A dual-three-phase asymmetric alternating-pole permanent magnet assisted synchronous reluctance motor

Abstract

The present invention discloses a dual-three-phase asymmetric alternating-pole permanent magnet assisted synchronous reluctance motor. The motor includes a stator 1 and a rotor 2; a dual-three-phase winding 3 structure is adopted on the stator; the permanent magnets on the rotor adopt an alternating-pole asymmetric structure, the magnetization directions of the permanent magnets 71, 73 and 74 are radial and away from the center of the circle, and the magnetization direction of the permanent magnet 72 is perpendicular to the left magnetic barrier 61 of the third layer and points to the left magnetic barrier 51 of the second layer. The first-layer U-shaped magnetic barrier 4 is a symmetric structure; the second-layer U-shaped asymmetric magnetic barrier is composed of a left magnetic barrier 51 and a right magnetic barrier 52, and a permanent magnet 74 is embedded in the middle; the third-layer "one + U" shaped asymmetric magnetic barrier is composed of a left magnetic barrier 61, a right magnetic barrier 62 and an additional one-shaped magnetic barrier 63, and three sections of permanent magnets 71, 72 and 73 are embedded in this magnetic barrier. The motor of the present invention realizes the maximum of both the permanent magnet torque and the reluctance torque at the same current angle, not only improves the utilization rate of the permanent magnet torque and the reluctance torque, increases the output torque, but also reduces the amount of permanent magnets used.

Description

Technical Field

[0001] The present invention relates to a dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor, belonging to the field of motor design and manufacturing. Background Art

[0002] Permanent magnet synchronous motors have the advantages of simple structure, high efficiency, high power factor, and high torque density. Synchronous reluctance motors generally adopt a multi-layer magnetic barrier rotor with a salient pole structure. This structure can increase the magnetic reluctance of the rotor direct and quadrature magnetic circuits, thereby increasing the saliency ratio, improving the motor torque, and avoiding the use of rare earth materials, reducing the cost. Foreign scholars combined the two motor structures and proposed a high-performance new type of motor with great development prospects - the permanent magnet assisted synchronous reluctance motor. The rotor structure of this motor is variable, and the permanent magnet addition method is flexible and diverse, comprehensively utilizing the reluctance torque and permanent magnet torque to further improve the output torque. However, the permanent magnet assisted synchronous reluctance motor also has problems such as low permanent magnet utilization rate, complex structure, and low utilization rates of permanent magnet torque and reluctance torque. Therefore, in the process of motor design, solving these problems has important research significance. On the other hand, due to the high price of permanent magnets, the manufacturing cost of motors is also high. In recent years, the proposed alternating pole structure can not only greatly reduce the usage amount of permanent magnets, but also obtain output performance similar to or even better than that of the conventional pole structure. Applying the alternating pole to the permanent magnet assisted synchronous reluctance motor can improve the permanent magnet utilization rate, permanent magnet torque utilization rate, and reluctance torque utilization rate, which is of great significance for promoting the use of permanent magnet assisted synchronous reluctance motors and enhancing their competitiveness.

[0003] Scholars at home and abroad have proposed many permanent magnet assisted synchronous reluctance motors with different structures. The literature "Design of a Novel PM-Assisted Synchronous Reluctance Motor Topology Using V-Shape Permanent Magnets for Improvement of Torque Characteristic" (IEEE Transactions on Energy Conversion, doi: 10.1109 / TEC.2021.3109079.) introduces a permanent magnet assisted synchronous reluctance motor with an asymmetric V-shaped permanent magnet rotor structure. Under the same current phase angle, this structure uses the maximum values of reluctance torque and permanent magnet torque to improve the total output torque. The literature "Experimental Assessments of a Triple Redundant Nine-Phase Fault-Tolerant PMA-SynRM Drive" (IEEE Transactions on Industrial Electronics, vol. 66, no. 1, pp. 772-783, Jan. 2019.) introduces a modular permanent magnet assisted synchronous reluctance motor and compares it with an interior permanent magnet synchronous motor and a permanent magnet assisted synchronous reluctance motor. The results show that the new structure not only reduces the amount of permanent magnet used, but also has the advantages of low torque ripple, low eddy current loss and high power factor.

[0004] The purpose of this invention patent is to design a dual three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor, improve the utilization rate of permanent magnets, achieve the maximum values of permanent magnet torque and reluctance torque at the same current phase angle, improve the utilization rates of permanent magnet torque and reluctance torque, and increase the output torque of the motor. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of large amount of rare earth permanent magnet materials used, high cost, low utilization rate of permanent magnets, and insufficient utilization of both permanent magnet torque and reluctance torque in existing permanent magnet assisted synchronous reluctance motors, and to propose a dual three-phase alternating pole permanent magnet assisted synchronous reluctance motor. It realizes the maximum values of permanent magnet torque and reluctance torque at the same current phase angle, increases the output torque of the motor, and improves the utilization rates of permanent magnets, permanent magnet torque and reluctance torque.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The present invention proposes a dual-three-phase asymmetric alternating-pole permanent magnet assisted synchronous reluctance motor, including a stator core 1 and a rotor core 2. The stator core 1 is provided with a dual-three-phase winding 3, and the rotor core 2 is provided with three layers of magnetic barriers. The three layers of magnetic barriers are, from the outside to the inside of the rotor, the first layer of U-shaped symmetric magnetic barrier 4, the second layer of U-shaped asymmetric magnetic barrier composed of a left magnetic barrier 51 and a right magnetic barrier 52, and the third layer of "one + U" - shaped asymmetric magnetic barrier composed of a left magnetic barrier 61, a right magnetic barrier 62, and an additional one-shaped magnetic barrier 63. In the second layer of U-shaped asymmetric and the third layer of "one + U" - shaped asymmetric magnetic barriers, an asymmetric alternating-pole array permanent magnet is embedded. The alternating-pole array permanent magnet is composed of permanent magnets 71, 72, 73, and 74 in the second and third layers of magnetic barriers. The angle spanned by the permanent magnet 71 along the circumference is δ, and the magnetization direction is radial magnetization. The length of the permanent magnet 72 is L PM2 , and the magnetization direction is from the third layer of left magnetic barrier 61 perpendicular to the second layer of left magnetic barrier 51 for magnetization. The lengths of the permanent magnets 73 and 74 are respectively L PM3 and L PM4 , and L PM3 >L PM4 . The magnetization directions are both radially away from the center of the circle for magnetization. The permanent magnet 71 is embedded in the third layer of additional one-shaped magnetic barrier 63, and the angle to the left end of the third layer of additional one-shaped magnetic barrier 63 is θ - 1 - δ. The permanent magnet 72 is embedded in the third layer of left magnetic barrier 61, and the distance to the top of the third layer is L3 = 2L1 / 3. The permanent magnets 73 and 74 are respectively embedded in the central positions at the bottoms of the second layer of U-shaped asymmetric and the third layer of "one + U" - shaped asymmetric magnetic barriers. The iron core between two adjacent permanent magnetic poles serves as a virtual pole 8, and the permanent magnetic poles and the virtual pole 8 are alternately distributed on the circumference of the rotor, forming an alternating-pole structure. In the motor rotor 2 of the present invention, an asymmetric magnetic barrier and permanent magnet structure are adopted, and the magnetic barrier opening angles on the left and right sides are not equal. The second layer of left magnetic barrier 51 and the second layer of right magnetic barrier 52, and the third layer of left magnetic barrier 61 and the third layer of right magnetic barrier 62 are all asymmetric structures on the left and right sides. The asymmetric offset angle between the second layer of right magnetic barrier 52 and the third layer of right magnetic barrier 62 is β, the opening angle of the first layer of magnetic barrier 4 is α, the opening angle of the second layer of left magnetic barrier 51 is m, the opening angle of the second layer of right magnetic barrier 52 is m - β, the opening angle of the third layer of left magnetic barrier 61 is n, the opening angle of the third layer of right magnetic barrier 62 is n - β, and the opening angle of the third layer of additional one-shaped magnetic barrier 63 is θ. The length L PM2 of the permanent magnet 72 is less than the length of the third layer of left magnetic barrier 61, the length L PM3 of the permanent magnet 73 is less than the magnetic barrier length L Z3 at the top of the third layer, and the length L PM4 of the permanent magnet 74 is less than the magnetic barrier length L Z2The thicknesses of the permanent magnets 71, 72, 73, and 74 are H PM1 , H PM2 , H PM3 and H PM4 , and H PM2 =H PM3 =H PM4 . The lengths of the virtual poles 8 are L I1 , L I2 , and L I1 >L I2 . The distance between the first-layer U-shaped symmetric magnetic barrier 4 and the second-layer U-shaped asymmetric magnetic barrier is L1, and the distance between the second and third-layer "+U"-shaped asymmetric magnetic barriers is L2, and L1 < L2. R ripm and R ropm are the inner radius and outer radius of the permanent magnet 71 respectively, where H PM1 =R ropm -R ripm .

[0007] A further feature of the present invention is that the magnetic barrier satisfies the following relationships: 4° ≤ α ≤ 5.5°, 11° ≤ m ≤ 12°, 18° ≤ n ≤ 19°, 0 < β ≤ 2°, 7° ≤ θ ≤ 9°, and the included angle θ of the third-layer additional straight-shaped magnetic barrier 63 and the length δ of the permanent magnet 71 satisfy θ = 4δ.

[0008] A further feature of the present invention is that the permanent magnet satisfies the following conditions: 0.5° ≤ δ ≤ 2°, 4 mm ≤ L PM2 ≤ 5 mm, 2.5 mm ≤ L PM4 <L PM3 <L I2 <L I1 ≤ 7 mm, 2 mm ≤ H PM1 ≤ 4 mm, 2 mm ≤ H PM2 =H PM3 =H PM4 ≤ 3 mm, 4 mm ≤ L1 < L2 ≤ 6 mm.

[0009] A further feature of the present invention is that the permanent magnets 71, 72, 73, 74, and the virtual poles 8 are combined into a pair of alternating magnetic poles. The magnetization directions of the permanent magnets 71, 73, and 74 are all radially magnetized away from the center of the circle, and the magnetization direction of the permanent magnet 72 is magnetized perpendicular to the left magnetic barrier 61 of the third layer and pointing to the left magnetic barrier 51 of the second layer.

[0010] The further features of the present invention are as follows: The dual three-phase winding divides the winding into six phases based on the slot electromotive force star diagram, ensuring that the phase difference between phase A1 and phase B1 is 120°, phase A2 is phase-shifted by 30° based on phase A1, the phase difference between phase B1 and phase C1 is 120°, phase B2 is phase-shifted by 30° based on phase B1, the phase difference between phase C1 and phase A1 is 120°, and phase C2 is phase-shifted by 30° based on phase C1.

[0011] The further features of the present invention are as follows: The dual three-phase winding for a permanent magnet assisted synchronous reluctance motor can effectively reduce torque ripple and improve torque density.

[0012] The further features of the present invention are as follows: This structure is applicable not only to dual three-phase motors but also to three-phase motors.

[0013] The further features of the present invention are as follows: In the three-layer magnetic barrier, the inner two layers are partially embedded with permanent magnets, and the remaining parts are air gaps or non-magnetic materials.

[0014] The present invention has the following beneficial effects:

[0015] 1. The permanent magnet motor of the present invention adopts an alternating pole and asymmetric pole structure. Compared with a conventional permanent magnet motor with a symmetric N-S array, it improves the utilization rate of permanent magnets, the utilization rate of permanent magnet torque, and the utilization rate of reluctance torque. This structure not only achieves the simultaneous maximum values of permanent magnet torque and reluctance torque at the same current phase angle, improving the total output torque of the motor, but also reduces the amount of permanent magnets used.

[0016] 2. The asymmetric magnetic barrier, asymmetric permanent magnet array, and "one + U" shaped permanent magnet array of the present invention achieve the offset of the d-axis of the rotor magnetic field, enabling both the permanent magnet torque and the reluctance torque to reach their maximum values at the same current angle, thereby increasing the torque output capacity of the motor.

[0017] 3. Each permanent magnet pole of the present invention is composed of four permanent magnets, and the four permanent magnets form a magnetic concentration, which is beneficial to improving the torque performance.

[0018] 4. The present invention adopts a dual three-phase winding. When phase-shifted by a certain angle, the even harmonics in the inductance are eliminated, thereby eliminating the even harmonics in the reluctance torque and increasing the fundamental wave content of the reluctance torque, achieving the purpose of improving the reluctance torque and reducing torque ripple.

[0019] 5. When a fault occurs in the motor winding or the driver, the dual three-phase structure enables the motor to continue to operate smoothly.

[0020] 6. When the present invention adopts an alternating pole structure, the magnetic reluctance of the q-axis magnetic circuit increases, resulting in an increase in the difference between the d-axis and q-axis inductances, and further increasing the reluctance torque, thereby increasing the proportion of the reluctance torque in the total output torque. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the motor according to an embodiment of the present invention.

[0022] Figure 2 It is a partially enlarged view of the motor according to an embodiment of the present invention.

[0023] Figure 3 It is a partially enlarged view of the rotor of the motor according to an embodiment of the present invention.

[0024] Figure 4 It is a slot electromotive force star diagram of the motor according to an embodiment of the present invention.

[0025] Figure 5 It is a torque-angle characteristic diagram of the motor according to an embodiment of the present invention.

[0026] Figure 6 It is a torque-angle characteristic diagram of a conventional motor.

[0027] Figure 7 It is an electromagnetic torque waveform diagram.

[0028] Figure 1 Names of reference numerals: 1. Stator; 2. Rotor core; 3. Double three-phase winding; 4. First-layer U-shaped symmetric magnetic barrier; 51. Second-layer left magnetic barrier; 52. Second-layer right magnetic barrier; 61. Third-layer left magnetic barrier; 62. Third-layer right magnetic barrier; 63. Third-layer additional one-shaped magnetic barrier; 71. Permanent magnet; 72. Permanent magnet; 73. Permanent magnet; 74. Permanent magnet; 8. Virtual pole. Specific embodiments

[0029] The following will describe in detail the specific implementation of the present invention in conjunction with the drawings, in order to more clearly and completely illustrate the structural characteristics and beneficial effects of the motor of the present invention.

[0030] The following will describe the present invention in conjunction with the double three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor in the drawings. As Figure 1 shown, the permanent magnets are embedded inside the second-layer U-shaped asymmetric magnetic barrier and the third-layer "one + U" shaped asymmetric magnetic barrier, and the magnetization direction of the permanent magnets is as Figure 2 shown. In the embodiment of the present invention, the number of pole pairs p of the motor is 7. The number of stator slots is 48. According to the theory of the slot electromotive force star diagram in electrical machinery, the armature winding of the embodiment of the present invention adopts a distributed double-layer winding to obtain the maximum output torque.

[0031] Figure 1 , Figure 2 and Figure 3 are respectively the embodiment diagram of the double three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor of the present invention, the partially enlarged view of the embodiment motor, and the partially enlarged view of the rotor of the embodiment motor. Figure 1It includes a stator core 1 and a rotor core 2. The stator core 1 is provided with a double three-phase winding 3, and there are three layers of magnetic barriers in the rotor core 2. From the outside to the inside of the rotor, the three layers of magnetic barriers are the first-layer U-shaped symmetric magnetic barrier 4, the second-layer U-shaped asymmetric magnetic barrier composed of a left magnetic barrier 51 and a right magnetic barrier 52, and the third-layer "one + U" - shaped asymmetric magnetic barrier composed of a left magnetic barrier 61, a right magnetic barrier 62, and an additional one-shaped magnetic barrier 63. In the second-layer U-shaped asymmetric and third-layer "one + U" - shaped symmetric magnetic barriers, there are embedded asymmetric alternating pole array permanent magnets. The alternating pole array permanent magnets are composed of permanent magnets 71, 72, 73, and 74 in the second-layer U-shaped asymmetric and third-layer "one + U" - shaped asymmetric magnetic barriers. As Figure 2 shown, in the second-layer U-shaped asymmetric magnetic barrier and the third-layer "one + U" - shaped asymmetric magnetic barrier, there are rare-earth permanent magnets 71, 72, 73, and 74. The angle spanned by the permanent magnet 71 along the circumference is δ, and the magnetization direction is radial magnetization. The length of the permanent magnet 72 is L PM2 , and the magnetization direction is perpendicular to the third-layer left magnetic barrier 61 and points to the second-layer left magnetic barrier 51 for magnetization. The lengths of the permanent magnets 73 and 74 are L PM3 and L PM4 , and L PM3 >L PM4 . The magnetization directions are both radially away from the center of the circle for magnetization. The permanent magnet 71 is embedded in the third-layer additional one-shaped magnetic barrier 63, and the angle to the left end of the third-layer additional one-shaped magnetic barrier 63 is θ - 1 - δ. The permanent magnet 72 is embedded in the third-layer left magnetic barrier 61, and the distance to the top of the third layer is L3 = 2L1 / 3. The permanent magnets 73 and 74 are respectively embedded in the central positions at the bottoms of the second-layer and third-layer magnetic barriers. The iron core between two adjacent permanent magnetic poles acts as a virtual pole 8, and the permanent magnetic poles and the virtual pole 8 are evenly distributed on the circumference of the rotor, forming an alternating pole structure. The stator core 1 and the rotor core 2 are both laminated from silicon steel sheets with high magnetic permeability. The gap between the stator and the rotor is 0.5 mm. Two sets of three-phase windings are wound in the stator 1, and both adopt the distributed winding method. As Figure 3 shown, the rotor 2 adopts an asymmetric magnetic barrier and permanent magnet structure. The second-layer left magnetic barrier 51 and the second-layer right magnetic barrier 52, the third-layer left magnetic barrier 61 and the third-layer right magnetic barrier 62 are all asymmetric structures on the left and right sides. The asymmetric offset angle between the second-layer right magnetic barrier 52 and the third-layer right magnetic barrier 62 is β, the opening angle of the first-layer magnetic barrier 4 is α, the opening angle of the second-layer left magnetic barrier 51 is m, the opening angle of the second-layer right magnetic barrier 52 is m - β, the opening angle of the third-layer left magnetic barrier 61 is n, the opening angle of the third-layer right magnetic barrier 62 is n - β, and the opening angle of the third-layer additional one-shaped magnetic barrier 63 is θ. In addition, the length L of the permanent magnet 72 PM2Less than the length of the left magnetic barrier 61 of the third layer, the length L of the permanent magnet 73 PM3 Less than the length L of the magnetic barrier at the top of the third layer Z3 , the length L of the permanent magnet 74 PM4 Less than the length L of the magnetic barrier at the top of the second layer Z2 . The thicknesses of the permanent magnet 71, the permanent magnet 72, the permanent magnet 73, and the permanent magnet 74 are H respectively PM1 、H PM2 、H PM3 and H PM4 , and H PM2 =H PM3 =H PM4 . The lengths of the virtual pole 8 are L respectively I1 、L I2 , and L I1 >L I2 . The distance between the first-layer U-shaped symmetric magnetic barrier 4 and the second-layer U-shaped asymmetric magnetic barrier is L1, the distance between the second-layer U-shaped asymmetric magnetic barrier and the third-layer "one + U" -shaped asymmetric magnetic barrier is L2, and L1 < L2. R ripm and R ropm are the inner radius and the outer radius of the permanent magnet 71 respectively, where H PM1 =R ropm -R ripm ; The magnetic barriers satisfy the following relationships: 4° ≤ α ≤ 5.5°, 11° ≤ m ≤ 12°, 18° ≤ n ≤ 19°, 0 < β ≤ 2°, 7 ≤ θ ≤ 9°, the included angle θ of the third-layer additional one-shaped magnetic barrier 63 and the length δ of the permanent magnet 71 satisfy θ = 4δ; The permanent magnets satisfy the following conditions: 0.5° ≤ δ ≤ 2°, 4mm ≤ L PM2 ≤ 5mm, 2.5mm ≤ L PM4 <L PM3 <L I2 <L I1 ≤ 7mm, 2mm ≤ H PM1 ≤ 4mm, 2mm ≤ H PM2 =H PM3 =H PM4 ≤ 3mm, 4mm ≤ L1 < L2 ≤ 6mm.

[0032] Figure 4 is the slot potential star diagram of the motor in the embodiment of the present invention. The double-three-phase winding is composed of two three-phase windings, and there is a phase shift angle between the two windings in space, ensuring that the phase difference between phase A1 and phase B1 is 120°, phase A2 is phase-shifted by 30° based on phase A1, the phase difference between phase B1 and phase C1 is 120°, phase B2 is phase-shifted by 30° based on phase B1, the phase difference between phase C1 and phase A1 is 120°, and phase C2 is phase-shifted by 30° based on phase C1.

[0033] Figure 5 It is the torque-angle characteristic diagram of the motor in the embodiment of the present invention. Figure 6 It is the torque-angle characteristic diagram of the traditional motor. The motor in the embodiment realizes that the permanent magnet torque and the reluctance torque reach the maximum values simultaneously at the same current phase angle, improving the utilization rate of the permanent magnet, the permanent magnet torque and the reluctance torque, and enhancing the output torque. The difference between the maximum value of the permanent magnet torque and the maximum value of the reluctance torque of the traditional motor is 45° current angle, and neither the permanent magnet torque nor the reluctance torque is fully utilized.

[0034] Figure 7 It is the electromagnetic torque waveform diagram. It can be seen from the figure that the torque ripples of both the motor in the embodiment and the traditional motor are relatively low, and the output torque of the motor in the embodiment is much higher than that of the traditional motor, indicating that the motor in the embodiment has greatly improved the output performance of the motor.

[0035] This article uses terms such as "the first-layer U-shaped symmetric magnetic barrier", "the second-layer U-shaped asymmetric magnetic barrier", "the third-layer 'one + U'-shaped asymmetric magnetic barrier", and "embodiment" more frequently. The descriptions of these terms are intended to combine the specific features, structures or characteristics of the motor in the embodiment, aiming to more conveniently describe and explain the present invention.

[0036] In the present invention, the principles and embodiments of the present invention are described through specific examples. Those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor, characterized in that: It includes a stator core 1 and a rotor core 2. The stator core 1 is provided with a double three-phase winding 3, and the rotor core 2 is provided with three layers of magnetic barriers. The three layers of magnetic barriers are, from the outside to the inside of the rotor, the first-layer U-shaped symmetric magnetic barrier 4, the second-layer U-shaped asymmetric magnetic barrier composed of a second-layer left magnetic barrier 51 and a second-layer right magnetic barrier 52, and the third-layer "one + U" - shaped asymmetric magnetic barrier composed of a third-layer left magnetic barrier 61, a third-layer right magnetic barrier 62, and an additional one-shaped magnetic barrier 63; asymmetric alternating pole array permanent magnets are embedded in the second-layer U-shaped asymmetric magnetic barrier and the third-layer "one + U" - shaped asymmetric magnetic barrier. The alternating pole array permanent magnets include a permanent magnet 74 embedded in the second-layer U-shaped asymmetric magnetic barrier, and permanent magnets 71, 72, and 73 embedded in the third-layer "one + U" - shaped asymmetric magnetic barrier in sequence; the angle spanned by the permanent magnet 71 along the circumference is δ, and the magnetization direction is radially away from the center of the circle. The length of the permanent magnet 72 is L PM2 , and the magnetization direction is perpendicular to the third-layer left magnetic barrier 61 and points in the direction of the second-layer left magnetic barrier 51. The lengths of the permanent magnets 73 and 74 are both L PM3 and L PM4 , and L PM3 >L PM4 . The magnetization directions of both are radially away from the center of the circle. The permanent magnet 71 is embedded in the third-layer additional one-shaped magnetic barrier 63, and the angle to the left end of the third-layer additional one-shaped magnetic barrier 63 is θ - 1 - δ. The permanent magnet 72 is embedded in the third-layer left magnetic barrier 61, and the distance to the top of the third layer is L3 = 2L1 / 3. The permanent magnets 73 and 74 are respectively embedded in the central positions at the bottoms of the second-layer and third-layer "one + U" - shaped asymmetric magnetic barriers; the iron core between two adjacent permanent magnetic poles serves as a virtual pole 8, and the permanent magnetic poles and the virtual pole 8 are alternately distributed on the circumference of the rotor, forming an alternating pole structure; The rotor 2 adopts an asymmetric magnetic barrier and permanent magnet structure. The left magnetic barrier 51 and the right magnetic barrier 52 on the second layer, and the left magnetic barrier 61 and the right magnetic barrier 62 on the third layer are all asymmetrical structures on the left and right sides; the asymmetric offset angle between the right magnetic barrier 52 on the second layer and the right magnetic barrier 62 on the third layer is β, the opening angle of the first-layer magnetic barrier 4 is α, the opening angle of the left magnetic barrier 51 on the second layer is m, the opening angle of the right magnetic barrier 52 on the second layer is m - β, the opening angle of the left magnetic barrier 61 on the third layer is n, the opening angle of the right magnetic barrier 62 on the third layer is n - β, the opening angle of the additional one-shaped magnetic barrier 63 on the third layer is θ, the distance between the first-layer U-shaped symmetric magnetic barrier and the second-layer U-shaped asymmetric magnetic barrier is L1, and the distance between the second-layer U-shaped asymmetric magnetic barrier and the third-layer "one + U" - shaped asymmetric magnetic barrier is L2, and L1 < L2; The length L of the permanent magnet 72 PM2 is less than the length of the left magnetic barrier 61 of the third layer. The length L of the permanent magnet 73 PM3 is less than the length L of the magnetic barrier at the top of the third layer Z3 , the length L of the permanent magnet 74 PM4 is less than the length L of the magnetic barrier at the top of the second layer Z2 ; the thicknesses of the permanent magnet 71, the permanent magnet 72, the permanent magnet 73, and the permanent magnet 74 are H PM1 , H PM2 , H PM3 , and H PM4 , and H PM2 =H PM3 =H PM4 . The inner radius and the outer radius of the permanent magnet 71 are R ripm and R ropm , where H PM1 =R ropm -R ripm .

2. The dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor according to claim 1, wherein: The lengths of the virtual poles 8 are L I1 , L I2 , and L I1 > L I2 .

3. The dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance machine according to claim 1, wherein: The three-layer magnetic barriers satisfy the following relationships: 4° ≤ α ≤ 5.5°, 11° ≤ m ≤ 12°, 18° ≤ n ≤ 19°, 0 < β ≤ 2°, 7° ≤ θ ≤ 9°. The opening angle θ of the additional one-shaped magnetic barrier 63 on the third layer and the length δ of the permanent magnet 71 satisfy θ = 4δ.

4. A dual-three-phase asymmetric alternating-pole permanent magnet assisted synchronous reluctance machine according to claim 1, characterized in that: The parameters of the permanent magnets 71, 72, 73 and 74 satisfy the following relationships: 0.5° ≤ δ ≤ 2°, 4mm ≤ L PM2 ≤ 5mm, 2.5mm ≤ L PM4 < L PM3 < L I2 < L I1 ≤ 7mm, 2mm ≤ H PM1 ≤ 4mm, 2mm ≤ H PM2 = H PM3 = H PM4 ≤ 3mm, 4mm ≤ L1 < L2 ≤ 6mm.

5. A dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: The double-three-phase winding 3 adopts a double-layer winding structure with a span of 3. In the slot electromotive force star diagram, the winding is divided into six phases, ensuring that the phase difference between phase A1 and phase B1 is 120°, phase A2 is phase-shifted by 30° based on phase A1, the phase difference between phase B1 and phase C1 is 120°, phase B2 is phase-shifted by 30° based on phase B1, the phase difference between phase C1 and phase A1 is 120°, and phase C2 is phase-shifted by 30° based on phase C1.

6. A dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance machine according to claim 1, characterized in that: The magnetic poles synthesized by the permanent magnets 71, 72, 73, and 74 and the virtual pole 8 form a pair of alternating magnetic poles.

7. A dual-three-phase asymmetric alternating pole permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: In the three-layer magnetic barriers, the inner two layers are partially embedded with permanent magnets, and the rest are air gaps or non-magnetic materials.

8. A dual-three-phase asymmetrical alternating pole permanent magnet assisted synchronous reluctance machine according to claim 1, characterized in that: This motor structure is applicable not only to double-three-phase motors but also to three-phase motors.

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