A dual-stator bearingless switched reluctance motor

Abstract

The present application provides a dual-stator bearingless switched reluctance motor, comprising a first stator, a rotor, and a second stator, wherein the second stator is embedded in the inner side of the first stator, the rotor is located between the first stator and the second stator, and air gaps are provided between the first stator and the rotor, as well as between the rotor and the second stator, so that the rotor can rotate between the first stator and the second stator. The first stator adopts a hybrid stator pole structure, the rotor adopts a cylindrical structure, and the second stator adopts a salient pole structure, wherein the second stator block can be divided into a "C"-shaped structure and an "E"-shaped structure. The present application solves the problems of traditional bearingless switched reluctance motors, such as the mutual coupling of torque and suspension force control, the mutual coupling of magnetic flux generated by suspension force poles in different directions, and the small suspension force generated in some rotor positions, which lead to complex motor control circuits, high control costs, and difficult control algorithms.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a dual-stator bearingless switched reluctance motor. Background Art

[0002] With the development of modern industrial technology, high-speed motors and generators have gained widespread application. Traditional high-speed motor shafts are generally supported by mechanical bearings. However, mechanical bearings can wear out and generate significant heat at high speeds. In severe cases, this can lead to uneven air gaps in the motor, generating mechanical vibration and noise, which degrades the motor's dynamic characteristics and reduces motor efficiency and system reliability. Compared to mechanical bearings, magnetic bearings offer a range of advantages, including non-contact, wear-free operation, high speed, long life, and ease of active control. However, magnetic bearings only serve as suspension supports in the motor and do not generate any torque. Furthermore, their presence increases the motor's axial length, reducing the rotor's critical speed and hindering further increases in the motor's output power density. Compared to magnetic bearing motors, bearingless motors have suspended windings wound around the stator poles. For equivalent power, their axial length can be designed to be shorter, reducing the motor's axial dimensions and increasing the rotor's critical speed, significantly improving the motor's output power density.

[0003] Bearingless switched reluctance motors (SRMs) combine the advantages of both SRMs and bearingless technology, offering broad application prospects in high-speed drive applications such as centrifuges, compressors, high-speed machine tools, flywheel energy storage, and aerospace. However, conventional bearingless SRMs suffer from problems such as the coupling between torque and suspension force control, the coupling of magnetic flux generated by suspension force poles in different directions, and low suspension force generated in some rotor positions. These issues lead to complex control circuits, high control costs, and difficult control algorithms. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a dual-stator bearingless switched reluctance motor, which can solve the problems of traditional bearingless switched reluctance motors due to the mutual coupling of torque and suspension force control, the mutual coupling of magnetic fluxes generated by suspension force poles in different directions, and the small suspension force generated under some rotor positions, resulting in complex control circuits, high control costs, and difficult control algorithms.

[0005] To solve the above problems, the present application provides a dual-stator bearingless switched reluctance motor, comprising a first stator, a rotor, and a second stator, wherein the second stator is embedded inside the first stator, the rotor is located between the first stator and the second stator, and air gaps are provided between the first stator and the rotor, and between the rotor and the second stator, so that the rotor can rotate between the first stator and the second stator;

[0006] The first stator adopts a hybrid stator pole structure;

[0007] The rotor adopts a cylindrical structure;

[0008] The second stator adopts a salient pole structure, including a second stator block, a second stator magnetic isolation ring and a suspension winding coil. The suspension winding coil is wound on the second stator block, and the second stator block is evenly embedded in the second stator magnetic isolation ring along the circumferential direction outside the second stator magnetic isolation ring.

[0009] According to the shape structure of the second stator block, the second stator block structure is divided into a "C"-shaped structure and an "E"-shaped structure.

[0010] The rotor adopts a cylindrical structure, which includes rotor blocks, a rotor magnetic isolation ring and an annular iron core. There are eight rotor blocks. The rotor blocks are evenly and evenly embedded in the outer side of the rotor magnetic isolation ring along the circumferential direction of the rotor magnetic isolation ring. The annular iron core is embedded in the inner side of the rotor magnetic isolation ring, so that the rotor magnetic isolation ring separates the magnetic flux flowing between the rotor and the first stator and the magnetic flux flowing between the rotor and the second stator.

[0011] The rotor block is fan-shaped, the eight rotor blocks are identical in size and shape, and the inner and outer surfaces of the rotor are smooth.

[0012] Optionally, the number of the second stator blocks is four, and the four second stator blocks are evenly distributed along the circumferential direction of the outer side of the second stator magnetic isolation ring and embedded in the second stator magnetic isolation ring.

[0013] Optionally, the second stator block is in a C-shaped structure, that is, the second stator block is in a C-shaped structure, and the second stator block has two stator poles, and the pole arcs of the two stator poles are equal;

[0014] The suspension winding coils are respectively wound on two stator poles of the second stator block, wherein the winding directions of the suspension winding coils on the two stator poles are opposite, and the suspension winding coils are connected in series to form one phase.

[0015] Optionally, the second stator block is in an "E" shape, that is, the second stator block has three stator poles, wherein the stator poles located on both sides of the center line of the second stator block are first stator poles, and the stator pole located on the center line is a second stator pole;

[0016] The width of the first stator pole is smaller than the width of the second stator pole, and the pole arc of the first stator pole is equal to half of the pole arc of the second stator pole;

[0017] The suspension winding coil is wound only on the second stator pole of the second stator block, and the suspension winding coil alone constitutes one phase.

[0018] Optionally, the suspension winding coils have the same number of turns and are all concentrated windings.

[0019] Optionally, the first stator adopts a hybrid stator pole structure, which includes excitation poles and auxiliary poles, and the excitation poles and auxiliary poles are formed by extending radially inward from the inner wall of the first stator, wherein the number of the excitation poles and the auxiliary poles are both six, and they are the same in size and shape;

[0020] The six excitation poles and the six auxiliary poles are all arranged at equal intervals on the inner side of the first stator along the circumferential direction of the first stator, wherein the pole arc width of the excitation pole is greater than twice the pole arc width of the auxiliary pole.

[0021] Optionally, the six excitation poles are respectively wound with a torque winding coil I, a torque winding coil II, a torque winding coil III, a torque winding coil IV, a torque winding coil V, and a torque winding coil VI, and all of the torque winding coils are wound in the same direction. Furthermore, all of the torque winding coils have the same number of turns and are centralized windings.

[0022] The six auxiliary poles are neither wound with winding coils nor have permanent magnets.

[0023] Optionally, the torque winding coils on the two excitation poles of the first stator that are arranged opposite to each other in diameter are connected to form one phase.

[0024] Optionally, the first stator, rotor block, annular core and second stator block are all made of materials with magnetic conductivity;

[0025] The rotor magnetic isolation ring and the second stator magnetic isolation ring are both made of materials that do not have magnetic conductivity;

[0026] The torque winding coil I, the torque winding coil II, the torque winding coil III, the torque winding coil IV, the torque winding coil V, the torque winding coil VI and the suspension winding coil are all made of conductive copper wire.

[0027] Beneficial effects

[0028] In an embodiment of the present invention, a dual-stator bearingless switched reluctance motor is provided. With the second stator located inside the first stator, the rotor rotates between the first and second stators. Due to the action of the rotor's magnetic isolation ring, the magnetic flux generated by the torque winding coils does not enter the annular core and the second stator, and the magnetic flux generated by the suspension winding coils does not enter the rotor block and the first stator. Therefore, the magnetic flux generated by the torque winding coils and the magnetic flux generated by the suspension winding coils are independent of each other, achieving a natural decoupling of torque and suspension force control. By forming a closed loop between the excitation poles and auxiliary poles in the first stator and the rotor block of the rotor, the magnetic flux path is shortened, effectively reducing leakage flux, improving magnetic flux utilization, and thereby lowering magnetomotive force requirements. Furthermore, this structure eliminates reverse magnetic flux within the first stator during torque winding commutation, reducing the motor's core losses and thereby improving the motor's power density and efficiency. The "C" or "E"-shaped structure in the second stator forms a closed loop with the rotor's annular core, shortening the closed path of the magnetic flux generated by the suspension winding coils. Furthermore, thanks to the second stator's magnetic isolation ring, the magnetic flux generated by the suspension windings does not enter the adjacent second stator blocks, eliminating magnetic flux coupling between suspension poles in different directions. Furthermore, because the rotor utilizes a cylindrical structure with a smooth inner surface free of protrusions, the motor generates a stable suspension force at any rotor rotational position. This solves the problems of conventional bearingless switched reluctance motors, such as the mutual coupling of torque and suspension force control, the mutual coupling of magnetic flux generated by suspension poles in different directions, and the low suspension force generated at some rotor positions, which in turn lead to complex control circuits, high control costs, and difficult control algorithms. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a dual-stator bearingless switched reluctance motor according to an embodiment of the present application;

[0030] Figure 2 This is a schematic structural diagram of a first stator according to an embodiment of the present application;

[0031] Figure 3 This is a schematic structural diagram of a rotor according to an embodiment of the present application;

[0032] Figure 4 This is a schematic structural diagram of the second stator "C"-shaped structure of an embodiment of the present application;

[0033] Figure 5 This is a schematic structural diagram of the second stator "E"-shaped structure of an embodiment of the present application;

[0034] Figure 6 This is a structural schematic diagram of the overall assembly state of the dual-stator bearingless switched reluctance motor according to an embodiment of the present application;

[0035] Figure 7This is a structural schematic diagram of the second overall assembly state of the dual-stator bearingless switched reluctance motor according to an embodiment of the present application;

[0036] Figure 8 A schematic diagram of the magnetic flux path for powering the torque winding coil of an embodiment of the present application;

[0037] Figure 9 This is a schematic diagram of the electromagnetic flow path for the suspended winding coil of the second stator "C"-shaped structure in an embodiment of the present application;

[0038] Figure 10 This is a schematic diagram of the electromagnetic conduction path for the suspended winding coil of the second stator "E"-shaped structure in an embodiment of the present application.

[0039] The reference numerals indicate:

[0040] 1. First stator; 10. Excitation pole; 11. Auxiliary pole;

[0041] 2. Rotor; 20. Rotor block; 21. Rotor magnetic isolation ring; 22. Ring core;

[0042] 3. Second stator; 30. Second stator block; 31. Second stator magnetic isolation ring; 32. Suspended winding coil;

[0043] 4. Torque winding coil; 4a. Torque winding coil I; 4b. Torque winding coil II; 4c. Torque winding coil III; 4d. Torque winding coil IV; 4e. Torque winding coil V; 4f. Torque winding coil VI. DETAILED DESCRIPTION

[0044] See also Figures 1 to 10 As shown, according to an embodiment of the present application, a dual-stator bearingless switched reluctance motor is characterized in that it includes a first stator 1, a rotor 2, and a second stator 3, the second stator 3 is embedded in the inner side of the first stator 1, the rotor 2 is located between the first stator 1 and the second stator 3, and air gaps are provided between the first stator 1 and the rotor 2, as well as between the rotor 2 and the second stator 3, so that the rotor 2 can rotate between the first stator 1 and the second stator 3;

[0045] The first stator 1 adopts a hybrid stator pole structure, including six excitation poles 10 and six auxiliary poles 11. The torque winding coil 4 is wound on the excitation poles 10, and the auxiliary poles 11 have neither winding coils nor permanent magnet blocks.

[0046] The rotor 2 adopts a cylindrical structure, wherein the cylindrical structure includes a rotor block 20, a rotor magnetic isolation ring 21 and an annular iron core 22. There are eight rotor blocks 20. The rotor blocks 20 are evenly and equidistantly embedded in the outer side of the rotor magnetic isolation ring 21 along the circumferential direction of the rotor magnetic isolation ring 21, and the annular iron core 22 is embedded in the inner side of the rotor magnetic isolation ring 21, so that the rotor magnetic isolation ring 21 separates the magnetic flux flowing between the rotor 2 and the first stator 1 and the magnetic flux flowing between the rotor 2 and the second stator 3.

[0047] The second stator 3 adopts a salient pole structure, including a second stator block 30, a second stator magnetic isolation ring 31 and a suspension winding coil 32. The suspension winding coil 32 is wound on the second stator block 30, and the second stator block 30 is evenly embedded in the second stator magnetic isolation ring 31 along the circumferential direction of the outer side of the second stator magnetic isolation ring 31; according to the shape structure of the second stator block 30, the structure of the second stator block 30 is divided into a "C"-shaped structure and an "E"-shaped structure.

[0048] By embedding the second stator 3 into the first stator 1, and the rotor 2 being arranged between the first stator 1 and the second stator 3, and the rotor 2 rotating between the first stator 1 and the second stator 3, a short magnetic circuit structure is formed between the first stator 1 and the rotor 2, and between the second stator 3 and the rotor 2, thereby reducing leakage flux, improving flux efficiency, and eliminating the reverse flux in the first stator 1 when the torque winding is commutated, reducing core loss, and improving the power density and efficiency of the motor. In addition, due to the magnetic isolation effect of the rotor magnetic isolation ring 21 and the second stator magnetic isolation ring 31 and the smooth and non-protrusion structure inside the annular core, the dual-stator bearingless switched reluctance motor realizes decoupling control of torque and suspension force, eliminates the flux coupling between poles with different suspension forces, and ensures that a stable suspension force can be generated at any rotor position, thereby simplifying the control algorithm and reducing control cost and difficulty.

[0049] Furthermore, the first stator 1 is located at the outermost side, the second stator 3 is located at the innermost side, the rotor 2 is located between the first stator 1 and the second stator 3, and air gaps are provided between the first stator 1 and the rotor 2 and between the rotor 2 and the second stator 3, wherein the air gaps are equal gaps, that is, the air gap between the first stator 1 and the rotor 2 is equal to the air gap between the rotor 2 and the second stator 3.

[0050] like Figure 2 、 Figure 6 and Figure 7As shown, the first stator 1 has twelve stator poles, including six excitation poles 10 of the same shape and size and six auxiliary poles 11 of the same shape and size, which are evenly distributed along the inner circumferential direction of the first stator 1 at equal intervals. The pole arc width of the excitation pole 10 is greater than twice the pole arc width of the auxiliary pole 11. The six excitation poles 10 are respectively wound with the same number of turns of the centralized torque winding coil I4a, torque winding coil II4b, torque winding coil III4c, torque winding coil IV4d, torque winding coil V4e and torque winding coil VI4f. The torque winding coil 4 is used to generate rotational torque, and the winding direction of all torque winding coils 4 is the same.

[0051] Furthermore, the six auxiliary poles 11 are neither wound with any torque winding coil 4 nor contain permanent magnets. They only provide a circuit for the magnetic flux generated by the torque winding coil 4 .

[0052] Furthermore, the torque winding coils 4 on the two diametrically opposite excitation poles 10 of the first stator 1 are connected in series to form a phase, such as the torque winding coil I4a and the torque winding coil IV4d are connected in series to form a phase, the torque winding coil II4b and the torque winding coil V4e are connected in series to form a phase, and the torque winding coil III4c and the torque winding coil VI4f are connected in series to form a phase.

[0053] like Figure 3 、 Figure 6 and Figure 7 As shown, the rotor 2 is composed of eight rotor segments 20 of identical shape and size, a rotor magnetic isolation ring 21, and an annular iron core 22. The eight rotor segments 20 are evenly distributed along the outer circumference of the rotor magnetic isolation ring 21 and are respectively embedded in the rotor magnetic isolation ring 21. The eight rotor segments 20 and the first stator 1 form an outer unit motor for generating rotational torque.

[0054] Furthermore, the annular iron core 22 is embedded in the inner side of the rotor magnetic isolation ring 21 , and the annular iron core 22 and the second stator 3 constitute an inner unit motor for generating a suspension force.

[0055] Furthermore, the rotor magnetic isolation ring 21 connects the eight rotor segments 20 and the annular core 22. This not only secures the rotor segments 20 and the annular core 22 but also separates the magnetic flux generated by the torque winding coil 4 from the magnetic flux generated by the suspension winding coil 32, thereby achieving decoupled control of torque and suspension force. The rotor 2 is a cylindrical structure with smooth inner and outer surfaces and no protrusions. This ensures a stable suspension force at all rotor rotational positions and reduces wind friction losses during high-speed rotation.

[0056] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the second stator 3 includes four second stator blocks 30 of the same shape and size, a second stator magnetic isolation ring 31 and a suspension winding coil 32. The second stator block 30 has two structural forms, namely, the salient pole structure is divided into a "C"-shaped structure and an "E"-shaped structure. The four second stator blocks 30 are evenly distributed along the outer circumferential direction of the second stator magnetic isolation ring 31 and are embedded in the second stator magnetic isolation ring 31. The suspension winding coil 32 is respectively wound on the four second stator blocks 30, and the suspension winding coil 32 on each second stator block 30 constitutes a phase for generating suspension force. The second stator magnetic isolation ring 31 not only plays the role of fixing the second stator block 30, but also can separate the magnetic flux generated by the suspension winding coils 32 wound on different second stator blocks 30, eliminating the magnetic flux coupling between different suspension force poles, thereby reducing the difficulty of suspension force control.

[0057] As an embodiment, the second stator block 30 is a "C" shaped structure, such as Figure 4 and Figure 6 As shown, the structure has two stator poles, and the pole arcs of the two stator poles are equal.

[0058] Furthermore, the suspension winding coils 32 are respectively wound on the two stator poles of the second stator block 30 , but the winding directions of the suspension winding coils 32 on the two stator poles are opposite, and they are connected in series to form one phase.

[0059] As another embodiment, the second stator block 30 is an "E" shaped structure, such as Figure 5 and Figure 7 As shown, the structure has three stator poles, wherein the stator poles on both sides of the center line of the second stator block 30 are the first stator poles, and the stator pole on the center line is the second stator pole. The stator poles on both sides are narrower, and the stator pole in the middle is wider, that is, the width of the first stator pole is smaller than the width of the second stator pole; the pole arcs of the stator poles on both sides of the second stator block 30 are equal and equal to half of the pole arc of the middle stator pole, that is, the pole arc of the first stator pole is equal to half of the pole arc of the second stator pole.

[0060] Furthermore, the suspension winding coil 32 is only wound on the middle stator pole of the second stator block 30 , that is, wound on the second stator pole, and the suspension winding coil 32 alone constitutes one phase.

[0061] like Figure 6 and Figure 7 As shown, the dual-stator bearingless switched reluctance motor of the present application does not include permanent magnets. Compared with motors containing permanent magnets, this structure has obvious advantages in harsh environments such as large temperature changes, large vibration and noise, which can easily cause demagnetization of permanent magnets.

[0062] like Figure 8As shown, the rotor 2 is aligned with the excitation pole 10 where the torque winding coils I4a and IV4d are located. The torque winding coils I4a and IV4d are connected in series to form a single phase. When power is supplied to the torque winding coils I4a and IV4d, the magnetic flux they generate originates from the excitation pole 10 where they are located, passes through the air gap, and passes through the rotor block 20 and the auxiliary pole 11 to form a closed loop. This short magnetic flux path effectively reduces leakage flux, thereby improving magnetic flux utilization and lowering magnetomotive force requirements. At the same time, due to the action of the rotor magnetic isolation ring 21, the magnetic flux generated by the torque winding coils I4a and IV4d does not enter the annular core 22 and the second stator 3. Furthermore, when the torque winding coils switch from one phase to another, there is no reverse magnetic flux in the first stator 1, which helps reduce core losses and improve motor efficiency.

[0063] like Figure 9 As shown, the rotor 2 is in a balanced position. If the suspended winding coil 32 on the second stator block 30 is energized, the magnetic flux generated therefrom starts from one stator pole of the second stator block 30, passes through the air gap, the annular core 22 and the other stator pole of the second stator block 30, and forms a closed loop.

[0064] like Figure 10 As shown, the rotor 2 is in a balanced position. If the suspension winding coil 32 on the second stator block 30 is energized, the magnetic flux generated by it starts from the stator pole where the suspension winding coil 32 is located, passes through the air gap, the annular core 22 and the stator poles on both sides of the second stator block 30 to form a closed loop.

[0065] like Figure 9 and Figure 10 As shown, regardless of whether the second stator block 30 adopts a "C"-shaped structure or an "E"-shaped structure, the closed path of the magnetic flux generated by the suspension winding coil 32 is shorter, which can effectively reduce the leakage magnetic flux. Moreover, due to the action of the rotor magnetic isolation ring 21 and the second stator magnetic isolation ring 31, the magnetic flux generated by the suspension winding coil 32 will not enter the rotor block 20 and the first stator 1, nor will it enter the adjacent second stator block 30.

[0066] Furthermore, the first stator 1, the rotor block 20, the annular core 22 and the second stator block 30 are all made of electrical thin steel plates with good magnetic conductivity, such as electrical pure iron, electrical silicon steel sheets DW350, DR470, DR510, 35PN440, 35PN210 and M19, and are stamped and laminated.

[0067] The rotor magnetic isolation ring 21 and the second stator magnetic isolation ring 31 are both made of non-magnetic materials, such as aluminum, steel, titanium alloy, etc.

[0068] The torque winding coil I4a, torque winding coil II4b, torque winding coil III4c, torque winding coil IV4d, torque winding coil V4e, torque winding coil VI4f and suspension winding coil 32 are all made of copper wire with good conductive properties, which is then dipped in paint and dried.

[0069] In this application, the second stator 3 is located inside the first stator 1, and the rotor 2 rotates between the first stator 1 and the second stator 3. Due to the action of the rotor magnetic isolation ring 32, the magnetic flux generated by the torque winding coil 4 does not enter the annular core 22 and the second stator 3, and the magnetic flux generated by the suspension winding coil 32 does not enter the rotor block 20 and the first stator 1. Therefore, the magnetic flux generated by the torque winding coil 4 and the magnetic flux generated by the suspension winding coil 32 are independent of each other, achieving a natural decoupling of torque and suspension force control. By forming a closed loop between the excitation pole 10 and the auxiliary pole 11 in the first stator 1 and the rotor block 20 of the rotor 2, the magnetic flux path is short, which can effectively reduce leakage flux, improve magnetic flux utilization, and thus reduce magnetomotive force requirements. In addition, this structure eliminates the reverse magnetic flux in the first stator during torque winding commutation, reduces the core loss of the motor, and thus improves the power density and efficiency of the motor. The "C"-shaped or "E"-shaped structure of the second stator 3 forms a closed loop with the annular core 22 of the rotor 2. The magnetic flux generated by the suspension winding coil 32 has a shorter closed path. Furthermore, due to the action of the second stator magnetic isolation ring 31, the magnetic flux generated by the suspension winding coil 32 does not enter the adjacent second stator block 30, eliminating the magnetic flux coupling between suspension poles in different directions. Furthermore, because the rotor 2 adopts a cylindrical structure, its inner surface is smooth and free of protrusions, ensuring that the motor can generate a stable suspension force at any rotor rotational position. This solves the problems of conventional bearingless switched reluctance motors, such as the mutual coupling of torque and suspension force control, the mutual coupling of magnetic flux generated by suspension poles in different directions, and the low suspension force generated at some rotor positions, which in turn lead to complex control circuits, high control costs, and difficult control algorithms.

[0070] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

Claims

1. A dual-stator bearingless switched reluctance motor, characterized in that: The invention comprises a first stator (1), a rotor (2) and a second stator (3), wherein the second stator (3) is embedded in the inner side of the first stator (1), the rotor (2) is located between the first stator (1) and the second stator (3), and air gaps are provided between the first stator (1) and the rotor (2) and between the rotor (2) and the second stator (3), so that the rotor (2) can rotate between the first stator (1) and the second stator (3); The first stator (1) adopts a hybrid stator pole structure; The rotor (2) adopts a cylindrical structure; The second stator (3) adopts a salient pole structure, comprising a second stator block (30), a second stator magnetic isolation ring (31) and a suspension winding coil (32), wherein the suspension winding coil (32) is wound on the second stator block (30), and the second stator block (30) is uniformly embedded in the second stator magnetic isolation ring (31) along the circumferential direction outside the second stator magnetic isolation ring (31); According to the shape structure of the second stator block (30), the structure of the second stator block (30) is divided into a "C"-shaped structure and an "E"-shaped structure; The salient pole structure of the second stator (3) is a "C"-shaped structure, wherein the second stator block (30) is in a "C" shape, and the second stator block (30) has two stator poles, and the pole arcs of the two stator poles are equal; The suspension winding coils (32) are respectively wound on the two stator poles of the second stator block (30), wherein the winding directions of the suspension winding coils (32) on the two stator poles are opposite, and they are connected in series to form one phase; The second stator block (30) is in an "E" shape, and has three stator poles, wherein the stator poles located on both sides of the center line of the second stator block (30) are first stator poles, and the stator pole located on the center line is a second stator pole; The width of the first stator pole is smaller than the width of the second stator pole, and the pole arc of the first stator pole is equal to half of the pole arc of the second stator pole; The suspension winding coil (32) is wound only on the second stator pole of the second stator block (30), and the suspension winding coil (32) alone constitutes one phase.

2. The dual-stator bearingless switched reluctance motor according to claim 1, characterized in that: The rotor (2) adopts a cylindrical structure, which includes a rotor block (20), a rotor magnetic isolation ring (21) and an annular iron core (22). The number of the rotor blocks (20) is eight. The rotor blocks (20) are evenly and equidistantly embedded on the outer side of the rotor magnetic isolation ring (21) along the circumferential direction of the rotor magnetic isolation ring (21). The annular iron core (22) is embedded on the inner side of the rotor magnetic isolation ring (21), so that the rotor magnetic isolation ring (21) separates the magnetic flux flowing between the rotor (2) and the first stator (1) and the magnetic flux flowing between the rotor (2) and the second stator (3). The rotor blocks (20) are fan-shaped, the eight rotor blocks (20) are the same in size and shape, and the inner and outer surfaces of the rotor (2) are smooth.

3. The dual-stator bearingless switched reluctance motor according to claim 1, characterized in that: The number of the second stator blocks (30) is four, and the four second stator blocks (30) are evenly distributed along the circumferential direction outside the second stator magnetic isolation ring (31) and embedded in the second stator magnetic isolation ring (31).

4. The dual-stator bearingless switched reluctance motor according to claim 1, characterized in that: The suspension winding coils (32) have the same number of turns and are all centralized windings.

5. The dual-stator bearingless switched reluctance motor according to claim 1, characterized in that: The first stator (1) adopts a hybrid stator pole structure, the hybrid stator pole structure includes an excitation pole (10) and an auxiliary pole (11), the excitation pole (10) and the auxiliary pole (11) are formed by extending inwardly from the inner wall of the first stator (1) in a radial direction, wherein the number of the excitation poles (10) and the number of the auxiliary poles (11) are both six, and the size and shape are the same; The six excitation poles (10) and the six auxiliary poles (11) are all arranged on the inner side of the first stator (1) at equal intervals along the circumferential direction of the first stator (1), wherein the pole arc width of the excitation pole (10) is greater than twice the pole arc width of the auxiliary pole (11).

6. The dual-stator bearingless switched reluctance motor according to claim 5, characterized in that: The six excitation poles (10) are respectively wound with a torque winding coil I (4a), a torque winding coil II (4b), a torque winding coil III (4c), a torque winding coil IV (4d), a torque winding coil V (4e) and a torque winding coil VI (4f), and the winding directions of all the torque winding coils (4) are consistent, wherein the number of turns of the torque winding coils (4) is the same and all are centralized windings.

7. The dual-stator bearingless switched reluctance motor according to claim 6, characterized in that: The torque winding coils (4) on the two excitation poles (10) arranged opposite to each other on the diameter of the first stator (1) are connected to form one phase.

8. The dual-stator bearingless switched reluctance motor according to claim 1, characterized in that: The first stator (1), the rotor block (20), the annular core (22), and the second stator block (30) are all made of materials having magnetic conductivity; The rotor magnetic isolation ring (21) and the second stator magnetic isolation ring (31) are both made of materials that do not have magnetic conductivity. The torque winding coil I (4a), the torque winding coil II (4b), the torque winding coil III (4c), the torque winding coil IV (4d), the torque winding coil V (4e), the torque winding coil VI (4f) and the suspension winding coil (32) are all made of conductive copper wire.

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