CN114844270A - A stator assembly and motor - Google Patents

Abstract

The invention provides a stator assembly and a motor, wherein the stator assembly comprises a stator core with a plurality of stator slots, two layers of windings are arranged in each stator slot, a gap is arranged between the two layers of windings, the stator assembly also comprises a heat dissipation part for dissipating heat of the windings, the heat dissipation part comprises a heat conduction pipe and a heat dissipation element, one end of the heat conduction pipe is connected with the heat dissipation element, the other end of the heat conduction pipe is inserted into the gap and is in contact heat conduction with the windings, heat conduction silicone grease with electric insulation is filled in the gap, and the heat conduction silicone grease is used for transferring heat generated by the windings to the heat conduction pipe. This technical scheme's stator module and motor makes the motor of using this technical scheme stabilize the temperature rise when the operation and have reduction by a relatively large margin, and power density and reliability obtain promoting by a wide margin for solve the problem that this type of motor operation temperature rise is too high and the unmanned aerial vehicle payload that motor power density low leads to is not enough under the prior art, thereby improve unmanned aerial vehicle's payload, time of endurance and reliability.

Description

A stator assembly and motor

technical field

The present invention relates to the technical field of motors, and in particular, to a stator assembly and a motor.

Background technique

The development trend of large and heavy-duty UAVs puts forward higher requirements on the power density, torque density and reliability of the motors. At this stage, 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 for improving the performance of the motor and promoting the development of the industry.

The current density and thermal load of high power density motors are usually relatively large, so the motor generates a lot of heat during operation, and the temperature rise of the motor is relatively high. The UAV drive motor has high requirements on power-to-weight ratio and reliability, so air-cooled heat dissipation is usually adopted. However, without adding an additional heat dissipation structure, due to the long heat dissipation path and the large thermal resistance on the path, the heat inside the motor cannot be quickly and effectively conducted to the casing and dissipated into the air in time, which will cause the temperature of the motor to rise. If it is too high, it will affect the performance and reliability of the motor.

The performance of the permanent magnets in the permanent magnet motor will drop significantly with the increase of temperature, and demagnetization will occur and affect the electromagnetic performance of the motor; in severe cases, permanent demagnetization may occur and the motor will be completely unable to work, which seriously threatens the safe operation of the aircraft.

Therefore, research and development of stator components and their motors with advanced cooling systems is of great significance for improving the performance and reliability of UAVs.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a stator assembly with heat dissipation effect, so that the stable temperature rise of the motor using the technical solution is greatly reduced during operation, and the power density and reliability are greatly improved, so as to solve the problem of existing Under the technology, the operating temperature of this type of motor is too high and the power density of the motor is low, resulting in insufficient payload of the UAV, thereby improving the payload, endurance and reliability of the UAV.

The above-mentioned purpose of the present invention is realized by the following technical solutions:

A stator assembly includes a stator core with a plurality of stator slots, two layers of windings are arranged in each of the stator slots, and a gap is arranged between the two layers of the windings, and the stator assembly further includes a The heat dissipation part for the heat dissipation of the winding, the heat dissipation part includes a heat pipe and a heat dissipation element, one end of the heat pipe is connected with the heat dissipation element, and the other end of the heat pipe is inserted into the gap and conducts heat conduction with the winding through contact, so 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 winding to the heat conduction pipe.

The beneficial effects of the above technical solutions are: by arranging the heat pipe and the heat dissipation element, the heat generated by the winding is partially introduced into the heat pipe, and then the heat is introduced into the heat dissipation element through the heat pipe, and the heat is diffused to the outside atmosphere through the heat dissipation element, which is beneficial to the heat dissipation of the winding. Heat dissipation, in which the end of the heat pipe can be inserted into the gap, so that the heat dissipation element can be supported by the heat pipe, and the stability of the heat dissipation element is improved, and the thermal grease filled in the gap can increase the contact area between the heat pipe and the winding, further Improve the efficiency of heat transfer between the heat pipe and the winding, and at the same time, the heat conductive silicone grease has electrical insulation, which can electrically isolate the heat pipe and the winding to prevent the leakage of the winding.

Preferably, the heat pipe includes a first heat pipe, the heat dissipation element includes a heat dissipation plate group, and the heat dissipation plate group includes a plurality of heat dissipation fins arranged at intervals, and a plurality of the heat dissipation fins are provided for connecting the first heat pipe. the first connection part. A plurality of radiating fins arranged at intervals greatly increase the contact surface between the radiating plate group and the outside atmosphere, which is beneficial to the rapid heat dissipation of the radiating plate group. Facilitates heat transfer.

Preferably, the first connecting portion includes a connecting pipe that penetrates through a plurality of the heat sinks, the connecting pipe is provided with a through hole, the through hole is used for the first heat pipe to be inserted, and the connecting pipe Conduct heat conduction through contact with the first heat pipe. The connecting tube is inserted into multiple heat sinks, increasing the contact between the connecting tube and multiple heat sinks, so that the connection of multiple heat sinks is more stable. The first heat pipe is effectively connected, and the connection stability and heat transfer efficiency can be improved.

Preferably, the first connecting part includes a connecting plate, a plurality of the cooling fins are arranged on one side of the connecting plate, and the other side of the connecting plate is provided with a first adhesive for bonding the first heat pipe layer, the first adhesive layer has the function of transferring the heat of the first heat pipe to the connecting plate. By setting the connecting plate, a plurality of heat sinks can be effectively connected, and at the same time, the first adhesive layer on the connecting plate can bond the first heat pipe to increase the contact surface between the two, so as to realize the effective connection between the plurality of heat sinks and the first heat pipe, so that the two The connection is convenient, and the heat conduction of the first adhesive layer is beneficial to improve the heat transfer efficiency between the first heat pipe and the connecting plate.

Preferably, the heat transfer pipe further includes a second heat pipe, the heat dissipation element includes a bracket for supporting the stator iron core, the bracket is interference fit in the installation through groove of the stator iron core, and the bracket connected with the second heat pipe through a second connection part. By adopting the above structure, the bracket can provide heat dissipation for the winding, and at the same time, through the second connection portion, the installation stability of the second heat pipe can be improved.

Preferably, the second connecting part includes ribs arranged on the bracket, the ribs are provided with a second adhesive layer for bonding the second heat pipe, and the second adhesive layer has the ability to reduce the heat of the second heat pipe Transfer to the ribs. By arranging the ribs, on the one hand, the structural strength of the bracket can be increased, and on the other hand, it can provide an effective position for the connection between the second heat pipe and the bracket, which facilitates the connection through the second adhesive layer, increases the contact surface between the two, and at the same time the second adhesive layer The heat conduction of the layer is beneficial to improve the heat transfer efficiency between the second heat pipe and the bracket.

Preferably, the heat dissipation part includes a plurality of first heat pipes and a plurality of second heat pipes, and the plurality of the first heat pipes and the second heat pipes are uniformly distributed on the stator iron core along the circumferential direction. By adopting the above structure, heat dissipation elements can be added, and the heat dissipation effect can be improved.

Preferably, the first heat pipe is in an outwardly bent structure, the heat dissipation plate group connected to the first heat pipe is disposed away from the winding, the second heat pipe is bent toward the bracket, and the bending of the first heat pipe and the second heat pipe is The folding angle is 80-100 degrees. By adopting the above structure, the bent heat-conducting pipe can spread the heat-dissipating element, which is beneficial to heat dissipation.

Preferably, the material of the heat transfer pipe is copper alloy, and the material of the heat dissipation element is aluminum alloy. By using a copper alloy heat pipe and an aluminum alloy heat dissipation element, the heat conduction performance can be improved while taking into account the cost, which is beneficial to the heat conduction of the winding and the heat dissipation.

The present invention also discloses a motor, including the above stator assembly, the motor with the stator assembly has a relatively large reduction in the stable temperature rise during operation, and the power density and reliability are greatly improved, so as to solve the problem of existing problems. Under the technology, the operating temperature of this type of motor is too high and the power density of the motor is low, resulting in insufficient payload of the UAV, thereby improving the payload, endurance and reliability of the UAV.

Description of drawings

Fig. 1 is the exploded structure schematic diagram of the stator assembly of Embodiment 1;

2 is a schematic diagram of the overall structure of the stator assembly of the first embodiment;

3 is a schematic diagram of the overall structure of the motor of the first embodiment;

FIG. 4 is a schematic structural diagram of the heat dissipation plate set according to the first embodiment;

5 is a schematic structural diagram of a first heat pipe;

6 is a schematic structural diagram of the heat dissipation plate group of the second embodiment;

Description of reference numbers:

1. Stator iron core; 11. Installation slot; 2. Winding; 3. Gap; 4. Heat dissipation part; 41. Heat conduction pipe; 411, First heat pipe; 412, Second heat pipe; 421, heat sink; 422, connecting pipe; 4221, through hole; 423, connecting plate; 5, bracket; 51, rib.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

Example 1

As shown in FIGS. 1-5 , 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. The interference fit is in the installation through slot 11 of the stator core 1. The bracket 5 is provided with a rib 51. Each of the stator slots is provided with two layers of windings 2. There is a gap 3 between them, and the stator assembly also includes a heat dissipation portion 4 for heat dissipation of the winding 2. The heat dissipation portion 4 includes 24 heat pipes 41, and the 24 heat pipes 41 include 18 first heat pipes 411 and 6 One end of the 18 first heat pipes 411 is connected to a heat dissipation plate group 42, and the other end is inserted into the gap 3 of the corresponding stator slot. The heat dissipation plate group 42 is evenly distributed in the stator core along the circumferential direction. 1, one end of the remaining six second heat pipes 412 is connected to the rib 51 of the bracket 5, and the other end is inserted into the gap 3 of the corresponding stator slot, and the gap 3 is provided with a heat conduction for filling the gap 3. Silicon grease, which has adhesiveness, high thermal conductivity and good insulation after consolidation, so that the 24 heat pipes 41 are stably inserted into the gaps 3 of the stator slots. The thermal grease is used for The heat generated by the winding 2 is transferred to the heat pipe 41 .

Specifically, the heat dissipation plate set 42 includes a plurality of heat dissipation fins 421 arranged at intervals, and the plurality of the heat dissipation fins 421 are provided with a first connection portion for connecting the first heat pipe 411 , and the first connection portion includes A plurality of connecting pipes 422 pierced through the heat sinks 421, the connecting pipes 422 are provided with through holes 4221, the through holes 4221 are used for the first heat pipes 411 to be inserted, and the connecting pipes 422 are connected with the first heat pipes 422. A heat pipe 411 conducts heat through contact, and thermally conductive silicone grease for transferring heat is provided between the connecting pipe 422 and the first heat pipe 411 .

In order to improve the heat dissipation effect of the stator assembly, the material of the heat transfer pipe 41 is copper alloy, the inner cavity of the heat transfer pipe 41 is provided with a heat transfer medium, the heat transfer medium is water, and the material of the heat dissipation plate group 42 is aluminum alloy , the material of the bracket 5 is aluminum alloy, so that the thermal conductivity can be improved while taking into account the cost, which is beneficial to the heat conduction of the winding 2 and the heat dissipation.

The first heat pipe 411 has an outward bending structure, the heat dissipation plate group 42 connected to the first heat pipe 411 is disposed away from the winding 2, the second heat pipe 412 is bent toward the bracket 5, the first heat pipe 411 and the second heat pipe 411 The bending angle 413 of the two heat pipes 412 is 90 degrees, thereby limiting the bending angle 413, so that the heat dissipation elements are stretched to the maximum extent, and the heat dissipation effect is improved.

The six second heat pipes 412 of the heat dissipation part 4 are connected to the ribs 51 of the bracket 5 through thermal conductive silicone grease.

The invention also discloses a motor including the above stator assembly, 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 The improvement is used to solve the problem of insufficient payload of the UAV caused by the high temperature rise of the motor and the low power density of the motor under the existing technology, thereby improving the payload, endurance and reliability of the UAV.

Embodiment 2

As shown in FIG. 6 , the difference between this embodiment and the first embodiment is that the first connecting portion of the heat dissipation plate group 42 includes a connecting plate 423 , and a plurality of the heat dissipation fins 421 are disposed on the connecting plate 423 . On one side, the other side of the connecting plate 423 is bonded to the first heat pipe 411 through thermally conductive silicone grease.

Embodiment 3

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 pipes 411 away from the winding 2 is connected to one of the first heat pipes 411 . The heat dissipation plate group 42 .

Although the present disclosure is disclosed above, the scope of protection of the present 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 present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims (10)

1. A stator assembly, comprising a stator core (1) having a plurality of stator slots, and each of the stator slots is provided with two layers of windings (2), characterized in that the two layers of the windings (2) There is a gap (3) therebetween, the stator assembly further includes a heat dissipation part (4) for heat dissipation of the winding (2), the heat dissipation part (4) includes a heat pipe (41) and a heat dissipation element, the heat dissipation part (4) One end of the tube (41) is connected with the heat dissipation element, the other end of the heat transfer tube (41) is inserted into the gap (3) and conducts heat conduction with the winding (2) through contact, and the gap (3) is filled with The thermal conductive silicone grease with electrical insulation is used for transferring the heat generated by the winding (2) to the thermal conductive pipe (41). 2 . The stator assembly according to claim 1 , wherein the heat-conducting pipe ( 41 ) comprises a first heat pipe ( 411 ), and the heat-dissipating element comprises a heat-dissipating plate group ( 42 ), the heat-dissipating plate group ( 42 ). ) includes a plurality of radiating fins (421) arranged at intervals, and a first connecting portion for connecting the first heat pipe (411) is provided on the plurality of the radiating fins (421). 3 . The stator assembly according to claim 2 , wherein the first connecting portion comprises a connecting pipe ( 422 ) passing through a plurality of the cooling fins ( 421 ), and the connecting pipe ( 422 ) A through hole (4221) is provided on the through hole (4221) for the first heat pipe (411) to be inserted and connected, and the connecting pipe (422) and the first heat pipe (411) conduct thermal conduction through contact. 4. The stator assembly according to claim 2, characterized in that, the first connecting portion comprises a connecting plate (423), and a plurality of the cooling fins (421) are disposed on one side of the connecting plate (423) , 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 the heat of the first heat pipe (411) to the connection board (423). 5. The stator assembly according to any one of claims 1-4, wherein the heat-conducting pipe (41) further comprises a second heat pipe (412), and the heat-dissipating element comprises a structure for supporting the stator core The bracket (5) of (1), the bracket (5) is interference fit in the installation through groove (11) of the stator iron core (1), the bracket (5) and the second heat pipe (412) ) are connected through the second connecting portion. 6. The stator assembly according to claim 5, characterized in that the second connecting part comprises a rib (51) provided on the bracket (5), and the rib (51) is provided with a rib (51) for bonding the second connecting part The second adhesive layer of the heat pipe (412), the second adhesive layer has the function of transferring the heat of the second heat pipe (412) to the ribs (51). 7. The stator assembly according to claim 5, wherein the heat dissipation part (4) comprises a plurality of first heat pipes (411) and a second heat pipe (412), and a plurality of the first heat pipes (411) and the second heat pipes (412) are evenly distributed on the stator iron core (1) along the circumferential direction. 8 . The stator assembly according to claim 5 , wherein the first heat pipe ( 411 ) is in an outwardly bent structure, and the heat dissipation plate group ( 42 ) connected to the first heat pipe ( 411 ) is far away from the winding. 9 . (2) Setting, 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. 9 . The stator assembly according to claim 1 , wherein the material of the heat conduction pipe ( 41 ) is copper alloy, and the material of the heat dissipation element is aluminum alloy. 10 . 10. A motor, characterized by comprising the stator assembly according to any one of claims 1-9.

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