Spline curve-based magnetic barrier tail design method for synchronous reluctance motor and synchronous reluctance motor
By optimizing the magnetic barrier tail curve of the synchronous reluctance motor using spline curve-based design methods, especially NURBS curves, the problem of insufficient design freedom was solved, and a balance between electromagnetic and mechanical performance was achieved. This improved the motor's torque ripple and stress distribution, and enhanced its reliability at high speeds.
Patent Information
- Application Number
- CN202411115087.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2044-08-14
AI Technical Summary
The design freedom of the tail curve of the magnetic barrier in existing synchronous reluctance motors is limited, resulting in insignificant improvement in motor performance, especially in terms of leakage flux, harmonic content and stress concentration.
A spline curve-based design method, particularly non-uniform rational B-spline curves (NURBS), is adopted. By optimizing control points and control variables, the tail curve of the magnetic barrier is plotted. Combined with intelligent optimization algorithms, both electromagnetic and mechanical performance are taken into account, thereby improving the degree of design freedom.
It effectively reduces torque ripple, optimizes stress distribution, improves the high-speed reliability of the motor, enhances motor performance, and provides margin for speed increases.
Smart Images
Figure CN118920943B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of synchronous reluctance motor structure design, and more particularly relates to a synchronous reluctance motor magnetic barrier tail design method based on a spline curve and a synchronous reluctance motor. BACKGROUND
[0002] According to statistics, industrial electricity accounts for about 70% of social electricity. Industrial production mainly uses electricity for motor electricity, accounting for about 70%-80% of industrial electricity. Therefore, the development of high-efficiency motors is of great significance to promote energy saving and emission reduction and realize green economic development in China.
[0003] Unlike traditional induction motors, synchronous reluctance motors do not use rare earth structures, but set magnetic barriers on the rotor to make the direct and quadrature axes of the rotor have a large difference, and then generate magnetic drag torque by the difference in the magnetic resistance of each part of the rotor. The rotor of the synchronous reluctance motor does not have a squirrel cage structure, which significantly reduces the rotor loss and improves the efficiency of the motor. Compared with traditional induction motors, the synchronous reluctance motor has lower loss, higher efficiency and torque density at the same power level, and is expected to replace traditional induction motors in many application scenarios and become the main force of the new generation of industrial motors. The design of the rotor magnetic barrier structure has a great influence on the performance of the synchronous reluctance motor. A good rotor magnetic barrier can bring better electromagnetic performance to the synchronous reluctance motor while meeting the stress indicators of the motor.
[0004] The magnetic barrier in the rotor of the synchronous reluctance motor is divided into two key parts: the magnetic barrier main body and the magnetic barrier tail. Previous studies have generally focused on the structural design of the magnetic barrier main body of the synchronous reluctance motor. For the magnetic barrier tail curve structure, the conventional magnetic barrier tail curve structure such as straight line type, circular arc type or sharp angle type is directly used. However, in fact, the magnetic barrier tail curve structure has a great influence on the magnetic leakage of the motor, the harmonic content, the stress concentration problem, and thus affects a series of performance indicators such as motor torque, power factor, torque ripple, etc. A small number of researchers have also proposed some optimization schemes for the design of the magnetic barrier tail curve, but these schemes are often limited by fixed magnetic barrier tail angles and outer magnetic bridge thicknesses, and assume that the magnetic barrier tail curve is a simple curve structure, which has limited design freedom, and the designed magnetic barrier tail curve structure has a very limited effect on the performance improvement of the synchronous reluctance motor. SUMMARY
[0005] In view of the defects and improvement needs of the prior art, the present application provides a synchronous reluctance motor magnetic barrier tail design method based on a spline curve and a synchronous reluctance motor, which aims to increase the design freedom of the magnetic barrier tail curve to design a magnetic barrier tail that can effectively improve the performance of the synchronous reluctance motor.
[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a synchronous reluctance motor magnetic barrier tail design method based on a spline curve is provided, comprising:
[0007] A coordinate system O_standard is established in the plane where the magnetic barrier is located;
[0008] In the coordinate system O_standard, five points P1, P2, P3, P4 and Top_Point are selected; P1 and P4 are located on the first tangent line and the second tangent line respectively, the first tangent line is tangent to the magnetic barrier main body at C, and the second tangent line is tangent to the magnetic barrier main body at D; Top_Point is the top point of the magnetic barrier tail curve, P2, Top_Point and P3 are located on the same straight line, and the straight line is tangent to the magnetic barrier tail curve at Top_Point; C and D are the end points on both sides of the magnetic barrier tail;
[0009] With the position of P1 on the first tangent line, the position of P4 on the second tangent line, the abscissa of P2, the abscissa of P3, the coordinates of Top_Point and the included angle θ between the line connecting P2 and P3 and the line connecting C and D as control variables, a spline curve is drawn as the magnetic barrier tail curve after the control points P1, P2, P3, P4, C, D and Top_Point are selected under different control variables, and the torque ripple and stress performance under the corresponding control variables are simulated, thereby a Pareto frontier considering torque ripple and stress performance is drawn;
[0010] A point on the Pareto frontier is selected, which meets the design target of torque ripple and stress performance, and a spline curve is drawn according to the corresponding control variables, thereby obtaining the magnetic barrier tail curve.
[0011] Further, the coordinate axis O_standard takes the line connecting the end points C and D on both sides of the magnetic barrier tail as the coordinate axis, and takes C as the origin.
[0012] In some optional embodiments, the spline curve is a non-uniform rational B-spline curve.
[0013] In some optional embodiments, the spline curve is a B-spline curve.
[0014] According to another aspect of the present application, a synchronous reluctance motor is provided, in the rotor of which, the magnetic barrier tail curve is designed by the above-mentioned synchronous reluctance motor magnetic barrier tail design method based on spline curve provided by the present application.
[0015] Further, the synchronous reluctance motor provided by the present application has a streamlined shape on both the inner side and the outer side of the magnetic barrier main body.
[0016] According to another aspect of the present application, a computer readable storage medium is provided, which includes a stored computer program, and when the computer program is executed by a processor, the computer readable storage medium controls the device where the computer readable storage medium is located to execute the above-mentioned synchronous reluctance motor magnetic barrier tail design method based on spline curve provided by the present application.
[0017] According to still another aspect of the present application, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the above-mentioned spline curve based design method of the magnetic barrier tail of a synchronous reluctance motor.
[0018] According to still another aspect of the present application, there is provided a spline curve based design system of the magnetic barrier tail of a synchronous reluctance motor, comprising a computer readable storage medium and a processor; the computer readable storage medium is configured to store a computer program; the processor is configured to read the computer program stored in the computer readable storage medium and execute the above-mentioned spline curve based design method of the magnetic barrier tail of a synchronous reluctance motor.
[0019] Overall, the above technical solutions conceived by the present application can achieve the following beneficial effects:
[0020] (1) The present application uses a spline curve to design the magnetic barrier tail curve, and a total of 7 control points including the two end points of the magnetic barrier tail are selected, which has a high control order and a high degree of design freedom. Among them, the control points P1 and P4 are located on the tangent lines tangent to the magnetic barrier main body at the two end points, thereby ensuring smooth connection between the magnetic barrier main body and the magnetic barrier tail and ensuring electromagnetic performance. The vertex Top_Point of the magnetic barrier tail curve is not determined according to the magnetic barrier tail angle and the outer magnetic bridge thickness, but is determined through optimization with the assistance of the control points P2 and P3. In this way, the design freedom is increased, and Top_Point can in turn affect the magnetic barrier tail angle and the outer magnetic bridge thickness. When performing optimization design, the present application simultaneously optimizes the electromagnetic performance of the motor and the mechanical stress of the rotor to obtain an optimal solution that takes into account both electromagnetic performance and mechanical performance, which can reduce torque ripple and optimize stress distribution, thereby improving reliability at high speed and providing a margin for increasing speed, so that the motor can attempt to break through higher speeds. Overall, the present application effectively increases the degree of freedom of magnetic barrier tail curve design and designs a magnetic barrier tail that can effectively improve the performance of a synchronous reluctance motor.
[0021] (2) In the preferred scheme of the present application, a non-uniform rational B-spline curve (NURBS curve) is specifically selected to design the magnetic barrier tail curve. The NURBS curve has the property of being differentiable at nodes, and the magnetic barrier tail curve of the synchronous reluctance motor designed using the NURBS curve is smooth and has good magnetic circuit performance. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 A schematic diagram of the spline curve based design method of the magnetic barrier tail of a synchronous reluctance motor according to the embodiments of the present application;
[0023] Figure 2A schematic diagram of a synchronous reluctance motor provided for implementation of the present application;
[0024] Figure 3 A schematic diagram of a quarter rotor integral magnetic barrier provided for implementation of the present application;
[0025] Figure 4 A performance comparison diagram of synchronous reluctance motors under different design schemes provided for embodiments of the present application;
[0026] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein:
[0027] 1 - rotor, 2 - magnetic barrier, 3 - stator. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.
[0029] In the present application, the terms "first", "second" and the like (if any) in the present application and the drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.
[0030] For the magnetic barrier tail curve structure of the synchronous reluctance motor, three points C, D and E are often known, as shown in Figure 1 , wherein C and D are the two end points of the magnetic barrier tail, i.e. the points where the magnetic barrier body and the magnetic barrier tail are connected, and the magnetic barrier body structure is obtained; E is the top point of the magnetic barrier tail, which is obtained from the predetermined magnetic barrier tail angle θ i and the outer magnetic bridge thickness trib i In order to provide a parameterized and high degree of freedom magnetic barrier tail curve structure design method to optimize the magnetic barrier tail curve structure design of the synchronous reluctance motor and thus optimize the motor performance, the present application introduces a spline curve into the magnetic barrier tail curve structure design of the synchronous reluctance motor, and regards the magnetic barrier tail curve of the synchronous reluctance motor as a curve with order p (p>2), node number m 1 (m≥3), control point number n 1 (n=m-p-1) and each control point weight w i .
[0031] Considering that the Non-Uniform Rational B-Splines (NURBS) curve has the invariance under affine and perspective transformations, and has the property of being differentiable at nodes, the tail curve of the magnetic barrier designed by the NURBS curve is smooth and has good magnetic circuit performance, therefore, the NURBS curve is preferably used to design the tail curve of the magnetic barrier. In the specific design, the intelligent optimization algorithm is combined, and the NURBS curve control points, weight values, order, node vectors and other parameters are uniformly optimized based on the motor performance requirements, so that the unconventional synchronous reluctance motor magnetic barrier tail structure has certain improvement on the average torque, torque ripple, stress and other key performances of the synchronous reluctance motor.
[0032] The definition of the p-order NURBS curve is as follows:
[0033]
[0034] Wherein, C(t) is the NURBS curve expression, N i,p (t) is the base function of the curve, P i represents the i th control point, w i represents the weight of the i th control point, and n represents the total number of control points.
[0035] More specifically, the base function N i,p (t) of the curve is defined as:
[0036]
[0037] when p>1,t∈[t p-1 ,t n+1 ]
[0038] When the weight values w i are all equal to 1, the influence of each control point on the curve is equivalent, and the NURBS curve will degenerate into a B-spline curve, and the definition of the p-order B-spline curve is as follows:
[0039]
[0040] The NURBS curve divides the line segment with known first and last end points into segments according to the node parameter vector, controls the shape of m curve segments through n+1 control points, and guarantees the G1 geometric continuity, i.e. tangent continuity or first-order differential continuity, between the curve segments through the control points, so that the highest p=m-n-1 order curve can be drawn.
[0041] When the end points of the curve are both control points and nodes, it is called a clamped NURBS curve. In this case, in order to ensure that the end nodes are controlled by only one control point (i.e. the end point itself), the node needs to increase the degree of overlap p, i.e. equivalent to p+1 nodes in m+1 nodes.
[0042] When a point in the middle of the curve is both a control point and a node, it is called a segmented NURBS curve. In this case, in order to ensure that the node is controlled by only one control point (i.e. the point itself), the node needs to increase the degree of overlap p-1, i.e. equivalent to p nodes in m+1 nodes.
[0043] Experiments have verified that the spline curve formed by the NURBS curve in the above specific case can also effectively improve the performance of the motor when used for the curve design of the tail of the magnetic barrier.
[0044] The following is an example.
[0045] Example 1
[0046] A spline curve-based design method for the tail of the magnetic barrier of a synchronous reluctance motor. In this embodiment, the curve of the tail of the magnetic barrier of the synchronous reluctance motor is described using a NURBS curve with a degree of 3 for practical application of the spline curve, because a NURBS curve with a higher degree can be spliced from a low-order spline curve under the condition of meeting the continuity requirement, and the corresponding number of nodes and control points can be increased accordingly.
[0047] As shown in Figure 1 , the embodiment specifically includes:
[0048] First, a coordinate system is established at the tail of the magnetic barrier. Specifically, in order to reduce the complexity of subsequent calculations, in this embodiment, the line connecting the end points C and D of the tail of the magnetic barrier is used as the coordinate axis, and the coordinate system O_standard is established in the plane of the magnetic barrier with C as the origin. Optionally, in the established coordinate system O_standard, the coordinates of C are (0, 0) and the coordinates of D are (2, 0); the tangent line at C tangent to the main body of the magnetic barrier has an expression of x=0; and the tangent line at D tangent to the main body of the magnetic barrier has an expression of x=2.
[0049] After that, in the coordinate system O_standard, five points P1, P2, P3, P4 and Top_Point are selected, which will be used as control points of the NURBS together with the end points C and D. Among them, P1 and P4 are located on the first tangent line and the second tangent line respectively, the first tangent line is tangent to the magnetic barrier body at C, and the second tangent line is tangent to the magnetic barrier body at D. By selecting the control points P1 and P4 on the tangent lines tangent to the magnetic barrier body at the two end points, the smooth connection of the magnetic barrier body and the magnetic barrier tail can be ensured, and the magnetic circuit performance of the motor can be ensured; the point Top_Point is the vertex of the magnetic barrier tail curve, P2, Top_Point and P3 are located on the same straight line, and the straight line is tangent to the magnetic barrier tail curve at Top_Point. Unlike the existing magnetic barrier tail curve design scheme, the magnetic barrier vertex E determined according to the preset magnetic barrier tail angle and the outer magnetic bridge thickness is not directly used as the vertex of the magnetic barrier tail curve in this embodiment, but is determined by optimization with the assistance of control points P2 and P3, which increases the degree of freedom of the magnetic barrier tail curve design. At the same time, Top_Point can in turn affect the magnetic barrier tail angle and the outer magnetic bridge thickness, further increasing the design freedom of the overall motor.
[0050] Considering the actual engineering needs, the magnetic barrier tail curve of the synchronous reluctance motor is described by a segmented clamped NURBS curve with 11 nodes, 7 control points and 3 orders, wherein the curve is clamped by the two end nodes C and D and segmented by the vertex Top_Point of the magnetic barrier tail curve, the overlap degree of the first and last nodes in the node vector is 4, and the overlap degree of the middle nodes is 3, which can be expressed as [0, 0, 0, 0, t, t, t, 1, 1, 1, 1]. The control points P1, P2, P3 and P4 are described by coordinates (0, y1), (x2, y2), (x3, y3) and (2, y4), and the vertex Top_Point of the magnetic barrier tail curve is described by (x T , y T ). The five points together with the two points C and D control the shape of the curve. Among them, the abscissas of P1 and P4 are 0 and 2 respectively, which are located on the tangent lines at C and D respectively, ensuring the smooth connection of the two curve segments and the magnetic barrier body. In some other embodiments of the present application, other spline curves can also be selected.
[0051] In order to ensure smooth connection between the two curve segments, the selection of P2 and P3 needs to satisfy that P2, Top_Point, P3 are located on the same straight line, and the straight line is tangent to the tail curve of the magnetic barrier at Top_Point. In order to reduce the complexity of subsequent optimization calculation, as a preferred embodiment, the embodiment uses a variable θ to represent the included angle between the connecting line between P2 and P3 and the connecting line between C and D. At this time, the y2 and y3 coordinates of P2 and P3 are non-independent variables and have no actual effect, and can not be optimized separately in the optimization process. Compared with directly using the horizontal and vertical coordinates of P2 and P3 as control variables, the embodiment reduces one control variable by introducing the included angle θ, greatly reduces the calculation complexity in the subsequent optimization process, is conducive to reducing the optimization difficulty, and improves the optimization efficiency.
[0052] Therefore, the tail curve structure of the magnetic barrier is controlled by y1, x2, x3, y4, θ, x T , y T 7 variables.
[0053] It should be noted that increasing the design freedom will increase the complexity of the optimization design. If the design freedom is not high enough, the tail curve of the magnetic barrier cannot be effectively optimized. If the design freedom is too high, it will be difficult to obtain the optimal solution due to the high complexity, and it cannot be applied to practice. The embodiment determines the control points in the above manner, which can ensure that the tail of the magnetic barrier is smoothly connected with the main body of the magnetic barrier, and each part of the tail curve of the magnetic barrier is also smoothly connected. This is the key to ensuring that the electromagnetic performance is improved. At the same time, through the above processing, the finally determined control variable is 7, which is within the range of normal optimization solution, and ensures the practical feasibility of the optimization scheme.
[0054] Based on the above analysis, in the embodiment, the specific way of optimizing and designing the tail curve of the magnetic barrier based on the control points and the control variables includes: taking the position of P1 on the first tangent, the position of P4 on the second tangent, the horizontal coordinate of P2, the horizontal coordinate of P3, the coordinates of Top_Point, and the included angle θ between the connecting line of P2 and P3 and the connecting line of C and D as control variables. After drawing the NURBS curve as the tail curve of the magnetic barrier with P1, P2, P3, P4, C, D, and Top_Point as control points under different control variables, the torque ripple and stress performance under the corresponding control variables are simulated, the torque ripple is minimized, and the maximum stress on the tail of the magnetic barrier is minimized. The Pareto frontier considering torque ripple and stress performance is drawn.
[0055] In the traditional magnetic barrier design scheme, only the breakthrough of electromagnetic performance is usually considered, and whether the mechanical performance meets the basic requirements is usually verified only after the optimization of electromagnetic performance is completed, so as to ensure that the mechanical performance can meet the requirements while the electromagnetic performance is optimized. However, the mechanical performance is not usually optimized.
[0056] However, with the continuous development of synchronous reluctance motors, the pursuit of reliability at high speed has gradually become an urgent demand for synchronous reluctance motors. The embodiment simultaneously considers electromagnetic performance and mechanical performance to obtain an optimal solution that takes both into account, can reduce torque ripple and optimize stress distribution, is conducive to improving reliability at high speed, and provides a margin for speed increase so that the motor can attempt to break through higher speeds.
[0057] In addition, in the embodiment, the position of the vertex Top_Point(x T ,y T ) of the magnetic barrier tail curve can be freely adjusted, which will correspondingly cause changes in the magnetic barrier tail angle and the thickness of the outer magnetic bridge, which may also lead to changes in the mechanical performance of the rotor. The embodiment simultaneously optimizes the electromagnetic performance of the motor and the mechanical stress of the rotor, can directly obtain an optimal solution that takes both into account, avoids the influence of changes in the magnetic barrier tail angle and the thickness of the outer magnetic bridge on the performance of the motor, and avoids the process of multiple electromagnetic performance optimization-mechanical performance verification, which is conducive to improving the efficiency of magnetic barrier tail design.
[0058] Finally, a point on the Pareto frontier that meets the design target for torque ripple and stress performance is selected, and a spline curve is drawn according to the corresponding control variable to obtain the magnetic barrier tail curve.
[0059] Overall, the embodiment designs the magnetic barrier tail curve structure based on NURBS curves, greatly improves the degree of freedom of design while ensuring the smoothness of the curve, realizes the design of the magnetic barrier tail curve structure of the unconventional synchronous reluctance motor, and can effectively suppress rotor torque ripple and optimize stress distribution.
[0060] Embodiment 2:
[0061] A synchronous reluctance motor, as shown in Figure 2 , includes a rotor 1 and a stator 3 outside the rotor 1. As shown in Figure 2 and Figure 3 , the rotor 1 includes three layers of magnetic barriers 2, and the magnetic barrier tail curve is designed by the synchronous reluctance motor magnetic barrier tail design method based on spline curves provided in the above embodiment 1, and the main body of the magnetic barrier 2 in the rotor 1 is streamlined on the inside and outside.
[0062] Since the magnetic barrier tail curve in the embodiment is designed by the synchronous reluctance motor magnetic barrier tail design method based on spline curves provided in the above embodiment 1, the electromagnetic performance (torque ripple) and mechanical performance (stress distribution) of the motor can be effectively improved.
[0063] Optionally, the synchronous reluctance motor provided in the embodiment is a three-layer magnetic barrier synchronous reluctance motor, and the main parameters are shown in Table 1.
[0064] Table 1 main parameters of synchronous reluctance motor
[0065]
[0066] Optionally, in the magnetic barrier tail curve design, the optimization of the control variable uses a non-dominated genetic algorithm, the population number is 50, and the corresponding Pareto front is obtained after running for 100 generations. It should be noted that in other embodiments, other optimization algorithms can also be used to complete the optimization of the control variable.
[0067] The performance simulation results of the synchronous reluctance motor provided in this embodiment are shown in Table 2.
[0068] Table 2 motor simulation results
[0069] Performance indicator / Unit Value Average torque / Nm 15.89 Torque ripple / % 10.54 Efficiency / % 87.93 Maximum stress (5400 rpm) / MPa 200.98
[0070] The unconventional magnetic barrier tail curve structure designed based on the NURBS curve in this embodiment has an average torque of 15.89 Nm, a torque ripple of 10.54%, and a maximum stress of 200.98 MPa.
[0071] To further verify the performance of the synchronous reluctance motor provided in this embodiment, synchronous reluctance motors based on conventional linear, circular, and sharp corner magnetic barrier tail structures are used as a comparison, and the performances of various synchronous reluctance motors are simulated under the condition that the main structural parameters are the same. When the conventional linear magnetic barrier tail curve structure is used, the motor has an average torque of 15.49 Nm, a torque ripple of 22.91%, and a maximum stress of 216.16 MPa; when the conventional circular magnetic barrier tail curve structure is used, the motor has an average torque of 15.93 Nm, a torque ripple of 13.26%, and a maximum stress of 238.28 MPa; and when the conventional sharp corner magnetic barrier tail curve structure is used, the motor has an average torque of 15.94 Nm, a torque ripple of 14.67%, and a maximum stress of 256.38 MPa. Based on the above simulation results, compared with the conventional linear magnetic barrier tail structure synchronous reluctance motor in this embodiment, the average torque is almost unchanged while the torque ripple is reduced by 53.99% and the maximum stress is reduced by 7.02%; compared with the conventional circular magnetic barrier tail structure synchronous reluctance motor in this embodiment, the average torque is almost unchanged while the torque ripple is reduced by 20.51% and the maximum stress is reduced by 15.65%; compared with the conventional sharp corner magnetic barrier tail structure synchronous reluctance motor in this embodiment, the average torque is slightly improved while the torque ripple is reduced by 28.15% and the maximum stress is reduced by 21.61%.
[0072] The performance comparison of the motor using the spline curve described and designed by the present application to describe and design the magnetic barrier tail curve structure of the synchronous reluctance motor and the motor using three conventional synchronous reluctance motor magnetic barrier tail curve structures is as followsFigure 4 The magnetic barrier tail curve structure of the synchronous reluctance motor designed by the spline curve is shown. Figure 4 It can also be seen that the torque ripple of the magnetic barrier tail curve structure of the synchronous reluctance motor designed by the spline curve is greatly improved compared with the conventional magnetic barrier tail curve structure, the stress distribution is also improved, and there is no loss of torque size, which is of great significance for improving the electromechanical performance of the synchronous reluctance motor and expanding its application.
[0073] Embodiment 3:
[0074] A computer readable storage medium comprising a stored computer program, the computer program being executed by a processor to control the device where the computer readable storage medium is located to perform the spline curve based magnetic barrier tail design method of the synchronous reluctance motor provided in Embodiment 1.
[0075] Embodiment 4:
[0076] A computer program product comprising a computer program, the computer program being executed by a processor to implement the spline curve based magnetic barrier tail design method of the synchronous reluctance motor provided in Embodiment 1.
[0077] Embodiment 5:
[0078] A spline curve based magnetic barrier tail design system of a synchronous reluctance motor, comprising a computer readable storage medium and a processor; the computer readable storage medium is used to store a computer program; the processor is used to read the computer program stored in the computer readable storage medium, and execute the spline curve based magnetic barrier tail design method of the synchronous reluctance motor provided in Embodiment 1.
[0079] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A spline curve based synchronous reluctance machine barrier tail design method, characterized in that, The method comprises: establishing a coordinate system O_standard in the plane where the magnetic barrier is located; in the coordinate system O_standard, selecting five points: P1, P2, P3, P4 and Top_Point; P1 and P4 are located on the first tangent line and the second tangent line respectively, the first tangent line is tangent to the main body of the magnetic barrier at C, and the second tangent line is tangent to the main body of the magnetic barrier at D; Top_Point is the top point of the tail curve of the magnetic barrier, P2, Top_Point and P3 are located on the same straight line, and the straight line is tangent to the tail curve of the magnetic barrier at Top_Point; C and D are the end points on both sides of the tail of the magnetic barrier; using the position of P1 on the first tangent line, the position of P4 on the second tangent line, the abscissa of P2, the abscissa of P3, the coordinates of Top_Point, and the included angle θ between the line connecting P2 and P3 and the line connecting C and D as control variables, drawing a spline curve as the tail curve of the magnetic barrier under different control variables with P1, P2, P3, P4, C, D and Top_Point as control points, and then performing joint simulation on the torque ripple and stress performance under the corresponding control variables, thereby drawing a Pareto frontier that takes into account the torque ripple and stress performance; selecting a point on the Pareto frontier that meets the design target for torque ripple and stress performance, and drawing a spline curve according to the corresponding control variables to obtain the tail curve of the magnetic barrier.
2. The spline curve based synchronous reluctance machine barrier tail design method of claim 1, wherein, The coordinate axis O_standard takes the line connecting the end points C and D on both sides of the tail of the magnetic barrier as the coordinate axis and takes C as the origin.
3. A synchronous reluctance motor, characterized in that, The rotor of the synchronous reluctance motor, wherein the tail curve of the magnetic barrier is designed by the spline curve-based synchronous reluctance motor magnetic barrier tail design method of claim 1 or 2.
4. The synchronous reluctance machine of claim 3, wherein, The rotor of the synchronous reluctance motor, wherein the inner and outer sides of the main body of the magnetic barrier are streamline-shaped.
5. A computer-readable storage medium, characterized in that, The computer program is stored in the computer readable storage medium, and when executed by a processor, controls the device where the computer readable storage medium is located to execute the spline curve-based synchronous reluctance motor magnetic barrier tail design method of claim 1 or 2.
6. A computer program product, characterised in that, The computer program is executed by a processor to implement the spline curve-based synchronous reluctance motor magnetic barrier tail design method of claim 1 or 2.
7. A system for designing a magnetic barrier tail of a synchronous reluctance machine based on a spline curve, characterized in that, The computer readable storage medium is used to store the computer program, and the processor is used to read the computer program stored in the computer readable storage medium to execute the spline curve-based synchronous reluctance motor magnetic barrier tail design method of claim 1 or 2.