Direct cooling oil cooling motor

Abstract

The utility model discloses a direct cooling oil cooling motor, which belongs to the technical field of motor cooling and comprises a base, a stator, two end covers, a rotor and a sealing element, the rotor is arranged in an inner cavity of the motor, and the stator is arranged in an outer cavity of the motor. The stator comprises a stator iron core and a plurality of windings, stator yoke oil passing holes penetrate through the portions, opposite to the windings, of the yoke portion of the stator iron core, stator tooth oil passing holes penetrate through the tooth portions of the stator iron core, and at least one stator groove oil passing hole penetrating through the windings is formed in a stator groove of the stator iron core. Cooling oil is in direct or indirect contact with a heat source (winding) through a plurality of oil passing holes distributed in the yoke part, the tooth part and the groove part on the stator iron core, so that the thermal resistance between the heat source and a cooling medium is remarkably reduced, the heat transfer efficiency is improved, the heat of the winding and the stator iron core can be taken away more quickly, and the temperature rise of the motor is effectively controlled.

Description

Technical Field

[0001] This utility model belongs to the field of motor cooling technology, specifically a direct-cooling oil-cooled motor. Background Technology

[0002] With the continuous development of industrial technology and the increasing demands of applications, the power density and torque density of motors are constantly increasing, which places higher demands on their heat dissipation performance. During the operation of high-power-density motors, a large amount of heat is generated inside the motor due to losses. If this heat cannot be dissipated in time, it will lead to excessive temperature rise in the motor, seriously affecting its efficiency, service life, and reliability.

[0003] Traditional motor cooling technology primarily relies on air cooling, which uses an external fan to force airflow and dissipate heat to the external environment. This method is simple in structure and low in cost, but its cooling efficiency is limited, especially for high-power-density motors. Water cooling technology uses circulating water to remove heat, offering higher heat transfer efficiency. However, water cooling systems are limited by the indirect contact between the cooling medium and some motor components (such as windings and the core), resulting in less than optimal heat dissipation.

[0004] In recent years, oil cooling technology has been increasingly applied to high-performance motors. Compared to air and water cooling, oil cooling, through the superior insulation properties and high heat capacity of its cooling medium, can more directly cool the motor's main heat sources, such as windings, core, and bearings. The cooling oil rapidly carries away heat by directly contacting or flowing near the heat source, significantly improving cooling efficiency and making it suitable for high-voltage and high-temperature operating environments. Currently, the flow channels in motor stators are mostly arranged around the stator core, rather than ensuring sufficient contact between the cooling oil and the windings, thus requiring further improvement in heat dissipation efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a direct-cooling oil-cooled motor to solve the problems mentioned in the prior art.

[0006] A direct-cooled oil-cooled motor is provided, comprising:

[0007] The machine base, stator, two end caps, rotor, and seals are provided. The two end caps are respectively disposed at both ends of the machine base. The seals divide the internal space formed by the machine base and the two end caps into an inner cavity and an outer cavity. The rotor is disposed in the inner cavity and the stator is disposed in the outer cavity. The two ends of the machine base are respectively provided with an oil inlet and an oil outlet communicating with the outer cavity.

[0008] The stator includes a stator core and several windings. The windings are arranged in stator slots in the circumferential direction of the stator core. The yoke of the stator core and the part opposite to the windings are provided with stator yoke oil passage holes. The teeth of the stator core are provided with stator tooth oil passage holes. At least one stator slot oil passage hole is provided in the stator slot of the stator core, which penetrates the windings.

[0009] Furthermore, the stator slot oil passage is formed in the middle region of the winding. Since the middle region of the winding is the main area for heat generation in the stator winding, the stator slot oil passage allows the cooling oil to flow directly through this region, maximizing the heat removal efficiency.

[0010] Furthermore, the stator slot oil passage is formed by the internal cavity of an insulating tube, which isolates the winding from the stator slot oil passage. The insulating tube provides physical isolation between the cooling oil and the winding, preventing the cooling oil from damaging the winding insulation layer, while maintaining the fluidity and efficient heat dissipation capacity of the cooling oil.

[0011] Furthermore, the insulating tubes of the stator slot oil passages extend to the outside of the windings at both ends. This design prevents the windings from blocking the openings of the insulating tubes, thus avoiding a reduction in cooling oil flow.

[0012] Furthermore, the stator also includes a slot wedge, which is disposed between the winding and the stator slot opening end of the stator core. The stator slot oil passage is formed in the cavity between the slot wedge, the stator slot of the stator core, and the seal. The stator slot oil passage provides direct cooling to the tooth tip end of the winding near the stator core and effectively utilizes the slot wedge as a barrier to ensure electrical insulation between the cooling oil and the winding.

[0013] Furthermore, the sealing element includes a sealing sleeve, a sealing seat, and a sealing ring. The sealing sleeve is interference-fitted with the tooth crest of the stator core. Both ends of the sealing sleeve are fixedly connected to corresponding end caps via the sealing seat. The sealing ring is disposed on the mounting side of the sealing seat. The sealing structure adopts a static sealing design, avoiding the leakage problems that are prone to occur in dynamic sealing methods. Simultaneously, through the reasonable configuration of the sealing sleeve, sealing seat, and sealing ring, the sealing of the cooling oil and the isolation of the internal and external cavities of the motor are effectively guaranteed, improving the overall reliability of the motor operation.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The cooling oil comes into direct or indirect contact with the heat source (winding) through multiple oil passages distributed in the yoke, teeth and slots of the stator core. This significantly reduces the thermal resistance between the heat source and the cooling medium, improves the heat transfer efficiency, and can more quickly remove the heat from the windings and stator core, thereby effectively controlling the motor temperature rise. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the axial cross-section of a directly cooled oil-cooled motor;

[0018] Figure 2 A schematic diagram of the radial cross-section of a directly cooled oil-cooled motor;

[0019] Figure 3 for Figure 1 Enlarged view of region A in the middle;

[0020] Figure 4 for Figure 2 A magnified view of region B in the middle.

[0021] In the diagram: 1. Frame; 101. Oil inlet; 102. Oil outlet; 2. Stator; 201. Stator core; 202. Winding; 203. Slot wedge; 204. Stator yoke oil passage hole; 205. Stator tooth oil passage hole; 206. Stator slot oil passage hole; 3. End cover; 4. Rotor; 5. Seals; 501. Sealing sleeve; 502. Sealing seat; 503. Sealing ring; 6. Inner cavity; 7. Outer cavity. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0023] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0024] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0025] Please see Figure 1 and Figure 2 As shown, in this embodiment of the utility model, it includes a base 1, a stator 2, two end caps 3, a rotor 4, and a sealing element 5. The two end caps 3 are respectively disposed at both ends of the base 1. The sealing element 5 divides the internal space formed by the base 1 and the two end caps 3 into an inner cavity 6 and an outer cavity 7. The rotor 4 is disposed in the inner cavity 6, and the stator 2 is disposed in the outer cavity 7. The two ends of the base 1 are respectively provided with an oil inlet hole 101 and an oil outlet hole 102 communicating with the outer cavity 7. The stator 2 includes a stator core 201 and several windings 202. The windings 202 are disposed in stator slots in the circumferential direction of the stator core 201. A stator yoke oil passage hole 204 is provided through the part of the stator core 201 opposite to the windings 202. A stator tooth oil passage hole 205 is provided through the teeth of the stator core 201. At least one stator slot oil passage hole 206 is provided in the stator slot of the stator core 201, which penetrates the windings 202.

[0026] Two end caps 3, fitted together with the frame 1, form the overall outer casing of the motor. The motor's interior is separated by a seal 5, forming an inner cavity 6 and an outer cavity 7. The rotor 4 is rotatably connected to the two end caps 3 at both ends within the inner cavity 6, while the stator 2, fitted together with the frame 1, is located within the outer cavity 7. Cooling oil is introduced into the outer cavity 7 through the oil inlet 101. The cooling oil flows from one end of the outer cavity 7 through the stator yoke oil passage 204, stator tooth oil passage 205, and stator slot oil passage 206 to the other end, carrying away heat from the yoke, teeth, and windings 202 on the stator core 201. The stator slot oil passage 206 significantly reduces the thermal resistance between the cooling oil and the windings 202, allowing for faster heat dissipation. This structure is suitable for high-power-density motors. Under high load or high-temperature environments, the efficient heat dissipation of the cooling oil ensures the reliability of the winding insulation material and extends the motor's service life.

[0027] The inner cavity 6 and the outer cavity 7 are sealed and isolated by a sealing element 5, using a static seal to avoid the leakage problems that are prone to occur with dynamic seals. The cooling oil does not need to flow in low-temperature environments, but when the motor operates and generates heat, the temperature of the cooling oil rises, allowing it to flow normally and reducing the power requirements of the cooling system.

[0028] On the radial cross-section of the stator core 201, multiple stator yoke oil passages 204 are circumferentially distributed on the yoke portion of the stator core 201, with each stator yoke oil passage 204 arranged close to the winding 202 in the corresponding stator slot to obtain the shortest heat conduction path. Multiple stator tooth oil passages 205 are circumferentially distributed on the tooth portion of the stator core 201 to dissipate heat from the side of the winding 202. Stator slot oil passages 206 are formed by pre-reserving holes in the slot portion of the stator core 201 or by penetrating the winding 202, maximizing the proximity to the winding 202 to enhance heat dissipation. The stator yoke oil passages 204, stator tooth oil passages 205, and stator slot oil passages 206 form an all-around heat dissipation path for the stator core 201 and the winding 202.

[0029] In one embodiment, see Figure 1 , Figure 2 and Figure 4 As shown, the stator slot oil passage 206 is formed in the middle region of the winding 202. Cooling oil flows through the stator slot oil passage 206 through the middle region of the winding 202, directly contacting the heat-concentrated parts of the winding 202, maximizing the heat removal efficiency of the winding 202. The stator slot oil passage 206 is formed by the internal cavity of an insulating tube. The insulating tube is made of insulating material to ensure electrical insulation and is placed inside the stator slot during winding. This allows communication between the two ends of the outer cavity 7, providing a path for the flow of cooling oil. Both ends of the insulating tube extend to the outside of the winding 202 to prevent the winding 202 from blocking the inlet and outlet of the insulating tube, which would reduce the flow of cooling oil.

[0030] In one embodiment, see Figure 1 , Figure 2 and Figure 4 As shown, the slot wedge 203 is a component in the motor stator 2, typically made of insulating material, located at the stator slot opening of the stator core 201. It is used to fix the winding 202 and provides electrical insulation, mechanical protection, and improved electromagnetic performance. The slot wedge 203 is positioned between the winding 202 and the stator slot opening of the stator core 201. A stator slot oil passage 206 is formed in the cavity between the slot wedge 203, the stator slot of the stator core 201, and the seal 5, allowing communication between the two ends of the outer cavity 7. The stator slot oil passage 206 provides cooling to the winding 202 from the stator slot opening.

[0031] In both embodiments, the stator slot oil passage 206 can be arranged simultaneously in the stator slot to form a combined cooling flow channel.

[0032] Please see Figure 1 and Figure 3As shown, the sealing element 5 includes a sealing sleeve 501, a sealing seat 502, and a sealing ring 503. The sealing sleeve 501 is interference-fitted with the tooth crest of the stator core 201. Both ends of the sealing sleeve 501 are fixedly connected to the corresponding end caps 3 via the sealing seats 502. The sealing ring 503 is located on the mounting side of the sealing seat 502. The sealing sleeve 501 effectively isolates the inner cavity 6 and the outer cavity 7, while the sealing seat 502 ensures that the cooling oil does not leak within the sealing area. The static sealing design, through the interference fit and the elasticity of the sealing ring 503, prevents cooling oil leakage and ensures the reliability of the seal.

[0033] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A direct-cooling oil-cooled motor, characterized in that, include: The machine base (1), stator (2), two end caps (3), rotor (4) and sealing element (5) are respectively disposed at both ends of the machine base (1). The sealing element (5) divides the internal space formed by the machine base (1) and the two end caps (3) into an inner cavity (6) and an outer cavity (7). The rotor (4) is disposed in the inner cavity (6), and the stator (2) is disposed in the outer cavity (7). The two ends of the machine base (1) are respectively provided with an oil inlet (101) and an oil outlet (102) communicating with the outer cavity (7). The stator (2) includes a stator core (201) and a plurality of windings (202). The plurality of windings (202) are disposed in stator slots in the circumferential direction of the stator core (201). A stator yoke oil passage hole (204) is provided through the part of the stator core (201) opposite to the winding (202). A stator tooth oil passage hole (205) is provided through the tooth part of the stator core (201). At least one stator slot oil passage hole (206) is provided in the stator slot of the stator core (201) through the winding (202).

2. The direct-cooling oil-cooled motor according to claim 1, characterized in that, The stator slot oil passage (206) is formed in the middle region of the winding (202).

3. The direct-cooling oil-cooled motor according to claim 2, characterized in that, The stator slot oil passage (206) is formed by the internal cavity of the insulating tube, which isolates the winding (202) from the stator slot oil passage (206).

4. A direct-cooling oil-cooled motor according to claim 3, characterized in that, The insulating tubes of the stator slot oil passage (206) extend to the outside of the winding (202) at both ends.

5. A direct-cooling oil-cooled motor according to claim 1, characterized in that, The stator (2) also includes a slot wedge (203), which is disposed between the winding (202) and the stator slot opening end of the stator core (201). The stator slot oil passage (206) is formed in the cavity between the slot wedge (203), the stator slot of the stator core (201) and the seal (5).

6. A direct-cooling oil-cooled motor according to claim 1, characterized in that, The sealing element (5) includes a sealing sleeve (501), a sealing seat (502), and a sealing ring (503). The sealing sleeve (501) is interference-fitted with the tooth tip of the stator core (201). The two ends of the sealing sleeve (501) are respectively fixedly connected to the corresponding end caps (3) through the sealing seat (502). The sealing ring (503) is disposed on the mounting side of the sealing seat (502).

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