A reluctance hybrid magnetic circuit brushless doubly-fed machine

Abstract

The application discloses a reluctance hybrid magnetic circuit brushless doubly-fed motor, wherein a reluctance rotor is coaxially arranged inside a stator core, and a rotating shaft penetrates through the stator core and the reluctance rotor; a left end cover core and a right end cover core are arranged on both sides of the stator core respectively, and the left end cover core and the right end cover core are connected with the rotating shaft through bearings respectively. The reluctance hybrid magnetic circuit brushless doubly-fed motor adopts one set of power windings and two sets of control windings, wherein the power windings are arranged on the stator, and the control windings are arranged in the left and right end covers of the motor respectively, so that the direct coupling of the power windings and the control windings can be reduced, the conflict of the windings in the placement position is avoided, and the design of the embedded wire and the insulation structure is facilitated. Compared with the brushless doubly-fed motor adopting one set of control windings, the capacity of one set of control windings of the motor is only half of the required capacity, and the motor can still operate for a short time when one set of control windings fails, so that the reliability and the fault tolerance of the motor are improved.

Description

Technical Field

[0001] This invention belongs to the field of motors, specifically relating to a reluctance-type hybrid magnetic circuit brushless doubly fed motor. Background Technology

[0002] Energy crisis and environmental pollution are two major challenges facing the world today. Wind energy, as a clean and renewable energy source, occupies an important position in the current new energy power generation market. With the rapid development of wind power generation, higher requirements have been placed on the technical indicators of wind power generation systems, such as size, weight, and efficiency. Currently, the generator sets widely used in wind power generation are mainly divided into three types: squirrel-cage asynchronous generator sets, doubly-fed wind turbine generator sets, and permanent magnet direct-drive wind turbine generator sets. Among them, squirrel-cage asynchronous generators and permanent magnet direct-drive generators cannot achieve variable-speed, constant-frequency, and constant-voltage power generation, and require a full-power power converter, resulting in higher costs. Although doubly-fed wind turbine generators can achieve variable-speed, constant-frequency, and constant-voltage power generation, and the power converter on the rotor side of the motor only needs to provide slip power, which is only 20%-30% of the generator's rated power, greatly reducing costs, the presence of brushes limits the capacity of a single generator and also reduces the reliability of the motor. Based on the cascade connection of two induction motors, a magnetic field modulation brushless doubly-fed motor has been developed. The motor stator has two sets of windings, which are indirectly coupled using a reluctance rotor. Since the two sets of windings share a single stator core, the complexity of the insulation design is increased, and the stator core is prone to saturation, hindering widespread adoption. To overcome these problems, experts have conducted extensive research and improvements on the motor structure design, achieving a series of results.

[0003] The invention patent (CN106026578A) proposes a reluctance brushless doubly-fed motor based on magnetic field modulation effect. This motor includes two stators (inner and outer) and a reluctance rotor, all arranged concentrically from the inside out. The sum of the equivalent pole pairs of the windings on the inner and outer stators equals the number of adjusting magnetic blocks on the intermediate rotor. The two sets of windings are indirectly coupled using adjusting magnetic blocks on the rotor, avoiding the problem of stator core saturation caused by sharing a single stator core. However, the intermediate rotor of this motor is made of magnetic blocks and non-magnetic materials bonded together, which reduces the motor's mechanical strength compared to traditional reluctance rotors and also increases the difficulty of motor manufacturing.

[0004] The invention patent (CN106451970A) proposes a double-stator, four-electric-port brushless doubly-fed motor with a reluctance rotor. This motor includes two stators (inner and outer) and a cup-shaped reluctance rotor. Both the inner and outer stators have two sets of windings: a power winding and a control winding. The outer and inner power windings are arranged in the same way, as are the outer and inner control windings. The outer power winding and the inner control winding form one working group, and the outer control winding and the inner power winding form another working group. The sum of the capacities of these two working groups is the total capacity of the motor, and their capacities can be arbitrarily allocated. When one working group fails, the other can continue to operate normally, improving the motor's reliability and fault tolerance. However, the rotor of this motor is composed of magnetic blocks and non-magnetic blocks, which reduces the motor's mechanical strength and places certain requirements on the manufacturing process. Furthermore, the two sets of windings on both the inner and outer stators share a single stator core, which can easily lead to stator core saturation and creates space conflicts. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a reluctance-type hybrid magnetic circuit brushless doubly fed motor, which not only avoids conflicts in winding placement space and improves space utilization, but also utilizes a reluctance rotor to achieve coupling of axial and radial magnetic flux in the motor.

[0006] The specific technical solution for achieving the objective of this invention is as follows:

[0007] A reluctance-type hybrid magnetic circuit brushless doubly fed motor includes a stator core, a left end cover core, a right end cover core, a reluctance rotor, a shaft, and bearings;

[0008] The reluctance rotor is coaxially disposed inside the stator core, and the shaft passes through the stator core and the reluctance rotor. A left end cap core and a right end cap core are respectively disposed on both sides of the stator core, and the left end cap core and the right end cap core are respectively connected to the shaft through bearings.

[0009] Furthermore, an air gap is provided between the stator core and the reluctance rotor, and air gaps are also provided between the left end cover core and the reluctance rotor, and between the right end cover core and the reluctance rotor.

[0010] Furthermore, the stator core includes a stator yoke, stator teeth, and stator slots;

[0011] The plurality of stator teeth are arranged on the stator yoke, and stator slots are arranged between adjacent stator teeth, with power windings arranged in the stator slots.

[0012] Furthermore, the reluctance rotor includes a tuning magnet block and a non-magnetic material;

[0013] The plurality of adjusting magnets and the plurality of non-magnetic materials are arranged at intervals and fixed on the rotating shaft in sequence, rotating synchronously with the rotating shaft.

[0014] Furthermore, the ratio of the diameter to the circumference of the reluctance rotor is 1:1.

[0015] Furthermore, the left end cap core includes a left end cap tooth, a left end cap yoke, a left end cap groove, a left end cap internal space, and a left end cap external space;

[0016] The left end cover core is provided with a left end cover yoke on the side facing the reluctance rotor. Left end cover teeth are evenly arranged on the left end cover yoke, and left end cover grooves are provided between the left end cover teeth.

[0017] The left end cover teeth to the edge of the left end cover core leave both internal and external spaces for the left end cover.

[0018] The right end cap core includes a right end cap tooth, a right end cap yoke, a right end cap groove, a right end cap internal space, and a right end cap external space.

[0019] The right end cover core is provided with a right end cover yoke on the side facing the reluctance rotor. Right end cover teeth are evenly arranged on the right end cover yoke, and right end cover grooves are provided between the right end cover teeth.

[0020] The edge of the right end cover tooth to the right end cover core has both internal and external spaces for the right end cover.

[0021] Furthermore, a first control winding is wound on the left end cap teeth, and a second control winding is wound on the right end cap teeth;

[0022] The first control winding and the second control winding are wound in the same way.

[0023] Furthermore, the number of pole pairs of the first control winding and the second control winding is P. r The number of pole pairs of the power winding is P s The number of pole pairs of the reluctance rotor is N. st ,but:

[0024] N st =P s +P r .

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) The reluctance type hybrid magnetic circuit brushless doubly fed motor of the present invention adopts one set of power winding and two sets of control winding. The power winding is located on the stator, and the control winding is located in the left and right end covers of the motor respectively. This can reduce the direct coupling between the power winding and the control winding, avoid the conflict in the placement of the winding, facilitate the design of the winding and insulation structure, and improve the utilization rate of the internal space of the motor, which is conducive to the improvement of the power density of the motor.

[0027] (2) The motor rotor of the present invention is composed of a magnetic block and a non-magnetic material, which is fixed together with the shaft and rotates synchronously with the shaft. Compared with the intermediate rotor structure, it has high strength and is easy to manufacture, which ensures the mechanical strength of the motor, improves the reliability of the motor, and is conducive to the application of the motor in different occasions.

[0028] (3) The present invention uses two sets of control windings. Compared with a brushless doubly fed motor that uses one set of control windings, the capacity of one set of control windings of the present invention is only half of the required capacity under the same capacity. Moreover, when one set of control windings fails, it can still run for a short time with one set of power windings and one set of control windings, which improves the reliability and fault tolerance of the motor.

[0029] (4) The two sets of windings of the traditional brushless doubly fed motor are located on the stator. When the motor fails, it is difficult to troubleshoot and repair the fault. The stator, rotor and left and right end covers of the motor of the present invention can adopt a modular structure, which is convenient for transportation and on-site installation, as well as for troubleshooting and repairing motor faults.

[0030] (5) This invention utilizes the modulation effect of the reluctance rotor to achieve coupling of the axial / radial magnetic circuit of the motor. When the motor of this invention is running as a generator, variable speed constant frequency and constant voltage power generation can be achieved by changing the frequency and amplitude of the current supplied to the control winding. Attached Figure Description

[0031] Figure 1 This is a schematic axial cross-sectional view of the reluctance-type hybrid magnetic circuit brushless doubly fed motor of the present invention.

[0032] Figure 2 This is a schematic diagram of the radial structure of the reluctance-type hybrid magnetic circuit brushless doubly fed motor of the present invention.

[0033] Figure 3 This is a schematic diagram of the core structure of the left end cover of the reluctance-type hybrid magnetic circuit brushless doubly fed motor of the present invention. Figure 1 .

[0034] Figure 4 This is a schematic diagram of the core structure of the left end cover of the reluctance-type hybrid magnetic circuit brushless doubly fed motor of the present invention. Figure 2 .

[0035] Figure 5 This is a schematic diagram of the operation of a reluctance-type hybrid magnetic circuit brushless doubly fed motor in an embodiment of the present invention. Detailed Implementation

[0036] A reluctance-type hybrid magnetic circuit brushless doubly fed motor includes a stator core 1, a left end cover core 2, a right end cover core 3, a reluctance rotor 4, a shaft 11, and a bearing 12.

[0037] The reluctance rotor 4 is coaxially disposed inside the stator core 1, and the rotating shaft 11 passes through the stator core 1 and the reluctance rotor 4; the left end cover core 2 and the right end cover core 3 are respectively disposed on both sides of the stator core 1, and the left end cover core 2, the right end cover core 3 and the rotating shaft 11 are respectively connected by bearings 12.

[0038] Furthermore, an air gap is provided between the stator core 1 and the reluctance rotor 4, and air gaps are also provided between the left end cover core 2 and the reluctance rotor 4, and between the right end cover core 3 and the reluctance rotor 4. The size of the air gap is related to the power rating of the motor and the processing technology of the related components.

[0039] Among them, a first air gap 8 is provided between the stator core 1 and the reluctance rotor 4, a second air gap 9 is provided between the left end cover core 2 and the reluctance rotor 4, and a third air gap 10 is provided between the right end cover core 3 and the reluctance rotor 4.

[0040] Furthermore, the stator core 1 includes a stator yoke 1-1, stator teeth 1-2, and stator slots 1-3;

[0041] The plurality of stator teeth 1-2 are arranged on the stator yoke 1-1, and stator slots 1-3 are arranged between adjacent stator teeth 1-2, and power windings 5 ​​are arranged in stator slots 1-3.

[0042] Furthermore, the reluctance rotor 4 includes a tuning magnet block 4-1 and a non-magnetic material 4-2;

[0043] The plurality of adjusting magnet blocks 4-1 and the plurality of non-magnetic materials 4-2 are arranged at intervals and fixed sequentially on the rotating shaft 11, rotating synchronously with the rotating shaft 11. Compared with the intermediate rotor structure, it has high strength and is easy to manufacture, and its number of poles is N. st ;

[0044] Furthermore, the ratio of the diameter to the circumference of the reluctance rotor 4 is 1:1, which is used to achieve axial / radial magnetic circuit coupling based on the reluctance rotor 4. Therefore, the axial length of the reluctance rotor 4 should not be too long.

[0045] Furthermore, the left end cover core 2 includes a left end cover tooth 2-1, a left end cover yoke 2-2, a left end cover groove 2-3, a left end cover internal space 2-4, and a left end cover external space 2-5;

[0046] The left end cover core 2 is formed by stacking electrical silicon steel sheets based on double-sided insulation. The left end cover yoke 2-2 is uniformly punched on the side surface of the left end cover core 2 facing the reluctance rotor 4. The left end cover teeth 2-1 are uniformly arranged on the left end cover yoke 2-2, and the left end cover grooves 2-3 are arranged between the left end cover teeth 2-1.

[0047] The left end cover teeth 2-1 to the edge of the left end cover core 2 leave an internal space 2-4 and an external space 2-5 for the left end cover, which facilitates the placement of the end of the first control winding 6 and avoids contact between the coil of the first control winding 6 and the moving parts of the motor, thereby increasing the stability and reliability of the motor.

[0048] The right end cap core 3 includes a right end cap tooth 3-1, a right end cap yoke 3-2, a right end cap groove 3-3, a right end cap internal space 3-4, and a right end cap external space 3-5;

[0049] The right end cover core 3 is provided with a right end cover yoke 3-2 on the side facing the reluctance rotor 4. Right end cover teeth 3-1 are evenly arranged on the right end cover yoke 3-2, and right end cover grooves 3-3 are provided between the right end cover teeth 3-1.

[0050] The right end cover teeth 3-1 to the edge of the right end cover core 3 leave an internal space 3-4 and an external space 3-5 for the right end cover, which facilitates the placement of the end of the second control winding 7 and avoids contact between the coil of the second control winding 7 and the moving parts of the motor, thereby increasing the stability and reliability of the motor.

[0051] Furthermore, a first control winding 6 is wound on the left end cap tooth 2-1, and a second control winding 7 is wound on the right end cap tooth 3-1.

[0052] The first control winding and the second control winding 7 are wound in the same way.

[0053] Furthermore, the motor of the present invention utilizes the magnetic field modulation effect to achieve indirect coupling between the power winding 5 and the first control winding 6 and the second control winding 7, so the number of pole pairs of the first control winding 6 and the second control winding 7 is P. r The number of pole pairs of power winding 5 is P. s The number of pole pairs of the reluctance rotor 4 is N. st ,but:

[0054] N st =P s +P r

[0055] The left end cover core 2 and the right end cover core 3 of the motor of the present invention are made of magnetic materials. Therefore, the stator core 1, the reluctance rotor 4, the left end cover core 2 and the right end cover core 3 respectively form two magnetic flux paths, which are axial / radial mixed magnetic circuits.

[0056] The motor of this invention uses two sets of control windings, located in the left end cover core 2 and the right end cover core 3. When current is applied to the first control winding 6 located in the left end cover core 2, the magnetic flux path generated by the first control winding 6 is: left end cover tooth 2-1, second air gap 9, reluctance rotor 4, first air gap 8, stator tooth 1-2, stator yoke 1-1, left end cover yoke 2-2, forming a closed loop. The magnetic flux is coupled to the power winding 5 through the stator tooth 1-2.

[0057] When current is passed through the second control winding 7 located in the right end cover core 3, the magnetic flux path generated by the second control winding 7 is: right end cover teeth, third air gap 10, magnetic reluctance rotor 4, first air gap 8, stator teeth 1-2, stator yoke 1-1, right end cover yoke, forming a closed loop, and coupled to the power winding 5 through stator teeth 1-2.

[0058] It can be seen that the first control winding 6 and the second control winding 7 share the slip power of the motor. Therefore, when one of the control windings fails, the motor can still run briefly, improving the reliability and fault tolerance of the motor.

[0059] The present invention will be further described below with reference to the embodiments.

[0060] Example

[0061] Combination Figures 1 to 4 A reluctance-type hybrid magnetic circuit brushless doubly fed motor includes a stator core 1, a left end cover core 2, a right end cover core 3, a reluctance rotor 4, a shaft 11, and a bearing 12.

[0062] The reluctance rotor 4 is coaxially disposed inside the stator core 1, and the rotating shaft 11 passes through the stator core 1 and the reluctance rotor 4; the left end cover core 2 and the right end cover core 3 are respectively disposed on both sides of the stator core 1, and the left end cover core 2, the right end cover core 3 and the rotating shaft 11 are respectively connected by bearings 12.

[0063] Furthermore, an air gap is provided between the stator core 1 and the reluctance rotor 4, and air gaps are also provided between the left end cover core 2 and the reluctance rotor 4, and between the right end cover core 3 and the reluctance rotor 4. The size of the air gap is related to the power rating of the motor and the processing technology of the related components.

[0064] Among them, a first air gap 8 is provided between the stator core 1 and the reluctance rotor 4, a second air gap 9 is provided between the left end cover core 2 and the reluctance rotor 4, and a third air gap 10 is provided between the right end cover core 3 and the reluctance rotor 4.

[0065] Furthermore, the stator core 1 includes a stator yoke 1-1, stator teeth 1-2, and stator slots 1-3;

[0066] The plurality of stator teeth 1-2 are arranged on the stator yoke (1-1), and stator slots 1-3 are arranged between adjacent stator teeth 1-2, and power windings 5 ​​are arranged in stator slots 1-3.

[0067] Furthermore, the reluctance rotor 4 includes a tuning magnet block 4-1 and a non-magnetic material 4-2;

[0068] The plurality of adjusting magnet blocks 4-1 and the plurality of non-magnetic materials 4-2 are arranged at intervals and fixed sequentially on the rotating shaft 11, rotating synchronously with the rotating shaft 11. Compared with the intermediate rotor structure, it has high strength and is easy to manufacture, and its number of poles is N. st ;

[0069] Furthermore, the ratio of the diameter to the circumference of the reluctance rotor 4 is 1:1, which is used to achieve axial / radial magnetic circuit coupling based on the reluctance rotor 4. Therefore, the axial length of the reluctance rotor 4 should not be too long.

[0070] Furthermore, the left end cover core 2 includes a left end cover tooth 2-1, a left end cover yoke 2-2, a left end cover groove 2-3, a left end cover internal space 2-4, and a left end cover external space 2-5;

[0071] The left end cover core 2 is formed by stacking electrical silicon steel sheets based on double-sided insulation. The left end cover yoke 2-2 is uniformly punched on the side surface of the left end cover core 2 facing the reluctance rotor 4. The left end cover teeth 2-1 are uniformly arranged on the left end cover yoke 2-2, and the left end cover grooves 2-3 are arranged between the left end cover teeth 2-1.

[0072] The left end cover teeth 2-1 to the edge of the left end cover core 2 leave an internal space 2-4 and an external space 2-5 for the left end cover, which facilitates the placement of the end of the first control winding 6 and avoids contact between the coil of the first control winding 6 and the moving parts of the motor, thereby increasing the stability and reliability of the motor.

[0073] The right end cap core 3 includes a right end cap tooth 3-1, a right end cap yoke 3-2, a right end cap groove 3-3, a right end cap internal space 3-4, and a right end cap external space 3-5;

[0074] The right end cover core 3 is provided with a right end cover yoke 3-2 on the side facing the reluctance rotor 4. Right end cover teeth 3-1 are evenly arranged on the right end cover yoke 3-2, and right end cover grooves 3-3 are provided between the right end cover teeth 3-1.

[0075] The right end cover teeth 3-1 to the edge of the right end cover core 3 leave an internal space 3-4 and an external space 3-5 for the right end cover, which facilitates the placement of the end of the second control winding 7 and avoids contact between the coil of the second control winding 7 and the moving parts of the motor, thereby increasing the stability and reliability of the motor.

[0076] Furthermore, a first control winding 6 is wound on the left end cap tooth 2-1, and a second control winding 7 is wound on the right end cap tooth 3-1.

[0077] The first control winding and the second control winding 7 are wound in the same way.

[0078] Furthermore, the motor of the present invention utilizes the magnetic field modulation effect to achieve indirect coupling between the power winding 5 and the first control winding 6 and the second control winding 7, so the number of pole pairs of the first control winding 6 and the second control winding 7 is P. r The number of pole pairs of power winding 5 is P. s The number of pole pairs of the reluctance rotor 4 is N. st ,but:

[0079] N st =P s +P r

[0080] In this embodiment, the number of pole pairs of the first control winding 6 and the second control winding 7 is P. r =1, number of poles N of reluctance rotor st =4, power winding 5-pole pairs P s =3;

[0081] The left end cover core 2 and the right end cover core 3 of the motor of the present invention are made of magnetic materials. Therefore, the stator core 1, the reluctance rotor 4, the left end cover core 2 and the right end cover core 3 respectively form two magnetic flux paths, which are axial / radial mixed magnetic circuits.

[0082] The motor of this invention uses two sets of control windings, located in the left end cover core 2 and the right end cover core 3. When current is applied to the first control winding 6 located in the left end cover core 2, the magnetic flux path generated by the first control winding 6 is: left end cover tooth 2-1, second air gap 9, reluctance rotor 4, first air gap 8, stator tooth 1-2, stator yoke 1-1, left end cover yoke 2-2, forming a closed loop. The magnetic flux is coupled to the power winding 5 through the stator tooth 1-2.

[0083] When current is passed through the second control winding 7 located in the right end cover core 3, the magnetic flux path generated by the second control winding 7 is: right end cover teeth, third air gap 10, magnetic reluctance rotor 4, first air gap 8, stator teeth 1-2, stator yoke 1-1, right end cover yoke, forming a closed loop, and coupled to the power winding 5 through stator teeth 1-2.

[0084] It can be seen that the first control winding 6 and the second control winding 7 share the slip power of the motor. Therefore, when one of the control windings fails, the motor can still run briefly, improving the reliability and fault tolerance of the motor.

[0085] Combination Figure 5In this embodiment, when the reluctance-type hybrid magnetic circuit brushless doubly fed motor is implemented, two sets of control windings are connected to the frequency converter 13, and the frequency converter 13 is connected to the power grid 14. The frequency converter 13 can change the current frequency. If the phase sequence is consistent and the frequency is f in the two sets of control windings, the frequency can be changed. c The current controls the winding to generate a pole pair number of P in the second air gap 9 and the third air gap 10. c The rotational speed is The axial magnetic field, after being modulated by the reluctance rotor 4, generates a pole pair number of P in the first air gap 8. s The radial rotating magnetic field has a rotational speed related to the frequency of the current flowing through the control winding and the rotational speed of the reluctance rotor 4. After passing through stator teeth 1-2 and the power winding 5, if the reluctance rotor 4 rotates at a speed of n under external force, an electromotive force will be induced in the power winding 5, thereby outputting electrical power. The frequency of this induced electromotive force is... Therefore, when the rotational speed of the reluctance rotor 4 changes, the frequency of the induced electromotive force f of the motor can be adjusted by changing the frequency of the current flowing through the control winding. s Furthermore, the amplitude of the induced electromotive force of the motor can be kept constant by changing the magnitude of the current in the control winding. Therefore, in the field of power generation, variable speed constant frequency constant voltage power generation can be achieved.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0087] The above embodiments illustrate and describe the basic principles and main features of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A reluctance hybrid magnetic circuit brushless doubly-fed electric machine, characterized by, It comprises a stator core (1), a left end cover core (2), a right end cover core (3), a reluctance rotor (4), a rotating shaft (11) and a bearing (12). The reluctance rotor (4) is coaxially arranged inside the stator core (1), the rotating shaft (11) passes through the stator core (1) and the reluctance rotor (4); the left end cover core (2) and the right end cover core (3) are arranged on both sides of the stator core (1) respectively, and the left end cover core (2) and the right end cover core (3) are connected with the rotating shaft (11) through the bearing (12) respectively. The stator core (1) comprises a stator yoke (1-1), a stator tooth (1-2) and a stator slot (1-3). A plurality of stator teeth (1-2) are arranged on the stator yoke (1-1), and a stator slot (1-3) is arranged between adjacent stator teeth (1-2), and a power winding (5) is arranged in the stator slot (1-3). The left end cover core (2) comprises a left end cover tooth (2-1), a left end cover yoke (2-2), a left end cover slot (2-3), a left end cover inner space (2-4) and a left end cover outer space (2-5). The left end cover core (2) is provided with the left end cover yoke (2-2) on the side facing the reluctance rotor (4), the left end cover yoke (2-2) is uniformly provided with the left end cover tooth (2-1), and the left end cover slot (2-3) is arranged between the left end cover teeth (2-1). The left end cover tooth (2-1) to the edge of the left end cover core (2) leaves the left end cover inner space (2-4) and the left end cover outer space (2-5). The right end cover core (3) comprises a right end cover tooth (3-1), a right end cover yoke (3-2), a right end cover slot (3-3), a right end cover inner space (3-4) and a right end cover outer space (3-5). The right end cover core (3) is provided with the right end cover yoke (3-2) on the side facing the reluctance rotor (4), the right end cover yoke (3-2) is uniformly provided with the right end cover tooth (3-1), and the right end cover slot (3-3) is arranged between the right end cover teeth (3-1). The right end cover tooth (3-1) to the edge of the right end cover core (3) leaves the right end cover inner space (3-4) and the right end cover outer space (3-5).

2. The reluctance hybrid magnetic circuit brushless doubly-fed machine according to claim 1, characterized in that, The stator core (1) and the reluctance rotor (4) are provided with air gaps, and the left end cover core (2) and the right end cover core (3) are provided with air gaps.

3. The reluctance hybrid magnetic circuit brushless doubly-fed machine according to claim 1, characterized in that, The reluctance rotor (4) comprises a magnetic adjusting iron block (4-1) and a non-magnetic material (4-2). A plurality of magnetic adjusting iron blocks (4-1) and a plurality of non-magnetic materials (4-2) are arranged at intervals and fixed on the rotating shaft (11) in sequence, and rotate synchronously with the rotating shaft (11).

4. The reluctance hybrid magnetic circuit brushless doubly-fed machine according to claim 3, characterized in that, The ratio of the diameter to the circumference of the reluctance rotor (4) is 1:

1.

5. The reluctance hybrid magnetic circuit brushless doubly-fed machine according to claim 1, characterized in that, The first control winding (6) is wound on the left end cover tooth (2-1), and the second control winding (7) is wound on the right end cover tooth (3-1). The first control winding and the second control winding (7) have the same winding mode.

6. The reluctance hybrid magnetic circuit brushless doubly-fed machine according to claim 5, characterized in that, The first control winding (6) and the second control winding (7) have a pole pair number P r The power winding (5) has a pole pair number P s The reluctance rotor (4) has a pole pair number N st then: N st = P s + P r .

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