Totally enclosed motor with thermally conductive slot wedge

Abstract

The totally-enclosed motor with heat-conducting slot wedge comprises a stator core, a rotor and a casing, the casing has end covers at two ends, the stator core comprises teeth (1) and a yoke (2), the teeth are provided with coils (3), the teeth are provided with heat-conducting slot wedges (4), the middle part of the heat-conducting slot wedges (4) is attached to the coils (3) on the two sides of the teeth (1), the end part of the heat-conducting slot wedges (4) protrudes from the end face of the teeth (1) and the coils (3), and the end face of the two ends of the heat-conducting slot wedges (4) is attached to the end covers on the two sides of the casing. The totally-enclosed motor with heat-conducting slot wedge is closely attached to the coils, the teeth, the yoke and the end covers, the heat on the coils is respectively transmitted to the end covers and the stator core through the ceramic slot wedges with insulation and high heat-conducting performance, the heat dissipation channel of the end covers is increased, the heat dissipation inside the motor is improved through multiple heat dissipation channels, and the structural strength inside the motor is improved through the ceramic slot wedges.

Description

Technical Field

[0001] This utility model relates to electric motors, specifically to a fully enclosed electric motor with heat-conducting groove wedges. Background Technology

[0002] Open-type motors facilitate stator heat dissipation, but their open structure is susceptible to damage from external rain and dust, leading to reduced reliability. In contrast, enclosed motors offer higher reliability, but face the challenge of difficult internal heat dissipation. Patent applications CN118713385A and CN117543902A disclose a fully enclosed external rotor motor that uses heat pipes to transfer internal heat to a central cavity for cooling; however, this design is complex and difficult to manufacture. Summary of the Invention

[0003] The purpose of this invention is to provide a motor with a heat-conducting groove wedge to solve the problem of heat dissipation difficulties inside a fully enclosed motor.

[0004] To achieve the aforementioned objectives, the technical solution of this utility model is as follows: A fully enclosed motor with heat-conducting slot wedges, which can be an external rotor motor or an internal rotor motor. It includes a stator core, a rotor, and a housing. The housing has end caps at both ends. The stator core includes teeth and a yoke, with coils on the teeth. Heat-conducting slot wedges are located between the teeth, with the middle of the wedges contacting the coils on the teeth on both sides. The ends of the wedges extend beyond the end faces of the teeth and coils. During assembly, the end faces of the heat-conducting slot wedges abut against the end caps on both sides of the housing, and are axially locked by the end caps at the front and rear of the motor.

[0005] Furthermore, the teeth are dovetail teeth, and the beginning and end of the heat-conducting groove wedge are respectively attached to the yoke and the teeth.

[0006] Furthermore, a heat-spreading plate is placed between the end of the heat-conducting groove wedge and the end cap.

[0007] Furthermore, the coil is formed by winding copper or aluminum flat wire vertically around the teeth. The turns in the coil are perpendicular to the teeth, and the two narrow sides of the turns between the teeth are in contact with the heat-conducting groove wedge and the teeth, respectively. The aluminum flat wire is ceramic-insulated aluminum flat wire, and the surface of the ceramic-insulated aluminum flat wire has a ceramic insulating film layer with aluminum oxide as the main component, which is generated by thermoelectrochemical oxidation treatment.

[0008] Furthermore, the heat-conducting groove wedge is a ceramic groove wedge, and the material of the ceramic groove wedge is diamond, beryllium oxide, aluminum nitride, silicon carbide or silicon nitride.

[0009] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This invention relates to a fully enclosed motor with heat-conducting slot wedges. The heat-conducting slot wedges are in close contact with the coil, teeth, yoke, and end cover. The ceramic slot wedges, which have insulating and high thermal conductivity, transfer heat from the coil to the end cover and stator core, respectively, increasing the heat dissipation channel at the end cover and thus improving internal heat dissipation through multiple channels. Simultaneously, the ceramic slot wedges also enhance the structural strength of the motor's internal structure. The design is simple, ingenious, and easy to implement. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the stator structure of the fully enclosed external rotor motor in Embodiment 1 of this utility model.

[0011] Figure 2 This is a top view of the stator structure of the fully enclosed external rotor motor in Embodiment 1 of this utility model.

[0012] Figure 3 This is a schematic diagram of the stator structure of the fully enclosed internal rotor motor in Embodiment 2 of this utility model.

[0013] Figure 4 This is a top view of the stator structure of the fully enclosed inner and outer rotor motor in Embodiment 2 of this utility model. Detailed Implementation Example 1

[0014] like Figure 1 and 2 As shown, a fully enclosed external rotor motor includes a stator core, a rotor, and a housing (the rotor and housing are not shown; for details, refer to the fully enclosed external rotor motors disclosed in patent applications CN118713385A, CN119483122A, or CN117543902A). The housing has end caps at both ends. The stator core includes teeth 1 and a yoke 2, with coils 3 on the teeth 1. Heat-conducting slot wedges 4 are located between the teeth 1, with the middle of the slot wedges 4 abutting against the coils 3 on both sides of the teeth 1. Axially, the length of the heat-conducting slot wedges 4 exceeds the ends of the teeth 1 and coils 3. When the motor is installed, the end faces of the heat-conducting slot wedges 4 abut against the end caps on both sides of the housing, and the axial direction of the heat-conducting slot wedges 4 is locked by the end caps at the front and rear of the motor. A heat-spreading plate can also be placed between the ends of the heat-conducting slot wedges 4 and the end caps to enhance heat conduction. The heat-conducting slot wedges 4 are aluminum nitride ceramic slot wedges with high insulation and high thermal conductivity. Tooth 1 is a dovetail tooth, and the beginning and end parts of the heat-conducting groove wedge 4 are respectively attached to yoke 2 and tooth 1.

[0015] Coil 3 is formed by vertically winding copper flat wire around tooth 1. The turns of coil 3 are perpendicular to tooth 1, and the two narrow sides of the turns between teeth 1 are in contact with the heat-conducting slot wedge 4 and tooth 1, respectively. Each turn of coil 3 can dissipate heat through the stator core and the heat-conducting slot wedge 4. The aluminum flat wire is ceramic-insulated aluminum flat wire, and the surface of the ceramic-insulated aluminum flat wire has a ceramic insulating film layer formed by thermoelectrochemical oxidation treatment.

[0016] In the circumferential direction of the motor, the heat-conducting groove wedge 4 fills the space between tooth 1, yoke 2, and coil 3. In the axial direction of the motor, the heat-conducting groove wedge 4 abuts against the end cover. In addition to conducting heat, the heat-conducting groove wedge 4 also serves as internal support. Example 2

[0017] like Figure 3 and 4 As shown, a fully enclosed inner rotor motor has a stator that is basically the same as the stator of the outer rotor motor in Embodiment 1. The only difference is the relative position of the teeth and yoke and the details of the head and tail structure of the heat-conducting groove wedge, which are adjusted according to conventional design.

Claims

1. A fully enclosed motor with heat-conducting slot wedges, comprising a stator core, a rotor, and a housing, wherein the housing has end caps at both ends, and the stator core comprises teeth (1) and a yoke (2), wherein the teeth (1) have coils (3), characterized in that, There is a heat-conducting groove wedge (4) between the teeth (1). The middle part of the heat-conducting groove wedge (4) is in contact with the coil (3) on both sides of the teeth (1). The end of the heat-conducting groove wedge (4) extends out of the end face of the teeth (1) and the coil (3). The end faces of both ends of the heat-conducting groove wedge (4) abut against the end covers on both sides of the housing.

2. The fully enclosed motor with heat-conducting groove wedge according to claim 1, characterized in that, The tooth (1) is a dovetail tooth, and the beginning and end of the heat-conducting groove wedge (4) are respectively attached to the yoke (2) and the tooth (1).

3. The fully enclosed motor with heat-conducting groove wedge according to claim 1, characterized in that, A heat-spreading plate is also placed between the end of the heat-conducting groove wedge (4) and the end cover.

4. The fully enclosed motor with heat-conducting groove wedge according to claim 1, characterized in that, The coil (3) is formed by winding a flat wire around the tooth (1) in a vertical manner, with the coil turns perpendicular to the tooth (1).

5. The fully enclosed motor with heat-conducting groove wedge according to claim 4, characterized in that, Flat wire can be either copper flat wire or aluminum flat wire.

6. The fully enclosed motor with heat-conducting groove wedge according to claim 5, characterized in that, The aluminum flat wire is a ceramic insulated aluminum flat wire, and the surface of the ceramic insulated aluminum flat wire has a ceramic insulating film layer formed by thermo-electrochemical oxidation treatment.

7. The fully enclosed motor with heat-conducting groove wedge according to claim 4, characterized in that, The two narrow sides of the inter-tooth (1) wire loop are respectively attached to the heat-conducting groove wedge (4) and the tooth (1).

8. The fully enclosed motor with heat-conducting groove wedge according to claim 1, characterized in that, The motor is either an external rotor motor or an internal rotor motor.

9. The fully enclosed motor with heat-conducting groove wedge according to any one of claims 1-8, characterized in that, The heat-conducting groove wedge (4) is a ceramic groove wedge.

10. The fully enclosed motor with heat-conducting groove wedge according to claim 9, characterized in that, The ceramic groove wedge is made of diamond, beryllium oxide, aluminum nitride, silicon carbide, or silicon nitride.

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