Harmonic-suppressed segmented skew rotor design method, rotor structure and system

Abstract

This invention discloses a segmented skewed-pole rotor design method, rotor structure, and system for multi-harmonic suppression, relating to the field of permanent magnet synchronous motor technology. The invention includes: determining, within a mechanical cycle, n harmonics of the electromagnetic performance of the permanent magnet synchronous motor that need to be suppressed, specifically v1, v2…v… n Based on the n harmonics, the number of linear segmented skew segments is calculated to be 2. n According to the traditional linear piecewise function with two slant polar functions D axial_s The frequency domain expression constructs zeros in the frequency domain and applies the slant pole function D. axial_s The frequency domain expression is subjected to an inverse Fourier transform to obtain the slant angle for each segment. This invention can suppress multiple harmonics of arbitrary electromagnetic performance of permanent magnet synchronous motors by artificially constructing multiple zeros on the slant distribution function in the frequency domain. For example, it can simultaneously eliminate the 5th and 7th harmonics in the back EMF, or simultaneously eliminate a certain harmonic in the back EMF and several harmonics in the cogging torque, or simultaneously eliminate a certain harmonic in the torque pulsation and several harmonics in the key order electromagnetic force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of permanent magnet synchronous motor, in particular to a segmented skew rotor design method for multi-harmonic suppression, a rotor structure and a system. BACKGROUND

[0002] Permanent magnet synchronous motor is a core component for high-precision machine tools, hydraulic injection molding machines and electric vehicles, and its performance directly affects the competitiveness of the whole machine product. Due to the influence of non-sinusoidal armature winding magnetic motive force of the stator, non-sinusoidal permanent magnet magnetic motive force of the rotor and stator slot opening permeance, it often causes harmonic distortion of electromagnetic performance such as back electromotive force, cogging torque, radial / tangential electromagnetic force wave, and further generates large torque ripple and vibration noise. In order to reduce the harmonics of back electromotive force and other electromagnetic performance, the industrial field often adopts the scheme of segmented skew rotor, which suppresses the harmonics in electromagnetic performance by skewing the magnetic poles, such as:

[0003] The existing patent (publication number: CN11562726) proposes a segmented skew rotor for vehicle permanent magnet motor, the included angle between each segment of the rotor is calculated by the least common multiple of the number of stator slots and the number of rotor poles and the number of segmented rotor, and the included angle between each segment is the same, thereby suppressing the cogging torque of the motor; the existing patent (publication number: CN20211059041.2) proposes a skew rotor with non-uniform segmented skew, which divides the permanent magnets into multiple segments in an axial symmetry, and the axial segment offset angle and the stacking thickness are not the same, while the stator is a mixed and stacked half-closed slot and closed slot in proportion; the existing patent (publication number: CN117578766) proposes a rotor structure with non-uniform skew angle, the skew angle between each segment of the rotor core is determined according to a sinusoidal function, which can further reduce the cogging torque; the existing patent (publication number: CN115995896) proposes a segmented skew rotor with unequal length and unequal angle, which is used to eliminate specific harmonic torque ripple order or radial electromagnetic force order.

[0004] However, the above-mentioned skew methods are only limited to eliminating specific order electromagnetic performance harmonics or multiple harmonics that are integer multiples, and cannot eliminate multiple harmonics of any harmonic order at the same time. Therefore, we propose a segmented skew rotor design method for multi-harmonic suppression, a rotor structure and a system. SUMMARY

[0005] The purpose of the present application is to provide a segmented skew rotor design method for multi-harmonic suppression, a rotor structure and a system to solve the problems raised in the background art.

[0006] According to the first aspect of the present application, in order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a segmented skew rotor design method for multi-harmonic suppression, comprising the following steps:

[0007] The n harmonics of the electromagnetic performance of the permanent magnet synchronous motor to be inhibited in a mechanical cycle are determined, specifically v1, v2…v n The number of linearly segmented inclined pole segments is calculated to be 2 n according to the n harmonics;

[0008] According to the frequency domain expression of the two-segment inclined pole function D axial_s of the traditional linearly segmented function, zero points are constructed in the frequency domain, and the inverse Fourier transform of the frequency domain expression of the inclined pole function D axial_s is performed to derive the corresponding expression D axial_s (β) in the physical space domain;

[0009] According to the above analytical expression D axial_s (β), the circumferential center line is taken as the zero point, and the offset angle of each segmented inclined pole rotor core is calculated by monotonically offsetting in the same rotational direction along the circumference.

[0010] Further, the analytical expression of the inclined pole function D axial_s in the frequency domain is:

[0011]

[0012] In the formula, v1, v2…v n are harmonic numbers, and ω is the fundamental angular frequency.

[0013] Further, the expression D axial_s (β) is specifically as follows:

[0014]

[0015] In the formula, v1, v2…v n are harmonic numbers, and β is the circumferential angle in radians.

[0016] Further, the corresponding angle of each segmented inclined pole rotor core is calculated, specifically as follows:

[0017]

[0018] In the formula, β1, β2, …, β n are the corresponding circumferential angles of each segmented inclined pole in radians;

[0019] where the angle unit is radian, and the conversion formula between radian and degree is:

[0020]

[0021] In the formula, is the corresponding circumferential angle of each segmented inclined pole in degrees.

[0022] According to a second aspect of the present application, the present application provides a multi-harmonic suppressed segmented skew rotor structure, which is designed by using the above multi-harmonic suppressed segmented skew rotor design method, comprising:

[0023] a driving shaft, an outer surface of the driving shaft is coaxially provided with a plurality of rotor sheets, and two adjacent rotor sheets are staggered with each other;

[0024] a plurality of mounting grooves, the mounting grooves are provided on the outer surface of the rotor sheet, and the plurality of mounting grooves are equidistantly distributed along the circumferential direction of the rotor sheet, and a permanent magnet is mounted in the mounting groove.

[0025] Further, the driving shaft and the rotor sheet are in interference fit, the outer surface of the driving shaft is provided with a groove, and the inner wall of the rotor sheet is fixedly connected with a protrusion matched with the groove.

[0026] Further, the inside of the mounting groove is provided with a glue storage groove, and the permanent magnet is fixed in the mounting groove by epoxy resin glue.

[0027] Further, the two adjacent rotor sheets are fixed by using epoxy resin glue.

[0028] According to a third aspect of the present application, the present application provides a multi-harmonic suppressed segmented skew rotor design system, which is used for the above multi-harmonic suppressed segmented skew rotor design method, comprising:

[0029] a first calculation module, used for determining n harmonics of the electromagnetic performance of a permanent magnet synchronous motor in a mechanical cycle, which needs to be suppressed, and the n harmonics are v1, v2…v n , and the number of linear segmented skew segments is calculated to be 2 n according to the n harmonics;

[0030] a derivation module, used for constructing zero points in a frequency domain according to a frequency domain expression of a two-segment skew function D axial_s of a traditional linear segmented function, performing inverse Fourier transform on the frequency domain expression of the skew function D axial_s , and deriving a corresponding expression D axial_s (β) in a physical space domain;

[0031] a second calculation module, used for calculating the offset angle of each segmented skew rotor core according to the above analytical expression D axial_s (β), taking the circumferential center line as a zero point, and offsetting along the same rotation direction.

[0032] According to a fourth aspect of the present application, the present application provides a terminal device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the memory stores a computer program capable of running on the processor, and the processor loads and executes the computer program to adopt the above-mentioned multi-harmonic suppression segmented skew rotor design method.

[0033] The present application has at least the following advantages:

[0034] 1. The present application can artificially construct multiple zero points in the frequency domain for the skew pole distribution function, thereby suppressing multiple harmonics of any electromagnetic performance of the permanent magnet synchronous motor, such as simultaneously eliminating the 5th and 7th harmonics in the back electromotive force, or simultaneously eliminating a certain harmonic in the back electromotive force and several harmonics in the cogging torque, or simultaneously eliminating a certain harmonic of the torque ripple and several harmonics in the key order electromagnetic force, etc.

[0035] 2. The lengths of each segment of the skew rotor of the present application are equal, and multiple rotor core molds are not required, facilitating industrial application.

[0036] 3. The present application ensures the accuracy of the skew angle through the groove on the outer surface of the drive shaft and the boss on the inner surface of the rotor lamination, is easy to implement large-scale production, has a simple processing technology and low manufacturing cost.

[0037] 4. The present application can ensure the skew angle of the permanent magnet through the gap between the mounting groove on the outer surface of the rotor lamination and the permanent magnet.

[0038] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Flowchart of the method according to the first embodiment of the present application;

[0040] Figure 2 Principle diagram of frequency domain zero point construction for the method according to the first embodiment of the present application;

[0041] Figure 3 Rotor segmented skew angle diagram corresponding to the first embodiment for eliminating the 5th and 7th harmonics of the back electromotive force as an example of the present application;

[0042] Figure 4 Comparison diagram of back electromotive force harmonic spectrum under the traditional skew method and the skew method according to the first embodiment;

[0043] Figure 5 Schematic diagram of the rotor structure in the second embodiment of the present application.

[0044] REFERENCE NUMERALS:

[0045] 1, rotor lamination; 2, permanent magnet; 3, drive shaft; 4, protrusion; 5, recess; 6, mounting groove; 7, glue storage groove. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0047] Embodiment one:

[0048] Please refer to Figures 1-4 The present disclosure provides a technical solution: a segmented skewed pole rotor design method for multi-harmonic suppression, including the following steps:

[0049] S1. Determine the n harmonics of the electromagnetic performance of the permanent magnet synchronous motor that need to be suppressed in the mechanical period, specifically v1, v2…v n According to the n harmonics, the number of linear segmented skewed poles is calculated to be 2 n ;

[0050] S2. According to the frequency domain expression of the two segmented skewed poles of the traditional linear segmented function, construct a zero point in the frequency domain, so as to realize the suppression of multi-harmonics, therefore, D axial_s The analytical expression in the frequency domain can be expressed as:

[0051]

[0052] In the formula, v1, v2…v n is the harmonic number, and ω is the fundamental angular frequency;

[0053] S3. Using inverse Fourier transform, according to the frequency domain expression of the skewed pole function D axial_s , the corresponding expression in the physical space domain is derived, that is:

[0054]

[0055] In the formula, v1, v2…v n is the harmonic number, and β is the circular angle in radians;

[0056] S4. According to the above analytical expression D axial_s (β), taking the circumferential center line as the zero point, monotonically offset along the same rotation direction of the circumference, the offset angle of each segmented skewed pole rotor core is calculated, specifically as follows:

[0057]

[0058] In the formula, β1, β2, …, β n is the corresponding circumferential angle of each segment skew pole, unit is radian;

[0059] Wherein, the angle unit is radian, and the conversion formula of radian and angle is:

[0060]

[0061] In the formula, is the corresponding circumferential angle of each segment skew pole, unit is radian.

[0062] Next, the technical solutions of the application are further described in combination with specific embodiments:

[0063] Taking elimination of 5th and 7th harmonic of back EMF of a 6-pole permanent magnet synchronous motor as an example, according to the segment skew pole angle calculation formula in the above, 2 2 = 4 segment skew pole can eliminate 5th and 7th harmonic of back EMF of the motor, and the specific implementation is as follows:

[0064] 1. The 5th and 7th harmonic of back EMF is usually defined as the harmonic order in an electrical period, and for a 3-pole permanent magnet motor, the harmonic order in a mechanical period should be 15th and 21st;

[0065] 2. According to the frequency domain expression of the traditional two-segment skew pole, if the corresponding skew pole angle is determined according to the elimination of 15th harmonic in the traditional skew pole mode, the mode cannot suppress 21st harmonic, and vice versa;

[0066] Therefore, in order to suppress 15th and 21st harmonic at the same time, the traditional skew pole mode needs to be improved, and zero points are constructed at 15th and 21st harmonic, and then the corresponding skew pole angle of each segment is obtained through inverse Fourier transform;

[0067] 3. According to the angle expression provided above, the corresponding skew pole angle of each segment is calculated, and the corresponding angle is compared with the traditional skew pole mode as follows:

[0068]

[0069]

[0070] It should be noted that the above description of the disclosed embodiments enables an engineer skilled in the art to implement and apply the present application. Various modifications of these embodiments can be made to simultaneously suppress different electromagnetic performance harmonics, such as simultaneously suppressing certain harmonics of electromagnetic force and torque ripple harmonics, or simultaneously suppressing torque ripple harmonics of non-ideal order of torque ripple caused by tolerances, etc. The multi-harmonic suppression expression provided in the present application can be implemented in other cases without departing from the spirit and scope of the present application. For example, to eliminate the axial force generated by the linear skew field, the present design can be extended to a 2n+1 segment V-shaped skew field.

[0071] In summary, the present embodiment can suppress multiple harmonics of any electromagnetic performance of the permanent magnet synchronous motor by artificially constructing multiple zero points in the frequency domain of the skew field distribution function. For any n harmonics in back EMF, cogging torque, and radial / tangential electromagnetic force, a 2n+1 segment linear segmented skew field rotor can completely eliminate them theoretically. In order to eliminate the axial force generated by the linear segmented skew field, the rotor can be extended to a 2n+1 segment V-shaped segmented skew field rotor. n In summary, the present embodiment can suppress multiple harmonics of any electromagnetic performance of the permanent magnet synchronous motor by artificially constructing multiple zero points in the frequency domain of the skew field distribution function. For any n harmonics in back EMF, cogging torque, and radial / tangential electromagnetic force, a 2n+1 segment linear segmented skew field rotor can completely eliminate them theoretically. In order to eliminate the axial force generated by the linear segmented skew field, the rotor can be extended to a 2n+1 segment V-shaped segmented skew field rotor. n+1 In summary, the present embodiment can suppress multiple harmonics of any electromagnetic performance of the permanent magnet synchronous motor by artificially constructing multiple zero points in the frequency domain of the skew field distribution function. For any n harmonics in back EMF, cogging torque, and radial / tangential electromagnetic force, a 2n+1 segment linear segmented skew field rotor can completely eliminate them theoretically. In order to eliminate the axial force generated by the linear segmented skew field, the rotor can be extended to a 2n+1 segment V-shaped segmented skew field rotor.

[0072] Embodiment Two:

[0073] As shown in Figure 5 , the present embodiment provides a segmented skew field rotor structure for suppressing multiple harmonics, which is designed using the design method for suppressing multiple harmonics of the segmented skew field rotor described in Embodiment One, comprising:

[0074] a drive shaft, an outer surface of the drive shaft coaxially mounting a plurality of rotor laminations, and adjacent two rotor laminations being staggered with each other;

[0075] a plurality of mounting grooves, the mounting grooves being provided on the outer surface of the rotor lamination and being equidistantly distributed along the circumference of the rotor lamination, and a permanent magnet being mounted in the mounting grooves.

[0076] For the technical solution of the present embodiment, the drive shaft and the rotor lamination are in interference fit, the interference amount is determined by the maximum torque of the motor and the safety factor, and the rotor lamination is pressed into the drive shaft by cold pressing;

[0077] the outer surface of the drive shaft is provided with a groove, and the inner wall of the rotor lamination is fixedly connected with a protrusion matched with the groove, the groove is symmetrically arranged along the central axis and uniformly distributed along the axial direction, and is used for positioning the skew field angles of the segments of the rotor lamination.

[0078] Further, the inside of the installation groove is provided with a glue storage groove, and the permanent magnet is fixed in the installation groove by epoxy resin glue, and the two adjacent rotor punching sheets are also fixed by epoxy resin glue.

[0079] Specifically, the groove on the outer surface of the driving shaft and the boss on the inner surface of the rotor punching sheet are matched to ensure the accuracy of the skew angle, facilitate large-scale production, and the lengths of the segments of the skew rotor are equal, without the need for multiple rotor core molds, facilitating industrial application. Meanwhile, the gap between the positioning groove on the outer surface of the rotor punching sheet and the permanent magnet can also ensure the skew angle of the permanent magnet.

[0080] Embodiment Three

[0081] The embodiment provides a segmented skew rotor design system for multi-harmonic suppression, which is used for realizing the segmented skew rotor design method for multi-harmonic suppression described in Embodiment One, and comprises the following modules.

[0082] A first calculation module is configured to determine n harmonics of the electromagnetic performance of the permanent magnet synchronous motor that needs to be suppressed in a mechanical period, and the n harmonics are v1, v2…v n n harmonics to obtain a linear segmented skew segment number 2n.

[0083] A derivation module is configured to construct a zero point in a frequency domain according to a frequency domain expression of a two-segment skew function D axial_s of a traditional linear segmented function, perform inverse Fourier transform on the frequency domain expression of the skew function D axial_s , and derive a corresponding expression D axial_s (β) in a physical space domain.

[0084] A second calculation module is configured to calculate the offset angle of each segmented skew rotor core according to the above analytical expression D axial_s (β), taking the circumferential center line as a zero point and offseting in the same rotation direction.

[0085] Specifically, the first calculation module, the derivation module and the second calculation module can be embedded into a computer processing system, and the computer can complete the task of designing the segmented skew rotor according to the above provided multi-harmonic suppression segmented skew rotor design method by calling the above modules; the first calculation module, the derivation module and the second calculation module can perform operations according to the specific steps given by the multi-harmonic suppression segmented skew rotor design method.

[0086] It should be understood that the division of the above system modules is only logical function division, and actual implementation can be integrated into one physical entity in whole or in part, or physically separated, and these modules can be implemented in the form of software called by a processing element, or in the form of hardware, or in the form of software called by a processing element for part of the modules and in the form of hardware for part of the modules. For example, the first calculation module can be a separately arranged processing element, or can be integrated in a certain chip of the above device, in addition, it can also be in the form of program code stored in the memory of the above device, and the function of the above signal processing module is called and executed by a certain processing element of the above device, and the implementation of other modules is similar. In addition, all or part of these modules can be integrated together or independently implemented, and the processing element described herein can be an integrated circuit with signal processing capability, and in the implementation process, each step of the above method or each module can be completed by integrated logic circuit of hardware in the processing element or instruction in the form of software.

[0087] For example, the above modules can be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), etc. For another example, when a certain module above is implemented in the form of program code called by a processing element, the processing element can be a general purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules can be integrated together to implement in the form of system on a chip (SOC).

[0088] Embodiment Four

[0089] The embodiment provides a terminal device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor. The memory stores a computer program capable of running on the processor. When the processor loads and executes the computer program, the multi-harmonic suppression segmented skewed rotor design method described in embodiment one is adopted.

[0090] It should be noted that the terminal device can adopt a computer device such as a desktop computer, a notebook computer or a cloud server, and the terminal device includes but is not limited to a processor and a memory, for example, the terminal device can also include an input / output device, a network access device and a bus, etc.

[0091] Further, the processor can adopt a central processing unit (CPU), of course, according to the actual use case, other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), ready programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. can also be adopted, the general-purpose processor can adopt a microprocessor or any conventional processor, etc. The present application does not make any limitation in this regard.

[0092] It should be noted that in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0093] For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances. When an element is referred to as "assembled", "mounted", "fixed" or "disposed" on another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not the only implementation.

[0094] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0095] In the description of the disclosure, the description of the terms "one embodiment", "an example", "a specific example", and the like, means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the disclosure. In the description of the disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A method of designing a segmented skew pole rotor for multi-harmonic suppression, characterized by, The method comprises the following steps: Determine the n harmonics of the electromagnetic performance of the permanent magnet synchronous motor in the mechanical cycle that need to be inhibited, specifically v 1, v 2… v n According to the n harmonics, the number of linear segmented inclined pole segments calculated is 2 n ; According to the traditional linear piecewise function two-section slope function D axial_s The frequency domain expression constructs zero point in the frequency domain, and the inverse Fourier transform of the frequency domain expression of the slope function D axial_s The corresponding expression of the slope function in the physical space domain is derived D axial_s β );​ According to the expression D axial_s β , the circumferential center line is zero point, and is monotonously offset along the same rotation direction of the circumference, and the offset angle of each segmented skew pole rotor core is calculated.​ The skewing function D axial_s The analytical expression in the frequency domain is wherein v 1, v 2… v n is the harmonic number, ω is the fundamental angular frequency; The expression In detail as follows: In the formula, v 1, v 2… v n is the harmonic number, β is the circular angle, in radians.

2. The method of segmented skewed-pole rotor design with multiple harmonic suppression of claim 1, wherein: The corresponding angle of each segmented skew rotor core is calculated, and the calculation is as follows: In the formula, β 1, β 2, …, β n is the corresponding circumferential angle of each segment skew pole, in radians. The conversion formula between radian and angle is as follows: In the formula, , ,… is the corresponding circumferential angle of each segment skew pole, in degrees.

3. A segmented skewed pole rotor structure with multi-harmonic suppression designed using the method of designing a segmented skewed pole rotor structure with multi-harmonic suppression according to any one of claims 1 to 2, characterized in that, The method comprises the following steps: A driving shaft, an outer surface of the driving shaft is coaxially provided with a plurality of rotor laminations, and adjacent two rotor laminations are staggered with each other; A plurality of mounting grooves are provided on the outer surface of the rotor lamination, and the plurality of mounting grooves are equidistantly distributed in the circumferential direction of the rotor lamination, and a permanent magnet is mounted in the mounting groove.

4. A segmented ramped pole rotor structure for multi-harmonic suppression as claimed in claim 3, wherein: The driving shaft and the rotor lamination are in interference fit, the outer surface of the driving shaft is provided with a groove, and the inner wall of the rotor lamination is fixedly connected with a protrusion matched with the groove.

5. A segmented ramped pole rotor structure for multi-harmonic suppression as claimed in claim 4, wherein: The inside of the mounting groove is provided with a glue storage groove, and the permanent magnet is fixed in the mounting groove by epoxy resin glue.

6. A segmented ramped pole rotor structure for multi-harmonic suppression as claimed in claim 5, characterized in that: Adjacent two rotor laminations are fixed by epoxy resin glue.

7. A segmented skewed pole rotor design system for implementing the multi-harmonic suppressed segmented skewed pole rotor design method of any one of claims 1 to 2, characterized by, The method comprises the following steps: The first calculation module is used for determining n harmonics of electromagnetic performance of the permanent magnet synchronous motor which needs to be suppressed in a mechanical period, and specifically v 1, v 2… v n According to the n harmonics, the number of linear segmented inclined pole segments is calculated to be 2 n ; derivation module, configured to derive a two-segment linear function according to a traditional linear function D axial_s construct a zero point in a frequency domain according to a frequency domain expression of the two-segment linear function D axial_s perform inverse Fourier transform on the frequency domain expression of the two-segment linear function to derive a corresponding expression of the two-segment linear function in a physical space domain ; A second calculation module is configured to calculate the offset angle of each subsection skew-pole rotor core according to the expression With the circumferential center line as zero point and along the same rotation direction of the circumference, the offset angle of each subsection skew-pole rotor core is calculated.

8. A terminal device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that, The memory stores a computer program capable of running on the processor, and when the processor loads and executes the computer program, the multi-harmonic suppression segmented skew rotor design method in any one of claims 1 to 2 is adopted.

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