Permanent magnet synchronous motor rotor and permanent magnet motor

Abstract

This invention provides a permanent magnet synchronous motor rotor and a permanent magnet motor. The permanent magnet synchronous motor rotor includes a rotor core and permanent magnets. The permanent magnets include a primary permanent magnet and a secondary permanent magnet connected to each other. The rotor includes multiple magnetic poles, with a magnetic pole boundary line between two adjacent magnetic poles. The center line of the primary permanent magnet is inclined with respect to its nearest magnetic pole boundary line, forming a non-zero angle A. The center line of the secondary permanent magnet is also inclined with respect to its nearest magnetic pole boundary line, forming a non-zero angle M. M and A satisfy the following relationship: 0.3 ≤ M / A. According to this invention, the angle between the primary and secondary permanent magnets and the armature magnetic field lines can be increased, reducing the demagnetization rate of the primary and secondary permanent magnets, thereby improving the motor's anti-demagnetization capability. Simultaneously, it increases the magnetic flux supplied by the primary and secondary permanent magnets to the air gap, increasing the motor's flux linkage, reducing the motor's operating current, reducing copper losses, and improving motor efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a permanent magnet synchronous motor rotor and a permanent magnet motor. Background Technology

[0002] Motors with tangential magnetization of permanent magnets have a "magnetic focusing" effect, which can generate a higher air gap magnetic flux density than motors with radial magnetization of permanent magnets. This results in motors with a larger torque / current ratio and torque / volume ratio, and they are increasingly being used in servo systems, electric traction, office automation, home appliances and other applications.

[0003] Existing tangential permanent magnet motors use a magnetic circuit structure with single permanent magnets connected in parallel. The rotor permanent magnet operating point is lower than that of radial permanent magnet motors, which can easily lead to a decrease in motor efficiency. Furthermore, there is a risk of demagnetization in harsh environments, which can cause the motor to fail to operate.

[0004] Because existing permanent magnet motors suffer from problems such as poor demagnetization resistance, low motor flux linkage, high operating current, high copper loss, low efficiency, and easy demagnetization of the secondary permanent magnet, this invention researches and designs a permanent magnet synchronous motor rotor and a permanent magnet motor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor anti-demagnetization ability of permanent magnet motors in the prior art, thereby providing a permanent magnet synchronous motor rotor and a permanent magnet motor.

[0006] To solve the above problems, the present invention provides a permanent magnet synchronous motor rotor, which includes: a rotor core and permanent magnets. The permanent magnets are disposed on the rotor core and extend along the radial direction of the rotor core. There are N permanent magnets, N≥2, and the N permanent magnets are arranged sequentially at intervals along the circumferential direction of the rotor core. The opposite sides of each pair of adjacent permanent magnets have the same polarity.

[0007] The permanent magnet comprises a main permanent magnet and a secondary permanent magnet connected to each other. The main permanent magnet is located radially outside the secondary permanent magnet. The rotor comprises multiple magnetic poles, with a magnetic pole boundary line between two adjacent magnetic poles. The center line of the main permanent magnet is inclined with respect to its nearest magnetic pole boundary line, and there is a non-zero angle A. The center line of the secondary permanent magnet is inclined with respect to its nearest magnetic pole boundary line, and there is a non-zero angle M. The inclination direction of the center line of the secondary permanent magnet is consistent with the inclination direction of the center line of the main permanent magnet, and M and A satisfy the following relationship: 0.3≤M / A. The magnetic pole boundary line refers to the straight line connecting the center of the rotor circle and the midpoint of the outer side of the main permanent magnet near the outer circle.

[0008] In some implementations, M and A also satisfy the following relationship: M / A≤3.5.

[0009] In some implementations, the circumferential angle occupied by each magnetic pole of the rotor is B, and A and B satisfy the following relationship: A / B≥0.3.

[0010] In some embodiments, the center line of the secondary permanent magnet is parallel to the center line of the primary permanent magnet to which it is connected.

[0011] In some embodiments, within the end face of the rotor core, the main permanent magnet includes a first inclined front side located counterclockwise and a first inclined rear side located counterclockwise. The center line of the secondary permanent magnet is positioned closer to the first inclined rear side relative to the first inclined front side. The inner side of the secondary permanent magnet is positioned closer to the first inclined rear side relative to the first inclined front side. The inner side is the innermost radial side of the secondary permanent magnet.

[0012] In some embodiments, within the end face of the rotor core, the secondary permanent magnet includes a second inclined front side located counterclockwise and a second inclined rear side located counterclockwise, the second inclined rear side being on the same straight line as the first inclined rear side.

[0013] In some embodiments, within the end face of the rotor core, the main permanent magnet includes a first inclined front side located counterclockwise and a first inclined rear side located counterclockwise. The center line of the secondary permanent magnet is positioned closer to the first inclined front side relative to the first inclined rear side. The inner side of the secondary permanent magnet is positioned closer to the first inclined front side relative to the first inclined rear side. The inner side is the innermost radial side of the secondary permanent magnet.

[0014] In some embodiments, within the end face of the rotor core, the secondary permanent magnet includes a second inclined front side located counterclockwise and a second inclined rear side located counterclockwise, the second inclined front side and the first inclined front side being on the same straight line.

[0015] In some embodiments, the main permanent magnet is a rectangular permanent magnet, and its projection on the end face of the rotor core is rectangular; the secondary permanent magnet is a rectangular permanent magnet, and its projection on the end face of the rotor core is rectangular.

[0016] In some embodiments, the length of the long side of the secondary permanent magnet is set to O, and the rotor radius is set to N, where O and N satisfy the following relationship: 0.2≤O / N≤0.6.

[0017] In some embodiments, the length of the long side of the secondary permanent magnet is set to O, and the length of the long side of the primary permanent magnet is set to P, where O and P satisfy the following relationship: 0.2≤O / P≤1.

[0018] In some embodiments, within the end face of the rotor core, the main permanent magnet includes a first inclined front side located counterclockwise and a first inclined rear side located counterclockwise.

[0019] The inner side of the secondary permanent magnet is located close to the first inclined rear side of the primary permanent magnet, and the outer top of the secondary permanent magnet is located close to the first inclined front side of the primary permanent magnet. The inclined front vertex of the secondary permanent magnet is on the extension line of the first inclined front side of the primary permanent magnet. The inner side is the innermost side of the secondary permanent magnet in the radial direction. The outer top is the outermost position of the secondary permanent magnet in the radial direction. The inclined front vertex is the frontmost position of the secondary permanent magnet in the counterclockwise direction.

[0020] In some embodiments, within the end face of the rotor core, the main permanent magnet includes a first inclined front side located counterclockwise and a first inclined rear side located counterclockwise.

[0021] The outer top of the secondary permanent magnet is located close to the first inclined front side of the primary permanent magnet. The apex of the inclined front side of the secondary permanent magnet extends beyond the extension line of the first inclined front side of the primary permanent magnet. The shortest distance between the apex of the inclined front side and its adjacent primary permanent magnet is set as C. The thickness of the primary permanent magnet is set as D. C and D satisfy the following relationship: 0.5≤D / C≤1.1.

[0022] The outermost top is the radially outermost position of the secondary permanent magnet, and the inclined front vertex is the counterclockwise foremost position of the secondary permanent magnet.

[0023] In some embodiments, the centerline of the secondary permanent magnet is parallel to the centerline of the primary permanent magnet located counterclockwise in front of it.

[0024] In some embodiments, the coercivity of the secondary permanent magnet is higher than that of the primary permanent magnet, and the remanence of the secondary permanent magnet is higher than that of the primary permanent magnet.

[0025] The present invention also provides a permanent magnet motor comprising the permanent magnet synchronous motor rotor described in any of the preceding claims.

[0026] The permanent magnet synchronous motor rotor and permanent magnet motor provided by this invention have the following beneficial effects:

[0027] This invention employs a secondary permanent magnet outside the primary permanent magnet. The primary permanent magnet is inclined relative to the rotor centerline, and the secondary permanent magnet is inclined relative to the primary permanent magnet. An angle A is formed between the primary permanent magnet and the rotor centerline, and an angle M is formed between the secondary permanent magnet and the rotor centerline, where 0.3 ≤ M / A ≤ 3.5. This allows the secondary permanent magnet to be closer to the inclined front side of the primary permanent magnet. By utilizing the limited space of the rotor, the area of ​​the primary and secondary permanent magnets is increased, as is the angle between the primary and secondary permanent magnets and the magnetic field lines of the armature magnetic field. This reduces the demagnetization rate of the primary and secondary permanent magnets, thereby improving the motor's anti-demagnetization capability. Simultaneously, it increases the magnetic flux supplied by the primary and secondary permanent magnets to the air gap, increasing the motor's flux linkage, reducing the motor's operating current, reducing copper losses, and improving motor efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of Embodiment 1 of the novel tangential motor rotor structure of the present invention;

[0029] Figure 2 This is a schematic diagram of Embodiment 2 of the novel tangential motor rotor structure of the present invention;

[0030] Figure 3 This is a schematic diagram of Embodiment 3 of the novel tangential motor rotor structure of the present invention;

[0031] Figure 4 This is a schematic diagram of Embodiment 4 of the novel tangential motor rotor structure of the present invention;

[0032] Figure 5 This is a comparison diagram of the magnetic flux linkage between the novel tangential motor of the present invention and an existing motor;

[0033] Figure 6 This is a comparison chart of the motor efficiency of the novel tangential motor of the present invention and existing motors;

[0034] Figure 7 This is a comparison diagram of the demagnetizing current of the novel tangential motor of the present invention and an existing motor.

[0035] The reference numerals in the attached figures are as follows:

[0036] 1. Rotor core; O, center; P, midpoint of the outer side of the main permanent magnet; 10. Magnetic pole; 11. Magnetic pole boundary line; 111. Left magnetic pole boundary line; 112. Right magnetic pole boundary line; 2. Permanent magnet; 21. Main permanent magnet; 22. Secondary permanent magnet; 23. Center line of the main permanent magnet; 24. Center line of the secondary permanent magnet; 25. First inclined front side; 26. First inclined rear side; 27. Second inclined front side; 28. Second inclined rear side; 29. ​​Inner side; 30. Outer top; 31. Inclined front vertex. Detailed Implementation

[0037] like Figure 1-7As shown, the present invention provides a permanent magnet synchronous motor rotor, which includes: a rotor core 1 and permanent magnets 2. The permanent magnets 2 are disposed on the rotor core and extend along the radial direction of the rotor core. There are N permanent magnets, N≥2, and the N permanent magnets 2 are arranged sequentially at intervals along the circumferential direction of the rotor core 1. The opposite sides of every two adjacent permanent magnets 2 have the same polarity.

[0038] The permanent magnet 2 includes a main permanent magnet 21 and a secondary permanent magnet 22 connected to each other. The main permanent magnet 21 is located radially outside the secondary permanent magnet 22. The rotor includes multiple magnetic poles 10. There is a magnetic pole dividing line 11 between two adjacent magnetic poles 10. The main permanent magnet center line 23 of the main permanent magnet 21 is inclined with respect to its nearest magnetic pole dividing line 11, and there is an angle A that is not zero. The secondary permanent magnet center line 24 of the secondary permanent magnet 22 is inclined with respect to its nearest magnetic pole dividing line 11, and there is an angle M that is not zero. The inclination direction of the secondary permanent magnet center line is consistent with the inclination direction of the main permanent magnet center line, and M and A satisfy the following relationship: 0.3≤M / A. The magnetic pole dividing line refers to the straight line connecting the rotor center (center O) and the midpoint of the outer side of the main permanent magnet (the outer midpoint P of the main permanent magnet).

[0039] This invention provides a permanent magnet synchronous motor rotor, characterized in that it comprises: a rotor core, and N spoke-shaped permanent magnets arranged circumferentially on the rotor core and extending radially therefrom. Each pair of adjacent spoke-shaped permanent magnets has the same polarity on their facing sides. Each spoke-shaped permanent magnet consists of at least two segments: a main permanent magnet closer to the shaft side, and a secondary permanent magnet arranged outside the main permanent magnet, closer to the outer circumference of the rotor. The main permanent magnets have opposite magnetic poles. The dividing line is inclined. The magnetic pole dividing line refers to the straight line connecting the center of the circle and the midpoint of the outer side of the main permanent magnet. There is an angle between the main permanent magnet and the magnetic pole dividing line, which is set as A. Angle A can be on the counterclockwise side of the center line of the outer circle of the rotor or on the clockwise side of the center line of the outer circle of the rotor. The auxiliary permanent magnet is inclined relative to the magnetic pole dividing line. The inclination direction of the auxiliary permanent magnet is the same as the inclination direction of the main permanent magnet. An angle is formed between the auxiliary permanent magnet and the magnetic pole dividing line, which is set as M. M and A should satisfy the following relationship: 0.3≤M / A.

[0040] Because spoke-type permanent magnet motors use a magnetic circuit structure with single permanent magnets connected in parallel, the rotor permanent magnet operating point is lower than that of radial permanent magnet motors, which easily leads to a decrease in the efficiency of spoke-type permanent magnet synchronous motors. Furthermore, spoke-type permanent magnet synchronous motors are at risk of demagnetization in harsh environments. This invention addresses this by setting a secondary permanent magnet outside the main permanent magnet, close to the outer circle of the rotor, with both the main and secondary permanent magnets tilted. This increases the amount of permanent magnets used within a limited space, thereby increasing the motor flux linkage, improving the motor output torque, increasing the motor efficiency, reducing the demagnetizing effect of the armature magnetic field on the secondary permanent magnet, and improving the motor's resistance to demagnetization.

[0041] The technical problem solved by this invention:

[0042] 1. Solve the problem of poor demagnetization resistance in motors;

[0043] 2. Solve the problem of low motor flux and high operating current;

[0044] 3. Solve the problems of high copper loss and low efficiency in motors;

[0045] 4. Solve the problem of easy demagnetization of the secondary permanent magnet.

[0046] In some implementations, M and A also satisfy the following relationship: M / A ≤ 3.5. This invention controls the inclination of the secondary permanent magnet relative to the magnetic pole boundary line. If the inclination is too large, the span of the secondary permanent magnet in the rotor radial direction is too small, reducing the effective magnetic flux of the motor. When M / A ≤ 3.5, it is possible to increase the length of the secondary permanent magnet while ensuring the tangential magnetic flux component of the motor, thereby further increasing the motor flux linkage, further increasing the motor torque, and improving the motor efficiency.

[0047] In some embodiments, the circumferential angle occupied by each magnetic pole of the rotor is B, and A and B satisfy the following relationship: A / B ≥ 0.3. This invention, through this range, can increase the tilt angle of the main permanent magnet relative to the magnetic pole boundary line, increase the length of the main permanent magnet within the rotor, increase the effective magnetic flux area of ​​the main permanent magnet, increase the motor flux linkage and torque, improve motor efficiency, and, while considering the tilt of the secondary permanent magnet, the combined effect of the main and secondary permanent magnets further increases the total motor torque.

[0048] In some embodiments, the center line 24 of the secondary permanent magnet is parallel to the center line 23 of the primary permanent magnet to which it is connected. More preferably, the parallelism between the secondary and primary permanent magnets increases the effective magnetic flux area of ​​the permanent magnets while reducing pole asymmetry, decreasing air gap harmonic distortion, reducing harmonic losses, and simultaneously reducing the obstruction of the secondary permanent magnets from the transmission of magnetic flux from the primary permanent magnets to the air gap, thus improving the utilization rate of the permanent magnets.

[0049] like Figure 1In some embodiments, within the end face of the rotor core 1, the main permanent magnet 21 includes a first inclined front side 25 located counterclockwise and a first inclined rear side 26 located counterclockwise. The center line 24 of the secondary permanent magnet is positioned closer to the first inclined rear side 26 relative to the first inclined front side 25. The inner side of the secondary permanent magnet 22 is positioned closer to the first inclined rear side 26 relative to the first inclined front side 25. The inner side is the innermost radial side of the secondary permanent magnet 22.

[0050] In some embodiments, within the end face of the rotor core 1, the secondary permanent magnet 22 includes a second inclined front side 27 located counterclockwise in front and a second inclined rear side 28 located counterclockwise behind, the second inclined rear side 28 being on the same straight line as the first inclined rear side 26.

[0051] like Figure 2 In some embodiments, within the end face of the rotor core 1, the main permanent magnet 21 includes a first inclined front side 25 located counterclockwise in front and a first inclined rear side 26 located counterclockwise behind. The center line 24 of the secondary permanent magnet is positioned closer to the first inclined front side 25 relative to the first inclined rear side 26. The inner side of the secondary permanent magnet 22 is positioned closer to the first inclined front side 25 relative to the first inclined rear side 26. The inner side is the innermost radial side of the secondary permanent magnet 22. In a further preferred embodiment of the present invention, the secondary permanent magnet is closer to the inclined front side of the primary permanent magnet, and the bottom of the inner side of the secondary permanent magnet is close to the inclined front side of the primary permanent magnet. The distance from the inclined front side to the outer circle of the rotor is larger than the distance from the inclined rear side to the outer circle of the rotor, which is more conducive to arranging the inclined secondary permanent magnet, further increasing the length of the secondary permanent magnet, increasing the effective magnetic flux area of ​​the secondary permanent magnet, increasing the motor flux linkage, increasing the motor torque, and increasing the motor efficiency. At the same time, it reduces the proportion of the demagnetization area of ​​the secondary permanent magnet and improves the anti-demagnetization capability.

[0052] like Figure 2 In some embodiments, within the end face of the rotor core 1, the secondary permanent magnet 22 includes a second inclined front side 27 located counterclockwise forward and a second inclined rear side 28 located counterclockwise backward, with the second inclined front side 27 and the first inclined front side 25 lying on the same straight line. This invention, by aligning the inclined front side of the secondary permanent magnet with the inclined front side of the primary permanent magnet, increases the effective magnetic flux area of ​​the permanent magnet while reducing the asymmetry of the magnetic poles, decreasing the air gap harmonic distortion rate, ensuring the length of the permanent magnet, and facilitating the arrangement of regularly shaped secondary and primary permanent magnets.

[0053] In some embodiments, the main permanent magnet 21 is a rectangular permanent magnet, and its projection onto the end face of the rotor core 1 is rectangular; the secondary permanent magnet 22 is also a rectangular permanent magnet, and its projection onto the end face of the rotor core 1 is rectangular. More preferably, the main permanent magnet is a rectangular permanent magnet, which improves the manufacturability of the permanent magnet, while reducing the scrap rate of the permanent magnet material, thus reducing the material cost and processing cost. More preferably, the secondary permanent magnet is a rectangular permanent magnet, which improves the manufacturability of the permanent magnet, while reducing the scrap rate of the permanent magnet material, thus reducing the material cost and processing cost, lowering the total cost of the motor, and improving the motor's cost-effectiveness.

[0054] In some embodiments, the length of the long side of the secondary permanent magnet 22 is set to O, and the rotor radius is set to N, where O and N satisfy the following relationship: 0.2≤O / N≤0.6. This invention, by using 0.2≤O / N≤0.6, can increase the length ratio of the secondary permanent magnet within the rotor, increase the magnetic flux contributed by the secondary permanent magnet, increase motor torque, and improve motor efficiency.

[0055] In some embodiments, the long side length of the secondary permanent magnet 22 is set to O, and the long side length of the primary permanent magnet 21 is set to P, where O and P satisfy the following relationship: 0.2 ≤ O / P ≤ 1. This invention, by using 0.2 ≤ O / P ≤ 1, can control the permanent magnet volume ratio between the secondary and primary permanent magnets, and thus control the proportion of magnetic flux contribution between them, thereby optimizing the total magnetic flux of the motor. This achieves the goal of ensuring magnetic flux while reducing motor cost and improving motor magnetic flux and efficiency when using different materials for the primary and secondary permanent magnets.

[0056] like Figure 3 In some embodiments, within the end face of the rotor core 1, the main permanent magnet 21 includes a first inclined front side 25 located counterclockwise in front and a first inclined rear side 26 located counterclockwise behind.

[0057] The inner side 29 of the secondary permanent magnet 22 is disposed near the first inclined rear side 26 of the primary permanent magnet 21, and the outer top 30 of the secondary permanent magnet 22 is disposed near the first inclined front side 25 of the primary permanent magnet 21. The inclined front vertex 31 of the secondary permanent magnet 22 is on the extension line of the first inclined front side 25 of the primary permanent magnet 21. The inner side is the innermost side of the secondary permanent magnet 22 in the radial direction, the outer top 30 is the outermost position of the secondary permanent magnet 22 in the radial direction, and the inclined front vertex 31 is the frontmost position of the secondary permanent magnet 22 in the counterclockwise direction.

[0058] In this invention, the inner bottom of the secondary permanent magnet is close to the inclined rear side of the primary permanent magnet, and the outer top of the secondary permanent magnet is close to the inclined front side of the primary permanent magnet. The apex of the inclined front side of the secondary permanent magnet is on the extension line of the inclined front side of the primary permanent magnet, and the apex is the point farthest from the magnetic pole boundary line. This can further utilize the limited space outside the rotor, increase the length of the secondary permanent magnet, increase the effective magnetic flux of the secondary permanent magnet, increase the motor flux linkage, and improve the motor torque and efficiency.

[0059] like Figure 4 In some embodiments, within the end face of the rotor core 1, the main permanent magnet 21 includes a first inclined front side 25 located counterclockwise in front and a first inclined rear side 26 located counterclockwise behind.

[0060] The outer top 30 of the secondary permanent magnet 22 is located close to the first inclined front side 25 of the primary permanent magnet. The inclined front vertex 31 of the secondary permanent magnet 22 extends beyond the extension line of the first inclined front side 25 of the primary permanent magnet. The shortest distance between the inclined front vertex 31 and its adjacent primary permanent magnet is set as C. The thickness of the primary permanent magnet is set as the short side width of its projection in the rotor core end face. C and D satisfy the following relationship: 0.5≤D / C≤1.1.

[0061] The outer top 30 is the outermost radial position of the secondary permanent magnet 22, and the inclined front vertex 31 is the frontmost counterclockwise position of the secondary permanent magnet 22.

[0062] By defining the aforementioned further features, this invention can increase the angle spanned by the combined tilt of the auxiliary permanent magnet and the main permanent magnet, which is greater than the angle occupied by one magnetic pole of the rotor. In some cases, the auxiliary permanent magnet on the right side can even cross the main permanent magnet on the left side, and a portion of the radial outer angle range of the main permanent magnet on the left side is occupied by the auxiliary permanent magnet on the right side. This increases the length of the permanent magnet, increases the overall magnetic flux, and improves the motor torque and efficiency. At the same time, this tilted permanent magnet configuration disperses the demagnetizing effect of the armature magnets, reduces the demagnetizing effect of the armature demagnetizing magnetic field on the main permanent magnet, reduces the area ratio of the permanent magnet demagnetization region, and improves the overall demagnetization resistance of the motor.

[0063] In some embodiments, the center line 24 of the secondary permanent magnet 22 is parallel to the center line 23 of the primary permanent magnet located counterclockwise in front of it. The present invention further preferably places the right-side secondary permanent magnet parallel to the left-side (tilted front) primary permanent magnet, which ensures equal width at all points inside the magnetic poles, increases the permanent magnet length while reducing the magnetic flux blocking effect of the outer permanent magnet on the inner permanent magnet, and improves the overall magnetic flux linkage of the motor.

[0064] In some embodiments, the coercivity of the secondary permanent magnet is higher than that of the primary permanent magnet, and the remanence of the secondary permanent magnet is higher than that of the primary permanent magnet. Preferably, the material of the primary permanent magnet is ferrite, and the material of the secondary permanent magnet is neodymium iron boron (NdFeB). In a further preferred embodiment, the coercivity and remanence of the secondary permanent magnet are higher than those of the primary permanent magnet. For example, if the material of the primary permanent magnet is ferrite, and the material of the secondary permanent magnet is neodymium iron boron, since the magnetic force of NdFeB is stronger than that of ferrite, the primary permanent magnet uses a ferrite material with lower magnetic properties, while the permanent magnet that guides the demagnetizing magnetic field, i.e., the secondary permanent magnet, uses NdFeB with higher magnetic properties. By not using NdFeB materials simultaneously, the utilization rate of the permanent magnets is improved, efficiency is increased, and the cost of the motor is reduced.

[0065] The present invention also provides a permanent magnet motor comprising a permanent magnet synchronous motor rotor as described in any of the preceding claims. Because the motor of the present invention comprises the aforementioned permanent magnet synchronous motor rotor, it has the advantages of high anti-demagnetization capability, high motor efficiency, and low demagnetization rate of the secondary permanent magnet.

[0066] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A permanent magnet synchronous motor rotor, characterized in that, include: The rotor core (1) and permanent magnets (2) are provided on the rotor core and extend along the radial direction of the rotor core. There are N permanent magnets, N≥2, and the N permanent magnets (2) are arranged sequentially along the circumferential direction of the rotor core (1). The opposite sides of each pair of adjacent permanent magnets (2) have the same polarity. The permanent magnet (2) includes a main permanent magnet (21) and a secondary permanent magnet (22) connected to each other. The main permanent magnet (21) is located radially inside the secondary permanent magnet (22). The rotor includes multiple magnetic poles (10), with a magnetic pole dividing line (11) between two adjacent magnetic poles (10). The center line (23) of the main permanent magnet (21) is inclined between itself and its nearest magnetic pole dividing line (11), and there exists a non-zero value. Angle A, the sub-permanent magnet centerline (24) of the sub-permanent magnet (22) is inclined between its nearest magnetic pole boundary line (11) and there is an angle M that is not 0. The sub-permanent magnet centerline and the main permanent magnet centerline are both inclined toward the same side of their nearest magnetic pole boundary line (11), and M and A satisfy the following relationship: 0.3≤M / A. The magnetic pole boundary line refers to the straight line connecting the rotor center and the midpoint of the outer side of the main permanent magnet near the outer circle.

2. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: M and A also satisfy the following relationship: M / A≤3.

5.

3. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The circumferential angle occupied by each magnetic pole of the rotor is B, and A and B satisfy the following relationship: A / B≥0.

3.

4. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The sub-permanent magnet centerline (24) of the sub-permanent magnet is parallel to the main permanent magnet centerline (23) of the main permanent magnet that is connected to it.

5. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: Within the end face of the rotor core (1), the main permanent magnet (21) includes a first inclined front side (25) located counterclockwise in front and a first inclined rear side (26) located counterclockwise behind. The center line (24) of the secondary permanent magnet is positioned closer to the first inclined rear side (26) relative to the first inclined front side (25). The inner side of the secondary permanent magnet (22) is positioned closer to the first inclined rear side (26) relative to the first inclined front side (25). The inner side is the innermost side of the secondary permanent magnet (22) in the radial direction.

6. The permanent magnet synchronous motor rotor according to claim 5, characterized in that: Within the end face of the rotor core (1), the secondary permanent magnet (22) includes a second inclined front side (27) located counterclockwise in front and a second inclined rear side (28) located counterclockwise behind, the second inclined rear side (28) and the first inclined rear side (26) being on the same straight line.

7. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: Within the end face of the rotor core (1), the main permanent magnet (21) includes a first inclined front side (25) located counterclockwise in front and a first inclined rear side (26) located counterclockwise behind. The center line (24) of the secondary permanent magnet is set closer to the first inclined front side (25) relative to the first inclined rear side (26). The inner side of the secondary permanent magnet (22) is set closer to the first inclined front side (25) relative to the first inclined rear side (26). The inner side is the innermost side of the secondary permanent magnet (22) in the radial direction.

8. The permanent magnet synchronous motor rotor according to claim 7, characterized in that: Within the end face of the rotor core (1), the secondary permanent magnet (22) includes a second inclined front side (27) located counterclockwise in front and a second inclined rear side (28) located counterclockwise behind, with the second inclined front side (27) and the first inclined front side (25) on the same straight line.

9. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The main permanent magnet (21) is a rectangular permanent magnet, and its projection on the end face of the rotor core (1) is rectangular; the secondary permanent magnet (22) is a rectangular permanent magnet, and its projection on the end face of the rotor core (1) is rectangular.

10. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The length of the long side of the secondary permanent magnet (22) is set to O, and the rotor radius is set to N. O and N satisfy the following relationship: 0.2≤O / N≤0.

6.

11. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The length of the long side of the secondary permanent magnet (22) is set to O, and the length of the long side of the primary permanent magnet (21) is set to P. O and P satisfy the following relationship: 0.2≤O / P≤1.

12. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: Within the end face of the rotor core (1), the main permanent magnet (21) includes a first inclined front side (25) located counterclockwise in front and a first inclined rear side (26) located counterclockwise behind. The inner side (29) of the secondary permanent magnet (22) is located close to the first inclined rear side (26) of the main permanent magnet (21), and the outer top (30) of the secondary permanent magnet (22) is located close to the first inclined front side (25) of the main permanent magnet (21). The inclined front vertex (31) of the secondary permanent magnet (22) is on the extension line of the first inclined front side (25) of the main permanent magnet (21). The inner side is the innermost side of the secondary permanent magnet (22) in the radial direction. The outer top (30) is the outermost position of the secondary permanent magnet (22) in the radial direction. The inclined front vertex (31) is the frontmost position of the secondary permanent magnet (22) in the counterclockwise direction.

13. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: Within the end face of the rotor core (1), the main permanent magnet (21) includes a first inclined front side (25) located counterclockwise in front and a first inclined rear side (26) located counterclockwise behind. The outer top (30) of the secondary permanent magnet (22) is located close to the first inclined front side (25) of the main permanent magnet. The inclined front vertex (31) of the secondary permanent magnet (22) extends beyond the extension line of the first inclined front side (25) of the main permanent magnet. The shortest distance between the inclined front vertex (31) and its adjacent main permanent magnet is set as C. The thickness of the main permanent magnet is set as D. C and D satisfy the following relationship: 0.5≤D / C≤1.1; The outer top (30) is the outermost radial position of the secondary permanent magnet (22), and the inclined front vertex (31) is the frontmost counterclockwise position of the secondary permanent magnet (22).

14. The permanent magnet synchronous motor rotor according to any one of claims 1-13, characterized in that: The sub-permanent magnet centerline (24) of the sub-permanent magnet (22) is parallel to the main permanent magnet centerline (23) of the main permanent magnet located counterclockwise in front of it.

15. The permanent magnet synchronous motor rotor according to any one of claims 1-13, characterized in that: The coercivity of the secondary permanent magnet is higher than that of the primary permanent magnet, and the remanence of the secondary permanent magnet is higher than that of the primary permanent magnet.

16. A permanent magnet motor, characterized in that: The rotor of the permanent magnet synchronous motor includes any one of claims 1-15.

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