Stator assembly and motor

Abstract

The present invention provides a stator assembly and a motor, wherein the stator assembly includes a stator core having a plurality of stator slots, each stator slot is provided with two layers of windings, a gap is provided between the two layers of windings, and the stator assembly also includes a heat dissipation portion for dissipating heat from the windings, the heat dissipation portion includes a heat pipe and a heat dissipation element, one end of the heat pipe is connected to the heat dissipation element, the other end of the heat pipe is inserted into the gap and conducts heat with the windings through contact, the gap is filled with thermally conductive silicone grease with electrical insulation, and the thermally conductive silicone grease is used to transfer the heat generated by the windings to the heat pipe. The stator assembly and the motor of the present technical solution can significantly reduce the stable temperature rise of the motor using the technical solution during operation, and greatly improve the power density and reliability, so as to solve the problem of insufficient payload of the drone caused by the excessively high operating temperature rise and low power density of the motor under the prior art, thereby improving the payload, endurance and reliability of the drone.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly and a motor. Background Art

[0002] The development trend of large and heavy-load UAVs has put forward higher requirements on the power density, torque density and reliability of motors. At present, the main bottleneck restricting the improvement of motor performance is the thermal management system of the motor. Therefore, improving the heat dissipation conditions of the motor is of great significance to improving the performance of the motor and promoting the development of the industry.

[0003] The current density and heat load of high power density motors are usually large, so the motor generates a lot of heat during operation and the motor temperature rise is high. Drone drive motors have high requirements for power-to-weight ratio and reliability, so air cooling is usually used. However, without adding additional heat dissipation structures, due to the long heat dissipation path and large thermal resistance on the path, the heat inside the motor cannot be quickly and effectively transferred to the casing and dissipated into the air in time, which will cause the motor temperature to rise too high, thus affecting the motor performance and reliability.

[0004] The performance of the permanent magnets in a permanent magnet motor will drop significantly as the temperature rises, causing demagnetization and affecting the electromagnetic properties of the motor. In severe cases, permanent demagnetization may occur and make the motor completely unable to work, seriously threatening the safe operation of the aircraft.

[0005] Therefore, research and development of stator components and their motors with advanced heat dissipation systems are of great significance to improving the performance and reliability of UAVs. Summary of the invention

[0006] The main purpose of the present invention is to provide a stator assembly with a heat dissipation effect, so that the stable temperature rise of the motor using this technical solution is significantly reduced during operation, and the power density and reliability are greatly improved, so as to solve the problem of insufficient UAV payload caused by excessively high operating temperature rise and low motor power density of such motors under the prior art, thereby improving the UAV payload, endurance time and reliability.

[0007] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0008] A stator assembly comprises a stator core having a plurality of stator slots, wherein each of the stator slots is provided with two layers of windings, a gap is provided between the two layers of the windings, the stator assembly further comprises a heat dissipation portion for dissipating heat from the windings, the heat dissipation portion comprises a heat pipe and a heat dissipation element, one end of the heat pipe is connected to the heat dissipation element, the other end of the heat pipe is inserted into the gap and conducts heat with the windings through contact, the gap is filled with thermally conductive silicone grease having electrical insulation, the thermally conductive silicone grease is used to transfer heat generated by the windings to the heat pipe.

[0009] The beneficial effects of the above technical solution are as follows: by arranging a heat-conducting pipe and a heat-dissipating element, part of the heat generated by the winding is introduced into the heat-conducting pipe, and the heat is then introduced into the heat-dissipating element through the heat-conducting pipe, and the heat is diffused to the outside atmosphere through the heat-dissipating element, which is beneficial to the heat dissipation of the winding, wherein the end of the heat-conducting pipe can be inserted into the gap, so that the heat-dissipating element can be supported by the heat-conducting pipe, thereby improving the stability of the heat-dissipating element, and the thermal grease filled in the gap can increase the contact area between the heat-conducting pipe and the winding, further improving the efficiency of heat transfer between the heat-conducting pipe and the winding, and at the same time, the thermal grease has electrical insulation, which can electrically isolate the heat-conducting pipe and the winding, and prevent the occurrence of winding leakage.

[0010] Preferably, the heat pipe includes a first heat pipe, the heat dissipation element includes a heat dissipation plate group, the heat dissipation plate group includes a plurality of heat dissipation fins arranged at intervals, and a first connection portion for connecting the first heat pipe is provided on the plurality of heat dissipation fins. The plurality of heat dissipation fins arranged at intervals greatly increase the contact surface between the heat dissipation plate group and the outside atmosphere, which is beneficial to the rapid heat dissipation of the heat dissipation plate group. At the same time, the first connection portion is provided to facilitate the connection between the heat dissipation plate group and the first heat pipe of the heat pipe, thereby facilitating heat transfer.

[0011] Preferably, the first connection part includes a connection tube that is inserted through a plurality of the heat sinks, the connection tube is provided with a through hole, the through hole is for the first heat pipe to be plugged in, and the connection tube and the first heat pipe are heat-conducted by contact. By inserting the connection tube into a plurality of heat sinks, the connection between the connection tube and the plurality of heat sinks is increased, so that the connection of the plurality of heat sinks is more stable, and at the same time, the through hole on the connection tube is for the first heat pipe to be plugged in, so that the plurality of heat sinks and the first heat pipe are effectively connected, and the connection stability and heat transfer efficiency can be improved.

[0012] Preferably, the first connection portion includes a connection plate, a plurality of the heat sinks are arranged on one side of the connection plate, and a first adhesive layer for bonding the first heat pipe is arranged on the other side of the connection plate, and the first adhesive layer has the function of transferring the heat of the first heat pipe to the connection plate. By providing a connection plate, multiple heat sinks can be effectively connected, and at the same time, the first adhesive layer on the connection plate can bond the first heat pipe to increase the contact surface between the two, thereby achieving effective connection between multiple heat sinks and the first heat pipe, making the connection between the two convenient, and the heat conduction of the first adhesive layer is conducive to improving the heat transfer efficiency between the first heat pipe and the connection plate.

[0013] Preferably, the heat conducting pipe further includes a second heat pipe, the heat dissipation element includes a bracket for supporting the stator core, the bracket is interference-fitted in the mounting slot of the stator core, and the bracket is connected to the second heat pipe via a second connecting portion. By adopting the above structure, the bracket can provide heat dissipation for the winding, and the second connecting portion can improve the installation stability of the second heat pipe.

[0014] Preferably, the second connection portion includes a rib disposed on the bracket, and a second adhesive layer for bonding the second heat pipe is disposed on the rib, and the second adhesive layer has the function of transferring the heat of the second heat pipe to the rib. By providing the rib, on the one hand, the structural strength of the bracket can be increased, and on the other hand, an effective position can be provided for the connection between the second heat pipe and the bracket, which is convenient for connection through the second adhesive layer, increases the contact surface between the two, and at the same time, the heat conduction of the second adhesive layer is conducive to improving the heat transfer efficiency between the second heat pipe and the bracket.

[0015] Preferably, the heat dissipation unit includes a plurality of first heat pipes and a second heat pipe, and the plurality of first heat pipes and second heat pipes are evenly distributed on the stator core along the circumferential direction. By adopting the above structure, heat dissipation elements can be increased and the heat dissipation effect can be improved.

[0016] Preferably, the first heat pipe is in an outward bending structure, the heat dissipation plate group connected to the first heat pipe is arranged away from the winding, the second heat pipe is bent toward the bracket, and the bending angle of the first heat pipe and the second heat pipe is 80-100 degrees. By adopting the above structure, the bent heat pipe can prop up the heat dissipation element, which is beneficial to heat dissipation.

[0017] Preferably, the heat pipe is made of copper alloy, and the heat dissipation element is made of aluminum alloy. By using the copper alloy heat pipe and the aluminum alloy heat dissipation element, the thermal conductivity can be improved while taking into account the cost, which is beneficial to the heat conduction of the winding and the heat dissipation.

[0018] The present invention also discloses a motor, comprising a stator assembly as described above. The motor having the stator assembly has a significantly reduced stable temperature rise during operation, and its power density and reliability are greatly improved, so as to solve the problem of insufficient payload of the UAV caused by excessively high operating temperature rise and low power density of such motors under the prior art, thereby improving the payload, flight time and reliability of the UAV. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the exploded structure of the stator assembly of the first embodiment;

[0020] Figure 2 is a schematic diagram of the overall structure of the stator assembly of the first embodiment;

[0021] Figure 3 is a schematic diagram of the overall structure of the motor of Embodiment 1;

[0022] Figure 4 is a schematic structural diagram of the heat dissipation plate group of the first embodiment;

[0023] Figure 5 is a schematic structural diagram of a first heat pipe;

[0024] Figure 6is a structural schematic diagram of the heat dissipation plate group of the second embodiment;

[0025] Description of reference numerals:

[0026] 1. stator core; 11. mounting slot; 2. winding; 3. gap; 4. heat dissipation part; 41. heat pipe; 411. first heat pipe; 412. second heat pipe; 413. bending angle; 42. heat dissipation plate group; 421. heat sink; 422. connecting pipe; 4221. through hole; 423. connecting plate; 5. bracket; 51. rib. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] Embodiment 1

[0030] like Figure 1-5 As shown, the present invention provides a stator assembly, including a stator core 1 with 24 stator slots, the stator core 1 is provided with a bracket 5 for supporting the stator core 1, the bracket 5 is interference-fitted in the installation slot 11 of the stator core 1, the bracket 5 is provided with ribs 51, each of the stator slots is provided with two layers of windings 2, a gap 3 is provided between the two layers of the windings 2, the stator assembly also includes a heat dissipation portion 4 for dissipating heat from the windings 2, the heat dissipation portion 4 includes 24 heat pipes 41, the 24 heat pipes 41 include 18 first heat pipes 411 and 6 second heat pipes 412, wherein the 18 first heat pipes 411 and 6 second heat pipes 412 are provided. One end of a heat pipe 411 is connected to a heat sink group 42, and the other end of the heat sink group 42 is inserted into the gap 3 of the corresponding stator slot. The heat sink group 42 is evenly distributed on the stator core 1 along the circumferential direction. One end of the remaining 6 second heat pipes 412 is connected to the rib 51 of the bracket 5, and the other end of the heat pipes 412 is inserted into the gap 3 of the corresponding stator slot. The gap 3 is provided with thermal grease for filling the gap 3. After solidification, the thermal grease has adhesion, high thermal conductivity and good insulation, so that the 24 heat pipes 41 are stably inserted in the gap 3 of the stator slot respectively. The thermal grease is used to transfer the heat generated by the winding 2 to the heat pipe 41.

[0031] Specifically, the heat sink group 42 includes a plurality of heat sinks 421 that are spaced apart, and a first connecting portion for connecting the first heat pipe 411 is provided on each of the heat sinks 421. The first connecting portion includes a connecting tube 422 that passes through the plurality of heat sinks 421. A through hole 4221 is provided on the connecting tube 422, and the through hole 4221 is used for plugging the first heat pipe 411. The connecting tube 422 and the first heat pipe 411 conduct heat through contact, and a thermal conductive silicone grease for transferring heat is provided between the connecting tube 422 and the first heat pipe 411.

[0032] In order to improve the heat dissipation effect of the stator assembly, the heat pipe 41 is made of copper alloy, the inner cavity of the heat pipe 41 is provided with a heat conducting medium, the heat conducting medium is water, the heat dissipation plate group 42 is made of aluminum alloy, and the bracket 5 is made of aluminum alloy. In this way, the thermal conductivity can be improved while taking into account the cost, which is beneficial to the heat conduction of the winding 2 and facilitates heat dissipation.

[0033] The first heat pipe 411 has an outward bending structure. The heat sink group 42 connected to the first heat pipe 411 is arranged away from the winding 2. The second heat pipe 412 is bent toward the bracket 5. The bending angle 413 of the first heat pipe 411 and the second heat pipe 412 is 90 degrees. The bending angle 413 is limited to maximize the expansion of the heat dissipation element and improve the heat dissipation effect.

[0034] The six second heat pipes 412 of the heat dissipation unit 4 are connected to the ribs 51 of the bracket 5 through thermal grease.

[0035] The present invention also discloses a motor, including the above-mentioned stator assembly, wherein the motor is an outer rotor motor. The stable temperature rise of the motor with the stator assembly is greatly reduced during operation, and the power density and reliability are greatly improved, so as to solve the problem of insufficient payload of the UAV caused by the excessively high operating temperature rise and low power density of the motor under the prior art, thereby improving the payload, endurance and reliability of the UAV.

[0036] Embodiment 2

[0037] like Figure 6 As shown, the difference between this embodiment and embodiment one is that the first connecting portion of the heat sink group 42 includes a connecting plate 423, a plurality of heat sinks 421 are arranged on one side of the connecting plate 423, and the other side of the connecting plate 423 is bonded to the first heat pipe 411 by thermal grease.

[0038] Embodiment 3

[0039] The difference between this embodiment and the first embodiment is that the 24 heat pipes 41 of the heat dissipation part 4 of the stator assembly are all first heat pipes 411 , and one end of the first heat pipe 411 away from the winding 2 is connected to a heat dissipation plate group 42 .

[0040] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A stator assembly, comprising a stator core (1) having a plurality of stator slots, each of the stator slots being provided with two layers of windings (2), characterized in that: A gap (3) is provided between the two layers of the winding (2), the stator assembly further comprising a heat dissipation portion (4) for dissipating heat from the winding (2), the heat dissipation portion (4) comprising a heat conducting pipe (41) and a heat dissipation element, one end of the heat conducting pipe (41) being connected to the heat dissipation element, the other end of the heat conducting pipe (41) being inserted into the gap (3) and conducting heat with the winding (2) through contact, the gap (3) being filled with thermally conductive silicone grease having electrical insulation properties, the thermally conductive silicone grease being used to transfer heat generated by the winding (2) to the heat conducting pipe (41); The heat conducting pipe (41) comprises a first heat pipe (411), the heat dissipation element comprises a heat dissipation plate group (42), the heat dissipation plate group (42) comprises a plurality of heat dissipation fins (421) arranged at intervals, and a first connection portion for connecting to the first heat pipe (411) is provided on the plurality of heat dissipation fins (421); The first connection portion comprises a connection tube (422) which is passed through a plurality of the heat sinks (421); the connection tube (422) is provided with a through hole (4221); the through hole (4221) is used for the first heat pipe (411) to be plugged in; the connection tube (422) and the first heat pipe (411) are heat-conducted by contact; The first connecting portion comprises a connecting plate (423), a plurality of heat sinks (421) are arranged on one side of the connecting plate (423), and the other side of the connecting plate (423) is provided with a first adhesive layer for bonding the first heat pipe (411), and the first adhesive layer has the function of transferring heat of the first heat pipe (411) to the connecting plate (423); The heat-conducting pipe (41) further comprises a second heat pipe (412), the heat dissipating element comprises a bracket (5) for supporting the stator core (1), the bracket (5) is interference-fitted in the mounting slot (11) of the stator core (1), and the bracket (5) is connected to the second heat pipe (412) via a second connecting portion; The second connection portion comprises a rib (51) arranged on the bracket (5), the rib (51) being provided with a second adhesive layer for bonding the second heat pipe (412), the second adhesive layer having the function of transferring heat of the second heat pipe (412) to the rib (51).

2. The stator assembly according to claim 1, characterized in that: The heat dissipation portion (4) comprises a plurality of first heat pipes (411) and second heat pipes (412), and the plurality of first heat pipes (411) and second heat pipes (412) are evenly distributed on the stator core (1) along the circumferential direction.

3. The stator assembly according to claim 1, characterized in that: The first heat pipe (411) is in an outwardly bent structure; the heat sink group (42) connected to the first heat pipe (411) is arranged away from the winding (2); the second heat pipe (412) is bent toward the bracket (5); and the bending angle (413) of the first heat pipe (411) and the second heat pipe (412) is 80-100 degrees.

4. The stator assembly according to claim 1, characterized in that: The material of the heat conducting pipe (41) is copper alloy, and the material of the heat dissipating element is aluminum alloy.

5. A motor, characterized in that: The stator assembly comprises the stator assembly according to any one of claims 1 to 4.

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