A rotor liquid-cooled permanent magnet motor

Abstract

The present invention relates to the field of motor technology, and specifically to a rotor liquid-cooled permanent magnet motor, comprising an oil pump assembly, a heat dissipation tank, an external oil radiator, a base, a rotor, a stator, bearings, end caps, and a bearing outer cap. The cross section of the rotor core is provided with a rotor core center hole, an inner ring axial hole, a middle ring axial hole, and an outer ring axial hole. The large journal diameter of the motor shaft assembly is greater than the distance between the proximal end of the outer ring axial hole and the axial centerline of the motor shaft assembly. The motor shaft assembly has six shaft oil inlet passages and six shaft oil return passages. When the motor is operating, the hydraulic oil in the heat dissipation tank is transported to the main oil inlet by the impeller and guide wheel after passing through the filter cover and then into the rotor core. The hydraulic oil returns to the heat dissipation tank from the shaft return passage and the main oil outlet. The permanent magnet synchronous motor oil cooling system manufactured using this technical solution is simple and low-cost, with uniform rotor heat dissipation and stable motor performance, meeting the market demand for high-performance and high-reliability permanent magnet synchronous motors.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor liquid-cooled permanent magnet motor. Background Art

[0002] Currently, with the coordinated progress in the three major fields of artificial intelligence, electromechanics, and energy, electric motor technology has also achieved certain developments. Users are placing increasingly higher demands on the power density of motors. To improve the power density of motors, the application range of high-power-density permanent magnet synchronous motors is becoming increasingly wider. However, the higher the power density of permanent magnet synchronous motors, the higher the temperature rise of permanent magnet synchronous motors will be. Permanent magnet synchronous motors have the problem of excessive temperature rise. The magnetic properties of permanent magnets in permanent magnet synchronous motors change with temperature. When the temperature rises, the magnetic properties of permanent magnets weaken, leading to the risk of permanent magnet demagnetization, which has a certain impact on the performance of permanent magnet synchronous motors.

[0003] As the power density of permanent magnet synchronous motors (PMSMs) continues to increase, thermal management has become a crucial area of ​​motor design. Water-cooled PMSMs perform relatively poorly under high loads. Water-cooling technology for PMSMs cannot directly cool the motor's heat source, resulting in a long heat transfer path and low heat dissipation efficiency. Oil-cooling technology, with its higher heat dissipation efficiency, offers advantages in terms of excellent insulation and a wide temperature range. While existing oil-cooled PMSMs offer advantages in heat dissipation, the entire oil cooling system is complex and costly. Oil-cooled motors also suffer from uneven heat dissipation, which can easily generate hot spots and result in poor noise reduction. Summary of the Invention

[0004] In view of the shortcomings of existing technologies and products, the purpose of the present invention is to provide a rotor liquid-cooled permanent magnet motor to overcome the problems raised in the background technology, thereby developing and manufacturing a permanent magnet synchronous motor that meets the requirements of the background technology.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows: a rotor liquid-cooled permanent magnet motor includes an oil pump assembly, a heat dissipation oil tank, an external oil radiator, a machine base, a rotor, a stator, a bearing, an end cover, and a bearing outer cover;

[0006] The rotor is composed of a rotor core, permanent magnets, a motor shaft assembly, and a rotor end cover. The cross section of the rotor core is provided with a rotor core center hole, an inner ring axial hole, a middle ring axial hole, and an outer ring axial hole. The inner ring axial holes are provided with multiple channels, all of which are oil return channels. The middle ring axial holes are provided with multiple channels, and the number of the middle ring axial holes is the same as the number of the permanent magnets. The outer ring axial holes are provided with multiple channels, all of which are oil inlet channels. The permanent magnets are fixedly connected to the middle ring axial holes of the rotor core.

[0007] The motor shaft assembly is a bidirectional stepped shaft, and is provided with a shaft extension end, a small shaft neck, an iron core shaft seat, a rotor end seat, a large shaft neck, an oil inlet section, and an oil pump assembly connection section in sequence from the shaft extension end of the motor shaft assembly. The rotor end seat is provided with a rotor end seat oil inlet and a rotor end seat oil outlet on the side facing the rotor iron core. The rotor end seat is provided with a rotor end seat oil inlet channel and a rotor end seat oil return channel. The rotor end seat oil inlet is communicated with the rotor end seat oil return channel, and the rotor end seat oil outlet is communicated with the rotor The end seat oil inlet passages are connected, the large shaft neck and the oil inlet section are all provided with oil inlet passages, the large shaft neck, the oil inlet section, and the oil pump assembly connecting section are all provided with oil return passages, the oil inlet section is provided with a total oil inlet, and the oil pump assembly connecting section is provided with a total oil outlet. The rotor end seat oil inlet passage, the large shaft neck oil inlet passage, and the oil inlet section oil inlet passage are sequentially connected to form a shaft oil inlet passage, and the rotor end seat oil return passage, the large shaft neck oil return passage, the oil inlet section oil return passage, and the oil pump assembly connecting section oil return passage are sequentially connected to form a shaft oil return passage.

[0008] A rotor end cover oil inlet and a rotor end cover oil outlet are provided on a side of the rotor end cover facing the rotor core, and the rotor end cover oil inlet and the rotor end cover oil outlet are communicated with each other inside the rotor end cover;

[0009] The motor shaft assembly is inserted into the center hole of the rotor core from the shaft extension end, the center hole of the rotor core is matched with the core shaft seat, the end of the rotor core facing the rotor end seat is fixedly connected to the rotor end seat, the end of the rotor core facing away from the rotor end seat is fixedly connected to the rotor end cover, the oil inlet of the rotor end cover is communicated with the oil inlet channel on the rotor core, the oil outlet of the rotor end cover is communicated with the oil return channel on the rotor core, the oil outlet of the rotor end seat is communicated with the oil inlet channel on the rotor core, and the oil inlet of the rotor end seat is communicated with the oil return channel on the rotor core;

[0010] The stator is composed of a stator core with windings and a machine base. The stator core with windings is composed of a stator winding and a stator core. The stator winding is installed on the stator core, and the stator core is installed in the machine base.

[0011] There are two end covers, one is a front end cover, and the other is a rear end cover. The front end of the machine base is fixedly connected to the front end cover, and the rear end of the machine base is fixedly connected to the rear end cover. The shaft holes of the front end cover and the rear end cover are both provided with the bearings, and the bearings are respectively sleeved on the small shaft neck and the large shaft neck. The bearing outer cover is installed on the side of each end cover facing away from the machine base;

[0012] The oil pump assembly consists of a guide wheel, an impeller, a pump casing, and a filter cover. The pump casing is fixedly connected to the side of the rear end cover facing away from the machine base. The pump casing is supported on the motor shaft assembly through a bearing. The guide wheel and the impeller are fixedly connected to the connecting section of the oil pump assembly in order from small to large distance from the large shaft neck. The center hole of the filter cover is sleeved on the motor shaft assembly. The filter cover is fixedly connected to the pump casing. The filter cover is supported on the motor shaft assembly through a bearing provided in the center hole of the filter cover. The guide wheel and the impeller are inside the pump casing. The heat dissipation oil tank is fixedly connected to the rear end cover. The heat dissipation oil tank completely covers the oil pump assembly. The external oil radiator is fixedly connected to the outside of the heat dissipation oil tank.

[0013] In the rotor liquid-cooled permanent magnet motor described in the present invention, the rotor end cover is provided with six rotor end cover oil inlets and six rotor end cover oil outlets, each of the rotor end cover oil inlets and each of the rotor end cover oil outlets is provided with a positioning hole, each of the rotor end cover oil inlet corresponds to one of the rotor end cover oil outlets and forms a rotor end cover oil channel, each of the rotor end cover oil channels is arc-shaped, and the arc-shaped opening faces the center hole of the rotor end cover. The six rotor end cover oil channels are evenly distributed on a circle centered on the center hole of the rotor end cover, and the direction of the rotor end cover oil channel from the rotor end cover oil inlet to the rotor end cover oil outlet is consistent with the rotation direction of the motor.

[0014] In the rotor liquid-cooled permanent magnet motor described in the present invention, the rotor end seat is provided with six rotor end seat oil inlets and six rotor end seat oil outlets, the oil inlet section is provided with six total oil inlets, and the six total oil inlets are evenly distributed on the cylindrical surface of the oil inlet section, the oil pump assembly connecting section is provided with six total oil outlets, and the six total oil outlets are evenly distributed on the transverse end surface of the oil pump assembly connecting section, and a positioning hole is provided in each of the rotor end seat oil inlet and each of the rotor end seat oil outlet, and the motor shaft assembly is provided with six shaft oil inlet channels and six shaft oil return channels, each of the rotor end seat oil outlet corresponds to one total oil inlet through one shaft oil inlet channel, and each of the rotor end seat oil inlet corresponds to one total oil outlet through the shaft oil return channel.

[0015] In the rotor liquid-cooled permanent magnet motor described in the present invention, there are three bearings, namely, one ball bearing and two roller bearings. One ball bearing and one roller bearing are in contact with the front end cover, and one roller bearing is in contact with the rear end cover. A seal is installed in the bearing outer cover.

[0016] In the rotor liquid-cooled permanent magnet motor described in the present invention, the rotor core is provided with six outer ring axial holes, six middle ring axial holes, and six inner ring axial holes, and each outer ring axial hole and each inner ring axial hole is provided with a positioning tube column.

[0017] In the rotor liquid-cooled permanent magnet motor described in the present invention, the diameter of the large shaft neck is larger than the distance between the proximal end of the outer ring axial hole and the axial center line of the motor shaft assembly, and the filter cover is provided with a plurality of holes. When the motor is working, the hydraulic oil in the heat dissipation oil tank is filtered through the holes of the filter cover and transported to the main oil inlet by the impeller and the guide wheel. The hydraulic oil enters the shaft oil inlet channel, the oil inlet channel of the rotor core, the rotor end cover oil channel and the return oil channel of the rotor core from the main oil inlet, and the hydraulic oil flows from the shaft return oil channel and the main oil outlet to the heat dissipation oil tank.

[0018] Compared with the existing technology, the beneficial effects of the present invention are: the permanent magnet synchronous motor oil cooling system manufactured by adopting this technical solution is simple and low-cost, the rotor dissipates heat evenly, and the motor performance is stable, which meets the market demand for high-performance and high-reliability permanent magnet synchronous motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of the rotor liquid-cooled permanent magnet motor of the present invention;

[0021] Figure 2 This is a schematic diagram of the motor shaft assembly structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the rotor end cover structure of the present invention;

[0023] Figure 4 is a cross-sectional view of the rotor end cover of the present invention;

[0024] Figure 5 This is a left side view of the rotor core of the present invention;

[0025] Figure 6 It is a cross-sectional view of the rotor core of the present invention.

[0026] The corresponding names of the reference numerals in the accompanying drawings are as follows:

[0027] Motor shaft assembly, 2-rotor end cover, 3-outer ring axial hole, 4-permanent magnet, 5-rotor core, 6-inner ring axial hole, 7-stator core with winding, 8-machine base, 9-front cover, 10-rear cover, 11-bearing, 20-seal, 21-bearing outer cover, 30-pump housing, 31-guide wheel, 32-impeller, 33-filter cover, 34-cooling oil tank, 35-external oil radiator, 36-oil filling cap, 81-rear end, 101-shaft extension end, 102-small shaft neck, 103-core shaft seat, 104-rotor end Seat, 105-large journal, 106-oil inlet section, 107-oil pump assembly connecting section, 108-rotor end seat oil outlet, 109-rotor end seat oil inlet, 110-shaft oil inlet channel, 111-total oil inlet, 112-shaft oil return channel, 113-total oil outlet, 200-rotor end cover oil inlet, 201-rotor end cover oil outlet, 202-rotor end cover center hole, 203-rotor end cover oil channel, 331-filter cover center hole, 501-middle ring axial hole, 502-positioning pipe column, 503-rotor core center hole. DETAILED DESCRIPTION

[0028] To further illustrate the technical means and effects of the present invention to achieve the above-mentioned objectives, the following detailed description of the specific embodiments, structures, features and effects of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described in the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0029] like Figures 1 to 6The rotor liquid-cooled permanent magnet motor of the embodiment of the present invention shown in the figure includes an oil pump assembly, a heat dissipation oil tank 34, an external oil radiator 35, a machine base 8, a rotor, a stator, a bearing 11, an end cover, and a bearing outer cover 21; the oil pump assembly is composed of a guide wheel 31, an impeller 32, a pump casing 30, and a filter cover 33; the rotor is composed of a rotor core 5, a permanent magnet 4, a motor shaft assembly 1, and a rotor end cover 2; a rotor core center hole 503, an inner ring axial hole 6, a middle ring axial hole 501, and an outer ring axial hole 3 are provided on the cross section of the rotor core 5; the inner ring axial hole 6 is provided with multiple channels, all of which are oil return channels; the middle ring axial hole 501 is provided with multiple channels, and the number of the middle ring axial holes 501 is the same as the number of the permanent magnets 4; the outer ring axial hole 3 is provided with There are multiple and all of them are oil inlet channels, the permanent magnet 4 is fixedly connected to the axial hole 501 of the middle ring of the rotor core 5, the motor shaft assembly 1 is a bidirectional stepped shaft, and the shaft extension end 101, the small shaft neck 102, the core shaft seat 103, the rotor end seat 104, the large shaft neck 105, the oil inlet section 106, and the oil pump assembly connecting section 107 are provided in sequence from the shaft extension end 101 of the motor shaft assembly 1, the rotor end cover 2 is provided with a rotor end cover oil inlet 200 and a rotor end cover oil outlet 201 on the side facing the rotor core 5, the rotor end cover oil inlet 200 and the rotor end cover oil outlet 201 are communicated in the rotor end cover 2, and the rotor end seat 104 is provided with a rotor end seat oil inlet 109 and a rotor end seat oil outlet 201 on the side facing the rotor core 5. The rotor end seat oil outlet 108, the rotor end seat 104 is provided with a rotor end seat oil inlet channel and a rotor end seat oil return channel, the rotor end seat oil inlet 109 is communicated with the rotor end seat oil return channel, the rotor end seat oil outlet 108 is communicated with the rotor end seat oil inlet channel, the large shaft neck 105 and the oil inlet section 106 are provided with oil inlet channels, the large shaft neck 105, the oil inlet section 106, and the oil pump assembly connecting section 107 are provided with oil return channels, the oil inlet section 106 is provided with a total oil inlet 111, and the oil pump assembly connecting section 107 is provided with a total oil outlet 113, the rotor end seat oil inlet channel, the large shaft neck oil inlet channel, and the oil inlet section oil inlet channel are communicated in sequence to form the shaft oil inlet channel 110, the rotor end seat oil return channel, the large shaft neck oil return channel, the oil inlet section oil return channel, the oil pump assembly The oil return passages of the connecting sections of the components are connected in sequence to form a shaft return passage 112; the motor shaft assembly 1 is inserted into the central hole 503 of the rotor core from the shaft extension end 101, the central hole 503 of the rotor core is matched with the core shaft seat 103, the end of the rotor core 5 facing the rotor end seat 104 is fixedly connected to the rotor end seat 104, the end of the rotor core 5 facing away from the rotor end seat 104 is fixedly connected to the rotor end cover 2, the rotor end cover oil inlet 200 is connected to the oil inlet channel on the rotor core 5, the rotor end cover oil outlet 201 is connected to the oil return channel on the rotor core 5, the rotor end seat oil outlet 108 is connected to the oil inlet channel on the rotor core 5, and the rotor end seat oil inlet 109 is connected to the oil return channel on the rotor core 5;The stator is composed of a stator core 7 with a winding and a machine base 8. The stator core 7 with a winding is composed of a stator winding and a stator core. The stator winding is installed on the stator core, and the stator core is installed in the machine base 8. There are two end covers, one is a front cover 9, and the other is a rear cover 10. The front end of the machine base 8 is fixedly connected to the front cover 9, and the rear end 81 of the machine base 8 is fixedly connected to the rear cover 10. Bearings 11 are provided in the shaft holes of the front cover 9 and the rear cover 10. The two bearings 11 are respectively sleeved on the small shaft neck 102 and the large shaft neck 105. A bearing outer cover 21 is provided on the side of each end cover facing away from the machine base 8; the pump housing 30 and the rear cover 10 face away from the machine base 8, the pump housing 30 is fixedly connected to the motor shaft assembly 1 via bearings. The guide wheel 31 and impeller 32 are fixedly connected to the oil pump assembly connection section 107 in ascending order of distance from the main journal 105. The filter cover center hole 331 is inserted into the motor shaft assembly 1. The filter cover 33 is fixedly connected to the pump housing 30 and supported on the motor shaft assembly 1 via bearings provided in the filter cover center hole 331. The guide wheel 31 and impeller 32 are located within the pump housing 30. The heat sink 34 is fixedly connected to the rear end cover 10, completely covering the oil pump assembly. The external oil radiator 35 is fixedly connected to the outside of the heat sink 34.

[0030] like Figures 3 and 4 As shown, in this embodiment, the rotor end cover 2 is provided with six rotor end cover oil inlets 200 and six rotor end cover oil outlets 201, each rotor end cover oil inlet 200 and each rotor end cover oil outlet 201 is provided with a positioning hole, each rotor end cover oil inlet 200 corresponds to a rotor end cover oil outlet 201 and forms a rotor end cover oil passage 203, each rotor end cover oil passage 203 is arc-shaped, and the arc opening faces the rotor end cover center hole 202, and the six rotor end cover oil passages 203 are evenly distributed on the circumference of the rotor end cover center hole as the center, and the direction of the rotor end cover oil passage 203 from the rotor end cover oil inlet to the rotor end cover oil outlet is consistent with the direction of rotation of the motor.

[0031] like Figures 1 to 2 As shown, in this embodiment, the rotor end seat 104 is provided with six rotor end seat oil inlets 109 and six rotor end seat oil outlets 108, the oil inlet section 106 is provided with six total oil inlets 111, and the six total oil inlets 111 are evenly distributed on the cylindrical surface of the oil inlet section 106, the oil pump assembly connecting section 107 is provided with six total oil outlets 113, and the six total oil outlets 113 are evenly distributed on the transverse end surface of the oil pump assembly connecting section 107, and a positioning hole is provided in each rotor end seat oil inlet 109 and each rotor end seat oil outlet 108, and the motor shaft assembly 1 is provided with six shaft oil inlet channels 110 and six shaft oil return channels 112, each rotor end seat oil outlet 108 corresponds to a total oil inlet 111 through a shaft oil inlet channel 110, and each rotor end seat oil inlet 109 corresponds to a total oil outlet 113 through a shaft oil return channel 112.

[0032] like Figure 1 As shown, in this embodiment, there are three bearings 11, namely a ball bearing and two roller bearings. One ball bearing and one roller bearing are in contact with the front end cover 9, and one roller bearing is in contact with the rear end cover 10. A seal 20 is installed in the bearing outer cover 21.

[0033] like Figures 5 and 6 As shown, in this embodiment, the rotor core 5 is provided with six outer ring axial holes 3, six middle ring axial holes 501, and six inner ring axial holes 6, and each outer ring axial hole 3 and each inner ring axial hole 6 is provided with a positioning column 502.

[0034] like Figures 1 to 6 As shown, in this embodiment, the diameter of the large journal 105 is larger than the distance between the proximal end of the outer ring axial hole 3 and the axial center line of the motor shaft assembly 1, and a plurality of holes are provided on the filter cover 33. When the motor is working, the hydraulic oil in the heat dissipation oil tank 34 is filtered through the holes of the filter cover 33 and then transported to the main oil inlet 111 by the impeller 32 and the guide wheel 31. The hydraulic oil enters the shaft oil inlet channel 110, the oil inlet channel of the rotor core 5, the rotor end cover oil channel 203 and the return oil channel of the rotor core 5 from the main oil inlet 111, and the hydraulic oil flows from the shaft return oil channel 112 and the main oil outlet 113 to the heat dissipation oil tank 34.

[0035] The above-mentioned Figures 1 to 6 The embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent or similar changes made based on the principles, shapes, and structures of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotor liquid-cooled permanent magnet motor, characterized in that: Including oil pump assembly, cooling oil tank, external oil radiator, engine base, rotor, stator, bearing, end cover, bearing outer cover; The rotor is composed of a rotor core, permanent magnets, a motor shaft assembly, and a rotor end cover. The cross section of the rotor core is provided with a rotor core center hole, an inner ring axial hole, a middle ring axial hole, and an outer ring axial hole. The inner ring axial holes are provided with multiple channels, all of which are oil return channels. The middle ring axial holes are provided with multiple channels, and the number of the middle ring axial holes is the same as the number of the permanent magnets. The outer ring axial holes are provided with multiple channels, all of which are oil inlet channels. The permanent magnets are fixedly connected to the middle ring axial holes of the rotor core. The motor shaft assembly is a bidirectional stepped shaft, and is provided with a shaft extension end, a small shaft neck, an iron core shaft seat, a rotor end seat, a large shaft neck, an oil inlet section, and an oil pump assembly connection section in sequence from the shaft extension end of the motor shaft assembly. The rotor end seat is provided with a rotor end seat oil inlet and a rotor end seat oil outlet on the side facing the rotor iron core. The rotor end seat is provided with a rotor end seat oil inlet channel and a rotor end seat oil return channel. The rotor end seat oil inlet is communicated with the rotor end seat oil return channel, and the rotor end seat oil outlet is communicated with the rotor The end seat oil inlet passages are connected, the large shaft neck and the oil inlet section are all provided with oil inlet passages, the large shaft neck, the oil inlet section, and the oil pump assembly connecting section are all provided with oil return passages, the oil inlet section is provided with a total oil inlet, and the oil pump assembly connecting section is provided with a total oil outlet. The rotor end seat oil inlet passage, the large shaft neck oil inlet passage, and the oil inlet section oil inlet passage are sequentially connected to form a shaft oil inlet passage, and the rotor end seat oil return passage, the large shaft neck oil return passage, the oil inlet section oil return passage, and the oil pump assembly connecting section oil return passage are sequentially connected to form a shaft oil return passage. A rotor end cover oil inlet and a rotor end cover oil outlet are provided on a side of the rotor end cover facing the rotor core, and the rotor end cover oil inlet and the rotor end cover oil outlet are communicated with each other inside the rotor end cover; The motor shaft assembly is inserted into the center hole of the rotor core from the shaft extension end, the center hole of the rotor core is matched with the core shaft seat, the end of the rotor core facing the rotor end seat is fixedly connected to the rotor end seat, the end of the rotor core facing away from the rotor end seat is fixedly connected to the rotor end cover, the oil inlet of the rotor end cover is communicated with the oil inlet channel on the rotor core, the oil outlet of the rotor end cover is communicated with the oil return channel on the rotor core, the oil outlet of the rotor end seat is communicated with the oil inlet channel on the rotor core, and the oil inlet of the rotor end seat is communicated with the oil return channel on the rotor core; The stator is composed of a stator core with windings and a machine base. The stator core with windings is composed of a stator winding and a stator core. The stator winding is installed on the stator core, and the stator core is installed in the machine base. There are two end covers, one is a front end cover, and the other is a rear end cover. The front end of the machine base is fixedly connected to the front end cover, and the rear end of the machine base is fixedly connected to the rear end cover. The shaft holes of the front end cover and the rear end cover are both provided with the bearings, and the bearings are respectively sleeved on the small shaft neck and the large shaft neck. The bearing outer cover is installed on the side of each end cover facing away from the machine base; The oil pump assembly consists of a guide wheel, an impeller, a pump casing, and a filter cover. The pump casing is fixedly connected to the side of the rear end cover facing away from the machine base. The pump casing is supported on the motor shaft assembly through a bearing. The guide wheel and the impeller are fixedly connected to the connecting section of the oil pump assembly in order from small to large distance from the large shaft neck. The center hole of the filter cover is sleeved on the motor shaft assembly. The filter cover is fixedly connected to the pump casing. The filter cover is supported on the motor shaft assembly through a bearing provided in the center hole of the filter cover. The guide wheel and the impeller are inside the pump casing. The heat dissipation oil tank is fixedly connected to the rear end cover. The heat dissipation oil tank completely covers the oil pump assembly. The external oil radiator is fixedly connected to the outside of the heat dissipation oil tank.

2. The rotor liquid-cooled permanent magnet motor according to claim 1, characterized in that: The rotor end cover is provided with six rotor end cover oil inlets and six rotor end cover oil outlets, each of the rotor end cover oil inlets and each of the rotor end cover oil outlets is provided with a positioning hole, each of the rotor end cover oil inlet corresponds to one of the rotor end cover oil outlets and forms a rotor end cover oil channel, each of the rotor end cover oil channels is arc-shaped, and the arc-shaped opening faces the center hole of the rotor end cover. The six rotor end cover oil channels are evenly distributed on a circle centered on the center hole of the rotor end cover, and the direction of the rotor end cover oil channel from the rotor end cover oil inlet to the rotor end cover oil outlet is consistent with the rotation direction of the motor.

3. The rotor liquid-cooled permanent magnet motor according to claim 1, characterized in that: The rotor end seat is provided with six rotor end seat oil inlets and six rotor end seat oil outlets, the oil inlet section is provided with six total oil inlets, and the six total oil inlets are evenly distributed on the cylindrical surface of the oil inlet section, the oil pump assembly connecting section is provided with six total oil outlets, and the six total oil outlets are evenly distributed on the transverse end surface of the oil pump assembly connecting section, each of the rotor end seat oil inlet and each of the rotor end seat oil outlet is provided with a positioning hole, the motor shaft assembly is provided with six shaft oil inlet channels and six shaft oil return channels, each of the rotor end seat oil outlet corresponds to one total oil inlet through one shaft oil inlet channel, and each of the rotor end seat oil inlet corresponds to one total oil outlet through the shaft oil return channel.

4. The rotor liquid-cooled permanent magnet motor according to claim 1, characterized in that: There are three bearings, namely one ball bearing and two roller bearings. One ball bearing and one roller bearing are in contact with the front end cover, and one roller bearing is in contact with the rear end cover. A seal is installed in the bearing outer cover.

5. The rotor liquid-cooled permanent magnet motor according to claim 1, characterized in that: The rotor core is provided with six outer ring axial holes, six middle ring axial holes, and six inner ring axial holes. Each outer ring axial hole and each inner ring axial hole is provided with a positioning column.

6. The rotor liquid-cooled permanent magnet motor according to claim 1, characterized in that: The diameter of the large journal is larger than the distance between the proximal end of the outer ring axial hole and the axial center line of the motor shaft assembly. The filter cover is provided with a plurality of holes. When the motor is working, the hydraulic oil in the heat dissipation oil tank is filtered through the holes of the filter cover and transported to the main oil inlet by the impeller and the guide wheel. The hydraulic oil enters the shaft oil inlet channel, the oil inlet channel of the rotor core, the rotor end cover oil channel and the return oil channel of the rotor core from the main oil inlet. The hydraulic oil flows from the shaft return oil channel and the main oil outlet to the heat dissipation oil tank.

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