Phase change heat dissipation motor stator based on flat wire winding

Abstract

The invention belongs to the technical field of motor stator winding preparation, and particularly relates to a phase change heat dissipation motor stator based on a flat wire winding. A traditional round wire motor winding is changed into a flat wire winding with a rectangular enameled wire section, a flat wire motor stator comprises a phase change heat dissipation shell, trapezoidal protrusions extending in the axial direction are distributed on the bottom face of the phase change heat dissipation shell along the circumference, and the number of the trapezoidal protrusions is the same as that of stator winding grooves; after the flat wire stator is axially arranged in the phase change heat dissipation shell, each trapezoidal bulge is respectively inserted into each groove of the flat wire stator winding; after the phase change heat dissipation shell and the flat wire stator winding are assembled, the phase change heat dissipation shell and the flat wire stator winding are encapsulated into a whole through heat conduction pouring sealant. Trapezoidal cavities are formed in the trapezoidal protrusions of the phase change heat dissipation shell, the cavities are filled with a phase change material 1, a certain number of fan-shaped cavities are distributed in the outer portion of the phase change heat dissipation shell along the circumference, and the fan-shaped cavities are filled with another phase change material II; the phase change material absorbs heat, and the effect of inhibiting temperature rise is achieved.

Description

A phase change heat dissipation motor stator based on flat wire windings Technical Field

[0001] This invention belongs to the field of motor stator winding preparation technology, specifically relating to a phase change heat dissipation motor stator based on flat wire windings. Background Technology

[0002] Existing permanent magnet synchronous motors for electric actuators typically employ natural heat dissipation for cooling. However, the motor materials have poor thermal conductivity and heat storage capacity. The motor windings often use round wire windings, and the enameled wires are not tightly bonded and are unevenly distributed within the slots. Although the enameled wires fill the entire slot, the pure copper conductor slot fill factor is only about 30%. This low slot fill factor leads to high stator winding resistance, resulting in greater losses and heat generation under the same operating conditions. The uneven distribution of the enameled wires within the slots also results in low space utilization, preventing the copper conductors from conducting heat and causing rapid temperature rise. In electro-hydraulic actuator motors, the stator winding temperature rises rapidly at high torque operating points. The lack of heat absorption structures around the windings and on the motor casing means that excessive heat accumulation in the slots will cause the enameled wires to overheat, damaging the insulation and leading to motor failure. Summary of the Invention

[0003] Purpose of the invention: To provide a phase change heat dissipation motor stator based on flat wire windings, which solves the problems of low slot fill factor, high copper loss, low heat transfer efficiency, and high temperature rise in existing motor stator windings.

[0004] Technical solution: A phase change heat dissipation motor stator based on flat wire winding, comprising: flat wire stator winding 1, phase change heat dissipation shell 2, coil 3, stator tooth 4, enameled wire 5, trapezoidal gap 6, outer wall 7, bottom surface 8, trapezoidal protrusion 9, thermally conductive potting compound 10, trapezoidal cavity 11, fan-shaped cavity 13, phase change material I 13, phase change material II 14, trapezoidal protrusion cavity injection hole 15, fan-shaped cavity injection hole 16, plug I 17, plug II 18; wherein, the coil 3 is wound around each stator tooth 4, individually The coils 3 on the stator teeth are arranged in no less than 3 layers radially along the stator teeth 4, and can be arranged in 1 layer or more circumferentially. The coils on different stator teeth 4 are connected end to end to form a motor winding. The coil on a single stator tooth 4 is wound with a single flat wire. The distribution pattern of the coils in the slot is that the number of layers at the slot opening and bottom is small, and the number of layers in the middle of the slot is large, or the number of layers at the slot opening and bottom is the same as the number of layers in the middle of the slot. With this stator structure, axially penetrating trapezoidal gaps 6 will appear near the center of the slot. The number of trapezoidal gaps 6 is equal to the number of teeth. Phase change heat dissipation The shell 2 includes an outer wall 7 and a bottom surface 8. Trapezoidal protrusions 9 are distributed circumferentially along the bottom surface 8, and the number of trapezoidal protrusions is the same as the number of slots in the stator winding. After the flat wire stator winding 1 is axially installed into the phase change heat dissipation shell 2, each trapezoidal protrusion 9 is inserted into each slot of the flat wire stator winding 1. After the phase change heat dissipation shell 2 and the flat wire stator winding 1 are assembled, they are encapsulated together using thermally conductive potting compound 10. The trapezoidal protrusion 9 has a trapezoidal cavity 11 inside, which is filled with phase change material I 12. The two sides of the trapezoidal protrusion 9 are close to The near-flat wire winding, with the assistance of thermally conductive potting compound, quickly absorbs the heat of the winding; a certain number of fan-shaped cavities 13 are distributed around the circumference of the phase change heat dissipation shell 2, and the number of fan-shaped cavities 13 is arranged alternately with the trapezoidal protrusions 11 on the bottom surface; another phase change material II 14 is filled in the fan-shaped cavities 13; trapezoidal protrusion cavity injection holes 15 and fan-shaped cavity injection holes 16 are respectively opened on the outer side of the bottom surface of the phase change heat dissipation shell 2; after filling, plugs I 17 and plugs II 18 are used to seal the injection holes respectively.

[0005] Furthermore, the stator tooth 4 is rectangular in shape.

[0006] Furthermore, the phase change heat dissipation shell 2 is made of aluminum alloy.

[0007] Furthermore, the enameled wire 5 used in coil 3 has a rectangular cross-section.

[0008] Furthermore, the trapezoidal protrusion 9 of the phase change heat dissipation shell 2 is the same part as the phase change heat dissipation shell 2, or it is processed separately and then assembled into one piece.

[0009] Furthermore, after the phase change heat dissipation shell 2 and the flat wire stator winding 1 are assembled, they are encapsulated together using thermally conductive potting compound 10. The height of the potting compound is flush with the end of the flat wire stator winding to improve the heat transfer effect.

[0010] Furthermore, the phase change temperature of phase change material I12 is determined based on the heat generated by the winding operation and the temperature rise of the enameled wire; the two sides of the trapezoidal protrusion 9 are close to the flat wire winding, and at the same time, they rely on the thermally conductive potting compound to quickly absorb the heat of the winding. After the phase change material absorbs heat to a certain limit, it undergoes a phase change and further absorbs a large amount of heat, thereby achieving the effect of suppressing the rise of the winding temperature.

[0011] Furthermore, the phase change temperature of phase change material II14 is determined based on the heat generated by the motor during operation and the temperature rise of the casing. The phase change material absorbs the heat transferred from the casing, and after absorbing heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat to achieve the effect of suppressing the temperature rise of the casing.

[0012] Furthermore, the trapezoidal protrusion cavity injection hole 15 and the fan-shaped cavity injection hole 16 are used to fill the cavity of the phase change heat dissipation shell with phase change material.

[0013] Furthermore, welding is used to connect plug I17 and plug II18 to the phase change heat dissipation shell 2, thereby sealing the phase change material inside the shell.

[0014] Beneficial Effects: This invention provides a flat wire motor stator for a permanent magnet synchronous motor. It replaces the traditional round wire motor winding with a flat wire winding of rectangular enameled wire. The stator teeth are rectangular in shape, and the winding coils are wound around the stator teeth. The winding on a single stator tooth has at least three layers radially and at least one layer circumferentially. The coils on different stator teeth are connected end-to-end to form the motor stator winding. Each stator tooth's coil is wound with a single flat wire. The circumferential multi-layer flat wire windings are distributed in the slots with fewer layers at the slot opening and bottom, and more layers in the middle, or the number of layers at the slot opening and bottom is the same as the number of layers in the middle. A trapezoidal gap appears near the center of the slot in this stator structure. The flat wire motor stator includes a phase-change heat dissipation shell with axially extending trapezoidal protrusions distributed circumferentially on its bottom surface. The number of trapezoidal protrusions is the same as the number of stator winding slots. After the flat wire stator is axially inserted into the phase-change heat dissipation shell, each trapezoidal protrusion is inserted into each slot of the flat wire stator winding. After the phase change heat sink housing and the flat wire stator winding are assembled, they are encapsulated together using thermally conductive potting compound. The trapezoidal protrusions of the phase change heat sink housing contain trapezoidal cavities filled with phase change material 1. The phase change temperature of the phase change material is determined based on the heat generated by the winding and the temperature rise of the enameled wire. The two sides of the trapezoidal protrusions are close to the flat wire winding, and with the assistance of the thermally conductive potting compound, they quickly absorb heat from the winding. After the phase change material absorbs heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat, thus suppressing the temperature rise of the winding. A certain number of fan-shaped cavities are distributed circumferentially on the outside of the phase change heat sink housing, spaced apart from the trapezoidal protrusions on the bottom surface. These fan-shaped cavities are filled with another phase change material II. The phase change temperature of this material is determined based on the heat generated by the motor during operation and the temperature rise of the housing. This phase change material absorbs heat transferred from the housing, and after absorbing heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat, thus suppressing the temperature rise of the housing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a stator structure diagram of a flat wire winding phase change heat dissipation motor according to the first embodiment of the present invention; Figure 2 is a schematic diagram of the flat wire winding structure according to the first embodiment of the present invention; Figure 3 is a schematic diagram of the phase change heat dissipation shell structure according to the first embodiment of the present invention; Figure 4 is a schematic diagram of the internal cavity of the phase change heat dissipation shell according to the first embodiment of the present invention; Figure 5 is a schematic diagram of the assembly of the plug and the heat dissipation shell according to the first embodiment of the present invention.

[0017] Figure 6 is a stator structure diagram of a flat wire winding phase change heat dissipation motor according to the second embodiment of the present invention; Figure 7 is a schematic diagram of a flat wire winding structure according to the second embodiment of the present invention; Figure 8 is a schematic diagram of a phase change heat dissipation housing structure according to the second embodiment of the present invention; Figure 9 is a schematic diagram of the internal cavity of the phase change heat dissipation housing according to the second embodiment of the present invention; Figure 10 is a schematic diagram of the assembly of the plug and the heat dissipation housing according to the second embodiment of the present invention.

[0018] Explanation of reference numerals in the attached diagram: 1-Flat wire stator winding; 2-Phase change heat dissipation shell; 3-Coil; 4-Stator tooth; 5-Enameled wire; 6-Trapezoidal gap; 7-Outer wall; 8-Bottom surface; 9-Trapezoidal protrusion; 10-Thermal conductive potting compound; 11-Trapezoidal cavity; 13-Fan-shaped cavity; 12-Phase change material I; 14-Phase change material II; 15-Trapezoidal protrusion cavity injection hole; 16-Fan-shaped cavity injection hole; 17-Plug I; 18-Plug II. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0021] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] The structure of the flat wire winding phase change heat dissipation motor stator provided by the present invention will be explained below with reference to the accompanying drawings.

[0025] Figure 1 is a structural diagram of the stator of the phase-change heat dissipation motor with flat wire winding provided by the present invention. Referring to Figure 1, the present invention provides a stator of a phase-change heat dissipation motor based on flat wire winding, including a flat wire stator winding 1 and a phase-change heat dissipation shell 2. The flat wire coil 3 is wound on each tooth, the two sides of the stator tooth 4 are parallel, and the enameled wire 5 is a flat wire with a rectangular cross-section. The winding on a single stator tooth is distributed in at least 3 layers along the stator radial direction and at least 1 layer along the circumferential direction. This stator structure improves the stator slot fill factor compared to a round wire motor, reduces copper losses during motor operation, and improves the adhesion between the enameled wires in the slot, reducing the gaps between the enameled wires and thus improving heat conduction. Furthermore, the flat wire coil on a single stator tooth is wound with a single flat wire. The circumferential multi-layer flat wire winding is distributed in the slot with fewer layers at the slot opening and bottom, and more layers in the middle of the slot, or the number of layers at the slot opening and bottom is the same as the number of layers in the middle of the slot. Near the center of the slot using this stator structure, a near-trapezoidal gap 6 appears, and the number of trapezoidal gaps is equal to the number of slots.

[0026] The phase change heat sink housing 2 includes an outer wall 7 and a bottom surface 8. Trapezoidal protrusions 9 extending axially are distributed along the circumference of the bottom surface 8, the number of which is the same as the number of slots in the stator winding. The trapezoidal protrusions 9 can be the same part as the phase change heat sink housing 2, or they can be manufactured separately and then assembled. After the flat wire stator winding 1 is axially inserted into the phase change heat sink housing 2, each trapezoidal protrusion 9 is inserted into each slot of the flat wire stator winding 1. After the phase change heat sink housing 2 and the flat wire stator winding 1 are assembled, they are encapsulated together using thermally conductive potting compound 10. The height of the potting compound is flush with the end of the flat wire stator winding to improve heat transfer.

[0027] The phase change heat dissipation housing 2 can be made of aluminum alloy. The trapezoidal protrusion 9 has a trapezoidal cavity 11 inside, filled with a phase change material 112. The phase change temperature of the phase change material is determined based on the heat generated by the winding operation and the temperature rise of the enameled wire. The two sides of the trapezoidal protrusion 9 are close to the flat wire winding, and with the assistance of thermally conductive potting compound, they quickly absorb the heat from the winding. After the phase change material absorbs heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat, thereby suppressing the temperature rise of the winding. A certain number of fan-shaped cavities 12 are distributed circumferentially on the outside of the phase change heat dissipation housing 2, with the number of fan-shaped cavities 12 alternating with the number of trapezoidal protrusions 11 on the bottom surface. The fan-shaped cavities 13 are filled with another phase change material II 14. The phase change temperature of this phase change material is determined based on the heat generated by the motor operation and the temperature rise of the housing. This phase change material absorbs the heat transferred from the housing, and after absorbing heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat, thereby suppressing the temperature rise of the housing.

[0028] The outer side of the bottom surface of the phase change heat sink housing 2 has trapezoidal protruding cavity injection holes 15 and fan-shaped cavity injection holes 16, which are used to fill the cavities of the phase change heat sink housing with phase change material. After filling, plugs I 17 and II 18 are used to seal the injection holes. The plugs can be connected to the phase change heat sink housing 2 by welding to achieve the sealing of the phase change material inside the housing.

[0029] This invention provides a flat wire motor stator for a permanent magnet synchronous motor. It replaces the traditional round wire motor winding with a flat wire winding using enameled wire with a rectangular cross-section. The stator teeth are rectangular in shape, and the winding coils are wound around the stator teeth. Each stator tooth has at least three layers of winding along the stator radial direction and at least one layer along the circumference. The coils on different stator teeth are connected end-to-end to form the motor stator winding. Each stator tooth's coil is wound using a single flat wire. The circumferential multi-layer flat wire windings are distributed in the slots with fewer layers at the slot opening and bottom, and more layers in the middle, or the number of layers at the slot opening and bottom is the same as the number of layers in the middle. A trapezoidal gap appears near the center of the slot in this stator structure. The flat wire motor stator includes a phase-change heat dissipation shell with axially extending trapezoidal protrusions distributed circumferentially on its bottom surface. The number of trapezoidal protrusions is the same as the number of stator winding slots. After the flat wire stator is axially inserted into the phase-change heat dissipation shell, each trapezoidal protrusion is inserted into each slot of the flat wire stator winding. After the phase change heat sink housing and the flat wire stator winding are assembled, they are encapsulated together using thermally conductive potting compound. The trapezoidal protrusions of the phase change heat sink housing contain trapezoidal cavities filled with phase change material 1. The phase change temperature of the phase change material is determined based on the heat generated by the winding and the temperature rise of the enameled wire. The two sides of the trapezoidal protrusions are close to the flat wire winding, and with the assistance of the thermally conductive potting compound, they quickly absorb heat from the winding. After the phase change material absorbs heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat, thus suppressing the temperature rise of the winding. A certain number of fan-shaped cavities are distributed circumferentially on the outside of the phase change heat sink housing, spaced apart from the trapezoidal protrusions on the bottom surface. These fan-shaped cavities are filled with another phase change material II. The phase change temperature of this material is determined based on the heat generated by the motor during operation and the temperature rise of the housing. This phase change material absorbs heat transferred from the housing, and after absorbing heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat, thus suppressing the temperature rise of the housing.

[0030] Example 1: In specific Example 1, see Figures 1 to 5. The flat wire winding phase change heat dissipation motor stator provided by the present invention includes: 1. A flat wire stator winding with 9 teeth on its circumference, the rectangular teeth being 12mm long and 5mm wide.

[0031] 2. The cross-section of the enameled wire used in the flat wire winding is 2mm × 2.5mm.

[0032] 3. The flat wire winding is distributed in 5 layers along the radial direction of the stator teeth.

[0033] 4. The flat wire winding is distributed in one layer along the circumference of the slot.

[0034] 5. The flat wire winding is distributed in one layer in the middle of the slot.

[0035] 6. The flat wire winding is distributed in one layer along the circumferential direction at the bottom of the slot.

[0036] 7. The flat wire winding achieves a slot fill factor of approximately 39% in pure copper slots, which is about 0.3 times higher than that of the round copper wire winding.

[0037] 8. The stator slots of the flat wire motor have significant through axial clearance.

[0038] 9. The phase change heat dissipation housing has an outer diameter of 65mm and a wall thickness of 5.5mm.

[0039] 10. The bottom surface of the phase change heat sink housing has 9 trapezoidal protrusions, with a long side of 5.5mm, a short side of 3mm, and a height of 5mm.

[0040] 11. The trapezoidal protrusion is an integral part of the outer shell. The internal cavity of the trapezoidal protrusion has a long side of 4.5mm, a short side of 2mm, and a height of 4mm.

[0041] 12. The trapezoidal protrusions are filled with paraffin wax, with a thermal conductivity of 4 W / mK and an enthalpy of 200 J / g.

[0042] 13. Nine sector-shaped cavities are opened on the outer wall of the trapezoid, with an outer diameter of 65mm, an inner diameter of 56mm, and a sector angle of 30°.

[0043] 14. The sector-shaped cavity is filled with liquid metal with a thermal conductivity of 20 W / mK and an enthalpy of 20 J / g.

[0044] 15. The bottom surface of the phase change heat dissipation shell is welded to the trapezoidal plug and the fan-shaped plug respectively to achieve a seal.

[0045] Example 2: In specific Example 2, see Figures 6 to 10. The flat wire motor stator for electro-hydraulic actuators provided by the present invention includes: 1. Three teeth on the circumference of the flat wire stator winding, the rectangular teeth being 8mm long and 6.4mm wide.

[0046] 2. The cross-section of the enameled wire used in the flat wire winding is 1mm × 0.5mm.

[0047] 3. The flat wire winding is distributed in 11 layers along the radial direction of the stator teeth.

[0048] 4. The flat wire windings are distributed in 3 layers along the circumference of the slot.

[0049] 5. The flat wire winding is distributed in 4 layers in the middle layer of the slot.

[0050] 6. Flat wire windings are distributed in 2 to 3 layers along the circumference at the bottom of the slot.

[0051] 7. The flat wire winding achieves a slot fill factor of approximately 36% in pure copper slots, which is about 0.2 times higher than that of the round copper wire winding.

[0052] 8. The stator slots of the flat wire motor have significant through axial clearance.

[0053] 9. The phase change heat dissipation shell has an outer diameter of 42mm and a wall thickness of 5mm.

[0054] 10. The bottom surface of the phase change heat sink housing has three fan-shaped protrusions, with the long arc side length being 14mm, the short arc side length being 4.5mm, and the height being 5mm.

[0055] 11. The trapezoidal protrusion is an integral part of the outer shell. The long arc side of the internal cavity of the trapezoidal protrusion is 12.5mm long, the short arc side is 3.5mm long, and the height is 3.6mm.

[0056] 12. The trapezoidal protrusions are filled with paraffin wax, with a thermal conductivity of 4.5 W / mK and an enthalpy of 200 J / g.

[0057] 13. Three fan-shaped cavities are opened on the outer wall of the trapezoid, with an outer diameter of 40mm, an inner diameter of 33.5mm, and a fan angle of 60°.

[0058] 14. The sector-shaped cavity is filled with liquid metal with a thermal conductivity of 20 W / mK and an enthalpy of 20 J / g.

[0059] 15. The bottom surface of the phase change heat dissipation shell is welded to the small fan-shaped plug and the large fan-shaped plug respectively to achieve a seal.

[0060] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A phase-change heat dissipation motor stator based on flat wire windings, characterized in that, include: The components include a flat wire stator winding, a phase change heat dissipation shell, coils, stator teeth, enameled wire, trapezoidal gaps, an outer wall, a bottom surface, trapezoidal protrusions, thermally conductive potting compound, trapezoidal cavities, fan-shaped cavities, phase change material I, phase change material II, injection holes for trapezoidal protrusion cavities, injection holes for fan-shaped cavities, plug I, and plug II. The coils are wound around each stator tooth, with at least three layers arranged radially along a single stator tooth and one or more layers arranged circumferentially. The coils on different stator teeth are connected end-to-end to form a motor winding. Each stator tooth uses a single flat wire for winding. The coil distribution within the slot follows a pattern of fewer layers at the slot opening and bottom, and more layers in the middle of the slot, or the same number of layers at the slot opening and bottom as in the middle. This stator structure results in axially continuous trapezoidal gaps near the center of the slot, with the number of trapezoidal gaps equal to the number of teeth. The phase change heat dissipation shell includes an outer wall and a bottom surface. Trapezoidal protrusions extending axially are distributed along the upper circumference, with the number of protrusions matching the number of slots in the stator winding. After the flat wire stator winding is axially inserted into the phase change heat sink housing, each trapezoidal protrusion is inserted into each slot of the flat wire stator winding. After the phase change heat sink housing and the flat wire stator winding are assembled, they are encapsulated together using thermally conductive potting compound. The trapezoidal protrusions have trapezoidal cavities inside, filled with phase change material I. The two sides of the trapezoidal protrusions are close to the flat wire winding, and the thermally conductive potting compound helps to quickly absorb the heat from the winding. A certain number of fan-shaped cavities are distributed circumferentially on the outside of the phase change heat sink housing, with the number of fan-shaped cavities alternating with the number of trapezoidal protrusions on the bottom surface. Another phase change material II is filled in the fan-shaped cavities. Injection holes for the trapezoidal protrusion cavities and fan-shaped cavities are opened on the outer side of the bottom surface of the phase change heat sink housing. After filling, plugs I and II are used to seal the injection holes.

2. The phase-change heat dissipation motor stator according to claim 1, characterized in that, The stator teeth are rectangular in shape.

3. The phase-change heat dissipation motor stator according to claim 1, characterized in that, The phase change heat sink casing is made of aluminum alloy.

4. The phase-change heat dissipation motor stator according to claim 1, characterized in that, The enameled wire used for the coil has a rectangular cross-section.

5. The phase-change heat dissipation motor stator according to claim 1, characterized in that, The trapezoidal protrusions of the phase change heat sink casing are the same part as the phase change heat sink casing, or they are processed separately and then assembled into one piece.

6. The phase-change heat dissipation motor stator according to claim 1, characterized in that, After the phase change heat sink housing and the flat wire stator winding are assembled, thermally conductive potting compound is used to encapsulate the two into one piece. The height of the potting compound is flush with the end of the flat wire stator winding to improve the heat transfer effect.

7. The phase-change heat dissipation motor stator according to claim 1, characterized in that, The phase change temperature of phase change material I is determined based on the heat generated by the winding operation and the temperature rise of the enameled wire. The trapezoidal protrusions are close to the flat wire winding on both sides, and with the assistance of the thermally conductive potting compound, they quickly absorb the heat of the winding. After the phase change material absorbs heat to a certain limit, it undergoes a phase change and further absorbs a large amount of heat, thereby achieving the effect of suppressing the rise of the winding temperature.

8. The phase-change heat dissipation motor stator according to claim 1, characterized in that, The phase change temperature of phase change material II is determined based on the heat generated by the motor during operation and the temperature rise of the casing. The phase change material absorbs the heat transferred from the casing, and after absorbing heat to a certain limit, it undergoes a phase change, further absorbing a large amount of heat to achieve the effect of suppressing the temperature rise of the casing.

9. The phase-change heat dissipation motor stator according to claim 1, characterized in that, Trapezoidal protruding cavity injection holes and fan-shaped cavity injection holes are used to fill the cavities of the phase change heat dissipation shell with phase change material.

10. The phase-change heat dissipation motor stator according to claim 1, characterized in that, Welding is used to connect plug I and plug II to the phase change heat dissipation shell, thereby sealing the phase change material inside the shell.

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