CN209896865U - Efficient oil-cooled permanent magnet synchronous motor - Google Patents
Efficient oil-cooled permanent magnet synchronous motor Download PDFInfo
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- CN209896865U CN209896865U CN201920867260.7U CN201920867260U CN209896865U CN 209896865 U CN209896865 U CN 209896865U CN 201920867260 U CN201920867260 U CN 201920867260U CN 209896865 U CN209896865 U CN 209896865U
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Abstract
A high-efficiency oil-cooled permanent magnet synchronous motor comprises a shell, wherein a stator assembly and a rotor assembly are arranged in the shell; the rotor assembly comprises a rotating shaft, a rotor punching sheet set and a rotor pressing plate; an oil inlet is formed in the shell, a cavity communicated with the oil inlet is formed in the rotating shaft, and an oil throwing hole communicated with the cavity is formed in the rotating shaft; an oil passing channel communicated with the oil throwing hole is arranged on the central hole wall of the rotor punching sheet group; an annular oil passing groove and a radial oil passing groove are formed in the end face, close to the rotor punching sheet group, of each rotor pressing plate; the annular oil passing groove is communicated with each oil passing channel; the end part of each radial oil passing groove facing the axis of the rotating shaft is communicated with the annular oil passing groove, and the other end of each radial oil passing groove is communicated with an oil passing gap between the shell and the stator assembly; an oil collecting groove is formed in the bottom of the inner wall of the shell, an oil return hole is formed in the bottom of the oil collecting groove, and the oil return hole is communicated with the oil inlet through an external channel.
Description
Technical Field
The utility model relates to a PMSM field especially relates to a PMSM that water-cooling and oil-cooling combined together that is applicable to new forms of energy electric automobile.
Background
The permanent magnet synchronous motor is a power source of a new energy automobile, the motor is used as a key component for mutually converting a power supply and mechanical energy, plays an important role in the aspect of new source power, and the conversion efficiency and the working reliability and stability of the motor also become key points of technical attack in the industry. The existing permanent magnet synchronous motor needs to work efficiently and stably under various severe working conditions, and heat dissipation is an important problem. In particular, in high-power motors, the problem of heat dissipation is particularly pronounced without increasing the volume or weight.
In the prior art, a rotor and an oil storage surface are tangent to throw oil; the problems of the heat dissipation method are as follows: the rotor contacts with the oil deposit, when the rotor gets up, there is the condition of stirring oil, and the resistance of stirring oil is great, especially when the motor rotates at a high speed, drags motor speed seriously, has very big power loss.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high-efficient oil-cooling PMSM, aim at solve the heat dissipation problem of motor, especially the inside problem that forms the heat island of motor, especially to the heat dissipation problem of winding group tip in the stator module.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the relevant content in the above technical solution is explained as follows: a high-efficiency oil-cooled permanent magnet synchronous motor comprises a shell, wherein a stator assembly and a rotor assembly are arranged in the shell; the rotor assembly comprises a rotating shaft, a rotor punching sheet group arranged on the rotating shaft and rotor pressing plates arranged at two axial ends of the rotor punching sheet group;
the shell is provided with an oil inlet, a cavity is arranged in the rotating shaft along the axis direction of the rotating shaft, the cavity extends to be communicated with the oil inlet, an oil throwing hole is arranged on the rotating shaft along the radial direction of the rotating shaft, and the oil throwing hole is communicated with the cavity;
an oil passing channel is formed in the central hole wall of the rotor punching sheet group along the axial direction of the central hole wall, and the oil passing channel is communicated with the oil throwing hole;
an annular oil passing groove and a radial oil passing groove are formed in the end face, close to the rotor punching sheet group, of each rotor pressing plate; the annular oil passing groove is arranged around the axial lead of the rotor pressing plate for one circle and is communicated with each oil passing channel; the radial oil passing grooves are arranged along the radial direction of the rotor pressing plate, a plurality of radial oil passing grooves are uniformly distributed in the circumferential direction of the rotor pressing plate, the end part of each radial oil passing groove facing the axis of the rotating shaft is communicated with the annular oil passing groove, and the other end of each radial oil passing groove faces the end part of the stator winding of the stator assembly;
an oil passing gap is reserved between the machine shell and the stator winding end part of the stator assembly and is communicated with one end, facing the stator winding end part, of the radial oil passing groove;
an oil collecting groove is formed in the bottom of the inner wall of the shell, an oil return hole is formed in the bottom of the oil collecting groove, and the oil return hole is communicated with the oil inlet through an external channel;
under the working state, oil in the oil collecting tank flows to the oil passing channel through the oil return hole, the external channel, the oil inlet, the cavity and the oil throwing hole in sequence, then is divided to two axial ends of the rotor punching sheet group by the oil passing channel, splashes to the end part of the stator winding under the action of centrifugal force through the annular oil passing groove and the plurality of radial oil passing grooves, and finally returns to the oil collecting tank along the inner wall of the shell under the action of gravity, so that an oil circulation passage is formed.
1. In the scheme, the oil collecting tank is internally provided with the filter screen.
2. In the above scheme, the rotor pressing plate and the end face, against which the rotor punching sheet group leans, of the rotor punching sheet group are further provided with an end face oil passing groove, the end face oil passing groove is arranged along the radial direction of the rotor pressing plate, one end, passing through the oil groove, of the end face is communicated with the annular oil passing groove, and the other end of the end face is communicated with the center hole of the rotor pressing plate.
3. In the above scheme, the external passage includes a cold oil pump and a heat exchanger, the heat exchanger is used for cooling the oil which comes out from the inside of the motor and absorbs heat, and the cold oil pump is used for injecting the cooled oil into the cavity.
Compared with the prior art, the utility model have following advantage:
1. the motor of the utility model has better heat dissipation effect, no heat island is formed inside, and especially the end part of the stator winding of the stator component can carry away heat through oil; the structure is simple, the oil way forms circulation in the motor to form a whole, and the motor can stably work under various severe working conditions.
2. The utility model discloses a motor is because the radiating effect is good, has improved the work efficiency of motor, has improved the reliability under the high-speed operating mode of motor.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of the rotor sheet structure of the present invention;
FIG. 3 is a schematic structural view of a rotor pressing plate of the present invention;
fig. 4 is a schematic diagram of the oil circuit of the present invention.
In the above drawings: 1. a housing; 11. an end cap; 111. an oil inlet; 2. a stator assembly; 31. a rotating shaft; 311. a cavity; 312. an oil throwing hole; 32. punching a rotor sheet group; 321. rotor punching sheets; 3211. the iron core passes through the oil groove; 32111. an oil passing channel; 33. a rotor pressing plate; 331. an annular oil passing groove; 332. a radial oil passing groove; 333. the end surface is provided with an oil groove; 4. an oil sump; 41. a filter screen; 42. an oil discharge port; 43. an oil return hole; 51. an oil filter; 52. an oil pump; 53. an oil injection pipe; 61. a water inlet; 62. a water outlet; 7. an air gap; 8. the oil passing gap.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
the first embodiment is as follows:
a high-efficiency oil-cooled permanent magnet synchronous motor is shown in figure 1 and comprises a shell 1, wherein the shell 1 is composed of a cylinder body and end covers 11 at two ends of the cylinder body, a stator assembly 2 and a rotor assembly are arranged in the shell 1, and an air gap 7 is reserved between the stator assembly 2 and the rotor assembly; the rotor assembly comprises a rotating shaft 31, a rotor punching sheet group 32 arranged on the rotating shaft 31 and rotor pressing plates 33 arranged at two axial ends of the rotor punching sheet group 32; the stator assembly 2 comprises a stator core and a stator winding; the rotor punching sheet group 32 is formed by overlapping a plurality of rotor punching sheets 321, and the rotor punching sheets 321 are in interference fit with the rotating shaft 31.
Referring to fig. 1, an oil inlet is formed in the housing 1, a cavity 311 is formed in the rotating shaft 31 along an axial direction of the rotating shaft, the cavity 311 extends to communicate with the oil inlet, an oil slinger hole 312 is formed in the rotating shaft 31 along a radial direction of the rotating shaft, and the oil slinger hole 312 is communicated with the cavity 311.
Referring to fig. 2, an oil passage 32111 is formed in a central hole wall of the rotor punching sheet set 32 along an axial direction thereof, and the oil passage 32111 is formed by a plurality of iron core oil passages 3211 formed in the central hole wall of the rotor punching sheet along the axial direction thereof; each rotor punching sheet is provided with at least one iron core oil passing groove 3211, so that the iron core oil passing grooves 3211 on the plurality of rotor punching sheets are communicated to form at least one oil passing channel 32111; specifically, each rotor punching is provided with three iron core oil passing grooves 3211 which are uniformly distributed in the circumferential direction, so that the iron core oil passing grooves 3211 on the plurality of rotor punching are communicated to form three oil passing channels 32111; the oil passing passage 32111 communicates with the oil slinger hole 312; specifically, when three oil passages 32111 are provided, two groups of three oil slinger holes 312 are provided, and each group of three oil slinger holes 312 is communicated with the oil passages 32111.
Referring to fig. 3, an annular oil passing groove 331 and a radial oil passing groove 332 are provided on an end surface of each rotor pressing plate 33, which is close to the rotor punching sheet group 32; the annular oil passing groove 331 is arranged around the axial lead of the rotor pressing plate 33, and the annular oil passing groove 331 is communicated with each oil passing channel 32111; the radial oil passing grooves 332 are arranged along the radial direction of the rotor pressure plate 33, a plurality of radial oil passing grooves 332 are uniformly distributed in the circumferential direction of the rotor pressure plate 33, the end part of each radial oil passing groove 332 facing the axis of the rotating shaft 31 is communicated with the annular oil passing groove 331, and the other end of each radial oil passing groove 332 is arranged facing the end part of the stator winding of the stator assembly 2.
Referring to fig. 3, an end surface oil passing groove 333 is further provided on an end surface of the rotor pressing plate 33, which is close to the rotor punching sheet group 32, the end surface oil passing groove 333 is arranged along a radial direction of the rotor pressing plate 33, one end of the end surface oil passing groove 333 is communicated with the annular oil passing groove 331, and the other end is communicated with a central hole of the rotor pressing plate; and oil for refrigeration enters the central hole of the rotor pressing plate through the end surface oil passing groove and flows to the bearing through the central hole to dissipate heat of the bearing.
An oil passing gap 8 is left between the machine shell 1 and the stator winding end part of the stator assembly 2, and the oil passing gap 8 is communicated with one end of the radial oil passing groove 332 facing the stator winding end part.
An oil collecting tank 4 is arranged at the bottom of the inner wall of the machine shell 1, a filter screen 41 is also arranged in the oil collecting tank 4, and the filter screen 41 is used for filtering sundries, such as scrap iron, in an oil way so as to prevent the motor from being damaged and the oil way from being blocked; the bottom of the oil collecting tank 4 is provided with an oil return hole 43 and an oil discharge hole 42; the oil discharge port 42 is convenient for oil filling and discharging in the motor before work; the oil return hole 43 is communicated with the oil inlet via an external passage.
The external channel comprises a cold oil pump (not shown in the drawings) for cooling the oil that has absorbed heat coming out of the interior of the machine, and a heat exchanger (not shown in the drawings) for injecting the cooled oil into the cavity for circulation. The cold oil pump and the heat exchanger are both in the prior art.
Oil starts from the oil groove and enters the heat exchanger through a pipeline, the heat exchanger cools the oil, and then the cooled oil is injected into the cavity of the rotating shaft from the oil inlet through the multi-cold-oil pump.
Referring to fig. 4, after the motor is rotated, oil flows to the oil passage of the rotor punching sheet group through two groups of oil throwing holes radially formed in the rotating shaft, then flows to the annular oil passing groove of the rotor pressing plate, is thrown out of the rotor from the radial oil passing groove, and splashes to the stator assembly on the periphery. Oil falls to the end part of the stator assembly (the end part of the stator winding) and also falls to the inner walls of the shell end cover and the like, and under the action of gravity, a small part of oil also falls to the oil collecting tank along the wall, is guided to the bearing through the groove on the wall of the shell end cover, and finally falls to the oil collecting tank again, so that the circulation is repeated. The oil is accelerated twice in the whole system, the first time is that the oil is pumped into the cavity of the rotating shaft from the oil collecting tank at the bottom of the machine shell through the gear oil pump, the second time of acceleration is that the rotor assembly is accelerated radially in the flow channel towards the rotor assembly under the action of centrifugal force when rotating at high speed, and finally high kinetic energy is obtained and flies out from the tangential direction of the rotor assembly at a certain included angle and is knocked down at the end part of a winding or the end cover of the stator iron core and the machine shell to take away heat.
The oil having absorbed heat enters the oil sump and then circulates as described above.
Example two:
referring to the attached drawings 1-4, the high-efficiency oil-cooled permanent magnet synchronous motor comprises a shell 1, wherein the shell is composed of a cylinder body and end covers 11 at two ends of the cylinder body, a stator assembly 2 and a rotor assembly are arranged in the shell 1, and an air gap 7 is reserved between the stator assembly 2 and the rotor assembly; the rotor assembly comprises a rotating shaft 31, a rotor punching sheet group 32 arranged on the rotating shaft 31 and rotor pressing plates 33 arranged at two axial ends of the rotor punching sheet group 32; the stator assembly 2 comprises a stator core and a stator winding; the rotor punching sheet group 32 is formed by overlapping a plurality of stator punching sheets 321, and the rotor punching sheets 321 are in interference fit with the rotating shaft 31.
An oil inlet is formed in the machine shell 1, a cavity 311 is formed in the rotating shaft 31 along the axis direction of the rotating shaft, the cavity 311 extends to be communicated with the oil inlet, an oil throwing hole 312 is formed in the rotating shaft 31 along the radial direction of the rotating shaft, and the oil throwing hole 312 is communicated with the cavity 311.
An oil passing channel 32111 is formed in the central hole wall of the rotor punching sheet group 32 along the axial direction of the central hole wall, and the oil passing channel 32111 is formed by iron core oil passing grooves 3211 formed in the central hole walls of the rotor punching sheets along the axial direction of the central hole walls; each rotor punching sheet is provided with at least one iron core oil passing groove 3211, so that the iron core oil passing grooves 3211 on the plurality of rotor punching sheets are communicated to form at least one oil passing channel 32111; specifically, each rotor punching is provided with three iron core oil passing grooves 3211 which are uniformly distributed in the circumferential direction, so that the iron core oil passing grooves 3211 on the plurality of rotor punching are communicated to form three oil passing channels 32111; the oil passing passage 32111 communicates with the oil slinger hole 312; specifically, when three oil passages 32111 are provided, two groups of three oil slinger holes 312 are provided, and each group of three oil slinger holes 312 is communicated with the oil passages 32111.
An annular oil passing groove 331 and a radial oil passing groove 332 are arranged on the end surface of each rotor pressing plate 33, which is close to the rotor punching plate group 32; the annular oil passing groove 331 is arranged around the axial lead of the rotor pressing plate 33, and the annular oil passing groove 331 is communicated with each oil passing channel 32111; the radial oil passing grooves 332 are arranged along the radial direction of the rotor pressure plate 33, a plurality of radial oil passing grooves 332 are uniformly distributed in the circumferential direction of the rotor pressure plate 33, the end part of each radial oil passing groove 332 facing the axis of the rotating shaft 31 is communicated with the annular oil passing groove 331, and the other end of each radial oil passing groove 332 is arranged facing the end part of the stator winding of the stator assembly 2.
An oil passing gap 8 is left between the machine shell 1 and the stator winding end part of the stator assembly 2, and the oil passing gap 8 is communicated with one end of the radial oil passing groove 332 facing the stator winding end part.
An oil collecting tank 4 is arranged at the bottom of the inner wall of the machine shell 1, a filter screen 41 is also arranged in the oil collecting tank 4, and the filter screen 41 is used for filtering sundries, such as scrap iron, in an oil way so as to prevent the motor from being damaged and the oil way from being blocked; the bottom of the oil collecting tank 4 is provided with an oil return hole 43 and an oil discharge hole 42; the oil discharge port 42 is convenient for oil filling and discharging in the motor before work; the oil return hole 43 is communicated with the oil inlet via an external passage.
The external passage includes an oil pump 52; the oil return hole 43 is communicated with the oil inlet through an oil pump 52; an oil filter 51 is further arranged between the oil return hole 43 and the oil pump 52, the oil filter 51 prevents foreign matters mixed in an oil path from damaging the oil pump 52, the oil return hole 43 is communicated with the oil filter 51 through an oil pipe, and the oil filter 51 is communicated with the oil pump 52 through the oil pipe; the oil pump 52 is installed on the end cover 11 of the housing and is provided with a sealing device, an oil outlet of the oil pump 52 is connected with an oil injection pipe 53, and the oil injection pipe 53 extends into the cavity 311.
The oil pump 52 is a gear oil pump 52, and the gear oil pump 52 comprises a direct current motor and a gear pump head, and the direct current motor needs to provide a corresponding direct current power supply (DC 24V/DC 24V).
In a working state, oil in the oil collecting tank 4 sequentially flows to the oil passing channel 32111 through the oil return hole 43, the oil pump 52, the oil inlet, the cavity 311 and the oil throwing hole 312, is then distributed to two axial ends of the rotor punching sheet set 32 through the oil passing channel 32111, splashes to the end of the stator winding under the action of centrifugal force through the annular oil passing channel 331 and the plurality of radial oil passing channels 332, and finally returns to the oil collecting tank 4 along the inner wall of the housing under the action of gravity, so that an oil circulation passage is formed; the oil can be ATF oil, which has high heat conductivity coefficient and insulating effect.
A cold water channel is arranged in the shell wall of the machine shell 1, one end of the cold water channel is connected with a water inlet 61 for introducing cooling water, and the other end of the cold water channel is also connected with a water outlet 62; the cold water passage is prior art.
Specifically, the housing is formed by processing aluminum alloy with high thermal conductivity.
Oil is pumped into an oil pump from an oil groove through an oil pipe and an oil filter; the outlet of the oil pump is provided with an oil injection pipe which directly injects high-pressure oil into the cavity of the rotating shaft. When the motor rotates, oil flows to the oil passing channel of the rotor punching sheet group through two groups of oil throwing holes radially formed in the rotating shaft, then flows to the annular oil passing groove of the rotor pressing plate, is thrown out of the rotor from the radial oil passing groove, and splashes to the stator assembly on the periphery. Oil falls to the end part of the stator assembly (the end part of the stator winding) and also falls to the inner walls of the shell end cover and the like, and under the action of gravity, a small part of oil also falls to the oil collecting tank along the wall, is guided to the bearing through the groove on the wall of the shell end cover, and finally falls to the oil collecting tank again, so that the circulation is repeated. The oil is accelerated twice in the whole system, the first time is that the oil is pumped into the cavity of the rotating shaft from the oil collecting tank at the bottom of the machine shell through the gear oil pump, the second time of acceleration is that the rotor assembly is accelerated radially in the flow channel towards the rotor assembly under the action of centrifugal force when rotating at high speed, and finally high kinetic energy is obtained and flies out from the tangential direction of the rotor assembly at a certain included angle and is knocked down at the end part of a winding or the end cover of the stator iron core and the machine shell to take away heat.
The oil hitting the inner wall of the shell is cooled through a cold water channel on the shell, so that the oil can be recycled.
The heat exchange of the cold water channel is only an example, and the cold water channel can be matched with oil cooling through air cooling and other refrigeration modes.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (4)
1. A high-efficiency oil-cooled permanent magnet synchronous motor comprises a shell, wherein a stator assembly and a rotor assembly are arranged in the shell; the rotor assembly comprises a rotating shaft, a rotor punching sheet group arranged on the rotating shaft and rotor pressing plates arranged at two axial ends of the rotor punching sheet group; the method is characterized in that:
the shell is provided with an oil inlet, a cavity is arranged in the rotating shaft along the axis direction of the rotating shaft, the cavity extends to be communicated with the oil inlet, an oil throwing hole is arranged on the rotating shaft along the radial direction of the rotating shaft, and the oil throwing hole is communicated with the cavity;
an oil passing channel is formed in the central hole wall of the rotor punching sheet group along the axial direction of the central hole wall, and the oil passing channel is communicated with the oil throwing hole;
an annular oil passing groove and a radial oil passing groove are formed in the end face, close to the rotor punching sheet group, of each rotor pressing plate; the annular oil passing groove is arranged around the axial lead of the rotor pressing plate for one circle and is communicated with each oil passing channel; the radial oil passing grooves are arranged along the radial direction of the rotor pressing plate, a plurality of radial oil passing grooves are uniformly distributed in the circumferential direction of the rotor pressing plate, the end part of each radial oil passing groove facing the axis of the rotating shaft is communicated with the annular oil passing groove, and the other end of each radial oil passing groove is arranged facing the end part of the stator winding of the stator assembly;
an oil passing gap is reserved between the machine shell and the stator winding end part of the stator assembly and is communicated with one end, facing the stator winding end part, of the radial oil passing groove;
an oil collecting groove is formed in the bottom of the inner wall of the shell, an oil return hole is formed in the bottom of the oil collecting groove, and the oil return hole is communicated with the oil inlet through an external channel;
under the working state, oil in the oil collecting tank flows to the oil passing channel through the oil return hole, the external channel, the oil inlet, the cavity and the oil throwing hole in sequence, then is divided to two axial ends of the rotor punching sheet group by the oil passing channel, splashes to the end part of the stator winding under the action of centrifugal force through the annular oil passing groove and the plurality of radial oil passing grooves, and finally returns to the oil collecting tank along the inner wall of the shell under the action of gravity, so that an oil circulation passage is formed.
2. The efficient oil-cooled permanent magnet synchronous motor according to claim 1, characterized in that: a filter screen is arranged in the oil collecting tank.
3. The efficient oil-cooled permanent magnet synchronous motor according to claim 1, characterized in that: the rotor pressing plate and the end face, close to the rotor punching sheet group, of the rotor punching sheet group are further provided with end face oil passing grooves, the end faces pass through the oil grooves and are arranged along the radial direction of the rotor pressing plate, one end, passing through the oil grooves, of the end faces is communicated with the annular oil passing grooves, and the other end of the end faces is communicated with the center hole of the rotor pressing plate.
4. The efficient oil-cooled permanent magnet synchronous motor according to claim 1, characterized in that: the external passage includes a cold oil pump for injecting cooled oil into the cavity and a heat exchanger for cooling the heat absorbed oil from inside the motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920867260.7U CN209896865U (en) | 2019-06-11 | 2019-06-11 | Efficient oil-cooled permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920867260.7U CN209896865U (en) | 2019-06-11 | 2019-06-11 | Efficient oil-cooled permanent magnet synchronous motor |
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| CN209896865U true CN209896865U (en) | 2020-01-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086296A (en) * | 2019-06-11 | 2019-08-02 | 苏州朗高电机有限公司 | A kind of cold permanent magnet synchronous motor of high efficient oil |
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2019
- 2019-06-11 CN CN201920867260.7U patent/CN209896865U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086296A (en) * | 2019-06-11 | 2019-08-02 | 苏州朗高电机有限公司 | A kind of cold permanent magnet synchronous motor of high efficient oil |
| CN110086296B (en) * | 2019-06-11 | 2024-03-01 | 苏州朗高电机有限公司 | High-efficiency oil-cooled permanent magnet synchronous motor |
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Address after: No.608, FanFeng Road, Xukou Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: SUZHOU LEGO MOTORS Co.,Ltd. Address before: 215000 Hefeng Road, Hefeng Town, Wuzhong District Town, Suzhou, Jiangsu Patentee before: SUZHOU LEGO MOTORS Co.,Ltd. |
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