CN209896863U

CN209896863U - Water-cooling and oil-cooling combined permanent magnet synchronous motor

Info

Publication number: CN209896863U
Application number: CN201920867131.8U
Authority: CN
Inventors: 江轶
Original assignee: SUZHOU LEGO MOTORS CO Ltd
Current assignee: SUZHOU LEGO MOTORS CO Ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-01-03
Anticipated expiration: 2029-06-11

Abstract

A water-cooling and oil-cooling combined permanent magnet synchronous motor comprises a shell, wherein a stator assembly and a rotor assembly are arranged in the shell, and 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; the rotor punching sheet group is provided with an oil passing channel communicated with the oil throwing hole; the rotor pressing plate is provided with an annular oil passing groove and a radial oil passing groove; 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 the oil passing gap reserved between the shell and the stator assembly; an oil collecting tank is arranged at the bottom of the inner wall of the shell, an oil return hole is arranged at the bottom of the oil collecting tank, and the oil return hole is communicated with the oil inlet through an oil pump; and a cold water channel is arranged in the shell wall of the shell, one end of the cold water channel is connected with a water inlet used as a cooling water inlet, and the other end of the cold water channel is also connected with a water outlet used as a cooling water outlet.

Description

Water-cooling and oil-cooling combined permanent magnet synchronous motor

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 play 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.

The prior art mainly has two heat dissipation methods:

firstly, the rotor and the 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.

Secondly, all oil in the shell is cooled, and simultaneously, the oil temperature is cooled by a shell external heating exchanger; the problems of the heat dissipation method are as follows: the motor structure is more complicated, and the cooling oil circuit can not be integrated at the inside integrative that forms of motor, need extend to the place beyond the motor with oil pipe to still need to join in marriage the heat exchanger of certain power, the increase cost, and the reliability is not high, has to reveal oil, perhaps sneaks into risks such as impurity in the oil, and the motor wholeness is poor, and anti-vibration ability is poor, and motor comprehensive efficiency is not high shortcoming.

SUMMERY OF THE UTILITY MODEL

The utility model provides a water-cooling and oil-cooling combined permanent magnet synchronous motor, 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 stator module tip.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a water-cooling and oil-cooling combined 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 tank is arranged at the bottom of the inner wall of the shell, an oil return hole is arranged at the bottom of the oil collecting tank, and the oil return hole is communicated with the oil inlet through an oil pump;

under the working state, oil in the oil collecting tank flows to the oil passing channel through the oil return hole, the oil pump, 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, is gathered to the end part of the stator winding through the annular oil passing groove and the plurality of radial oil passing grooves, and finally returns to the oil collecting tank through the oil passing gap to form an oil circulation passage;

and a cold water channel is arranged in the shell wall of the shell, one end of the cold water channel is connected with a water inlet used as a cooling water inlet, and the other end of the cold water channel is also connected with a water outlet used as a cooling water outlet.

The relevant content in the above technical solution is explained as follows:

1. in the above scheme, the cold water channel comprises two end surface channel sections, and the two end surface channel sections are respectively arranged in the wall surfaces at the two axial ends of the casing.

2. In the above solution, the end surface channel section is formed by channels arranged spirally in a plane.

3. In the above scheme, the cold water channel comprises a channel bottom channel section located at the bottom of the oil collecting channel.

4. In the above scheme, an S-shaped water channel is circumferentially arranged inside the circumferential wall of the casing, and a portion of the S-shaped water channel, which corresponds to the bottom of the oil collecting tank, serves as the channel section of the tank bottom.

The utility model discloses the theory of operation is:

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 in a flow channel radially under the action of centrifugal force when rotating at high speed, and finally non-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 positions of a stator iron core, a machine shell end cover and the like 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.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the motor of the utility model combines the cold water channel with the oil cooling structure, namely, the motor is cooled by oil and the shell is cooled by water; the novel composite heat dissipation cooling mode realizes better heat dissipation effect of the motor, no heat island is formed inside the motor, and especially the end part of the stator winding of the stator assembly 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; 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:

referring to fig. 1-4, a permanent magnet synchronous motor combining water cooling and oil cooling comprises a casing 1, the casing is composed of a cylinder and end covers 11 at two ends of the cylinder, a stator assembly 2 and a rotor assembly are arranged in the casing 1, and an air gap 7 is left 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 111 is formed in the housing 1, a cavity 311 is formed in the rotating shaft 31 along the axial direction of the rotating shaft, the cavity 311 extends to be communicated with the oil inlet, an oil slinger hole 312 is formed in the rotating shaft 31 along the radial direction of the rotating shaft, and the oil slinger 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 111 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, passes through the annular oil passing channel 331 and the plurality of radial oil passing channels 332, is thrown to the winding end and returns to the oil collecting tank 4 through the oil gap 8, so that an oil circulation passage is formed; the oil can be ATF oil, which has high heat conductivity coefficient and insulating effect.

In addition, a cold water channel is provided inside the shell wall of the housing 1, one end of the cold water channel is connected to a water inlet 61 for introducing cooling water, and the other end is also connected to a water outlet 62.

Specifically, the housing is formed by processing aluminum alloy with high thermal conductivity. Specifically, the cold water channel comprises two end surface channel sections which are respectively arranged in the wall surfaces at two axial ends of the machine shell 1; the end surface channel section is formed by channels spirally arranged in a plane; the end surface channel cools oil which splashes to the inner wall of the end surface and absorbs heat, and a better cooling effect is achieved.

Specifically, the cold water channel includes a bottom channel section at the bottom of the oil collecting tank 4, and since oil absorbing heat will eventually fall by gravity into the oil collecting tank 4, and the heat of the oil collecting tank 4 will be higher than elsewhere, there is intentionally a bottom channel section at the bottom of the oil collecting tank 4, which may be a grid-like, "s" shape, or the like.

Furthermore, an S-shaped water channel is also arranged in the circumferential wall of the casing 1 in the circumferential direction, and the portion of the S-shaped water channel corresponding to the bottom of the oil collecting tank 4 is used as the channel section of the tank bottom, and the S-shaped water channel is the prior art; the trough bottom channel section in this case can be selected from the existing prior art or from the above-mentioned specially designed trough bottom channel section.

The above-mentioned cold water channel structure is only an example, and can also be the cold water channel of other structures, and it is important that the cold water channel can cool the oil temperature, realizes the purpose that water cooling combines oil cooling to dispel the heat to the motor.

The heat dissipation principle is as follows: the temperature rises after the splashed oil absorbs the heat energy of the stator assembly 2 and the bearing and converges into the oil collecting tank 4, the oil collecting tank 4 is integrated with the machine shell 1 and is formed by processing aluminum alloy with high heat conductivity, and cooling water is introduced into a cold water channel of the machine shell 1, so that the heat absorbed by the oil can be timely transmitted to the machine shell 1 and taken away by the cooling water, and the oil temperature in the oil collecting tank 4 is always kept not too high.

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

1. A water-cooling and oil-cooling combined 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;

2. The water-cooled and oil-cooled combined permanent magnet synchronous motor according to claim 1, characterized in that: the cold water channel comprises two end surface channel sections which are respectively arranged in the wall surfaces at two axial ends of the casing.

3. The water-cooled and oil-cooled combined permanent magnet synchronous motor according to claim 2, characterized in that: the end channel section is formed by channels arranged spirally in a plane.

4. The water-cooled and oil-cooled combined permanent magnet synchronous motor according to claim 1 or 3, characterized in that: the cold water channel comprises a channel bottom channel section located at the bottom of the oil collecting channel.

5. The water-cooled and oil-cooled combined permanent magnet synchronous motor according to claim 4, characterized in that: and an S-shaped water channel is arranged in the circumferential wall of the machine shell in the circumferential direction, and the part of the S-shaped water channel, which is correspondingly positioned at the bottom of the oil collecting groove, is used as the channel section of the groove bottom.