CN115224903A - A hybrid excitation bearingless switched reluctance motor - Google Patents

Abstract

The application provides a mix excitation formula bearingless switched reluctance motor, including first stator, rotor and second stator, the inboard of first stator of second stator embedding, the rotor is located between first stator and the second stator, all be provided with the air gap between first stator and the rotor and between rotor and the second stator to make the rotor rotate between first stator and second stator, first stator adopts mixed stator pole structure, the rotor adopts cylindrical structure, the second stator adopts salient pole structure, including eight salient poles and four permanent magnet blocks, wherein the permanent magnet block sets up inside second stator core. The problems that the torque and the suspension force control performance of a traditional bearingless switched reluctance motor are reduced, the control difficulty is increased, and the efficiency is reduced due to the fact that magnetic fluxes generated by suspension force poles in different directions are mutually coupled and exciting currents are introduced into windings to generate a bias magnetic field are solved.

Description

A hybrid excitation bearingless switched reluctance motor

technical field

The application belongs to the technical field of motors, and in particular relates to a hybrid excitation type bearingless switched reluctance motor.

Background technique

With the rapid development of power electronics technology, switched reluctance motors and their speed control systems have been widely used. Due to the advantages of simple structure, no rotor winding, high mechanical strength, and wide speed regulation range, switched reluctance motors are especially suitable for high-speed and ultra-high-speed operation. However, the rotor of the traditional switched reluctance motor is supported by mechanical bearings. High-speed operation will increase the wear and heat of the mechanical bearings, which will greatly reduce the life of the mechanical bearings and reduce the reliability of the motor system.

The bearingless switched reluctance motor combines the switched reluctance motor and the bearingless technology, which not only retains the advantages of the switched reluctance motor, such as simple structure, low cost, and strong fault tolerance, but also has the long service life and high output power of the bearingless motor. With excellent characteristics, it has broad application prospects in the field of high-speed drives. However, the torque and levitation force control of the traditional bearingless switched reluctance motor are coupled with each other, and the magnetic fluxes generated by the levitation force poles in different directions are coupled with each other, which not only affects the torque and levitation force control performance of the motor, but also greatly increases the Difficulty in controlling the motor. At the same time, in order to generate the required levitation force, the traditional bearingless switched reluctance motor needs to pass an excitation current into the winding to generate a bias magnetic field, which leads to an increase in the loss of the motor and a decrease in the efficiency.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present application is to provide a hybrid excitation type bearingless switched reluctance motor, which can solve the problem that the torque and the suspension force control of the existing traditional bearingless switched reluctance motor are coupled with each other and the suspension force poles in different directions are The generated magnetic fluxes are coupled with each other, and the excitation current is passed into the windings to generate a bias magnetic field, which leads to the problems of reduced torque and suspension force control performance of the motor, increased control difficulty, and reduced efficiency.

In order to solve the above problems, the present application provides a hybrid excitation type bearingless switched reluctance motor, which includes a first stator, a rotor and a second stator, the second stator is embedded inside the first stator, and the rotor is located in the first stator. Air gaps are arranged between the stator and the second stator, between the first stator and the rotor, and between the rotor and the second stator, so that the rotor rotates between the first stator and the second stator;

The first stator adopts a hybrid stator pole structure;

The rotor adopts a cylindrical structure;

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 on the second stator core. Inside the stator core;

Optionally, the rotor adopts a cylindrical structure, and the cylindrical structure includes a rotor block, a rotor magnetic isolation ring and an annular iron core, the number of rotor blocks is eight, and the rotor blocks are along the circumferential direction of the rotor magnetic isolation ring. It is embedded in the outer side of the rotor magnetic isolation ring evenly and at equal intervals, and the annular iron core is embedded in the inner side of the rotor magnetic isolation ring, so that the rotor magnetic isolation ring can transfer the magnetic flux circulating between the rotor and the first stator and the gap between the rotor and the second stator. The magnetic flux circulating between them is separated;

Among them, the shape of the rotor block is sector-shaped, the size and shape of the eight rotor blocks are the same, and the inner and outer surfaces of the rotors are smooth.

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

A magnetic isolation bridge is arranged on the centerline between two adjacent permanent magnet blocks, and the suspension winding coils on the salient poles of the second stator iron core between the two adjacent magnetic isolation bridges are connected to form a phase.

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

Optionally, the first stator adopts a hybrid stator pole structure, and the hybrid stator pole structure includes an excitation pole and an auxiliary pole, and the excitation pole and the auxiliary pole are both formed by the inner wall of the first stator extending inward in the radial direction, wherein , the number of excitation poles and auxiliary poles are both six, and the size and shape are the same;

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

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 the torque winding coils are the same, wherein the number of turns of the torque winding coils is the same, and they are all concentrated windings.

Optionally, the torque winding coils on the two excitation poles disposed diametrically opposite to each other in the first stator are connected to form a phase.

Optionally, the first stator, the rotor block, the annular iron core and the second stator iron core are made of materials with magnetic conductivity;

The rotor magnetic isolation ring is made of materials that do not have magnetic conductivity;

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 made of copper wire with electrical conductivity ;

The permanent magnet blocks are made of permanent magnets with remanence density.

beneficial effect

A hybrid excitation type bearingless switched reluctance motor provided in an embodiment of the present invention includes a first stator, a rotor and a second stator, eight rotor blocks and an annular iron core on the rotor and the first stator and the second stator. The second stator constitutes the outer unit motor and the inner unit motor respectively, and is combined with the rotor magnetic isolation ring and the magnetic isolation bridge. Compared with the traditional bearingless switched reluctance motor, the hybrid excitation type bearingless switched reluctance motor of the present application will The magnetic flux generated by the torque winding coil and the suspension winding coil is completely separated, and the magnetic flux generated by the suspension force poles in different directions is separated, which realizes the natural decoupling of torque and suspension force control, and realizes suspension in different directions. The natural decoupling of force control reduces the control difficulty of the motor and improves 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 a hybrid stator pole structure, which shortens the magnetic flux path, improves the magnetic flux utilization rate, and eliminates the reverse magnetic flux in the stator when the torque winding current is commutated, thereby improving the The output torque of the motor and the loss of the iron core of the motor are reduced. At the same time, the internal unit motor of the present application uses a permanent magnet block to provide a bias magnetic field, which reduces the running loss of the motor. Therefore, the hybrid excitation type bearingless switched reluctance motor of the present application It can improve the operating efficiency of the motor.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of a hybrid excitation type bearingless switched reluctance motor according to an embodiment of the application;

2 is a schematic structural diagram of a first stator according to an embodiment of the application;

3 is a schematic structural diagram of a rotor according to an embodiment of the application;

4 is a schematic structural diagram of a second stator according to an embodiment of the application;

FIG. 5 is a schematic structural diagram of the overall assembled state of the hybrid excitation type bearingless switched reluctance motor according to the embodiment of the application;

6 is a schematic diagram of a magnetic flux path for supplying power to a torque winding coil according to an embodiment of the application;

FIG. 7 is a schematic diagram of a magnetic flux path for supplying power to a suspension winding coil according to an embodiment of the present application.

Reference numerals are indicated as:

1. The first stator; 10. Excitation pole; 11. Auxiliary pole;

2. Rotor; 20. Rotor block; 21. Rotor magnetic isolation ring; 22. Ring iron core;

3. Second stator; 30. Permanent magnet block; 31. Second stator core; 32. Suspended winding coil;

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, turn Torque winding coil VI;

5. Magnetic isolation bridge.

Detailed ways

1 to 7 , according to an embodiment of the present application, a hybrid excitation type bearingless switched reluctance motor includes a first stator 1 , a rotor 2 and a second stator 3 , and the second stator 3 is embedded in the first stator 3 . Inside the 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 as to Make the rotor 2 rotate between the first stator 1 and the second stator 3;

The first stator 1 adopts a mixed stator pole structure, and the mixed stator pole structure includes an excitation pole 10 and an auxiliary pole 11, and the excitation pole 10 and the auxiliary pole 11 are both formed by the inner wall of the first stator 1 extending inward along the radial direction;

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 . The circumferential direction is uniformly embedded in the outer side 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 can circulate the air between the rotor 2 and the first stator 1. The magnetic flux and the magnetic flux circulating between the rotor 2 and the second stator 3 are separated;

The second stator 3 adopts a salient pole structure, wherein the salient pole structure includes a permanent magnet block 30, a second stator iron core 31 and a suspension winding coil 32. The suspension winding coil 32 is wound on the salient pole of the second stator iron core 31, and is permanently The magnet block 30 is embedded inside the second stator core 31;

The second stator 3 is embedded into 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 constitute the outer unit motor and the inner unit motor respectively, and the rotor magnetic isolation ring 21 and the magnetic isolation bridge 5 cooperate with each other. , 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 suspension force poles in different directions. The generated magnetic flux is separated, which realizes the natural decoupling of torque and suspension force control, and realizes 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 of the motor. Control performance. In addition, the outer unit motor of the hybrid excitation type bearingless switched reluctance motor adopts a block rotor and a hybrid stator pole structure, which shortens the magnetic flux path, improves the magnetic flux utilization rate and eliminates the torque winding coil 4 current commutation At the same time, the internal unit motor of the hybrid excitation bearingless switched reluctance motor adopts the permanent magnet block 30 to provide bias The magnetic field reduces the running loss of the motor, so the hybrid excitation type bearingless switched reluctance motor can improve the running efficiency of the motor.

Further, 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 between the first stator 1 and the rotor 2 and the rotor 2 An air gap is set between the second stator 3 and the air gap, wherein the air gap is an air gap of equal clearance, 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 .

As shown in FIG. 2 and FIG. 5 , 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, which are distributed at equal intervals along the circumferential direction Inside the first stator 1 . The pole arc width of the field pole 10 is greater than twice the pole arc width of the auxiliary pole 11 .

Further, the torque winding coil I4a, the torque winding coil II4b, the torque winding coil III4c, the torque winding coil IV4d, the torque winding coil V4e and the torque winding coil VI4f are respectively wound around the six excitation poles 10 in the form of concentrated winding. It is used to generate rotational torque, and the torque winding coils 4 on all excitation poles 10 have the same number of turns and the same winding direction. In addition, the torque winding coils 4 on the two excitation poles 10 disposed opposite to each other in the diameter of the first stator 1 are connected to form a phase. For example, the torque winding coil I4a and the torque winding coil IV4d are connected to form a phase. The coil II4b is connected to the torque winding coil V4e to form a phase, and the torque winding coil III4c is connected to the torque winding coil VI4f to form a phase.

Further, the auxiliary pole 11 neither winds the winding coil 4 nor contains permanent magnets, and they only provide a return path for the magnetic flux generated by the torque winding coil 4 .

As shown in FIG. 3 and FIG. 5 , the rotor 2 adopts a cylindrical structure, including eight rotor blocks 20 of the same shape and size, a rotor magnetic isolation ring 21 and an annular iron core 22 . 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 plays the role of fixing the rotor block 20 and the annular iron core 22, but also can separate the magnetic flux generated by the torque winding coil 4 and the magnetic flux generated by the suspension winding coil 32, thereby realizing torque and suspension. The natural decoupling of force control reduces the difficulty of motor control and improves the control performance of motor torque and suspension force. In addition, the inner and outer surfaces of the rotor 2 are smooth without any protrusions, so that the rotor can generate a stable levitation force at any rotational position, which can further improve the levitation force control performance. At the same time, when the motor rotates at a high speed, the structure of the rotor 2 is beneficial to reduce the wind friction loss and improve the working efficiency of the motor.

Further, the rotor 2 adopts eight rotor blocks 20, which enables the motor to have a lower operating frequency, thereby generating less iron core loss when the motor runs at a high speed, thereby improving the operating efficiency of the entire motor system. In addition, the use of eight rotor blocks 20 in the rotor 2 can make the torque waveforms generated by two adjacent rotor blocks 20 overlapping with the same excitation pole 10 inconsistent and overlapping each other, thereby helping to reduce the torque ripple of the motor.

As shown in FIG. 4 and FIG. 5 , the second stator 3 adopts a salient pole structure, including a permanent magnet block 30 , a second stator iron core 31 and a suspension winding coil 32 .

Further, 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.

Further, the eight salient poles on the second stator iron core 31 are evenly distributed on the outside of the second stator iron core 31, the eight salient poles are equal in size and shape, and each salient pole is wound with the same number of turns. The suspension winding coils 32 are used to control the suspension force, and they are wound in the same direction on each salient pole.

Further, four permanent magnet blocks 30 with the same shape and size are embedded inside the second stator iron core 31 to provide a bias magnetic field. Four permanent magnet blocks 30 are orthogonally distributed in the circumferential direction inside the second stator core 31 , and each permanent magnet block 30 is located on the center line between the two salient poles. The four permanent magnet blocks 30 are magnetized in the circumferential direction, and the magnetization directions of the two axially symmetric permanent magnet blocks 30 are the same, and the magnetization directions of the adjacent two permanent magnet blocks 30 are opposite. A magnetic isolation bridge 5 is provided on the centerline between two adjacent permanent magnet blocks 30 for separating the magnetic fields generated by the two permanent magnet blocks 30 . In addition, the suspension winding coils 32 on the salient poles of the second stator iron core 31 between two adjacent magnetic isolation bridges 5 are connected to form a phase.

Further, using the permanent magnet block 30 to replace the excitation current in the traditional bearingless switched reluctance motor to generate the bias magnetic field can effectively reduce the copper consumption of the motor, thereby improving the working efficiency of the entire motor system.

As shown in FIG. 6 , the torque winding coil I4a and the torque winding coil IV4d are connected to form a phase. When power is supplied to the torque winding coil I4a and the torque winding coil IV4d, the generated magnetic flux starts from the excitation pole 10 where they are located. , through the air gap, through the rotor block 20 and the auxiliary pole 11 to form a closed loop. The magnetic flux path is short, which can effectively reduce the leakage magnetic flux, improve the utilization rate of the magnetic flux, and then improve 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 iron 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 is beneficial to reduce core loss and further improve motor efficiency.

As shown in FIG. 7 , the rotor 2 is in a balanced 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, and passes through the permanent magnet block 30. The air gap forms a closed loop through the annular iron core 22 and the salient poles of the adjacent second stator iron core 31, as shown by the long dashed line in the figure. At this time, the magnetic field in the air gap of the motor is evenly and symmetrically distributed, and the motor does not generate a levitation force. . When the suspension winding coil 32 is energized, the magnetic flux generated by it is shown by the dotted 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 to make the distribution of the magnetic field in the air gap of the motor asymmetrical, thereby generating a suspension force. Therefore, the required levitation force can be generated by controlling the magnitude and direction of the current in the different suspension winding coils 32 .

Further, as shown in FIG. 7 , due to the action of the rotor magnetic isolation ring 21 and the magnetic isolation bridge 5 , the magnetic fluxes 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 . It will not enter the adjacent suspension force poles, which eliminates the magnetic flux coupling between the suspension force poles in different directions in the traditional bearingless switched reluctance motor, thereby reducing the difficulty of controlling the motor suspension force.

Further, the first stator 1, the rotor block 20, the annular iron core 22 and the second stator iron core 31 are made of electrical thin steel plates with good magnetic conductivity, such as electrical pure iron, electrical silicon steel sheets DW350, DR470, Magnetic materials such as DR510, 35PN440, 35PN210 and M19 are stamped and laminated;

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

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 with good electrical conductivity After the wire is wound, it is made by dipping and drying;

The permanent magnet block 30 is made of NdFeB, SmCo or AlNiCo permanent magnets with high remanence density.

The hybrid excitation type bearingless switched reluctance motor of the present application includes a first stator 1, a rotor 2 and a second stator 3, eight rotor blocks 20 and an annular iron core 22 on the rotor 2 and the first stator 1 and the second stator 3. The two stators 3 constitute the outer unit motor and the inner unit motor respectively, and together with the rotor magnetic isolation ring 21 and the magnetic isolation bridge 5, compared with the traditional bearingless switched reluctance motor, the motor combines the torque winding coil 4 with the suspension winding The magnetic flux generated by the coil 32 is completely separated, and the magnetic flux generated by the suspension force poles in different directions is separated, so as to realize the natural decoupling of the torque and suspension force control, and realize 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 a hybrid stator pole structure, which shortens the magnetic flux path, improves the magnetic flux utilization rate, and eliminates the reverse magnetic flux in the stator when the torque winding coil 4 current is commutated. , thereby improving the output torque of the motor and reducing the iron core loss of the motor; at the same time, the internal unit motor described in the present application adopts the permanent magnet block 30 to provide a bias magnetic field, which reduces the running loss of the motor, so the hybrid motor of the present application Excited bearingless switched reluctance motors can improve the operating efficiency of the motor.

Those skilled in the art can easily understand that, under the premise of no conflict, the above-mentioned advantageous manners can be combined and superimposed freely.

Claims (9)

1. A hybrid excitation type bearingless switched reluctance motor is characterized by comprising a first stator (1), a rotor (2) and a second stator (3), wherein the second stator (3) is embedded into the inner side of the first stator (1), the rotor (2) is positioned between the first stator (1) and the second stator (3), and air gaps are respectively arranged 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 mixed stator pole structure;

the rotor (2) adopts a cylindrical structure;

the second stator (3) adopts a salient pole structure, wherein the salient pole structure comprises 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).

2. The hybrid excitation bearingless switched reluctance motor according to claim 1, wherein the rotor (2) has a cylindrical structure including rotor blocks (20), rotor nonmagnetic rings (21), and annular cores (22), the number of the rotor blocks (20) being eight, the rotor blocks (20) being embedded at equal intervals in the circumferential direction of the rotor nonmagnetic rings (21) on the outer side of the rotor nonmagnetic rings (21), and the annular cores (22) being embedded on the inner side of the rotor nonmagnetic rings (21), so that the rotor nonmagnetic rings (21) separate the magnetic flux circulating between the rotor (2) and the first stator (1) and the magnetic flux circulating between the rotor (2) and the second stator (3);

the rotor blocks (20) are fan-shaped, the eight rotor blocks (20) are identical in size and shape, and the inner surface and the outer surface of the rotor (2) are smooth.

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

4. The hybrid excitation bearingless switched reluctance motor according to claim 1, wherein four permanent magnet blocks (30) are embedded inside the second stator core (31), the four permanent magnet blocks (30) are distributed inside the second stator core (31) orthogonally along a circumferential direction, each permanent magnet block (30) is located on a center line between two salient poles, the four permanent magnet blocks (30) are circumferentially magnetized, the magnetizing directions of two axially symmetric permanent magnet blocks (30) are the same, and the magnetizing directions of two adjacent permanent magnet blocks (30) are opposite;

and magnetic isolation bridges (5) are arranged on the central line position between two adjacent permanent magnet blocks (30), and suspension winding coils (32) on salient poles of the second stator iron core (31) between two adjacent magnetic isolation bridges (5) are connected to form one phase.

5. The hybrid excitation bearingless switched reluctance machine according to claim 1, wherein the levitation winding coils (32) have the same number of turns and are all concentrated windings.

6. The hybrid excitation bearingless switched reluctance motor according to claim 1, wherein the first stator (1) adopts a hybrid stator pole structure comprising an excitation pole (10) and an auxiliary pole (11), both the excitation pole (10) and the auxiliary pole (11) are formed by extending the inner wall of the first stator (1) to the inner side in the radial direction, wherein the number of the excitation pole (10) and the auxiliary pole (11) is six and the size and shape are the same;

six excitation poles (10) and six auxiliary poles (11) are 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 larger than the pole arc width which is twice of the auxiliary pole (11).

7. The hybrid excitation bearingless switched reluctance machine according to claim 6, wherein the six poles (10) are wound with a torque winding coil I (4 a), a torque winding coil II (4 b), a torque winding coil III (4 c), a torque winding coil IV (4 d), a torque winding coil V (4 e) and a torque winding coil VI (4 f), respectively, and the winding directions of all the torque winding coils (4) are the same, wherein the number of turns of the torque winding coils (4) is the same and the torque winding coils are all concentrated windings.

8. The hybrid excitation bearingless switched reluctance machine according to claim 7, wherein the torque winding coils (4) of the two diametrically opposite poles (10) of the first stator (1) are connected to form one phase.

9. The hybrid excitation bearingless switched reluctance machine according to claim 1, wherein the first stator (1), the rotor block (20), the annular core (22) and the second stator core (31) are made of materials having magnetic permeability;

the rotor magnetism isolating ring (21) is made of a material without magnetic conductivity;

the torque winding coil I (4 a), the torque winding coil II (4 b), the torque winding coil III (4 c), the torque winding coil IV (4 d), the torque winding coil V (4 e), the torque winding coil VI (4 f) and the suspension winding coil (32) are all made of copper wires with electric conductivity;

the permanent magnet block (30) is made of permanent magnets with remanence.

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