CN115001229A - An Axial Flux Switched Reluctance Motor with Full Pitch Winding and Its Multi-objective Optimization Method - Google Patents

Abstract

The invention discloses an axial flux switch reluctance motor with a full-pitch winding and a multi-objective optimization method thereof, belongs to the field of novel motor design, and provides an axial flux switch reluctance motor scheme which is small in axial length, short in flux path, high in energy conversion rate and high in torque density and a multi-objective optimization method which is less in calculation time. Compared with the traditional axial flux switch reluctance motor adopting concentrated windings, the motor has higher rated power under the same volume, and the power density and the torque density are improved. Meanwhile, the motor has the advantages of large output, simple structure, easy maintenance, high reliability and the like, and has good engineering application value.

Description

An Axial Flux Switched Reluctance Motor with Full Pitch Winding and Its Multi-objective Optimization Method

technical field

The invention belongs to the technical field of switched reluctance motors, and in particular relates to an axial magnetic flux switched reluctance motor with a full-pitch winding and a multi-objective optimization method thereof.

Background technique

With the rapid development of power devices and microelectronics, switched reluctance motors have attracted more and more attention in the past two or three decades. It has the advantages of simple structure, low cost, sturdy body, high reliability and wide speed regulation range. Low torque density and large torque ripple are the difficulties that switched reluctance motors need to face and solve when entering the high-performance drive field. Therefore, in order to improve the power density and torque density of the switched reluctance motor, improve the operating efficiency, and reduce the torque ripple, scholars at home and abroad have done a lot of research and achieved certain results.

Combining the switched reluctance motor with the axial magnetic field structure forms an axial flux switched reluctance motor, which has the comprehensive advantages of the switched reluctance motor and the axial magnetic field motor. The radial length of the axial flux switched reluctance motor from the outer diameter of the stator to the inner diameter of the stator is the effective area for the motor to generate torque. With proper magnetic circuit design, the stator and rotor cores can be fully utilized. Axial-flux motors are generally able to provide higher torque and power densities than comparable radial-flux motors. Axial flux switched reluctance motors with small axial lengths are particularly advantageous for low-speed, high-torque motor drives, such as direct-drive in-wheel motors.

However, traditional axial-flux switched reluctance motors adopt concentrated winding configuration, which often has a long excitation magnetic circuit, resulting in high loss and low operating efficiency. The torque output capability is not strong. The present invention therefore proposes an axial flux switched reluctance motor structure with a full pitch winding configuration, and the currents in the stator armature windings flow in opposite directions in the two back-to-back stator slots, offsetting and aligning at the misaligned positions The magnetic flux superposition effect of the position. The purpose is to use the new magnetic circuit design method of the winding configuration to enable the motor to obtain a larger maximum and minimum inductance ratio, improve the output of the motor, and also improve the power density of the motor. Compared with the traditional axial flux switched reluctance motor using concentrated windings, the full-pitch winding axial flux switched reluctance motor has a larger rated power under the same volume, and the power density and torque density are improved. It is especially suitable for low-speed high-torque applications, and can be used for in-wheel direct drive motors of electric vehicles.

At the same time, in view of the disadvantages of many design parameters of this structure and the traditional optimization method is time-consuming, a multi-objective optimization method based on the layering of design variables is proposed. High electromagnetic torque and low torque ripple can be obtained at the same time, realizing multi-objective synchronous optimization of motor performance.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an axial magnetic flux switched reluctance motor with a full-pitch winding and a multi-objective optimization method thereof, and provide a shaft with a small axial length, a short magnetic flux path, a high energy conversion rate, and a high torque density. A flux switched reluctance motor scheme and a multi-objective optimization method with short optimization time.

To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

The motor winding adopts a full-pitch winding configuration, and the winding is installed in the stator slot. The coil directions of the opposite stator slots are opposite. The rotor core adopts a block structure, and the rotor core block is fixed by the rotor disk made of magnetic isolation material. Compared with the traditional axial flux switched reluctance motor with concentrated winding configuration, the axial flux switched reluctance motor structure with full-pitch winding forms the shortest magnetic flux path on the adjacent stator poles, which increases the The output of the motor increases the torque density of the motor, reduces the loss, and improves the operation efficiency.

The invention applies the full-pitch winding configuration to the structure of the axial magnetic field switched reluctance motor to form an axial magnetic flux switched reluctance motor with a short magnetic flux path, which has a combination of the switched reluctance motor and the axial magnetic field motor. Advantage. With proper magnetic circuit design, the stator and rotor cores can be fully utilized. Axial-flux motors are generally able to provide higher torque and power densities than comparable radial-flux motors. At the same time, the axial flux switched reluctance motor with small axial length is suitable for applications that have special requirements for motor volume, such as electric vehicle in-wheel motors.

Compared with the prior art, the present invention has the following significant advantages:

1. The use of full-pitch windings and segmented rotors can obtain short magnetic flux paths between adjacent magnetic poles of the motor, which not only reduces the loss of the rotor core, but also makes the switched reluctance motor operating according to the principle of minimum magnetic flux in the magnetic circuit of the misaligned position. By canceling each other out, the misaligned flux linkage can be effectively reduced, so as to obtain a larger maximum-to-minimum inductance ratio. Compared with the traditional axial flux switched reluctance motor with concentrated winding, the rated power of the motor is larger under the same volume, and the power density and torque density are improved.

2. The pole piece structure is added to the stator tooth pole and the segmented rotor core. The use of the pole piece increases the surface area of the air gap and improves the motor torque to a certain extent.

3. The double outer stator structure is convenient for cooling and has a large heat dissipation area, which is convenient for heat circulation.

4. The inner rotor 3 has no concave and convex surface, and the annular shape has lower wind resistance and less loss than the traditional salient pole-shaped switched reluctance motor. The rotor fixing plate 303 is made of epoxy resin material that is neither magnetic nor conductive, and plays the role of isolating the magnetic circuit and reducing eddy current loss. The density of the epoxy resin material is light, which can reduce the rotational inertia of the rotor and improve the motor Dynamic response speed.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of a part of the iron core of the structure of an axial magnetic flux switched reluctance motor with a full-pitch winding according to an embodiment of the present invention;

Figure 2 (a) is a schematic diagram of the configuration of the windings of the left stator NNNSSS and the right stator SSSNNN of the motor provided along the outer diameter circumference according to an embodiment of the present invention;

Fig. 2(b) is a schematic diagram of the winding configuration of the left stator NSNSNS and the right stator SNSNSN of the motor provided along the outer diameter and circumference of the motor according to an embodiment of the present invention;

3 is a plan view of a rotor of a motor structure provided for an embodiment of the present invention;

FIG. 4( a ) is a schematic diagram of the main magnetic flux at the aligned position (maximum inductance position) of phase B of the motor provided by an embodiment of the present invention;

Fig. 4(b) is a schematic diagram of the main magnetic flux of the non-alignment position (minimum inductance position) of phase B of the motor provided by the embodiment of the present invention;

FIG. 5 is a schematic diagram of a motor assembly provided by an embodiment of the present invention;

6 is a flowchart of the multi-objective optimization method according to an embodiment of the present invention;

FIG. 7 is a comparison diagram of electromagnetic torque before and after optimization using a multi-objective optimization method according to an embodiment of the present invention.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Hereinafter, embodiments of the present invention will be described in detail, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention. It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. It will be understood that when we refer to an element as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Furthermore, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in the general dictionary should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

An embodiment of the present invention provides a full-pitch winding axial flux switched reluctance motor and a multi-objective optimization method thereof. As shown in FIG. 1 , the motor core part includes: a left stator 1 , a right stator 2 , and a rotor 3. The windings are configured as full-pitch excitation windings.

The left stator core 1 consists of a stator yoke 101, a stator pole 102, a magnetic pole piece 103, and a stator slot 104; the rotor core 3 consists of a rotor pole 301 and a magnetic pole piece 302; the structure of the right stator core 2 is the same as that of the left The side stator cores 1 are completely identical, and consist of a stator yoke 201 , a stator pole 202 , a magnetic pole piece 203 , and a stator slot 204 . Full pitch winding coils are mounted in stator slots 104 and 204 .

The double stator and the single rotor are arranged in parallel, the left stator and the right stator tooth poles are oppositely installed on both sides of the rotor disk, and an air gap is arranged in the middle.

In this embodiment, the number of poles of the single-sided stator is N _s , the number of rotors in blocks is N _r , and m is the number of motor phases. Then there are N _s =2mn, N _r =2(m-1)n, where n is a positive integer. The N _r segmented rotors are distributed at equal intervals along the circumference, and the distribution interval is 360°/N _r .

In a preferred solution of this embodiment, the axial flux switched reluctance motor is a three-phase structure of 6p/4q, wherein the number of stator poles (slots) is 6p, and the number of rotor poles is 4q, wherein p and q are both is a positive integer.

For example, as shown in Figure 1, a short magnetic circuit double stator axial flux switched reluctance motor structure with 12 slots and 8 poles is used, that is, the number of stator poles on one side is 12 and the number of rotors in blocks is 8. The present claims take the three-phase 12-slot 8-pole axial flux switched reluctance motor with 3 phases, 12 stator poles and 8 rotor poles as an example to give the structure and working principle of the motor.

In this embodiment, there are two winding polarity configurations: one is as shown in Figure 2(a), the left stator adopts the polarity configuration of NNNSSSNNNSSS (2NNNSSS), and the right stator adopts the polarity according to SSSNNNSSSNNN (2SSSNNN) Second, as shown in Figure 2(b), the left stator adopts the polarity configuration of NSNSNSNSNSNS(6NS), and the right stator adopts the polarity configuration of SNSNSNSNSNSN(6SN). The motor consists of three phases A, B, and C, and the distribution of each phase winding of the motor is shown in the figure. Figure. When the current flows in from the reference direction, that is, the current is in the positive direction, it can be marked as A+, B+ and C+. When the current flows from the reference direction, that is, the current is in the negative direction, it can be marked as A-, B- and C-.

In a preferred solution of this embodiment, the axial magnetic flux switched reluctance motor with full pitch winding adopts a winding polarity configuration of 2NNNSSS and 2SSSNNN.

Figure 3(a) is a screenshot of the rotor plane of the axial flux switched reluctance motor structure with the full-pitch winding. It can be seen that the rotor core 3 consists of 8 segmented rotors distributed at equal intervals along the circumference, and the distribution spacing is 45°. Figure 3(b) is a top view of the structure of the fixed-pitch winding axial flux switched reluctance motor at the air gap. It can be seen that 12 stator tooth poles are equally spaced along the circumference, and the stator slots adopt a parallel slot structure.

In the prior art, the excitation magnetic circuit of the axial flux switched reluctance motor is long, resulting in low excitation efficiency and increased loss. In the embodiment of the present invention, the stator core of the axial flux switched reluctance motor with the full-pitch winding is a salient pole structure in which wide poles and narrow poles alternate, the rotor core is a block structure, and the concentrated windings are wound on the wide poles of the stator. As shown in Figure 2, the polarities of the winding coils in the slots of the two sides of the stator in the same position are opposite. Due to the characteristic that only one-phase winding coils are placed in each slot, and the rotor adopts a block rotor structure, the excitation magnetic flux forms a short magnetic flux path between the adjacent stator wide poles and stator narrow poles.

Define the alignment position: define the alignment position of the stator slot centerline and the segmented rotor pole centerline as the alignment position of the motor;

Define the misalignment position: Define the alignment position of the stator slot centerline and the rotor slot centerline as the misalignment position of the motor.

FIG. 4 shows the magnetic flux path diagrams of the axial flux switched reluctance motor with the full pitch winding in the aligned position and the non-aligned position. Figure 4(a) shows the magnetic flux path at the aligned position of the motor, and Figure 4(b) shows the magnetic flux path at the non-aligned position of the motor.

It can be found that the main magnetic flux of the motor is generated by the excitation winding installed in the stator slot, and the polarity of the stator slot winding in the opposite position is opposite. The magnetic flux generated by the winding in the left stator slot starts from the left stator yoke 101, passes through the left stator pole 102, and enters the rotor block 3 through the air gap between the left stator pole 102 and the rotor block 3, and then passes through the rotor along a symmetrical path. The air gap between block 3 and the left stator pole 102 reaches the adjacent left stator pole 102 , back to the left stator yoke 101 . A closed magnetic circuit 1 is formed.

Likewise, the polarities of the stator slots are reversed due to the relative positions. The magnetic flux generated by the winding in the right stator slot starts from the left stator yoke 201, passes through the right stator pole 202, and enters the rotor block 3 through the air gap between the right stator pole 202 and the rotor block 3, and then passes through the rotor along a symmetrical path. The air gap between block 3 and the right stator pole 202 reaches the adjacent right stator pole 202 back to the right stator yoke 201 . A closed magnetic circuit 2 is formed.

In the misaligned position, the magnetic fluxes generated by the two coils cancel each other out. The flux linkage of the non-aligned position of the motor is reduced, so that the motor obtains a larger maximum and minimum inductance ratio.

As shown in FIG. 5 , the complete assembly structure of the axial magnetic flux switched reluctance motor with the full-pitch winding according to the present invention includes a left stator 1, a right stator 2, a rotor 3, a rotating shaft 4, a bearing 5, an end cover 6, Key 7, case 8. The rotor core 3 is composed of rotor teeth 301 , magnetic pole pieces 302 , and fixed disk 303 . The stator iron cores 1 and 2 and the rotor iron core 3 are both made of silicon steel sheets that are stacked in an axial direction, and the rotor fixed disk 303 is made of epoxy resin material that is neither magnetic nor conductive, so as to isolate the magnetic circuit and reduce the The role of eddy current losses.

Install the N _r rotor iron core blocks on the rotor fixing plate 303 at equal distances around the circumference, install the rotor 3 on the rotating shaft 4 through the key 8, and wind the full-pitch windings in the slots of the left stator 1 and the right stator 2. Inside, after the winding of the armature winding is completed, the left stator 1 and the right stator 2 are respectively installed on both sides of the rotor core 3 with the teeth and poles facing each other, and are mounted on the rotating shaft 4 through the bearing 5, and then the motor end cover 6 The axial direction of the bearing 5 is fixed. It is characterized in that: the full-pitch winding is installed in the stator slot, the coils in the same slot of the two stators have opposite polarities, there are pole shoes on the stator and rotor tooth poles, and the adjacent divided rotor core blocks are connected by magnetic isolation materials. A short magnetic circuit is formed between adjacent stator poles.

The invention also provides a multi-objective optimization method for the axial magnetic flux switched reluctance motor of the full-pitch winding. As shown in Figure 6, a multi-objective optimization method for optimizing parameter layers can greatly save optimization time.

The three indexes of average torque, dynamic torque ripple and average torque per unit mass are selected as optimization goals.

Determine the average torque T _avg of the motor according to the following formula:

Determine the torque ripple _Trip of the motor according to the following formula:

The motor's average torque per mass, _Tapm , is determined according to the following formula:

Among them, n is the selected number of rotor angles in the analysis process, T _i is the electromagnetic torque value of the motor at different angles; T _max is the maximum electromagnetic torque of the motor in a sampling period, and T _min is the motor in a sampling period. The minimum value of electromagnetic torque; M _fe is the quality of the motor iron core, and M _cu is the quality of the motor winding coil.

Taking the key geometrical parameters of the motor as design variables, including the rotor pole piece length l _rs , the stator pole piece length l _ss , the rotor slot width w _ro , the stator slot width w _so , the stator and rotor pole piece interval width w _sro , the rotor pole piece width length _lrp , stator pole length _{lsp, and stator yoke thickness lsy .}

Firstly, the comprehensive sensitivity index of each optimization parameter to optimization targets such as average electromagnetic torque, torque ripple and torque density is calculated. According to the size of the comprehensive sensitivity index, the optimized parameters are layered into high sensitivity parameters and low sensitivity parameters.

For the eight dimensional structural parameters of this embodiment, the rotor pole piece length l _rs , the stator pole piece length l _ss , the rotor slot width w _ro , the stator slot width w _so , the stator and rotor pole piece interval width w _sro , and the rotor pole length l The sensitivity parameters of _rp , stator pole length l _sp , and stator yoke thickness l _sy are 0.177, 0.248, 0.382, 0.344, 0.254, 0.137, 0.178 and 0.160, respectively.

Select 0.2 as the limit to distinguish high sensitivity and low sensitivity parameters, the sensitivity index greater than 0.2 is the high sensitivity parameter, and the sensitivity index less than 0.2 is the low sensitivity parameter. Therefore, in this embodiment, the stator pole piece length l _ss , the rotor slot width w _ro , the stator slot width w _so and the _stator and rotor pole piece interval width w _sro are selected as high sensitivity parameters. The pole length l _rp , the stator pole length l _sp , and the stator yoke thickness l _sy are low sensitivity parameters.

For high-sensitivity parameters, the response surface method was used to establish a surrogate model combined with a non-dominated sorting genetic algorithm (NSGA-II) for optimization. Firstly, the sampling points are determined, and the design target results under different parameter combinations are obtained by using the three-dimensional finite element method, so as to establish a two-dimensional response surface model of four high-sensitivity parameters about three optimization targets:

Then, using the NSGA-II algorithm, the optimal solution set is obtained by weighing the values of the three optimization objectives, and a set of satisfactory solutions is selected as the optimization scheme of high sensitivity parameters.

For low sensitivity parameters, the method of constructing Taguchi orthogonal matrix is used for optimization. First, determine the sampling points, and use the three-dimensional finite element method to obtain the design target results under different parameter combinations, thereby constructing four low-sensitivity parameters related to the three optimization targets. Orthogonal matrix table, and then use the mean method to obtain a set of optimal solutions As an optimization scheme for low sensitivity parameters.

Finally, the obtained high-sensitivity parameter scheme combined with the low-sensitivity parameter scheme is substituted into the finite element model of the motor to obtain the result of the design target, and compare the effect of the optimized scheme with the initial scheme.

Figure 7 is a comparison diagram of the dynamic torque waveform between the optimized scheme obtained by the method and the initial scheme. It can be seen that the method can obtain higher electromagnetic torque and torque density, and at the same time obtain smaller torque ripple, and achieve three Simultaneous optimization of each target while saving optimization time. It is suitable for the field of motor design, especially when there are many optimization parameters.

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, those skilled in the art do not need to pay creative efforts. Various modifications or deformations that can be made are still within the protection scope of the present invention.

Claims (9)

1. A switched reluctance machine with a full pitch winding and axial flux, the machine core comprising: left stator 1, rotor 2, right stator 3. Wherein, the left stator iron core 1 is composed of a stator yoke 101, a stator pole 102, a magnetic pole shoe 103 and a stator slot 104; the structure composition of the right stator core 2 is completely the same as that of the left stator core 1, and the right stator core is composed of a stator yoke 201, a stator pole 202, a magnetic pole shoe 203 and a stator slot 204; the rotor core 3 is composed of a rotor pole 301 and a magnetically permeable pole shoe 302. The field winding is a full-pitch winding with the full-pitch winding coils mounted in stator slots 104 and 204.

2. The pitch winding axial flux switched reluctance machine of claim 1, wherein: the double stators and the single rotor are arranged in parallel, and the double stators are arranged on two sides of the rotor disc in a manner of opposite teeth. For an m-phase motor, the number of stator slots is 2mn, and the number of segmented rotors is 2(m-1) n, wherein n is a positive integer.

3. The pitch winding axial flux switched reluctance machine of claim 1, wherein: the stator tooth pole and the rotor block are both provided with magnetic conduction pole shoes, wherein the left stator 1 comprises a stator pole shoe 103, the right stator 2 comprises a stator pole shoe 203, and the rotor iron core block 3 comprises a rotor pole shoe 302. The power density of the switched reluctance motor is closely related to the effective air gap area, and the arrangement of the magnetic conduction pole shoe increases the contact area of the magnetic pole, so that magnetic flux can better pass along a short magnetic flux path, and the power density of the motor is increased to a certain extent.

4. The pitch winding axial flux switched reluctance machine of claim 1, wherein: the stator slots between adjacent stator teeth are of a parallel slot configuration. That is, the stator slot widths at different radii are fixed, the stator slot width is equal to the pole arc width of the stator tooth pole at the centerline of the inner and outer diameters, while the segmented rotor pole height is twice the stator yoke height.

5. The pitch winding axial flux switched reluctance machine of claim 1, wherein: the stator pole shoe slot opening length is equal to the rotor pole shoe slot opening length, i.e. the distance between adjacent rotor segments is equal to the distance between adjacent stator teeth. This helps to reduce the permeance at misaligned locations without affecting the inductance at aligned locations.

6. The pitch winding axial flux switched reluctance machine of claim 1, wherein: unlike the concentrated winding configuration employed by the conventional switched reluctance motor winding of the doubly salient structure, the motor winding employs a full pitch winding configuration, i.e., the full pitch winding coils are installed in the stator slots 104 and 304 across the teeth, in order for the magnetic flux to be closed with the shortest magnetic path. In the stator on one side, four coils which are vertically opposite in the radial direction are mutually connected in series, and then are connected in series with the coils which are connected in series and are arranged at the same position of the stator on the other side to form one phase.

7. The switched reluctance machine of claim 1 wherein the winding coils installed in the stator slots of the opposite sides of the stator have opposite polarities in order to provide a flux canceling effect at the misaligned position.

8. The pitch winding axial flux switched reluctance machine of claim 1, in combination with claims 2-7, wherein: the adoption of the full-pitch winding and the block rotor can obtain a short magnetic flux path between adjacent magnetic poles of the motor, thereby not only reducing the loss of the rotor core, but also mutually offsetting the magnetic circuits of the switched reluctance motor which operates according to the minimum magnetic flux principle at the non-aligned position, effectively reducing the non-aligned flux linkage and further obtaining the maximum and minimum inductance ratio. The characteristic is particularly remarkable under the condition that the ampere turns of the motor are large, so that the axial flux switch reluctance motor is particularly suitable for low-speed and large-torque application and can be used for an in-wheel direct drive motor of an electric automobile.

9. The multi-objective optimization method of the integral pitch winding axial flux switched reluctance motor according to claim 1, wherein the multi-objective optimization method of the optimization parameter layering is provided because the motor has a complex structure and more size parameters, and the calculation is complex and the time consumption is longer when the traditional multi-objective optimization method is adopted. Firstly, comprehensive sensitivity indexes of all optimization parameters to optimization targets such as average electromagnetic torque, torque ripple and torque density are calculated, and the optimization parameters are layered into high-sensitivity parameters and low-sensitivity parameters according to the size of the comprehensive sensitivity indexes. And establishing a proxy model for the high-sensitivity parameters by adopting a response surface method and combining a non-dominated sorting genetic algorithm for optimization, and optimizing the low-sensitivity parameters by adopting a Taguchi orthogonal method. The method can obtain higher electromagnetic torque and torque pulsation, and simultaneously obtain smaller torque pulsation, thereby realizing synchronous optimization of multiple targets. The layered multi-objective optimization method is suitable for being used under the condition of more optimization parameters and is suitable for the design stage of the switched reluctance motor.

Images