Improved method and device for a variable reluctance resolver based on a reluctance sinusoidal rotor

Abstract

The application provides an improved method and device for a variable reluctance resolver based on a reluctance sinusoidal rotor, and belongs to the technical field of variable reluctance resolvers. The method comprises the following steps: obtaining an air gap permeance waveform of the reluctance sinusoidal rotor; determining an output cosine envelope waveform of the reluctance sinusoidal rotor according to the air gap permeance waveform and a unit cosine envelope waveform; determining a target harmonic component with the largest total harmonic distortion contribution to the output cosine envelope waveform according to the output cosine envelope waveform; and determining a target stator tooth width of the variable reluctance resolver by using a finite element simulation method, with the amplitude of the target harmonic component being the smallest as the target. The improved method and device for the variable reluctance resolver based on the reluctance sinusoidal rotor can determine the rotor configuration of the reluctance sinusoidal rotor and the stator tooth width of the variable reluctance resolver, so as to improve the variable reluctance resolver based on the reluctance sinusoidal rotor and obtain a smaller THD.

Description

Technical Field

[0001] This invention relates to the field of variable reluctance rotary transformer technology, and in particular to an improved method and apparatus for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor. Background Technology

[0002] The variable reluctance rotary transformer (VR rotary transformer) has a simple structure and stable performance, making it a promising absolute position sensor.

[0003] In VR rotary transformers, the envelope of the output signal is generated by the change in air gap permeability length at different rotor positions. To ensure a sinusoidal output envelope, VR rotary transformers commonly use a sinusoidal permeability rotor.

[0004] Compared to traditional magnetic permeability sinusoidal rotors, there is less research on VR rotary transformers based on magnetic reluctance sinusoidal rotors, making it difficult to design a high-performance VR rotary transformer based on magnetic reluctance sinusoidal rotors. Summary of the Invention

[0005] This invention provides an improved method and apparatus for a variable reluctance rotary transformer based on a reluctance sinusoidal rotor, which solves the problem that it is difficult to design a high-performance VR rotary transformer based on a reluctance sinusoidal rotor in the prior art, so as to reduce the total harmonic distortion (THD) of the output cosine envelope.

[0006] In a first aspect, the present invention provides an improved method for a variable reluctance rotary transformer based on a reluctance sinusoidal rotor, comprising: acquiring the air gap permeability waveform of the reluctance sinusoidal rotor; determining the output cosine envelope waveform of the reluctance sinusoidal rotor based on the air gap permeability waveform and the unit cosine envelope waveform; determining the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform based on the output cosine envelope waveform; and determining the target stator tooth width of the variable reluctance rotary transformer using a finite element simulation method with the minimum amplitude of the target harmonic component as the objective.

[0007] This invention provides an improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, which obtains the air gap permeability waveform of the sinusoidal reluctance rotor. The specific formula is as follows:

[0008]

[0009] Where P(θ,t) represents the air gap permeability waveform of the reluctance sinusoidal rotor, P0 represents the bias value of the air gap permeability, and P amp ω represents the amplitude of the change in air gap permeability. m t represents the mechanical rotation speed, t represents time, and p represents the number of pole pairs.

[0010] This invention provides an improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, wherein the analytical formula for the unit cosine envelope waveform is:

[0011]

[0012] Among them, V x ′ Represents the unit cosine envelope waveform, k unit θ represents the per-unit coefficient, θ0 represents half a rotor pole arc angle, and i is a positive integer.

[0013] This invention provides an improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor. After obtaining the air gap permeability waveform of the sinusoidal reluctance rotor, the method further includes:

[0014] Determine the air gap length of the reluctance sinusoidal rotor;

[0015] The rotor configuration of the reluctance sinusoidal rotor is determined based on the air gap length.

[0016] This invention provides an improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, wherein the expression for the air gap length is:

[0017] δ(θ,t)=δ min +k amp (1-cos(p(θ+ω m t)));

[0018] Where, k amp δ represents the amplitude of the air gap length variation. min This represents the minimum air gap length.

[0019] This invention provides an improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, wherein the target harmonic component is the third harmonic.

[0020] This invention provides an improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor. The method utilizes finite element simulation to determine the target stator tooth width of the variable reluctance rotary transformer with the goal of minimizing the amplitude of the target harmonic components. This includes: constructing a simulation model of a 4-pole, 16-tooth reluctance rotary transformer based on a sinusoidal reluctance rotor; and continuously adjusting the stator tooth width of the simulation model within a preset range to obtain the target stator tooth width.

[0021] Secondly, the present invention also provides an improved device for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, comprising:

[0022] The first module is used to obtain the air gap magnetic permeability waveform of the reluctance sinusoidal rotor;

[0023] The second module is used to determine the output cosine envelope waveform of the reluctance sinusoidal rotor based on the air gap magnetic permeability waveform and the unit cosine envelope waveform.

[0024] The third module is used to determine the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform, based on the output cosine envelope waveform.

[0025] The fourth module uses the finite element simulation method to determine the target stator tooth width of the variable reluctance rotary transformer, with the goal of minimizing the amplitude of the target harmonic components.

[0026] Thirdly, the present invention also provides a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, wherein the variable reluctance rotary transformer is improved by applying the improved method of the variable reluctance rotary transformer based on a sinusoidal reluctance rotor described in any of the above claims.

[0027] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the improved method for a variable reluctance rotary transformer based on a reluctance sinusoidal rotor as described above.

[0028] The present invention provides an improved method and apparatus for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, which can determine the rotor configuration of the sinusoidal reluctance rotor and the stator tooth width of the reluctance rotary transformer, so as to improve the variable reluctance rotary transformer based on the sinusoidal reluctance rotor and obtain a smaller THD. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a flowchart illustrating the improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor provided by the present invention.

[0031] Figure 2 This is a schematic diagram comparing the shape of the sinusoidal magnetic permeability and sinusoidal magnetic reluctance rotors with the air gap magnetic permeability waveform provided by the present invention;

[0032] Figure 3 This is a schematic diagram comparing the output cosine envelope of the magnetic permeability sinusoidal rotor and the magnetic reluctance sinusoidal rotor with fast Fourier analysis provided by the invention.

[0033] Figure 4This is a schematic diagram of the topology of the reluctance sinusoidal rotor rotary transformer and the permeability sinusoidal rotor rotary transformer provided by the present invention;

[0034] Figure 5 This is a schematic diagram showing the relationship between the third harmonic amplitude, phase angle, and THD magnitude of the envelope of the reluctance sinusoidal rotary transformer and the stator tooth width provided by the present invention.

[0035] Figure 6 This is a schematic diagram of the angle error of the reluctance sinusoidal rotary transformer and the permeability sinusoidal rotary transformer provided by the present invention;

[0036] Figure 7 This is a schematic diagram of the winding arrangement and number of turns on each stator tooth of the variable reluctance rotary transformer provided by the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] It should be noted that, in the description of the embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover 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 limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more.

[0040] The following is combined Figures 1-7 This invention describes an improved method and apparatus for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, as provided in embodiments of the present invention.

[0041] Figure 1This is a flowchart illustrating the improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor provided by the present invention. Figure 1 As shown, including but not limited to the following steps:

[0042] Step 101: Obtain the air gap magnetic permeability waveform of the reluctance sinusoidal rotor.

[0043] Step 102: Determine the output cosine envelope waveform of the reluctance sinusoidal rotor based on the air gap magnetic permeability waveform and the unit cosine envelope waveform;

[0044] Step 103: Based on the output cosine envelope waveform, determine the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform;

[0045] Step 104: Using the finite element simulation method, with the goal of minimizing the amplitude of the target harmonic component, determine the target stator tooth width of the variable reluctance rotary transformer.

[0046] It should be noted that the variable reluctance rotary transformer in step 104 is a variable reluctance rotary transformer based on a sinusoidal reluctance rotor.

[0047] The above steps will be further explained below with reference to specific embodiments.

[0048] Specifically, in a VR rotary transformer, the envelope of the output signal is generated by the change in air gap permeability length at different rotor positions. Therefore, considering the rotor pole arc width, the analytical form of the unit cosine envelope is:

[0049]

[0050] Among them, V x ′ Represents the unit cosine envelope waveform, k unit denoted by the per-unit factor, which is [value] in the four-pole rotor under study. i is a positive integer, and p represents the number of pole pairs. Therefore, the accuracy of the envelope is mainly affected by the air gap length δ(θ), which is determined by the rotor profile.

[0051] To achieve a sinusoidal output envelope, VR rotary transformers commonly use a sinusoidal rotor with high permeability, and its air gap permeability expression is shown in equation (2):

[0052] P(θ,t)′=P0+P amp cos(p(θ+ω m t)) (2)

[0053] Here, P(θ, t)′ represents the air gap permeability expression of a sinusoidal rotor, where P0 and P ampω represents the bias of the air gap permeability and the amplitude of the change in air gap permeability, respectively. m t represents the mechanical rotation speed, t represents time, and p represents the number of pole pairs.

[0054] Compared to traditional magnetic permeability sinusoidal rotors, this invention focuses on the research of magnetic reluctance sinusoidal rotors, whose air gap magnetic permeability expression is shown in equation (3).

[0055]

[0056] Where P(θ,t) represents the air gap permeability waveform of the reluctance sinusoidal rotor, P0 represents the bias value of the air gap permeability, and P amp ω represents the amplitude of the change in air gap permeability. m t represents the mechanical rotation speed, t represents time, and p represents the number of pole pairs.

[0057] Optionally, after obtaining the air gap magnetic permeability waveform of the reluctance sinusoidal rotor, the method further includes: determining the air gap length of the reluctance sinusoidal rotor; and determining the rotor configuration of the reluctance sinusoidal rotor based on the air gap length.

[0058] The expression for the air gap length is:

[0059] δ(θ,t)=δ min +k amp (1-cos(p(θ+ω m t))) (4)

[0060] Where, k amp δ represents the amplitude of the air gap length variation. min This represents the minimum air gap length.

[0061] This allows us to obtain a schematic diagram comparing the rotor shape with the air gap magnetic permeability waveform, as shown below. Figure 2 As shown. Among them, Figure 2 Image (a) shows the shape of the sinusoidal rotor and the air gap permeability waveform. Figure 2 Figure (b) shows the shape of the reluctance sinusoidal rotor and the air gap magnetic permeability waveform.

[0062] Furthermore, based on the analytical formula (1) of the unit cosine envelope waveform and the derivation of the air gap permeability waveform, the output cosine envelope waveforms of the permeability sinusoidal rotor and the reluctance sinusoidal rotor can be obtained respectively. Figure 3 The diagram shown is a comparison of the output cosine envelope of the magnetic permeability sinusoidal rotor and the magnetic reluctance sinusoidal rotor provided by this invention with fast Fourier analysis.

[0063] Figure 3(a) shows the output cosine envelope (waveform) of the magnetic permeability sinusoidal rotor, (c) shows the fast Fourier analysis results of the magnetic permeability sinusoidal rotor, (b) shows the output cosine envelope (waveform) of the magnetic reluctance sinusoidal rotor, and (d) shows the fast Fourier analysis results of the magnetic reluctance sinusoidal rotor.

[0064] Through the Figure 3 Analysis shows that the output envelope waveform of the reluctance sinusoidal rotor has a larger harmonic distortion than that of the permeability sinusoidal envelope, with a THD as high as 8.43%. Furthermore, based on the output cosine envelope waveform, the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform is determined to be the third harmonic component.

[0065] Based on the above embodiments, as an optional embodiment, the target stator tooth width of the variable reluctance rotary transformer is determined using the finite element simulation method with the goal of minimizing the amplitude of the target harmonic component. This includes: constructing a simulation model of a 4-pole, 16-tooth reluctance rotary transformer based on a reluctance sinusoidal rotor; and continuously adjusting the stator tooth width of the reluctance rotary transformer simulation model within a preset range to obtain the target stator tooth width.

[0066] Specifically, to further accurately analyze the output envelope waveforms of rotary transformers with magnetic permeability sinusoidal rotors and magnetic reluctance sinusoidal rotors, and to correct the harmonic amplitudes of the magnetic reluctance sinusoidal rotor, this invention constructs as follows: Figure 4 The topology of the 4-pole 16-tooth VR rotary transformer (i.e., the simulation model of the 4-pole 16-tooth reluctance rotary transformer) is shown, and finite element simulation is carried out based on JMAG.

[0067] in, Figure 4 (a) shows the topology of a reluctance sinusoidal rotor rotary transformer, and (b) shows the topology of a permeability sinusoidal rotor rotary transformer.

[0068] To compensate for the third harmonic of the sinusoidal reluctance envelope, this invention studies the width of the stator teeth. The width of the stator teeth significantly affects the leakage flux between them; as the width of the stator teeth increases, the leakage flux between them also gradually increases.

[0069] The leakage flux between stator teeth introduces a significant amount of third harmonics into the output cosine envelope. This third harmonic is compensated for by utilizing the leakage flux-induced third harmonics, which are inherent to the envelope of the reluctance sinusoidal rotor. The structural dimensions of the reluctance sinusoidal rotary transformer are set, and the relationship between the third harmonic amplitude, phase angle, and THD of the envelope of the reluctance sinusoidal rotary transformer (i.e., a variable reluctance rotary transformer based on a reluctance sinusoidal rotor) and the stator tooth width is as follows: Figure 5 As shown.

[0070] As the stator teeth gradually widen, the amplitude and envelope THD of the third harmonic gradually decrease, and the amplitude and THD of the third harmonic component reach their lowest values ​​at 4 mm, after which they gradually increase.

[0071] Based on the above analysis results, the output cosine envelope of two VR rotary transformers with different rotor configurations and a stator tooth width of 4mm at 1000rpm is as follows: Figure 5 As shown, the THD of the reluctance sinusoidal rotor envelope is only 0.54%. Furthermore, the THD of the reluctance sinusoidal rotor envelope based on finite element analysis is significantly lower than that calculated analytically, indicating that the inter-tooth leakage flux effectively compensates for the inherent third harmonic of the reluctance sinusoidal rotor envelope.

[0072] It is understood that the target stator tooth width of 4mm mentioned in this invention is merely a practical scenario (i.e., an example) for the specific embodiment described above, and is only applicable to the current structural dimensions of the aforementioned reluctance sinusoidal rotary transformer. When the structural dimensions of the reluctance sinusoidal rotary transformer change, the target stator tooth width will also change adaptively. However, the method for determining the target stator tooth width is the same for reluctance sinusoidal rotary transformers of different structural dimensions, and the general steps are as follows:

[0073] (1) Determine the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform of the current reluctance sinusoidal rotary transformer;

[0074] (2) Construct a curve showing the change in the amplitude (or THD value) of the target harmonic component with the stator tooth width of the current reluctance sinusoidal rotary transformer;

[0075] (3) Determine the current stator tooth width corresponding to the minimum value of the target harmonic component amplitude (or THD value), and use the current stator tooth width as the target stator tooth width.

[0076] Figure 6 This is a schematic diagram of the angle error of the reluctance sinusoidal rotary transformer and the permeability sinusoidal rotary transformer provided by the present invention. The aforementioned angle error is obtained through a filter rotary transformer demodulation system based on an open-loop angle observer, and the angle delay from the low-pass filter has been compensated. Figure 6 As can be seen, the angle error of the magnetic reluctance sinusoidal rotary transformer is 0.012 degrees (0.72 arc min), which is very close to the angle error of the magnetic permeability sinusoidal rotary transformer (0.01 degrees (0.6 arc min), indicating that the two have comparable performance.

[0077] It should be noted that the variable reluctance rotary transformer based on a sinusoidal reluctance rotor in this invention includes three sets of windings: a primary-side excitation winding, a secondary-side sinusoidal output winding, and a secondary-side cosine output winding. Each set of windings is centrally wound on the stator teeth, with each stator tooth containing two sets of windings. Specifically, the primary-side excitation winding is wound alternately on each stator tooth with positive and negative windings; the secondary-side sinusoidal output winding and the secondary-side cosine output winding are arranged alternately, with only one set of secondary-side windings on each tooth. The specific winding arrangement and number of turns on each stator tooth are as follows... Figure 7 As shown.

[0078] The present invention also provides an improved device for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, comprising:

[0079] The first module is used to obtain the air gap magnetic permeability waveform of the reluctance sinusoidal rotor;

[0080] The second module is used to determine the output cosine envelope waveform of the reluctance sinusoidal rotor based on the air gap magnetic permeability waveform and the unit cosine envelope waveform.

[0081] The third module is used to determine the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform, based on the output cosine envelope waveform.

[0082] The fourth module uses the finite element simulation method to determine the target stator tooth width of the variable reluctance rotary transformer, with the goal of minimizing the amplitude of the target harmonic components.

[0083] It should be noted that the improved variable reluctance rotary transformer based on a sinusoidal reluctance rotor provided in this embodiment of the invention can execute the improved variable reluctance rotary transformer based on a sinusoidal reluctance rotor described in any of the above embodiments during specific operation, which will not be elaborated in this embodiment.

[0084] The present invention also provides a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, wherein the variable reluctance rotary transformer is improved by applying the improved method of the variable reluctance rotary transformer based on a sinusoidal reluctance rotor as described in any of the above claims.

[0085] Specifically, the improved method for variable reluctance rotary transformers based on reluctance sinusoidal rotors described in the above embodiments can determine at least one or more of the following important parameters of the variable reluctance rotary transformer to improve its performance:

[0086] The target stator tooth width, air gap length of the reluctance sinusoidal rotor, and rotor configuration of the reluctance sinusoidal rotor.

[0087] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer is able to execute the improved method for a variable reluctance rotary transformer based on a reluctance sinusoidal rotor provided in the above embodiments, the method including: obtaining the air gap magnetic permeability waveform of the reluctance sinusoidal rotor; determining the output cosine envelope waveform of the reluctance sinusoidal rotor according to the air gap magnetic permeability waveform and the unit cosine envelope waveform; determining the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform according to the output cosine envelope waveform; and determining the target stator tooth width of the variable reluctance rotary transformer using a finite element simulation method with the minimum amplitude of the target harmonic component as the objective.

[0088] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the improved method for a variable reluctance rotary transformer based on a reluctance sinusoidal rotor provided in the above embodiments. The method includes: acquiring the air gap permeability waveform of the reluctance sinusoidal rotor; determining the output cosine envelope waveform of the reluctance sinusoidal rotor based on the air gap permeability waveform and the unit cosine envelope waveform; determining the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform based on the output cosine envelope waveform; and determining the target stator tooth width of the variable reluctance rotary transformer using a finite element simulation method, with the minimum amplitude of the target harmonic component as the objective.

[0089] 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.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, characterized in that, include: Obtain the air gap magnetic permeability waveform of the reluctance sinusoidal rotor; The output cosine envelope waveform of the reluctance sinusoidal rotor is determined based on the air gap magnetic permeability waveform and the unit cosine envelope waveform. Based on the output cosine envelope waveform, determine the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform; Using the finite element method, the target stator tooth width of the variable reluctance rotary transformer is determined with the goal of minimizing the amplitude of the target harmonic component.

2. The improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor according to claim 1, characterized in that, The specific formula for obtaining the air gap permeability waveform of a sinusoidal reluctance rotor is as follows: ； in, This represents the air gap permeability waveform of a sinusoidal reluctance rotor. This represents the bias value of the air gap permeability. This represents the amplitude of the change in air gap permeability. Indicates the mechanical rotation speed. t Indicates time, Represents the extreme logarithm.

3. The improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor according to claim 2, characterized in that, The analytical formula for the unit cosine envelope waveform is: ； in, Represents the unit cosine envelope waveform. Represents the per-unit coefficient. This represents half of the rotor pole arc angle. It is a positive integer.

4. The improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor according to claim 2, characterized in that, After obtaining the air gap magnetic permeability waveform of the reluctance sinusoidal rotor, the process further includes: Determine the air gap length of the reluctance sinusoidal rotor; The rotor configuration of the reluctance sinusoidal rotor is determined based on the air gap length.

5. The improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor according to claim 4, characterized in that, The expression for the air gap length is: ； in, This indicates the amplitude of the air gap length variation. This represents the minimum air gap length.

6. The improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor according to claim 1, characterized in that, The target harmonic component is the third harmonic.

7. The improved method for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor according to claim 1, characterized in that, The method of using finite element simulation to determine the target stator tooth width of the variable reluctance rotary transformer, with the goal of minimizing the amplitude of the target harmonic component, includes: A simulation model of a 4-pole, 16-tooth reluctance rotary transformer based on a reluctance sinusoidal rotor is constructed. The stator tooth width of the reluctance rotary transformer simulation model is continuously adjusted within a preset range to obtain the target stator tooth width.

8. An improved device for a variable reluctance rotary transformer based on a sinusoidal reluctance rotor, characterized in that, include: The first module is used to obtain the air gap magnetic permeability waveform of the reluctance sinusoidal rotor; The second module is used to determine the output cosine envelope waveform of the reluctance sinusoidal rotor based on the air gap magnetic permeability waveform and the unit cosine envelope waveform. The third module is used to determine the target harmonic component that contributes the most to the total harmonic distortion of the output cosine envelope waveform, based on the output cosine envelope waveform. The fourth module uses the finite element simulation method to determine the target stator tooth width of the variable reluctance rotary transformer, with the goal of minimizing the amplitude of the target harmonic components.

9. A variable reluctance rotary transformer based on a sinusoidal reluctance rotor, characterized in that, The variable reluctance rotary transformer is improved using the variable reluctance rotary transformer improvement method based on a sinusoidal reluctance rotor as described in any one of claims 1 to 7.

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