A rotor shaft of a permanent magnet motor with a built-in micro heat pipe radiator

Abstract

This utility model relates to the field of permanent magnet motor rotor shaft heat dissipation, and discloses a permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation. It includes a motor shaft and a rotor core fixed to the outer wall of the motor shaft. The motor shaft passes through the interior of the rotor core and cooperates with a mounting groove on the surface of the rotor core. A heat dissipation assembly is provided inside the rotor core, including a heat pipe and a mounting hole for accommodating the heat pipe. A portion of the heat pipe is located inside the mounting hole. Heat dissipation holes and rotor ventilation slots are formed inside the rotor core. In this utility model, a built-in copper heat pipe is directly embedded inside the rotor core. Utilizing the high thermal conductivity of the heat pipe, heat is rapidly transferred from the rotor core to the ventilation slot. The ventilation slot guides airflow to directionally scour the surface of the heat pipe, and the heat pipe releases heat within the rotor ventilation slot, helping to release internal heat from the rotor core and improving heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation of permanent magnet motor rotor shafts, and more particularly to a permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation. Background Technology

[0002] An electric motor is essentially a metal product with high thermal conductivity. Common small-power motors rely on their own thermal conductivity to conduct heat to the surface of the casing, and then the heat is carried away by air convection in contact with the surface to achieve heat dissipation. Alternatively, a fan can be installed at the rear of the motor to force airflow onto the motor body to increase heat dissipation. This heat dissipation method is called air cooling. When air cooling is no longer sufficient for ultra-high-power motors, my country's pioneering dual-water internal cooling technology involves pre-embedding pipes inside the motor and introducing water into the pipes for circulation. The heat is carried away by the water flow. It has a large heat dissipation capacity and a very good effect, but the structure is too complex and can only be applied to large and super-large motors. Currently, the heat dissipation of motor products mainly includes air cooling and water cooling.

[0003] Air-cooled heat dissipation methods share a common principle: heat dissipation relies entirely on the outer surface of the motor. The heat generated inside the motor, such as the rotor, must first be conducted through the internal air to the inner surface of the stator, and then from the stator to the outer surface of the motor to achieve heat dissipation. However, the motor stator itself is also a major heat source in the motor, and its own heat dissipation is inherently difficult. In some special cases, such as inside a car engine compartment, due to the severe heat generated by the engine, the temperature near the car engine can reach over 120 degrees Celsius in the summer. In such cases, the temperature inside the rotor may reach over 200 degrees Celsius, making it even more difficult to help dissipate heat from the rotor. To address this issue, a permanent magnet motor rotor shaft with built-in micro heat pipe cooling is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation, which aims to improve the problem in the prior art that "the rotor shaft is located inside the stator, and the heat dissipation efficiency is limited by the ambient temperature and airflow speed, which makes heat dissipation difficult".

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation, comprising a motor shaft and a rotor core fixed to the outer wall of the motor shaft. The motor shaft passes through the interior of the rotor core and cooperates with the mounting groove on the surface of the rotor core. A heat dissipation assembly is provided inside the rotor core. The heat dissipation assembly includes a heat pipe and a mounting hole for accommodating the heat pipe. A portion of the heat pipe is located inside the mounting hole. A heat dissipation hole is opened inside the rotor core. A rotor ventilation groove is opened inside the rotor core. Another portion of the heat pipe is located inside the rotor ventilation groove.

[0006] As a further description of the above technical solution: The central axis of the motor shaft coincides with the central axis of the rotor core.

[0007] As a further description of the above technical solution: A protrusion is fixedly connected to the outer wall of the motor shaft, and an inner groove that cooperates with the protrusion is provided on the inner wall of the rotor core.

[0008] As a further description of the above technical solution: The cross-section of the protrusion is rectangular, and the outer wall of the protrusion fits against the inner wall of the groove.

[0009] As a further description of the above technical solution: The surface of the rotor core is provided with rotor winding grooves.

[0010] As a further description of the above technical solution: The heat pipe is made of copper and is shaped like a square.

[0011] As a further description of the above technical solution: The heat dissipation hole has a V-shaped cross-section, and the rotor ventilation slot has an elliptical cross-section.

[0012] As a further description of the above technical solution: The heat pipe has no contact with the inner wall of the rotor ventilation slot.

[0013] This utility model has the following beneficial effects: 1. In this utility model, a built-in copper heat pipe is directly embedded inside the rotor core. By utilizing the high thermal conductivity of the heat pipe, heat is quickly transferred from the rotor core to the ventilation slot. The ventilation slot guides the airflow to directionally scour the surface of the heat pipe. The heat pipe releases heat within the rotor ventilation slot, helping to release internal heat from the rotor core and improving heat dissipation efficiency.

[0014] 2. In this utility model, by embedding the heat pipe into the rotor core mounting hole, the outer diameter of the motor is not increased. The V-shaped cross-section of the heat dissipation hole and the elliptical cross-section of the rotor ventilation groove help to form an air flow channel, promote heat dissipation, thereby reducing the temperature of the rotor core and improving the operating efficiency and reliability of the motor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a right-side view of the overall three-dimensional structure of this utility model; Figure 3This is a schematic diagram of the overall three-dimensional disassembled structure of this utility model; Figure 4 This is a three-dimensional disassembled structural diagram of the rotor core and heat pipe in this utility model.

[0016] Legend: 11. Motor shaft; 12. Protrusion; 21. Rotor core; 22. Rotor winding groove; 23. Inner groove; 24. Mounting groove; 3. Heat dissipation assembly; 31. Heat pipe; 32. Mounting hole; 33. Heat dissipation hole; 34. Rotor ventilation groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation, including a motor shaft 11 and a rotor core 21 fixed on the outer wall of the motor shaft 11. The central axis of the motor shaft 11 and the central axis of the rotor core 21 coincide to ensure the balance and stability of the rotor core 21 during operation. The motor shaft 11 passes through the interior of the rotor core 21 and cooperates with the mounting groove 24 on the surface of the rotor core 21. The surface of the rotor core 21 is provided with a rotor winding groove 22, which is used to embed permanent magnets or motor winding coils, providing installation space for permanent magnets or coil windings, forming the magnetic field of the motor, and indirectly participating in the rapid heat dissipation.

[0019] Reference Figures 1-3 A protrusion 12 is fixedly connected to the outer wall of the motor shaft 11. An inner groove 23 that cooperates with the protrusion 12 is provided on the inner wall of the rotor core 21. The cross-section of the protrusion 12 is set to be rectangular. The outer wall of the protrusion 12 fits against the inner wall of the inner groove 23. Through the tight fit between the rectangular cross-section of the protrusion 12 and the inner wall of the inner groove 23, the rotor core 21 and the motor shaft 11 are fixed axially and radially. A heat dissipation component 3 is provided inside the rotor core 21. The heat dissipation component 3 is used to dissipate the heat generated during the operation of the generator.

[0020] Reference Figure 3 and Figure 4The heat dissipation component 3 includes a heat pipe 31 and a mounting hole 32 for accommodating the heat pipe 31. The heat pipe 31 is made of copper and is U-shaped. A portion of the heat pipe 31 is located inside the mounting hole 32 and is in direct contact with the rotor core 21. By utilizing the high thermal conductivity of copper and the U-shaped structure, the heat conduction path is maximized, and the heat inside the rotor core 21 is quickly transferred to the rotor ventilation slot 34. The rotor core 21 has heat dissipation holes 33 inside. The cross-section of the heat dissipation holes 33 is set to V-shape. The V-shaped cross-section increases the heat dissipation area, guides the airflow along the inclined surface, enhances the convective heat dissipation efficiency, and directly dissipates the heat on the surface of the rotor core 21 to the internal space of the motor.

[0021] Reference Figure 3 and Figure 4 The rotor core 21 has a rotor ventilation slot 34 inside. The cross-section of the rotor ventilation slot 34 is set to elliptical. Another part of the heat pipe 31 is located inside the rotor ventilation slot 34. The heat pipe 31 has no contact relationship with the inner wall of the rotor ventilation slot 34. This optimizes the airflow channel, reduces airflow resistance, and ensures that the air flows quickly inside the rotor to remove the heat from the heat pipe 31.

[0022] Working principle: When the motor is running, the motor shaft 11 drives the rotor core 21 to rotate. The rotor winding groove 22 on the surface of the rotor core 21 is embedded with winding coils, forming the magnetic field of the motor. When the motor is running, the rotor core 21 will generate heat. The heat generated by the coil windings is first conducted through the metal substrate of the rotor core 21 to the heat pipe 31 located in the mounting hole 32. The heat pipe 31 transfers the heat to the heat pipe 31 located in the rotor ventilation groove 34. The elliptical rotor ventilation groove 34 guides the airflow to directionally scour the surface of the heat pipe 31. The heat pipe 31 releases heat in the rotor ventilation groove 34, helping to release the internal heat of the rotor core 21 and improve the heat dissipation efficiency.

[0023] The V-shaped cross-section of the heat dissipation hole 33 and the elliptical cross-section of the rotor ventilation slot 34 help to form an airflow channel and promote heat dissipation. The copper heat pipe 31 has high thermal conductivity, which facilitates the rapid conduction of heat, thereby effectively reducing the temperature of the rotor core 21 and improving the operating efficiency and reliability of the motor.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A permanent magnet motor rotor shaft with built-in micro heat pipe cooling, comprising a motor rotor shaft (11) and a rotor core (21) fixed to the outer wall of the motor rotor shaft (11), characterized in that: The motor shaft (11) passes through the interior of the rotor core (21) and cooperates with the mounting groove (24) on the surface of the rotor core (21). A heat dissipation component (3) is provided inside the rotor core (21). The heat dissipation assembly (3) includes a heat pipe (31) and a mounting hole (32) for accommodating the heat pipe (31). A portion of the heat pipe (31) is located inside the mounting hole (32). A heat dissipation hole (33) is provided inside the rotor core (21). A rotor ventilation groove (34) is provided inside the rotor core (21). Another portion of the heat pipe (31) is located inside the rotor ventilation groove (34).

2. The permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 1, characterized in that: The central axis of the motor shaft (11) coincides with the central axis of the rotor core (21).

3. The permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 1, characterized in that: A protrusion (12) is fixedly connected to the outer wall of the motor shaft (11), and an inner groove (23) that cooperates with the protrusion (12) is provided on the inner wall of the rotor core (21).

4. The permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 3, characterized in that: The cross-section of the protrusion (12) is set to a rectangle, and the outer wall of the protrusion (12) fits against the inner wall of the groove (23).

5. A permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 1, characterized in that: The surface of the rotor core (21) is provided with rotor winding grooves (22).

6. The permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 1, characterized in that: The heat pipe (31) is made of copper and is shaped like a square.

7. A permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 1, characterized in that: The heat dissipation hole (33) has a V-shaped cross section, and the rotor ventilation groove (34) has an elliptical cross section.

8. A permanent magnet motor rotor shaft with built-in micro heat pipe heat dissipation according to claim 1, characterized in that: The heat pipe (31) has no contact with the inner wall of the rotor ventilation slot (34).

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