CN114844270A

CN114844270A - Stator module and motor

Info

Publication number: CN114844270A
Application number: CN202210521873.1A
Authority: CN
Inventors: 张晓晨; 赵韩; 李静; 张何
Original assignee: University of Nottingham Ningbo China
Current assignee: University of Nottingham Ningbo China
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-08-02

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

Stator module and motor

Technical Field

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

Background

The development trend of large heavy-duty unmanned aerial vehicles puts higher requirements on the power density, the torque density and the reliability of the motor. The main bottleneck limiting the improvement of the motor performance at the present stage is the heat management system of the motor, so that the improvement of the heat dissipation condition of the motor has important significance for improving the performance of the motor and promoting the development of the industry.

The current density and the heat load of the high-power density motor are usually larger, so that the motor generates a large amount of heat in the running process, and the temperature rise of the motor is higher. Unmanned aerial vehicle driving motor requires highly to power-to-weight ratio and reliability, consequently adopts the forced air cooling heat dissipation mode usually. However, under the condition that no additional heat dissipation structure is added, because the heat dissipation path is long and the thermal resistance on the path is large, the heat inside the motor cannot be quickly and effectively conducted to the casing and dissipated to the air in time, which may cause the temperature rise of the motor to be too high, and further affect the performance and reliability of the motor.

The performance of a permanent magnet in the permanent magnet motor is greatly reduced along with the rise of temperature, so that the demagnetization phenomenon occurs and the electromagnetic performance of the motor is influenced; the serious person can generate permanent demagnetization and cause the motor to be completely out of work, thereby seriously threatening the safe operation of the aircraft.

Therefore, research and development have advanced cooling system's stator module and motor to promoting unmanned aerial vehicle performance and reliability and have important meaning.

Disclosure of Invention

The invention mainly aims to provide a stator assembly with a heat dissipation effect, so that the stable temperature rise of a motor applying the technical scheme during operation is greatly reduced, and the power density and the reliability are greatly improved, so that the problem of insufficient payload of an unmanned aerial vehicle caused by overhigh temperature rise of the motor during operation and low power density of the motor in the prior art is solved, and the payload, the endurance time and the reliability of the unmanned aerial vehicle are improved.

The above object of the present invention is achieved by the following technical solutions:

a stator assembly comprises a stator core with a plurality of stator slots, wherein two layers of windings are arranged in each stator slot, a gap is formed between the two layers of windings, the stator assembly further comprises a heat dissipation part used for dissipating heat of the windings, the heat dissipation part comprises a heat pipe and a heat dissipation element, one end of the heat pipe is connected with the heat dissipation element, the other end of the heat pipe is inserted into the gap and is in heat conduction with the windings through contact, 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 pipe.

The beneficial effects of the above technical scheme are: through setting up heat pipe and radiating element, the leading-in heat pipe of the heat part that makes the winding produce, through the heat pipe again with the leading-in radiating element of heat, make heat diffusion to external atmosphere through radiating element, be favorable to the heat dissipation of winding, wherein the heat pipe tip can peg graft in the clearance, make radiating element can obtain the support through the heat pipe, improve radiating element's stability, and the heat conduction silicone grease of packing in the clearance can increase heat pipe and winding area of contact, further improve the efficiency of heat pipe and winding heat transfer, the heat conduction silicone grease has electrical insulation simultaneously, can electrical isolation heat pipe and winding, prevent that the winding electric leakage from taking place.

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 plates arranged at intervals, and the plurality of heat dissipation plates are provided with first connection portions for connecting the first heat pipe. The heat dissipation plate group is connected with the first heat pipe of the heat conduction pipe through the first connecting part, so that heat transfer is facilitated.

Preferably, the first connecting portion comprises a plurality of connecting pipes arranged on the radiating fins in a penetrating mode, through holes are formed in the connecting pipes, the first heat pipes are connected through the through holes in a plugging mode, and the connecting pipes are in heat conduction with the first heat pipes through contact. Insert a plurality of fin through the connecting pipe on, increase connecting pipe and a plurality of fin contact, make the connection of a plurality of fin more stable, the through-hole on the connecting pipe supplies first heat pipe to peg graft simultaneously, realizes the effective connection of a plurality of fin and first heat pipe, and can improve connection stability and heat transfer efficiency.

Preferably, first connecting portion include the connecting plate, a plurality of the fin sets up a side of connecting plate, the another side of connecting plate is equipped with the first adhesive linkage that is used for bonding first heat pipe, first adhesive linkage has the heat transfer to the connecting plate with first heat pipe. Through setting up a plurality of fin of connecting plate ability effective connection, first viscose layer on the connecting plate can bond first heat pipe simultaneously and increase both contact surfaces, realizes the effective connection of a plurality of fin and first heat pipe, makes both connect conveniently, and the heat-conduction of first adhesive linkage is favorable to improving the heat transfer efficiency of first heat pipe and connecting plate.

Preferably, the heat pipe further includes a second heat pipe, the heat dissipation element includes a bracket for supporting the stator core, the bracket is in interference fit with the installation through groove of the stator core, and the bracket is connected to the second heat pipe through a second connection portion. Through adopting above-mentioned structure, make the support can provide the heat dissipation for the winding, simultaneously through the second connecting portion, can improve the installation stability of second heat pipe.

Preferably, the second connecting portion include the rib of setting on the support, be equipped with the second adhesive linkage that is used for bonding the second heat pipe on the rib, the second adhesive linkage has on heat transfer to the rib with the second heat pipe. Through setting up the rib, on the one hand can increase the structural strength of support, and on the other hand can provide the effective position for being connected of second heat pipe and support, is convenient for through the connection of second adhesive linkage, increases both contact surfaces, and the heat-conduction of second adhesive linkage is favorable to improving the heat transfer efficiency of second heat pipe and support simultaneously.

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

Preferably, the first heat pipe is of an outward bending structure, the heat dissipation plate group connected with the first heat pipe is far away from the winding, the second heat pipe bends towards the support, and the bending angle of the first heat pipe and the second heat pipe is 80-100 degrees. By adopting the structure, the bent heat conduction pipe can support the heat dissipation element, thereby being beneficial to heat dissipation.

Preferably, the heat pipe is made of copper alloy, and the heat dissipation element is made of aluminum alloy. By adopting the heat conduction pipe made of copper alloy and the heat dissipation element made of aluminum alloy, the heat conduction performance can be improved while the cost is considered, the heat conduction of the winding is facilitated, and the heat dissipation is facilitated.

The invention also discloses a motor which comprises the stator component, the stable temperature rise of the motor with the stator component is greatly reduced during operation, and the power density and the reliability are greatly improved, so that the problem that the effective load of the unmanned aerial vehicle is insufficient due to overhigh temperature rise during operation and low power density of the motor in the prior art is solved, and the effective load, the endurance time and the reliability of the unmanned aerial vehicle are improved.

Drawings

Fig. 1 is an exploded view of a stator assembly according to a first embodiment;

fig. 2 is a schematic view of the overall structure of the stator assembly of the first embodiment;

fig. 3 is a schematic view of the overall structure of the motor according to the first embodiment;

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

FIG. 5 is a schematic diagram of a first heat pipe;

fig. 6 is a schematic structural view of a heat dissipation plate group according to a second embodiment;

description of reference numerals:

1. a stator core; 11. installing a through groove; 2. a winding; 3. a gap; 4. a heat dissipating section; 41. a heat conducting pipe; 411. a first heat pipe; 412. a second heat pipe; 413. bending angle; 42. a heat sink plate group; 421. a heat sink; 422. a connecting pipe; 4221. a through hole; 423. a connecting plate; 5. a support; 51. and (4) ribs.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Example one

As shown in fig. 1 to 5, the present invention provides a stator assembly, including a stator core 1 having 24 stator slots, where the stator core 1 is provided with a support 5 for supporting the stator core 1, the support 5 is in interference fit with an installation through slot 11 of the stator core 1, the support 5 is provided with a rib 51, each stator slot is provided with two layers of windings 2, a gap 3 is provided between the two layers of windings 2, the stator assembly further includes a heat dissipation portion 4 for dissipating heat of 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, where one end of each of the 18 first heat pipes 411 is connected with a heat dissipation plate group 42, and the other end of each of the 18 first heat pipes is inserted into the gap 3 of the corresponding stator slot, the heat dissipation plate groups 42 are uniformly distributed on the stator core 1 in a circumferential direction, one end of the remaining 6 second heat pipes 412 is connected with the rib 51 of the support 5, and the other end of the remaining 6 second heat pipes is inserted into the corresponding stator slot In the gap 3 of the stator slot, heat-conducting silicone grease for filling the gap 3 is arranged in the gap 3, and the heat-conducting silicone grease has adhesiveness, high heat conductivity and good insulating property after being solidified, so that the 24 heat-conducting pipes 41 are respectively and stably inserted into the gap 3 of the stator slot, and the heat-conducting silicone grease is used for transferring heat generated by the winding 2 to the heat-conducting pipes 41.

Specifically, the heat dissipation plate group 42 includes the fin 421 that a plurality of interval set up, a plurality of be equipped with on the fin 421 and be used for connecting the first connecting portion of first heat pipe 411, first connecting portion is including wearing to establish a plurality of connecting pipe 422 on the fin 421, be equipped with through-hole 4221 on the connecting pipe 422, through-hole 4221 supplies first heat pipe 411 pegs graft, connecting pipe 422 is heat-conduction through the contact with first heat pipe 411, be equipped with the heat conduction silicone grease that is used for transmitting heat between connecting pipe 422 and the first heat pipe 411.

In order to improve stator module's radiating effect, the material of heat pipe 41 is the copper alloy, the inner chamber of heat pipe 41 is equipped with the heat-conducting medium, the heat-conducting medium is water, the material of cooling plate group 42 is the aluminum alloy, the material of support 5 is the aluminum alloy, can improve the heat conductivility when taking into account the cost from this, does benefit to the heat conduction of winding 2, is convenient for dispel the heat.

The first heat pipe 411 is of an outward bending structure, the heat dissipation plate group 42 connected with the first heat pipe 411 is arranged far away from the winding 2, the second heat pipe 412 is bent towards the support 5, and the bending angle 413 of the first heat pipe 411 and the second heat pipe 412 is 90 degrees, so that the bending angle 413 is limited, the heat dissipation element is spread to the maximum extent, and the heat dissipation effect is improved.

The 6 second heat pipes 412 of the heat dissipation part 4 are connected to the ribs 51 of the bracket 5 through heat conductive silicone grease.

The invention also discloses a motor which comprises the stator component, wherein the motor is an outer rotor motor, the stable temperature rise of the motor with the stator component is greatly reduced during operation, and the power density and the reliability are greatly improved, so that the problem that the effective load of the unmanned aerial vehicle is insufficient due to overhigh operation temperature rise of the motor and low power density of the motor in the prior art is solved, and the effective load, the endurance time and the reliability of the unmanned aerial vehicle are improved.

Example two

As shown in fig. 6, the present embodiment is different from the first embodiment in that the first connection portion of the heat dissipation plate group 42 includes a connection plate 423, a plurality of heat dissipation plates 421 are disposed on one side surface of the connection plate 423, and the other side surface of the connection plate 423 is bonded to the first heat pipe 411 through a heat conductive silicone grease.

EXAMPLE III

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

Although the present disclosure has been described above, the scope 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 such changes and modifications will fall within the scope of the present invention.

Claims

1. The stator assembly comprises a stator core (1) with a plurality of stator slots, wherein two layers of windings (2) are arranged in each stator slot, and the stator assembly is characterized in that a gap (3) is formed between the two layers of windings (2), the stator assembly further comprises a heat dissipation part (4) for dissipating heat of the windings (2), the heat dissipation part (4) comprises a heat pipe (41) and a heat dissipation element, one end of the heat pipe (41) is connected with the heat dissipation element, the other end of the heat pipe (41) is inserted into the gap (3) and conducts heat with the windings (2) through contact, the gap (3) is filled with heat conduction silicone grease with electrical insulation, and the heat conduction silicone grease is used for transferring heat generated by the windings (2) to the heat pipe (41).

2. The stator assembly according to claim 1, characterized in that the heat conducting pipe (41) comprises a first heat pipe (411), the heat dissipating element comprises a heat dissipating plate group (42), the heat dissipating plate group (42) comprises a plurality of heat dissipating fins (421) arranged at intervals, and a first connecting portion for connecting the first heat pipe (411) is arranged on the plurality of heat dissipating fins (421).

3. The stator assembly according to claim 2, wherein the first connecting portion comprises a connecting pipe (422) penetrating through the plurality of heat dissipation fins (421), a through hole (4221) is formed in the connecting pipe (422), the first heat pipe (411) is inserted into the through hole (4221), and the connecting pipe (422) and the first heat pipe (411) conduct heat through contact.

4. The stator assembly according to claim 2, characterized in that the first connection part comprises a connection plate (423), a plurality of the heat dissipation fins (421) are arranged on one side of the connection plate (423), the other side of the connection plate (423) is provided with a first adhesive layer for adhering the first heat pipe (411), and the first adhesive layer has a function of transferring heat of the first heat pipe (411) to the connection plate (423).

5. The stator assembly according to any of the claims 1-4, characterized in that 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 fit in the mounting through slot (11) of the stator core (1), and the bracket (5) and the second heat pipe (412) are connected through a second connecting portion.

6. The stator assembly according to claim 5, characterized in that the second connecting part comprises a rib (51) arranged on the bracket (5), a second adhesive layer for adhering the second heat pipe (412) is arranged on the rib (51), and the second adhesive layer transfers the heat of the second heat pipe (412) to the rib (51).

7. The stator assembly according to claim 5, characterized in that the heat sink (4) comprises a plurality of first heat pipes (411) and second heat pipes (412), the plurality of first heat pipes (411) and second heat pipes (412) being evenly distributed over the stator core (1) in the circumferential direction.

8. The stator assembly according to claim 5, characterized in that the first heat pipe (411) is in an outward bending structure, the heat sink group (42) connected with the first heat pipe (411) is arranged far away from the winding (2), the second heat pipe (412) is bent towards 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, characterized in that the heat conducting pipes (41) are made of copper alloy and the heat dissipating elements are made of aluminum alloy.

10. An electrical machine comprising a stator assembly according to any of claims 1-9.