Oil-cooled motor

Abstract

The invention discloses an oil-cooled motor, comprising a motor housing, a stator core, a stator winding, a rotor assembly and a rotating shaft; a rotor assembly is arranged on the rotating shaft; a stator core is arranged outside the rotor assembly; a motor housing is arranged outside the stator core; an end cover is arranged at least at one end of the motor housing; a stator winding is arranged on the stator core; a cooling liquid cavity I and a cooling liquid cavity II are arranged at two ends of the stator winding respectively; the cooling liquid cavity I and the cooling liquid cavity II are connected; an insulating housing is arranged in the winding groove inside the stator core; the two ends of the insulating housing are connected to the cooling liquid cavity I and the cooling liquid cavity II respectively; the motor housing is provided with a circulation hole I connected to the cooling liquid cavity I; the motor housing is provided with a circulation hole II connected to the cooling liquid cavity II. The invention directly cools the stator winding of the motor, has high cooling strength, and improves the rated power of the motor; isolates the rotor from the coolant to improve the working efficiency of the motor; ensures the cleanliness of the coolant and prolongs the service life of the motor.

Description

Technical Field

[0001] The invention relates to a motor, in particular to a high-efficiency oil-cooled motor which directly cools the stator winding of the motor. Background Art

[0002] Improving the cooling structure of the motor is a major task in the development process of the motor. The stronger the heat dissipation capacity of the motor, the greater the power density of the motor will be. Various motor cooling schemes have been produced for this purpose, from air cooling, water cooling to oil cooling, each with its own advantages and disadvantages: the advantages of air-cooled motors are low friction loss, high efficiency and low cost, but the disadvantages are low cooling intensity and low power density of the motor; the cooling water channel of the water-cooled motor is set on the shell, and the heat conduction path from the stator winding to the cooling water is long, the heat dissipation is slow, and the cooling effect is not good; the advantage of the oil-cooled motor is that the stator winding can be directly cooled. There are mainly two structures: oil-immersed and spray-type. The former has large losses and low motor efficiency due to the friction between the rotor and the cooling oil when rotating, while the latter has low cooling intensity and limited improvement in cooling effect.

[0003] By analyzing the heat generation and heat conduction mechanism during the operation of the motor, it is found that under load conditions, the stator winding of the motor is the main source of heat. Part of the heat generated is dissipated through the end of the stator winding, part is transferred to the rotor through the air gap between the rotor and the stator and dissipated through the end of the rotor, and the other part is transferred to the stator core through conduction, etc. Therefore, cooling the stator winding is the most important link in the heat dissipation of the motor. Summary of the invention

[0004] The purpose of the present invention is to provide an oil-cooled motor that directly cools the stator winding of the motor, while eliminating the problem of heat generated by friction between the rotor and the oil, and operating efficiently and having a long service life.

[0005] The technical solution of the present invention is: an oil-cooled motor, comprising a motor housing, a stator core, a stator winding, a rotor assembly and a rotating shaft; a rotor assembly is arranged on the rotating shaft; a stator core is arranged outside the rotor assembly; a motor housing is arranged outside the stator core; at least one of the two ends of the motor housing is provided with an end cover; a stator winding is arranged on the stator core; a cooling liquid cavity I and a cooling liquid cavity II are respectively arranged at the two ends of the stator winding; the cooling liquid cavity I is communicated with the cooling liquid cavity II; the cooling liquid cavity I and the cooling liquid cavity II are built-in with coolant; an insulating housing is arranged in the winding groove inside the stator core; the two ends of the insulating housing are respectively connected to the cooling liquid cavity I and the cooling liquid cavity II; a circulation hole I is communicated with the cooling liquid cavity I and is connected to an external cooling pipeline; a circulation hole II is communicated with the cooling liquid cavity II and is connected to an external cooling pipeline.

[0006] Preferably, the two ends of the insulating shell are respectively connected and communicated with the cooling liquid cavity I and the cooling liquid cavity II; the cooling liquid cavity I, the insulating shell, the cooling liquid cavity II, the circulation hole I and the circulation hole II constitute a cooling circuit.

[0007] Preferably, a connecting pipeline is provided between the cooling liquid chamber I and the cooling liquid chamber II; the cooling liquid chamber I, the connecting pipeline, the cooling liquid chamber II, the circulation hole I and the circulation hole II constitute a cooling circuit; the connecting pipeline is arranged inside or outside the motor housing.

[0008] Preferably, the two ends of the insulating shell are respectively connected and communicated with the cooling liquid chamber I and the cooling liquid chamber II; a connecting pipeline is arranged between the cooling liquid chamber I and the cooling liquid chamber II; the cooling liquid chamber I, the insulating shell, the connecting pipeline, the cooling liquid chamber II, the circulation hole I and the circulation hole II constitute a cooling circuit; the connecting pipeline is arranged inside or outside the motor housing.

[0009] Preferably, sealing rings are provided at the connection points between the two ends of the stator core and the cooling liquid chamber I and the cooling liquid chamber II; and an oil sealing ring is provided at the connection point between the end of the insulating shell and the end cover.

[0010] Preferably, the coolant is a coolant with insulating ability.

[0011] An oil-cooled motor comprises a motor housing, a stator core, a stator winding, a rotor assembly and a rotating shaft; the rotating shaft is provided with a rotor assembly; the stator core is provided outside the rotor assembly; the motor housing is provided outside the stator core; at least one of the two ends of the motor housing is provided with an end cover; the stator core is provided with a stator winding; the two ends of the stator winding are provided with a cooling liquid cavity I and a cooling liquid cavity II respectively; the cooling liquid cavity I and the cooling liquid cavity II are filled with cooling liquid; an insulating housing is provided in the winding groove inside the stator core; the two ends of the insulating housing are connected to the cooling liquid cavity I and the cooling liquid cavity II respectively; two circulation holes I are communicated with the cooling liquid cavity I and are connected to an external cooling pipeline; two circulation holes II are communicated with the cooling liquid cavity II and are connected to an external cooling pipeline; the cooling liquid cavity I and the two circulation holes I constitute a cooling circuit; the cooling liquid cavity II and the circulation holes II constitute a cooling circuit.

[0012] Preferably, two ends of the insulating shell are respectively connected and communicated with the cooling liquid chamber I and the cooling liquid chamber II.

[0013] Preferably, a connecting pipeline is provided between the cooling liquid chamber I and the cooling liquid chamber II; the connecting pipeline is arranged inside or outside the motor housing.

[0014] Preferably, the two ends of the insulating shell are respectively connected and communicated with the cooling liquid chamber I and the cooling liquid chamber II; a connecting pipeline is arranged between the cooling liquid chamber I and the cooling liquid chamber II; the connecting pipeline is arranged inside or outside the motor housing.

[0015] Preferably, sealing rings are provided at the connection points between the two ends of the stator core and the cooling liquid chamber I and the cooling liquid chamber II; and an oil sealing ring is provided at the connection point between the end of the insulating shell and the end cover.

[0016] Preferably, the coolant is a coolant with insulating ability.

[0017] The advantages of the present invention are:

[0018] 1. Directly cool the stator winding of the motor, with high cooling intensity, which can greatly increase the rated power of the motor and improve the utilization rate of motor materials;

[0019] 2. Since the rotor and coolant are effectively isolated, friction between the rotor and coolant is avoided, loss is reduced, and the working efficiency of the motor is improved;

[0020] 3. Since the coolant does not contact the rotating parts, the cleanliness of the coolant is guaranteed, avoiding metal particles entering the coolant and causing abnormal motor wear, thereby increasing the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic cross-sectional view of an oil-cooled motor in the first embodiment of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0025] Figure 4 This is a schematic cross-sectional view of an oil-cooled motor in the second embodiment of the present invention;

[0026] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0027] Figure 6 for Figure 4 Enlarged view of point D in the middle;

[0028] Figure 7 This is a schematic cross-sectional view of an oil-cooled motor in the second embodiment of the present invention;

[0029] Figure 8 for Figure 7 Enlarged view of point E in the middle;

[0030] Among them: 1. Motor housing; 2. Stator core; 3. Stator winding; 4. Rotor assembly; 5. Rotating shaft; 6. Cooling liquid chamber I; 7. Cooling liquid chamber II; 8. Insulating housing; 9. Sealing ring; 10. Oil sealing ring; 11. End cover; 12. Circulation hole I; 13. Circulation hole II; 31. Gap between wires; 32. Connecting pipeline; 33. Wire insulator. DETAILED DESCRIPTION

[0031] Embodiment 1:

[0032] like Figure 1-3 As shown; an oil-cooled motor comprises a motor housing 1, a stator core 2, a stator winding 3, a rotor assembly 4 and a rotating shaft 5; the rotating shaft 5 is provided with a rotor assembly 4; the stator core 2 is provided outside the rotor assembly 4; the motor housing 1 is provided outside the stator core 2; at least one end of the motor housing 1 is provided with an end cover 11; the stator core 2 is provided with a stator winding 3; the two ends of the stator winding 3 are respectively provided with a cooling liquid cavity Ⅰ6 and a cooling liquid cavity Ⅱ7; the two ends of the stator winding 3 are respectively in the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7; the two ends of the stator core 2 are respectively provided with sealing rings 9 at the connection between the two ends of the stator core 2 and the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7; the two ends of the insulating housing 8 An oil sealing ring 10 is provided at the connection between the end and the end cover 11; the cooling liquid chamber I6 and the cooling liquid chamber II7 are cavities composed of the motor housing 1, the two end surfaces of the stator core 2, the two end surfaces of the stator winding 3, the sealing ring 9, the oil sealing ring 10 and the end cover 11; the cooling liquid chamber I6 and the cooling liquid chamber II7 are built-in with coolant; the coolant is a coolant with insulating ability; an insulating shell 8 is provided between the winding slots inside the stator core 2 and the stator winding 3; the two ends of the insulating shell 8 are respectively connected to the cooling liquid chamber I6 and the cooling liquid chamber II7; the circulation hole I12 is connected to the cooling liquid chamber I6 and is connected to the external cooling pipeline; the circulation hole II13 is connected to the cooling liquid chamber II7 and is connected to the external cooling pipeline.

[0033] The two ends of the insulating shell 8 are connected and communicated with the cooling liquid cavity I6 and the cooling liquid cavity II7 respectively; the cooling liquid cavity I6, the insulating shell 8, the cooling liquid cavity II7, the circulation hole I12 and the circulation hole II13 constitute a cooling circuit; the cooling liquid in the insulating shell 8 communicates with the cooling liquid cavity I6 and the cooling liquid cavity II7 through the inter-wire gap 31 between the wires of the stator winding 3, and the circulation hole I12 inputs the cooling liquid that has passed through the cooling circulation device into the cooling liquid cavity I6, passes through the insulating shell 8 and the cooling liquid cavity II7, cools the stator winding 3, and then sends the cooling liquid out from the circulation hole II13, so that the circulation plays a cooling role; the insulating shell 8 has two main functions: one is electrical isolation protection, that is, The insulation between the stator winding 3 and the stator core 2 prevents leakage, and the coolant is isolated, that is, the coolant is prevented from entering the stator core 2. Because the stator core 2 is composed of multiple silicon steel sheets, the coolant cannot be sealed between the silicon steel sheets, so the coolant is isolated by the insulating shell 8 to prevent it from entering the stator core 2; due to the provision of the sealing ring 9 and the oil sealing ring 10, the coolant only cools the stator winding 3, and the stator winding 3 is immersed in the circulating coolant, so that it is fully cooled, effectively ensuring the working efficiency of the motor; the rotor assembly 4 is effectively isolated from the coolant, reducing the loss, and at the same time the cleanliness of the coolant is guaranteed, avoiding the abnormal wear caused by metal particles entering the coolant.

[0034] Embodiment 2:

[0035] like Figure 4-6As shown; an oil-cooled motor, comprising a motor housing 1, a stator core 2, a stator winding 3, a rotor assembly 4 and a rotating shaft 5; the rotating shaft 5 is provided with a rotor assembly 4; the stator core 2 is provided outside the rotor assembly 4; the motor housing 1 is provided outside the stator core 2; both ends of the motor housing 1 are provided with end covers 11; the stator core 2 is provided with a stator winding 3; the two ends of the stator winding 3 are respectively provided with a cooling liquid cavity Ⅰ6 and a cooling liquid cavity Ⅱ7; the two ends of the stator winding 3 are respectively in the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7; the two ends of the stator winding 3 are respectively in the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7; the connection between the two ends of the stator core 2 and the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7 is provided with a sealing ring 9; the connection between the two ends of the insulating housing 8 and the end cover 11 is provided with an oil sealing ring 10; the cooling liquid Cavity I6 and cooling liquid cavity II7 are cavities composed of motor housing 1, two end surfaces of stator core 2, two end surfaces of stator winding 3, sealing ring 9, oil sealing ring 10 and end cover 11; the cooling liquid cavity I6 and cooling liquid cavity II7 are built with cooling liquid; the cooling liquid is a cooling liquid with insulating ability; an insulating shell 8 is arranged between the winding slots inside the stator core 2 and the stator winding 3; the two ends of the insulating shell 8 are respectively connected to the cooling liquid cavity I6 and the cooling liquid cavity II7; the circulation hole I12 is connected to the cooling liquid cavity I6 and is connected to the external cooling pipeline; the circulation hole II13 is connected to the cooling liquid cavity II7 and is connected to the external cooling pipeline; a connecting pipeline 32 is arranged between the cooling liquid cavity I and the cooling liquid cavity II; the connecting pipeline 32 is arranged in the motor housing 1.

[0036] The coolant is connected to the cooling liquid chamber I6 and the cooling liquid chamber II7 in the connecting pipe 32, so that the coolant forms a cooling circuit in the cooling liquid chamber I6, the connecting pipe 32, the cooling liquid chamber II7, the circulation hole I and the circulation hole II; the stator winding wire is provided with a wire insulator 33; the circulation hole I12 inputs the coolant passing through the cooling circulation device into the cooling liquid chamber I6, passes through the connecting pipe 32 and the cooling liquid chamber II7, cools the stator winding 3, and then sends the coolant out from the circulation hole II13, so that the circulation plays a cooling role; the insulating shell 8 has two main functions: one is electrical isolation protection, that is, insulation between the stator winding 3 and the stator core 2 The first is to prevent leakage, and the second is to isolate the coolant, that is, to prevent the coolant from entering the stator core 2. Because the stator core 2 is composed of multiple silicon steel sheets, the coolant cannot be sealed between the silicon steel sheets, so the coolant is isolated by the insulating shell 8 to prevent it from entering the stator core 2; due to the provision of sealing rings 9 and oil sealing rings 10, the coolant only cools the stator winding 3, and the stator winding 3 is immersed in the circulating coolant, so that it is fully cooled, effectively ensuring the working efficiency of the motor; effectively isolate the rotor assembly 4 from the coolant, reduce losses, and at the same time, the cleanliness of the coolant is guaranteed, avoiding the abnormal wear caused by metal particles entering the coolant. The connecting pipeline 32 in this embodiment can also be set outside the motor casing, and the function it plays is the same as that of this embodiment.

[0037] Embodiment three:

[0038] like Figure 7-8 As shown; an oil-cooled motor comprises a motor housing 1, a stator core 2, a stator winding 3, a rotor assembly 4 and a rotating shaft 5; the rotating shaft 5 is provided with a rotor assembly 4; the stator core 2 is provided outside the rotor assembly 4; the motor housing 1 is provided outside the stator core 2; both ends of the motor housing 1 are provided with end covers 11; the stator core 2 is provided with a stator winding 3; the two ends of the stator winding 3 are respectively provided with a cooling liquid cavity Ⅰ6 and a cooling liquid cavity Ⅱ7; the two ends of the stator winding 3 are respectively in the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7; the two ends of the stator winding 3 are respectively in the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7; the connection between the two ends of the stator core 2 and the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7 is provided with a sealing ring 9; the connection between the two ends of the insulating housing 8 and the end cover 11 is provided with an oil sealing ring 10; the cooling liquid cavity Ⅰ6 and cooling liquid cavity Ⅱ7 are cavities composed of motor housing 1, two end surfaces of stator core 2, two end surfaces of stator winding 3, sealing ring 9, oil sealing ring 10 and end cover 11; the cooling liquid cavity Ⅰ6 and cooling liquid cavity Ⅱ7 are built with cooling liquid; the cooling liquid is a cooling liquid with insulating ability; an insulating shell 8 is arranged between the winding slots inside the stator core 2 and the stator winding 3; the two ends of the insulating shell 8 are connected to the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7 respectively; two circulation holes Ⅰ12 are connected to the cooling liquid cavity Ⅰ6 and connected to the external cooling pipeline; two circulation holes Ⅱ are connected to the cooling liquid cavity Ⅱ7 and connected to the external cooling pipeline; the cooling liquid cavity Ⅰ6 and the two circulation holes Ⅰ12 constitute a cooling circuit; the cooling liquid cavity Ⅱ7 and the circulation hole Ⅱ13 constitute a cooling circuit.

[0039] The two circulation holes Ⅰ12 of the cooling liquid and the cooling liquid cavity Ⅰ6 perform cooling circulation; the two circulation holes Ⅱ13 and the cooling liquid cavity Ⅱ7 perform independent cooling circulation; the two circulation holes Ⅰ12 and the two circulation holes Ⅱ13 are respectively connected to cooling circulation pipelines; the cooling liquid passing through the cooling circulation device is input into the cooling liquid cavity Ⅰ6 from one circulation hole Ⅰ12 to cool the stator winding 3, and then the cooling liquid is sent out from another circulation hole Ⅰ12, so that the circulation has a cooling effect; the cooling liquid passing through the cooling circulation device is input into the cooling liquid cavity Ⅱ7 from one circulation hole Ⅱ13 to cool the stator winding 3, and then the cooling liquid is sent out from another circulation hole Ⅱ13, so that the circulation has a cooling effect; the cooling liquid cavity Ⅰ6 and the cooling liquid cavity Ⅱ7 circulate to cool the stator winding 3; The insulating shell 8 has two main functions: one is electrical isolation protection, that is, insulation between the stator winding 3 and the stator core 2 to prevent leakage, and the other is coolant isolation, that is, preventing the coolant from entering the stator core 2. Because the stator core 2 is composed of multiple silicon steel sheets, the coolant cannot be sealed between the silicon steel sheets, so the coolant is isolated by the insulating shell 8 to prevent it from entering the stator core 2; due to the provision of the sealing ring 9 and the oil sealing ring 10, the coolant only cools the stator winding 3, and the stator winding 3 is immersed in the circulating coolant, so that it is fully cooled, effectively ensuring the working efficiency of the motor; the rotor assembly 4 is effectively isolated from the coolant, reducing losses, and at the same time the cleanliness of the coolant is guaranteed, avoiding the abnormal wear caused by metal particles entering the coolant.

[0040] The three embodiments of the present invention can be used alone, or two or three of them can be combined and used in combination, and the selection is made according to specific actual needs.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An oil-cooled motor, characterized in that: It includes a motor housing, a stator core, a stator winding, a rotor assembly and a rotating shaft; the rotating shaft is provided with a rotor assembly; the stator core is provided outside the rotor assembly; the motor housing is provided outside the stator core; at least one end of the motor housing is provided with an end cover; the stator core is provided with a stator winding; the two ends of the stator winding are respectively provided with a cooling liquid cavity I and a cooling liquid cavity II; the cooling liquid cavity I and the cooling liquid cavity II are connected; the cooling liquid cavity I and the cooling liquid cavity II are built with cooling liquid; An insulating shell is arranged in the winding slot inside the stator core; the two ends of the insulating shell are respectively connected to the cooling liquid cavity I and the cooling liquid cavity II; the circulation hole I is communicated with the cooling liquid cavity I and is connected to the external cooling pipeline; The circulation hole II is communicated with the cooling liquid cavity II and is connected with an external cooling pipeline; The coolant is connected to the coolant chamber I and the coolant chamber II through the inter-wire gaps between the conductors of the stator winding inside the insulating housing. The circulation hole I inputs the coolant that has passed through the cooling circulation device into the coolant chamber I, passes through the insulating housing and the coolant chamber II, cools the stator winding, and then sends the coolant out from the circulation hole II, so that the stator winding is immersed in the circulating coolant. The two ends of the insulating shell are respectively connected and communicated with the cooling liquid cavity I and the cooling liquid cavity II; a connecting pipeline is arranged between the cooling liquid cavity I and the cooling liquid cavity II; the cooling liquid cavity I, the insulating shell, the connecting pipeline, the cooling liquid cavity II, the circulation hole I and the circulation hole II constitute a cooling circuit; the connecting pipeline is arranged inside or outside the motor housing.

2. The oil-cooled motor according to claim 1, characterized in that: The two ends of the insulating shell are respectively connected and communicated with the cooling liquid cavity I and the cooling liquid cavity II; the cooling liquid cavity I, the insulating shell, the cooling liquid cavity II, the circulation hole I and the circulation hole II constitute a cooling circuit.

3. The oil-cooled motor according to claim 1, characterized in that: A connecting pipeline is arranged between the cooling liquid cavity I and the cooling liquid cavity II; the cooling liquid cavity I, the connecting pipeline, the cooling liquid cavity II, the circulation hole I and the circulation hole II constitute a cooling circuit; the connecting pipeline is arranged inside or outside the motor housing.

4. An oil-cooled motor according to any one of claims 1 to 3, characterized in that: Sealing rings are arranged at the joints between the two ends of the stator core and the cooling liquid chamber I and the cooling liquid chamber II; and an oil sealing ring is arranged at the joint between the end of the insulating shell and the end cover.

5. An oil-cooled motor, characterized in that: It includes a motor housing, a stator core, a stator winding, a rotor assembly and a rotating shaft; the rotating shaft is provided with a rotor assembly; the stator core is provided outside the rotor assembly; the motor housing is provided outside the stator core; at least one end of the motor housing is provided with an end cover; the stator core is provided with a stator winding; the two ends of the stator winding are respectively provided with a cooling liquid cavity I and a cooling liquid cavity II; the cooling liquid cavity I and the cooling liquid cavity II are built-in with coolant; an insulating housing is provided in the winding groove inside the stator core; the two ends of the insulating housing are respectively connected to the cooling liquid cavity I and the cooling liquid cavity II; two circulation holes I are connected to the cooling liquid cavity I and are connected to the external cooling pipeline; The two circulation holes II are communicated with the cooling liquid cavity II and connected to the external cooling pipeline; the cooling liquid cavity I and the two circulation holes I constitute a cooling circuit; the cooling liquid cavity II and the circulation holes II constitute a cooling circuit; The coolant is connected to the coolant chamber I and the coolant chamber II through the inter-wire gaps between the conductors of the stator winding inside the insulating housing. The circulation hole I inputs the coolant that has passed through the cooling circulation device into the coolant chamber I, passes through the insulating housing and the coolant chamber II, cools the stator winding, and then sends the coolant out from the circulation hole II, so that the stator winding is immersed in the circulating coolant. The two ends of the insulating shell are respectively connected and communicated with the cooling liquid cavity I and the cooling liquid cavity II; a connecting pipeline is arranged between the cooling liquid cavity I and the cooling liquid cavity II; the connecting pipeline is arranged inside or outside the motor housing.

6. The oil-cooled motor according to claim 5, characterized in that: The two ends of the insulating shell are respectively connected and communicated with the cooling liquid cavity I and the cooling liquid cavity II.

7. The oil-cooled motor according to claim 5, characterized in that: A connecting pipeline is provided between the cooling liquid chamber I and the cooling liquid chamber II; the connecting pipeline is arranged inside or outside the motor housing.

8. An oil-cooled motor according to any one of claims 5 to 7, characterized in that: Sealing rings are arranged at the joints between the two ends of the stator core and the cooling liquid chamber I and the cooling liquid chamber II; and an oil sealing ring is arranged at the joint between the end of the insulating shell and the end cover.

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