Design method and system of v-shaped built-in high-speed permanent magnet rotor containing multi-separation magnetic bridge

Abstract

The application discloses a design method and system of a V-shaped built-in high-speed permanent magnet rotor containing multiple magnetic isolation bridges, and comprises the following steps: obtaining stress analytical relations of a central magnetic isolation bridge, an intermediate magnetic isolation bridge and two side magnetic isolation bridges according to structural characteristics of the magnetic isolation bridges, geometric characteristics of pole shoe regions, force balance equations of the magnetic isolation bridges, geometric coordination conditions, material physical equations and load forms; performing calculation and analysis based on the stress analytical relations to obtain design parameters of the intermediate magnetic isolation bridge and stress variation laws of the central magnetic isolation bridge, the intermediate magnetic isolation bridge and the two side magnetic isolation bridges; and determining optimal design parameters of the intermediate magnetic isolation bridge based on the stress variation laws. The five-magnetic-isolation-bridge V-shaped permanent magnet rotor is adopted, the width direction of the intermediate magnetic isolation bridge is perpendicular to the pole shoe surface of the rotor at the position of the intermediate magnetic isolation bridge, the mechanical strength of the permanent magnet rotor structure is remarkably improved, and the maximum operating speed of the permanent magnet rotor is further improved.

Description

Technical Field

[0001] This invention belongs to the field of high-speed motor technology, and more specifically, relates to a design method and system for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges. Background Technology

[0002] Built-in high-speed permanent magnet motors are highly favored in new energy vehicle drive systems due to their advantages such as high power density, small size and weight, and strong overload capacity. However, the enormous centrifugal force generated by high-speed rotation acts on the small magnetic isolation bridge of the permanent magnet rotor, which can easily cause structural damage to the bridge. Increasing the thickness of the magnetic isolation bridge can improve its mechanical strength, but it will lead to increased rotor leakage flux and reduced electromagnetic performance of the motor. Therefore, improving the rotor's mechanical strength without increasing the thickness of the magnetic isolation bridge is crucial for the safe operation of the motor.

[0003] The V-type built-in high-speed permanent magnet motor rotor structure typically includes two magnetic isolation bridges close to the rotor surface (i.e., side magnetic isolation bridges). To further increase the operating speed of the built-in permanent magnet motor, a magnetic isolation bridge (i.e., a central magnetic isolation bridge) is usually added at the symmetrical position of the two permanent magnets distributed in a V-shape in the permanent magnet rotor structure. This is a typical V-type permanent magnet rotor structure with three magnetic isolation bridges.

[0004] Patent CN114759702A discloses a new type of high-speed permanent magnet motor with a rotor structure. It adopts a built-in "V" type motor design, with "H" type reinforcing ribs embedded in the magnetic ribs on the side of the main magnetic bridge and the auxiliary magnetic bridge. This reduces magnetic leakage while ensuring that the positions of the main and auxiliary magnetic bridges meet the requirements of mechanical strength and electromagnetic performance, maximizing the thinness. However, it still cannot meet the strength requirements at higher operating speeds.

[0005] The existing V-type permanent magnet rotor magnetic bridge structure design has the following shortcomings: (1) The mechanical strength of the V-type permanent magnet rotor with three magnetic bridge structures still cannot meet the strength requirements at higher operating speeds. (2) There is a lack of a design method for a V-type permanent magnet rotor with higher mechanical strength. Summary of the Invention

[0006] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a design method and system for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges. The V-shaped permanent magnet rotor with five magnetic bridges ensures that the width direction of the middle magnetic bridge is perpendicular to the surface of the rotor pole shoe at its location, significantly improving the mechanical strength of the permanent magnet rotor structure and thus increasing its maximum operating speed.

[0007] To achieve the above objectives, according to one aspect of the present invention, a design method for a V-shaped built-in high-speed permanent magnet rotor containing multiple magnetic bridges is provided, comprising the following steps:

[0008] S100: Based on the structural characteristics of the magnetic isolation bridge, the geometric characteristics of the pole shoe region, the force balance equation of the magnetic isolation bridge, the geometric compatibility conditions, the material physics equations and the load form, the stress analytical relationship of the central magnetic isolation bridge, the middle magnetic isolation bridge and the two side magnetic isolation bridges is obtained.

[0009] S200: Based on the stress analysis relationship, calculations and analyses are performed to obtain the design parameters of the middle magnetic bridge and the stress variation law of the central magnetic bridge, the middle magnetic bridge and the two side magnetic bridges;

[0010] S300: Determine the optimal design parameters of the intermediate magnetic bridge based on the stress variation law.

[0011] Further, S100 includes:

[0012] S1100: Divide the pole shoe region and obtain the centrifugal force acting on the magnetic isolation bridge and permanent magnet.

[0013] Furthermore, S100 also includes:

[0014] S1200: Establish the force balance equation of the magnetic isolation bridge, determine the geometric compatibility conditions and material physics equations, and jointly solve the force on the magnetic isolation bridge.

[0015] Furthermore, the S100 further includes:

[0016] S1300: Based on the load form and the force on the magnetic isolation bridge, the design parameters of the middle magnetic isolation bridge and the stress relationship between the central magnetic isolation bridge, the middle magnetic isolation bridge and the magnetic isolation bridges on both sides are obtained.

[0017] Further, S1100 specifically includes:

[0018] Based on the structural characteristics of the magnetic isolation bridge, the pole shoe region is divided into multiple regions that are symmetrical about the rotor circumference;

[0019] Based on the geometric characteristics of the region, the equivalent centroid of the rotor structure is obtained;

[0020] Based on the geometric characteristics of the region, the equivalent centroid of the permanent magnet is obtained;

[0021] Based on the obtained equivalent centroid of the rotor structure and the equivalent centroid of the permanent magnet, the centrifugal force acting on the permanent magnet is determined.

[0022] Furthermore, S1200 specifically includes:

[0023] Establish the force balance equation between the central magnetic isolation bridge, the middle magnetic isolation bridge, and the two side magnetic isolation bridges, that is, the sum of the forces on the central magnetic isolation bridge, the middle magnetic isolation bridge, and the two side magnetic isolation bridges is balanced with the centrifugal force acting on the permanent magnet.

[0024] The deformations of the central magnetic bridge, the middle magnetic bridge, and the two magnetic bridges are obtained based on the forces on the central magnetic bridge, the middle magnetic bridge, and the two magnetic bridges, and the geometric coordination conditions among the central magnetic bridge, the middle magnetic bridge, and the two magnetic bridges are established.

[0025] Based on the force balance equations and geometric compatibility conditions among the forces on the central magnetic bridge, the intermediate magnetic bridge, and the two side magnetic bridges, the analytical relationships between the forces on the central magnetic bridge, the intermediate magnetic bridge, and the two side magnetic bridges and the structural dimensional parameters are obtained.

[0026] Further, S1300 specifically includes: obtaining the analytical relationship between the stress of the central magnetic bridge, the stress of the intermediate magnetic bridge, and the stress of the two side magnetic bridges and the structural dimension parameters, and the load form of the magnetic bridges, based on the analytical relationship between the stress of the central magnetic bridge, the stress of the intermediate magnetic bridge, and the stress of the two side magnetic bridges and the structural dimension parameters of each magnetic bridge.

[0027] Furthermore, the design parameters include the width direction angle of the intermediate magnetic bridge.

[0028] Furthermore, the width direction angle of the optimal intermediate magnetic bridge is 0°, such that the width direction of the intermediate magnetic bridge is perpendicular to the surface of the rotor pole shoe at its location.

[0029] According to a second aspect of the present invention, a design system for a V-shaped built-in high-speed permanent magnet rotor containing multiple magnetic bridges is provided, comprising:

[0030] The stress acquisition module is used to obtain the stress analytical relationship of the central magnetic bridge, the middle magnetic bridge and the two side magnetic bridges based on the structural characteristics of the magnetic bridge, the geometric characteristics of the pole shoe region, the force balance equation of the magnetic bridge, the geometric compatibility conditions, the material physics equations and the load form.

[0031] The calculation and analysis module is used to perform calculations and analyses based on the stress analytical relationship to obtain the design parameters of the intermediate magnetic bridge and the stress variation law of the central magnetic bridge, the intermediate magnetic bridge and the two side magnetic bridges;

[0032] The optimal selection module is used to determine the optimal design parameters of the intermediate magnetic bridge based on the stress variation law.

[0033] According to a third aspect of the present invention, a non-transitory computer-readable storage medium is provided, the non-transitory computer-readable storage medium storing computer instructions that cause the computer to implement the method described herein.

[0034] According to a fourth aspect of the present invention, an electronic terminal is provided, comprising:

[0035] At least one processor, at least one memory, a communication interface, and a bus; wherein,

[0036] The processor, memory, and communication interface communicate with each other through the bus;

[0037] The memory stores program instructions that can be executed by the processor, which calls the program instructions to implement the method.

[0038] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0039] 1. The method of the present invention employs a multi-magnetic-bridge structure, divides the pole shoe region, obtains the centrifugal force acting on the magnetic-bridge and permanent magnet, establishes the force balance equation of the magnetic-bridge, determines the geometric compatibility conditions and material physics equations, the loading form of the magnetic-bridge, summarizes the magnetic-bridge stress, and obtains the design parameters of the middle magnetic-bridge and the stress variation law of the central magnetic-bridge, the middle magnetic-bridge, and the two side magnetic-bridges through calculation and analysis, and determines the optimal design parameters of the middle magnetic-bridge.

[0040] 2. Compared with the typical three-barrier V-type permanent magnet rotor and the five-barrier V-type permanent magnet rotor with non-optimal design parameters (β = 15°), the method of the present invention, under the same other structural parameters, has a maximum permissible speed of approximately 34,600 r / min without considering the safety factor. This represents an increase of 44.2% and 33.1% in the maximum permissible speed of the rotors of the previous two schemes, respectively.

[0041] 3. The method of the present invention, based on the stress relationship of the magnetic isolation bridge, calculates and analyzes the design parameters of the intermediate magnetic isolation bridge and the stress variation law of the central magnetic isolation bridge, the intermediate magnetic isolation bridge and the two side magnetic isolation bridges, determines the optimal design parameters of the intermediate magnetic isolation bridge, and uses the finite element simulation analysis method to determine that the stress of the magnetic isolation bridge of the five magnetic isolation bridge V-type permanent magnet rotor obtained with the optimal design parameters is smaller, thus verifying the effectiveness and reliability of the method of the present invention.

[0042] 4. The method of the present invention uses a V-shaped permanent magnet rotor with five magnetic bridges. As long as the width direction of the middle magnetic bridge is perpendicular to the surface of the rotor pole shoe at its location, the mechanical strength of the permanent magnet rotor structure can be significantly improved, thereby increasing its maximum operating speed. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a design method for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to an embodiment of the present invention.

[0044] Figure 2 This invention relates to a multi-magnetic-bridge V-shaped built-in permanent magnet rotor structure.

[0045] Figure 3This is a definition and partition diagram of the V-type built-in rotor structure in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the force analysis of the permanent magnet and pole shoe region in an embodiment of the present invention;

[0047] Figure 5 This illustrates the variation trend of magnetic bridge stress with the direction angle of the width of the intermediate magnetic bridge in an embodiment of the present invention.

[0048] Figure 6 This is the trend of the stress of the magnetic bridge with rotational speed under the same structural parameters in the embodiments of the present invention. Figure 6 (a) is a typical three-bar magnetic bridge permanent magnet rotor. Figure 6 (b) is a five-barrier permanent magnet rotor with β = 15°. Figure 6 (c) is a five-barrier permanent magnet rotor with β = 0°;

[0049] Figure 7 This is a stress distribution cloud diagram of a V-shaped permanent magnet rotor under the same conditions in an embodiment of the present invention, wherein... Figure 7 (a) represents a typical three-bar magnetic bridge permanent magnet rotor. Figure 7 (b) represents a five-barrier permanent magnet rotor with β = 15°. Figure 7 (c) represents a five-barrier permanent magnet rotor with β = 0°;

[0050] Figure 8 This illustrates the variation trend of the deformation of the magnetic bridge with the direction angle of the width of the intermediate magnetic bridge in an embodiment of the present invention.

[0051] Figure 9 This is an example of the trend of force on the magnetic bridge varying with the width and direction angle of the intermediate magnetic bridge in an embodiment of the present invention. Detailed Implementation

[0052] 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.

[0053] like Figure 2The diagram shows a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges (five magnetic bridges) according to the present invention. When the rotor rotates at high speed, the enormous centrifugal force generated by the permanent magnets and pole shoes is mainly borne by the five magnetic bridges (central magnetic bridge, two intermediate magnetic bridges, and two side magnetic bridges). In the design method of the present invention, the following assumptions are made: only high-speed centrifugal force is considered, ignoring the effects of electromagnetic force and thermal stress on the rotor; when performing force analysis on the rotor during steady-state operation, the influence of instantaneous disturbance forces is ignored; the influence of motor vibration on rotor strength is ignored; the deformation at the central bridge is assumed to be tensile deformation, and the deformation at the side bridges is assumed to be bending deformation; the force direction of the intermediate bridge is perpendicular to the width direction of the permanent magnets.

[0054] Example 1:

[0055] like Figure 1 As shown, an embodiment of the present invention provides a design method for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges, comprising:

[0056] S100: Based on the structural characteristics of the magnetic isolation bridge, the geometric characteristics of the pole shoe region, the force balance equation of the magnetic isolation bridge, the geometric compatibility conditions, the material physics equations, and the load form, the stress analytical relationship of the central magnetic isolation bridge, the intermediate magnetic isolation bridge, and the two side magnetic isolation bridges is obtained.

[0057] Specifically, S100 includes:

[0058] S1100: The pole shoe region is divided, and the centrifugal force acting on the magnetic bridge and permanent magnet is obtained. Specifically, such as... Figure 3 and 4 As shown, the pole shoe region is divided into three areas: annular F1, arc-shaped F2, and trapezoidal F3. There is a first permanent magnet M1 and a second permanent magnet M2. The width of the central magnetic isolation bridge is a1, and its height is b1; the widths of the two side magnetic isolation bridges are a2, and their heights are b2; the width of the middle magnetic isolation bridge is a3, and its height is b3. The width of the first permanent magnet is bm1, the width of the second permanent magnet is bm2, the height of the first and second permanent magnets is hm, the tip length of the permanent magnet is c1, the width of the rectangle between the first and second permanent magnets is c2, the total length of the permanent magnets is lc, the central angle corresponding to the rotor pole shoe region is α, the V-angle θ formed by the width directions of the two permanent magnets is θ, the outer radius of the rotor is R0, and the radius of the magnetic isolation bridge is R. i The width direction angle of the intermediate magnetic bridge is β; since the rotor structure is symmetrical about the y-axis, its equivalent centroid is located on the y-axis, that is:

[0059]

[0060] Among them: A F1 A F2 A F3The areas of the three regions corresponding to the annular F1, the arc F2, and the trapezoidal F3 are respectively:

[0061]

[0062]

[0063]

[0064] Similarly, the equivalent center of mass of a permanent magnet also lies on the y-axis, that is...

[0065]

[0066] Among them: A M1 A M2 These represent the areas corresponding to the first and second permanent magnets, respectively:

[0067]

[0068]

[0069] Based on the obtained equivalent centroid of the rotor structure and the equivalent centroid of the permanent magnet, the centrifugal force acting on the permanent magnet is determined, that is, the centrifugal force generated by the permanent magnet and the pole shoe region is...

[0070] F = ρ F y F L a ω 2 (A F1 +A F2 +A F3 )+2ρ M L a ω 2 (A M1 y M1 +A M2 y M2 (8)

[0071] Where, ρ F and ρ M The densities of the pole shoes and permanent magnets are respectively, L a ω is the axial length of the rotor, and ω is the rotor speed.

[0072] S1200: Establish the force balance equations for the magnetic isolation bridge, determine the geometric compatibility conditions and material physics equations, and jointly solve for the forces acting on the magnetic isolation bridge. For example... Figure 4 As shown, according to the force balance relationship, the forces F on the central magnetic bridge, the two side magnetic bridges, and the middle magnetic bridge are... a F b and F c satisfy:

[0073]

[0074] Deformation ω of the central magnetic bridge, the two side magnetic bridges, and the middle magnetic bridge a ω b and ω c Satisfy geometric compatibility conditions

[0075]

[0076] From Hooke's Law and the theory of beam bending deformation, we can obtain:

[0077]

[0078] In the formula, A a and A c I represents the cross-sectional area of ​​the central magnetic isolation bridge and the intermediate magnetic isolation bridge, respectively. b and I c Let be the moments of inertia of the two magnetic isolation bridges and the middle magnetic isolation bridge, respectively, and β be the width direction angle of the middle magnetic isolation bridge, representing the angle between the width direction of the middle magnetic isolation bridge and the normal direction of the pole shoe surface. Solving equations (9) to (11) simultaneously, we can obtain the forces acting on each magnetic isolation bridge as follows:

[0079]

[0080] In the formula, k1 and k2 are respectively

[0081]

[0082] S1300: Based on the load type and stress of the magnetic isolation bridge, the design parameters of the middle magnetic isolation bridge and the stress relationships between the central magnetic isolation bridge, the middle magnetic isolation bridge, and the two side magnetic isolation bridges are obtained. Based on the stresses on the central magnetic isolation bridge, the middle magnetic isolation bridge, and the two side magnetic isolation bridges, the stress σ of the central magnetic isolation bridge, the two side magnetic isolation bridges, and the middle magnetic isolation bridge is obtained. a σ b and σ c They are respectively

[0083]

[0084] Where, σ a σ is the average stress of the central magnetic bridge under tensile load; b The maximum stress on both sides of the magnetic bridge under bending load (i.e., the stress at the point on the magnetic bridge furthest from the pole shoe region); the load on the middle magnetic bridge depends on its width direction angle β. When β = 0°, the middle magnetic bridge is only subjected to tensile load, σ c This represents the average stress. When β≠0°, the intermediate magnetic bridge simultaneously bears tensile and bending loads. σ c This indicates the maximum stress.

[0085] S200: Based on the stress analysis relationship, calculations and analyses are performed to obtain the design parameters of the middle magnetic bridge and the stress variation law of the central magnetic bridge, the middle magnetic bridge and the two side magnetic bridges;

[0086] At a rotor speed of 30000 r / min, with the rotor axial length set to La = 1 mm, the design parameters of the intermediate magnetic bridge and the maximum stress changes of the central magnetic bridge, intermediate magnetic bridge, and side magnetic bridges are calculated and analyzed. Figure 5 As shown. In the rotor structure strength design process, the most important factor is the maximum stress of the rotor structure. As long as the maximum stress meets the design requirements, the deformation and stress of each magnetic bridge will also meet the requirements. When the width direction angle of the middle magnetic bridge is 0° (i.e., the width direction of the middle magnetic bridge is perpendicular to the surface of the pole shoe at its location), the maximum stress of the central magnetic bridge reaches its minimum value, and its maximum stress first increases rapidly with the increase of the width direction angle of the middle magnetic bridge and then tends to a certain constant value. The main reason is that the bending deformation of the middle magnetic bridge is much larger than the tensile deformation under the same load. Therefore, when the width direction angle of the middle magnetic bridge is 0°, it only bears the tensile load, and the resulting tensile deformation is small. According to the geometric compatibility condition of deformation, the deformation of the central magnetic bridge and the two side magnetic bridges is small at this time, and the load is also small. Therefore, the maximum stress value of the magnetic bridge is also small. In other words, the presence of the middle magnetic bridge at this time can effectively share the centrifugal force acting on the central magnetic bridge and the two side magnetic bridges, thereby significantly improving the mechanical strength of the permanent magnet rotor structure.

[0087] Optionally, based on the above 14 formulas, after analysis and calculation, the variation law is obtained by taking the width direction angle β of the intermediate magnetic bridge as the independent variable and the stress, deformation, and bearing capacity of the three magnetic bridges as dependent variables, such as... Figure 5 , Figure 8 and Figure 9 As shown. In the calculation and analysis, the rotor axial length was set to 1 mm. The stress and deformation of the three magnetic bridges are independent of the rotor axial length, while the load-bearing capacity is directly proportional to the rotor axial length. Figure 8 and Figure 9 It can be seen that when the width direction angle of the middle magnetic bridge is zero, the maximum deformation and maximum load-bearing capacity of the three magnetic bridges reach the minimum value, indicating that the effect of the width direction angle of 0 on improving the strength of the rotor structure is optimal.

[0088] S300: Determine the optimal design parameters of the intermediate magnetic bridge based on the stress variation law. When the width direction angle of the intermediate magnetic bridge is 0°, the presence of the intermediate magnetic bridge can effectively distribute the centrifugal force acting on the central magnetic bridge and the two side magnetic bridges, thereby significantly improving the mechanical strength of the permanent magnet rotor structure. It can be seen that an important principle for selecting the parameters of the intermediate magnetic bridge is to ensure that its width direction is perpendicular to the rotor pole shoe surface at its location.

[0089] Example 2:

[0090] In one embodiment of the present invention, three different typical V-type permanent magnet rotors with three magnetic bridges, a V-type permanent magnet rotor with a middle magnetic bridge width direction angle β = 15°, and a V-type permanent magnet rotor with a middle magnetic bridge width direction angle β = 0° are given, and their maximum speeds are determined under the same structural parameters. Assuming the ultimate strength of the rotor core is 500 MPa, the stress changes of each magnetic bridge with rotational speed for the typical three-magnetic-bridge V-type permanent magnet rotor (Scheme a), the five-magnetic-bridge V-type permanent magnet rotor with β = 15° (Scheme b), and the V-type permanent magnet rotor designed according to the key parameter selection principle of the middle magnetic bridge (Scheme c) are respectively as follows: Figure 6 As shown in (a) of section 6, (b) of section 6, and (c) of section 6, it can be seen that, with all other structural parameters being the same and without considering the safety factor, the maximum permissible speed of scheme a is approximately 24,000 r / min; the maximum permissible speed of scheme a is approximately 26,000 r / min, which is 8.33% higher than that of scheme a; and the maximum permissible speed of scheme c is approximately 34,600 r / min, which is 44.2% and 33.1% higher than the maximum permissible speeds of the previous two schemes, respectively.

[0091] Example 3:

[0092] To verify the effectiveness of the above design method, finite element analysis software was used to calculate the stress distribution of three different typical V-type permanent magnet rotors with three magnetic bridges (Scheme a), a V-type permanent magnet rotor with a middle magnetic bridge width direction angle β = 15° (Scheme b), and a V-type permanent magnet rotor with a middle magnetic bridge width direction angle β = 0° (Scheme c) under the same conditions. Figure 7 (a) Figure 7 (b) and Figure 7 As shown in (c), it can be seen that the maximum stress at the magnetic isolation bridge in scheme c is smaller than the maximum stress at the corresponding magnetic isolation bridge in scheme b, and its stress is significantly smaller than the magnetic isolation bridge stress in scheme a. This demonstrates that the design method of the present invention is effective.

[0093] Example 4:

[0094] The implementation of the various embodiments of this invention is based on programmed processing by a device with a central processing unit. Therefore, in practical engineering, the technical solutions and functions of the various embodiments of this invention can be encapsulated into various modules. Based on this reality, and building upon the above embodiments, this invention provides a design system for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges, used to execute a design method for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges as described in the above method embodiments. It includes:

[0095] The stress acquisition module is used to obtain the stress of the central magnetic bridge, the middle magnetic bridge, and the two side magnetic bridges based on the structural characteristics of the magnetic bridge, the geometric characteristics of the pole shoe region, the force balance equation of the magnetic bridge, the geometric compatibility conditions, the material physics equations, and the load form.

[0096] The calculation and analysis module is used to perform calculations and analyses based on the stress to obtain the design parameters of the intermediate magnetic bridge and the stress variation law of the central magnetic bridge, the intermediate magnetic bridge and the two side magnetic bridges;

[0097] The optimal selection module is used to determine the optimal design parameters of the intermediate magnetic bridge based on the stress variation law.

[0098] It should be noted that the apparatus in the device embodiments provided by the present invention can be used not only to implement the methods in the above method embodiments, but also to implement the methods in other method embodiments provided by the present invention. The only difference is that corresponding functional modules are set. The principle is basically the same as that of the above device embodiments provided by the present invention. As long as those skilled in the art can improve the apparatus in the above device embodiments by referring to the specific technical solutions in other method embodiments and combining technical features to obtain corresponding technical means and technical solutions composed of these technical means, on the basis of the above device embodiments, under the premise of ensuring the practicality of the technical solutions, so as to obtain corresponding device-type embodiments for implementing the methods in other method-type embodiments.

[0099] The methods in the embodiments of the present invention are implemented using electronic devices; therefore, it is necessary to describe the relevant electronic devices. For this purpose, embodiments of the present invention provide an electronic device comprising: at least one central processor, a communications interface, at least one memory, and a communication bus, wherein the at least one central processor, the communications interface, and the at least one memory communicate with each other via the communication bus. The at least one central processor can invoke logical instructions stored in the at least one memory to execute all or part of the steps of the methods provided in the foregoing method embodiments.

[0100] Furthermore, when the logical instructions in at least one of the aforementioned memories can be implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various method embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0101] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0102] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0103] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. Based on this understanding, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, or sometimes in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0104] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0105] 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 V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges, characterized in that, Includes the following steps: S100: Based on the structural characteristics of the magnetic isolation bridge, the geometric characteristics of the pole shoe region, the force balance equation of the magnetic isolation bridge, the geometric compatibility conditions, the material physics equations and the load form, the stress analytical relationship of the central magnetic isolation bridge, the middle magnetic isolation bridge and the two side magnetic isolation bridges is obtained. S200: Based on the stress analysis relationship, calculations and analyses are performed to obtain the design parameters of the middle magnetic bridge and the stress variation law of the central magnetic bridge, the middle magnetic bridge and the two side magnetic bridges; S300: Determine the optimal design parameters of the intermediate magnetic bridge based on the stress variation law; the design parameters include: the width direction angle of the intermediate magnetic bridge; The optimal width direction angle of the intermediate magnetic bridge is 0°, so that the width direction of the intermediate magnetic bridge is perpendicular to the surface of the rotor pole shoe at its location.

2. The design method of a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to claim 1, characterized in that, S100 includes: S1100: Divide the pole shoe region and obtain the centrifugal force acting on the magnetic isolation bridge and permanent magnet.

3. The design method of a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to claim 2, characterized in that, The S100 further includes: S1200: Establish the force balance equation of the magnetic isolation bridge, determine the geometric compatibility conditions and material physics equations, and jointly solve the force on the magnetic isolation bridge.

4. The design method of a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to claim 3, characterized in that, The S100 further includes: S1300: Based on the load form and the force on the magnetic isolation bridge, the design parameters of the middle magnetic isolation bridge and the stress relationship between the central magnetic isolation bridge, the middle magnetic isolation bridge and the magnetic isolation bridges on both sides are obtained.

5. The design method of a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to claim 2, characterized in that, Specifically, S1100 includes: Based on the structural characteristics of the magnetic isolation bridge, the pole shoe region is divided into multiple regions that are symmetrical about the rotor circumference; Based on the geometric characteristics of the region, the equivalent centroid of the rotor structure is obtained; Based on the geometric characteristics of the region, the equivalent centroid of the permanent magnet is obtained; Based on the obtained equivalent centroid of the rotor structure and the equivalent centroid of the permanent magnet, the centrifugal force acting on the permanent magnet is determined.

6. The design method of a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to claim 3, characterized in that, Specifically, S1200 includes: Establish the force balance equation between the central magnetic isolation bridge, the middle magnetic isolation bridge, and the two side magnetic isolation bridges, that is, the sum of the forces on the central magnetic isolation bridge, the middle magnetic isolation bridge, and the two side magnetic isolation bridges is balanced with the centrifugal force acting on the permanent magnet. The deformations of the central magnetic bridge, the middle magnetic bridge, and the two magnetic bridges are obtained based on the forces on the central magnetic bridge, the middle magnetic bridge, and the two magnetic bridges, and the geometric coordination conditions among the central magnetic bridge, the middle magnetic bridge, and the two magnetic bridges are established. Based on the force balance equations and geometric compatibility conditions among the forces on the central magnetic bridge, the intermediate magnetic bridge, and the two side magnetic bridges, the analytical relationships between the forces on the central magnetic bridge, the intermediate magnetic bridge, and the two side magnetic bridges and the structural dimensional parameters are obtained.

7. The design method of a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges according to claim 4, characterized in that, Specifically, S1300 includes: obtaining the analytical relationship between the stress of the central magnetic bridge, the stress of the middle magnetic bridge, and the stress of the magnetic bridges on both sides and the structural dimension parameters, and the load form of the magnetic bridges, based on the analytical relationship between the stress of the central magnetic bridge, the stress of the middle magnetic bridge, and the stress of the magnetic bridges on both sides and the structural dimension parameters of each magnetic bridge.

8. A design system for a V-shaped built-in high-speed permanent magnet rotor with multiple magnetic bridges, characterized in that, include: The stress acquisition module is used to obtain the stress analytical relationship of the central magnetic bridge, the middle magnetic bridge and the two side magnetic bridges based on the structural characteristics of the magnetic bridge, the geometric characteristics of the pole shoe region, the force balance equation of the magnetic bridge, the geometric compatibility conditions, the material physics equations and the load form. The calculation and analysis module is used to perform calculations and analyses based on the stress analytical relationship to obtain the design parameters of the middle magnetic bridge and the stress variation law of the central magnetic bridge, the middle magnetic bridge and the two side magnetic bridges; The optimal selection module is used to determine the optimal design parameters of the intermediate magnetic bridge based on the stress variation law. The design parameters include the width direction angle of the intermediate magnetic bridge. The optimal width direction angle of the intermediate magnetic bridge is 0°, so that the width direction of the intermediate magnetic bridge is perpendicular to the surface of the rotor pole shoe at its location.

9. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions that cause the computer to perform the method as described in any one of claims 1-7.

10. An electronic terminal, characterized in that, include: At least one processor, at least one memory, a communication interface, and a bus; wherein, The processor, memory, and communication interface communicate with each other through the bus; The memory stores program instructions that can be executed by the processor, which invokes the program instructions to implement the method as described in any one of claims 1-7.

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