permanent magnet motor

Abstract

The application discloses a permanent magnet motor, which comprises a stator and a rotor, the rotor is arranged at the inner circumferential side of the stator, the rotor comprises a rotor house and a plurality of magnetic pole modules, the plurality of magnetic pole modules are arranged at the outer circumferential side of the rotor house along the circumferential direction of the rotor house, and the gap between adjacent magnetic pole modules extends outwardly and obliquely from the outer wall of the rotor house in the direction away from the rotation direction of the rotor house. In the application, the air in the driving gap flows outward during the rotation of the permanent magnet motor, the air in the air gap between the driving stator and the rotor flows, the permanent magnet motor is cooled, the air flow resistance and the wind friction loss are reduced, the heat dissipation of the permanent magnet motor is enhanced, in addition, the resistance during the rotation of the rotor is reduced, the mechanical loss of the rotor is reduced, and the efficiency of the permanent magnet motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of permanent magnet machines. BACKGROUND

[0002] Permanent magnet machine is mainly composed of stator and rotor, and the air gap is formed between the stator and the rotor to prevent the rotor from colliding and rubbing with the stator during rotation, and to provide a passage for cooling air to cool the generator. However, the air in the air gap is stirred during the rotation of the rotor, which makes the flow field extremely turbulent, resulting in a large flow resistance and wind friction loss, which seriously affects the heat dissipation of the motor. At the same time, it also brings a large resistance to the rotation of the rotor, resulting in an increase in the mechanical loss of the rotor, which reduces the efficiency of the motor. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects in the prior art that the flow resistance is large during the rotation of the rotor, which affects the heat dissipation of the motor and increases the mechanical loss of the rotor, and to provide a permanent magnet motor.

[0004] The present application solves the above technical problems by the following technical solutions:

[0005] The present application provides a kind of permanent magnet machines, the permanent magnet machine includes:

[0006] Stator;

[0007] Rotor, spaced apart from the inner circumferential side of the stator, the rotor includes rotor house and a plurality of magnetic pole modules, a plurality of the magnetic pole modules are spaced apart along the circumferential direction of the rotor house and are arranged on the outer circumferential side of the rotor house, and the gap between adjacent magnetic pole modules extends outwardly from the outer wall of the rotor house and inclines away from the rotation direction of the rotor house.

[0008] In this scheme, the above structure is used, and during the rotation of the rotor, the air in the driving gap flows outward, the air flow in the air gap between the stator and the rotor is driven, the permanent magnet motor is cooled, the air flow resistance and wind friction loss are reduced, and the heat dissipation of the permanent magnet motor is enhanced. In addition, during the rotation of the rotor, the resistance during the rotation of the rotor is reduced, the mechanical loss of the rotor is reduced, and the efficiency of the permanent magnet motor is improved.

[0009] Preferably, in the circumferential direction of the rotor house, a single magnetic pole module has a first end face and a second end face arranged opposite to each other, wherein the rotation direction of the rotor house is recorded from the first end face to the second end face, and the angle between the second end face and the rotor rotation linear velocity direction is greater than 90 degrees.

[0010] In the scheme, the second end face is inclined to one side, the rotor further reduces the flow resistance in the rotation process, drives the air flow to cool the permanent magnet motor, enhances the heat dissipation of the permanent magnet motor, further reduces the mechanical loss of the rotor, and further improves the efficiency of the permanent magnet motor.

[0011] Preferably, the first end face and the second end face are arranged in parallel.

[0012] Preferably, a through hole is arranged in the area of the rotor house opposite to the gap, and the through hole extends outwardly and obliquely from the inner wall of the rotor house in the direction away from the rotation direction of the rotor house.

[0013] In the scheme, the rotor drives the cooling air to enter the gap between the stator and the rotor from the inside of the rotor house along the through hole in the rotation process, increases the cooling area of the rotor, improves the air flow path of the rotor, reduces the flow resistance, and enhances the heat dissipation of the rotor, thereby further enhancing the heat dissipation of the permanent magnet motor.

[0014] Preferably, the angle between the axis direction of the through hole and the direction of the linear velocity of the rotor rotation is not less than the angle between the length direction of the gap and the direction of the linear velocity of the rotor rotation.

[0015] In the scheme, the flow resistance of the air in the rotation process of the rotor is further reduced, the mechanical loss of the rotor is reduced, and the heat dissipation of the rotor is further enhanced.

[0016] Preferably, the number of the through holes is multiple.

[0017] In the scheme, the rotor drives the cooling air to enter the gap between the stator and the rotor from the inside of the rotor house along the multiple through holes in the rotation process, further increases the cooling area of the rotor, further reduces the flow resistance, and further enhances the heat dissipation of the rotor.

[0018] Preferably, the number of the through holes is multiple along the axial direction of the rotor house.

[0019] And / or, the number of the through holes is multiple along the circumferential direction of the rotor house.

[0020] In the scheme, the cooling area of the rotor is increased in the axial direction of the rotor, the heat dissipation of the rotor is enhanced, the air flow resistance is further reduced, and the through hole is arranged along the axial direction of the rotor, which is convenient for processing. In the circumferential direction of the rotor, the cooling area of the rotor is increased, the heat dissipation of the rotor is enhanced, and the air flow resistance is further reduced.

[0021] Preferably, along the axial direction of the rotor house, the number of the magnetic pole modules is multiple, and the multiple magnetic pole modules are arranged in a staggered manner along the circumferential direction of the rotor house.

[0022] In the present scheme, the above structure is adopted to reduce motor torque fluctuation and enhance motor operation stability.

[0023] Preferably, along the axial direction of the rotor house, the multiple magnetic pole modules are arranged in a staggered manner.

[0024] In the present scheme, the above structure is adopted to reduce or avoid affecting electromagnetic performance and enhance permanent magnet motor operation stability.

[0025] Preferably, the magnetic pole module comprises a permanent magnet and a permanent magnet support, the permanent magnet is arranged inside the permanent magnet support, and the permanent magnet support is formed by laminated lamination.

[0026] The positive progress effect of the present application is that:

[0027] In the present application, during the rotation of the permanent magnet motor rotor, the air in the driving gap flows outward, the air in the air gap between the driving stator and the rotor flows, the permanent magnet motor is cooled, the air flow resistance and wind friction loss are reduced, and the heat dissipation of the permanent magnet motor is enhanced. In addition, during the rotation of the rotor, the resistance during the rotation of the rotor is reduced, the mechanical loss of the rotor is reduced, and the efficiency of the permanent magnet motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure of the permanent magnet motor of the preferred embodiment of the present application is shown in the figure.

[0029] Figure 2 The structure of the rotor of the preferred embodiment of the present application is shown in the figure.

[0030] Explanation of reference signs:

[0031] Stator 1

[0032] Rotor 2

[0033] Rotor house 21

[0034] Through hole 211

[0035] Magnetic pole module 22

[0036] First end face 221

[0037] Second end face 222

[0038] Permanent magnet 223

[0039] Permanent magnet support 224

[0040] Gap 23

[0041] Air gap 3 DETAILED DESCRIPTION

[0042] The application will be further described by way of example only with reference to the accompanying drawings.

[0043] The application provides a permanent magnet motor, as shown in Figure 1 and Figure 2 . The permanent magnet motor comprises a stator 1 and a rotor 2, the inner circumferential side of the stator 1 is provided with a plurality of radially arranged air ducts, the rotor 2 is arranged at the inner circumferential side of the stator 1, the rotor 2 comprises a rotor house 21 and a plurality of magnetic pole modules 22, the plurality of magnetic pole modules 22 are arranged at the outer circumferential side of the rotor house 21 along the circumferential direction of the rotor house 21, and the gap 23 between adjacent magnetic pole modules 22 extends outwardly and obliquely from the outer wall of the rotor house 21 in a direction away from the rotation direction of the rotor house 21.

[0044] In this embodiment, the magnetic pole modules 22 adopt an asymmetric structure, and the gap 23 between adjacent magnetic pole modules 22 forms an air channel that is inclined to one side, which is inclined to the direction away from the rotation direction of the rotor house 21. Please refer to Figure 1 and Figure 2 for understanding, Figure 1 and Figure 2 , the arrowed arc line indicates the rotation direction of the rotor 2 (i.e. the rotation direction of the rotor house 21), the rotor 2 rotates clockwise, and the air channel is inclined to the left side. During the rotation of the rotor 2, the air in the gap 23 is driven to flow outward, and the air in the air gap 3 between the stator 1 and the rotor 2 is driven to flow, which cools the permanent magnet motor, reduces the air flow resistance and wind friction loss, and enhances the heat dissipation of the permanent magnet motor. In addition, during the rotation of the rotor 2, the resistance during the rotation of the rotor 2 is reduced, the mechanical loss of the rotor 2 is reduced, and the efficiency of the permanent magnet motor is improved.

[0045] In this embodiment, as shown in Figure 1 , in the circumferential direction of the rotor house 21, a single magnetic pole module 22 has oppositely arranged first and second end faces 221 and 222, wherein the direction from the first end face 221 to the second end face 222 is defined as the rotation direction of the rotor house 21, and the angle between the second end face 222 and the linear velocity direction of the rotor 2 is greater than 90 degrees. In other words, the second end face 222 of one of the magnetic pole modules 22 and the first end face 221 of the adjacent magnetic pole module 22 form the air channel described above, and the angle between the side wall (the second end face 222) of the air channel away from the rotation direction of the rotor house 21 and the linear velocity direction of the rotor 2 is greater than 90 degrees, i.e. along the rotation direction of the rotor house 21, the angle between the second end face 222 and the linear velocity direction at the connection between the second end face 222 and the rotor house 21 is greater than 90 degrees. Please refer to Figure 1For better understanding, the left side wall (the second end surface 222) of the air passage extends obliquely to the left when the rotor 2 rotates clockwise. With the foregoing structure, the second end surface 222 extends obliquely to one side, and the flow resistance is further reduced during the rotation of the rotor 2, the air flow is driven to cool the permanent magnet motor, the heat dissipation of the permanent magnet motor is enhanced, the mechanical loss of the rotor 2 is further reduced, and the efficiency of the permanent magnet motor is improved.

[0046] Preferably, the angle between the second end surface 222 and the direction of the linear velocity of the rotor 2 is greater than 90 degrees, and the angle between the first end surface 221 and the direction of the linear velocity of the rotor 2 is also greater than 90 degrees, further reducing the air flow resistance. Preferably, the first end surface 221 and the second end surface 222 are arranged in parallel.

[0047] A through hole 211 is formed in the area of the rotor house 21 opposite to the gap 23, and the through hole 211 extends obliquely from the inner wall of the rotor house 21 away from the rotation direction of the rotor house 21. During the rotation of the rotor 2, the cooling air is driven to enter the air gap 3 between the stator 1 and the rotor 2 from the inside of the rotor house 21 along the through hole 211, the cooling area of the rotor 2 is increased, the air flow path of the rotor 2 is improved, the flow resistance is reduced, and the heat dissipation of the rotor 2 is enhanced, thereby further enhancing the heat dissipation of the permanent magnet motor. Preferably, the angle between the axis direction of the through hole 211 and the direction of the linear velocity of the rotor 2 is not less than the angle between the length direction of the gap 23 and the direction of the linear velocity of the rotor 2. In other words, the inclination direction of the through hole 211 is consistent with the inclination direction of the gap 23, or the through hole 211 is arranged obliquely relative to the gap 23 away from the rotation direction of the rotor house 21. The air flow resistance during the rotation of the rotor 2 is further reduced, the mechanical loss of the rotor 2 is reduced, and the heat dissipation of the rotor 2 is further enhanced.

[0048] In the present embodiment, the number of through holes 211 is multiple. During the rotation of the rotor 2, the cooling air is driven to enter the air gap 3 between the stator 1 and the rotor 2 from the inside of the rotor house 21 along the multiple through holes 211, the cooling area of the rotor 2 is further increased, the flow resistance is further reduced, and the heat dissipation of the rotor 2 is further enhanced.

[0049] The number of through holes 211 is multiple along the axial direction of the rotor house 21, and the cooling area of the rotor 2 is increased in the axial direction of the rotor 2, the heat dissipation of the rotor 2 is enhanced, the air flow resistance is further reduced, and the through hole 211 is arranged along the axial direction of the rotor 2, which is convenient for processing. In other embodiments, the number of through holes 211 is multiple along the circumferential direction of the rotor house 21, and the cooling area of the rotor 2 is increased in the circumferential direction of the rotor 2, the heat dissipation of the rotor 2 is enhanced, the air flow resistance is further reduced; or, the number of through holes 211 is multiple along the axial direction of the rotor house 21, and the number of through holes 211 can also be multiple along the circumferential direction of the rotor house 21.

[0050] Along the axial direction of the rotor house 21, the number of the magnetic pole modules 22 is multiple, and the multiple magnetic pole modules 22 are arranged in a staggered manner along the circumferential direction of the rotor house 21. It can be understood that the latter magnetic pole module 22 is arranged to be offset to the left or right relative to the former magnetic pole module 22. By using the foregoing structure, the motor torque fluctuation is reduced, and the motor operation stability is enhanced. Figure 2

[0051] In the embodiment, along the axial direction of the rotor house 21, the multiple magnetic pole modules 22 are arranged in a close manner, the influence on the electromagnetic performance is reduced or avoided, and the stability of the permanent magnet motor operation is enhanced.

[0052] The magnetic pole module 22 comprises a permanent magnet 223 and a permanent magnet support 224, the permanent magnet 223 is arranged inside the permanent magnet support 224, and the permanent magnet support 224 is formed by laminating and pressing a laminated plate.

[0053] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application 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 the present application, and these changes and modifications all fall within the protection scope of the present application.​

Claims

1. A permanent magnet motor, characterized in that, The permanent magnet motor includes: stator; The rotor is spaced apart on the inner periphery of the stator. The rotor includes a rotor housing and multiple magnetic pole modules. The multiple magnetic pole modules are spaced apart along the circumferential direction of the rotor housing and are located on the outer periphery of the rotor housing. The gap between adjacent magnetic pole modules extends obliquely outward from the outer wall of the rotor housing along the rotation direction opposite to that of the rotor housing. A through hole is formed in the region of the rotor housing opposite to the gap, and the through hole extends obliquely outward from the inner wall of the rotor housing along the direction of rotation away from the rotor housing.

2. The permanent magnet motor as described in claim 1, characterized in that, In the circumferential direction of the rotor housing, a single magnetic pole module has a first end face and a second end face arranged opposite to each other, wherein the direction of rotation of the rotor housing extends from the first end face to the second end face, and the angle between the second end face and the direction of the rotor rotational linear velocity is greater than 90 degrees.

3. The permanent magnet motor as described in claim 2, characterized in that, The first end face and the second end face are arranged in parallel.

4. The permanent magnet motor as described in claim 1, characterized in that, The angle between the axial direction of the through hole and the direction of the rotor's rotational linear velocity is not less than the angle between the length direction of the gap and the direction of the rotor's rotational linear velocity.

5. The permanent magnet motor as described in claim 1, characterized in that, The number of through holes is multiple.

6. The permanent magnet motor as described in claim 5, characterized in that, Along the axial direction of the rotor housing, there are multiple through holes; And / or, along the circumferential direction of the rotor housing, the number of through holes is multiple.

7. The permanent magnet motor as described in claim 1, characterized in that, Along the axial direction of the rotor housing, there are multiple magnetic pole modules, and the multiple magnetic pole modules are staggered along the circumferential direction of the rotor housing.

8. The permanent magnet motor as described in claim 7, characterized in that, Along the axial direction of the rotor housing, a plurality of magnetic pole modules are fitted together.

9. The permanent magnet motor as described in claim 1, characterized in that, The magnetic pole module includes a permanent magnet and a permanent magnet support. The permanent magnet is placed inside the permanent magnet support, which is formed by stacking laminates.

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