High-air-gap flux density hybrid pole permanent magnet motor rotor

Abstract

The invention discloses a high-air-gap flux density hybrid pole permanent magnet motor rotor, which comprises a rotor iron core, rectangular permanent magnets and Halbach array permanent magnets, and is characterized in that V-shaped grooves and linear grooves are uniformly distributed in the outer surface of the rotor iron core; the rectangular permanent magnets are arranged in the V-shaped grooves and form a V-shaped built-in permanent magnet structure, and the V-shaped built-in permanent magnet structure is used for suppressing torque pulsation during operation of the motor; according to the invention, the function of inhibiting torque ripple during motor operation through the V-shaped built-in permanent magnet structure is realized, and the function of improving the average torque output of the motor through the linear surface plug-in permanent magnet structure is realized, so that the operation stability and control precision of the motor are improved; and the motor can realize higher average torque and remarkably reduce torque pulsation while keeping a compact size, so that the energy efficiency ratio and the response speed of the motor are improved, the application potential of the motor in high-performance and high-efficiency applications is enhanced, and the motor is suitable for being widely popularized and used.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet motors, and in particular to a high air gap magnetic density mixed pole permanent magnet motor rotor. Background Art

[0002] Permanent magnet motors have the advantages of high power / torque density and high efficiency, and have been widely used in drive systems such as electric vehicles. Among them, built-in permanent magnet motors have additional reluctance torque, and compared with surface-mounted permanent magnet motors, built-in permanent magnet motors have higher power density and wider constant power speed regulation range, and have now become the most popular choice for electric vehicle drive systems.

[0003] At present, most of the existing permanent magnet motors use uniformly distributed permanent magnets, but while these permanent magnets provide high-efficiency output, they often cause the motor to produce obvious torque pulsation when running at low and high speeds. This torque pulsation not only affects the driving comfort of the motor, but may also have adverse effects on the mechanical system and the power system. In addition, the existing permanent magnet layout is generally difficult to meet the requirements of high average torque output and low torque fluctuation at the same time; therefore, it is necessary to design a high air gap magnetic density mixed pole permanent magnet motor rotor. Summary of the invention

[0004] The main purpose of the present invention is to solve the problem that most of the existing permanent magnet motors use evenly distributed permanent magnets, but these permanent magnets often cause obvious torque pulsation when the motor runs at low and high speeds while providing high-efficiency output. This torque pulsation not only affects the driving comfort of the motor, but may also have an adverse effect on the mechanical system and the power system, and the existing permanent magnet layout is generally difficult to meet the requirements of high average torque output and low torque fluctuation at the same time; the present invention provides a high air gap magnetic density mixed pole permanent magnet motor rotor, which realizes the function of suppressing torque pulsation when the motor is running by providing a V-shaped built-in permanent magnet structure, and the function of improving the average torque output of the motor by providing a straight-line surface inserted permanent magnet structure, thereby improving the running stability and control accuracy of the motor, and the motor can achieve higher average torque and significantly reduce torque pulsation while maintaining a compact size, which not only improves the energy efficiency ratio and response speed of the motor, but also enhances the application potential of the motor in high-performance and high-efficiency applications.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A high air gap magnetic density mixed pole permanent magnet motor rotor, comprising a rotor core, a rectangular permanent magnet and a Halbach array permanent magnet, wherein the outer surface of the rotor core is evenly distributed with V-shaped grooves and straight grooves; The rectangular permanent magnet is arranged inside the V-shaped groove to form a V-shaped built-in permanent magnet structure, and the V-shaped built-in permanent magnet structure is used to suppress torque pulsation when the motor is running; The Halbach array permanent magnet is embedded in the I-shaped groove on the surface of the rotor core to form an I-shaped surface-inserted permanent magnet structure, and the I-shaped surface-inserted permanent magnet structure is used to improve the average torque output of the motor; The magnetization direction of the rectangular permanent magnet in the V-shaped built-in permanent magnet structure and the magnetization direction of the Halbach array permanent magnet in the I-shaped surface inserted permanent magnet structure are combined to form a magnetic field concentration, and the magnetic field concentration is used to improve the output torque quality of the motor; The center line of the rectangular permanent magnet in the V-shaped built-in permanent magnet structure is aligned with the magnetic pole center line of the Halbach array permanent magnet in the I-shaped surface-inserted permanent magnet structure.

[0006] In the aforementioned high air gap magnetic density mixed pole permanent magnet motor rotor, the V-shaped groove is respectively provided with a first magnetic isolation bridge and a second magnetic isolation bridge on the inner side close to the rotor center and the outer side away from the rotor center, and the widths of the first magnetic isolation bridge and the second magnetic isolation bridge are 2mm and 1.5mm-2mm respectively.

[0007] In the aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, the rectangular permanent magnets in the V-shaped built-in permanent magnet structure and the Halbach array permanent magnets in the I-shaped surface inserted permanent magnet structure are both provided with semicircular first magnetic isolation grooves with a radius of 0.5 mm at both ends close to the inner side of the rotor center.

[0008] In the aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, a semicircular second magnetic isolation groove with a radius of 1 mm is provided at one end of the center line of the Halbach array permanent magnet in the I-shaped surface inserted permanent magnet structure close to the inner side of the rotor center.

[0009] In the aforementioned high air gap magnetic density mixed pole permanent magnet motor rotor, the number of the first magnetic isolation grooves and the second magnetic isolation grooves are both multiple, and the first magnetic isolation grooves, the second magnetic isolation grooves, the V-shaped grooves and the straight grooves are all interconnected to form magnetic barriers.

[0010] In the aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, the Halbach array permanent magnet in the I-shaped surface inserted permanent magnet structure is located in the middle of the rectangular permanent magnet in the V-shaped built-in permanent magnet structure.

[0011] In the aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, the Halbach array permanent magnet in the I-shaped surface inserted permanent magnet structure is composed of a first small permanent magnet, a second small permanent magnet and a large permanent magnet, and the first small permanent magnet and the second small permanent magnet are respectively distributed on both sides of the large permanent magnet.

[0012] In the aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, the first small permanent magnet and the second small permanent magnet have the same structure and size, the first small permanent magnet, the second small permanent magnet and the large permanent magnet all adopt a fan-shaped structure, the width ratio of the first small permanent magnet and the second small permanent magnet to the large permanent magnet is 1:7.93, and the thickness of the first small permanent magnet, the second small permanent magnet and the large permanent magnet is 3mm-4mm.

[0013] The aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, wherein the rectangular permanent magnets in the V-shaped built-in permanent magnet structure are magnetized along the width direction, and the magnetization direction of the Halbach array permanent magnets in the I-shaped surface insertion permanent magnet structure is determined by the first small permanent magnet, the second small permanent magnet and the large permanent magnet; The large permanent magnet is magnetized along the radial direction, the first small permanent magnet is magnetized along the bottom 53° direction, and the second small permanent magnet is magnetized along the bottom 143° direction.

[0014] In the aforementioned high air gap magnetic flux density mixed pole permanent magnet motor rotor, the magnetization directions of the rectangular permanent magnets in the two adjacent V-shaped built-in permanent magnet structures and the Halbach array permanent magnets in the I-shaped surface inserted permanent magnet structure are opposite, and the number of poles of the rectangular permanent magnets in the V-shaped built-in permanent magnet structure is the same as the number of poles of the Halbach array permanent magnets in the I-shaped surface inserted permanent magnet structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention firstly evenly distributes V-grooves and I-shaped grooves on the outer surface of the rotor core, then arranges rectangular permanent magnets inside the V-shaped grooves to form a V-shaped built-in permanent magnet structure, and then embeds Halbach array permanent magnets inside the I-shaped grooves on the surface of the rotor core to form an I-shaped surface inserted permanent magnet structure, which effectively realizes the function of suppressing torque pulsation during motor operation by arranging the V-shaped built-in permanent magnet structure, and the function of improving the average torque output of the motor by arranging the I-shaped surface inserted permanent magnet structure, thereby improving the running stability and control accuracy of the motor, and the motor can achieve higher average torque and significantly reduce torque pulsation while maintaining a compact size, which not only improves the energy efficiency ratio and response speed of the motor, but also enhances the application potential of the motor in high-performance and high-efficiency applications.

[0016] 2. The purpose of forming a magnetic field concentration by combining the magnetizing direction of the rectangular permanent magnet with the magnetizing direction of the Halbach array permanent magnet is to concentrate the magnetic field in the air gap, thereby achieving the following effects: reducing flux loss. By focusing the magnetic field, the magnetic flux can be more effectively concentrated in the air gap, thereby reducing flux loss in other areas; improving the output torque and power density of the motor. By focusing the magnetic field, the air gap magnetic density can be effectively increased, thereby improving the output torque and power density of the motor; improving the magnetic flux utilization rate and output performance of the motor. By concentrating the magnetic field, the utilization efficiency of the magnetic flux in the air gap can be enhanced, thereby improving the output performance of the motor; improving the weak magnetic speed expansion capability of the motor. By concentrating the magnetic field in the air gap, it is helpful to improve the speed expansion capability of the motor under low magnetic field conditions; the purpose of forming a magnetic field concentration in the present invention is to optimize the performance of the motor. By concentrating the magnetic field in the air gap, it is possible to reduce flux loss, improve the motor torque and power density, improve the motor flux utilization rate and output performance, and enhance the weak magnetic speed expansion capability of the motor.

[0017] 3. The present invention optimizes the magnetic field distribution and the magnetic flux path through hybrid poles, thereby achieving the effect of reducing torque pulsation and improving average torque, thereby improving the output performance of the motor. The proposed hybrid pole permanent magnet rotor structure adopts a combination of a V-shaped built-in permanent magnet structure and a straight-line surface inserted permanent magnet structure, which effectively realizes the function of reducing torque pulsation and improving average torque through a hybrid pole permanent magnet rotor structure, thereby improving the output performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a high air gap magnetic density mixed pole permanent magnet motor rotor of the present invention; Figure 2 The magnetization direction diagram of the permanent magnet of the hybrid-pole permanent magnet motor rotor of the present invention; Figure 3 It is a principle diagram of the optimal magnetization angle of a rectangular permanent magnet in the V-shaped built-in permanent magnet structure of the present invention; Figure 4 It is a principle diagram of the optimal magnetization angle of the Halbach array permanent magnet in the straight-line surface-inserted permanent magnet structure of the present invention; Figure 5 It is the torque output diagram of the present invention at different magnetizing angles under the same current; Figure 6 This is a schematic diagram of the principle of improving the average torque of a motor by using a straight-line surface-inserted permanent magnet structure of the present invention; Figure 7 Providing a torque separation diagram for the rectangular permanent magnet in the V-shaped built-in permanent magnet structure and the Halbach array permanent magnet in the I-shaped surface insertion permanent magnet structure of the present invention; Figure 8This is a schematic diagram of the principle of suppressing motor torque pulsation by the rectangular permanent magnet in the V-shaped built-in permanent magnet structure of the present invention.

[0019] In the figure: 1. rotor core; 2. rectangular permanent magnet; 3. Halbach array permanent magnet; 4. V-shaped groove; 5. I-shaped groove; 6. first small permanent magnet; 7. second small permanent magnet; 8. large permanent magnet; 9. first magnetic isolation bridge; 10. second magnetic isolation bridge; 11. first magnetic isolation groove; 12. second magnetic isolation groove. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] like Figure 1 As shown, a high air gap magnetic density mixed pole permanent magnet motor rotor comprises a rotor core 1, a rectangular permanent magnet 2 and a Halbach array permanent magnet 3, characterized in that: the outer surface of the rotor core 1 is evenly distributed with V-shaped grooves 4 and I-shaped grooves 5; the rectangular permanent magnet 2 is arranged inside the V-shaped groove 4 to form a V-shaped built-in permanent magnet structure, and the V-shaped built-in permanent magnet structure is used to suppress torque pulsation during motor operation; the Halbach array permanent magnet 3 is embedded in the I-shaped groove 5 on the surface of the rotor core 1 to form an I-shaped surface inserted permanent magnet structure, and the I-shaped surface inserted permanent magnet structure is used to improve the average torque output of the motor; the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure The magnetizing direction of the rectangular permanent magnet 2 is combined with the magnetizing direction of the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure to form a magnetic field concentration, and the magnetic field concentration is used to improve the output torque quality of the motor; the center line of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure is aligned with the magnetic pole center line of the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure, and the V-shaped grooves 4 and I-shaped grooves 5 are evenly distributed on the outer surface of the rotor core 1, and the rectangular permanent magnet 2 is arranged inside the V-shaped groove 4 to form a V-shaped built-in permanent magnet structure, and then the Halbach array permanent magnet 3 is embedded in the I-shaped groove 5 on the surface of the rotor core 1 to form a I-shaped surface inserted permanent magnet structure.

[0022] Specifically, the V-shaped groove 4 is respectively provided with a first magnetic isolation bridge 9 and a second magnetic isolation bridge 10 on the inner side close to the center of the rotor and the outer side away from the center of the rotor. The widths of the first magnetic isolation bridge 9 and the second magnetic isolation bridge 10 are 2mm and 1.5mm-2mm respectively. The first magnetic isolation bridge 9 and the second magnetic isolation bridge 10 are provided to effectively improve the magnetic flux density waveform of the air gap, thereby reducing the torque fluctuation of the motor.

[0023] like Figure 2As shown, the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure and the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure are both provided with a semicircular first magnetic isolation groove 11 with a radius of 0.5 mm at both ends close to the inner side of the rotor center; the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure is provided with a semicircular second magnetic isolation groove 12 with a radius of 1 mm at one end of the center line close to the inner side of the rotor center, and the number of the first magnetic isolation groove 11 and the second magnetic isolation groove 12 are both multiple, and the first magnetic isolation groove 11, the second magnetic isolation groove 12, the V-shaped groove 4 and the I-shaped groove 5 are all interconnected to form a magnetic barrier, and the magnetic barrier can be provided to reduce the mass of the silicon steel sheet of the rotor core 1, thereby improving the mechanical strength of the rotor under high-speed operation.

[0024] Specifically, the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure is located in the middle position of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure; the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure is composed of a first small permanent magnet 6, a second small permanent magnet 7 and a large permanent magnet 8, and the first small permanent magnet 6 and the second small permanent magnet 7 are respectively distributed on both sides of the large permanent magnet 8; the first small permanent magnet 6 and the second small permanent magnet 7 have the same structure and size, and the first small permanent magnet 6, the second small permanent magnet 7 and the large permanent magnet 8 all adopt a fan-shaped structure, the width ratio of the first small permanent magnet 6 and the second small permanent magnet 7 to the large permanent magnet 8 is 1:7.93, and the thickness of the first small permanent magnet 6, the second small permanent magnet 7 and the large permanent magnet 8 is 3mm-4mm; the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure is magnetized along the width direction, and the magnetization direction of the Halbach array permanent magnet 3 in the I-shaped surface insertion permanent magnet structure is determined by the first small permanent magnet 6, the second small permanent magnet 7 and the large permanent magnet 8; the large permanent magnet 8 is magnetized along the radial direction, and the first small permanent magnet The body 6 is magnetized along the bottom 53° direction, and the second small permanent magnet 7 is magnetized along the bottom 143° direction; the magnetic field is formed by combining the magnetization direction of the rectangular permanent magnet 2 with the magnetization direction of the Halbach array permanent magnet 3. The purpose of magnetic concentration is to concentrate the magnetic field in the air gap, thereby achieving the following effects: (1) reducing flux loss. By focusing the magnetic field, the magnetic flux can be more effectively concentrated in the air gap, thereby reducing flux loss in other areas; (2) improving the output torque and power density of the motor. By focusing the magnetic field, the air gap magnetic density can be effectively increased, thereby improving the output torque of the motor. and power density; (3) improving the motor magnetic flux utilization and output performance. By concentrating the magnetic field, the utilization efficiency of the magnetic flux in the air gap can be enhanced, thereby improving the output performance of the motor; (4) improving the weak magnetic speed expansion capability of the motor. By concentrating the magnetic field in the air gap, it helps to improve the speed expansion capability of the motor under low magnetic field conditions; the purpose of forming a magnetic field concentration in the present invention is to optimize the performance of the motor. By concentrating the magnetic field in the air gap, it is possible to reduce the magnetic flux loss, increase the motor torque and power density, improve the motor magnetic flux utilization and output performance, and enhance the motor weak magnetic speed expansion capability.

[0025] The optimal magnetization angle of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure of the present invention and the optimal magnetization angle of the Halbach array permanent magnet 3 in the straight-line surface insertion permanent magnet structure are given by Figure 3 and Figure 4 Income.

[0026] like Figure 3 As shown, it is a schematic diagram of the optimal magnetization angle of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure; Figure 3It can be seen that the magnetizing direction of the Halbach array permanent magnet 3 in the I-shaped surface-inserted permanent magnet structure remains unchanged; the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure is magnetized in the width direction as the initial position and in the length direction as the final position, and the magnetizing angle range is 90°; with the increase of the magnetizing angle, the average torque output by the motor shows a gradually decreasing trend, and the corresponding torque pulsation does not change with the change of the magnetizing angle; when the magnetizing angle is 0°, it is magnetized along the width direction, which is the optimal magnetizing angle of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure.

[0027] like Figure 4 As shown, it is a schematic diagram of the optimal magnetization angle of the Halbach array permanent magnet 3 in the straight-line surface insertion permanent magnet structure. Figure 4 It can be seen that the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure is magnetized along the width direction, and the magnetization angle remains unchanged; the large permanent magnet 8 in the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure is magnetized along the radial direction; the first small permanent magnet 6 has an original magnetization angle at one side close to the inner side of the rotor center, and a final magnetization angle at a counterclockwise direction of 90°; the second small permanent magnet 7 has an original magnetization angle at one side close to the inner side of the rotor center, and a final magnetization angle at a clockwise direction of 90°; and as the magnetization angle increases, the average torque output by the motor shows a trend of first increasing and then decreasing, and the corresponding torque pulsation shows a trend of first decreasing and then stabilizing as the magnetization angle increases; when the first small permanent magnet 6 is magnetized along the bottom 53° direction, the second small permanent magnet 7 is magnetized along the bottom 143° direction, and the large permanent magnet 8 is magnetized along the radial direction, this is the optimal magnetization angle of the Halbach array permanent magnet 3 in the I-shaped surface inserted permanent magnet structure.

[0028] like Figure 5 As shown in FIG. 1 , it is a comparison diagram of the output torque of the hybrid-pole permanent magnet motor rotor at the optimal magnetizing angle and the initial magnetizing angle. Figure 5 It can be seen that the output torque of the hybrid-pole permanent magnet motor rotor at the optimal magnetizing angle of the permanent magnet of the present invention is greatly improved compared with the output torque of the initial permanent magnet magnetizing angle, and the average output torque is increased from 312.39 N·m to 329.94 N·m.

[0029] Specifically, the magnetization directions of the rectangular permanent magnets 2 in the two adjacent V-shaped built-in permanent magnet structures and the Halbach array permanent magnets 3 in the I-shaped surface-inserted permanent magnet structure are opposite, and the number of poles of the rectangular permanent magnets 2 in the V-shaped built-in permanent magnet structure is the same as the number of poles of the Halbach array permanent magnets 3 in the I-shaped surface-inserted permanent magnet structure.

[0030] like Figure 6As shown in the figure, it is a principle diagram of improving the average torque of the motor by using a straight-line surface-inserted permanent magnet. In order to reflect the contribution of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure and the Halbach array permanent magnet 3 in the straight-line surface-inserted permanent magnet structure to the air gap flux density, the open-circuit air gap flux density components provided by the two parts are separated by the frozen permeability method; Figure 6 It can be seen that the air gap flux density of the hybrid pole permanent magnet motor of the present invention is mainly provided by the Halbach array permanent magnet 3 in the straight-line surface-inserted permanent magnet structure. It can be inferred that the output torque of the motor is mainly provided by the Halbach array permanent magnet 3 in the straight-line surface-inserted permanent magnet structure.

[0031] like Figure 7 As shown, the torque diagram provided by the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure and the Halbach array permanent magnet in the straight-line surface inserted permanent magnet structure is Figure 7 It can be seen that the output torque of the hybrid-pole permanent magnet motor of the present invention is mainly provided by the Halbach array permanent magnet 3 in the straight-line surface-inserted permanent magnet structure, which verifies Figure 6 conclusion.

[0032] Figure 8 As shown, it is a schematic diagram of the principle of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure to suppress the motor torque pulsation. The frozen permeability method is used to separate the cogging torque of the hybrid pole permanent magnet motor provided in this embodiment; Figure 8 It can be seen that the cogging torque of the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure is opposite to the cogging torque of the Halbach array permanent magnet 3 in the I-shaped surface-inserted permanent magnet structure, and the total cogging torque can be reduced after the two are superimposed; this means that the rectangular permanent magnet 2 in the V-shaped built-in permanent magnet structure can well suppress the cogging torque of the hybrid-pole permanent magnet motor of the present invention, thereby suppressing the torque pulsation of the motor.

[0033] In summary, first, V-shaped grooves 4 and I-shaped grooves are evenly distributed on the outer surface of the rotor core 1, and then the rectangular permanent magnets 2 are arranged inside the V-shaped grooves 4 to form a V-shaped built-in permanent magnet structure, and then the Halbach array permanent magnets 3 are embedded in the I-shaped grooves 5 on the surface of the rotor core 1 to form an I-shaped surface inserted permanent magnet structure. The present invention effectively realizes that the V-shaped built-in permanent magnet structure can suppress the torque pulsation during the operation of the motor, and the I-shaped surface inserted permanent magnet structure can improve the average torque output of the motor, thereby improving the running stability and control accuracy of the motor, and the motor can achieve a higher average torque and significantly reduce torque pulsation while maintaining a compact size, which not only improves the energy efficiency ratio and response speed of the motor, but also enhances the motor in high-performance and high-efficiency applications. Application potential; The present invention combines the magnetizing direction of the rectangular permanent magnet 2 with the magnetizing direction of the Halbach array permanent magnet 3 to form a magnetic field concentration in order to concentrate the magnetic field in the air gap, thereby reducing the flux loss, improving the motor torque and power density, improving the motor flux utilization rate, improving the motor output performance and enhancing the motor weak magnetic speed expansion capability; The present invention optimizes the magnetic field distribution and the flux path through mixed poles, thereby reducing the torque pulsation and increasing the average torque, thereby improving the output performance of the motor, and the proposed mixed pole permanent magnet rotor structure adopts a combination of a V-shaped built-in permanent magnet structure and a straight-line surface inserted permanent magnet structure, which effectively realizes the function of reducing the torque pulsation and increasing the average torque effect through the mixed pole permanent magnet rotor structure of the present invention, thereby improving the output performance of the motor.

[0034] The electronic components used in the present invention are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high air gap magnetic flux density mixed pole permanent magnet motor rotor, comprising a rotor core (1), a rectangular permanent magnet (2) and a Halbach array permanent magnet (3), characterized in that: The outer surface of the rotor core (1) is evenly distributed with V-shaped grooves (4) and straight grooves (5); The rectangular permanent magnet (2) is arranged inside the V-shaped groove (4) to form a V-shaped built-in permanent magnet structure, and the V-shaped built-in permanent magnet structure is used to suppress torque pulsation when the motor is running; The Halbach array permanent magnet (3) is embedded in a straight groove (5) on the surface of the rotor core (1) to form a straight surface inserted permanent magnet structure, and the straight surface inserted permanent magnet structure is used to increase the average torque output of the motor; The magnetizing direction of the rectangular permanent magnet (2) in the V-shaped built-in permanent magnet structure and the magnetizing direction of the Halbach array permanent magnet (3) in the I-shaped surface inserted permanent magnet structure are combined to form a magnetic field concentration, and the magnetic field concentration is used to improve the output torque quality of the motor; The center line of the rectangular permanent magnet (2) in the V-shaped built-in permanent magnet structure is aligned with the magnetic pole center line of the Halbach array permanent magnet (3) in the I-shaped surface-inserted permanent magnet structure.

2. A high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 1, characterized in that: The V-shaped groove (4) is provided with a first magnetic isolation bridge (9) and a second magnetic isolation bridge (10) on the inner side close to the rotor center and the outer side away from the rotor center, respectively. The widths of the first magnetic isolation bridge (9) and the second magnetic isolation bridge (10) are 2 mm and 1.5 mm-2 mm, respectively.

3. The high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 1, characterized in that: The rectangular permanent magnet (2) in the V-shaped built-in permanent magnet structure and the Halbach array permanent magnet (3) in the I-shaped surface-inserted permanent magnet structure are both provided with semicircular first magnetic isolation grooves (11) with a radius of 0.5 mm at both ends close to the inner side of the rotor center.

4. A high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 3, characterized in that: A semicircular second magnetic isolation groove (12) with a radius of 1 mm is provided at one end of the center line of the Halbach array permanent magnet (3) in the I-shaped surface-inserted permanent magnet structure, close to the inner side of the rotor center.

5. A high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 4, characterized in that: The first magnetic isolation grooves (11) and the second magnetic isolation grooves (12) are both multiple in number, and the first magnetic isolation grooves (11), the second magnetic isolation grooves (12), the V-shaped grooves (4) and the straight grooves (5) are all interconnected to form a magnetic barrier.

6. The high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 1, characterized in that: The Halbach array permanent magnet (3) in the I-shaped surface-inserted permanent magnet structure is located in the middle of the rectangular permanent magnet (2) in the V-shaped built-in permanent magnet structure.

7. The high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 1, characterized in that: The Halbach array permanent magnet (3) in the I-shaped surface-inserted permanent magnet structure is composed of a first small permanent magnet (6), a second small permanent magnet (7) and a large permanent magnet (8), wherein the first small permanent magnet (6) and the second small permanent magnet (7) are respectively distributed on both sides of the large permanent magnet (8).

8. The high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 7, characterized in that: The first small permanent magnet (6) and the second small permanent magnet (7) have the same structure and size; the first small permanent magnet (6), the second small permanent magnet (7) and the large permanent magnet (8) all adopt a fan-shaped structure; the width ratio of the first small permanent magnet (6) and the second small permanent magnet (7) to the large permanent magnet (8) is 1:7.93; the thickness of the first small permanent magnet (6), the second small permanent magnet (7) and the large permanent magnet (8) is 3 mm to 4 mm.

9. A high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 8, characterized in that: The rectangular permanent magnet (2) in the V-shaped built-in permanent magnet structure is magnetized along the width direction, and the magnetization direction of the Halbach array permanent magnet (3) in the I-shaped surface-inserted permanent magnet structure is determined by the first small permanent magnet (6), the second small permanent magnet (7) and the large permanent magnet (8); The large permanent magnet (8) is magnetized in a radial direction, the first small permanent magnet (6) is magnetized in a 53° direction at the bottom, and the second small permanent magnet (7) is magnetized in a 143° direction at the bottom.

10. The high air gap magnetic flux density mixed pole permanent magnet motor rotor according to claim 1, characterized in that: The magnetization directions of the rectangular permanent magnets (2) in two adjacent V-shaped built-in permanent magnet structures and the Halbach array permanent magnets (3) in the I-shaped surface-inserted permanent magnet structure are opposite, and the number of poles of the rectangular permanent magnets (2) in the V-shaped built-in permanent magnet structure is the same as the number of poles of the Halbach array permanent magnets (3) in the I-shaped surface-inserted permanent magnet structure.

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