Stator permanent magnet type flux switching permanent magnet motor

Abstract

An embodiment of the present invention provides a stator permanent magnet type flux switching permanent magnet motor, belonging to the field of motors. The stator permanent magnet type flux switching permanent magnet motor comprises: a rotor and a stator arranged from the outside to the inside, with an air gap provided between the stator and the rotor; a plurality of tooth tip magnetic barriers are provided on the stator side to guide the passage of the permanent magnet flux, effectively reducing the magnetic flux density at the end of the permanent magnet and alleviating the local saturation of the stator teeth. When the armature current flowing through the stator winding increases, the cross-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 show a relationship of increase and decrease, thereby achieving online adjustment of the magnetic field of the stator permanent magnet type flux switching permanent magnet motor. By constructing stator tooth tip magnetic barriers, directionally changing the permanent magnet magnetic flux path, and designing the stator tooth tip magnetic flux intersection area, the present invention alleviates the tooth saturation of traditional flux switching permanent magnet motors, improves the overload capacity of flux switching permanent magnet motors, and broadens the speed regulation range of the motor.

Description

Technical Field

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

[0002] A stator permanent magnet flux-switching permanent magnet motor (PMSM) is a new type of permanent magnet synchronous motor. Its permanent magnets are embedded in the stator core, preventing direct contact with the air outside the stator. Its rotor features a salient-pole structure. This stator permanent magnet flux-switching PMSM inherits the advantages of brushless double-salient-pole motors, which lack both permanent magnets and windings in the rotor. Its structure is simple and durable. With its high torque density, high efficiency, and simple structure, PMSMs are widely used in electric vehicles, servo drives, industrial automation, and other fields.

[0003] However, since the permanent magnets are all 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, causing the stator teeth of this type of motor to be easily saturated under large currents, greatly reducing the overload capacity of this type of motor, which is one of the unfavorable factors affecting the torque output of this type of motor.

[0004] Chinese patent application publication number CN117650645A (invention title: A Mechanically Magnetic Flux-Switching Permanent Magnet Motor) proposes a mechanically magnetic flux-switching permanent magnet motor. While the motor is running, the intermediate stator ring can be rotated through other power-assist devices to change its relative position with the outer stator, achieving online adjustment of the air gap magnetic field. However, this motor relies on a mechanical structure for magnetic field adjustment, and its reliability at high speeds is poor.

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

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

[0007] The purpose of the present invention is to at least partially solve the above-mentioned technical problems, and to provide a stator permanent magnet type flux switching permanent magnet motor, which can alleviate the saturation of the stator tooth magnetic circuit of the current flux switching permanent magnet motor, improve the utilization rate of the permanent magnet, realize the adjustable air gap flux of this type of motor, and improve the torque output and overload capacity of the motor.

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

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

[0010] A stator comprising a plurality of stator teeth, stator tooth tips located at 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] The rotor is sleeved on the outside of the stator;

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

[0013] The at least two tooth tip magnetic barriers include a first tooth tip magnetic barrier and a second tooth tip magnetic barrier which are embedded in 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 in the outer side of the stator tooth tip, and the second tooth tip magnetic barrier is embedded in the inner side of the stator tooth tip relative to the first tooth tip magnetic barrier. The cross section of the second tooth tip magnetic barrier is basin-shaped, with its opening facing the air gap, and the two sides of the basin are t i Angle, meet 60° <t i <90°.

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

[0017] In some embodiments, the first tooth tip magnetic barrier is disposed at an opening position of the second tooth tip magnetic barrier and a gap is provided between the first tooth tip magnetic barrier and 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 number of rotor teeth is n, which are 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 , 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 stator teeth, which is 3m, and is embedded in the stator teeth, wherein the outer end of the permanent magnet is flush with the outer end of the stator tooth, the inner end of the permanent magnet is located on the same circumference as the inner surface of the stator, and the long side of the permanent magnet is parallel to the stator teeth; the inner surface of the stator yoke and the inner end of the permanent magnet are located on the same circumference.

[0021] In some embodiments, when the stator permanent magnet type flux switching permanent magnet motor is in operation, a main magnetic flux path is formed, which corresponds to a stator tooth and passes through an air gap into the rotor and then returns to the stator.

[0022] In some embodiments, the stator permanent magnet type flux switching permanent magnet motor forms at least two anti-saturation magnetic flux paths corresponding to each stator tooth during operation; the permanent magnet circuit magnetic flux flowing through the anti-saturation magnetic flux path is coupled with the cross-axis magnetic flux generated after current is passed through the stator winding at the stator tooth tip.

[0023] In some embodiments, the rotor includes a rotor yoke and rotor teeth, and the magnetic flux path of the main magnetic flux path flows 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, 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 the flux paths flow as follows:

[0025] Anti-saturation flux path 1: Starting from the permanent magnet, passing through the stator tooth, the stator tooth tip, 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, the stator tooth tip, the stator tooth, and then back to the permanent magnet.

[0026] Anti-saturation flux path 2: Starting from the permanent magnet, passing through the stator teeth, the stator tooth tip, 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, the stator tooth tip, the stator teeth and then back to the permanent magnet.

[0027] The 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 flux density at the ends of the permanent magnets by providing at least two layers of tooth tip magnetic barriers, alleviates the saturation of the magnetic circuit 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 flux-switching permanent magnet motor provided by the present invention provides a main flux path and several anti-saturation flux paths, so that the leakage flux at the end of the permanent magnet and the armature flux 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 anti-saturation flux path loop flux, realizing online adjustment of the air gap flux, which is beneficial to improving the torque output of the motor at low speeds and increasing the motor's magnetic weakening capability at high speeds.

[0030] 3. The stator permanent magnet type flux switching permanent magnet motor provided by the present invention has neither excitation windings nor permanent magnets on the rotor side. It has a simple structure and strong reliability. It avoids the extra copper loss caused by the introduction of electric excitation windings in traditional hybrid excitation flux switching permanent magnet motors, thereby improving the motor's operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0033] Figure 2 for Figure 1 Schematic diagram of the structure of the middle rotor;

[0034] Figure 3 for Figure 1 Schematic diagram of the structure of the stator;

[0035] Figure 4 for Figure 1 The main flux path principle diagram of the anti-saturation adjustable flux stator permanent magnet type flux switching permanent magnet motor shown;

[0036] Figure 5 for Figure 1 The leakage magnetic flux path of the anti-saturation adjustable flux stator permanent magnet type flux switching permanent magnet motor shown;

[0037] Figure 6 for Figure 1 The curve diagram of the change of the direct-axis flux linkage of the stator permanent magnet type flux switching permanent magnet motor with the quadrature-axis current shown;

[0038] Figure 7 for Figure 1The magnetic flux waveform of the stator permanent magnet type flux switching permanent magnet motor shown;

[0039] Figure 8 for Figure 1 The flux distribution diagram of the stator permanent magnet type flux switching permanent magnet motor is shown. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be further described in detail below through examples and 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 limiting the present invention.

[0041] See also Figure 1 , shows a stator permanent magnet type flux switching permanent magnet motor according to an embodiment of the present invention. In some embodiments, it can 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 outside the stator 2 , and an air gap 3 is provided between the stator and the rotor.

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

[0044] See also 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 and they 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 tooth 1-2 is α oo , satisfying α oi <α oo .

[0045] See also 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 tooth 2-5, a stator winding 2-2 arranged on the stator tooth, and a permanent magnet 2-6 arranged at the center of the stator tooth 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 achieve magnetic flux switching after the rotor 1 rotates. The number of the permanent magnets 2-6 is the same as the number of the stator teeth 2-5, specifically 3m, and is 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 located 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 located on the same circumference as the inner ends of the permanent magnets 2-6.

[0047] In some embodiments, to satisfy the flux switching principle, the quantity relationship between the stator teeth 2-5 and the 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 magnet 2-6 is neodymium iron boron material or any other feasible material. The permanent magnet 2-6 is 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 magnet 2-6, stator, and rotor according to actual conditions.

[0049] In some embodiments of the present invention, Figure 1-5 As 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 in each other and have a gap between them. Specifically, the first tooth tip magnetic barrier 2-3 is embedded in the outer side of the stator tooth tip 2-1, and the second tooth tip magnetic barrier 2-4 is embedded in the inner side of the stator tooth tip 2-1 relative to the first tooth tip magnetic barrier 2-3. 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 of the trapezoid 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 being t i Angle, meet 60° <t i <90°.

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

[0051] In other words, the first tooth tip magnetic barrier 2-3 is substantially arranged corresponding to the opening of the second tooth tip magnetic barrier 2-4 and is located above the opening. In other words, the first tooth tip magnetic barrier 2-3 is embedded in the opening of the second tooth tip magnetic barrier 2-4 and there is a gap between the first tooth tip magnetic barrier 2-3 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 provide three or more layers of tooth tip magnetic barriers as needed, and the present invention does not impose any particular limitation on this.

[0053] Specifically, the stator permanent magnet 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] The control strategy of direct axis current being 0 is adopted, and the electromagnetic field simulation software ANSYS Maxwell is used to simulate the embodiment of the present invention. Figure 1 The stator permanent magnet flux switching permanent magnet motor shown in the figure is simulated with the rotor outer diameter set to 160mm, the rotor inner diameter to 120mm, the air gap to 0.5mm, the motor shaft length to 70mm, the rated armature current to 30A, the number of rotor teeth to 22, and the number of stator teeth to 12. The results are as follows Figure 6-8 shown.

[0061] See also Figure 6 , showing Figure 1 The direct-axis flux linkage of the stator permanent magnet flux-switching permanent magnet motor shown in the figure exhibits a nonlinear increase with quadrature-axis current. When the quadrature-axis current increases from 5A to 30A, the motor's leakage flux decreases from 0.0017Wb to 0.0001Wb. Correspondingly, the motor's direct-axis permanent magnet air gap flux linkage increases from 0.0171Wb to 0.0188Wb, demonstrating that the motor exhibits quadrature-axis current-adjustable flux characteristics. The air gap flux amplitude can be indirectly varied by varying the quadrature-axis current. Specifically, by varying the armature current (when the direct-axis current is zero, the direct-axis current is the armature current), the stator armature flux can be controlled, indirectly altering the anti-saturation flux path loop flux, achieving online air gap flux adjustment.

[0062] Figure 1 The three-phase flux waveform of the stator permanent magnet type flux switching permanent magnet motor is shown as Figure 7 As shown in the figure, it can be seen that the three-phase flux of the motor is sinusoidally distributed, the flux amplitudes are equal, and the phases are 120° apart, indicating that the stator permanent magnet type flux switching permanent magnet motor proposed in the present invention has good feasibility.

[0063] Figure 1 The no-load flux distribution waveform of the stator permanent magnet type flux switching permanent magnet motor is shown as Figure 8 As shown in the figure, it includes the main magnetic flux path and the anti-saturation magnetic flux path corresponding to each stator tooth. It can be seen from the figure that: (1) the anti-saturation magnetic flux path forms a self-circuit on the stator side, effectively reducing the magnetic flux 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 into the rotor and then returns to the stator to form an effective circuit.

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

[0065] 1. The stator permanent magnet type flux switching permanent magnet motor provided by the present invention reduces the magnetic flux density at the ends of the permanent magnets by providing at least two layers of tooth tip magnetic barriers, alleviates the saturation of the magnetic circuit of the stator teeth of the flux switching permanent magnet motor, and improves the overload capacity of this type of motor.

[0066] 2. The stator permanent magnet flux switching permanent magnet motor provided by the present invention provides a main magnetic flux path and multiple anti-saturation magnetic flux paths, so that the leakage magnetic flux at the end of the permanent magnet and the armature magnetic flux share the stator tooth path and couple at the stator tooth tip. By changing the magnitude of the armature current, the stator armature magnetic flux can be controlled to indirectly change the magnetic flux of the anti-saturation magnetic flux path loop, thereby realizing online adjustment of the air gap magnetic flux.

[0067] 3. The stator permanent magnet type flux switching permanent magnet motor provided by the present invention has neither excitation windings nor permanent magnets on the rotor side. It has a simple structure and strong reliability. It avoids the extra copper loss caused by the introduction of electric excitation windings in traditional hybrid excitation flux switching permanent magnet motors, thereby improving the motor's operating efficiency.

[0068] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. A stator permanent magnet type flux switching permanent magnet motor, comprising: A stator comprising a plurality of stator teeth, stator tooth tips located at 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; The rotor is sleeved on the outside of the stator; air gap, located between the stator and rotor; The at least two tooth tip magnetic barriers include a first tooth tip magnetic barrier and a second tooth tip magnetic barrier which are embedded in each other and have a gap therebetween. The first tooth tip magnetic barrier is embedded in the outer side of the stator tooth tip, and the second tooth tip magnetic barrier is embedded in the inner side of the stator tooth tip relative to the first tooth tip magnetic barrier. The cross section of the second tooth tip magnetic barrier is basin-shaped, and its opening faces the air gap.

2. The stator permanent magnet type flux switching permanent magnet motor according to claim 1, characterized in that: The basin is t-shaped on both sides i Angle, meet 60° <t i <90°.

3. The stator permanent magnet type flux switching permanent magnet motor according to claim 2, characterized in that: The cross section of the first tooth tip magnetic barrier is trapezoidal, with the long side of the trapezoid close to the air gap and the short side of the trapezoid far from the air gap.

4. The stator permanent magnet type flux switching permanent magnet motor according to claim 3, characterized in that: The first tooth tip magnetic barrier is arranged at an opening position of the second tooth tip magnetic barrier and a gap is provided between the first tooth tip magnetic barrier and the second tooth tip magnetic barrier.

5. The stator permanent magnet type flux switching permanent magnet motor according to claim 1, characterized in that: The number of the stator teeth is 3m, where m is a positive integer greater than 0; The rotor has n rotor teeth arranged at equal intervals along the circumference, wherein 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 <α oo .

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

7. The stator permanent magnet type flux switching permanent magnet motor according to any one of claims 1 to 6, characterized in that: The stator permanent magnet type flux switching permanent magnet motor forms two anti-saturation flux paths for each stator tooth during operation; The permanent magnet circuit magnetic flux flowing through the anti-saturation magnetic flux path is coupled with the quadrature-axis magnetic flux generated after current is passed through the stator winding at the stator tooth tip.

8. The stator permanent magnet type flux switching permanent magnet motor according to claim 7, characterized in that: The magnetic flux paths of the two anti-saturation magnetic flux paths flow as follows: Anti-saturation flux path 1: Starting from the permanent magnet, passing through the stator tooth, the stator tooth tip, 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, the stator tooth tip, the stator tooth, and then back to the permanent magnet; Anti-saturation flux path 2: Starting from the permanent magnet, passing through the stator teeth, the stator tooth tip, 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, the stator tooth tip, the stator teeth and then back to the permanent magnet.

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