Motor cooling structure and permanent magnet motor comprising same

Abstract

The utility model provides a kind of motor cooling structure and the permanent magnet motor comprising it.The motor cooling structure includes: first radiating passage, the first radiating passage extends along the axial direction of rotor, the first radiating passage is communicated with stator and the air gap of the rotor, the both ends of the first radiating passage are provided with multiple air inlets, multiple the air inlets are distributed on the first radiating passage along the circumferential direction;Second radiating passage, the second radiating passage is communicated with the first radiating passage, the second radiating passage is annularly arranged on the outer circumferential side of the rotor along the radial direction of rotor and is communicated with the air gap of the stator and the rotor, and the second radiating passage includes air outlet;Radiating portion, the radiating portion is arranged at the air outlet.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a motor cooling structure and a permanent magnet motor including the same. Background Technology

[0002] Currently, permanent magnet motors are cooled using various methods, including air-to-water cooling, air-to-air cooling, and stator water jacket + rotor air-to-water cooling. The motor windings are mostly copper wire windings. While existing technologies can cool permanent magnet motors—for example, by using fans to circulate air inside the motor or by using cooling housings to allow outside air to come into contact with the housing and indirectly remove heat—the heat dissipation effect is limited due to constraints in heat exchange efficiency and air inlet space. This limits the improvement of the motor's power density and torque density. Utility Model Content

[0003] The technical problem to be solved by this utility model is the poor cooling effect of permanent magnet motors in the prior art, and provides a motor cooling structure and a permanent magnet motor including the structure.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A motor cooling structure, the motor cooling structure comprising:

[0006] The first heat dissipation channel extends along the axial direction of the rotor and is connected to the air gap between the stator and the rotor. Multiple air inlets are provided at both ends of the first heat dissipation channel, and the multiple air inlets are evenly distributed on the first heat dissipation channel along the circumferential direction.

[0007] The second heat dissipation channel is connected to the first heat dissipation channel. The second heat dissipation channel is arranged around the outer periphery of the rotor along the radial direction of the rotor and is connected to the air gap between the stator and the rotor. The second heat dissipation channel includes an air outlet.

[0008] A heat dissipation unit is provided at the air outlet.

[0009] In this design, by setting up a first and second heat dissipation channel connected to the air gap between the rotor and stator, cool air with a lower external temperature can directly enter the motor through these channels and exchange heat with the heat-generating components, carrying away the heat from these components. This direct air cooling method effectively cools the motor. This improves the motor's cooling efficiency and performance, resulting in a lower temperature rise for the same power output compared to indirect heat exchange air or water cooling systems. Eliminating complex components such as coolers simplifies the motor structure, reduces the number of cooling parts, lowers operating costs, and facilitates maintenance. Furthermore, a heat dissipation section is installed at the air outlet to further enhance the flow efficiency of the cool air.

[0010] Preferably, the motor cooling structure further includes a flow guide, which is disposed between the first heat dissipation channel and the second heat dissipation channel along the axial direction of the rotor, and the first heat dissipation channel is connected to the second heat dissipation channel through the flow guide.

[0011] In this solution, the above-mentioned settings are used to guide the airflow from the first heat dissipation channel into the second heat dissipation channel, thereby improving cooling efficiency.

[0012] Preferably, the first heat dissipation channel has an opening, one end of the flow guide is connected to the opening, and the other end of the flow guide is connected to the end of the second heat dissipation channel along the axial direction of the rotor.

[0013] In this solution, the opening is sealed by the above-mentioned arrangement, allowing airflow to smoothly enter the second heat dissipation channel. This avoids gaps at the connection between the first heat dissipation channel and the guide section, which would cause airflow to flow out through the gaps and affect the flow rate of the airflow entering the second heat dissipation channel.

[0014] Preferably, the guide portion includes an oil-blocking and sand-proof plate.

[0015] In this solution, the above-mentioned settings are used to prevent the accumulation of oil and gravel in the airflow guide, thereby maintaining the airflow guiding effect.

[0016] Preferably, the heat dissipation unit includes a heat dissipation fan.

[0017] In this solution, the above-mentioned setup utilizes a cooling fan to create negative pressure at the air outlet, drawing in cooler air into the first cooling channel and allowing it to flow out from both the first and second cooling channels, thereby improving airflow efficiency and consequently enhancing cooling efficiency.

[0018] Preferably, the motor cooling structure further includes a filter section, which is disposed at the air inlet and is used to filter impurities.

[0019] In this solution, the above settings are used to filter the airflow entering the first heat dissipation channel, preventing impurities from entering the first heat dissipation channel and flowing into the air gap between the rotor and the stator.

[0020] Preferably, the second heat dissipation channel is disposed on the outer periphery of the stator.

[0021] In this design, the second heat dissipation channel wraps around the sides and ends of the stator, so that the airflow entering the second heat dissipation channel can fully contact the stator and carry away the heat from the stator surface.

[0022] Preferably, aluminum windings are wound on the stator and the rotor.

[0023] In this solution, the above configuration, compared to winding copper windings on the stator and rotor, results in better motor cooling through direct air cooling. While achieving better cooling, the use of aluminum windings can reduce motor weight and cost without compromising motor performance, making the motor more economical.

[0024] Preferably, along the height direction of the motor, the air outlet is located outside the air inlet.

[0025] In this solution, the above-mentioned arrangement is used to avoid the air inlet being too close to the air outlet, which would affect the airflow velocity towards the air outlet. At the same time, the air outlet is located outside the air inlet, so that the air that has carried away the heat from the motor's heating components is not drawn back into the air inlet.

[0026] A permanent magnet motor, the permanent magnet motor including the motor cooling structure described above.

[0027] In this solution, the permanent magnet motor includes the aforementioned motor cooling structure to improve cooling efficiency through direct cooling. At the same time, compared to copper windings on the stator and rotor, using aluminum windings on the stator and rotor can reduce motor weight and cost without compromising motor performance, and the motor power density and torque density can be increased accordingly.

[0028] The significant advantages of this invention are as follows: By establishing a first and a second heat dissipation channel that connects to the air gap between the rotor and stator, as well as the gap between the magnetic pole modules on the rotor, cool air from outside the motor can directly enter the motor and exchange heat with the heat-generating components, thus removing heat from these components. This direct air cooling method effectively cools the motor. This invention improves the motor's cooling efficiency and performance, resulting in a lower temperature rise for the same power output compared to indirect heat exchange air or water cooling systems. Furthermore, this invention eliminates the need for complex components such as coolers, simplifying the motor structure, reducing cooling components, lowering operating costs, and facilitating maintenance. Additionally, the addition of a heat dissipation section at the air outlet further enhances the efficiency of cool air flow. Attached Figure Description

[0029] Figure 1 This is a left view of the motor cooling structure of a preferred embodiment of the present invention.

[0030] Figure 2 This is a rear view of the motor cooling structure according to a preferred embodiment of the present invention.

[0031] Figure 3 This is a front view of the motor cooling structure according to a preferred embodiment of the present invention.

[0032] Figure 4 This is a right view of the motor cooling structure of a preferred embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the motor cooling structure according to a preferred embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] First heat dissipation channel 1

[0036] Air intake 11

[0037] Opening 12

[0038] Rotor 2

[0039] Stator 3

[0040] Second heat dissipation channel 4

[0041] Air outlet 41

[0042] Heat dissipation section 5

[0043] 6 flow guide

[0044] Filter section 7 Detailed Implementation

[0045] The following are some preferred embodiments, which will be described more clearly and completely with reference to the accompanying drawings.

[0046] This embodiment provides a motor cooling structure, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the motor cooling structure includes:

[0047] The first heat dissipation channel 1 extends along the axial direction of the rotor 2 and is connected to the air gap between the stator 3 and the rotor 2. Multiple air inlets 11 are provided at both ends of the first heat dissipation channel 1. The multiple air inlets 11 are connected to the outside of the motor and are evenly distributed on the first heat dissipation channel 1 in the circumferential direction for allowing external cold air to enter the motor.

[0048] The second heat dissipation channel 4 is connected to the first heat dissipation channel 1. The second heat dissipation channel 4 is arranged around the outer periphery of the rotor 2 along the radial direction of the rotor 2 and is connected to the air gap between the stator 3 and the rotor 2. The second heat dissipation channel 4 includes an air outlet 41.

[0049] Heat dissipation unit 5 is located at air outlet 41.

[0050] Specifically, the first heat dissipation channel 1 is a cavity formed by the solid wall of the motor housing. The first heat dissipation channel 1 covers the rotor 2 and extends along the axial direction of the rotor 2. The first heat dissipation channel 1 passes through the rotor 2, then through the magnetic pole modules of the rotor 2, and connects to the air gap of the magnetic pole modules. The ends of the first heat dissipation channel 1 are closed, and multiple air inlets 11 are distributed along the axial direction of the rotor 2 at both ends of the first heat dissipation channel 1, and also distributed circumferentially along the rotor 2. Simultaneously, the first heat dissipation channel 1 encloses the stator 3, thereby achieving communication between the first heat dissipation channel 1 and the air gap between the rotor 2 and the stator 3, as well as the gap between the first heat dissipation channel 1 and the magnetic pole modules on the rotor 2. This allows cooler ambient air to directly enter the first heat dissipation channel 1 through the air inlets 11 and carry away the heat from the air gap between the rotor 2 and the stator 3, and the gap between the magnetic pole modules on the rotor 2, thus achieving heat dissipation for the rotor 2. Compared to indirect heat exchange methods such as air cooling or water cooling, this embodiment improves motor cooling efficiency and achieves effective motor cooling by directly introducing ambient air for heat dissipation, i.e., direct air cooling.

[0051] In this embodiment, a second heat dissipation channel 4 is also provided, which is also a cavity formed by the solid wall of the motor housing. In this embodiment, the rotor 2 is located outside the stator 3, and the second heat dissipation channel 4 covers the outer periphery of the rotor 2 away from the stator 3. The second heat dissipation channel 4 extends along the axial direction of the rotor 2 and has a certain width in the radial direction of the rotor 2. The second heat dissipation channel 4 simultaneously encloses the rotor 2 and the stator 3, and connects the gap between the magnetic pole modules on the air gap rotor of the rotor 2 and the stator 3, and connects to the first heat dissipation channel 1. An air outlet 41 is provided on the second heat dissipation channel 4, and a heat dissipation part 5 is provided inside the air outlet 41. The heat dissipation part 5 can be a structure that drives air flow in the prior art, such as a fan, or a structure that increases the air flow rate, such as a venturi tube structure. By setting up a first heat dissipation channel 1 and a second heat dissipation channel 4 that connect with the air gap between the rotor 2 and the stator 3, as well as the gap between the magnetic pole modules on the rotor, cool air with a lower external temperature can directly enter the motor through the first heat dissipation channel 1 and the second heat dissipation channel 4 and exchange heat with the various heat-generating components, carrying away the heat from the motor's heat-generating components. This achieves the purpose of cooling the motor by using direct air cooling. This improves the motor's cooling efficiency and performance, resulting in a lower temperature rise for the same power compared to indirect heat exchange air cooling or water cooling devices that are attached to the motor housing. Eliminating complex components such as coolers simplifies the motor structure, reduces the number of cooling components, lowers operating costs, and facilitates maintenance. In addition, by setting a heat dissipation part 5 at the air outlet 41, the flow efficiency of cool air is further improved.

[0052] In some other embodiments, the rotor 2 is located inside the stator 3. In this case, the second heat dissipation channel 4 is distributed on the side of the stator 3 away from the rotor 2, which will not be described in detail here.

[0053] like Figure 5 As shown, in this embodiment, the motor cooling structure further includes a flow guide 6, which is disposed between the first heat dissipation channel 1 and the second heat dissipation channel 4 along the axial direction of the rotor 2. The first heat dissipation channel 1 is connected to the second heat dissipation channel 4 through the flow guide 6.

[0054] Specifically, a guide section 6 is provided at the connection between the first heat dissipation channel 1 and the second heat dissipation channel 4. The guide section 6 extends along the axial direction of the rotor 2 to receive the airflow from the first heat dissipation channel 1. The guide section 6 is used to guide the airflow flowing from the first heat dissipation channel 1 into the second heat dissipation channel 4, so as to avoid the airflow velocity from decreasing when entering the second heat dissipation channel 4, thereby improving the cooling efficiency.

[0055] Furthermore, in this embodiment, the first heat dissipation channel 1 has an opening 12, one end of the flow guide 6 is connected to the opening 12, and the other end of the flow guide 6 is connected to the end of the second heat dissipation channel 4 along the axial direction of the rotor 2.

[0056] Specifically, the first heat dissipation channel 1 has openings 12 at both ends along the axial direction of the rotor 2. The openings 12 penetrate the wall of the motor and have solid surfaces to enclose and form a first open cavity. An air inlet 11 is provided on the opening 12. A guide section 6 is connected to the surface of the opening 12 facing the rotor 2, and the other end of the guide section 6 extends towards the rotor 2. The guide section 6 is provided at the opening of the first open cavity of the opening 12 to narrow the opening and form a second open cavity, preventing air from escaping and thus guiding the airflow. Similarly, the second heat dissipation channel 4 is formed by the wall of the opening 12 and the guide section 6 to create a cavity for air circulation, thereby allowing airflow to smoothly enter the second heat dissipation channel 4. This avoids gaps at the connection between the first heat dissipation channel 1 and the guide section 6, which would cause airflow to flow out and affect the flow rate of air entering the second heat dissipation channel 4.

[0057] In this embodiment, the flow guide 6 includes an oil-blocking and sand-proof plate. The oil-blocking and sand-proof plate is a conventional air-guiding, oil-mist-blocking, and sand-proof plate. In other embodiments, the flow guide 6 may also be a solid plate made of the same material as the motor housing, to effectively connect with the wall surface of the opening 12 and the corresponding opening 12 of the second heat dissipation channel 4. Along the radial direction of the rotor 2, the flow guide 6 is located at the bottom of the first heat dissipation channel 1. On the one hand, the flow guide 6 is used to guide the airflow from the first heat dissipation channel 1 into the second heat dissipation channel 4; on the other hand, by setting the flow guide 6 as an oil-blocking and sand-proof plate, the flow guide 6 can avoid the accumulation of oil and sand, thereby maintaining the airflow guiding effect.

[0058] In this embodiment, the heat dissipation unit 5 includes a heat dissipation fan. The heat dissipation fan is disposed at the air outlet 41 to create a negative pressure at the air outlet 41, drawing in cooler air into the first heat dissipation channel 1 and out through the first heat dissipation channel 1 and the second heat dissipation channel 4, thereby improving the airflow efficiency and correspondingly improving the cooling efficiency.

[0059] In this embodiment, the motor cooling structure further includes a filter section 7, which is disposed at the air inlet 11 and is used to filter impurities. The filter section 7 can be a filter screen as in the prior art. The filter screen covers the air inlet 11 to filter the airflow entering the first heat dissipation channel 1, preventing impurities from entering the first heat dissipation channel 1 and flowing into the air gap between the rotor 2 and the stator 3, thus keeping the internal structure of the motor clean.

[0060] In this embodiment, the second heat dissipation channel 4 is covered on the outer periphery of the stator 3.

[0061] Specifically, the second heat dissipation channel 4 is covered on the outer periphery of the stator 3. That is, the second heat dissipation channel 4 is located outside the air gap between the rotor 2 and the stator 3. When the outside air with a lower temperature flows into the first heat dissipation channel 1 along the axial direction of the rotor 2, enters the air gap between the rotor 2 and the stator 3, and flows from the outside of the stator 3, the airflow direction changes due to the spaced arrangement of the stator 3 iron core, and flows along the height direction of the motor, so that the airflow entering the second heat dissipation channel 4 can fully contact the stator 3 and carry away the heat on the surface of the stator 3.

[0062] In this embodiment, aluminum windings are wound on the stator 3 and rotor 2. Compared to copper windings on the stator 3 and rotor 2, the direct air cooling method results in better motor cooling. Using aluminum windings reduces motor weight and cost without compromising motor performance, making the motor more economical.

[0063] In this embodiment, along the height direction of the motor, the air outlet 41 is located outside the air inlet 11. That is, the air inlet 11 is closer to the rotor, stator, and their air gap, while the air outlet 41 is farther away from the rotor 2, stator 3, and their air gap. This allows the lower-temperature air introduced by the air inlet 11 to better enter the rotor 2, stator 3, and air gap to optimize the cooling effect, and allows the air that has carried away the heat from the motor's heat-generating components to be discharged through the air outlet 41, preventing it from being re-intaken by the air inlet 11. Furthermore, since the air inlet 11 and the air outlet 41 are set separately, the air inlet 11 is prevented from being too close to the air outlet 41, thus avoiding affecting the airflow velocity towards the air outlet.

[0064] This embodiment also provides a permanent magnet motor, which includes the above-mentioned motor cooling structure to improve cooling efficiency by using direct cooling. At the same time, compared with copper windings on stator 3 and rotor 2, aluminum windings can be used on stator 3 and rotor 2 to reduce motor weight and cost based on direct cooling.

[0065] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A motor cooling structure, characterized in that, The motor cooling structure includes: The first heat dissipation channel extends along the axial direction of the rotor and is connected to the air gap between the stator and the rotor. Multiple air inlets are provided at both ends of the first heat dissipation channel, and the multiple air inlets are evenly distributed on the first heat dissipation channel along the circumferential direction. The second heat dissipation channel is connected to the first heat dissipation channel. The second heat dissipation channel is arranged around the outer periphery of the rotor along the radial direction of the rotor and is connected to the air gap between the stator and the rotor. The second heat dissipation channel includes an air outlet. A heat dissipation unit is provided at the air outlet.

2. The motor cooling structure as described in claim 1, characterized in that, The motor cooling structure further includes a flow guide, which is disposed between the first heat dissipation channel and the second heat dissipation channel along the axial direction of the rotor. The first heat dissipation channel is connected to the second heat dissipation channel through the flow guide.

3. The motor cooling structure as described in claim 2, characterized in that, The first heat dissipation channel has an opening, one end of the flow guide is connected to the opening, and the other end of the flow guide is connected to the end of the second heat dissipation channel along the axial direction of the rotor.

4. The motor cooling structure as described in claim 2, characterized in that, The flow guide includes an oil-blocking and sand-proof plate.

5. The motor cooling structure as described in claim 1, characterized in that, The heat dissipation unit includes a heat dissipation fan.

6. The motor cooling structure as described in claim 1, characterized in that, The motor cooling structure also includes a filter section, which is located at the air inlet and is used to filter impurities.

7. The motor cooling structure as described in claim 1, characterized in that, The second heat dissipation channel is covered on the outer periphery of the stator.

8. The motor cooling structure as described in claim 1, characterized in that, The stator and the rotor are wound with aluminum windings.

9. The motor cooling structure as described in claim 1, characterized in that, Along the height direction of the motor, the air outlet is located outside the air inlet.

10. A permanent magnet motor, characterized in that, The permanent magnet motor includes a motor cooling structure as described in any one of claims 1-9.

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