Outer rotor roller motor stator end winding heat dissipation structure

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a stator end winding heat dissipation structure of an outer rotor roller motor, which comprises a stator iron core, a winding wound on the stator iron core, a heat pipe used for transferring heat at the end of the winding to the stator iron core, and a cooling pipeline positioned on the inner side of the stator iron core, the heat pipe is in direct contact with the stator core and the winding end part and comprises an evaporation section and a condensation section; according to the utility model, the heat of the winding end part is efficiently transferred to the stator core by using the heat pipe, and the stator core is cooled by the cooling medium of the cooling pipeline, so that the heat dissipation efficiency of the winding end part is improved, and the overall heat of the motor is uniformly distributed.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a heat dissipation structure of a stator end winding of an outer rotor drum motor. Background Art

[0002] At present, in the field of outer rotor drum motors, there is no structural design for heat dissipation of the stator winding ends. The heat is mainly dissipated from the stator core and then the winding ends are dissipated by heat conduction. When heat is dissipated in this way, due to the thick insulation layer between the winding and the core, the thermal resistance is relatively large, and the winding ends are not in direct contact with the stator core and are completely exposed to the air. The heat is dissipated only by contact with the straight section of the winding. The heat dissipation efficiency is low, which can easily cause the end temperature to be too high, thereby causing insulation aging, reducing insulation strength, shortening equipment life, and causing equipment efficiency to decrease. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the problems that the end of the winding in the outer rotor drum motor in the prior art only dissipates heat by contact with the straight section of the winding, the heat dissipation efficiency is low, and the end temperature is easily caused to be too high, thereby causing insulation aging, reducing insulation strength, shortening equipment life, and causing equipment efficiency to decrease. A heat dissipation structure for the stator end winding of the outer rotor drum motor is now provided.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a heat dissipation structure of the stator end winding of an outer rotor drum motor, comprising a stator core, a winding wound on the stator core, a heat pipe for transferring the heat of the winding end to the stator core, and a cooling pipe located inside the stator core, wherein the cooling medium in the cooling pipe can be cold air or cooling water to achieve water cooling or air cooling, and the heat pipe is in direct contact with the stator core and the winding end and comprises an evaporation section and a condensation section;

[0005] The heat at the end of the winding is transferred to the evaporation section of the heat pipe through the wall of the heat pipe. The phase change medium in the evaporation section evaporates inside the heat pipe due to the heat. The evaporated gas inside the heat pipe is transferred to the condensation section of the heat pipe due to the slight pressure difference. The evaporated gas condenses in the condensation section and condenses into liquid, releasing heat. The liquid returns to the evaporation section under the action of capillary force along the porous structure, ultimately achieving the result of transferring the heat from the end of the winding to the stator core, and cooling the stator core by the cooling medium in the cooling pipe.

[0006] The above technical solution utilizes heat pipes to efficiently transfer the heat from the winding ends to the stator core, and cools the stator core through the cooling medium of the cooling pipe, thereby improving the heat dissipation efficiency of the winding ends and making the overall heat distribution of the motor uniform.

[0007] Furthermore, there are multiple heat pipes, and the multiple heat pipes are arranged at intervals along the circumferential direction of the stator core.

[0008] Furthermore, the evaporation section of each heat pipe extends circumferentially and contacts the end of the winding. The arc-shaped evaporation section can increase the contact area with the end of the winding and improve the heat transfer efficiency. Multiple evaporation sections are distributed at intervals and enclosed to form an annular structure. The condensation section of the heat pipe extends axially and is embedded in the stator core.

[0009] Furthermore, the stator core includes a plurality of clamped punching sheets, each of which includes a yoke portion close to the cooling pipe and a tooth portion located outside the yoke portion. The condensation section is embedded in the yoke portion, closer to the cooling pipe, thereby improving heat dissipation efficiency. At the same time, the condensation section is far away from the tooth portion and will not affect the magnetic circuit.

[0010] Furthermore, the evaporation section and the winding end are potted with insulating thermally conductive adhesive. During the potting process, it is necessary to ensure that the thermally conductive insulating adhesive can evenly cover the winding end to prevent the occurrence of voids and bubbles, thereby achieving good contact between the heat pipe and the winding end.

[0011] Furthermore, a connecting section is provided between the evaporation section and the condensation section, and there is a smooth transition between the two adjacent sections.

[0012] Furthermore, the multiple heat pipes are divided into two groups, the two groups of heat pipes correspond to the two ends of the winding one by one, and each group of heat pipes is used to transfer the heat of the corresponding winding end to the stator core.

[0013] Furthermore, the condensation section and the yoke are formed by pressing or welding.

[0014] Beneficial effects of the utility model: the utility model utilizes heat pipes to efficiently transfer heat from the winding ends to the stator core, and cools the stator core through the cooling medium of the cooling pipe, thereby improving the heat dissipation efficiency of the winding ends and making the overall heat distribution of the motor uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0018] Figure 3 This is a schematic diagram of the structure of the utility model potting insulation thermal conductive adhesive;

[0019] Figure 4 It is a cross-sectional view of the utility model;

[0020] Figure 5 It is a schematic diagram of the arrangement of a group of heat pipes;

[0021] Figure 6 It is a schematic diagram of the structure of the heat pipe;

[0022] In the figure:

[0023] 1. stator core; 101. punching sheet; 1011. yoke; 1012. tooth; 102. clamping part;

[0024] 2. Winding;

[0025] 3. heat pipe; 301. evaporation section; 302. condensation section; 303. connection section;

[0026] 4. Cooling pipe; 401. Heat sink;

[0027] 5. Insulating thermal conductive adhesive. DETAILED DESCRIPTION

[0028] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0029] Embodiment 1:

[0030] like Figure 1-Figure 5 As shown, the utility model is a heat dissipation structure of the stator end winding of an outer rotor drum motor, comprising a stator core 1, a winding 2 wound on the stator core 1, a heat pipe 3 for transferring heat from the end of the winding 2 to the stator core 1, and a cooling pipe 4 located on the inner side of the stator core 1, or the heat pipe 3 can also directly transfer the heat from the end of the winding 2 to the cooling pipe 4, a plurality of heat sinks 401 arranged at intervals are fixed in the cooling pipe 4 along the circumferential direction, and the cooling medium in the cooling pipe 4 can be cold air or cooling water to achieve water cooling or air cooling, and the heat pipe 3 is in direct contact with the stator core 1 and the end of the winding 2;

[0031] This embodiment is applicable to a motor with an outer rotor structure, that is, the rotor is located outside the stator. Therefore, the heat generated by the stator core 1 needs to be discharged through the cooling pipe 4 inside the stator core, and cannot be discharged through the outside. The heat at the end of the winding 2 group can be transferred to the stator core 1 through the heat pipe 3, and then transferred from the stator core 1 to the cooling pipe 4 to achieve heat dissipation at the end of the winding 2. The heat pipe 3 is arranged inside the motor and is not connected to the outside world, so it does not affect the closed structure of the motor, and thus does not affect the explosion-proof performance.

[0032] There are multiple heat pipes 3, and the multiple heat pipes 3 are divided into two groups. The two groups of heat pipes 3 correspond to the two ends of the winding 2 one by one, and each group of heat pipes 3 is used to transfer the heat of the corresponding end of the winding 2 to the stator core 1, and each group includes a plurality of heat pipes 3, and the plurality of heat pipes 3 are arranged at intervals along the circumference of the stator core 1; or the two groups of heat pipes can be combined into one group, that is, the two ends of each heat pipe 3 are respectively in contact with the two ends of the winding 2 to transfer heat. The structural form of the two groups of heat pipes is easier to install than the structural form of one group of heat pipes.

[0033] The evaporation section 301 of each heat pipe 3 extends in the circumferential direction and contacts the end of the winding 2. The arc-shaped evaporation section 301 can increase the contact area with the end of the winding 2 and improve the heat transfer efficiency. The multiple evaporation sections 301 are distributed at intervals and enclosed to form a ring structure.

[0034] The stator core 1 includes a plurality of punching sheets 101 that are clamped together, and adjacent punching sheets 101 are clamped together by clamping portions 102. The punching sheets 101 include a yoke 1011 close to the cooling pipe 4 and a tooth portion 1012 located outside the yoke 1011. The condensation section 302 of the heat pipe 3 extends axially and is embedded in the yoke 1011. The yoke 1011 is provided with a mounting hole for the condensation section 302 to be embedded. The mounting hole does not affect the magnetic conductivity of the stator core and the inner wall is smooth, thereby ensuring a tight connection with the heat pipe 3. The yoke 1011 and the condensation section 302 can be pressed or welded, so the condensation section 302 is located closer to the cooling pipe 4, thereby improving the heat dissipation efficiency. At the same time, the condensation section 302 is away from the tooth portion 1012 and does not affect the magnetic circuit. A connecting section 303 is provided between the evaporation section 301 and the condensation section 302, and there is a smooth transition between the two adjacent sections.

[0035] The evaporation section 301 and the end of the winding 2 are potted with an insulating thermally conductive adhesive 5. During the potting process, it is necessary to ensure that the thermally conductive insulating adhesive can evenly cover the end of the winding 2 to prevent the occurrence of voids and bubbles, thereby achieving good contact between the heat pipe 3 and the end of the winding 2.

[0036] Working principle:

[0037] The heat at the end of the winding 2 is transferred to the evaporation section 301 of the heat pipe 3 through the wall of the heat pipe 3. The phase change medium in the evaporation section 301 evaporates inside the heat pipe 3 due to the heat. The evaporated gas in the heat pipe 3 is transferred to the condensation section 302 of the heat pipe 3 due to the slight pressure difference. The evaporated gas condenses in the condensation section 302 and condenses into liquid, releasing heat. The liquid returns to the evaporation section 301 under the action of the capillary force along the porous structure, and finally the heat at the end of the winding 2 is transferred to the stator core 1, and the stator core 1 is cooled by the cooling medium of the cooling pipe 4.

[0038] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A heat dissipation structure for the stator end winding of an outer rotor drum motor, characterized in that: It comprises a stator core (1), a winding (2) wound on the stator core (1), a heat pipe (3) used to transfer heat from the end of the winding (2) to the stator core (1), and a cooling pipe (4) located inside the stator core (1).

2. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 1 is characterized in that: There are a plurality of heat pipes (3), and the plurality of heat pipes (3) are arranged at intervals along the circumferential direction of the stator core (1).

3. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 2, characterized in that: The evaporation section (301) of each heat pipe (3) extends in the circumferential direction and contacts the end of the winding (2); a plurality of evaporation sections (301) are spaced and arranged to form an annular structure; and the condensation section (302) of the heat pipe (3) extends in the axial direction and is embedded in the stator core (1).

4. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 3 is characterized in that: The stator core (1) comprises a plurality of clamped punching sheets (101), wherein the punching sheets (101) comprise a yoke (1011) close to the cooling pipe (4) and a tooth portion (1012) located outside the yoke (1011), and the condensation section (302) is embedded in the yoke (1011).

5. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 3, characterized in that: The evaporation section (301) and the end of the winding (2) are potted with an insulating heat-conducting adhesive (5).

6. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 3, characterized in that: A connecting section (303) is provided between the evaporation section (301) and the condensation section (302), and a smooth transition is provided between the two adjacent sections.

7. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 2, characterized in that: The plurality of heat pipes (3) are divided into two groups, the two groups of heat pipes (3) correspond one to one to the two ends of the winding (2), and each group of heat pipes (3) is used to transfer the heat of the corresponding end of the winding (2) to the stator core (1).

8. The heat dissipation structure of the stator end winding of an outer rotor drum motor according to claim 4, characterized in that: The condensation section (302) and the yoke (1011) are formed by pressing or welding.

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