Rotor heat dissipation structure of an internal rotor motor

Abstract

The application provides a rotor heat dissipation structure of an inner rotor motor, and relates to the field of inner rotor motor heat dissipation. The mechanism comprises a circuit rotating connector, a motor rotor heat dissipation frame and a mounting groove baffle. The outer circumferential surface of the motor rotor heat dissipation frame is fixedly connected with a motor rotor lamination assembly, and the inner circumferential surface is fixedly connected with a motor shaft. The motor shaft is fixedly connected with a motor stator end cover after penetrating through the center of the circuit rotating connector. The two sides of the circuit rotating connector are connected with the motor rotor heat dissipation frame and the motor stator end cover through key groove cooperation. A plurality of thermoelectric refrigeration piece mounting grooves are uniformly arranged on the axial end face of one end of the motor rotor heat dissipation frame in the circumferential direction to mount thermoelectric refrigeration pieces. The output lead wires of the thermoelectric refrigeration pieces are connected with the outside through the wiring ports of the circuit rotating connector and the lead wire ends of the motor stator end cover. The mechanism can directly dissipate heat for the motor rotor in rotary motion, and improves the reliability and output power of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inner rotor motor heat dissipation, and particularly relates to a rotor heat dissipation structure of an inner rotor motor. BACKGROUND

[0002] An inner rotor permanent magnet motor (hereinafter referred to as a motor) mainly comprises a stator, a rotor, a shell, a shaft and other main components. In order to improve the power density of the motor, the current density of the motor winding needs to be increased, which leads to an increase in the heat generated by the motor. Therefore, a water (or liquid cooling) cooling method is usually used to improve the heat dissipation efficiency, so as to maximize the reduction of the temperature of the motor and maximize the power density of the motor. The current motor water cooling (or liquid cooling) structure mainly comprises a single-path series or multi-path parallel water channel (such as an S-shaped water channel, a spiral water channel, a double-spiral water channel, etc.) processed on the inner wall of the motor shell, so that the cooling water passes through the water channel to take away the heat of the motor shell (i.e. the stator winding), thereby achieving the purpose of cooling and dissipating heat of the motor. The motor stator water cooling and heat dissipation method is shown in FIG. 1. Figure 1 In the stator water cooling and heat dissipation method, the heat exchange contact surface is arranged on the outermost side of the motor, and cannot dissipate heat of the rotating motor rotor. Therefore, only the heat on the surface of the motor stator in a stationary state can be taken away. The main heat generating part of a motor with high power density is usually located in the motor rotor, and the heat generated by the motor rotor is more serious, especially under the working condition of high-speed operation of the motor. The heat dissipation method of increasing the cooling water channel on the outside of the motor shell is difficult to take away the heat of the motor rotor, thereby greatly limiting the improvement of the power density of the motor and the working effect of high-speed operation. SUMMARY

[0003] The purpose of the present application is to solve the problem of heat dissipation of the motor rotor, improve the heat dissipation efficiency of the motor, and further improve the power density, working characteristics, reliability and other performances of the motor. The present application provides a rotor heat dissipation structure of an inner rotor motor, which mainly adopts a thermoelectric refrigeration sheet capable of refrigeration and cooling by itself under a given current, which is uniformly embedded in the inside of the motor rotor heat dissipation frame. The heat dissipation and cooling of the motor rotor are achieved by direct surface contact heat exchange with the motor rotor body, and the power supply connection between the thermoelectric refrigeration sheet and the outside of the motor is realized by using a circuit rotary connector.

[0004] The present application comprises: a circuit rotary connector, a motor rotor heat dissipation frame, a thermoelectric refrigeration sheet, and a mounting groove baffle.

[0005] The outer circumferential surface of the motor rotor heat dissipation frame is connected with the motor rotor lamination assembly, and the inner circumferential surface is connected with the motor shaft. The axial end surface of one end of the motor rotor heat dissipation frame is connected with one side of the circuit rotary connector, and the other side of the circuit rotary connector is connected with the motor stator end cover. The outer end of the motor shaft is connected with the motor stator end cover.

[0006] The motor rotor heat dissipation frame is connected with the axial end surface of one side of the circuit rotating connector, and a plurality of thermoelectric refrigeration piece mounting grooves are uniformly arranged in the circumferential direction of the axial end surface.

[0007] The lead wire of the thermoelectric refrigeration piece is passed through the wire hole of the mounting groove baffle, and is connected with the wire connection port of the corresponding position of the rotating inner ring of the circuit rotating connector.

[0008] As a preferred mode of the present application, the bottom of the thermoelectric refrigeration piece mounting groove is provided with an air vent hole.

[0009] As a preferred mode of the present application, the mounting groove baffle is mounted on the axial end surface of the motor rotor heat dissipation frame connected with the circuit rotating connector by means of a countersunk bolt.

[0010] As a preferred mode of the present application, the motor stator end cover is provided with a bearing, and the outer end surface of the motor shaft is fixedly connected with the inner ring of the bearing.

[0011] As a preferred mode of the present application, the circuit rotating connector comprises an outer ring and an inner ring, the inner ring is provided with an inner ring limiting key, the outer ring is provided with an outer ring limiting key, the axial end surface of the motor rotor heat dissipation frame connected with the circuit rotating connector is provided with an inner ring key groove matched with the inner ring limiting key, and the inner side surface of the motor stator end cover is provided with an outer ring key groove matched with the outer ring limiting key.

[0012] Advantages:

[0013] (1) The motor rotor heat dissipation frame is used as a motor rotor support, and the thermoelectric refrigeration pieces capable of refrigeration and cooling by themselves through a given current are uniformly embedded in the motor rotor support. The refrigeration capacity of the thermoelectric refrigeration pieces can be adjusted by the current size. According to the actual operation of the motor, a corresponding number of thermoelectric refrigeration pieces are selected, and the working current of the thermoelectric refrigeration pieces is adjusted to realize step-by-step adjustment of the heat dissipation capacity, and the effect of directly dissipating heat for the rotating motor rotor.

[0014] (2) The bottom of the refrigeration piece mounting groove of the motor rotor heat dissipation frame is provided with an air vent hole, which ensures the air-free filling of the heat-conducting silicone grease and ensures the full contact of the thermoelectric refrigeration piece and the heat-conducting silicone grease.

[0015] (3) The number of countersunk bolts on each mounting groove baffle can be adjusted to realize the adjustment of the dynamic balance of the motor rotor.

[0016] (4) The circuit rotary connector adopted by the present application is divided into an inner ring and an outer ring, the thermoelectric refrigeration piece lead is connected with the wiring port of the inner ring first, and then connected with the output lead of the outer ring and the external cable, so that the rotation of the motor and the electrical connection of the thermoelectric refrigeration piece do not hinder each other. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The present application provides a motor stator water cooling heat dissipation mode schematic diagram in the prior art described in the background art;

[0018] Figure 2 The present application provides a whole connection schematic diagram;

[0019] Figure 3 The present application provides a motor rotor heat dissipation frame, a motor rotor lamination assembly and a motor shaft connection schematic diagram;

[0020] Figure 4 The present application provides a schematic diagram of installing a thermoelectric refrigeration piece on a motor rotor heat dissipation frame;

[0021] Figure 5 The present application provides a schematic diagram of a circuit rotary connector;

[0022] Figure 6 The present application provides a schematic diagram of a motor rotor heat dissipation frame;

[0023] Figure 7 The present application provides a schematic diagram of a motor stator end cover;

[0024] Figure 8 The present application provides a schematic diagram of installing a circuit rotary connector;

[0025] Figure 9 The present application provides a schematic diagram of installing a lead;

[0026] Wherein: 1 - motor stator shell; 2 - motor rotor lamination assembly; 3 - circuit rotary connector output lead; 4 - circuit rotary connector; 5 - motor rotor heat dissipation frame; 6 - motor shaft; 7 - motor stator end cover; 8 - motor lead end; 9 - thermoelectric refrigeration piece; 10 - thermoelectric refrigeration piece lead; 11 - thermoelectric refrigeration piece installation groove; 12 - air release through hole; 13 - installation groove baffle; 14 - countersunk bolt; 15 - inner ring; 16 - wiring port; 17 - inner ring limiting key; 18 - inner ring key groove; 20 - outer ring key groove; 21 - outer ring; 22 - outer ring limiting key; 23 - threading hole. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in combination with the drawings and examples.

[0028] The rotor heat dissipation structure of the inner rotor motor provided by the present embodiment comprises: a circuit rotary connector 4, a motor rotor heat dissipation frame 5, a thermoelectric refrigeration piece 9 and an installation groove baffle 13.

[0029] Referring to the drawings Figure 2 and the drawings Figure 3 , the heat dissipation structure is installed inside the inner rotor motor, in the motor stator shell 1, the motor rotor heat dissipation frame 5 outer circumferential surface and motor rotor lamination assembly 2 solid connection (in this case the motor rotor heat dissipation frame 5 and motor rotor lamination assembly 2 key groove to achieve the solid connection of both), while the motor rotor heat dissipation frame 5 to the motor rotor plays a supporting role, motor shaft 6 coaxially connected in the center hole of the motor rotor heat dissipation frame 5, the axial end surface of the motor rotor heat dissipation frame 5 one end of the circumferential uniform setting of a plurality of thermoelectric refrigeration piece installation groove 11 (in this embodiment, 8 are used); Referring to the drawings Figure 4 , in the axial end surface of the motor rotor heat dissipation frame the other end of each thermoelectric refrigeration installation groove 11 is provided with an air release hole 12, before installing the thermoelectric refrigeration piece 9, need to first in the thermoelectric refrigeration installation groove 11 filled with high thermal conductivity of the heat conduction silicone grease, and then the thermoelectric refrigeration piece 9 is inserted into the thermoelectric refrigeration installation groove, ensure that the air release hole 12 has heat conduction silicone grease overflow, then clean the overflow of the heat conduction silicone grease, ensure that each thermoelectric refrigeration installation groove 11 filled with heat conduction silicone grease. By changing the working current of the thermoelectric refrigeration piece 9 can adjust its working time of the refrigeration capacity, according to the actual operation of the motor set the corresponding number of thermoelectric refrigeration piece 9 and adjust the working current of the thermoelectric refrigeration piece 9. Then the thermoelectric refrigeration piece lead 10 through the installation groove baffle 13 through the wire hole 23, through the countersunk head bolt 14 is fixed in the axial end surface of the motor rotor heat dissipation frame 5 installation groove baffle 13, so that the installation groove baffle 13 to the thermoelectric refrigeration piece 9 compression fixed, and can be adjusted by the number of each installation groove baffle 13 on the countersunk head bolt 14 to adjust the motor rotor dynamic balance.

[0030] Referring to the drawings Figures 5-9When the thermoelectric refrigeration piece 9 is installed on the motor rotor heat dissipation frame 5, the thermoelectric refrigeration piece lead 10 is connected to the corresponding wire port 16 on the rotating inner ring 15 of the circuit rotating connector 4, and the insulation and reinforcement of each cable group are processed outside to prevent the contact and friction of each cable group with other motor components. Then, the inner ring limiting key 17 provided on the inner ring 15 of the circuit rotating connector 4 is inserted into the inner ring key groove 18 installed on the corresponding position of the motor rotor heat dissipation frame 5, so that the circuit rotating connector 4 is installed on the motor rotor heat dissipation frame 5, and then fixed by screwing. Finally, the outer ring limiting key 22 of the outer ring 21 of the circuit rotating connector 4 is inserted into the outer ring key groove 20 of the motor stator end cover 7, the circuit rotating connector output lead 3 is connected to the cable outside the motor through the motor lead end 8 on the motor stator end cover 7, so that the circuit rotating connector 4 is installed on the motor stator end cover 7, and finally the motor stator end cover 7 is installed and fastened on the motor stator shell 1 by bolts; a bearing is provided on the inner side surface center of the motor stator end cover 7, and the motor shaft 6 passes through the middle of the circuit rotating connector 4 and is fixed to the inner ring of the bearing.

[0031] Although the present application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of the present application claimed.

Claims

1. A rotor heat dissipation structure for an internal rotor motor, characterized in that, Include: Circuit rotating connector, motor rotor heat dissipation frame, thermoelectric refrigeration piece, mounting groove baffle; The circuit rotating connector includes an outer ring and an inner ring, the inner ring is provided with an inner ring limiting key, the outer ring is provided with an outer ring limiting key, the motor rotor heat dissipation frame is connected to the axial end surface of one side of the circuit rotating connector, and the inner ring key groove for cooperating with the inner ring limiting key is arranged; The inner side surface of the motor stator end cover is provided with an outer ring key groove for cooperating with the outer ring limiting key; The outer circumferential surface of the motor rotor heat dissipation frame is connected with the motor rotor lamination assembly, the inner circumferential surface is connected with the motor shaft, the axial end surface of one end of the motor rotor heat dissipation frame is connected with one side of the circuit rotating connector, the other side of the circuit rotating connector is connected with the motor stator end cover, and the outer end of the motor shaft is connected with the motor stator end cover; The motor rotor heat dissipation frame is connected to the axial end surface of one side of the circuit rotating connector, and a plurality of thermoelectric refrigeration piece mounting grooves are uniformly arranged along the circumference; The thermoelectric refrigeration piece is fixedly installed in the thermoelectric refrigeration piece mounting groove through the mounting groove baffle; The lead of the thermoelectric refrigeration piece is connected with the wiring port corresponding to the rotating inner ring of the circuit rotating connector through the threading hole of the mounting groove baffle, and the output lead of the circuit rotating connector is connected with the cable outside the motor through the motor lead end of the motor stator end cover.

2. A rotor heat dissipation structure of an internal rotor motor according to claim 1, wherein The bottom of the thermoelectric refrigeration piece mounting groove is provided with an air release hole.

3. A rotor heat sink structure for an internal rotor electric machine as defined in claim 1, characterized by The mounting groove baffle is installed on the axial end surface of one side of the circuit rotating connector connected with the motor rotor heat dissipation frame through a countersunk head bolt.

4. A rotor heat sink structure for an internal rotor electric machine according to claim 1, characterized by The motor stator end cover is provided with a bearing in the center, and the outer end surface of the motor shaft is fixedly connected with the inner ring of the bearing.

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