A magnetic flux switching permanent magnet drive cooling system for a profiled stator

Abstract

This invention relates to the field of permanent magnet drive cooling, and more particularly to a flux-switching permanent magnet drive cooling system for irregularly shaped stators, comprising: a housing; stator assemblies, with permanent magnets between two adjacent sets of stator assemblies, and cooling channels spaced apart from the housing, wherein the circumferential diameter of the cooling channels tapers radially towards the central axis of the stator assemblies to the end face of the permanent magnets; cooling water channels passing through the cooling channels, with water-cooled medium flowing inside for cooling and heat dissipation of the stator assemblies and permanent magnets; the cooling channels are trapezoidal in shape, with their circumferentially inclined sidewalls tapering towards the permanent magnets; the cooling water channels are trapezoidal pipes. This invention enables surface cooling of the stator assemblies, avoiding the problems of low heat dissipation efficiency and localized overheating caused by insufficient cooling capacity of the outer periphery of the housing, and significantly improving the heat dissipation effect of flux-switching drive motors.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet drive cooling, and more particularly to a flux-switching permanent magnet drive cooling system for irregularly shaped stators. Background Technology

[0002] Flux-switching permanent magnet machines (FSPMs) have been widely used in recent years in aerospace, electric vehicles, and underwater propulsion applications where high power density and reliability are required, due to their compact structure, rotor without windings and permanent magnets, high power density, strong torque output, and high reliability. In typical FSPMs, compared to other types of motors, the stator simultaneously incorporates permanent magnets and windings, resulting in a complex structure, concentrated heat sources, and greater difficulty in heat dissipation management. Since both the permanent magnets and silicon steel sheets in the stator are temperature-sensitive materials, overheating can not only cause magnetic degradation but may also lead to irreversible demagnetization, thus affecting the overall performance and lifespan of the machine.

[0003] Currently, in traditional flux-switching motor water-cooling technology applications, the common practice is to arrange the water-cooling system around the outer periphery of an aluminum or steel casing. Because aluminum and steel have only moderate thermal conductivity, they impede heat transfer, easily creating thermal resistance between the stator heat source inside the casing and the cooling medium on the outer periphery. During heat transfer from the stator or other heat sources to the water channels, not only is some energy not effectively transferred due to the casing's thermal resistance, but the casing's insulation further weakens the cooling system's ability to directly act on the heat source. This is particularly evident in high-power-density equipment or under conditions of high heat flux, easily leading to low heat dissipation efficiency and localized overheating, thus affecting the overall performance of the flux-switching motor.

[0004] In addition, some cooling solutions enhance heat dissipation by designing water channels in the winding area, but this often reduces the effective winding slot area, forcing the winding cross-section to decrease, thereby increasing the unit resistance of the winding, significantly increasing winding copper losses, reducing motor efficiency, and causing additional heat generation.

[0005] Therefore, how to improve the cooling water channel structure of flux-switching motors to directly cool the stator assembly without sacrificing the winding slot area is a technical problem that needs to be solved. Summary of the Invention

[0006] To address this, the present invention provides a flux-switching permanent magnet drive cooling system for irregularly shaped stators. By extending the end of a retractable cooling channel directly to the end face of the stator assembly, minimizing the spacing between them, a surface-to-surface cooling effect is achieved for the stator assembly. This avoids the problems of low heat dissipation efficiency and localized overheating caused by insufficient cooling capacity of the outer periphery of the housing for the stator assembly, significantly improving the heat dissipation effect of the flux-switching drive motor.

[0007] To achieve the above objectives, this invention proposes a flux-switching permanent magnet driven cooling system for irregularly shaped stators, comprising:

[0008] chassis;

[0009] A stator assembly is located inside the housing. There is a permanent magnet between two adjacent stator assemblies and a cooling channel formed at a distance from the housing. The diameter of the cooling channel is radially constricted towards the central axis of the stator assembly along the circumferential surface of the cooling channel to the end face of the permanent magnet.

[0010] Cooling water channels are provided through the cooling passages and are filled with water-cooling medium to cool and dissipate heat from the stator assembly and the permanent magnet.

[0011] The cooling channel is trapezoidal in shape, and its circumferential inclined sidewalls are inclined and tapered from the housing towards the permanent magnet;

[0012] The cooling water channel is a trapezoidal pipe that runs through and is embedded in the cooling channel, and contacts the inclined sidewall and the permanent magnet.

[0013] In particular, the trapezoidal cooling channel and embedded trapezoidal pipe achieve a large diameter and strong heat dissipation effect at the heat dissipation point, a small diameter at the receiving point, a fast water cooling medium flow rate, and a strong heat conduction effect. Furthermore, the trapezoidal shape helps the cooling water channel achieve more stable wall-mounted jet guidance under stator vibration conditions.

[0014] Furthermore, the stator assembly includes a stator core;

[0015] The sidewall of the stator core slopes inward from the outer circumference to form the inclined sidewall, and then extends parallel to the inner circumference to form the cooling channel between the two stator cores of two adjacent sets of stator assemblies and to clamp the permanent magnet.

[0016] In particular, by maintaining a constant cross-section magnetic circuit from the stator tooth tip to the air gap through the parallel extension section of the stator core, the magnetic permeability is kept constant, avoiding the diffusion of magnetic flux at the tooth tip caused by the inclined sidewall, and realizing the simple sliding assembly of the permanent magnet. The sidewall of the stator core does not radially fix the permanent magnet, avoiding interference in the cold assembly and jamming in the hot assembly of the permanent magnet.

[0017] Furthermore, the stator assembly also includes windings;

[0018] The inner peripheral wall of the stator core is recessed to form a winding slot that accommodates the winding. The outer peripheral side of the winding slot, away from the central axis, forms the inclined sidewall of the stator core, so that the cooling channel is located on the outer peripheral side of the winding.

[0019] In particular, by setting cooling channels for cooling and heat dissipation on the outer periphery of the winding slots of the stator core, the cooling channels avoid sacrificing the winding slot area, thus achieving efficient heat dissipation without affecting the winding wire diameter.

[0020] Furthermore, the radial wall thickness of the stator core is equal at the slot sidewall, slot bottomwall, and inclined sidewall of the winding slot.

[0021] Furthermore, six sets of cooling channels are symmetrically arranged along the central axis of the housing.

[0022] In particular, by ensuring uniform wall thickness of the stator core, the thermal resistance of the stator core is made uniform across the entire range, reducing the standard deviation of heat dissipation efficiency, achieving a lower circumferential temperature difference in the permanent magnet, eliminating the risk of local thermal stress cracks, improving lifespan, and achieving uniform magnetic circuit of the flux switching drive motor, thereby reducing torque fluctuations.

[0023] Furthermore, the inclined sidewall is made of silicon steel sheet material that is attached to the sidewall of the stator core.

[0024] In particular, silicon steel sheets have the characteristics of low thermal expansion coefficient and high fracture toughness. Therefore, silicon steel sheets further improve the heat dissipation and cooling efficiency of the stator core and ensure the impact resistance of the cooling water channel.

[0025] Furthermore, the flux-switching permanent magnet drive cooling system also includes a first heat dissipation channel wrapped around the outer periphery of the casing;

[0026] The first heat dissipation channel is connected in series with the cooling channel to perform coordinated heat dissipation of the casing and stator assembly.

[0027] In particular, it achieves temperature gradient difference between the casing and stator cooling zones to drive water-cooling medium convection, thereby improving heat dissipation efficiency.

[0028] Furthermore, the flux-switching permanent magnet drive cooling system also includes a second heat dissipation channel wrapped around the outer periphery of the casing;

[0029] The outer casing heat dissipation channel is connected in parallel with the cooling channel to perform multi-stage heat dissipation for the casing and stator assembly.

[0030] In particular, by connecting the heat dissipation channels of the casing in parallel with the cooling channels, a multi-segment composite heat dissipation mode is formed, which facilitates zoned cooling and fault isolation. For example, the sensitive area of ​​the permanent magnet is enhanced with cooling, and the casing channels are protected from overcooling and condensation.

[0031] Furthermore, the flux-switching permanent magnet drive cooling system also includes a third heat dissipation channel wrapped around the outer periphery of the casing;

[0032] The third heat dissipation channel and the cooling channel are respectively provided with independent inlets and outlets for independent local heat dissipation of the casing and stator assembly.

[0033] In particular, precise heat dissipation of the magnetic flux switching drive motor is achieved through dual independent water channels.

[0034] Furthermore, the outer periphery of the cooling water channel is fitted with a metal bushing, a corrosion-resistant alloy bushing, or a composite material bushing to maintain stability under stator vibration conditions.

[0035] Compared with the prior art, the beneficial effect of the present invention is that the end of the shrinkable cooling channel reaches the end face of the stator assembly directly, making the spacing extremely small, thereby achieving a surface cooling effect of the stator assembly. This avoids the problem of low heat dissipation efficiency and local overheating caused by insufficient cooling capacity of the outer periphery of the housing to the stator assembly, and significantly improves the heat dissipation effect of the flux switching drive motor.

[0036] In particular, the present invention achieves a large diameter and strong heat dissipation effect at the heat dissipation point and a small diameter, fast flow rate of water cooling medium and strong heat conduction effect at the receiving point through the trapezoidal cooling channel and embedded trapezoidal pipe. Moreover, the trapezoidal shape helps the cooling water channel to achieve more stable wall-mounted jet guidance under stator vibration conditions.

[0037] In particular, the present invention provides a cooling channel for cooling and heat dissipation on the outer periphery of the winding slot of the stator core, thereby avoiding the sacrifice of the winding slot area by the cooling channel and achieving efficient heat dissipation without affecting the winding wire diameter. Attached Figure Description

[0038] Figure 1 This is a front view schematic diagram of the flux switching permanent magnet drive cooling system for an irregular stator according to an embodiment of the present invention;

[0039] Figure 2 This is a partial front view of the flux-switching permanent magnet drive cooling system for an irregularly shaped stator according to an embodiment of the present invention.

[0040] Figure 3 This is a cross-sectional view of the flux-switching permanent magnet drive cooling system for an irregularly shaped stator according to an embodiment of the present invention.

[0041] Figure 4 This is a side view of the flux-switching permanent magnet drive cooling system for an irregularly shaped stator according to an embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of the ANSYS thermal simulation results of the flux-switching permanent magnet drive cooling system for the irregular stator according to an embodiment of the present invention.

[0043] Figure 6This is a schematic diagram of the ANSYS thermal simulation results of a conventional stator according to an embodiment of the present invention.

[0044] The main components in the diagram are: 1. Cooling channel; 2. Winding; 3. Stator core; 4. Housing; 5. Rotor; 6. Permanent magnet. Detailed Implementation

[0045] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0046] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] like Figures 1 to 6 As shown, the present invention provides a flux-switching permanent magnet drive cooling system for irregular stators. The end of the shrinkable cooling channel 1 reaches the end face of the stator assembly directly, making the spacing between them extremely small, thereby achieving a surface cooling effect for the stator assembly. This avoids the problem of low heat dissipation efficiency and local overheating caused by insufficient heat dissipation from the outer periphery of the housing 4 to the stator assembly, and significantly improves the heat dissipation effect of the flux-switching drive motor.

[0050] like Figure 1 and Figure 2 As shown, this embodiment proposes a flux-switching permanent magnet driven cooling system for irregularly shaped stators, comprising:

[0051] Casing 4;

[0052] The stator assembly is located inside the housing 4. There is a permanent magnet 6 between two adjacent sets of stator assemblies, and a cooling channel 1 formed at intervals from the housing 4. The circumferential diameter of the cooling channel 1 shrinks radially toward the central axis of the stator assembly to the end face of the permanent magnet 6.

[0053] A cooling water channel is provided through the cooling channel 1, and a water-cooling medium is introduced inside to cool and dissipate heat from the stator assembly and the permanent magnet 6.

[0054] The cooling channel 1 is trapezoidal in shape, and its circumferential inclined sidewalls are inclined and tapered from the housing 4 toward the permanent magnet 6.

[0055] The cooling water channel is a trapezoidal pipe that runs through and is embedded in the cooling channel 1, and contacts the inclined sidewall and the permanent magnet 6.

[0056] In particular, the trapezoidal cooling channel 1 and the embedded trapezoidal pipe achieve a large diameter and strong heat dissipation effect at the heat dissipation point, a small diameter at the receiving point, a fast water cooling medium flow rate, and a strong heat conduction effect. Furthermore, the trapezoidal shape helps the cooling water channel achieve more stable wall-mounted jet guidance under stator vibration conditions.

[0057] In this embodiment, the stator assembly includes a stator core 3;

[0058] The sidewall of the stator core 3 is inclined and contracted inward from the outer circumference to form the inclined sidewall, and then extends parallel to the inner circumference to form the cooling channel 1 between the two stator cores 3 of two adjacent sets of stator assemblies and to clamp the permanent magnet 6.

[0059] In particular, by maintaining the equal cross-section magnetic circuit from the stator tooth tip to the air gap through the parallel extension section of the stator core 3, the magnetic permeability is kept constant, avoiding the diffusion of magnetic flux at the tooth tip caused by the inclined sidewall, and realizing the simple sliding assembly of the permanent magnet 6. The sidewall of the stator core 3 does not radially fix the permanent magnet 6, avoiding interference in the cold assembly and jamming in the hot assembly of the permanent magnet.

[0060] In this embodiment, as Figure 3 As shown, the stator assembly also includes winding 2;

[0061] The inner peripheral wall of the stator core 3 is recessed to form a winding slot for accommodating the winding 2. The side wall of the stator core 3 on the outer peripheral side of the winding slot away from the central axis forms the inclined side wall, so that the cooling channel 1 is located on the outer peripheral side of the winding 2.

[0062] In particular, by providing cooling channels for cooling and heat dissipation on the outer periphery of the winding slots of the stator core 3, the cooling channel 1 avoids sacrificing the winding slot area, thus achieving efficient heat dissipation without affecting the winding wire diameter.

[0063] In this embodiment, as Figure 3 As shown, the radial wall thickness of the stator core 3 is equal at the slot sidewall, slot bottomwall, and inclined sidewall of the winding slot.

[0064] Furthermore, the cooling channels 1 are arranged symmetrically in 6 groups along the central axis of the housing 4.

[0065] In particular, by ensuring uniform wall thickness of the stator core 3, uniform thermal resistance across the entire stator core 3 is achieved, reducing the standard deviation of heat dissipation efficiency, resulting in a lower circumferential temperature difference in the permanent magnet 6, eliminating the risk of local thermal stress cracks, improving lifespan, achieving uniform magnetic circuit across the entire magnetic flux switching drive motor, and reducing torque fluctuations.

[0066] In this embodiment, the inclined sidewall is made of silicon steel sheet material that is attached to the sidewall of the stator core 3.

[0067] In particular, silicon steel sheets have the characteristics of low thermal expansion coefficient and high fracture toughness. Therefore, silicon steel sheets further enhance the heat dissipation and cooling efficiency of stator core 3 and ensure the impact resistance of cooling water channels.

[0068] As the first specific implementation of this embodiment, the flux switching permanent magnet drive cooling system of the irregular stator further includes a first heat dissipation channel wrapped around the outer periphery of the housing 4;

[0069] The first heat dissipation channel is connected in series with the cooling channel to perform coordinated heat dissipation of the housing 4 and the stator assembly.

[0070] In particular, it achieves temperature gradient difference between the casing and stator cooling zones to drive water-cooling medium convection, thereby improving heat dissipation efficiency.

[0071] As a second specific implementation of this embodiment, the flux switching permanent magnet drive cooling system of the irregular stator in this embodiment also includes a second heat dissipation channel wrapped around the outer periphery of the casing 4.

[0072] The outer casing heat dissipation channel is connected in parallel with the cooling channel to perform multi-stage heat dissipation of the casing 4 and the stator assembly.

[0073] In particular, by connecting the heat dissipation channels of the casing in parallel with the cooling channels, a multi-segment composite heat dissipation mode is formed, which facilitates zoned cooling and fault isolation. For example, the sensitive area of ​​the permanent magnet 6 is enhanced with cooling, and the casing channels are protected from overcooling and condensation.

[0074] As a third specific implementation of this embodiment, the flux switching permanent magnet drive cooling system of the irregular stator in this embodiment also includes a third heat dissipation channel wrapped around the outer periphery of the housing 4.

[0075] The third heat dissipation channel and the cooling channel are respectively provided with independent inlets and outlets for independent local heat dissipation of the casing 4 and the stator assembly.

[0076] In particular, precise heat dissipation of the magnetic flux switching drive motor is achieved through dual independent water channels.

[0077] In this embodiment, the outer periphery of the cooling water channel is fitted with a metal bushing, a corrosion-resistant alloy bushing, or a composite material bushing to maintain stability under stator vibration conditions.

[0078] It should be noted that the flux-switching permanent magnet drive cooling system for irregular stators described in this embodiment is applied to a flux-switching permanent magnet machine (FSPM).

[0079] Specifically, such as Figure 2 As shown, the stator core 3 is fixedly installed with the housing 4.

[0080] Specifically, such as Figure 3 As shown, the permanent magnet 6 is radially embedded into the stator core 3 at the bottom end of the self-cooling channel 1.

[0081] Specifically, such as Figure 4 As shown, the stator core 3 is axially protruding from the housing 4 and the rotor 5.

[0082] Specifically, such as Figure 5 and 6 The image shows the stator temperature graphs in ANSYS thermal simulations of the stator assembly in this embodiment and the conventional stator under steady-state conditions with an online current of 5A and an ambient temperature of 40 degrees Celsius. It can be seen that, compared to the conventional stator, the corresponding temperatures are as high as 394.4℃, 371℃, and 372℃ respectively, indicating severe irreversible demagnetization and the motor's inability to operate normally. In this embodiment, the highest temperatures of the stator core 3 are 53.3℃, ​​46.5℃, and 48.2℃, respectively. While the temperature of the stator core 3 in a conventional motor exceeds 300 degrees Celsius, the temperature in this embodiment is around 50 degrees Celsius, showing a significant temperature decrease. Therefore, this embodiment effectively avoids the risks of thermal runaway and demagnetization of the permanent magnet 6, significantly improving the reliability and service life of the motor.

[0083] This embodiment improves the stator structure and cooling method by placing the water channel directly above the permanent magnet 6 and in close contact with the permanent magnet 6 and the stator core 3. Because the improved cooling medium can directly act on the main heat source area, the heat conduction path is significantly shortened, greatly improving heat dissipation efficiency and thus better controlling the motor operating temperature.

[0084] Specifically, the stator of the flux switching motor (FSPM) is designed with a "plum blossom" shape, with a trapezoidal water channel directly above the permanent magnet 6, making close contact with the permanent magnet 6 and the stator core 3. Through this design, the water cooling medium can be brought as close as possible to the main heat-generating components and the contact surface between the permanent magnet 6 and the stator core 3, reducing the heat transfer path and thermal resistance, and significantly improving heat dissipation efficiency.

[0085] Specifically, in this embodiment, the water channel is moved from the traditional housing 4 or outer shell to the vicinity of the permanent magnet 6 and the stator core 3. This not only avoids the heat dissipation bottleneck caused by the poor thermal conductivity of the housing 4 material (such as aluminum or steel), but also eliminates the need to sacrifice the winding slot area to arrange the water channel, thus achieving efficient heat dissipation without affecting the stator winding wire diameter.

[0086] In this embodiment, the stator core 3 is shaped like a "plum blossom" or petal, with segmented protrusions on the periphery to provide sufficient installation space for the permanent magnet 6 and water channels on the outer periphery of the stator assembly. Compared to a conventional annular stator, the "plum blossom" structure creates a naturally usable cavity above the permanent magnet 6 for arranging water-cooling channels. Each "petal" unit corresponds to a permanent magnet 6 region and a corresponding cooling channel 1, resulting in more targeted cooling and higher heat exchange efficiency. Furthermore, the "plum blossom" distribution allows for structural parameter optimization based on magnetic circuit requirements, simultaneously considering electromagnetic performance and mechanical strength to achieve a globally optimized design.

[0087] Unlike traditional solutions that involve slotting in the housing 4 or designing cooling channels 1 at the ends of the windings 2, this embodiment places the water channels directly above the permanent magnets 6 and integrates them with the stator core 3 to form a unified heat dissipation design. This design offers advantages such as a short heat conduction path and low thermal resistance, quickly dissipating the heat generated by the permanent magnets 6 and the stator core 3. This results in superior thermal management performance and reduces the risk of material demagnetization and performance degradation due to overheating. Furthermore, there is no need to compress the stator slot size by increasing the water channel space, allowing the wire diameter and number of turns of the stator windings 2 to remain essentially unchanged.

[0088] Based on the stator design of this embodiment, a complete annular water channel can be set on the outer periphery of the stator or the outer edge of the permanent magnet 6, or an independent local cooling channel 1 can be set above each pair of permanent magnets 6 to form a multi-segment heat dissipation layout. Multi-segment water channels facilitate zoned cooling and fault isolation, while a single annular water channel is simpler to process and maintain.

[0089] The inlet and outlet of the cooling water channel can be integrated into the end cap or axially extending pipe to simplify the overall structure. The cooling water channel section can use metal bushings, corrosion-resistant alloys, or composite materials to enhance durability and temperature resistance. Meanwhile, sealing rings, sealants, or welding processes ensure that the water channel does not leak and remains stable under high-speed motor rotation or vibration conditions.

[0090] In this embodiment, the end of the contraction-type cooling channel 1 reaches directly to the end face of the stator assembly, making the spacing extremely small, thus achieving a surface cooling effect for the stator assembly. This avoids the problems of low heat dissipation efficiency and localized overheating caused by insufficient cooling capacity of the outer periphery of the housing 4 to the stator assembly, significantly improving the heat dissipation effect of the flux switching drive motor. The trapezoidal cooling channel 1 and the embedded trapezoidal pipe achieve a large diameter and strong heat dissipation effect at the heat dissipation point, and a small diameter, fast water-cooling medium flow rate, and strong thermal conductivity at the receiving point. Furthermore, the trapezoidal shape helps to achieve more stable wall-mounted jet flow guidance in the cooling water channel under stator vibration conditions. By setting a cooling channel for heat dissipation on the outer periphery of the winding slots of the stator core 3, the cooling channel 1 avoids sacrificing the winding slot area, achieving efficient heat dissipation without affecting the winding wire diameter.

[0091] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flux-switching permanent magnet driven cooling system for an irregularly shaped stator, characterized in that, include: Casing (4); The stator assembly is located inside the housing (4). There is a permanent magnet (6) between two adjacent stator assemblies and a cooling channel (1) formed at intervals from the housing (4). The circumferential diameter of the cooling channel (1) shrinks towards the central axis along the radial direction of the stator assembly to the end face of the permanent magnet (6). A cooling water channel is provided through the cooling channel (1) and a water-cooling medium is introduced inside to cool and dissipate heat from the stator assembly and the permanent magnet (6). The cooling channel (1) is trapezoidal in shape, and its circumferential inclined sidewalls are inclined and tapered from the housing (4) toward the permanent magnet (6); The cooling water channel is a trapezoidal pipe that runs through and is embedded in the cooling channel (1), and contacts the inclined sidewall and the permanent magnet (6).

2. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 1, characterized in that, The stator assembly includes a stator core (3); The sidewall of the stator core (3) is inclined and contracted inward from the outer circumference to form the inclined sidewall, and then extends parallel to the inner circumference to form the cooling channel (1) between the two stator cores (3) of the two adjacent sets of stator assemblies and to clamp the permanent magnet (6).

3. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 2, characterized in that, The stator assembly also includes windings (2); The inner peripheral wall of the stator core (3) is recessed to form a winding slot for accommodating the winding (2), and the side wall of the stator core (3) on the outer peripheral side of the winding slot away from the central axis forms the inclined side wall, so that the cooling channel (1) is located on the outer peripheral side of the winding (2).

4. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 3, characterized in that, The radial wall thickness of the stator core (3) is equal at the slot sidewall, slot bottomwall and inclined sidewall of the winding slot.

5. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 1, characterized in that, The cooling channels (1) are arranged symmetrically in 6 groups along the central axis of the casing (4).

6. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 2, characterized in that, The inclined sidewall is made of silicon steel sheet that is attached to the sidewall of the stator core (3).

7. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 1, characterized in that, It also includes a first heat dissipation channel wrapped around the outer periphery of the housing (4); The first heat dissipation channel is connected in series with the cooling channel to perform coordinated heat dissipation of the casing (4) and the stator assembly.

8. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 1, characterized in that, It also includes a second heat dissipation channel wrapped around the outer periphery of the casing (4); The heat dissipation channel of the casing is connected in parallel with the cooling channel to perform multi-stage heat dissipation of the casing (4) and the stator assembly.

9. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to claim 1, characterized in that, It also includes a third heat dissipation channel wrapped around the outer periphery of the casing (4); The third heat dissipation channel and the cooling channel are respectively provided with independent inlets and outlets for independent local heat dissipation of the casing (4) and stator assembly.

10. The flux-switching permanent magnet drive cooling system for irregularly shaped stators according to any one of claims 1 to 9, characterized in that, The outer periphery of the cooling water channel is fitted with a metal bushing, a corrosion-resistant alloy bushing, or a composite material bushing to maintain stability under stator vibration conditions.

Images