Motor cooling structure, motor, and motor cooling control method

Abstract

A motor cooling structure, motor, and motor cooling control method for cooling the motor. The cooling structure comprises: cooling channels provided on the rotor and stator assemblies; an air guide ring provided within the housing and located at the front ends of the rotor and stator assemblies; an air pressurization structure provided on the housing and located at the rear ends of the rotor and stator assemblies; and an eddy current system provided on the housing. This solution achieves self-cooling of the motor without requiring an additional external heat dissipation system, greatly simplifying the structural design, reducing manufacturing costs and installation difficulty. Cooling air directly acts on the motor, effectively improving heat dissipation efficiency, enhancing the overall performance of the motor, extending the motor's service life, and reducing its failure rate.

Description

Technical Field

[0001] The present invention relates to the technical field of motor structures, and in particular to a motor cooling structure, a motor, and a motor cooling control method. Background Art

[0002] The statements in this section merely provide background technical information related to this application and do not necessarily constitute prior art.

[0003] With the rapid development of new energy vehicles and rail transit, performance requirements for motors are constantly increasing. Especially under conditions of high power density and high speed, motor heat dissipation has become a key factor restricting their development. Traditional motor cooling methods mainly include water cooling and oil cooling. While these methods can meet the motor's heat dissipation requirements to a certain extent, they usually require the addition of an external cooling system, resulting in complex structures, increased manufacturing costs, and a large installation space.

[0004] Among existing cooling technologies, water cooling, while offering a large heat capacity, suffers from low heat dissipation efficiency and bulky size. This is particularly problematic for rotors, which can easily lead to magnet demagnetization and affect motor safety and performance. Oil cooling, on the other hand, suffers from low heat exchange efficiency and complex assembly, hindering the miniaturization and lightweighting of motors. Furthermore, the limited height of the oil coolant level in oil cooling solutions covers some of the heat-generating areas, causing uneven temperatures in these areas and impacting the overall performance and operational reliability of the motor.

[0005] In summary, in the process of implementing the present invention, the applicant discovered that the existing motor cooling method has at least the following problems:

[0006] 1. Traditional motor cooling methods mainly use water cooling and oil cooling, which requires an additional external heat dissipation system, resulting in a complex structure, increased manufacturing costs, and a large installation space.

[0007] 2. While existing water cooling methods have a large heat capacity, they suffer from low heat dissipation efficiency and bulkiness, particularly poor heat dissipation for the rotor, which can easily lead to magnet demagnetization and affect motor safety and performance.

[0008] 3. The oil cooling solution has problems such as low heat exchange efficiency and complex assembly, which is not conducive to the miniaturization and lightweight development of motors;

[0009] 4. The existing technology has the problem of uneven temperature distribution, which affects the overall performance and operational reliability of the motor.

[0010] In view of this, how to solve the above problems existing in the existing motor cooling structure has become the subject to be studied and solved by the present invention. Summary of the Invention

[0011] The present invention provides a motor cooling structure, a motor and a motor cooling control method, the purpose of which is to solve the problems of the motor cooling method in the prior art, such as complex structure, low heat dissipation efficiency, large size and high cost.

[0012] To achieve the above-mentioned purpose, a technical solution adopted in the first aspect of the present invention is: to provide a motor cooling structure for cooling the motor, the motor includes a casing, a rotating shaft, a rotor assembly, and a stator assembly, and the cooling structure includes a cooling channel, an air guide ring, an air boost structure, and an eddy current system.

[0013] A cooling channel is provided on the rotor assembly and the stator assembly. The stator assembly includes a stator body, stator slots, and ventilation holes. There is an air gap between the stator body and the rotor body of the rotor assembly, which surrounds the stator body and runs through both ends of the stator body and the rotor body. The cooling channel is composed of the ventilation holes and the air gap. A heat dissipation outlet is provided on the casing at the rear end of the ventilation holes and the air gap.

[0014] An air guide ring is arranged inside the casing and at the front end of the rotor assembly and the stator assembly. The air guide ring is made of insulating material. The air guide ring has a first flow channel corresponding to the ventilation hole and a second flow channel corresponding to the air gap. The air guide ring is provided with an air guide inlet connected to the first flow channel and the second flow channel.

[0015] An air boost structure is provided on the casing and located at the rear end of the rotor assembly and the stator assembly. The air boost structure includes an air boost chamber and a boost impeller. The air boost chamber has a boost air inlet and a boost air outlet. The boost air inlet is connected to the inner cavity of the motor through an air pipe and is connected to the external atmosphere.

[0016] A vortex system is provided on the casing, and the vortex system includes a vortex chamber and a vortex tube. The vortex chamber is provided with a vortex tube. The vortex chamber has a vortex air inlet connected to the boost air outlet, a cold air outlet connected to the wind guide air inlet, and a hot air outlet connected to the external atmosphere.

[0017] The motor cooling structure is configured as follows: when the motor is running, the rotating shaft drives the boost impeller to rotate, forming a high-pressure air channel between the boost impeller and the inner wall of the boost chamber, and the high-pressure air enters the vortex chamber and rotates in the vortex tube. The generated cold air is guided to the cooling channel through the cold air outlet and the air guide ring. After heat exchange in the cooling channel, the cold air is discharged to the external atmosphere and / or the boost air inlet through the heat dissipation outlet.

[0018] A technical solution adopted in the second aspect of the present invention is: a motor is proposed, which includes a casing and a rotating shaft, and a cavity is provided in the casing. The motor includes the motor cooling structure as described in the first aspect of the present invention.

[0019] A third aspect of the present invention adopts a technical solution: a motor cooling control method is proposed, wherein the motor cooling control method performs cooling control based on the motor cooling structure as described in the first aspect of the present invention, and the motor cooling control method includes the following steps:

[0020] The motor cooling structure is assembled in the motor, and the eddy current system of the motor cooling structure is equipped with a temperature regulating valve;

[0021] When the motor is running, the air boost mechanism generates different positive pressure environments at different motor speeds, and the rotor assembly and stator assembly generate different amounts of heat at different speeds;

[0022] When the motor is in a first speed range, the temperature regulating valve sets a first control temperature according to the motor speed;

[0023] When the motor is in the second speed range, the temperature regulating valve sets a second control temperature according to the motor speed;

[0024] When the motor is in the third speed range, the temperature regulating valve sets the third control temperature according to the motor speed;

[0025] Or the electric temperature control valve controls the temperature linearly according to the speed of the motor.

[0026] The design principle and technical concept of the present invention are:

[0027] In the present invention, some problems existing in the existing motor cooling structure are studied, such as the need to add an additional external heat dissipation system, which leads to a complex structure. Although the water cooling method has a large heat capacity, it has low heat dissipation efficiency and a large volume. The oil cooling solution has problems such as low heat exchange efficiency and complex assembly, as well as the problem of uneven temperature distribution, which affects the overall performance and operational reliability of the motor. In response to the continuous improvement of the performance requirements of motors in existing new energy vehicles and rail transit, and the urgent need for miniaturization and lightweight development of motors, the motor cooling structure of the present invention, the motor using the motor cooling structure, and the motor cooling control method based on the motor cooling structure for cooling control are designed.

[0028] In order to meet the above-mentioned special circumstances and special requirements, the present invention designs the main parts of the motor cooling structure to include a cooling channel, an air guide ring, an air pressurization structure, and an eddy current system; wherein the cooling channel is composed of ventilation holes on the stator body and an air gap between the stator body and the rotor body. When the motor is running, the stator body and the rotor body serve as the main heat sources, and the cooling channel is directly arranged around the heat source. During subsequent cooling, good heat exchange effect and uniform cooling are ensured, so that the performance of the motor remains stable; at the same time, the cooling channel is designed in conjunction with the air guide ring. The air guide ring has a first flow channel corresponding to the ventilation holes and a second flow channel corresponding to the air gap, so that the cold air can directly enter the ventilation holes and air gaps evenly through the air guide ring made of insulating material, so that the temperature of the cold air passing through the air guide ring will not drop, thereby achieving uniform distribution of cold air and effectively solving the uneven temperature distribution in the prior art. problem; an air boost structure is set at one end of the motor, and an eddy current system is used to cooperate, which effectively transmits the pressurized air brought by the rotation of the motor itself to the eddy current tube of the eddy current system for cold and hot air diversion, and directly acts on the direct heat source of the motor through the air guide ring to discharge the hot air, thereby realizing self-cooling of the motor. There is no need to add an external heat dissipation system, which greatly simplifies the structural design, reduces the manufacturing cost and installation difficulty. The cold air acts directly on the motor, effectively improves the heat dissipation efficiency, and solves the problem of low heat dissipation efficiency of traditional water cooling. Moreover, the combined design of the air boost structure and the eddy current system adopted is compact and can be installed inside or outside the motor, occupying very little space, overcoming the shortcomings of traditional water cooling and oil cooling solutions that are bulky and occupy a large space, can effectively cool the motor stator and rotor, improve the overall performance of the motor, extend the service life of the motor, and reduce the failure rate.

[0029] The relevant contents of the present invention are explained as follows:

[0030] 1. In the description of this application, it should be understood that the terms "front," "rear," "inner," "outer," "axial," "radial," and "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of this application. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on this application.

[0031] 2. In this application, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed, removable, or integrated connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interactions between two components, unless otherwise expressly defined. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] 3. In the description of this application, the terms "first," "second," etc. are used solely for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically specified.

[0033] 4. In the above technical solution of the present invention, the boost chamber and the boost impeller adopt an eccentric design, the outer diameter of the boost impeller and the inner diameter of the boost chamber are not equal in circumferential distance, and the circumferential distance between the two is the smallest at the boost outlet. With this design, the boost efficiency of the boost impeller is improved. During the operation of the motor, as the motor speed increases, more stable and high-pressure boost gas can be provided, so that the vortex tube can generate more cold air and lower temperature.

[0034] 5. In the above technical solution of the present invention, the boost impeller adopts a straight blade structure. During the operation of the motor, both the forward and reverse rotation of the rotating shaft pump external air into the boost chamber to form high-pressure air, thereby ensuring that the vortex tube can always be pumped with high-pressure gas during the operation of the motor. The cold air is then separated through the vortex tube to continuously cool the stator and rotor.

[0035] 6. In the above technical solution of the present invention, the boost chamber is integrally or separately arranged with the casing; when the boost chamber is integrally arranged with the casing, a partition is arranged between the boost chamber and the chamber in the casing. The integral arrangement can make the structure more compact and further reduce the volume; when the boost chamber is separately arranged with the casing, the boost chamber is arranged at the rear end of the casing, and the boost impeller is arranged at the rear end of the casing where the rotating shaft extends out of the casing. The separate arrangement provides convenience in maintenance and repair.

[0036] 7. In the above technical solution of the present invention, the stator slots are circumferentially arranged on the inner wall of the inner ring of the stator body. A circle of ventilation holes is symmetrically arranged around the stator slots, with one ventilation hole corresponding to each stator slot. The first flow channel on the air guide ring is aligned with the ventilation holes, and the cross-sectional shape of the first flow channel on the air guide ring matches the shape of the ventilation holes. This arrangement ensures a more even distribution of cooling channels over the heat source. Furthermore, the alignment of the first flow channel with the ventilation holes and the cross-sectional shape of the first flow channel match the shape of the ventilation holes, allowing cool air to be directly introduced from the first flow channel into the ventilated air, providing direct cooling and heat exchange for the stator body, which heats up during motor operation.

[0037] 8. In the above technical solution of the present invention, the air gap between the stator and rotor bodies is located within the inner ring of the ventilation holes. The second flow channel on the air guide ring is aligned with the air gap, and the cross-sectional shape of the second flow channel on the air guide ring is a multi-segment arc. This arrangement allows the cooling channels to be more evenly distributed over the heat source. Furthermore, the multi-segment arc-shaped cross-sectional shape of the second flow channel on the air guide ring matches the shape of the air gap, allowing cool air to be directly introduced into the ventilation air through the second flow channel, providing direct cooling and heat exchange to the stator and rotor bodies, which heat up during motor operation.

[0038] 9. In the above technical solution of the present invention, the air guide ring has an air guide chamber. The air guide chamber is formed with a plurality of hollow cylinders arranged around it toward the rear end. The hollow cylinders at least partially extend into the ventilation holes of the stator body. The internal hollow structure of the hollow cylinders forms a first flow channel connecting the air guide chamber and the ventilation holes. The air guide chamber is also formed with a plurality of arcuate grooves arranged around the inner ring of the hollow cylinder toward the rear end. These arcuate grooves form a second flow channel connecting the air guide chamber and the air gap. This arrangement further enhances the cooling effect between the air guide ring and the cooling channel. The use of vortex tube cooling technology, combined with the special cooling channel design of the stator and rotor, achieves efficient cooling of the motor, effectively reducing its operating temperature.

[0039] 10. In the above technical solution of the present invention, the hot gas outlet of the vortex system is connected to the external atmosphere through a hot gas pipe. The hot gas pipe is provided with a temperature regulating valve. The temperature regulating valve is a self-operated temperature regulating valve or an electric temperature regulating valve. The temperature regulating valve automatically adjusts the pressure of the compressed air according to the temperature on the hot gas pipe to better maintain the set temperature, or linearly controls the temperature according to the speed of the motor.

[0040] 11. In the above technical solution of the present invention, in the motor cooling control method, the first speed range, the second speed range, and the third speed range can be set in sequence from small to large; the first control temperature, the second control temperature, and the third control temperature set by the temperature regulating valve can be set in sequence from high to low.

[0041] Due to the application of the above scheme, the present invention has the following advantages and effects compared with the prior art:

[0042] 1. The above-mentioned solution of the present invention is designed to address the ever-increasing performance requirements of motors in existing new energy vehicles and rail transit, as well as the urgent need for miniaturization and lightweight development of motors. The motor cooling structure of the present invention, a motor using the motor cooling structure, and a motor cooling control method for cooling control based on the motor cooling structure are designed.

[0043] 2. In the above scheme of the present invention, the present invention designs the main parts of the motor cooling structure to include a cooling channel, an air guide ring, an air pressurization structure, and an eddy current system; wherein the cooling channel is composed of ventilation holes on the stator body and an air gap between the stator body and the rotor body. When the motor is running, the stator body and the rotor body serve as the main heat sources. The cooling channel is directly arranged around the heat source. During the subsequent cooling, a good heat exchange effect and uniform cooling are ensured, so that the performance of the motor remains stable. At the same time, the cooling channel cooperates with the design of the air guide ring. The air guide ring has a first flow channel corresponding to the ventilation holes and a second flow channel corresponding to the air gap, so that the cold air can directly The air guide ring made of thermal insulation material evenly enters each ventilation hole and air gap, so that the temperature of the cold air passing through the air guide ring will not drop, thus achieving uniform distribution of cold air and effectively solving the problem of uneven temperature distribution in the prior art; an air boost structure is set at one end of the motor, and an eddy current system is used to cooperate, so that the pressurized air brought by the rotation of the motor itself is effectively delivered to the eddy current tube of the eddy current system for cold and hot air diversion, and the cold air is directly applied to the direct heat source of the motor through the air guide ring, and the hot air is discharged, thereby achieving self-cooling of the motor without the need for an additional external heat dissipation system, which greatly simplifies the structural design and reduces the manufacturing cost and installation difficulty.

[0044] 3. In the above solution of the present invention, the cold air converted by the vortex tube is directly applied to the motor, which effectively improves the heat dissipation efficiency and solves the problem of low heat dissipation efficiency of traditional water cooling. In addition, the combined design of the air boost structure and the vortex system adopted is compact and can be installed inside or outside the motor, occupying very little space. It overcomes the shortcomings of traditional water cooling and oil cooling solutions that are bulky and occupy a large space, can effectively cool the motor stator and rotor, improve the overall performance of the motor, extend the service life of the motor, and reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Attachment Figure 1 2. A schematic diagram of the overall structure of a motor according to an embodiment of the present invention (viewing angle 1);

[0046] Attachment Figure 2 2. A schematic diagram of the overall structure of a motor according to an embodiment of the present invention (second perspective);

[0047] Attachment Figure 3 2 is a schematic cross-sectional view of a motor according to an embodiment of the present invention (viewing angle 1);

[0048] Attachment Figure 4 2 is a schematic cross-sectional view of a motor according to an embodiment of the present invention (viewing angle 2);

[0049] Attachment Figure 5 2 is a schematic cross-sectional view of a motor according to an embodiment of the present invention (viewing angle 3);

[0050] Attachment Figure 62 is a schematic cross-sectional view of a motor according to an embodiment of the present invention (viewing angle 4);

[0051] Attachment Figure 7 2 is a schematic cross-sectional view of a motor according to an embodiment of the present invention (viewing angle 5);

[0052] Attachment Figure 8 2 is a schematic cross-sectional view of a motor according to an embodiment of the present invention (viewing angle 6);

[0053] Attachment Figure 9 Schematic diagram of a three-dimensional air guide ring in an embodiment of the present invention;

[0054] Attachment Figure 10 is a schematic three-dimensional cross-sectional view of an air guide ring in an embodiment of the present invention;

[0055] Attachment Figure 11 Schematic cross-sectional view of the air guide ring in an embodiment of the present invention.

[0056] The various parts of the above drawings are shown as follows:

[0057] 1. Casing; 11. Heat dissipation vent;

[0058] 2. Rotating shaft;

[0059] 3. Stator assembly; 31. Stator body; 32. Stator slots; 33. Ventilation holes;

[0060] 4. Rotor assembly; 41. Rotor body; 42. Air gap;

[0061] 5. Air guide ring; 50. Air guide chamber; 51. First flow channel; 52. Second flow channel; 53. Air guide inlet;

[0062] 6. Air boost structure; 61. Air boost chamber; 62. Boost impeller; 63. Boost air inlet; 64. Boost air outlet;

[0063] 7. Vortex system; 71. Vortex chamber; 72. Vortex tube; 73. Vortex air inlet; 74. Cold air outlet; 75. Hot air outlet. DETAILED DESCRIPTION

[0064] The present invention will be clearly illustrated below with drawings and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art will be able to make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0065] The present invention aims to solve the problem that the existing motor cooling structure requires an additional external heat dissipation system, resulting in a complex structure. Although the water cooling method has a large heat capacity, it has low heat dissipation efficiency and a large volume. The oil cooling solution has problems such as low heat exchange efficiency and complex assembly, as well as uneven temperature distribution. The present invention has designed a motor cooling structure, a motor using the motor cooling structure, and a motor cooling control method based on the motor cooling structure for cooling control.

[0066] Example 1, as shown in the attached Figure 1 To the attached Figure 11 As shown, a motor cooling structure disclosed in embodiment 1 of the present invention is used for cooling the motor. The motor includes a casing 1, a rotating shaft 2, a rotor assembly 4, and a stator assembly 3. The cooling structure includes a cooling channel, an air guide ring 5, an air boost structure 6, and an eddy current system 7.

[0067] A cooling channel is provided on the rotor assembly 4 and the stator assembly 3. The stator assembly 3 includes a stator body 31, a stator slot 32, and a ventilation hole 33. There is an air gap 42 between the stator body 31 and the rotor body 41 of the rotor assembly 4, which surrounds the stator body 31 and runs through both ends of the stator body 31 and the rotor body 41. The cooling channel is composed of the ventilation holes 33 and the air gap 42. A heat dissipation outlet 11 is provided on the casing 1 at the rear end of the ventilation holes 33 and the air gap 42.

[0068] An air guide ring 5 is arranged inside the casing 1 and at the front end of the rotor assembly 4 and the stator assembly 3. The air guide ring 5 is made of insulating material. The air guide ring 5 has a first flow channel 51 corresponding to the ventilation hole 33 and a second flow channel 52 corresponding to the air gap 42. The air guide ring 5 is provided with an air guide inlet 53 connected to the first flow channel 51 and the second flow channel 52.

[0069] An air boost structure 6 is provided on the casing 1 and located at the rear end of the rotor assembly 4 and the stator assembly 3. The air boost structure 6 includes an air boost chamber 61 and a boost impeller 62. The air boost chamber 61 has a boost air inlet 63 and a boost air outlet 64. The boost air inlet 63 is connected to the inner cavity of the motor through an air pipe and is connected to the external atmosphere.

[0070] A vortex system 7 is provided on the casing 1, and the vortex system 7 includes a vortex chamber 71 and a vortex tube 72. The vortex chamber 71 is provided with a vortex tube 72. The vortex chamber 71 has a vortex air inlet 73 connected to the boost air outlet 64, a cold air outlet 74 connected to the wind guide air inlet 53, and a hot air outlet 75 connected to the external atmosphere.

[0071] The motor cooling structure is configured as follows: when the motor is running, the rotating shaft 2 drives the boost impeller 62 to rotate, forming a high-pressure air channel between the boost impeller 62 and the inner wall of the boost chamber, and the high-pressure air enters the vortex chamber 71 and rotates in the vortex tube 72. The generated cold air is guided to the cooling channel through the cold air outlet 74 and the air guide ring 5. After heat exchange in the cooling channel, the cold air is discharged to the external atmosphere and / or the boost air inlet 63 through the heat dissipation outlet 11.

[0072] The working process of the first embodiment of the present invention can be referred to as follows:

[0073] When the motor is running, the motor shaft 2 drives the supercharger impeller 62 to rotate at high speed, forming a high-pressure air channel between the supercharger impeller 62 and the inner wall of the air plenum 61. Air is drawn into the air plenum 61 through the supercharger inlet 63 and discharged into the vortex tube 72 through the supercharger outlet 64. The air rotates within the vortex tube 72, cooling it to below zero degrees Celsius and forming a cold air flow. This cold air flow is evenly distributed through the cold air outlet 74, the air inlet 53, and the air guide ring 5 to the cooling channels on the rotor assembly 4 and the stator assembly 3, cooling the stator and rotor.

[0074] During the cooling process, the cooling medium absorbs a significant amount of heat. After flowing through the stator and rotor surfaces, the heated cooling medium is discharged into the atmosphere through the rear heat dissipation outlet 11. The design of the vortex tube 72 effectively separates cold and hot air, avoiding the mixing of cooling media found in traditional water and oil cooling solutions and improving heat dissipation efficiency.

[0075] Through the implementation of the above-mentioned embodiment 1 of the present invention, the main parts of the motor cooling structure are designed to include a cooling channel, an air guide ring 5, an air pressurization structure 6, and an eddy current system 7; wherein the cooling channel is composed of the ventilation holes 33 on the stator body 31 and the air gap 42 between the stator body 31 and the rotor body 41. When the motor is running, the stator body 31 and the rotor body 41 serve as the main heat source. The cooling channel is directly arranged around the heat source. During the subsequent cooling, the heat exchange effect is good and the cooling is uniform, so that the performance of the motor remains stable. At the same time, the cooling channel cooperates with the design of the air guide ring 5. The air guide ring 5 has a first flow channel 51 corresponding to the ventilation hole 33 and a second flow channel 52 corresponding to the air gap 42, so that the cold air directly enters the ventilation holes 33 and the air gap 42 evenly through the air guide ring 5 made of insulating material, so that the temperature of the cold air passing through the air guide ring 5 will not drop, thereby achieving uniform distribution of the cold air and effectively solving the existing The problem of uneven temperature distribution in the technology is solved; an air boost structure 6 is set at one end of the motor, and a vortex system 7 is used to cooperate, so that the pressurized air brought by the rotation of the motor itself is effectively delivered to the vortex tube 72 of the vortex system 7 for cold and hot air diversion, and the cold air is directly applied to the direct heat source of the motor through the air guide ring 5, and the hot air is discharged, thereby realizing self-cooling of the motor. There is no need to add an additional external heat dissipation system, which greatly simplifies the structural design, reduces the manufacturing cost and installation difficulty, and the cold air acts directly on the motor, effectively improving the heat dissipation efficiency, and solving the problem of low heat dissipation efficiency of traditional water cooling. Moreover, the combined design of the air boost structure 6 and the vortex system 7 is compact and can be installed inside or outside the motor, occupying very little space, overcoming the shortcomings of traditional water cooling and oil cooling solutions that are bulky and occupy a large space, and can effectively cool the motor stator and rotor, improve the overall performance of the motor, extend the service life of the motor, and reduce the failure rate.

[0076] Embodiment 2. Embodiment 2 of the present invention proposes a motor cooling structure for cooling the motor, wherein the motor includes a casing 1, a rotating shaft 2, a rotor assembly 4, and a stator assembly 3. The cooling structure includes a cooling channel, an air guide ring 5, an air boosting structure 6, and an eddy current system 7, wherein the boosting chamber in the air boosting structure 6 is integrated with the casing 1, and a partition is provided between the boosting chamber and the chamber in the casing 1.

[0077] In the second embodiment of the present invention, the cooling channel is composed of the ventilation holes 33 on the stator body 31 and the air gap 42 between the stator body 31 and the rotor body 41. The air guide ring 5 is made of insulating material. The air guide ring 5 has a first flow channel 51 corresponding to the ventilation holes 33 and a second flow channel 52 corresponding to the air gap 42. The air guide ring 5 is provided with an air guide inlet 53 connected to the first flow channel 51 and the second flow channel 52; the inner wall of the inner ring of the stator body 31 is provided with the stator slot 32 along the circumferential direction, and a circle of ventilation holes 33 is symmetrically provided on the outer periphery of the stator slot 32, wherein each stator slot 32 is corresponding to a ventilation hole 33, and the first flow channel 51 on the air guide ring 5 is aligned with the ventilation hole 33, and the cross-sectional shape of the first flow channel 51 on the air guide ring 5 is adapted to the shape of the ventilation hole 33. With this arrangement, the cooling channels are arranged more evenly on the heat source. At the same time, the first flow channel 51 is designed to be aligned with the ventilation hole 33, and the cross-sectional shape of the first flow channel 51 is adapted to the shape of the ventilation hole 33, so that the cold air is directly introduced into the ventilation air from the first flow channel 51, and the stator body 31 whose temperature rises when the motor is running is directly cooled and heat exchanged.

[0078] Specifically, the air gap 42 between the stator body 31 and the rotor body 41 is located within the inner circle of the ventilation holes 33. The second flow channel 52 on the air guide ring 5 is aligned with the air gap 42. The cross-section of the second flow channel 52 on the air guide ring 5 is shaped as multiple arc segments. This arrangement allows the cooling channels to be more evenly distributed over the heat source. Furthermore, the cross-section of the second flow channel 52 on the air guide ring 5 is designed as multiple arc segments to match the shape of the air gap 42. This allows cold air to be directly introduced into the ventilation air through the second flow channel 52, providing direct cooling and heat exchange to the stator body 31 and rotor body 41, which heat up during motor operation.

[0079] Furthermore, the air guide ring 5 has an air guide chamber 50. This chamber 50 is formed with a plurality of hollow cylinders arranged around it toward the rear end. These cylinders at least partially extend into the ventilation holes 33 of the stator body 31. The internal hollow structure of these cylinders forms a first flow channel 51 connecting the air guide chamber 50 and the ventilation holes 33. The air guide chamber 50 is also formed with a plurality of arcuate grooves arranged around it at intervals toward the rear end. These arcuate grooves form a second flow channel 52 connecting the air guide chamber 50 and the air gap 42. This arrangement further enhances the cooling effect between the air guide ring 5 and the cooling channel. The use of vortex tube 72 cooling technology, combined with the special cooling channel design of the stator and rotor, achieves efficient cooling of the motor, effectively reducing its operating temperature.

[0080] In the second embodiment of the present invention, the air boost structure 6 is provided on the casing 1 and is located at the rear end of the rotor assembly 4 and the stator assembly 3. The air boost structure 6 includes an air boost chamber 61 and a boost impeller 62. The air boost chamber 61 has a boost air inlet 63 and a boost air outlet 64. The boost air inlet 63 is connected to the inner cavity of the motor through an air pipe and is connected to the external atmosphere.

[0081] Specifically, the boost chamber and the boost impeller 62 adopt an eccentric design, the outer diameter of the boost impeller 62 and the inner diameter of the boost chamber are not equal in circumferential distance, and the circumferential distance between the two is the smallest at the boost outlet 64. With this design, the boost efficiency of the boost impeller 62 is improved. During the operation of the motor, as the motor speed increases, more stable and high-pressure boost gas can be provided, so that the vortex tube 72 can generate more cold air and lower temperature.

[0082] Furthermore, the boost impeller 62 adopts a straight blade structure. During the operation of the motor, the forward and reverse rotation of the shaft 2 will pump external air into the boost chamber to form high-pressure air, thereby ensuring that the vortex tube 72 can always be pumped with high-pressure gas during the operation of the motor, and then the separated cold air is continuously cooled by the vortex tube 72 to cool the stator and rotor.

[0083] In the second embodiment of the present invention, a vortex system 7 is provided on the casing 1, and the vortex system 7 includes a vortex chamber 71 and a vortex tube 72. The vortex chamber 71 is provided with a vortex tube 72. The vortex chamber 71 has a vortex air inlet 73 connected to the boost air outlet 64, a cold air outlet 74 connected to the wind guide air inlet 53, and a hot air outlet 75 connected to the external atmosphere.

[0084] Specifically, the hot air outlet 75 of the vortex system 7 is connected to the external atmosphere through a hot air pipe. A temperature regulating valve is provided on the hot air pipe. The temperature regulating valve adopts a self-operated temperature control valve or an electric temperature control valve. The temperature regulating valve automatically adjusts the pressure of the compressed air according to the temperature on the hot air pipe to better maintain the set temperature, or controls the temperature linearly according to the speed of the motor.

[0085] Embodiment 3. Embodiment 3 of the present invention proposes a motor, which includes a housing 1 and a rotating shaft 2. The housing 1 has a cavity. The motor includes a motor cooling structure as described in Embodiment 1 or Embodiment 2 of the present invention. The motor has high overall performance and operational reliability, and has a miniaturized and lightweight structural design, and can be applied to motor drives for new energy vehicles and rail transit.

[0086] Embodiment 4. Embodiment 3 of the present invention provides a motor cooling control method. The motor cooling control method performs cooling control based on the motor cooling structure described in Embodiment 1 or Embodiment 2 of the present invention. The motor cooling control method includes the following steps:

[0087] The motor cooling structure is assembled in the motor, and the eddy current system 7 of the motor cooling structure is equipped with a temperature regulating valve;

[0088] When the motor is running, the air boost mechanism generates different positive pressure environments at different motor speeds, and the rotor assembly 4 and the stator assembly 3 generate different amounts of heat at different speeds;

[0089] When the motor is in a first speed range, the temperature regulating valve sets a first control temperature according to the motor speed;

[0090] When the motor is in the second speed range, the temperature regulating valve sets a second control temperature according to the motor speed;

[0091] When the motor is in the third speed range, the temperature regulating valve sets the third control temperature according to the motor speed;

[0092] Or the electric temperature control valve controls the temperature linearly according to the speed of the motor.

[0093] In embodiment three of the present invention, the first speed range, the second speed range, and the third speed range can be set in sequence from small to large; the first control temperature, the second control temperature, and the third control temperature set for the temperature regulating valve can be set in sequence from high to low.

[0094] Through the implementation of the above embodiments, through the combination of the air boost structure 6 and the vortex system 7, and the combination of the vortex system 7, the air guide ring 5, and the cooling channel, the cold air converted through the vortex tube 72 is directly applied to the motor, thereby effectively improving the heat dissipation efficiency and solving the problem of low heat dissipation efficiency of traditional water cooling. The overall combined design is compact and can be installed inside or outside the motor, occupying very little space. It overcomes the shortcomings of traditional water cooling and oil cooling solutions that are bulky and occupy a large space, can effectively cool the motor stator and rotor, improves the overall performance of the motor, extends the service life of the motor, and reduces the failure rate, thereby achieving the purpose of the present invention.

[0095] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. The motor cooling structure is used for cooling the motor. The motor includes a housing, a rotating shaft, a rotor assembly, and a stator assembly. It is characterized in that: The cooling structure comprises: A cooling channel is provided on the rotor assembly and the stator assembly. The stator assembly includes a stator body, stator slots, and ventilation holes. An air gap is provided between the stator body and the rotor body of the rotor assembly, which surrounds the stator body and penetrates both ends of the stator body and the rotor body. The cooling channel is composed of the ventilation holes and the air gap. A heat dissipation outlet is provided on the housing at the rear end of the ventilation holes and the air gap. An air guide ring is provided inside the casing and at the front end of the rotor assembly and the stator assembly. The air guide ring is made of a heat-insulating material and has a first flow channel corresponding to the ventilation hole and a second flow channel corresponding to the air gap. The air guide ring is provided with an air guide inlet connected to the first flow channel and the second flow channel; An air boost structure is provided on the housing and located at the rear end of the rotor assembly and the stator assembly. The air boost structure includes an air boost chamber and a boost impeller. The air boost chamber has a boost air inlet and a boost air outlet. The boost air inlet is connected to the motor cavity through an air pipe and is connected to the external atmosphere. A vortex system is provided on the housing, the vortex system comprising a vortex chamber and a vortex tube. The vortex chamber is provided with a vortex tube. The vortex chamber has a vortex air inlet connected to the supercharged air outlet, a cold air outlet connected to the air guide inlet, and a hot air outlet connected to the external atmosphere. The motor cooling structure is configured as follows: when the motor is running, the rotating shaft drives the boost impeller to rotate, forming a high-pressure air channel between the boost impeller and the inner wall of the boost chamber, and the high-pressure air enters the vortex chamber and rotates in the vortex tube. The generated cold air is guided to the cooling channel through the cold air outlet and the air guide ring. After heat exchange in the cooling channel, the cold air is discharged to the external atmosphere and / or the boost air inlet through the heat dissipation outlet.

2. The motor cooling structure according to claim 1, characterized in that: The boost chamber and the boost impeller are designed to be eccentric, the outer diameter of the boost impeller and the inner diameter of the boost chamber are not the same in circumferential direction, and the circumferential distance between the two is the smallest at the boost air outlet.

3. The motor cooling structure according to claim 1, characterized in that: The boost impeller adopts a straight blade structure. During the operation of the motor, both the forward and reverse rotation of the rotating shaft pumps external air into the boost chamber to form high-pressure air.

4. The motor cooling structure according to claim 1, characterized in that: The boost chamber is integrally or separately arranged with the casing; When the boost chamber is integrally provided with the casing, a partition is provided between the boost chamber and the chamber in the casing; When the boost chamber is separately provided from the casing, the boost chamber is provided at the rear end of the casing, and the boost impeller is provided at the rear end of the casing where the rotating shaft extends out.

5. The motor cooling structure according to claim 1, characterized in that: The stator slots are arranged on the inner wall of the inner ring of the stator body along the circumferential direction, and a circle of ventilation holes are symmetrically arranged around the outer periphery of the stator slots, wherein each stator slot corresponds to a ventilation hole, and the first flow channel on the air guide ring is aligned with the ventilation hole, and the cross-sectional shape of the first flow channel on the air guide ring is adapted to the shape of the ventilation hole.

6. The motor cooling structure according to claim 5, characterized in that: The air gap between the stator body and the rotor body is located in the inner circle of the ventilation hole, and the second flow channel on the air guide ring is aligned with the air gap. The cross-section shape of the second flow channel on the air guide ring is multiple arc segments.

7. The motor cooling structure according to claim 5, characterized in that: The air guide ring has an air guide chamber, and the air guide chamber is formed with a plurality of hollow cylinders arranged in a surrounding manner toward the rear end. The hollow cylinders at least partially extend into the ventilation holes of the stator body, and the internal hollow structure of the hollow cylinders forms a first flow channel connecting the air guide chamber and the ventilation holes; the air guide chamber is provided with a plurality of arc grooves arranged in a surrounding manner at intervals in the inner circle of the hollow cylinder toward the rear end, and the arc grooves constitute a second flow channel connecting the air guide chamber and the air gap.

8. The motor cooling structure according to claim 1, characterized in that: The hot air outlet of the vortex system is connected to the external atmosphere through a hot air pipe. A temperature regulating valve is provided on the hot air pipe. The temperature regulating valve is a self-operated temperature control valve or an electric temperature control valve.

9. A motor, characterized in that: The motor includes a housing and a rotating shaft. The housing has a cavity therein. The motor includes the motor cooling structure according to any one of claims 1 to 8.

10. A motor cooling control method, characterized in that: The motor cooling control method performs cooling control based on the motor cooling structure according to any one of claims 1 to 8, and the motor cooling control method includes the following: The motor cooling structure is assembled in the motor, and the eddy current system of the motor cooling structure is equipped with a temperature regulating valve; When the motor is running, the air boost mechanism generates different positive pressure environments at different motor speeds, and the rotor assembly and stator assembly generate different amounts of heat at different speeds; When the motor is in a first speed range, the temperature regulating valve sets a first control temperature according to the motor speed; When the motor is in the second speed range, the temperature regulating valve sets a second control temperature according to the motor speed; When the motor is in the third speed range, the temperature regulating valve sets the third control temperature according to the motor speed; Or the electric temperature control valve controls the temperature linearly according to the speed of the motor.

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