Stator permanent magnet type magnetic flux switching permanent magnet motor

Abstract

The embodiment of the invention provides a stator permanent magnet type flux switching permanent magnet motor, and belongs to the field of motors. The stator permanent magnet type magnetic flux switching permanent magnet motor comprises a rotor and a stator which are arranged from outside to inside, wherein an air gap is formed between the stator and the rotor; the stator side is provided with a plurality of tooth tip magnetic barriers to guide a permanent magnetic flux part to pass through, thereby effectively reducing the magnetic density of the end part of the permanent magnet and relieving the local saturation of stator teeth. When the armature current introduced into the stator winding is increased, the quadrature-axis magnetic flux generated by the armature winding and the loop magnetic flux of the anti-saturation magnetic flux path intersect at the stator tooth tip and are in a tradeoff relation, and the magnetic field of the stator permanent magnet type magnetic flux switching permanent magnet motor is adjustable on line. By constructing the stator tooth tip magnetic barrier, directionally changing the permanent magnetic flux path and designing the stator tooth tip magnetic flux intersection area, tooth saturation of a traditional magnetic flux switching permanent magnet motor is relieved, the overload capacity of the magnetic flux switching permanent magnet motor is improved, and the speed regulation range of the motor is widened.

Description

Technical Field

[0001] The present invention belongs to the field of motors, and particularly relates to a stator permanent magnet flux-switching permanent magnet motor. Background Art

[0002] The stator permanent magnet flux-switching permanent magnet motor is a new type of permanent magnet synchronous motor. Its permanent magnets are embedded in the stator core and do not directly contact the air outside the stator, and the rotor is of salient pole structure. This stator permanent magnet flux-switching permanent magnet motor inherits the advantages of the brushless doubly salient motor that the rotor has neither permanent magnets nor windings, and has a simple structure and is durable. With advantages such as high torque density, high efficiency, and simple structure, the stator permanent magnet flux-switching permanent magnet motor has a wide range of applications in electric vehicles, servo drives, industrial automation and other fields.

[0003] However, since all the permanent magnets are located on the stator side, the permanent magnetic field generated by the permanent magnets and the armature magnetic field generated by the armature winding are superimposed at the stator teeth, resulting in easy saturation of the stator teeth of this type of motor under large currents, greatly reducing the overload capacity of this type of motor, which is one of the adverse factors affecting the torque output of this type of motor.

[0004] The Chinese patent application publication number CN117650645A (the invention name is: A mechanically adjustable magnetic flux-switching permanent magnet motor) proposes a mechanically adjustable magnetic flux-switching permanent magnet motor. During the operation of the motor, an intermediate stator ring can be rotated by other power-assisted devices to change its relative position with the outer stator, realizing the on-line adjustment of the air-gap magnetic field. However, this motor adjusts the magnetic field by means of a mechanical structure and has poor reliability at high speeds.

[0005] The Chinese invention patent publication number CN115021433B (the invention name is: A stator-split stator permanent magnet axial-radial hybrid magnetic field permanent magnet flux-switching permanent magnet motor) proposes a stator-split stator permanent magnet axial-radial hybrid magnetic field permanent magnet flux-switching permanent magnet motor. This motor adopts a split stator, and the armature winding and the permanent magnets are respectively arranged on the armature stator and the excitation stator, relieving the saturation of the stator tooth magnetic circuit and improving the torque density of the motor and the torque output ability under overload. However, the permanent magnet air-gap magnetic flux of this type of motor needs to pass through a double-layer air gap, and the utilization rate of the permanent magnets decreases significantly compared with the traditional flux-switching permanent magnet motor.

[0006] In summary, how to relieve the saturation of the stator tooth magnetic circuit of the flux-switching permanent magnet motor, realize the adjustable air-gap magnetic flux of this type of motor, and improve the utilization rate of the permanent magnets is one of the urgent problems to be solved for this type of motor. Summary of the Invention

[0007] The object of the present invention is to at least partially solve the above technical problems, aiming to provide a stator permanent magnet flux-switching permanent magnet motor, alleviating the saturation of the stator tooth magnetic circuit of the current flux-switching permanent magnet motor, improving the utilization rate of permanent magnets, enabling the adjustable air-gap flux of this type of motor, and improving the torque output and overload capacity of the motor.

[0008] In some embodiments, the stator permanent magnet flux-switching permanent magnet motor is an anti-saturation adjustable flux stator permanent magnet flux-switching permanent magnet motor.

[0009] In one aspect of the present invention, a stator permanent magnet flux-switching permanent magnet motor is provided, including:

[0010] A stator, the stator includes a plurality of stator teeth, stator tooth tips located at the outer ends of the stator teeth, stator windings arranged on the stator teeth, permanent magnets embedded in the stator teeth, and at least two tooth tip magnetic barriers embedded in the stator tooth tips;

[0011] A rotor, sleeved outside the stator;

[0012] An air gap, located between the stator and the rotor;

[0013] Wherein, the at least two tooth tip magnetic barriers include a first tooth tip magnetic barrier and a second tooth tip magnetic barrier that are embedded with each other and have a gap therebetween.

[0014] In some embodiments, the plurality of stator teeth are arranged at equal intervals along the circumference.

[0015] In some embodiments, the first tooth tip magnetic barrier is embedded outside the stator tooth tip, the second tooth tip magnetic barrier is embedded relative to the first tooth tip magnetic barrier inside the stator tooth tip, the cross-section of the second tooth tip magnetic barrier is in a basin shape, its opening faces the air gap, and both sides of the basin shape form a t i angle, satisfying 60° < t i < 90°.

[0016] In some embodiments, the cross-section of the first tooth tip magnetic barrier is in a trapezoid shape, the long side of the trapezoid is close to the air gap, and the short side of the trapezoid is away from the air gap.

[0017] In some embodiments, the first tooth tip magnetic barrier is arranged at the opening position of the second tooth tip magnetic barrier and has a gap with the second tooth tip magnetic barrier.

[0018] In some embodiments, the number of stator teeth is 3m, where m is a positive integer greater than 0; the rotor teeth are a total of n, arranged at equal intervals along the circumference, where, n = 3km ± 2, k is a positive integer greater than 1; the inner pole arc width of the rotor teeth is α oi , the outer pole arc width of the rotor teeth is α oo , satisfying α oi < αoo 。

[0019] In some embodiments, the pole arc width of the stator teeth is β a , satisfying α oi < β a < π / 3m.

[0020] In some embodiments, the number of the permanent magnets is equal to the number of the stator teeth, being 3m, and the permanent magnets are embedded in the stator teeth, wherein the outer ends of the permanent magnets are flush with the outer ends of the stator teeth, the inner ends of the permanent magnets are located on the same circumference as the inner surface of the stator, and the long sides of the permanent magnets are parallel to the stator teeth; the inner surface of the stator yoke is located on the same circumference as the inner ends of the permanent magnets.

[0021] In some embodiments, when the stator permanent magnet type flux switching permanent magnet motor operates, a main flux path corresponding to one stator tooth is formed, and the flux passes through the air gap into the rotor and then returns to the stator.

[0022] In some embodiments, when the stator permanent magnet type flux switching permanent magnet motor operates, at least two anti-saturation flux paths corresponding to each stator tooth are formed; the permanent magnet loop flux flowing through the anti-saturation flux paths is coupled with the quadrature-axis flux generated after the stator winding is energized at the stator tooth tips.

[0023] In some embodiments, the rotor includes a rotor yoke and rotor teeth, and the flux path of the main flux path is as follows: starting from the permanent magnet, passing through the stator teeth, stator tooth tips, air gap, rotor teeth, rotor yoke, rotor teeth, air gap, stator tooth tips, and stator teeth and then returning to the permanent magnet.

[0024] In some embodiments, the stator permanent magnet type flux switching permanent magnet motor includes two anti-saturation flux paths for each stator tooth, and their flux paths are as follows:

[0025] Anti-saturation flux path one: starting from the permanent magnet, passing through the stator teeth, stator tooth tips, the outer magnetic bridge of the first tooth tip magnetic barrier, the outer magnetic bridge of the first tooth tip magnetic barrier, the outer magnetic bridge of the second tooth tip magnetic barrier, stator tooth tips, and stator teeth and then returning to the permanent magnet.

[0026] Anti-saturation flux path two: starting from the permanent magnet, passing through the stator teeth, stator tooth tips, the outer magnetic bridge of the first tooth tip magnetic barrier, the magnetic bridge between the first tooth tip magnetic barrier and the second tooth tip magnetic barrier, the outer magnetic bridge of the second tooth tip magnetic barrier, stator tooth tips, and stator teeth and then returning to the permanent magnet.

[0027] A multi-armature source composite magnetic circuit trapezoidal domain high-efficiency permanent magnet motor according to an embodiment of the present invention has at least one of the following advantages:

[0028] 1. The stator permanent magnet type flux-switching permanent magnet motor provided by the present invention reduces the magnetic density at the end of the permanent magnet by setting at least two layers of tooth tip magnetic barriers, alleviates the magnetic circuit saturation of the stator teeth of the flux-switching permanent magnet motor, and improves the overload capacity of this type of motor.

[0029] 2. The stator permanent magnet type flux-switching permanent magnet motor provided by the present invention enables the leakage magnetic flux at the end of the permanent magnet and the armature magnetic flux to share the stator tooth path and couple at the stator tooth tip by setting a main magnetic flux path and several anti-saturation magnetic flux paths. By changing the magnitude of the armature current, the magnetic flux of the anti-saturation magnetic flux path loop can be indirectly controlled by controlling the stator armature magnetic flux, realizing online adjustability of the air-gap magnetic flux, which is beneficial to improving the torque output of the motor at low speeds and increasing the field weakening ability of the motor at high speeds.

[0030] 3. The stator permanent magnet type flux-switching permanent magnet motor provided by the present invention has neither an excitation winding nor a permanent magnet on the rotor side, with a simple structure and strong reliability, avoiding the additional copper loss caused by introducing an electric excitation winding in the traditional hybrid excitation type flux-switching permanent magnet motor and improving the operating efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] These and / or other aspects and advantages of the present invention will become apparent and be readily understood from the following description of the preferred embodiments in conjunction with the drawings, wherein:

[0032] Figure 1 is an exploded schematic view of an anti-saturation adjustable flux stator permanent magnet type flux-switching permanent magnet motor according to an embodiment of the present invention;

[0033] Figure 2 is Figure 1 a schematic structural view of the rotor in

[0034] Figure 3 is Figure 1 a schematic structural view of the stator in

[0035] Figure 4 is Figure 1 a schematic diagram of the main magnetic flux path principle of the anti-saturation adjustable flux stator permanent magnet type flux-switching permanent magnet motor shown in

[0036] Figure 5 is Figure 1 a leakage magnetic flux path of the anti-saturation adjustable flux stator permanent magnet type flux-switching permanent magnet motor shown in

[0037] Figure 6 is Figure 1 a curve graph showing the variation of the direct-axis magnetic flux of the stator permanent magnet type flux-switching permanent magnet motor with the quadrature-axis current shown in

[0038] Figure 7 is Figure 1Flux linkage waveform diagram of the stator permanent magnet type flux switching permanent magnet motor shown;

[0039] Figure 8 is Figure 1 Flux distribution diagram of the stator permanent magnet type flux switching permanent magnet motor shown. Specific implementation manner

[0040] The technical solution of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0041] Refer to Figure 1 , which shows a stator permanent magnet type flux switching permanent magnet motor according to an embodiment of the present invention. In some embodiments, it may be, for example, an anti-saturation adjustable flux stator permanent magnet type flux switching permanent magnet motor.

[0042] The flux switching permanent magnet motor mainly includes two components, a rotor 1 and a stator 2, wherein the rotor 1 is on the outside of the stator 2, and an air gap 3 is provided between the stator and the rotor.

[0043] In the following text, the position close to the rotor 1 is referred to as being arranged on the outside or outer end, and the position far from the rotor 1 is referred to as the inside or inner end.

[0044] Refer to Figure 2 , the rotor 1 includes rotor teeth 1-2 and a rotor yoke 1-1 arranged between the rotor teeth 1-2, wherein the number of the rotor teeth 1-2 is n, which are arranged at equal intervals along the circumference, where n is a positive integer greater than 0; the inner pole arc width of the rotor teeth 1-2 is α oi , the outer pole arc width of the rotor teeth 1-2 is α oo , satisfying α oi <α oo .

[0045] Refer to Figure 3 , the stator 2 includes a plurality of stator teeth 2-5 arranged at equal intervals along the circumference, a stator yoke 2-7 located between two adjacent stator teeth 2-5, a stator tooth tip 2-1 located at the outer end of the stator teeth 2-5, a stator winding 2-2 arranged on the stator teeth, and a permanent magnet 2-6 arranged at the center of the stator teeth 2-5.

[0046] In some embodiments, the number of the stator teeth 2-5 is 3m, where m is a positive integer greater than 0; the pole arc width of the stator tooth tip 2-1 is β a , satisfying α oi <β a< π / 3m, so as to realize the switching of magnetic flux after the rotation of the rotor 1. The number of the permanent magnets 2-6 is the same as that of the stator teeth 2-5, specifically 3m, and they are embedded in the stator teeth 2-5. The outer ends of the permanent magnets 2-6 are flush with the outer ends of the stator teeth 2-5, the inner ends of the permanent magnets 2-6 are on the same circumference as the inner surface of the stator 2, and the long sides of the permanent magnets 2-6 are parallel to the stator teeth 2-5; the inner surface of the stator yoke 2-7 is on the same circumference as the inner ends of the permanent magnets 2-6.

[0047] In some embodiments, to meet the magnetic flux switching principle, the relationship between the number of stator teeth 2-5 and rotor teeth 1-2 satisfies n = 3km ± 2, where k is a positive integer greater than 1.

[0048] In some embodiments, the material of the permanent magnets 2-6 is neodymium iron boron material or any other feasible material. The permanent magnets 2-6 are made of neodymium iron boron material, and the stator and rotor are made of silicon steel sheet material. Similarly, those skilled in the art can select the materials of the permanent magnets 2-6, stator, and rotor according to the actual situation.

[0049] In some embodiments of the present invention, as Figures 1 - 5 shown, the tooth tip magnetic barrier includes a first tooth tip magnetic barrier 2-3 and a second tooth tip magnetic barrier 2-4 that are embedded with each other and have a gap therebetween. Specifically, the first tooth tip magnetic barrier 2-3 is embedded on the outside of the stator tooth tip 2-1, and the second tooth tip magnetic barrier 2-4 is embedded relative to the first tooth tip magnetic barrier 2-3 on the inside of the stator tooth tip 2-1. The cross-section of the first tooth tip magnetic barrier 2-3 is trapezoidal, with the long side of the trapezoid close to the air gap and the short side away from the air gap; the cross-section of the second tooth tip magnetic barrier 2-4 is basin-shaped, with the opening of the basin facing the air gap, and the two sides of the basin form a t i angle, satisfying 60° < t i < 90°.

[0050] It can be seen that the first tooth tip magnetic barrier 2-3 is embedded at the opening position of the second tooth tip magnetic barrier 2-4 and there is a gap between it and the second tooth tip magnetic barrier 2-4.

[0051] Or rather, the first tooth tip magnetic barrier 2-3 is generally arranged corresponding to the opening of the second tooth tip magnetic barrier 2-4 and is located above the opening. Or rather, the first tooth tip magnetic barrier 2-3 is embedded into the opening of the second tooth tip magnetic barrier 2-4 and there is a gap between it and the second tooth tip magnetic barrier 2-4.

[0052] It can be understood that only two layers of tooth tip magnetic barriers are provided here, and those skilled in the art can set three or more layers of tooth tip magnetic barriers according to needs, and the present invention does not make special restrictions on this.

[0053] Specifically, the stator permanent magnet type flux switching permanent magnet motor includes a main flux path for each stator tooth 2-5, see Figure 4 , showing a main magnetic flux path for one of the stator teeth 2-5, the magnetic flux path flows as follows: starting from the permanent magnet 2-6, passing through the stator tooth 2-5, the stator tooth tip 2-1, the air gap 3, the rotor tooth 1-2, the rotor yoke 1-1, the rotor tooth 1-2, the air gap 3, the stator tooth tip 2-1, the stator tooth 2-5 and then back to the permanent magnet 2-6.

[0054] In order to reduce the magnetic flux density at the ends of the permanent magnets, the stator permanent magnet type flux switching permanent magnet motor provided by the embodiment of the present invention is further designed with at least two anti-saturation magnetic flux paths for each stator tooth.

[0055] In some specific embodiments of the present invention, the stator permanent magnet type flux switching permanent magnet motor includes two anti-saturation flux paths for each stator tooth 2-5. Figure 5 , showing two anti-saturation flux paths for one of the stator teeth 2-5, the flux paths flow as follows:

[0056] Anti-saturation flux path 1: Starting from permanent magnet 2-6, passing through stator tooth 2-5, stator tooth tip 2-1, the outer magnetic bridge of tooth tip magnetic barrier 2-4, the outer magnetic bridge of tooth tip magnetic barrier 2-3, the outer magnetic bridge of tooth tip magnetic barrier 2-4, stator tooth tip 2-1, stator tooth 2-5 and then returning to permanent magnet 2-6.

[0057] Anti-saturation flux path 2: Starting from the permanent magnet 2-6, it passes through the stator tooth 2-5, the stator tooth tip 2-1, the outer magnetic bridge of the second tooth tip magnetic barrier 2-4, the magnetic bridge between the first tooth tip magnetic barrier 2-3 and the second tooth tip magnetic barrier 2-4, the outer magnetic bridge of the second tooth tip magnetic barrier 2-4, the stator tooth tip 2-1, the stator tooth 2-5, and then returns to the permanent magnet 2-6.

[0058] Specifically, the permanent magnet circuit flux flowing through the two anti-saturation flux paths is coupled with the cross-axis flux generated after current is passed through the stator winding 2-2 at the stator tooth tip, which not only reduces the magnetic flux density at the end of the permanent magnet, but also realizes the online adjustment of the air gap flux.

[0059] Specifically, at low speeds, increasing the armature current (the current in stator winding 2-2) weakens the permanent magnet flux in the anti-saturation flux path, strengthening the air gap magnetic field and the main magnetic flux, thereby increasing the motor's torque output (more torque at the same current). At high speeds, reducing the armature current (the current in stator winding 2-2) generates some leakage flux, which in turn increases the field-weakening flux per unit current at high speeds. This improves the motor's field-weakening capability and achieves field-weakening speed increases.

[0060] Adopt a control strategy with a direct-axis current of 0, and use the electromagnetic field simulation software ANSYS Maxwell to simulate the stator permanent magnet flux-switching permanent magnet motor provided by the embodiment of the present invention as Figure 1 shown. Set the outer diameter of the rotor to 160 mm, the inner diameter of the rotor to 120 mm, the air gap to 0.5 mm, the motor shaft length to 70 mm, the rated armature current to 30 A, the number of rotor teeth to 22, and the number of stator teeth to 12. The results are as Figures 6 - 8 shown.

[0061] Refer to Figure 6 , which shows that Figure 1 the direct-axis magnetic flux of the stator permanent magnet flux-switching permanent magnet motor shown presents a non-linear rising relationship with the quadrature-axis current. When the quadrature-axis current increases from 5 A to 30 A, the leakage magnetic flux of the motor decreases from 0.0017 Wb to 0.0001 Wb. Correspondingly, the direct-axis permanent magnet air-gap magnetic flux of the motor rises from 0.0171 Wb to 0.0188 Wb, indicating that the motor has the characteristic of adjustable flux with quadrature-axis current, and the amplitude of the air-gap magnetic flux of the motor can be indirectly changed by changing the quadrature-axis current. That is, by changing the magnitude of the armature current (when adopting a control strategy with a direct-axis current of 0, the direct-axis current is the armature current), the stator armature magnetic flux can be controlled to indirectly change the flux in the anti-saturation magnetic flux path loop, realizing online adjustable air-gap flux.

[0062] Figure 1 The three-phase magnetic flux waveforms of the stator permanent magnet flux-switching permanent magnet motor shown are as Figure 7 shown. It can be seen from the figure that the three-phase magnetic fluxes of the motor are sinusoidally distributed, the amplitudes of the magnetic fluxes are equal, and the phases are 120° out of phase with each other, indicating that the stator permanent magnet flux-switching permanent magnet motor proposed by the present invention has good feasibility.

[0063] Figure 1 The no-load magnetic flux distribution waveform of the stator permanent magnet flux-switching permanent magnet motor shown is as Figure 8 shown, including the main magnetic flux paths and anti-saturation magnetic flux paths corresponding to each stator tooth. It can be seen from the figure that: (1) The anti-saturation magnetic flux path forms a self-loop on the stator side, effectively reducing the magnetic density at the rotor tooth tip and alleviating the saturation degree of the stator teeth; (2) The main magnetic flux passes through the air gap and enters the rotor and then returns to the stator to form an effective loop.

[0064] A stator permanent magnet flux-switching permanent magnet motor according to an embodiment of the present invention has at least one of the following advantages:

[0065] 1. For the stator permanent magnet flux-switching permanent magnet motor provided by the present invention, by setting at least two layers of tooth tip magnetic barriers, the magnetic density at the end of the permanent magnet is reduced, the magnetic circuit saturation of the stator teeth of the flux-switching permanent magnet motor is alleviated, and the overload capacity of this type of motor is improved.

[0066] 2. The stator permanent magnet flux-switching permanent magnet motor provided by the present invention sets one main flux path and several anti-saturation flux paths, enabling the leakage flux at the end of the permanent magnet and the armature flux to share the stator tooth path and couple at the stator tooth tip. By changing the magnitude of the armature current, the stator armature flux can be controlled to indirectly change the flux in the anti-saturation flux path loop, realizing the on-line adjustability of the air-gap flux.

[0067] 3. For the stator permanent magnet flux-switching permanent magnet motor provided by the present invention, there is neither an excitation winding nor a permanent magnet on the rotor side. It has a simple structure and high reliability, avoiding the additional copper loss caused by introducing an electric excitation winding in the traditional hybrid excitation flux-switching permanent magnet motor and improving the operating efficiency of the motor.

[0068] Although some embodiments of the general inventive concept have been shown and described, those of ordinary skill in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the general inventive concept. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator permanent magnet flux-switching permanent magnet motor, comprising: A stator, the stator includes a plurality of stator teeth, stator tooth tips located at the outer ends of the stator teeth, stator windings arranged on the stator teeth, permanent magnets embedded in the stator teeth, and at least two tooth tip magnetic barriers embedded in the stator tooth tips; A rotor, sleeved outside the stator; An air gap, located between the stator and the rotor; Wherein, the at least two tooth tip magnetic barriers include a first tooth tip magnetic barrier and a second tooth tip magnetic barrier that are embedded with each other and have a gap therebetween.

2. The stator permanent magnet flux-switching permanent magnet motor according to claim 1, wherein The first tooth tip magnetic barrier is embedded on the outer side of the stator tooth tip. The second tooth tip magnetic barrier is embedded relative to the first tooth tip magnetic barrier on the inner side of the stator tooth tip. The cross-section of the second tooth tip magnetic barrier is in a basin shape, with its opening facing the air gap, and both sides of the basin shape form an angle of t i satisfying 60° < t i < 90°.

3. The stator permanent magnet flux-switching permanent magnet motor according to claim 2, wherein The cross-section of the first tooth tip magnetic barrier is trapezoidal, the long side of the trapezoid is close to the air gap, and the short side of the trapezoid is away from the air gap.

4. The stator permanent magnet flux-switching permanent magnet motor according to claim 3, wherein The first tooth tip magnetic barrier is arranged at the opening position of the second tooth tip magnetic barrier and there is a gap between the first tooth tip magnetic barrier and the second tooth tip magnetic barrier.

5. The stator permanent magnet flux-switching permanent magnet motor according to claim 1, wherein The number of the stator teeth is 3m, where m is a positive integer greater than 0; The rotor teeth are a total of n, arranged at equal intervals along the circumference, where n = 3km ± 2, and k is a positive integer greater than 1; the inner pole arc width of the rotor teeth is α oi , and the outer pole arc width of the rotor teeth is α oo , satisfying α oi < α oo .

6. The stator permanent magnet flux-switching permanent magnet motor according to claim 5, wherein The pole arc width of the stator teeth is β a , satisfying α oi < β a < π / 3m.

7. The stator permanent magnet flux-switching permanent magnet motor according to any one of claims 1-6, wherein When the stator permanent magnet flux-switching permanent magnet motor operates, two anti-saturation flux paths are formed for each stator tooth; The permanent magnet circuit flux flowing through the anti-saturation flux path is coupled with the quadrature-axis flux generated after the stator winding is energized at the stator tooth tip.

8. The stator permanent magnet flux-switching permanent magnet motor according to claim 7, wherein The flux path directions of the two anti-saturation flux paths are as follows: Anti-saturation flux path one: Starting from the permanent magnet, passing through the stator tooth, stator tooth tip, outer magnetic bridge of the first tooth tip magnetic barrier, outer magnetic bridge of the first tooth tip magnetic barrier, outer magnetic bridge of the second tooth tip magnetic barrier, stator tooth tip, stator tooth and then back to the permanent magnet; Anti-saturation flux path two: Starting from the permanent magnet, passing through the stator tooth, stator tooth tip, outer magnetic bridge of the first tooth tip magnetic barrier, magnetic bridge between the first tooth tip magnetic barrier and the second tooth tip magnetic barrier, outer magnetic bridge of the second tooth tip magnetic barrier, stator tooth tip, stator tooth and then back to the permanent magnet.

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