Cooling structure of permanent magnet motor

Abstract

The utility model relates to permanent magnet motor cooling technical field, concretely relates to a cooling structure of permanent magnet motor, including permanent magnet motor body, the cooling pipeline is installed in permanent magnet motor body, and the cooling pipeline includes front cooling pipe and rear cooling pipe, and the two pipe mouths of front cooling pipe and rear cooling pipe are fixed with inlet pipe and outlet pipe respectively, and the straight -through pipe is fixed with on the inlet pipe of front cooling pipe and rear cooling pipe, and the connecting pipe is fixed with on the outlet pipe of front cooling pipe and rear cooling pipe, and the outside of permanent magnet motor body is installed with water tank, and the top of water tank is installed with water pump through bolt. The utility model uses the cooling pipe in permanent magnet motor and absorbs the heat in the motor in the cooling pipe through circulating medium, then takes out, realizes the cooling purpose of permanent magnet motor, and the heat capacity of cooling water or cooling liquid is bigger, and the efficiency of heat absorption and heat dissipation is compared with forced ventilation, and all have the substantial promotion.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor cooling technology, specifically to a cooling structure for a permanent magnet motor. Background Technology

[0002] A permanent magnet motor is a type of motor that uses permanent magnets to create a magnetic field to achieve energy conversion and transfer. A permanent magnet motor mainly consists of a stator, a rotor, and permanent magnets. The stator is typically made of laminated silicon steel sheets with windings to generate a rotating magnetic field; the rotor is equipped with permanent magnets, serving as the motor's permanent magnetic source. When alternating current is applied to the stator windings, a rotating magnetic field is generated. This magnetic field interacts with the rotor's permanent magnets, causing the rotor to rotate and thus converting electrical energy into mechanical energy.

[0003] The energy conversion rate of permanent magnet motors is not 100%, so some electrical energy is lost as heat. This heat needs to be dissipated in time to avoid heat accumulation and excessive internal temperature of the permanent magnet motor, which can lead to demagnetization of the permanent magnet and other issues affecting the stable operation of the motor. Currently, the cooling of permanent magnet motors mainly relies on the fan built into the tail section. This type of cooling dissipates heat from the motor casing through forced ventilation, but this indirect cooling method is inefficient. Utility Model Content

[0004] To achieve the above objectives, this utility model specifically adopts the following technical solution: A cooling structure for a permanent magnet motor includes a permanent magnet motor body, a central rotating shaft mounted in the middle of the permanent magnet motor body, a rotor mounted on the central rotating shaft inside the permanent magnet motor body, and a tail fan mounted on the central rotating shaft at the rear of the permanent magnet motor body. The permanent magnet motor body contains cooling pipes, including a front cooling pipe and a rear cooling pipe. The front cooling pipe is located in front of the rotor and installed inside the permanent magnet motor body, while the rear cooling pipe is located at the rear of the permanent magnet motor body. Inlet and outlet pipes are welded to the two ends of the front and rear cooling pipes, respectively. A straight pipe is welded to the inlet pipe of both the front and rear cooling pipes, and a connecting pipe is welded to the outlet pipe of both the front and rear cooling pipes. A water tank is mounted on the outside of the permanent magnet motor body, and a water pump is bolted to the top of the water tank. The connecting pipe of the front cooling pipe is connected to the output end of the water pump, and a suction pipe is connected to the input end of the water pump, extending into the water tank. The connecting pipe of the rear cooling pipe also extends into the water tank.

[0005] Furthermore, the aftercooler pipe is mounted on the permanent magnet motor body located behind the tail fan.

[0006] Furthermore, multiple heat sinks with equal spacing are welded and fixed to the outside of the straight pipe. The heat sinks are made of copper or aluminum.

[0007] Furthermore, both the front cooling pipe and the rear cooling pipe are arranged in a star-shaped structure radiating outward from the central axis.

[0008] Furthermore, multiple equally spaced fixing sleeves are welded and fixed inside the permanent magnet motor body on the front side of the rotor, and the front cooling pipe is located inside the fixing sleeve and supported.

[0009] Furthermore, a fixing ring is welded and fixed to the front cooling pipe, and multiple support rods at equal intervals are welded and fixed to the outside of the fixing ring. The outer ends of the support rods are welded and fixed to the permanent magnet motor body on the front side of the rotor.

[0010] Furthermore, at least two fixing rings are welded and fixed to the rear cooling pipe, and the fixing rings are welded and fixed to the permanent magnet motor body on the rear side of the tail fan.

[0011] Furthermore, the height of the inlet pipe of the front cooling pipe is higher than the height of the inlet pipe of the rear cooling pipe.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model uses cooling water or coolant as a circulating medium and sets up a cooling pipe inside the permanent magnet motor. The circulating medium absorbs heat from the motor inside the cooling pipe and then carries it out, thereby achieving the purpose of cooling the permanent magnet motor. The cooling water or coolant has a larger specific heat capacity, and the efficiency of heat absorption and dissipation is significantly improved compared with forced ventilation.

[0013] 2. In this utility model, a rear cooling pipe is installed on the rear side of the tail fan of the permanent magnet motor. The motor's own fan can dissipate heat from the circulating medium after heat absorption, so that the circulating medium can participate in the circulation at a lower temperature when it re-enters the circulation, thereby improving the circulation heat dissipation efficiency. It also makes full use of the motor's fixed components, thus improving the utilization rate.

[0014] 3. In this utility model, the star-shaped structure of the front cooling pipe and the rear cooling pipe greatly increases the flow path of the circulating medium within the limited space of the permanent magnet motor and the ventilation area of ​​the tail fan, thereby ensuring the heat absorption and heat dissipation during circulation.

[0015] 4. The present invention uses a fixing ring to fix the front cooling pipe and the rear cooling pipe. It can not only be used for fixing, but also act as a heat sink, increasing the contact area with the environment, thereby improving the heat exchange efficiency.

[0016] 5. In this utility model, heat sinks are installed on the straight pipe connecting the front cooling pipe and the rear cooling pipe, which can dissipate heat before the circulating medium enters the rear cooling pipe and then concentrate heat dissipation in the rear cooling pipe, thereby improving the heat dissipation effect after the circulating medium absorbs heat. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention; Figure 2 This is a rear view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a perspective view of the cooling pipes in this utility model; Figure 5 This is a perspective view of the front cooling pipe in this utility model; Figure 6 This is a perspective view of the aftercooler pipe in this utility model.

[0018] Reference numerals in the attached diagram: 1. Permanent magnet motor body; 11. Central shaft; 12. Rotor; 13. Tail fan; 2. Cooling pipes; 21. Front cooling pipe; 22. Rear cooling pipe; 23. Inlet pipe; 24. Outlet pipe; 25. Straight pipe; 26. Connecting pipe; 27. Heat sink; 28. Pumping pipe; 29. ​​Fixing ring one; 210. Support rod; 211. Fixing sleeve; 212. Fixing ring two; 3. Water tank; 4. Water pump. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] This application provides a cooling structure for a permanent magnet motor and offers the following technical solution, which will be discussed in conjunction with... Figures 1-6 Please provide a detailed explanation: A cooling structure for a permanent magnet motor, such as Figure 1-6 As shown, the device includes a permanent magnet motor body 1, a central rotating shaft 11 installed in the middle of the permanent magnet motor body 1, a rotor 12 installed on the central rotating shaft 11 inside the permanent magnet motor body 1, an exhaust fan 13 installed on the central rotating shaft 11 at the rear of the permanent magnet motor body 1, and a cooling pipe 2 installed inside the permanent magnet motor body 1. The cooling pipe 2 includes a front cooling pipe 21 and a rear cooling pipe 22. The front cooling pipe 21 is installed inside the permanent magnet motor body 1 in front of the rotor 12, and the rear cooling pipe 22 is installed at the rear of the permanent magnet motor body 1. Water inlet pipe 23 and water outlet pipe 24 are welded and fixed to the two ends of the front cooling pipe 21 and the rear cooling pipe 22, respectively. Straight pipe 25 is welded and fixed to the water inlet pipe 23 of the front cooling pipe 21 and the rear cooling pipe 22. Connecting pipe 26 is welded and fixed to the water outlet pipe 24 of the front cooling pipe 21 and the rear cooling pipe 22. A water tank 3 is installed on the outside of the permanent magnet motor body 1. A water pump 4 is installed on the top of the water tank 3 by bolts. The connecting pipe 26 of the front cooling pipe 21 is connected to the output end of the water pump 4. A water pumping pipe 28 is connected to the input end of the water pump 4. The water pumping pipe 28 extends into the water tank 3. The connecting pipe 26 of the rear cooling pipe 22 extends into the water tank 3.

[0021] When the forward water tank 3 is filled with coolant or cooling water, and the permanent magnet motor body 1 is working, the water pump 4 is simultaneously turned on. When the water pump 4 is working, the input end draws coolant or cooling water from the water tank 3 through the water pipe 28, and then sends it from the output end into the connecting pipe 26 of the front cooling pipe 21, then from the connecting pipe 26 into the front cooling pipe 21, then into the straight pipe 25, then into the rear cooling pipe 22, and finally back into the water tank 3 from the connecting pipe 26 of the rear cooling pipe 22, thus achieving circulation. The front cooling pipe 21 is located on the rotor. Inside the permanent magnet motor body 1 on the front side of 12, when the coolant or cooling water enters the front cooling pipe 21, it absorbs the heat dissipated by the permanent magnet motor body 1 during operation, and then carries the heat out of the permanent magnet motor body 1. When the heat is in the straight pipe 25, the rear cooling pipe 22 and the connecting pipe 26 of the rear cooling pipe 22, the heat is dissipated outward. Since the straight pipe 25, the rear cooling pipe 22 and the connecting pipe 26 of the rear cooling pipe 22 are all located on the outside, the heat is dissipated into the environment, so that the temperature of the coolant or cooling water is reduced before it is circulated.

[0022] like Figure 2 and Figure 3 As shown, the rear cooling pipe 22 is installed on the permanent magnet motor body 1 behind the tail fan 13.

[0023] When the permanent magnet motor body 1 is working, the central shaft 11 rotates, while the tail fan 13 is fixed to the central shaft 11. The tail fan 13 is driven to rotate. By rotating the tail fan 13, the permanent magnet motor body 1 is cooled from the tail end through forced ventilation. When the tail fan 13 provides forced ventilation, the cooling airflow blows directly onto the rear cooling pipe 22. The airflow carries away the heat of the coolant or cooling water passing through the rear cooling pipe 22, thereby further reducing the temperature of the coolant or cooling water. When the coolant or cooling water with a lower temperature re-enters the circulation, it absorbs more heat, thereby improving the circulation cooling effect.

[0024] like Figure 2 and Figure 4 As shown, multiple heat sinks 27 with equal spacing are welded and fixed to the outside of the straight pipe 25. The heat sinks 27 are made of copper or aluminum.

[0025] The coolant or cooling water that absorbs heat in the front cooling pipe 21 enters the straight pipe 25 when it leaves the permanent magnet motor body 1. After the heat sink 27 is installed on the straight pipe 25, the contact area between the straight pipe 25 and the external environment is increased, thereby improving the heat exchange efficiency and increasing the natural heat dissipation speed of the coolant or cooling water at the position of the straight pipe 25. Combined with the ventilation of the tail fan 13, the heat dissipation efficiency of the coolant or cooling water after absorbing heat is comprehensively improved.

[0026] like Figure 4 As shown, both the front cooling pipe 21 and the rear cooling pipe 22 are arranged in a star-shaped structure radiating outward from the central rotating shaft 11.

[0027] The central rotating shaft 11 passes through the middle of the front cooling pipe 21 and the rear cooling pipe 22 without contacting them. The star-shaped structure increases the length of the front cooling pipe 21 within the permanent magnet motor body 1. The longer length means that the coolant or cooling water has more time to absorb heat within the permanent magnet motor body 1, thus ensuring that sufficient heat is absorbed each time cooling occurs.

[0028] like Figure 3 and Figure 5 As shown, multiple fixed sleeves 211 with equal spacing are welded and fixed inside the permanent magnet motor body 1 on the front side of the rotor 12, and the front cooling pipe 21 is located inside the fixed sleeve 211 and is supported.

[0029] The fixing sleeve 211 provides a fixation for the front cooling pipe 21, keeping it installed inside the permanent magnet motor body 1, and preventing the front cooling pipe 21 from touching the rotating rotor 12 or the central shaft 11, which could lead to collision damage.

[0030] like Figure 5 As shown, a fixing ring 29 is also welded and fixed on the front cooling pipe 21. Multiple support rods 210 with equal spacing are welded and fixed on the outside of the fixing ring 29. The outer ends of the support rods 210 are welded and fixed to the permanent magnet motor body 1 on the front side of the rotor 12.

[0031] When the permanent magnet motor body 1 is working, the central shaft 11 rotates at high speed. The higher the rotation speed, the greater the vibration during operation. If the front cooling pipe 21 is only connected by the fixing sleeve 211, it may swing inside the permanent magnet motor body 1 due to vibration. After setting the fixing ring 29, it is first fixed to the front cooling pipe 21, and then the support rod 210 is used to fix the fixing ring 29 to the permanent magnet motor body 1. Multiple support rods 210 provide multiple points of fixation. Combined with the connection of the fixing sleeve 211, the installation stability of the front cooling pipe 21 inside the permanent magnet motor body 1 is comprehensively increased.

[0032] like Figure 6As shown, at least two fixing rings 212 are welded and fixed on the rear cooling pipe 22. The fixing rings 212 are welded and fixed to the permanent magnet motor body 1 on the rear side of the tail fan 13.

[0033] The second fixing ring 212 provides a fixation for the rear cooling pipe 22 and connects the rear cooling pipe 22 to the permanent magnet motor body 1, giving it a stable fixing base. At the same time, the second fixing ring 212 can also be used for heat dissipation, increasing the contact area between the rear cooling pipe 22 and the airflow blown out by the tail fan 13, thereby improving the heat exchange efficiency.

[0034] like Figure 3 As shown, the height of the inlet pipe 23 of the front cooling pipe 21 is higher than the height of the inlet pipe 23 of the rear cooling pipe 22.

[0035] Since the coolant or cooling water enters the front cooling pipe 21 first and then enters the rear cooling pipe 22 through the straight pipe 25 during circulation, raising the height of the inlet pipe 23 of the front cooling pipe 21 means that the straight pipe 25 is tilted. In this way, when the coolant or cooling water flows from the straight pipe 25 to the rear cooling pipe 22, it is not only affected by the output pressure of the water pump 4, but also by the superposition of gravity, which makes the coolant or cooling water flow into the rear cooling pipe 22 more quickly in the straight pipe 25.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling structure for a permanent magnet motor, comprising a permanent magnet motor body (1), a central rotating shaft (11) mounted in the middle of the permanent magnet motor body (1), a rotor (12) mounted on the central rotating shaft (11) inside the permanent magnet motor body (1), and an organic tail fan (13) mounted on the central rotating shaft (11) at the rear of the permanent magnet motor body (1), characterized in that, The permanent magnet motor body (1) is equipped with a cooling pipe (2), which includes a front cooling pipe (21) and a rear cooling pipe (22). The front cooling pipe (21) is installed in the permanent magnet motor body (1) located in front of the rotor (12), and the rear cooling pipe (22) is installed in the rear of the permanent magnet motor body (1). The two ends of the front cooling pipe (21) and the rear cooling pipe (22) are respectively welded and fixed with water inlet pipe (23) and water outlet pipe (24). A straight pipe (25) is welded and fixed on the water inlet pipe (23) of the front cooling pipe (21) and the rear cooling pipe (22). A connecting pipe (26) is welded and fixed on the water outlet pipe (24) of the front cooling pipe (21) and the rear cooling pipe (22). A water tank (3) is installed on the outside of the permanent magnet motor body (1). A water pump (4) is installed on the top of the water tank (3) by bolts. The connecting pipe (26) of the front cooling pipe (21) is connected to the output end of the water pump (4). A pumping pipe (28) is connected to the input end of the water pump (4). The pumping pipe (28) extends into the water tank (3). The connecting pipe (26) of the rear cooling pipe (22) extends into the water tank (3).

2. The cooling structure for a permanent magnet motor according to claim 1, characterized in that, The rear cooling pipe (22) is installed on the permanent magnet motor body (1) behind the tail fan (13).

3. The cooling structure for a permanent magnet motor according to claim 2, characterized in that, The outside of the straight tube (25) is welded with multiple heat sinks (27) at equal intervals, which are made of copper or aluminum.

4. A cooling structure for a permanent magnet motor according to any one of claims 1-3, characterized in that, Both the front cooling pipe (21) and the rear cooling pipe (22) are arranged in a star-shaped structure radiating outward from the central rotating shaft (11).

5. The cooling structure for a permanent magnet motor according to claim 4, characterized in that, Multiple fixed sleeves (211) with equal spacing are welded and fixed inside the permanent magnet motor body (1) on the front side of the rotor (12), and the front cooling pipe (21) is located inside the fixed sleeve (211) and supported.

6. The cooling structure for a permanent magnet motor according to claim 5, characterized in that, A fixing ring (29) is also welded and fixed on the front cooling pipe (21). Multiple support rods (210) with equal spacing are welded and fixed on the outside of the fixing ring (29). The outer end of the support rod (210) is welded and fixed to the permanent magnet motor body (1) on the front side of the rotor (12).

7. The cooling structure for a permanent magnet motor according to claim 4, characterized in that, At least two fixing rings (212) are welded and fixed on the rear cooling pipe (22), and the fixing rings (212) are welded and fixed to the permanent magnet motor body (1) on the rear side of the tail fan (13).

8. The cooling structure for a permanent magnet motor according to claim 1, characterized in that, The height of the inlet pipe (23) of the front cooling pipe (21) is higher than the height of the inlet pipe (23) of the rear cooling pipe (22).

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