Reluctance rotor design method based on streamline magnetic barrier and motor

Abstract

The invention discloses a reluctance rotor design method based on a streamline magnetic barrier and a motor, and belongs to the field of synchronous reluctance motors, a reluctance rotor comprises a magnetic barrier main body, a low-magnetic-conductance tail part and a separated magnetic island, and the design method comprises the following steps: drawing the streamline magnetic barrier main body according to the direction of a magnetic line of force of a d-axis magnetic field by taking increase of d-axis inductance and reduction of q-axis inductance as targets; in order to reduce the magnetic flux leakage of the rotor and reduce the influence on a d-axis magnetic circuit at the same time, the tail part of the magnetic barrier is subjected to narrow opening design, and the endpoint of the magnetic barrier main body and the endpoint of the magnetic barrier tail part are connected through a straight line or an arc to form a low-magnetic-permeability magnetic barrier tail curve; taking all design parameters of the rotor as optimization variables, selecting proper optimization targets and constraint conditions, establishing an optimization problem, and solving the optimization problem to obtain optimal design parameters; and selecting a new material or process mode to realize the integrity of the rotor, and completing the design of the reluctance motor based on the streamline magnetic barrier. According to the invention, the dq-axis reluctance difference can be increased, the salient pole ratio is improved, and the torque output capability of the synchronous reluctance motor is improved.

Description

Technical Field

[0001] This invention belongs to the field of synchronous reluctance motors, and more specifically, relates to a reluctance rotor design method and motor with streamlined magnetic barriers. Background Technology

[0002] High-efficiency and energy-saving motors are key equipment for promoting energy structure transformation and achieving energy conservation and emission reduction goals. As the core power source in industrial production and social life, motors account for a high proportion of total social energy consumption. Improving the energy conversion efficiency of motors is of great practical significance for reducing energy consumption.

[0003] Synchronous reluctance motors, due to their independence from rare-earth permanent magnet materials, simple structure, and high efficiency, are increasingly showing promise in industrial drives, new energy fields, and other areas, becoming an important alternative to traditional high-energy-consuming motors. They primarily rely on... dq The difference in magnetic reluctance along the shaft magnetic circuit achieves torque output. Streamlined magnetic barrier reluctance motors are considered to be currently... dq The synchronous reluctance motor exhibits the largest difference in magnetic reluctance along its shaft and the highest salient pole ratio. However, to ensure the rotor's mechanical strength, a magnetic bridge structure is required to maintain the integrity of the iron core. This leads to a serious magnetic leakage problem: the magnetic flux bypass at the magnetic bridge weakens the magnetic flux. dq The difference in shaft reluctance leads to a decrease in the salient pole ratio, which directly restricts the improvement of reluctance torque, resulting in lower motor output torque and power density, limiting its application in high-torque and high-power-density scenarios.

[0004] To reduce magnetic leakage from magnetic bridges, researchers have proposed new processes and materials, including: directly opening up the magnetic barrier and fixing each layer of magnetic islands with bolts or sleeves; using material splicing techniques to replace the material at the magnetic bridge with a non-magnetic material; and using two-phase magnetic materials to directly demagnetize areas with magnetic leakage. The topologies obtained by these methods are all electromagnetically bridge-free structures, meaning the magnetic permeability at the tail of the magnetic barrier is close to that of air. However, while this structure reduces magnetic leakage from the magnetic bridge, it introduces a cogging effect, leading to… d Increased shaft magnetic reluctance and torque pulsation result in very limited performance improvement. Summary of the Invention

[0005] To address the shortcomings and improvement needs of existing technologies, this invention provides a reluctance rotor design method and motor based on streamlined magnetic barriers, aiming to increase... d Simultaneously reduce shaft inductance q The shaft inductance increases the salient pole ratio, thereby enhancing the torque output capability of the synchronous reluctance motor.

[0006] To achieve the above objectives, according to one aspect of the present invention, a reluctance rotor design method based on streamlined magnetic barriers is provided, comprising: alongd The direction of the magnetic field lines of the axial magnetic field is used to draw the inner and outer curves of the streamlined magnetic barrier body, making... d The axial magnetic field can pass through the rotor without any obstruction; the intersections of the inner and outer curves of the magnetic barrier body with the outer contour of the rotor are respectively and ; Indicates the number of magnetic barrier layers. n Indicates the total number of magnetic barrier layers; Endpoints of the magnetic barrier body are respectively set on the inner and outer curves of the magnetic barrier body. and In the arc The upper part is equipped with the tail end point of the magnetic barrier. and From point , , and Connect them sequentially to form the tail curve of the magnetic barrier; A multi-parameter, multi-objective optimization problem is established, with optimization variables including the thickness of each magnetic barrier, the thickness of each magnetic island, and... , , and The position is determined, and the optimization objective is the preset motor performance index. The multi-parameter multi-objective optimization problem is solved, and the Pareto front is plotted based on the solution results. The scheme that best matches the target performance requirements is selected from the front, and the reluctance rotor design based on streamlined magnetic barriers is completed.

[0007] Furthermore, the optimization variables for multi-parameter, multi-objective optimization problems also include: the tail point of the magnetic barrier. In the arc The position above; Furthermore, the tail point of the magnetic barrier Located on the arc Up, the tail point of the magnetic barrier Located on the arc superior.

[0008] Furthermore, the magnetic barrier tail point In the arc The position on is determined by the variable. Control, point In the arc The position on is determined by the variable. Control, point In the arc The position on is determined by the variable. Control, and , , satisfy:

[0009]

[0010]

[0011] in, , , , and Representing points in the polar coordinate system , , , and The polar angle.

[0012] Furthermore, and They are connected by an arc tangent to the outer curve of the main body of the magnetic barrier. and They are connected by an arc tangent to the inner curve of the main body of the magnetic barrier; or, and Between, and and All are connected by straight lines, and the point The position on the outer curve of the magnetic barrier body passes through a point that is concentric with the outer contour of the rotor. radius of the circle Control, point The position on the inner curve of the magnetic barrier body passes through a point that is concentric with the outer contour of the rotor. radius of the circle control.

[0013] Furthermore, the drawing of the inner or outer curve of the magnetic barrier body includes: The isocurrent function line on which the target curve lies is determined based on the thickness of the magnetic barrier and the magnetic island. According to the isostream function lines Determine the target curve at q Plot the points on the target curve along the streamline direction, ensuring that all points on the target curve are simultaneously located on the isostream function lines. and equipotential function superior; The target curve is either the inner curve or the outer curve; the potential function The expression is as follows:

[0014] r and θ These are the polar radius and polar angle in polar coordinates. D riIt is the inner diameter of the rotor; p is the number of pole pairs of the motor; const1 is the stream function value of each point on the target curve calculated based on the magnetic barrier thickness and the magnetic island thickness.

[0015] Furthermore, the thickness of each magnetic island The thickness of each magnetic barrier layer satisfies:

[0016]

[0017] in, Indicates the first The thickness of the magnetic island layer, Indicates the rotor outer diameter, Indicates the insulation ratio. Indicates the first Average air gap magnetic flux density within the magnetic island layer; and They represent the first Layer and first The thickness of the magnetic barrier, and They represent the first Layer and first Magnetic potential difference of the magnetic barrier.

[0018] According to another aspect of the invention, a reluctance rotor based on a streamlined magnetic barrier is provided, comprising: n The magnetic barriers are layered, and each layer of magnetic barriers is designed by the reluctance rotor design method based on streamlined magnetic barriers provided by this invention. in, n It is a preset positive integer.

[0019] In some alternative embodiments, the rotor laminations are made of a two-phase magnetic material, with the magnetic barrier portion being a non-magnetic phase and the remaining portion being a magnetic phase.

[0020] In some alternative embodiments, the rotor laminations are made of a two-phase magnetic material, the main body of the magnetic barrier is air, the tail of the magnetic barrier is a non-magnetic phase, and the rest is a magnetic phase.

[0021] In some optional embodiments, each layer of magnetic islands is made of soft magnetic material, and the rotor also includes a sheath made of two-phase magnetic material; the sheath and each layer of magnetic islands are provided with matching fixing structures; the part where the sheath connects to the magnetic island is the magnetically conductive phase, and the part in contact with the magnetic field is the non-magnetically conductive phase.

[0022] In some alternative embodiments, each layer of magnetic islands is made of soft magnetic material, and the rotor also includes an end plate disposed on the axial end face, with each layer of magnetic islands fixed by the end plate.

[0023] According to another aspect of the present invention, a synchronous reluctance motor based on streamlined magnetic barriers includes a synchronous reluctance motor rotor based on streamlined magnetic barriers provided by the present invention. According to another aspect of the present invention, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the synchronous reluctance motor design method based on streamlined magnetic barriers provided by the present invention.

[0024] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects: (1) This invention provides a design method for a streamlined magnetic barrier body, specifically, along d The direction of the magnetic field lines of the axial magnetic field is used to draw the inner and outer curves of the streamlined magnetic barrier body, making... d The axial magnetic field can pass through the rotor without any obstruction, thus maximizing the magnetic barrier curve. d Shaft inductance and minimization q Shaft inductance; further, a narrow-mouth design is implemented for the magnetic barrier tail, determining the endpoints of the magnetic barrier body and the magnetic barrier tail, connecting these points to form a low-permeability magnetic barrier tail curve; finally, an optimization problem is established for all rotor design parameters and solved to obtain the optimal design parameters, ultimately achieving increased... dq The purpose is to improve the difference in shaft inductance, increase the salient pole ratio, and enhance the torque output capability.

[0025] (2) The present invention uses the magnetic barrier tail point to determine the two endpoints of the magnetic barrier tail, which can prevent the magnetic barrier tails from crossing and further ensure the performance of the motor; in its further preferred embodiment, respectively set , , Used to control the tail point of the magnetic barrier In the arc Position, point In the arc Position and point on In the arc By positioning the variables in the solution, the number of variables in the optimization problem can be reduced while ensuring sufficient design freedom, thereby effectively reducing the difficulty of solving the optimization problem and improving the efficiency of solving it.

[0026] (3) In this invention, when using a straight line to connect the end point of the main body of the magnetic barrier and the end point of the tail of the magnetic barrier, a variable is introduced. and Used for control points Location and points on the outer curve of the magnetic barrier body The position on the inner curve of the magnetic barrier body allows for a further reduction in the number of variables in the optimization problem to be solved, thereby reducing the difficulty of solving the optimization problem and improving the efficiency of solving it, while ensuring sufficient design freedom.

[0027] (4) This invention provides an automatic calculation method for the design of magnetic barrier and magnetic island thickness, which can further reduce the difficulty of solving optimization problems and improve the efficiency of solving problems. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the reluctance rotor design method based on streamlined magnetic barriers provided in Embodiment 1 of the present invention.

[0029] Figure 2 This is a schematic diagram of the reluctance rotor design method based on streamlined magnetic barriers provided in Embodiment 2 of the present invention.

[0030] Figure 3 This is a 1 / 4 model diagram of a dual-phase magnetic material sheathed high salient pole ratio synchronous reluctance motor provided in Embodiment 3 of the present invention.

[0031] Figure 4 This is a 1 / 4 model diagram of a solid high salient pole ratio synchronous reluctance motor made of two-phase magnetic materials provided in Embodiment 4 of the present invention.

[0032] Figure 5 This is a three-dimensional structural diagram of a high salient pole ratio synchronous reluctance motor based on a connector, provided in Embodiment 5 of the present invention.

[0033] Figure 6 This is a 1 / 4 model diagram of a dual-phase magnetic material hollow high salient pole ratio synchronous reluctance motor provided in Embodiment 6 of the present invention.

[0034] Figure 7 This is a 1 / 4 model diagram of the conical magnetic barrier tail synchronous reluctance motor provided in Embodiment 7 of the present invention.

[0035] Figure 8 The magnetic field lines and magnetic density cloud diagrams at the maximum torque per ampere (MTPA) point of the motor provided in Embodiment 7 of the present invention.

[0036] Figure 9 This is a 1 / 4 model diagram of a traditional synchronous reluctance motor with a magnetic bridge, along with the magnetic field lines and magnetic density cloud diagram at the MTPA point.

[0037] Figure 10 This is a magnetic field line and magnetic density cloud diagram of a traditional synchronous reluctance motor with a magnetic bridge.

[0038] Figure 11 This is a 1 / 4 scale model of a traditional non-magnetic bridge synchronous reluctance motor.

[0039] Figure 12 The magnetic field lines and magnetic density cloud diagrams for the MTPA point of a traditional non-magnetic bridge synchronous reluctance motor.

[0040] Figure 13 The diagram shows a quarter-scale model of the arc-shaped magnetic barrier tail synchronous reluctance motor provided in Embodiment 8 of the present invention, along with the magnetic field lines and magnetic density cloud diagram of the MTPA point.

[0041] Figure 14 The magnetic field lines and magnetic density cloud diagram of the motor provided in Embodiment 8 of the present invention.

[0042] In all the accompanying drawings, the same reference numerals are used to denote the same structures or elements, wherein: 1, 2, and 3 all denote magnetic barriers. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0044] In this invention, the terms "first," "second," etc. (if present) in the invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0045] In order to increase the synchronous reluctance motor dq By addressing the difference in magnetic circuit along the shaft and increasing the salient pole ratio, the torque output capability of the synchronous reluctance motor is improved. This invention provides a reluctance rotor design method and motor based on streamlined magnetic barriers. The overall idea is as follows: d The design of the streamlined magnetic barrier body is based on the direction of the magnetic field lines along the axis, and the design freedom of the tail curves of each layer of magnetic barriers is increased to achieve greater flexibility. dq The purpose is to improve shaft inductance, increase salient pole ratio, and enhance torque output capability.

[0046] Without loss of generality, the following embodiments will be described using a three-layer magnetic barrier as an example. Furthermore, for the motor structure, only a 1 / 4 scale model of the corresponding structure will be shown.

[0047] The following is an example.

[0048] Example 1: A reluctance rotor design method based on streamlined magnetic barriers, such as Figure 1 As shown, it includes: First, the streamlined magnetic barrier body is drawn according to the fluid equations, specifically including: along d The direction of the magnetic field lines of the axial magnetic field is used to draw the inner and outer curves of the streamlined magnetic barrier body, making... d The axial magnetic field can pass through the rotor without any obstruction.

[0049] It's easy to understand that the inner side is defined as the side closer to the rotating shaft, and the outer side is defined as the side closer to the air gap. Indicates the number of magnetic barrier layers, for the th The laminar streamline magnetic barrier has inner and outer curves that are similar to those of the main body. q The intersection points of the axes are respectively and Magnetic barrier thickness Defined as The length of each magnetic barrier's outer magnetic island (i.e., the first...) Thickness of the magnetic island Defined as Length, Indicates the outer contour line of the rotor and q The intersection of the axes.

[0050] In this embodiment, the main body curve of the magnetic barrier is designed to be streamlined, so that... d Magnetic field lines around a cylinder can be considered as an inviscid, incompressible fluid, and can be expressed using a stream function. Summation potential function To describe, in the context of d In a polar coordinate system with the x-axis as the polar axis, the stream function Summation potential function The expressions are as follows:

[0051] in, and These are the polar radius and polar angle in polar coordinates; D ri It is the inner diameter of the rotor; p It refers to the number of pole pairs of the motor. Isocurrent function lines. With equipotential function lines Mutually orthogonal (const1 and const2 both represent constants), for a streamline, each point The value is unique and fixed. The value monotonically increases along the streamline. Based on this, in this embodiment, when plotting the inner and outer curves of a certain magnetic barrier layer, the value is determined by... The value determines its position. q The position of the axis is determined by The function determines the points at the remaining positions on the streamline, and connecting these points sequentially draws the streamlined magnetic barrier body. Taking the outer curve of the magnetic barrier body as an example, the outer curve of the magnetic barrier body... The values ​​are equal. The value increases monotonically, therefore the curve on the outer side of the magnetic barrier body... Take a certain number of points evenly distributed between the values ​​and connect them in parallel to form the stream function. Summation potential function Obtain the polar coordinates of these points, connect them sequentially, and use... qThe axis is copied to the other side as the axis of symmetry, thus drawing the outer curve of the magnetic barrier body. The inner curve is drawn in the same way as the outer curve, and will not be repeated here. This embodiment draws the inner and outer curves of the magnetic barrier body based on the potential function, which makes it easier to control the distribution of points on each streamline and the drawn points are more uniform.

[0052] The inner and outer curves of the streamlined magnetic barrier and q Intersection of axes B i and A i The thickness of the magnetic island w fei and magnetic barrier thickness t bi Determine the thickness of each magnetic barrier layer during calculation. t bi And the thickness of the magnetic island w fei You can specify the requirements directly according to the design needs. In this case, you need to enter 2. n 1 variable ( n (Indicates the number of magnetic barrier layers); To further improve the optimization effect on motor performance, as a preferred implementation method, this embodiment maximizes... d Shaft inductance and minimization q The principle of axial inductance proposes an automatic method for calculating the thickness of magnetic islands. w fei and magnetic barrier thickness t bi In this way, the thickness of each magnetic island... The thickness of each magnetic barrier layer satisfies:

[0053] in, Indicates the first The thickness of the magnetic island layer, Indicates the rotor outer diameter, Indicates the insulation ratio. Indicates the first Average air gap magnetic flux density within the magnetic island layer; and They represent the first Layer and first The thickness of the magnetic barrier, and They represent the first Layer and first Magnetic potential difference of the magnetic barrier. k air , B avgi and The expressions are as follows:

[0054] in, For the first i Layer magnetic barrier tail and q The included angle of the axis; B d for d Axial magnetic flux density amplitude; F q for q Amplitude of the axial magnetomotive force.

[0055] Based on the above-mentioned automatic calculation method, this embodiment requires input. k air and magnetic barrier tail horn The value of , the number of input variables is reduced to n +1. The thickness of each magnetic barrier layer was calculated. t bi And the thickness of the magnetic island w fei And the rotor inner diameter parameters can determine the inner and outer curves of the magnetic barrier body. q Intersection of axes B i and A i Furthermore, the points that can be calculated according to formula (1) are obtained. A i and B i Corresponding equicurrent function lines The value of , combined with the potential function, allows for the plotting of the corresponding curve. The intersections of the inner and outer curves of the magnetic barrier body with the outer contour line of the rotor are denoted as points 1 and 2, respectively. and points .

[0056] After completing the drawing of the inner and outer curves of the magnetic barrier body, this embodiment further designed the tail curve of the magnetic barrier. Therefore, this embodiment needs to determine the endpoints of the magnetic barrier body on the inner and outer curves of the magnetic barrier body respectively. and and in the arc The corresponding determination of the tail end point of the magnetic barrier and ,Depend on , , and The components are connected sequentially to form the magnetic barrier tail curve. The magnetic barrier tail designed in this embodiment is a low-permeability magnetic barrier tail. and Between, and and Any line type can be used to connect them; optionally, in this embodiment, and Between, and and All of them are connected by straight lines, thus forming a conical magnetic barrier tail.

[0057] To prevent the magnetic barrier tails from crossing, as a preferred embodiment, this example further... The magnetic barrier tail point is defined above. ,point Curve Divided into two sections, making Located on the arc superior, Located on the arc superior.

[0058] Based on the above-described drawing of the main body and tail of the magnetic barrier, this embodiment further establishes a multi-parameter, multi-objective optimization problem. The optimization variables of this multi-parameter, multi-objective optimization problem include: the thickness of each magnetic barrier, the thickness of each magnetic island, and... , , , and The position is optimized with the preset motor performance indicators as the target; optionally, in this embodiment, the preset motor performance indicators specifically include the average torque, torque ripple and efficiency of the motor. It should be noted that in other embodiments of the present invention, other motor performance indicators can also be set according to the actual working requirements of the motor.

[0059] By solving the above multi-objective, multi-parameter optimization problem, multiple sets of solutions can be obtained. Each set of solutions corresponds to a set of motor design parameters that meet the motor performance requirements. Finite element method software and corresponding optimization algorithms can be used for solving the problem. In this embodiment, after obtaining multiple sets of solutions, a Pareto front is plotted based on the solution results. The scheme that best matches the target performance requirements is selected to complete the design of the reluctance rotor based on streamlined magnetic barriers. Finally, the three-layer magnetic barrier designed in this embodiment is as follows: Figure 1 As shown, magnetic barrier 1, magnetic barrier 2 and magnetic barrier 3 represent the first magnetic barrier, the second magnetic barrier and the third magnetic barrier, respectively.

[0060] To ensure sufficient design freedom to effectively optimize motor performance while reducing the difficulty of solving the optimization problem, this embodiment introduces some variables to control the solution of certain optimization variables. Specifically, when determining the endpoints of the magnetic barrier body... and At that time, for the tail of the conical magnetic barrier, point The position on the outer curve of the magnetic barrier body passes through a point that is concentric with the outer contour of the rotor. radius of the circle Control, point The position on the inner curve of the magnetic barrier body passes through a point that is concentric with the outer contour of the rotor. radius of the circle control.

[0061] For the tail curve of the magnetic barrier, the tail point of the magnetic barrier In the arc The specific position on is determined by the variable To control, satisfy:

[0062] in, , and Representing points in the polar coordinate system ,point and points The polar angle. When it is 0, Point located at point, When it is 1, Point located at point; Secondly, determine the point. and ,point and All are located on the outer contour of the rotor, among which, point Located on the arc Up, point Located on the arc Similarly, for ease of determination and At the optimal position on the corresponding arc, variables are introduced respectively. and ; satisfy:

[0063] in, Represents the lower point in the polar coordinate system The polar angle; When it is 0, Point located at E i On, When it is 1, The point is located at point superior; satisfy:

[0064] in, Represents the lower point in the polar coordinate system The polar angle; When it is 0, D exi Point located at E i On, When it is 1, D exi Point located at D jigsawi Click on it; Confirm, connect with straight lines respectively. and Parametric modeling of a synchronous reluctance motor based on streamlined magnetic barriers was completed.

[0065] Overall, this embodiment uses streamline equations to draw the main body curve of the magnetic barrier and designs the tail curve of the magnetic barrier. The design parameters include the main body design parameters and the tail design parameters of the magnetic barrier, which greatly increases the degree of freedom in rotor design and is beneficial for increasing... dq Poor shaft inductance and increased salient pole ratio improve the output performance of the motor.

[0066] Example 2: A reluctance rotor design method based on streamlined magnetic barriers, such as Figure 2 As shown. This embodiment is similar to Embodiment 1 above, except that in this embodiment, the endpoints of the magnetic barrier body are determined. and Its position is obtained by solving equations; specifically, and They are connected by an arc tangent to the inner curve of the magnetic barrier body. and The components are connected by an arc tangent to the outer curve of the main magnetic barrier, thus the designed synchronous reluctance motor based on the streamlined magnetic barrier has an arc-shaped magnetic barrier tail. Ultimately, the three-layer magnetic barrier designed in this embodiment is as follows: Figure 2 As shown, magnetic barrier 1, magnetic barrier 2 and magnetic barrier 3 represent the first magnetic barrier, the second magnetic barrier and the third magnetic barrier, respectively.

[0067] In this embodiment, the specific implementation methods of the remaining steps can be referred to the description in Embodiment 1 above, and will not be repeated here.

[0068] In this embodiment, and Between, and and All are connected by arcs tangent to the curves on both sides of the magnetic barrier body; therefore, in combination... and Location, and The location can be obtained by solving equations. In this embodiment, due to the point... and The position is calculated from the tangent constraint conditions, without requiring parameters. t obi and t ibi Compared to Example 1, it reduced by 2 n The addition of variables increases the degree of freedom in rotor design. Applying this to the design of the magnetic barrier tail of a synchronous reluctance motor is beneficial for improving the salient pole ratio and motor output performance while reducing the number of variables in the optimization problem to be solved, effectively reducing the difficulty of solving the optimization problem and improving the solution efficiency.

[0069] Example 3: A synchronous reluctance motor rotor based on streamlined magnetic barriers. For example... Figure 3 As shown, this embodiment includes three layers of magnetic barriers, and each layer of magnetic barriers is designed by the reluctance rotor design method based on streamlined magnetic barriers provided in Embodiment 1 above.

[0070] The synchronous reluctance motor rotor provided in this embodiment is a two-phase magnetic material sheath type high salient pole ratio synchronous reluctance motor rotor, wherein each layer of magnetic islands is made of traditional soft magnetic material, and the rotor also includes a sheath made of two-phase magnetic material; the sheath and each layer of magnetic islands are provided with matching fixing structures; the part where the sheath is connected to the magnetic island is the magnetically conductive phase, and the part in contact with the magnetic field is the non-magnetically conductive phase.

[0071] like Figure 3 As shown, in order to stably fix the separated magnetic islands, in this embodiment, the two-phase magnetic material sheath is T-shaped in the unipolar configuration, including a first extension located on the outer contour of the rotor and distributed circumferentially and a second extension distributed radially; the contact portion with the magnetic island made of soft magnetic material is provided with a matching tenon / mortise structure to fix and support the magnetic island made of conventional soft magnetic material; the part of the two-phase magnetic material connected to the magnetic barrier is set as a non-magnetic phase.

[0072] Example 4: A synchronous reluctance motor rotor based on streamlined magnetic barriers. For example... Figure 4 As shown, this embodiment includes three layers of magnetic barriers, and each layer of magnetic barriers is designed by the reluctance rotor design method based on streamlined magnetic barriers provided in Embodiment 1 above.

[0073] The synchronous reluctance motor provided in this embodiment is a dual-phase magnetic material quasi-solid low leakage synchronous reluctance motor rotor. The rotor as a whole is made of dual-phase magnetic material to form a quasi-solid structure. The magnetic island part is set as the magnetically conductive phase, and the magnetic barrier part is set as the non-magnetically conductive phase.

[0074] Example 5: A synchronous reluctance motor rotor based on streamlined magnetic barriers. For example... Figure 5As shown, this embodiment includes three layers of magnetic barriers, and each layer of magnetic barriers is designed by the reluctance rotor design method based on streamlined magnetic barriers provided in Embodiment 1 above.

[0075] The synchronous reluctance motor rotor provided in this embodiment is a high salient pole ratio synchronous reluctance motor rotor based on connectors. In addition to the mutually separated magnetic islands, it also includes end plates located at both ends of the rotor axis to provide fixation and support for the magnetic islands. Specifically, in this embodiment, holes are drilled in the separated magnetic islands of the rotor and connectors are inserted. The magnetic barriers are not filled with any material. The connectors are used to fix the magnetic islands and rotor end plates together, thereby achieving fixation and support of the high salient pole ratio reluctance motor rotor structure.

[0076] Example 6: A synchronous reluctance motor rotor based on streamlined magnetic barriers. For example... Figure 6 As shown, this embodiment includes three layers of magnetic barriers, and each layer of magnetic barriers is designed by the reluctance rotor design method based on streamlined magnetic barriers provided in Embodiment 1 above.

[0077] The synchronous reluctance motor provided in this embodiment is a hollow, low-leakage synchronous reluctance motor rotor made of two-phase magnetic material. The rotor laminations are made of two-phase magnetic material, the main body of the magnetic barrier is air, the tail of the magnetic barrier is a non-magnetic phase, and the remaining part is a magnetic phase. The non-magnetic tail of the magnetic barrier forms a magnetic bridge structure, which ensures the integrity of the laminations.

[0078] Example 7: A synchronous reluctance motor based on streamlined magnetic barriers, such as Figure 7 As shown, the rotor includes a rotor and a stator on the outer side of the rotor. The rotor includes three layers of magnetic barriers; the rotor is designed using the synchronous reluctance motor rotor design method based on streamlined magnetic barriers provided in Embodiment 1 above. Therefore, the synchronous reluctance motor provided in this embodiment is a synchronous reluctance motor with a conical magnetic barrier tail.

[0079] Optionally, the conical magnetic barrier tail synchronous reluctance motor provided in this embodiment is specifically a three-layer magnetic barrier synchronous reluctance motor, and its main parameters are shown in Table 1. In subsequent optimization designs, the parameters shown in Table 1 remain unchanged.

[0080]

[0081] To demonstrate the effectiveness of the embodiments of the present invention, corresponding reference synchronous reluctance motors with magnetic bridges and through-barrier (without external magnetic bridge) synchronous reluctance motors are provided, with structures as follows: Figure 9 and Figure 11 As shown, the main parameters are the same as those in Table 1.

[0082] Since the optimal magnetic shielding layer and magnetic barrier thickness are different for the three types of synchronous reluctance motors, in order to fully demonstrate the effectiveness of the present invention, multi-parameter and multi-objective optimizations were performed respectively, with all rotor design parameters as optimization parameters and maximizing efficiency, maximizing electromagnetic torque and minimizing torque ripple as optimization objectives.

[0083] The main parameters of the conical magnetic barrier tail synchronous reluctance motor rotor provided in this embodiment are shown in Table 2; the main parameters of the reference magnetic bridge synchronous reluctance motor rotor are shown in Table 3; and the main parameters of the through magnetic barrier synchronous reluctance motor rotor are shown in Table 4.

[0084]

[0085]

[0086]

[0087] The operating conditions of the above motor are: effective current 3.5A, speed 3000rpm; Figure 8 These are the magnetic field lines and magnetic density cloud diagrams at the MTPA (maximum torque-to-current ratio) point of the conical magnetic barrier tail synchronous reluctance motor provided in this embodiment of the invention; Figure 10 These are the magnetic field lines and magnetic density cloud diagrams of the MTPA point of the aforementioned reference synchronous reluctance motor with magnetic bridge; Figure 12 These are the magnetic field lines and magnetic density cloud diagrams of the MTPA point of the above-mentioned through-magnetic barrier synchronous reluctance motor. It can be seen from the comparison that the leakage flux of the conical magnetic barrier tail synchronous reluctance motor provided in this embodiment is significantly reduced, indicating that the rotor salient polarity of this application example is improved, which is beneficial to the improvement of output torque.

[0088] Table 5 shows a comparison of the simulation performance results of this embodiment with the benchmark synchronous reluctance motor with magnetic bridge and the benchmark through-type synchronous reluctance motor. Based on the results in Table 5, it can be seen that the synchronous reluctance motor with conical magnetic barrier tail provided in this embodiment has the highest saliency ratio. Compared with the benchmark synchronous reluctance motor with magnetic bridge, the saliency ratio is increased by 49.48%, the output torque is increased by 11.11%, and the output power is increased by 11.33%. Compared with the through-type synchronous reluctance motor, the saliency ratio is increased by 11.88%, the output torque is increased by 6.06%, and the output power is increased by 6.11%. In other words, the reluctance rotor design method based on streamlined magnetic barriers adopted in this embodiment has a good effect on improving the motor magnetic circuit, increasing the motor output torque, and energy conversion efficiency.

[0089]

[0090] In addition, it should be noted that increasing the salient pole ratio improves the motor power factor, effectively suppresses the rise in line voltage, reduces the motor's demand on controller capacity, and further reduces the production and operating costs of the entire system.

[0091] Example 8: A synchronous reluctance motor based on streamlined magnetic barriers, such as Figure 13 As shown, the rotor includes a rotor and a stator on the outer side of the rotor. The rotor includes three layers of magnetic barriers; the rotor is designed using the synchronous reluctance motor rotor design method based on streamlined magnetic barriers provided in Embodiment 2 above. Therefore, the synchronous reluctance motor provided in this embodiment is a synchronous reluctance motor with an arc-shaped magnetic barrier tail.

[0092] Optionally, the arc-shaped magnetic barrier tail synchronous reluctance motor provided in this embodiment is specifically a three-layer magnetic barrier synchronous reluctance motor, and its main parameters are shown in Table 1 above. To demonstrate the effectiveness of this embodiment, [further details are needed]. Figure 9 The reference synchronous reluctance motor with magnetic bridge shown and Figure 11 The through-barrier synchronous reluctance motor shown is used for comparison, and its main parameters are also shown in Table 1 above.

[0093] The arc-shaped magnetic barrier tail synchronous reluctance motor and the reference motor provided in this embodiment have undergone multi-parameter and multi-objective optimization of rotor parameters. The main parameters of the rotor of the reference magnetic bridge synchronous reluctance motor are shown in Table 3 above, the main parameters of the rotor of the through magnetic barrier synchronous reluctance motor are shown in Table 4 above, and the main parameters of the rotor of the arc-shaped magnetic barrier tail synchronous reluctance motor provided in this embodiment are shown in Table 6.

[0094]

[0095] The operating conditions of the above motor are: effective current 3.5A, speed 3000rpm; Figure 14 The magnetic field lines and magnetic density cloud diagrams of the MTPA point of the arc-shaped magnetic barrier tail synchronous reluctance motor provided in this embodiment of the invention are, in conjunction with... Figure 10 and Figure 12 The results show that, compared with the reference synchronous reluctance motor with magnetic bridge and the synchronous reluctance motor with through magnetic barrier, the leakage flux of the synchronous reluctance motor with arc-shaped magnetic barrier tail in this embodiment is significantly reduced, indicating that the rotor salient polarity of this embodiment is improved, which is beneficial to the improvement of output torque.

[0096] Table 7 shows a comparison of the simulation performance results of different motors. It can be seen that the arc-shaped magnetic barrier tail synchronous reluctance motor provided in this embodiment has the highest saliency ratio. Compared with the reference synchronous reluctance motor with magnetic bridge, the saliency ratio is increased by 48.85%, the output torque is increased by 10.71%, and the output power is increased by 10.86%. Compared with the through magnetic barrier synchronous reluctance motor, the saliency ratio is increased by 11.41%, the output torque is increased by 5.68%, and the output power is increased by 5.67%. These results fully demonstrate that the reluctance rotor design method based on streamlined magnetic barriers adopted in this embodiment has a good effect on improving the motor magnetic circuit, increasing the motor output torque, and improving energy conversion efficiency.

[0097]

[0098] Furthermore, it is noted that the increase in salient pole ratio improves the motor power factor, effectively suppressing the rise in line voltage, reducing the motor's demand on controller capacity, and further reducing the production and operating costs of the entire system. It can also be observed that the torque ripple of the arc-shaped magnetic barrier tail synchronous reluctance motor is lower than that of the conical magnetic barrier tail synchronous reluctance motor.

[0099] Example 9: A computer program product includes a computer program that, when executed by a processor, implements the synchronous reluctance motor rotor design method based on streamlined magnetic barriers provided in Embodiment 1 or 2 above.

[0100] Example 10: A computer-readable storage medium includes a stored computer program that, when executed by a processor, implements the synchronous reluctance motor rotor design method based on streamlined magnetic barriers provided in Embodiment 1 or 2 above.

[0101] Example 11: A synchronous reluctance motor rotor design system based on streamlined magnetic barriers includes: A computer-readable storage medium for storing computer programs; And a processor for reading a computer program stored in a computer-readable storage medium to implement the synchronous reluctance motor rotor design method based on streamlined magnetic barriers provided in Embodiment 1 or 2 above.

[0102] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present 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.

Claims

1. A design method for a reluctance rotor based on streamlined magnetic barriers, characterized in that, include: along d The direction of the magnetic field lines of the axial magnetic field is used to draw the inner and outer curves of the streamlined magnetic barrier body, making... d The axial magnetic field can pass through the rotor without any obstruction; the intersections of the inner and outer curves of the magnetic barrier body with the outer contour of the rotor are respectively and ; Indicates the number of magnetic barrier layers. n Indicates the total number of magnetic barrier layers; Endpoints of the magnetic barrier body are respectively set on the inner and outer curves of the magnetic barrier body. and In the arc The upper part is equipped with the tail end point of the magnetic barrier. and From point , , and Connect them sequentially to form the tail curve of the magnetic barrier; A multi-parameter, multi-objective optimization problem is established, with optimization variables including the thickness of each magnetic barrier, the thickness of each magnetic island, and... , , and The position is determined, and the optimization objective is the preset motor performance index; the multi-parameter multi-objective optimization problem is solved, and the Pareto front is plotted based on the solution results. The scheme that best matches the target performance requirements is selected from the front, and the reluctance rotor design based on streamlined magnetic barriers is completed.

2. The reluctance rotor design method based on streamlined magnetic barriers as described in claim 1, characterized in that, The optimization variables for the multi-parameter, multi-objective optimization problem also include: the magnetic barrier tail point. In the arc The position above; Furthermore, the tail point of the magnetic barrier Located on the arc Up, the tail point of the magnetic barrier Located on the arc superior.

3. The reluctance rotor design method based on streamlined magnetic barriers as described in claim 2, characterized in that, magnetic barrier tail point In the arc The position on is determined by the variable. Control, point In the arc The position on is determined by the variable. Control, point In the arc The position on is determined by the variable. Control, and , , satisfy: in, , , , and Representing points in the polar coordinate system , , , and The polar angle.

4. The reluctance rotor design method based on streamlined magnetic barriers as described in claim 3, characterized in that, and They are connected by an arc tangent to the outer curve of the main body of the magnetic barrier. and They are connected by an arc tangent to the inner curve of the main body of the magnetic barrier; or, and Between, and and All are connected by straight lines, and the point The position on the outer curve of the magnetic barrier body passes through a point that is concentric with the outer contour of the rotor. radius of the circle Control, point The position on the inner curve of the magnetic barrier body passes through a point that is concentric with the outer contour of the rotor. radius of the circle control.

5. The reluctance rotor design method based on streamlined magnetic barriers as described in any one of claims 1 to 4, characterized in that, The drawing of the inner or outer curve of the magnetic barrier includes: The isocurrent function line on which the target curve lies is determined based on the thickness of the magnetic barrier and the magnetic island. According to the isostream function lines Determine the target curve in q Plot the points on the target curve along the streamline direction, ensuring that all points on the target curve are simultaneously located on the isostream function lines. and equipotential function superior; Wherein, the target curve is an inner curve or an outer curve; the potential function The expression is as follows: r and θ These are the polar radius and polar angle in polar coordinates. D ri It is the inner diameter of the rotor; p is the number of pole pairs of the motor; const1 is the stream function value of each point on the target curve calculated based on the magnetic barrier thickness and the magnetic island thickness.

6. The reluctance rotor design method based on streamlined magnetic barriers as described in claim 5, characterized in that, Thickness of each magnetic island The thickness of each magnetic barrier layer satisfies: in, Indicates the first The thickness of the magnetic island layer, Indicates the rotor outer diameter, Indicates the insulation ratio. Indicates the first Average air gap magnetic flux density within the magnetic island layer; and They represent the first Layer and first The thickness of the magnetic barrier, and They represent the first Layer and first Magnetic potential difference of the magnetic barrier.

7. A reluctance rotor based on streamlined magnetic barriers, characterized in that, include n The magnetic barriers are layered, and each layer of magnetic barriers is designed by the reluctance rotor design method based on streamlined magnetic barriers as described in any one of claims 1 to 6. in, n It is a preset positive integer.

8. The reluctance rotor based on streamlined magnetic barriers as described in claim 7, characterized in that, The rotor laminations are made of a two-phase magnetic material, with the magnetic barrier portion being a non-magnetic phase and the remaining portion being a magnetic phase; Alternatively, the rotor laminations are made of a two-phase magnetic material, with the main body of the magnetic barrier being air, the tail of the magnetic barrier being a non-magnetic phase, and the remaining part being a magnetic phase; Alternatively, each layer of magnetic islands is made of soft magnetic material, and the rotor also includes a sheath made of two-phase magnetic material; the sheath and each layer of magnetic islands are provided with matching fixing structures; the part where the sheath connects to the magnetic island is the magnetically conductive phase, and the part in contact with the magnetic field is the non-magnetically conductive phase; Alternatively, each layer of magnetic islands may be made of soft magnetic material, and the rotor may also include an end plate disposed on the axial end face, through which each layer of magnetic islands may be fixed.

9. A synchronous reluctance motor based on streamlined magnetic barriers, characterized in that, Including the synchronous reluctance motor rotor based on streamlined magnetic barriers as described in claim 7 or 8.

10. A computer program product, characterized in that, The system includes a computer program that, when executed by a processor, implements the synchronous reluctance motor design method based on streamlined magnetic barriers as described in any one of claims 1 to 6.

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