oil path |
| CN207039387U (en) * | 2017-07-06 | 2018-02-23 | 明程电机技术（深圳）有限公司 | The cooling structure of oil-cooled motor |
| CN108512363A (en) * | 2018-04-10 | 2018-09-07 | 浙江兴轮电驱动有限公司 | A kind of oil-cooled motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234771A (en) * | 2020-09-16 | 2021-01-15 | 盖耀辉 | Oil cooling structure of traction motor |
| CN112421889A (en) * | 2020-12-11 | 2021-02-26 | 合肥巨一动力系统有限公司 | Three-in-one oil cold and hot driving structure |
| CN112421833A (en) * | 2020-12-11 | 2021-02-26 | 合肥巨一动力系统有限公司 | Oil cooling rotor structure |
| WO2022121549A1 (en) * | 2020-12-11 | 2022-06-16 | 合肥巨一动力系统有限公司 | Three-in-one oil cooling electric driving structure |
| CN112421889B (en) * | 2020-12-11 | 2022-08-02 | 合肥巨一动力系统有限公司 | Three-in-one oil cold and hot driving structure |
| CN113922567A (en) * | 2021-10-12 | 2022-01-11 | 臻驱科技（上海）有限公司 | Electric drive system and copper bar oil cooling structure of electric drive system |
| CN113922567B (en) * | 2021-10-12 | 2023-01-20 | 臻驱科技（上海）有限公司 | Electric drive system and copper bar oil cooling structure of electric drive system |
| CN115833481A (en) * | 2023-02-08 | 2023-03-21 | 深圳市鸿明机电有限公司 | Double-cooling motor |
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Application publication date: 20200519 |