Multi-harmonic suppression segmented skewed pole rotor design method, rotor structure and system

Abstract

The invention discloses a multi-harmonic suppression segmented skewed pole rotor design method, a rotor structure and a system, and relates to the technical field of permanent magnet synchronous motors. The method comprises the steps of determining n harmonic waves, specifically v1, v2... vn, of the electromagnetic performance of the permanent magnet synchronous motor needing to be suppressed in a mechanical period, and calculating to obtain a linear segmentation skewed pole segment number 2n according to the n harmonic waves; zero points are constructed in a frequency domain according to a frequency domain expression of a traditional linear piecewise function two-segment skewed pole function Daxi, inverse Fourier transform is carried out on the frequency domain expression of the skewed pole function Daxi, and a skewed pole angle corresponding to each segment is obtained. According to the method, a plurality of zero points can be artificially constructed for the skewed pole distribution function in the frequency domain, so that a plurality of harmonic waves of any electromagnetic performance of the permanent magnet synchronous motor are suppressed, for example, fifth and seventh harmonic waves in counter electromotive force are eliminated at the same time, or certain harmonic waves in the counter electromotive force and certain harmonic waves in cogging torque are eliminated at the same time; or a certain harmonic wave of the torque pulsation and some harmonic waves in the electromagnetic force of the key order are eliminated at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and in particular to a multi-harmonic suppressed segmented skew-pole rotor design method, a rotor structure and a system. Background Art

[0002] Permanent magnet synchronous motors are core components in industrial applications such as high-precision machine tools, hydraulic injection molding machines, and electric vehicles. Their performance directly affects the competitiveness of the entire product. Due to the influence of the non-sinusoidal armature winding magnetomotive force of the stator, the non-sinusoidal permanent magnet magnetomotive force of the rotor, and the magnetic permeability of the stator slot, electromagnetic performance harmonic distortion such as back EMF, cogging torque, and radial / tangential electromagnetic force waves are often caused, resulting in large torque pulsation and vibration noise. In order to reduce the harmonics of electromagnetic performance such as back EMF, the industrial field often adopts the solution of segmented skewed pole rotors to suppress the harmonics in electromagnetic performance by segmented pole staggering, such as:

[0003] The existing patent (publication number: CN 11562726) proposes a permanent magnet motor rotor for automobiles with arbitrary segmented skewed poles. The angle between the segments 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 rotor segments. The angles between the segments are the same, thereby suppressing the motor cogging torque; the existing patent (publication number: CN20211059041.2) proposes a skewed pole rotor with non-uniform segmented rotor skewed poles, which divides the permanent magnet into multiple segments symmetrically along the axial direction, and the axial offset angles and stacking thicknesses of each segment are different, while the stator is a semi-closed slot and a closed slot mixed and stacked in proportion; the existing patent (publication number: CN117578766) proposes a rotor structure with uneven skewed pole angles, and the skewed pole angles between the rotor cores of each segment are determined according to the sine function distribution, which can further reduce the cogging torque; the existing patent (publication number: CN 115995896) proposed a segmented skew-pole rotor with unequal lengths and angles to eliminate specific harmonic torque pulsation orders or radial electromagnetic force orders.

[0004] However, the above-mentioned existing skewed pole methods are limited to eliminating electromagnetic performance harmonics of a specific order or multiple harmonics that are integer multiples, and cannot eliminate multiple harmonics of any harmonic order at the same time. For this reason, we propose a segmented skewed pole rotor design method, rotor structure and system for multi-harmonic suppression. Summary of the invention

[0005] The object of the present invention is to provide a design method, rotor structure and system of a segmented skewed-pole rotor with multi-harmonic suppression, so as to solve the problems raised in the above-mentioned background technology.

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

[0007] Determine the n harmonics of the permanent magnet synchronous motor electromagnetic performance that need to be suppressed within the mechanical period, specifically v1, v2…v n According to the n harmonics, the number of linear segmented oblique pole segments is 2. n ;

[0008] According to the traditional linear piecewise function two-segment oblique pole function D axial_s The frequency domain expression of constructs zero points in the frequency domain, and the slant pole function D axial_s The frequency domain expression of is inverse Fourier transformed to derive its corresponding expression in the physical space domain D axial_s (β);

[0009] According to the above analytical expression D axial_s (β), taking the circumferential centerline as the zero point, the offset angle of each segmented skew-pole rotor core is calculated by monotonically shifting along the same rotation direction of the circumference.

[0010] Furthermore, the slope function D axial_s The analytical expression in the frequency domain is:

[0011]

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

[0013] Furthermore, the expression D axial_s (β) are as follows:

[0014]

[0015] In the formula, v1, v2…v n is the harmonic order, β is the circular angle in radians.

[0016] Furthermore, the corresponding angles of the segmented skew-pole rotor cores are calculated as follows:

[0017]

[0018] Where β1, β2, …, β n is the circular angle corresponding to each segment oblique pole, in radians;

[0019] Among them, the angle unit is radian, and the conversion formula between radian and angle is:

[0020]

[0021] In the formula, is the circular angle corresponding to each segment oblique pole, in degrees.

[0022] According to a second aspect of the present invention, the present invention provides a multi-harmonic suppression segmented skewed pole rotor structure, which is designed using the multi-harmonic suppression segmented skewed pole rotor design method described above, and includes:

[0023] A driving shaft, wherein a plurality of rotor punchings are coaxially mounted on the outer surface of the driving shaft, and two adjacent rotor punchings are staggered with each other;

[0024] A plurality of mounting grooves are provided on the outer surface of the rotor punching sheet and are distributed at equal distances along the circumference of the rotor punching sheet. Permanent magnets are installed in the mounting grooves.

[0025] Furthermore, the drive shaft and the rotor punching sheet are interference fit, a groove is provided on the outer surface of the drive shaft, and a protrusion matched with the groove is fixedly connected to the inner wall of the rotor punching sheet.

[0026] Furthermore, a glue storage groove is provided inside the installation groove, and the permanent magnet is fixed in the installation groove by epoxy resin glue.

[0027] Furthermore, the two adjacent rotor punchings are fixed with epoxy resin glue.

[0028] According to a third aspect of the present invention, the present invention provides a multi-harmonic suppression segmented skewed pole rotor design system, which is used for the multi-harmonic suppression segmented skewed pole rotor design method, comprising:

[0029] The first calculation module is used to determine the n harmonics of the electromagnetic performance of the permanent magnet synchronous motor that need to be suppressed within the mechanical period, specifically v1, v2…v n According to the n harmonics, the number of linear segmented oblique pole segments is 2. n ;

[0030] The derivation module is used to derive the two-segment oblique pole function D according to the traditional linear piecewise function axial_s The frequency domain expression of constructs zero points in the frequency domain, and the slant pole function D axial_s The frequency domain expression of is inverse Fourier transformed to derive its corresponding expression in the physical space domain D axial_s (β);

[0031] The second calculation module is used to calculate the axial_s (β), taking the circumferential centerline as the zero point, the offset angle of each segmented skew-pole rotor core is calculated by monotonically shifting along the same rotation direction of the circumference.

[0032] According to a fourth aspect of the present invention, the present invention 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 when the processor loads and executes the computer program, the above-mentioned multi-harmonic suppression segmented skewed pole rotor design method is adopted.

[0033] The present invention has at least the following beneficial effects:

[0034] 1. The present invention can suppress multiple harmonics of any electromagnetic performance of the permanent magnet synchronous motor by artificially constructing multiple zero points for the skew-pole distribution function in the frequency domain, such as eliminating the 5th and 7th harmonics in the back electromotive force at the same time, or eliminating a certain harmonic in the back electromotive force and several harmonics in the cogging torque at the same time, or eliminating a certain harmonic of the torque pulsation and several harmonics in the key order electromagnetic force at the same time;

[0035] 2. The lengths of the segments of the skew-pole rotor of the present invention are all equal, and multiple sets of rotor core molds are not required, which is convenient for industrial application;

[0036] 3. The present invention ensures the accuracy of the angle of the inclined pole by means of the grooves on the outer surface of the drive shaft and the bosses on the inner surface of the rotor punching sheet, is easy to realize large-scale production, has a simple processing technology and low manufacturing cost;

[0037] 4. The present invention can ensure the oblique pole angle of the permanent magnet by the clearance fit between the mounting groove on the outer surface of the rotor punching and the permanent magnet.

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

[0039] Figure 1 This is a schematic diagram of the process of the method described in Example 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of the frequency domain zero point construction principle of the method described in Embodiment 1 of the present invention;

[0041] Figure 3 Taking the elimination of the 5th and 7th harmonics of the back electromotive force as an example, the present invention shows a schematic diagram of the rotor segmented skew angle corresponding to the first embodiment;

[0042] Figure 4 A comparison diagram of back-EMF harmonic spectra under the conventional oblique pole method and the oblique pole method proposed in Example 1;

[0043] Figure 5 It is a three-dimensional schematic diagram of the rotor structure in the second embodiment of the present invention.

[0044] Reference numerals:

[0045] 1. Rotor punching sheet; 2. Permanent magnet; 3. Driving shaft; 4. Bump; 5. Groove; 6. Mounting slot; 7. Glue storage slot. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions 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 ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0047] Embodiment 1:

[0048] See also Figure 1-Figure 4 The present invention provides a technical solution: a multi-harmonic suppression segmented skewed pole rotor design method, comprising the following steps:

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

[0050] S2. According to the frequency domain expression of the two oblique poles of the traditional linear piecewise function, a zero point is constructed in the frequency domain to achieve multi-harmonic suppression. 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 order, ω is the fundamental angular frequency;

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

[0054]

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

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

[0057]

[0058] Where β1, β2, …, β n is the circular angle corresponding to each segment oblique pole, in radians;

[0059] Among them, the angle unit is radian, and the conversion formula between radian and angle is:

[0060]

[0061] In the formula, is the circular angle corresponding to each segment oblique pole, in degrees.

[0062] Next, the technical solution of the present invention is further described in conjunction with specific embodiments:

[0063] Taking the elimination of the 5th and 7th harmonics of the back EMF of a 6-pole permanent magnet synchronous motor as an example, according to the above-mentioned calculation formula for the segmented skew angle, it can be obtained by 2 2 = 4-stage slanted poles simultaneously eliminate the 5th and 7th harmonics of the motor back EMF, and the specific implementation is as follows:

[0064] 1. The 5th and 7th harmonics of the back EMF are usually defined as the harmonic orders within the electrical cycle. For a 3-pole permanent magnet motor, the harmonic orders within the mechanical cycle should be 15th and 21st.

[0065] 2. According to the frequency domain expression of the traditional two-segment slant pole, if the traditional slant pole method determines the corresponding slant pole angle according to eliminating the 15th harmonic, then this method cannot suppress the 21st harmonic, and vice versa;

[0066] Therefore, in order to suppress the 15th and 21st harmonics at the same time, it is necessary to improve the traditional slant pole method, construct zero points at the 15th and 21st harmonics at the same time, and then obtain the slant pole angles corresponding to each segment through inverse Fourier transform;

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

[0068]

[0069]

[0070] It should be noted that the above description of the disclosed embodiments enables engineers and technicians in this field to implement and apply the present invention. Various modifications to these implementation cases can be extended to the simultaneous suppression of harmonics of different electromagnetic properties, such as simultaneous suppression of a certain harmonic of electromagnetic force and torque pulsation harmonics, or simultaneous suppression of torque pulsation harmonics of non-ideal times caused by tolerance, etc. The multi-harmonic suppression expression provided in the present invention can be implemented in other cases without departing from the spirit and scope of the present invention. For example, in order to eliminate the axial force generated by linear inclined poles, this design can be expanded to a 2n+1-segment V-type inclined pole method. Therefore, the above embodiments are only for illustrating the technical ideas of the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical scheme in accordance with the technical ideas proposed in the present invention shall fall within the protection scope of the present invention.

[0071] In summary, this embodiment can artificially construct multiple zero points for the skew-pole distribution function in the frequency domain, thereby suppressing multiple harmonics of any electromagnetic performance of the permanent magnet synchronous motor. For any n harmonics in back electromotive force, cogging torque, radial / tangential electromagnetic force, etc., theoretically, they can be suppressed by 2 n The linear segmented skewed pole rotor with equal length is completely eliminated. At the same time, in order to eliminate the axial force generated by the linear segmented skewed pole, the rotor can be expanded into two symmetrical ones along the axial center. n+1 Segmented V-shaped skewed pole rotor.

[0072] Embodiment 2:

[0073] like Figure 5 As shown, this embodiment provides a segmented skewed pole rotor structure for multi-harmonic suppression, which is designed using the segmented skewed pole rotor design method for multi-harmonic suppression described in the first embodiment, including:

[0074] A driving shaft, wherein a plurality of rotor punchings are coaxially mounted on the outer surface of the driving shaft, and two adjacent rotor punchings are staggered with each other;

[0075] A plurality of mounting grooves are provided on the outer surface of the rotor punching sheet and are distributed at equal distances along the circumference of the rotor punching sheet. Permanent magnets are installed in the mounting grooves.

[0076] According to the technical solution of this embodiment, the drive shaft and the rotor punching are interference fit, the interference amount is determined by the maximum torque and safety factor of the motor, and the rotor punching is pressed into the drive shaft by cold pressing;

[0077] The outer surface of the drive shaft is provided with grooves, and the inner wall of the rotor punching is fixedly connected with a protrusion adapted to the groove. The grooves are symmetrically arranged along the central axis and evenly distributed along the axial direction, and are used to locate the oblique pole angles of each segment of the rotor punching.

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

[0079] Specifically, this embodiment ensures the accuracy of the cant angle by matching the groove on the outer surface of the drive shaft with the boss on the inner surface of the rotor punching, which is easy to achieve large-scale production. In addition, the lengths of the segments of the cant rotor are equal, and there is no need for multiple sets of rotor core molds, which is convenient for industrial application. At the same time, the cant angle of the permanent magnet can be ensured by matching the clearance between the positioning groove on the outer surface of the rotor punching and the permanent magnet.

[0080] Embodiment three:

[0081] This embodiment provides a multi-harmonic suppression segmented skewed pole rotor design system, which is used to implement the multi-harmonic suppression segmented skewed pole rotor design method described in the first embodiment, including:

[0082] The first calculation module is used to determine the n harmonics of the electromagnetic performance of the permanent magnet synchronous motor that need to be suppressed within the mechanical period, specifically v1, v2…v n , according to the n harmonics, the number of linear segmented oblique pole segments is calculated to be 2n;

[0083] The derivation module is used to derive the two-segment oblique pole function D according to the traditional linear piecewise function axial_s The frequency domain expression of constructs zero points in the frequency domain, and the slant pole function D axial_s The frequency domain expression of is inverse Fourier transformed to derive its corresponding expression in the physical space domain D axial_s (β);

[0084] The second calculation module is used to calculate the axial_s (β), taking the circumferential centerline as the zero point, the offset angle of each segmented skew-pole rotor core is calculated by monotonically shifting along the same rotation direction of the circumference.

[0085] Specifically, the above-mentioned first calculation module, derivation module, and second calculation module can be embedded in a computer processing system. The computer calls the above-mentioned modules to complete the task of designing the segmented skewed pole rotor according to the above-mentioned segmented skewed pole rotor design method for multi-harmonic suppression; the above-mentioned first calculation module, derivation module, and second calculation module can perform operations according to the specific steps given in the segmented skewed pole rotor design method for multi-harmonic suppression.

[0086] It should be noted that it should be understood that the division of the various modules of the above system is only the division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated, and these modules can all be implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some modules can also be implemented in the form of software calling through processing elements, and some modules can be implemented in the form of hardware. For example, the first computing module can be a separately established processing element, or it can be integrated in a certain chip of the above-mentioned device. In addition, it can also be stored in the memory of the above-mentioned device in the form of program code, and called and executed by a certain processing element of the above-mentioned device. The implementation of other modules is similar. In addition, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each module above can be completed by the hardware integrated logic circuit in the processor element or the instruction in the form of software.

[0087] For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASIC), or one or more digital singnal processors (DSP), or one or more field programmable gate arrays (FPGA). For another example, when a module above is implemented in the form of a processing element scheduling program code, the processing element may 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 may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0088] Embodiment 4:

[0089] This embodiment provides a terminal device, including 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 when the processor loads and executes the computer program, the segmented skew-pole rotor design method for multi-harmonic suppression described in Embodiment 1 is adopted.

[0090] It should be noted that the terminal device can be a computer device such as a desktop computer, a laptop 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 input and output devices, network access devices and buses.

[0091] Furthermore, the processor may adopt a central processing unit (CPU). Of course, according to actual usage, other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. may also be adopted. The general-purpose processor may adopt a microprocessor or any conventional processor, etc., and the present application does not impose any restrictions on this.

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

[0093] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation 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 multi-harmonic suppression segmented skew-pole rotor design method, characterized in that: The following steps are involved: Determine the n harmonics of the permanent magnet synchronous motor electromagnetic performance that need to be suppressed within the mechanical period, specifically v1, v2…v n According to the n harmonics, the number of linear segmented oblique pole segments is 2. n ; According to the traditional linear piecewise function two-segment oblique pole function D axial_s The frequency domain expression of constructs zero points in the frequency domain, and the slant pole function D axial_s The frequency domain expression of is inverse Fourier transformed to derive its corresponding expression in the physical space domain D axial_s (β); According to the above analytical expression D axial_s (β), the circumferential centerline is the zero point, and the offset is monotonically shifted along the same rotation direction of the circumference, and the offset angle of each segmented skew-pole rotor core is calculated.

2. The multi-harmonic suppression segmented skewed-pole rotor design method according to claim 1 is characterized in that: The slope function D axial_s The analytical expression in the frequency domain is: In the formula, v1, v2…v n is the harmonic order, and ω is the fundamental angular frequency.

3. The multi-harmonic suppression segmented skewed-pole rotor design method according to claim 1, characterized in that: The expression D axial_s (β) are as follows: In the formula, v1, v2…v n is the harmonic order, β is the circular angle in radians.

4. The multi-harmonic suppression segmented skewed-pole rotor design method according to claim 1, characterized in that: The corresponding angles of each segmented skew-pole rotor core are calculated as follows: … Where β1, β2, …, β n is the circular angle corresponding to each segment oblique pole, in radians; Among them, the angle unit is radian, and the conversion formula between radian and angle is: … In the formula, is the circular angle corresponding to each segment oblique pole, in degrees.

5. A multi-harmonic suppression segmented skewed pole rotor structure, designed by using the multi-harmonic suppression segmented skewed pole rotor design method according to any one of claims 1 to 4, characterized in that: include: A driving shaft, wherein a plurality of rotor punchings are coaxially mounted on the outer surface of the driving shaft, and two adjacent rotor punchings are staggered with each other; A plurality of mounting grooves are provided on the outer surface of the rotor punching sheet and are distributed at equal distances along the circumference of the rotor punching sheet. Permanent magnets are installed in the mounting grooves.

6. The multi-harmonic suppression segmented skewed-pole rotor structure according to claim 5, characterized in that: The driving shaft and the rotor punching sheet are interference fit, a groove is provided on the outer surface of the driving shaft, and a convex block matched with the groove is fixedly connected to the inner wall of the rotor punching sheet.

7. The multi-harmonic suppression segmented skewed-pole rotor structure according to claim 5, characterized in that: A glue storage groove is provided inside the installation groove, and the permanent magnet is fixed in the installation groove by epoxy resin glue.

8. The multi-harmonic suppression segmented skewed-pole rotor structure according to claim 7, characterized in that: Two adjacent rotor punchings are fixed with epoxy resin glue.

9. A multi-harmonic suppression segmented skewed pole rotor design system, used to implement the multi-harmonic suppression segmented skewed pole rotor design method according to any one of claims 1 to 4, characterized in that: include: The first calculation module is used to determine the n harmonics of the electromagnetic performance of the permanent magnet synchronous motor that need to be suppressed within the mechanical period, specifically v1, v2…v n According to the n harmonics, the number of linear segmented oblique pole segments is 2. n ; The derivation module is used to derive the two-segment oblique pole function D according to the traditional linear piecewise function axial_s The frequency domain expression of constructs zero points in the frequency domain, and the slant pole function D axial_s The frequency domain expression of is inverse Fourier transformed to derive its corresponding expression in the physical space domain D axial_s (β); The second calculation module is used to calculate the axial_s (β), taking the circumferential centerline as the zero point, the offset angle of each segmented skew-pole rotor core is calculated by monotonically shifting along the same rotation direction of the circumference.

10. 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 that can be run on the processor. When the processor loads and executes the computer program, the segmented skew-pole rotor design method for multi-harmonic suppression according to any one of claims 1 to 4 is adopted.

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