CN115224903B - A hybrid excitation bearingless switched reluctance motor - Google Patents
A hybrid excitation bearingless switched reluctance motorInfo
- Publication number
- CN115224903B CN115224903B CN202210935471.6A CN202210935471A CN115224903B CN 115224903 B CN115224903 B CN 115224903B CN 202210935471 A CN202210935471 A CN 202210935471A CN 115224903 B CN115224903 B CN 115224903B
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- stator
- rotor
- winding coil
- torque winding
- permanent magnet
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
- H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
本申请提供了一种混合励磁式无轴承开关磁阻电机，包括第一定子、转子和第二定子，所述第二定子嵌入第一定子的内侧，转子位于第一定子和第二定子之间，第一定子与转子之间以及转子与第二定子之间均设置有气隙，以使转子在第一定子和第二定子之间转动，第一定子采用混合定子极结构，转子采用圆筒形结构，第二定子采用凸极结构，包括八个凸极和四个永磁体块，其中永磁体块设置在第二定子铁芯内部。本申请解决了传统无轴承开关磁阻电机的转矩与悬浮力控制相互耦合、不同方向的悬浮力极产生的磁通相互耦合、绕组中通入励磁电流来产生偏置磁场，导致电机的转矩与悬浮力控制性能下降、控制难度增加、效率降低的问题。
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 difficulty of control, and a decrease in efficiency.
Description
Technical Field
The application belongs to the technical field of motors, and particularly relates to a hybrid excitation type bearingless switch reluctance motor.
Background
With the rapid development of power electronics technology, switched reluctance motors and their speed regulation systems have been widely used. The switch reluctance motor is especially suitable for high-speed and ultra-high-speed operation due to the advantages of simple structure, no rotor winding, high mechanical strength, wide speed regulation range and the like. However, the rotor of the traditional switched reluctance motor is supported by a mechanical bearing, and the wear of the mechanical bearing is aggravated and the heat is serious due to high-speed operation, so that the service life of the mechanical bearing is greatly reduced, and the reliability of a motor system is further reduced.
The bearingless switched reluctance motor combines the switched reluctance motor and bearingless technology, not only maintains the advantages of simple structure, low cost, strong fault tolerance and the like of the switched reluctance motor, but also has the excellent characteristics of long service life, high output power and the like of the bearingless motor, and has wide application prospect in the field of high-speed driving. However, the torque and the levitation force control of the traditional bearingless switch reluctance motor are mutually coupled, and magnetic fluxes generated by the levitation poles in different directions are mutually coupled, so that the torque and the levitation force control performance of the motor are affected, and the control difficulty of the motor is greatly increased. Meanwhile, in order to generate the required levitation force, the traditional bearingless switch reluctance motor needs to generate a bias magnetic field by introducing exciting current into a winding, so that the loss of the motor is increased and the efficiency is reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a hybrid excitation type bearingless switched reluctance motor, which can solve the problems that the torque and the levitation force control performance of the motor are reduced, the control difficulty is increased and the efficiency is reduced due to the mutual coupling of the torque and the levitation force control of the traditional bearingless switched reluctance motor, the mutual coupling of magnetic fluxes generated by levitation poles in different directions and the excitation current introduced into windings.
In order to solve the problems, the application provides a hybrid excitation type bearingless switched reluctance motor, which comprises a first stator, a rotor and a second stator, wherein the second stator is embedded into the inner side of the first stator, the rotor is positioned between the first stator and the second stator, and air gaps are arranged between the first stator and the rotor and between the rotor and the second stator so as to enable the rotor to rotate between the first stator and the second stator;
the first stator adopts a mixed stator pole structure;
the rotor adopts a cylindrical structure;
The second stator adopts a salient pole structure, wherein the salient pole structure comprises permanent magnet blocks, a second stator core and a suspension winding coil, the suspension winding coil is wound on salient poles of the second stator core, and the permanent magnet blocks are arranged inside the second stator core;
Optionally, the rotor adopts a cylindrical structure, the cylindrical structure comprises rotor blocks, rotor magnetism isolating rings and annular iron cores, the number of the rotor blocks is eight, the rotor blocks are uniformly embedded at the outer sides of the rotor magnetism isolating rings at equal intervals along the circumferential direction of the rotor magnetism isolating rings, and the annular iron cores are embedded at the inner sides of the rotor magnetism isolating rings, so that the rotor magnetism isolating rings separate magnetic fluxes flowing between the rotor and the first stator and magnetic fluxes flowing between the rotor and the second stator;
the shape of the rotor blocks is fan-shaped, the sizes and the shapes of the eight rotor blocks are the same, and the inner surface and the outer surface of the rotor are smooth.
The four permanent magnet blocks are orthogonally distributed in the second stator core along the circumferential direction, each permanent magnet block is positioned on the central line between the two salient poles, the four permanent magnet blocks adopt the circumferences Xiang Chongci, the magnetizing directions of the two permanent magnet blocks with symmetrical axes are the same, and the magnetizing directions of the two adjacent permanent magnet blocks are opposite;
and a magnetic isolation bridge is arranged at the central line position between two adjacent permanent magnet blocks, and the suspension winding coils on the convex poles of the second stator core between the two adjacent magnetic isolation bridges are connected to form a phase.
Optionally, the number of turns of the coil of the suspension winding is the same, and the suspension winding are all centralized windings.
Optionally, the first stator adopts a mixed stator pole structure, the mixed stator pole structure comprises an excitation pole and an auxiliary pole, the excitation pole and the auxiliary pole are formed by extending the inner wall of the first stator inwards along the radial direction, the number of the excitation pole and the auxiliary pole is six, and the size and the shape of the excitation pole and the auxiliary pole are the same;
the six excitation poles and the six auxiliary poles are all arranged on the inner side of the first stator at equal intervals along the circumferential direction of the first stator, wherein the pole arc width of the excitation poles is larger than twice the pole arc width of the auxiliary poles.
Optionally, the six exciting 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 winding directions of all the torque winding coils are consistent, wherein the number of turns of the torque winding coils is the same, and the torque winding coils are all centralized windings.
Optionally, the torque winding coils on the two exciting poles which are oppositely arranged on the diameter of 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 magnetism isolating ring is made of a material which does not have magnetic conductivity;
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 levitation winding coil are made of copper wires with conductivity;
the permanent magnet blocks are made of permanent magnets with residual magnetic density.
Advantageous effects
The mixed excitation type bearingless switch reluctance motor provided by the embodiment of the application comprises a first stator, a rotor and a second stator, wherein eight rotor blocks and annular iron cores on the rotor and the first stator and the second stator respectively form an outer unit motor and an inner unit motor, and then the rotor magnetism isolating ring and the magnetism isolating bridge are matched, the hybrid excitation type bearingless switched reluctance motor thoroughly separates magnetic fluxes generated by the torque winding coil and the levitation winding coil, separates magnetic fluxes generated by levitation poles in different directions, realizes natural decoupling of torque and levitation force control, realizes natural decoupling of levitation force control in different directions, further reduces control difficulty of the motor, and improves torque and levitation force control performance of the motor. In addition, the external unit motor adopts a segmented rotor and mixed stator pole structure, so that the magnetic flux path is shortened, the magnetic flux utilization rate is improved, the reverse magnetic flux in the stator during current commutation of the torque winding is eliminated, the output torque of the motor is further improved, the iron core loss of the motor is reduced, and meanwhile, the internal unit motor adopts the permanent magnet blocks to provide the bias magnetic field, and the running loss of the motor is reduced, so that the hybrid excitation type bearingless switch reluctance motor can improve the running efficiency of the motor.
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 present application;
fig. 2 is a schematic structural view of a first stator according to an embodiment of the present application;
FIG. 3 is a schematic view of a rotor according to an embodiment of the present application;
fig. 4 is a schematic structural view of a second stator according to an embodiment of the present application;
FIG. 5 is a schematic diagram of the overall assembly state of a hybrid excitation type bearingless switched reluctance motor according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a magnetic flux path for supplying power to a torque winding coil in accordance with an embodiment of the present application;
fig. 7 is a schematic diagram of a magnetic flux path for supplying power to a levitation winding coil in accordance with an embodiment of the present application.
The reference numerals are expressed as:
1. The magnetic pole comprises a first stator, a 10, an exciting pole, a 11, an auxiliary pole;
2. a rotor; 20 parts of rotor blocks, 21 parts of rotor magnetism isolating rings, 22 parts of annular iron cores;
3. A second stator; 30 parts of permanent magnet blocks, 31 parts of second stator iron cores, 32 parts of levitation winding coils;
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;
5. And a magnetic isolation bridge.
Detailed Description
Referring to fig. 1 to 7 in combination, 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, the second stator 3 is embedded inside 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 to allow the rotor 2 to rotate between the first stator 1 and the second stator 3;
the first stator 1 adopts a mixed stator pole structure, the mixed stator pole structure comprises an excitation pole 10 and an auxiliary pole 11, and the excitation pole 10 and the auxiliary pole 11 are formed by extending the inner wall of the first stator 1 inwards along the radial direction;
The rotor 2 adopts a cylindrical structure, wherein the cylindrical structure comprises rotor blocks 20, rotor magnetism isolating rings 21 and annular iron cores 22, the number of the rotor blocks 20 is eight, the rotor blocks 20 are uniformly embedded at the outer sides of the rotor magnetism isolating rings 21 at equal intervals along the circumferential direction of the rotor magnetism isolating rings 21, and the annular iron cores 22 are embedded at the inner sides of the rotor magnetism isolating rings 21, so that the rotor magnetism isolating rings 21 separate magnetic fluxes flowing between the rotor 2 and the first stator 1 and magnetic fluxes flowing between the rotor 2 and the second stator 3;
the second stator 3 adopts a salient pole structure, wherein the salient pole structure comprises permanent magnet blocks 30, a second stator core 31 and a levitation winding coil 32, the levitation winding coil 32 is wound on salient poles of the second stator core 31, and the permanent magnet blocks 30 are embedded in the second stator core 31;
The second stator 3 is embedded into the first stator 1, the rotor 2 is arranged between the first stator 1 and the second stator 3, the rotor 2 rotates between the first stator 1 and the second stator 3, eight rotor blocks 20 and annular iron cores 22 on the rotor 2 and the first stator 1 and the second stator 3 respectively form an outer unit motor and an inner unit motor, and then the rotor magnetism isolating ring 21 and the magnetism isolating bridge 5 are matched, compared with the traditional bearingless switch reluctance motor, the hybrid excitation type bearingless switched reluctance motor thoroughly separates magnetic fluxes generated by the torque winding coil 4 and the levitation winding coil 32, separates magnetic fluxes generated by levitation poles in different directions, realizes natural decoupling of torque and levitation force control, realizes natural decoupling of levitation force control in different directions, further reduces control difficulty of the motor, and improves torque and levitation force control performance of the motor. In addition, the outer unit motor of the hybrid excitation type bearingless switched reluctance motor adopts a segmented rotor and hybrid stator pole structure, so that a magnetic flux path is shortened, the magnetic flux utilization rate is improved, the reverse magnetic flux in a stator during current phase conversion of a torque winding coil 4 is eliminated, the output torque of the motor is further improved, the iron core loss of the motor is reduced, meanwhile, the inner unit motor of the hybrid excitation type bearingless switched reluctance motor adopts a permanent magnet block 30 to provide a bias magnetic field, and the running loss of the motor is reduced, so that 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 air gaps are arranged between the first stator 1 and the rotor 2 and between the rotor 2 and the second stator 3, wherein the air gap is an equal-gap air gap, 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 5, the first stator 1 adopts a hybrid stator pole structure including six excitation poles 10 having the same shape and size and six auxiliary poles 11 having the same shape and size, which are distributed inside the first stator 1 at equal intervals along the circumferential direction in a crossing manner. The pole arc width of the excitation 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 wound on the six excitation poles 10 in a concentrated winding form respectively for generating a rotation torque, and the number of turns of the torque winding coils 4 on all the excitation poles 10 is the same, and the winding directions are identical. In addition, the torque winding coils 4 on the two diametrically opposed excitation poles 10 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 torque winding coil II4b and the torque winding coil V4e are connected to form a phase, and the torque winding coil III4c and the torque winding coil VI4f are connected to form a phase.
Further, the auxiliary pole 11 is wound with neither the winding coil 4 nor the permanent magnet, and they provide a circuit only for the magnetic flux generated by the torque winding coil 4.
As shown in fig. 3 and 5, the rotor 2 adopts a cylindrical structure, and includes eight rotor blocks 20, rotor magnetism isolating rings 21 and annular iron cores 22 which are identical in shape and size. Eight rotor blocks 20 are embedded at equal intervals on the outer side of the rotor magnetism isolating ring 21, and an annular iron core 22 is embedded on the inner side of the rotor magnetism isolating ring 21. The rotor magnetism isolating ring 21 not only plays a role of fixing the rotor block 20 and the annular iron core 22, but also can separate magnetic flux generated by the torque winding coil 4 and magnetic flux generated by the levitation winding coil 32, thereby realizing natural decoupling of torque and levitation force control, further reducing control difficulty of the motor and improving control performance of the motor torque and levitation force. In addition, the inner surface and the outer surface of the rotor 2 are smooth without any protrusion, so that the rotor can generate stable levitation force at any rotation position, and the levitation force control performance can be further improved. Meanwhile, when the motor rotates at a high speed, the rotor 2 structure is beneficial to reducing wind friction loss and improving the working efficiency of the motor.
Further, the rotor 2 adopts eight rotor blocks 20, so that the motor has lower operating frequency, and smaller core loss is generated when the motor operates at a high speed, thereby improving the operating efficiency of the whole motor system. In addition, the use of eight rotor blocks 20 for the rotor 2 can make torque waveforms generated by two adjacent rotor blocks 20 overlapping the same excitation pole 10 inconsistent and overlapping each other, thereby facilitating the reduction of torque ripple of the motor.
As shown in fig. 4 and 5, the second stator 3 adopts a salient pole structure including permanent magnet pieces 30, a second stator core 31, and levitation winding coils 32.
Further, the number of the permanent magnet blocks 30 is four, the sizes and the shapes of the permanent magnet blocks 30 are the same, and the second stator 3 is provided with eight magnetic poles.
Further, eight salient poles on the second stator core 31 are uniformly distributed on the outer side of the second stator core 31, the eight salient poles are equal in size and shape, the levitation winding coils 32 with the same number of turns are wound on each salient pole for controlling levitation force, and the winding directions of the levitation winding coils on each salient pole are the same.
Further, four permanent magnet pieces 30 having the same shape and size are embedded in the second stator core 31 for providing a bias magnetic field. Four permanent magnet pieces 30 are orthogonally distributed in the circumferential direction inside the second stator core 31, and each permanent magnet piece 30 is located on the center line between two salient poles. The four permanent magnet blocks 30 adopt circumferences Xiang Chongci, the magnetizing directions of the two permanent magnet blocks 30 with symmetrical axes are the same, and the magnetizing directions of the two adjacent permanent magnet blocks 30 are opposite. A magnetic isolation bridge 5 is arranged at the center line position between two adjacent permanent magnet blocks 30 and is used for separating the magnetic fields generated by the two permanent magnet blocks 30. In addition, the levitation winding coils 32 on the salient poles of the second stator core 31 between two adjacent magnetic separation bridges 5 are connected to form one phase.
Furthermore, the permanent magnet blocks 30 are adopted to replace exciting current in the traditional bearingless switched reluctance motor to generate a bias magnetic field, so that copper consumption of the motor can be effectively reduced, and further the working efficiency of the whole motor system is improved.
As shown in fig. 6, the torque winding coil I4a and the torque winding coil IV4d are connected to form a phase, and when power is supplied to the torque winding coil I4a and the torque winding coil IV4d, magnetic fluxes generated by the torque winding coil I4a and the torque winding coil IV4d start from the excitation pole 10, pass through the air gap, and form a closed loop through the rotor block 20 and the auxiliary pole 11. The magnetic flux path is shorter, so that leakage magnetic flux can be effectively reduced, the utilization rate of the magnetic flux is improved, and the output torque of the motor is further improved. Meanwhile, due to the rotor magnetism blocking ring 21, magnetic fluxes generated by the torque winding coil I4a and the torque winding coil IV4d do not enter the toroidal core 22 and the second stator 3. In addition, when the torque winding current is changed from one phase to another, there is no reverse magnetic flux in the first stator 1, which is advantageous in reducing core loss and further improving motor efficiency.
As shown in fig. 7, the rotor 2 is in an equilibrium position, when the levitation winding coil 32 is not energized, the magnetic flux generated by the permanent magnet blocks 30 starts from the permanent magnet blocks 30, passes through one salient pole of the second stator core 31, passes through the air gap, passes through the annular iron core 22 and the salient pole of the adjacent second stator core 31 to form a closed loop, as shown by a long dashed line in the figure, at this time, the magnetic field in the air gap of the motor is uniformly and symmetrically distributed, and the motor does not generate levitation force. When energized, levitated winding coil 32 produces a magnetic flux as shown by the dotted line. The magnetic flux generated by the levitation winding coil 32 interacts with the magnetic flux generated by the permanent magnet blocks 30 to cause an asymmetric distribution of the magnetic field in the motor air gap, thereby creating a levitation force. Thus, by controlling the magnitude and direction of the current in the different levitation winding coils 32, a desired levitation force can be generated.
Further, as shown in fig. 7, due to the effects of the rotor magnetism isolating ring 21 and the magnetism isolating bridge 5, magnetic fluxes generated by the permanent magnet blocks 30 and the levitation winding coils 32 cannot enter the rotor blocks 20 and the first stator 1 or enter adjacent levitation poles, so that magnetic flux coupling between the levitation poles in different directions in the conventional bearingless switched reluctance motor is eliminated, and control difficulty of levitation force of the motor can be reduced.
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 plates DW350, DR470, DR510, 35PN440, 35PN210, M19 and other magnetic materials, and are formed by punching and stacking;
the rotor magnetism isolating ring 21 is made of non-magnetic conductive materials such as aluminum, steel, titanium alloy and the like;
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, the torque winding coil VI4f and the suspension winding coil 32 are all formed by winding copper wires with good electric conductivity, then dipping paint and drying;
The permanent magnet blocks 30 are made of neodymium iron boron (NdFeB), samarium cobalt (SmCo) or aluminum nickel cobalt (AlNiCo) permanent magnets with higher residual magnetic densities.
The application relates to a mixed excitation type bearingless switch reluctance motor, which comprises a first stator 1, a rotor 2 and a second stator 3, wherein eight rotor blocks 20 and annular iron cores 22 on the rotor 2 and the first stator 1 and the second stator 3 respectively form an outer unit motor and an inner unit motor, and then a rotor magnetism isolating ring 21 and a magnetism isolating bridge 5 are matched, the motor thoroughly separates magnetic fluxes generated by the torque winding coil 4 and the levitation force winding coil 32, separates magnetic fluxes generated by levitation force poles in different directions, realizes natural decoupling of torque and levitation force control, realizes natural decoupling of levitation force control in different directions, further reduces control difficulty of the motor, and improves torque and levitation force control performance of the motor. In addition, the external unit motor adopts a segmented rotor and mixed stator pole structure, so that the magnetic flux path is shortened, the magnetic flux utilization rate is improved, the reverse magnetic flux in the stator during current commutation of the torque winding coil 4 is eliminated, the output torque of the motor is further improved, the iron core loss of the motor is reduced, and meanwhile, the internal unit motor adopts the permanent magnet blocks 30 to provide a bias magnetic field, and the running loss of the motor is reduced, so that the mixed excitation type bearingless switch reluctance motor can improve the running efficiency of the motor.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
Claims (6)
1. The 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 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) rotates 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 permanent magnet blocks (30), a second stator core (31) and a suspension winding coil (32), the suspension winding coil (32) is wound on salient poles of the second stator core (31), and the permanent magnet blocks (30) are arranged inside the second stator core (31);
Four permanent magnet blocks (30) are embedded in the second stator core (31), the four permanent magnet blocks (30) are distributed orthogonally in the second stator core (31) along the circumferential direction, each permanent magnet block (30) is located on a central line between two salient poles, the four permanent magnet blocks (30) are magnetized circumferentially, the magnetizing directions of the two permanent magnet blocks (30) with symmetrical axes are the same, the magnetizing directions of the two adjacent permanent magnet blocks (30) are opposite, a magnetism isolating bridge (5) is arranged at the central line position between the two adjacent permanent magnet blocks (30), and suspension winding coils (32) on the salient poles of the second stator core (31) between the two adjacent magnetism isolating bridges (5) are connected to form a phase;
The first stator (1) adopts a mixed stator pole structure, the mixed stator pole structure comprises an excitation pole (10) and an auxiliary pole (11), the excitation pole (10) and the auxiliary pole (11) are formed by extending the inner wall of the first stator (1) inwards along the radial direction, wherein the number of the excitation pole (10) and the auxiliary pole (11) is six, and the sizes and the shapes are the same;
The six excitation poles (10) are respectively 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), wherein the torque winding coil (4) comprises 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), the winding directions of all the torque winding coils (4) are identical, and the number of turns of the torque winding coils (4) is the same, and all the torque winding coils are concentrated windings.
2. The hybrid excitation type bearingless switched reluctance motor according to claim 1, wherein the rotor (2) adopts a cylindrical structure, the cylindrical structure comprises eight rotor blocks (20), rotor magnetism isolating rings (21) and annular iron cores (22), the rotor blocks (20) are uniformly embedded at the outer sides of the rotor magnetism isolating rings (21) at equal intervals along the circumferential direction of the rotor magnetism isolating rings (21), and the annular iron cores (22) are embedded at the inner sides of the rotor magnetism isolating rings (21), so that the rotor magnetism isolating rings (21) separate magnetic fluxes flowing between the rotor (2) and the first stator (1) and magnetic fluxes flowing between the rotor (2) and the second stator (3);
The rotor blocks (20) are fan-shaped, the sizes and the shapes of the eight rotor blocks (20) are the same, and the inner surface and the outer surface of the rotor (2) are smooth.
3. The hybrid excitation type bearingless switched reluctance motor according to claim 1, wherein the number of the permanent magnet blocks (30) is four, the sizes and the shapes of the permanent magnet blocks (30) are the same, the second stator (3) is provided with eight salient poles, and the sizes and the shapes of the eight salient poles arranged on the second stator core (31) are the same.
4. The hybrid-excitation bearingless switched reluctance motor of claim 1 wherein the levitation winding coils (32) have the same number of turns and are all concentrated windings.
5. The hybrid excitation type bearingless switched reluctance motor according to claim 1, wherein the torque winding coils (4) on two excitation poles (10) which are arranged opposite to each other in diameter of the first stator (1) are connected to form one phase.
6. The hybrid excitation type bearingless switched reluctance motor according to claim 1, wherein the first stator (1), the rotor block (20), the annular iron core (22) and the second stator iron core (31) are made of materials with magnetic conductivity;
the rotor magnetism isolating ring (21) is made of a material which does not have magnetic permeability;
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 made of copper wires with conductive performance;
The permanent magnet blocks (30) are made of permanent magnets with residual magnetic density.
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| CN120110110B (en) * | 2025-03-13 | 2026-02-06 | 沈阳工业大学 | A switched reluctance motor |
| CN120110111B (en) * | 2025-03-13 | 2026-01-23 | 沈阳工业大学 | A hybrid excitation switched reluctance motor combining axial and radial air gaps |
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| CN112653258A (en) * | 2020-12-10 | 2021-04-13 | 哈尔滨理工大学 | Novel bearing-free modular high-speed permanent magnet synchronous motor structure |
| CN214256083U (en) * | 2020-09-08 | 2021-09-21 | 山东科技大学 | Magnetic suspension switched reluctance motor with double stator segmented rotors |
| CN114172335A (en) * | 2021-11-30 | 2022-03-11 | 中山大学 | Stator-partition hybrid excitation stator-rotor dual-permanent-magnet vernier motor |
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| CN102158027A (en) * | 2011-03-30 | 2011-08-17 | 上海中科深江电动车辆有限公司 | Dual-stator permanent-magnet synchronous power generation-electric motor |
| JP2013207979A (en) * | 2012-03-29 | 2013-10-07 | Panasonic Corp | Rotary machine, driving method of motor and motor driving system |
| CN104883015B (en) * | 2015-05-06 | 2017-09-19 | 东南大学 | Double-stator Superconducting Field Modulation Motor |
| CN108880151A (en) * | 2018-06-19 | 2018-11-23 | 江苏大学 | A kind of bimorph transducer sectional type magnetic suspension switched reluctance motor |
| CN108880152B (en) * | 2018-07-24 | 2020-09-25 | 江苏大学 | A dual-stator hybrid excitation magnetic suspension switched reluctance motor |
| CN112087114B (en) * | 2020-08-31 | 2021-08-03 | 江苏大学 | A hybrid excitation double stator switched reluctance motor |
| CN112065855B (en) * | 2020-09-17 | 2022-01-28 | 淮阴工学院 | Four-pole double-stator hybrid magnetic bearing controlled by external winding |
| CN112160987B (en) * | 2020-10-27 | 2024-12-31 | 珠海格力电器股份有限公司 | Magnetic bearing components, motors and compressors |
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| CN214256083U (en) * | 2020-09-08 | 2021-09-21 | 山东科技大学 | Magnetic suspension switched reluctance motor with double stator segmented rotors |
| CN112653258A (en) * | 2020-12-10 | 2021-04-13 | 哈尔滨理工大学 | Novel bearing-free modular high-speed permanent magnet synchronous motor structure |
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