Motor heat dissipation structure and axial flux motor

Abstract

The present invention relates to the technical field of axial flux motors. Disclosed are a motor heat dissipation structure and an axial flux motor. The motor heat dissipation structure comprises: a heat conduction member and a cooling system; the heat conduction member is configured to be arranged in a cavity of a motor housing where a heating element of the motor is located and fitted to the heating element of the motor so as to transmit heat of the heating element; and the cooling system is configured to be arranged on the outer side of the cavity of the motor housing where the heating element is located, and the heat conduction member is communicated with the cooling system so as to discharge heat transmitted by the heat conduction member. According to the motor heat dissipation structure provided in the present invention, the cooling system is arranged on the outer side of the cavity of the motor housing and is fitted to the heating element of the motor by means of the heat conduction member, so that heat generated by the heating element is transmitted to the cooling system on the outer side of the cavity, and the heat dissipation efficiency of the motor is improved while the axial space of the motor occupied by the heat dissipation structure is reduced. In addition, compared with a traditional complex water channel arranged in the motor housing, the structure is simple, and the preparation costs are low.

Description

Motor heat dissipation structure and axial flux motor

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 15, 2023, with application number 202311525067.2 and invention name “A motor heat dissipation structure and axial flux motor”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of axial flux motors, and more particularly to a motor heat dissipation structure and an axial flux motor. Background Art

[0003] A motor typically consists of an iron core and windings, as shown in Figures 3 and 4. During motor operation, a significant amount of heat is generated internally, with the majority of this heat being generated by the windings, causing them to heat up. Excessive winding temperatures can damage the insulation layer on the winding surface, causing short circuits between the copper wires and potentially burning the motor. The permanent magnets on the rotor also generate some heat, which, when excessively hot, can demagnetize and reduce motor performance.

[0004] In the existing technology, the cooling water channel of the motor is generally arranged inside the motor housing. The heat on the winding of the main heating element needs to be transferred to the water channel of the motor housing through the iron core for heat dissipation. However, the outstanding feature of the axial flux motor is that the axial dimension is small. When a water channel is set inside the motor housing, it will occupy the axial space of the motor, making the axial dimension larger, weakening the advantages of the axial flux motor. In addition, since the form of the water channel is relatively complex, the flow resistance increases, the energy consumption of the water pump increases, and the efficiency of the heat dissipation system is reduced.

[0005] In addition, the complex water channels also increase the difficulty of manufacturing the motor housing and increase the cost of the motor.

[0006] Therefore, how to improve the heat dissipation efficiency of the motor has become a technical problem that needs to be solved urgently by those skilled in the art.

[0007] Summary of the Invention

[0008] In view of this, an object of the present invention is to provide a motor heat dissipation structure to improve the heat dissipation efficiency of the motor.

[0009] Another object of the present invention is to provide an axial flux motor having the above motor heat dissipation structure.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A motor heat dissipation structure, comprising:

[0012] A heat conducting member is provided in a cavity of a motor housing where a heating element of the motor is located, and the heat conducting member is in contact with the heating element of the motor to transfer heat from the heating element;

[0013] The cooling system is used to be arranged outside the cavity of the motor housing where the heating element is located. The heat conducting member is connected to the cooling system to discharge the heat transferred by the heat conducting member.

[0014] Optionally, in the above motor heat dissipation structure, there are multiple heat conducting members, and each heat conducting member is distributed in a ring shape in the motor housing, and the heat conducting members are arranged at equal intervals.

[0015] Optionally, in the above-mentioned motor heat dissipation structure, the heat conductor is a split structure, and the heat conductor includes a first split part and a second split part that are symmetrically arranged, and the first split part and the second split part are arranged around the rotating axis of the motor housing to form a ring-shaped distributed heat conductor.

[0016] Optionally, in the above-mentioned motor heat dissipation structure, the cooling system includes a first heat dissipation fin and a liquid storage chamber for holding coolant, the first heat dissipation fin is arranged in the liquid storage chamber, and the heat conductor is connected to the first heat dissipation fin so that the first heat dissipation fin can discharge the heat of the heating element.

[0017] Optionally, in the above-mentioned motor heat dissipation structure, a liquid inlet and a liquid outlet are provided on the liquid storage chamber, and the liquid inlet and the liquid outlet are respectively used to communicate with a liquid supply device, so that the liquid supply device and the liquid storage chamber form a cooling circulation system.

[0018] Optionally, in the above-mentioned motor heat dissipation structure, the liquid storage chamber and the motor housing are an integrated structure, and a sealing partition is provided between the liquid storage chamber and the inside of the motor housing, and a mounting hole for the heat conductor to pass through is provided on the sealing partition, and the heat conductor is sealed and connected to the mounting hole.

[0019] Optionally, in the above motor heat dissipation structure, the cooling system includes a second heat dissipation fin arranged outside the cavity of the motor housing, and the heat conducting member is connected to the second heat dissipation fin.

[0020] Optionally, in the above motor heat dissipation structure, a heat dissipation fan for cooling the second heat dissipation fins is provided outside the cavity of the motor housing.

[0021] Optionally, in the above motor heat dissipation structure, the heating element includes an iron core and a winding, and the heat conductor is attached to the iron core.

[0022] An axial flux motor comprises a heat dissipation structure, wherein the heat dissipation structure is the motor heat dissipation structure as described in any one of the above items.

[0023] The motor heat dissipation structure provided by the present invention utilizes a heat-conducting member disposed within the cavity of the motor housing, which is bonded to the heating element within the cavity. This transfers heat generated by the heating element to a cooling system disposed outside the cavity of the motor housing, thereby dissipating the heat transferred by the heat-conducting member. By locating the cooling system outside the cavity of the motor housing, the axial space of the motor is avoided, maintaining the advantageous characteristics of the motor while maintaining a simple structure. Furthermore, the heat-conducting member directly bonds to the heating element, providing a clear heat dissipation path.

[0024] Compared to existing technologies, the motor heat dissipation structure provided by the present invention utilizes a cooling system positioned outside the motor housing cavity. This system, coupled with a heat-conducting member attached to the motor's heating element, transfers heat generated by the heating element to the cooling system outside the cavity. This reduces the axial space occupied by the heat dissipation structure and improves the motor's heat dissipation efficiency. Furthermore, compared to the complex water channels typically found within the motor housing, the present invention offers a simpler structure and lower production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0026] FIG1 is a schematic structural diagram of a motor heat dissipation structure provided in a first embodiment of the present invention;

[0027] FIG2 is a schematic structural diagram of a heat conducting member provided in Embodiment 1 of the present invention;

[0028] FIG3 is a schematic structural diagram of an iron core provided in Embodiment 1 of the present invention;

[0029] FIG4 is a schematic structural diagram of a winding provided in Embodiment 1 of the present invention;

[0030] FIG5 is a schematic diagram of the assembly of the heating element and the heat conducting member provided in the first embodiment of the present invention;

[0031] FIG6 is a schematic structural diagram of a cooling system provided in Example 1 of the present invention;

[0032] FIG7 is a schematic structural diagram of a motor provided in Embodiment 1 of the present invention;

[0033] FIG8 is a schematic diagram of the assembly of the heat conducting member and the motor housing provided in the first embodiment of the present invention;

[0034] FIG9 is a schematic structural diagram of a motor heat dissipation structure provided in a second embodiment of the present invention;

[0035] FIG10 is a schematic structural diagram of a motor heat dissipation structure provided in a third embodiment of the present invention.

[0036] Among them, 100 is the motor, 101 is the motor housing, 102 is the iron core, and 103 is the winding;

[0037] 200 is a heat conducting component, 201 is a first split component, and 202 is a second split component;

[0038] 300 is a cooling system, 301 is a first heat sink, 302 is a liquid storage chamber, 3021 is a liquid inlet, 3022 is a liquid outlet, 303 is a second heat sink, and 304 is a heat dissipation fan. DETAILED DESCRIPTION

[0039] The core of the present invention is to provide a motor heat dissipation structure to improve the heat dissipation efficiency of the motor.

[0040] Another core of the present invention is to provide an axial flux motor with the above motor heat dissipation structure.

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] As shown in Figure 1, an embodiment of the present invention discloses a motor heat dissipation structure, including a heat conductor 200 and a cooling system 300. It should be noted that in the prior art, the cooling water channel of the motor 100 is generally arranged inside the motor housing 101, and the heat on the main heating element winding 103 needs to be transferred to the motor housing water channel through the iron core 102 for heat dissipation, as shown in Figures 3 and 4. However, the outstanding feature of the axial flux motor is that the axial dimension is relatively small. When a water channel is provided inside the motor housing 101, it will occupy the axial space of the motor 100, making the axial dimension larger, weakening the advantages of the axial flux motor, and because the form of the water channel is relatively complex, the flow resistance increases, the energy consumption of the water pump increases, and the efficiency of the heat dissipation system is reduced. In addition, the complex water channel also increases the manufacturing difficulty of the motor housing 101 and increases the cost of the motor 100. The motor heat dissipation structure disclosed in the embodiment of the present invention utilizes a cooling system 300 disposed outside the cavity of the motor housing 101. The heat-conducting member 200 is bonded to the heating element of the motor 100 to transfer heat generated by the heating element to the cooling system 300 outside the cavity. This reduces the axial space occupied by the heat dissipation structure within the motor 100 and improves the heat dissipation efficiency of the motor 100. Furthermore, compared with the complex water channels traditionally disposed within the motor housing 101, the structure is simpler and the manufacturing cost is lower.

[0043] As shown in Figures 1, 2 and 8, the heat conducting member 200 is disposed in the cavity of the motor housing 101, and the heat conducting member 200 is attached to the heating element of the motor 100 located in the cavity to transfer the heat of the heating element. Specifically, as shown in Figures 3 and 4, the heating element includes an iron core 102 and a winding 103, and the winding 103 is wound around the iron core 102 so that the heat generated by the winding 103 is transferred to the iron core 102. At the same time, the heat conducting member 200 is attached to the iron core 102, as shown in Figure 5, so that the heat of the iron core 102 can be transferred from the heat conducting member 200 to the cooling system 300 to discharge the heat transferred by the heat conducting member 200.

[0044] As shown in Figures 1 and 6, cooling system 300 is disposed outside the cavity of motor housing 101, and heat conductor 200 is in communication with cooling system 300 to dissipate heat transferred by heat conductor 200. By locating cooling system 300 outside the cavity of motor housing 101, it avoids occupying axial space of motor 100, maintaining the advantageous characteristics of motor 100 and maintaining a simple structure. Furthermore, heat conductor 200 directly adheres to the heating element, providing a clear heat dissipation path. This reduces the axial space occupied by the heat dissipation structure within motor 100 and improves the heat dissipation efficiency of motor 100.

[0045] Furthermore, as shown in Figures 2 and 8, in a specific embodiment, there are multiple heat conductive members 200, and each heat conductive member 200 is distributed in a ring shape in the cavity of the motor housing 101, which can reduce the space occupied by the heat conductive members 200. The heat conductive members 200 are arranged at equal intervals. According to actual needs, the distance between the heat conductive members 200 can be reduced, and the number of heat conductive members 200 can be increased to increase the heat conduction area between the heat conductive members 200 and the iron core 102, thereby improving the heat dissipation efficiency of the motor 100. The distance between the heat conductive members 200 can also be increased, and the number of heat conductive members 200 can be reduced, thereby increasing the internal space of the cavity of the motor housing 101. Specifically, the heat conductive member 200 can be made of copper, and of course other materials with thermal conductivity can also be used. The heat conductor 200 has a split structure to facilitate its preparation. The heat conductor 200 includes a symmetrically arranged first and second split members 201, 202. The first and second split members 201, 202 are semicircular heat conductors, so that the first and second split members 201, 202 are arranged around the rotating axis of the motor housing 101 to form an annular distribution of the heat conductor 200, thereby avoiding interference with the rotation of the motor 100. Furthermore, a gap is reserved between the first and second split members 201, 202 to prevent thermal expansion of the heat conductor 200. This prevents expansion and squeezing forces between the first and second split members 201, 202, which could damage the heat conductor 200 and affect the heat dissipation efficiency of the motor 100.

[0046] Furthermore, as shown in Figures 6 and 7, in one specific embodiment, the cooling system 300 includes a first heat sink 301 and a liquid storage chamber 302. The first heat sink 301 is disposed within the liquid storage chamber 302. The heat conducting member 200 is connected to the first heat sink 301 so that the first heat sink 301 dissipates heat from the heating element. The liquid storage chamber 302 is filled with coolant, which accelerates the cooling of the first heat sink 301 and improves the heat dissipation efficiency of the motor 100. Specifically, the liquid storage chamber 302 is provided with a liquid inlet 3021 and a liquid outlet 3022. The liquid inlet 3021 and the liquid outlet 3022 are respectively configured to communicate with a liquid supply device, thereby forming a cooling circulation system with the liquid supply device and the liquid storage chamber 302. Furthermore, the liquid storage chamber 302 and the motor housing 101 are integrally formed, and a sealing partition is provided between the liquid storage chamber 302 and the interior of the motor housing 101. The sealing partition is provided with a mounting hole for the heat conductive member 200 to pass through. The heat conductive member 200 is sealedly connected to the mounting hole to prevent coolant from flowing into the motor housing 101 and damaging the motor components within the motor housing 101. The liquid supply device includes a water tank located on the vehicle and a water pump connected to the water tank. The liquid inlet 3021 is connected to the water pump, and the liquid outlet 3022 is connected to the water tank. The coolant can be cooling water, or other coolants. The cooling water is driven by the water pump to circulate within the liquid storage chamber 302, thereby forming a cooling circulation system and improving the heat dissipation efficiency of the heat transferred from the heat conductive member 200 to the first heat dissipating fin 301. It should be noted that when the motor 100 is a dual-stator single-rotor motor, each stator can be provided with the heat dissipation structure of the present application, and it is only necessary to connect the liquid inlet 3021 and the liquid outlet 3022 at the position of each stator in sequence end to end to form a liquid inlet 3021 and a liquid outlet 3022 to ensure that the liquid storage chamber 302 of the dual-stator single-rotor motor and the liquid supply equipment form a cooling circulation system, as shown in Figure 7.

[0047] Of course, the heat conducting member 200 can also be an integrated structure, and the heat conducting member 200 is a heat conducting pipe arranged in a ring shape around the rotating shaft of the motor housing 101, and the heat conducting pipe has a cavity for the circulation of the coolant. Among them, the liquid inlet and liquid outlet of the heat conducting pipe are respectively connected to the first heat dissipating fin 301, and are connected to the liquid storage chamber 302, so that the coolant in the liquid storage chamber 302 can flow through the heat conducting pipe, thereby further improving the heat dissipation efficiency of the motor 100. It should be noted that when the heat conducting member 200 adopts a heat conducting pipe, compared with the split heat conducting member 200, the axial space of the motor housing 101 occupied is larger, but the heat dissipation efficiency is further improved. The specific structural form of the heat conducting member 200 can be determined according to the actual needs of the motor 100. For example, for an axial flux motor with the advantage of small axial space, a split heat conducting member 200 can be used to reduce the occupation of the axial space by the heat conducting member 200, thereby giving play to the advantages of the axial flux motor.

[0048] As shown in FIG9 , in another specific embodiment, the cooling system 300 includes second heat sinks 303 disposed outside the cavity of the motor housing 101, and the heat conducting member 200 is connected to the second heat sinks 303. By exposing the second heat sinks 303 of the cooling system 300 to the external environment, the second heat sinks 303 increase the heat exchange area of ​​the motor 100 and improve the heat dissipation efficiency of the motor 100 compared to traditional naturally cooled motors.

[0049] As shown in FIG10 , to further improve the cooling efficiency of the second heat sink 303, in another specific embodiment, a heat dissipation fan 304 is provided outside the cavity of the motor housing 101. By exposing the second heat sink 303 of the cooling system 300 to the external environment and providing the heat dissipation fan 304 outside the motor housing 101 to improve the cooling effect of the second heat sink 303, the cooling efficiency of the second heat sink 303 can be further improved, thereby improving the heat dissipation efficiency of the motor 100, compared to a method in which the second heat sink 303 is exposed to the external environment and the heat dissipation of the motor 100 is achieved through natural cooling.

[0050] It should be noted that the heat dissipation structure of the motor 100 is not limited to the methods of the above-mentioned embodiments. The heat dissipation methods of the above-mentioned embodiments can also be combined. For example, for a dual-stator single-rotor motor, the heat dissipation fins of one stator can be placed in the external environment, and the heat dissipation fins of the other stator can be placed in the liquid storage chamber 302. Of course, the number of cooling fans 304 can also be increased or the wind direction angle of the cooling fans 304 can be changed to increase the wind receiving area of ​​the cooling fins and improve the cooling efficiency of the cooling fins.

[0051] The motor heat dissipation structure disclosed in the embodiment of the present invention disposes a heat conductor 200 within the cavity of the motor housing 101. The heat conductor 200 is in contact with the heating element of the motor 100 located within the cavity, thereby transferring the heat generated by the heating element to a cooling system 300 disposed outside the motor housing 101 to dissipate the heat transferred by the heat conductor 200. By disposing the cooling system 300 outside the cavity of the motor housing 101, it avoids occupying the axial space of the motor 100, ensuring the advantages of the motor 100, and maintaining a simple structure. Furthermore, the heat conductor 200 directly contacts the heating element, providing a clear heat dissipation path.

[0052] Compared to the prior art, the motor heat dissipation structure disclosed in the embodiments of the present invention achieves a simpler structure and lowers manufacturing costs by positioning the cooling system 300 outside the cavity of the motor housing 101 and attaching the heat-generating element within the cavity via the heat-conducting member 200. This reduces the axial space occupied by the heat dissipation structure within the motor 100 while improving the heat dissipation efficiency of the motor 100. Furthermore, compared to the complex water channels traditionally provided within the motor housing 101, the structure is simpler and the manufacturing cost is lower.

[0053] An embodiment of the present invention further discloses an axial flux motor, including a heat dissipation structure. The heat dissipation structure is the motor heat dissipation structure disclosed in the above embodiment, and therefore has all the technical effects of the above motor heat dissipation structure, which will not be described in detail herein.

[0054] The terms "first," "second," and the like in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may include steps or elements that are not listed.

[0055] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A motor heat dissipation structure, characterized in that: include: A heat conducting member (200) is used to be arranged in a cavity of a motor housing (101) where a heating element of the motor (100) is located, and the heat conducting member (200) is in contact with the heating element to transfer heat from the heating element; The cooling system (300) is used to be arranged outside the cavity of the motor housing (101) where the heating element is located, and the heat conducting element (200) is connected to the cooling system (300) to discharge the heat transferred by the heat conducting element (200).

2. The motor heat dissipation structure according to claim 1, characterized in that: There are a plurality of heat-conducting members (200), and each heat-conducting member (200) is distributed in the motor housing (101) in a ring shape, and each heat-conducting member (200) is arranged at equal intervals.

3. The motor heat dissipation structure according to claim 2, characterized in that: The heat conducting component (200) is a split structure, and the heat conducting component (200) comprises a first split component (201) and a second split component (202) that are symmetrically arranged, and the first split component (201) and the second split component (202) are arranged around the rotating shaft of the motor housing (101) to form the heat conducting component (200) distributed in an annular manner.

4. The motor heat dissipation structure according to claim 1, characterized in that: The cooling system (300) comprises a first heat dissipation fin (301) and a liquid storage chamber (302) for containing a coolant, wherein the first heat dissipation fin (301) is arranged in the liquid storage chamber (302), and the heat conducting element (200) is connected to the first heat dissipation fin (301) so that the first heat dissipation fin (301) discharges the heat of the heating element.

5. The motor heat dissipation structure according to claim 4, characterized in that: The liquid storage chamber (302) is provided with a liquid inlet (3021) and a liquid outlet (3022), and the liquid inlet (3021) and the liquid outlet (3022) are respectively used to communicate with a liquid supply device, so that the liquid supply device and the liquid storage chamber (302) form a cooling circulation system.

6. The motor heat dissipation structure according to claim 4, characterized in that: The liquid storage chamber (302) and the motor housing (101) are of an integrated structure, and a sealing partition is provided between the liquid storage chamber (302) and the inside of the motor housing (101), and a mounting hole for the heat conducting member (200) to pass through is provided on the sealing partition, and the heat conducting member (200) is sealed and connected to the mounting hole.

7. The motor heat dissipation structure according to claim 1, characterized in that: The cooling system (300) comprises a second heat dissipation fin (303) arranged outside the cavity of the motor housing (101), and the heat conducting member (200) is connected to the second heat dissipation fin (303).

8. The motor heat dissipation structure according to claim 7, characterized in that: A heat dissipation fan (304) for cooling the second heat dissipation fins (303) is arranged outside the cavity of the motor housing (101).

9. The motor heat dissipation structure according to any one of claims 1 to 8, characterized in that: The heating element comprises an iron core (102) and a winding (103), and the heat conducting member (200) is bonded to the iron core (102).

10. An axial flux motor, comprising a heat dissipation structure, characterized in that: The heat dissipation structure is the motor heat dissipation structure as claimed in any one of claims 1 to 9.

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