A hybrid excitation bearingless switched reluctance motor

Abstract

The present application provides a hybrid excitation 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 an air gap is 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. The first stator adopts a hybrid stator pole structure, the rotor adopts a cylindrical structure, and the second stator adopts a salient pole structure, including eight salient poles and four permanent magnet blocks, wherein the permanent magnet blocks are arranged inside the second stator core. The present application solves the problems of the conventional bearingless switched reluctance motor in which the torque and suspension force control are mutually coupled, the magnetic flux generated by suspension force poles in different directions are mutually coupled, and an excitation current is passed into the winding to generate a bias magnetic field, resulting in a decrease in the torque and suspension force control performance of the motor, an increase in the control difficulty, and a decrease in efficiency.

Description

Technical Field

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

[0002] With the rapid development of power electronics technology, switched reluctance motors (SRMs) and their speed control systems have gained widespread application. Due to their simple structure, lack of rotor windings, high mechanical strength, and wide speed range, SRMs are particularly suitable for high- and ultra-high-speed operation. However, traditional SRMs utilize mechanical bearings to support their rotors. High-speed operation can lead to increased wear and heat generation, significantly shortening the bearing lifespan and reducing the reliability of the motor system.

[0003] The bearingless switched reluctance motor (SRM) combines the advantages of a SRM with bearingless technology. While retaining the advantages of a SRM, such as simple structure, low cost, and strong fault tolerance, it also offers the excellent characteristics of a bearingless motor, such as long service life and high output power. This makes it a promising candidate for high-speed drives. However, the torque and suspension force control of a conventional bearingless SRM are coupled, and the magnetic flux generated by suspension poles in different directions is coupled. This not only affects the motor's torque and suspension force control performance but also significantly increases the difficulty of controlling the motor. Furthermore, to generate the required suspension force, conventional bearingless SRMs require an excitation current to generate a bias magnetic field through the windings, which increases motor losses and reduces efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a hybrid excitation bearingless switched reluctance motor, which can solve the problems of the existing traditional bearingless switched reluctance motor in which the torque and suspension force control are coupled with each other, the magnetic flux generated by the suspension force poles in different directions are coupled with each other, and the excitation current is passed into the winding to generate a bias magnetic field, resulting in a decrease in the torque and suspension force control performance of the motor, an increase in control difficulty, and a decrease in efficiency.

[0005] To solve the above problems, the present application provides a hybrid excitation 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, wherein the salient pole structure includes a permanent magnet block, a second stator core and a suspension winding coil, the suspension winding coil is wound on the salient pole of the second stator core, and the permanent magnet block is arranged inside the second stator core;

[0009] Optionally, the rotor adopts a cylindrical structure, which includes rotor blocks, a rotor magnetic isolation ring and an annular iron core. The number of rotor blocks is eight, and the rotor blocks are evenly and equidistantly embedded on the outer side of the rotor magnetic isolation ring along the circumferential direction of the rotor magnetic isolation ring, and the annular iron core is embedded on 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;

[0010] 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.

[0011] Optionally, the number of permanent magnet blocks is four, the permanent magnet blocks are identical in size and shape, the second stator is provided with eight salient poles, and the eight salient poles are identical in size and shape; four permanent magnet blocks are embedded in the interior of the second stator core, the four permanent magnet blocks are orthogonally distributed in the circumferential direction inside the second stator core, and each permanent magnet block is located on the center line between two salient poles, the four permanent magnet blocks are circumferentially magnetized, and the magnetization directions of two axially symmetric permanent magnet blocks are the same, and the magnetization directions of two adjacent permanent magnet blocks are opposite;

[0012] A magnetic isolation bridge is provided at the center line position between two adjacent permanent magnet blocks, and the suspension winding coils on the salient poles of the second stator core between the two adjacent magnetic isolation bridges are connected to form one phase.

[0013] Optionally, the suspension winding coils have the same number of turns and are all concentrated windings.

[0014] 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;

[0015] 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.

[0016] Optionally, torque winding coil I, torque winding coil II, torque winding coil III, torque winding coil IV, torque winding coil V and torque winding coil VI are respectively wound on the six excitation poles, and the winding directions of all torque winding coils are consistent, wherein the number of turns of the torque winding coils is the same and they are all centralized windings.

[0017] 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.

[0018] Optionally, the first stator, rotor block, annular core and second stator core are all made of materials with magnetic conductivity;

[0019] The rotor magnetic isolation ring is made of a material that does not have magnetic conductivity;

[0020] The torque winding coil I, torque winding coil II, torque winding coil III, torque winding coil IV, torque winding coil V, torque winding coil VI and suspension winding coil are all made of conductive copper wire.

[0021] The permanent magnet block is made of a material having a residual magnetic density.

[0022] Beneficial effects

[0023] A hybrid excitation bearingless switched reluctance motor provided in an embodiment of the present invention includes a first stator, a rotor and a second stator. The eight rotor blocks and the annular iron core on the rotor constitute an outer unit motor and an inner unit motor with the first stator and the second stator respectively, and are further combined with a rotor magnetic isolation ring and a magnetic isolation bridge. Compared with the traditional bearingless switched reluctance motor, the hybrid excitation bearingless switched reluctance motor of the present application completely separates the magnetic flux generated by the torque winding coil and the suspension winding coil, and separates the magnetic flux generated by the suspension force poles in different directions, thereby realizing the natural decoupling of the torque and suspension force control, and realizing the natural decoupling of the suspension force control in different directions, thereby reducing the control difficulty of the motor and improving the torque and suspension force control performance of the motor. In addition, the outer unit motor of the present application adopts a segmented rotor and hybrid stator pole structure, which shortens the magnetic flux path, improves the magnetic flux utilization and eliminates the reverse magnetic flux in the stator when the torque winding current is commutated, thereby improving the output torque of the motor and reducing the core loss of the motor. At the same time, the inner unit motor of the present application adopts a permanent magnet block to provide a bias magnetic field, which reduces the operating loss of the motor. Therefore, the hybrid excitation bearingless switched reluctance motor of the present application can improve the operating efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a hybrid excitation bearingless switched reluctance motor according to an embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of a first stator according to an embodiment of the present application;

[0026] Figure 3 This is a schematic structural diagram of a rotor according to an embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of a second stator according to an embodiment of the present application;

[0028] Figure 5 This is a schematic structural diagram of the overall assembly state of the hybrid excitation bearingless switched reluctance motor according to an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the magnetic flux path for powering the torque winding coil of an embodiment of the present application;

[0030] Figure 7 Schematic diagram of the magnetic flux path for powering the suspended winding coil according to an embodiment of the present application.

[0031] The reference numerals indicate:

[0032] 1. First stator; 10. Excitation pole; 11. Auxiliary pole;

[0033] 2. Rotor; 20. Rotor block; 21. Rotor magnetic isolation ring; 22. Ring core;

[0034] 3. Second stator; 30. Permanent magnet block; 31. Second stator core; 32. Suspension winding coil;

[0035] 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;

[0036] 5. Magnetic isolation bridge. DETAILED DESCRIPTION

[0037] See also Figures 1 to 7 As shown, according to an embodiment of the present application, a hybrid excitation bearingless switched reluctance motor 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, and the rotor 2 is located between the first stator 1 and the second stator 3. 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.

[0038] The first stator 1 adopts a hybrid stator pole structure, which includes an excitation pole 10 and an auxiliary pole 11. The excitation pole 10 and the auxiliary pole 11 are formed by extending radially inward from the inner wall of the first stator 1.

[0039] The rotor 2 has 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 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. Thus, the rotor magnetic isolation ring 21 separates the magnetic flux flowing between the rotor 2 and the first stator 1 from the magnetic flux flowing between the rotor 2 and the second stator 3.

[0040] The second stator 3 adopts a salient pole structure, wherein the salient pole structure includes a permanent magnet block 30, a second stator core 31 and a suspension winding coil 32. The suspension winding coil 32 is wound on the salient poles of the second stator core 31, and the permanent magnet block 30 is embedded in the second stator core 31.

[0041] The second stator 3 is embedded in the first stator 1, and the rotor 2 is arranged between the first stator 1 and the second stator 3, and the rotor 2 rotates between the first stator 1 and the second stator 3. The eight rotor blocks 20 and the annular iron core 22 on the rotor 2 and the first stator 1 and the second stator 3 respectively constitute the outer unit motor and the inner unit motor, and the rotor magnetic isolation ring 21 and the magnetic isolation bridge 5 cooperate. Compared with the traditional bearingless switched reluctance motor, the hybrid excitation bearingless switched reluctance motor completely separates the magnetic flux generated by the torque winding coil 4 and the suspension winding coil 32, and separates the magnetic flux generated by the suspension force poles in different directions, thereby realizing the natural decoupling of torque and suspension force control, and realizing the natural decoupling of suspension force control in different directions, thereby reducing the control difficulty of the motor and improving the torque and suspension force control performance of the motor. In addition, the outer unit motor of the hybrid excitation bearingless switched reluctance motor adopts a block rotor and hybrid stator pole structure, which shortens the magnetic flux path, improves the magnetic flux utilization and eliminates the reverse magnetic flux in the stator when the current of the torque winding coil 4 is commutated, thereby improving the output torque of the motor and reducing the core loss of the motor; at the same time, the inner unit motor of the hybrid excitation bearingless switched reluctance motor adopts a permanent magnet block 30 to provide a bias magnetic field, which reduces the operating loss of the motor. Therefore, the hybrid excitation bearingless switched reluctance motor can improve the operating efficiency of the motor.

[0042] 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.

[0043] like Figure 2 and Figure 5As shown, the first stator 1 adopts a hybrid stator pole structure, including six excitation poles 10 of the same shape and size and six auxiliary poles 11 of the same shape and size. These are distributed circumferentially and evenly spaced on the inner side of the first stator 1. The pole arc width of the excitation pole 10 is greater than twice the pole arc width of the auxiliary pole 11.

[0044] Furthermore, the torque winding coils I4a, II4b, III4c, IV4d, V4e, and VI4f are each wound around the six excitation poles 10 in a concentrated winding configuration to generate rotational torque. The torque winding coils 4 on all excitation poles 10 have the same number of turns and are wound in the same direction. Furthermore, the torque winding coils 4 on two diametrically opposed excitation poles 10 of the first stator 1 are connected to form a single phase. For example, the torque winding coils I4a and IV4d are connected to form a single phase, the torque winding coils II4b and V4e are connected to form a single phase, and the torque winding coils III4c and VI4f are connected to form a single phase.

[0045] Furthermore, the auxiliary poles 11 are neither wound with the winding coil 4 nor contain permanent magnets. They only provide a circuit for the magnetic flux generated by the torque winding coil 4 .

[0046] like Figure 3 and Figure 5 As shown, the rotor 2 adopts a cylindrical structure and includes eight rotor blocks 20 of the same shape and size, a rotor magnetic isolation ring 21 and an annular iron core 22. The eight rotor blocks 20 are embedded in the outer side of the rotor magnetic isolation ring 21 at equal intervals, and the annular iron core 22 is embedded in the inner side of the rotor magnetic isolation ring 21. The rotor magnetic isolation ring 21 not only fixes the rotor blocks 20 and the annular iron 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 a natural decoupling of torque and suspension force control, thereby reducing the control difficulty of the motor and improving the control performance of the motor torque and suspension force. In addition, the inner and outer surfaces of the rotor 2 are smooth and without any protrusions, so that the rotor can generate a stable suspension force at any rotational position, which can further improve the suspension force control performance. At the same time, when the motor rotates at high speed, the structure of the rotor 2 is conducive to reducing wind friction loss and improving the working efficiency of the motor.

[0047] Furthermore, the use of eight rotor blocks 20 in rotor 2 enables the motor to operate at a lower frequency, resulting in less core loss during high-speed operation and improved overall motor system efficiency. Furthermore, the use of eight rotor blocks 20 in rotor 2 prevents the torque waveforms generated by adjacent rotor blocks 20 overlapping the same excitation pole 10 from being inconsistent and overlapping, thereby reducing torque ripple in the motor.

[0048] like Figure 4 and Figure 5 As shown, the second stator 3 adopts a salient pole structure, including a permanent magnet block 30 , a second stator core 31 and a suspension winding coil 32 .

[0049] Furthermore, the number of the permanent magnet blocks 30 is four, the size and shape of the permanent magnet blocks 30 are the same, and the second stator 3 is provided with eight magnetic poles.

[0050] Furthermore, the eight salient poles on the second stator core 31 are evenly distributed on the outside of the second stator core 31. The eight salient poles are equal in size and shape. Each salient pole is wound with a suspension winding coil 32 with the same number of turns for controlling the suspension force, and the winding direction on each salient pole is the same.

[0051] Furthermore, four permanent magnet blocks 30 of the same shape and size are embedded in the interior of the second stator core 31 to provide a bias magnetic field. The four permanent magnet blocks 30 are orthogonally distributed along the circumferential direction inside the second stator core 31, and each permanent magnet block 30 is located on the center line between two salient poles. The four permanent magnet blocks 30 are circumferentially magnetized, and the magnetization directions of the two axially symmetrical permanent magnet blocks 30 are the same, and the magnetization directions of the two adjacent permanent magnet blocks 30 are opposite. A magnetic isolation bridge 5 is provided at the center line position between the two adjacent permanent magnet blocks 30 to separate the magnetic fields generated by the two permanent magnet blocks 30. In addition, the suspended winding coils 32 on the salient poles of the second stator core 31 between the two adjacent magnetic isolation bridges 5 are connected to form one phase.

[0052] Furthermore, the permanent magnet block 30 is used to replace the excitation current in the traditional bearingless switched reluctance motor to generate the bias magnetic field, which can effectively reduce the copper loss of the motor and thus improve the working efficiency of the entire motor system.

[0053] like Figure 6 As shown, the torque winding coil I4a and the torque winding coil IV4d are connected to form one phase. When power is supplied to the torque winding coil I4a and the torque winding coil IV4d, the magnetic flux they generate starts 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 can effectively reduce leakage flux, improve magnetic flux utilization, and thus increase the output torque of the motor. At the same time, due to the action of the rotor magnetic isolation ring 21, the magnetic flux generated by the torque winding coil I4a and the torque winding coil IV4d will not enter the annular core 22 and the second stator 3. In addition, when the torque winding current is switched from one phase to another, there is no reverse magnetic flux in the first stator 1, which helps to reduce core loss and further improve motor efficiency.

[0054] like Figure 7As shown, the rotor 2 is in an equilibrium position. When the suspension winding coil 32 is not energized, the magnetic flux generated by the permanent magnet block 30 starts from the permanent magnet block 30, passes through a salient pole of the second stator core 31, crosses the air gap, passes through the annular core 22 and the adjacent salient pole of the second stator core 31, and forms a closed loop, as shown by the long dashed line in the figure. At this time, the magnetic field in the motor air gap is evenly and symmetrically distributed, and the motor does not generate a suspension force. When the suspension winding coil 32 is energized, the magnetic flux it generates is shown by the dotted dashed line in the figure. The magnetic flux generated by the suspension winding coil 32 interacts with the magnetic flux generated by the permanent magnet block 30, making the magnetic field distribution in the motor air gap asymmetric, thereby generating a suspension force. Therefore, by controlling the magnitude and direction of the current in different suspension winding coils 32, the required suspension force can be generated.

[0055] Further, such as Figure 7 As shown, due to the action of the rotor magnetic isolation ring 21 and the magnetic isolation bridge 5, the magnetic flux generated by the permanent magnet block 30 and the suspension winding coil 32 will not enter the rotor block 20 and the first stator 1, nor will it enter the adjacent suspension poles, thereby eliminating the magnetic flux coupling between suspension poles in different directions in the traditional bearingless switched reluctance motor, thereby reducing the difficulty of controlling the motor suspension force.

[0056] Furthermore, the first stator 1, the rotor block 20, the annular core 22 and the second stator core 31 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.

[0057] The rotor magnetic isolation ring 21 is made of non-magnetic materials, such as aluminum, steel, titanium alloy, etc.

[0058] The torque winding coils I4a, II4b, III4c, IV4d, V4e, VI4f, and the suspension winding coil 32 are all made of copper wire with good electrical conductivity, which is then dipped in varnish and dried.

[0059] The permanent magnet block 30 is made of a material such as neodymium iron boron (NdFeB), samarium cobalt (SmCo), or aluminum nickel cobalt (AlNiCo) permanent magnet with a relatively high remanence density.

[0060] The hybrid excitation bearingless switched reluctance motor of the present application includes a first stator 1, a rotor 2 and a second stator 3. The eight rotor blocks 20 and the annular iron core 22 on the rotor 2 constitute the outer unit motor and the inner unit motor respectively with the first stator 1 and the second stator 3, and are combined with the rotor magnetic isolation ring 21 and the magnetic isolation bridge 5. Compared with the traditional bearingless switched reluctance motor, the motor completely separates the magnetic flux generated by the torque winding coil 4 and the suspension winding coil 32, and separates the magnetic flux generated by the suspension force poles in different directions, thereby realizing the natural decoupling of the torque and suspension force control, and realizing the natural decoupling of the suspension force control in different directions, thereby reducing the control difficulty of the motor and improving the torque and suspension force control performance of the motor. In addition, the outer unit motor described in the present application adopts a segmented rotor and hybrid stator pole structure, which shortens the magnetic flux path, improves the magnetic flux utilization and eliminates the reverse magnetic flux in the stator when the current of the torque winding coil 4 is commutated, thereby improving the output torque of the motor and reducing the core loss of the motor; at the same time, the inner unit motor described in the present application adopts a permanent magnet block 30 to provide a bias magnetic field, which reduces the operating loss of the motor. Therefore, the hybrid excitation bearingless switched reluctance motor of the present application can improve the operating efficiency of the motor.

[0061] 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 hybrid excitation 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, wherein the salient pole structure includes a permanent magnet block (30), a second stator core (31) and a suspension winding coil (32), the suspension winding coil (32) is wound on the salient pole of the second stator core (31), and the permanent magnet block (30) is arranged inside the second stator core (31); Four permanent magnet blocks (30) are embedded in the interior of the second stator core (31), and the four permanent magnet blocks (30) are orthogonally distributed along the circumferential direction inside the second stator core (31), and each permanent magnet block (30) is located on the center line between two salient poles. The four permanent magnet blocks (30) are circumferentially magnetized, and the magnetization directions of two axially symmetrical permanent magnet blocks (30) are the same, and the magnetization directions of two adjacent permanent magnet blocks (30) are opposite; a magnetic isolation bridge (5) is provided at the center line position between two adjacent permanent magnet blocks (30), and the suspended winding coils (32) on the salient poles of the second stator core (31) between the two adjacent magnetic isolation bridges (5) are connected to form one phase; The first stator (1) adopts a hybrid stator pole structure, which includes an excitation pole (10) and an auxiliary pole (11), and 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 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); 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); the torque winding coil (4) includes: 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 concentrated windings.

2. The hybrid excitation 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 in 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 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). The rotor block (20) is fan-shaped, the eight rotor blocks (20) are all the same in size and shape, and the inner and outer surfaces of the rotor (2) are both smooth.

3. The hybrid excitation bearingless switched reluctance motor according to claim 1, characterized in that: The number of the permanent magnet blocks (30) is four, and the permanent magnet blocks (30) are all the same in size and shape. The second stator (3) is provided with eight salient poles, and the eight salient poles provided on the second stator core (31) are all the same in size and shape.

4. The hybrid excitation 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 hybrid excitation bearingless switched reluctance motor according to claim 1, 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.

6. The hybrid excitation 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 core (31) are all made of materials having magnetic conductivity; The rotor magnetic isolation ring (21) is made of a material that does 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. The permanent magnet block (30) is made of a material having a residual magnetic density.

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