A stator electromagnetic structure optimization design method for high-precision multi-pole reluctance resolver

Abstract

The invention discloses a method for optimizing the stator electromagnetic structure of a high-precision multi-pole reluctance resolver, comprising: performing harmonic analysis on the sine voltage signal and the cosine voltage signal of the reluctance resolver to determine the amplitude and phase of each order harmonic of the sine voltage signal and the cosine voltage signal; and performing anti-phase correction on the stator teeth and the stator yoke of the reluctance resolver according to the amplitude and the phase to improve the sinusoidality of the sine voltage signal and the cosine voltage signal of the reluctance resolver.

Description

Technical Field

[0001] The invention relates to the technical field of rotary transformers, and in particular to a method for optimizing the stator electromagnetic structure of a multi-pole reluctance rotary transformer. Background Art

[0002] Nowadays, the reluctance resolver (referred to as "reluctance resolver") has been extended from its initial application in the military field to civilian electromechanical systems, such as machine tools, new energy vehicles, etc. Reluctance resolvers are particularly suitable for accurate measurement of angles and angular velocities in extremely harsh environments due to their simple structure and reliability.

[0003] The magnetoresistive resolver is composed of magnetic silicon steel sheets and enameled wires, as well as auxiliary components such as skeletons and connectors. The structure is very simple. Due to the simple structure, the accuracy is not as high as that of optical encoders, magnetic encoders and other sensors. Due to mold errors, winding and wiring consistency errors, material permeability errors and other reasons in the production process, the electrical error of the magnetoresistive resolver will deviate from the design expectations. Therefore, once the structure design of the magnetoresistive resolver is finalized, the electrical error of the product will be relatively high, and it is difficult to reduce it through process methods.

[0004] Therefore, there is an urgent need for a method that can improve the electrical error accuracy of the reluctance resolver without causing repeated trial production and high development costs. Summary of the invention

[0005] The main purpose of the present invention is to propose a method for optimizing the stator electromagnetic structure of a high-precision multi-pole reluctance resolver, and to perform sinusoidal correction on the output voltage signal of the reluctance resolver by removing or adding material, so as to improve the sinusoidality of the sine and cosine signals of the reluctance resolver, thereby reducing the electrical error of the reluctance resolver.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for optimizing the stator electromagnetic structure of a high-precision multi-pole reluctance resolver comprises: performing harmonic analysis on the sine voltage signal and cosine voltage signal of the reluctance resolver to determine the amplitude and phase of each order harmonic of the sine voltage signal and the cosine voltage signal; and performing anti-phase correction on the stator teeth and the stator yoke of the reluctance resolver according to the amplitude and the phase to improve the sinusoidality of the sine voltage signal and the cosine voltage signal of the reluctance resolver.

[0008] Furthermore, by performing harmonic analysis on the sinusoidal voltage signal and cosine voltage signal of the magnetoresistive resolver, the amplitude and phase of each order of harmonics of the sinusoidal voltage signal and the cosine voltage signal are determined, including: inputting the simulated sinusoidal voltage envelope and cosine voltage envelope into Matlab software respectively, and automatically calculating the amplitude and phase of each order of harmonics of the sinusoidal voltage signal and the cosine voltage signal through the harmonic analysis program.

[0009] Furthermore, based on the amplitude and phase, the stator teeth and stator yoke of the reluctance transformer are subjected to anti-phase correction, including: respectively calculating the correction positions of the sine voltage signal and the cosine voltage signal according to the harmonic phases of the sine voltage signal and the cosine voltage signal; and performing the anti-phase correction at the correction positions of the sine voltage signal and the cosine voltage signal.

[0010] Furthermore, the corrected positions of the sine voltage signal and the cosine voltage signal are calculated using the following formula:

[0011]

[0012] in, T The mechanical angle representing the corrected position of the sine voltage signal or cosine voltage signal, θ Represents the harmonic phase angle of the sine voltage signal or cosine voltage signal, P is the pole pair number; n represents the number of cycles, n= 0,1,2,3,….

[0013] Furthermore, the inverse correction includes material removal correction or material addition correction.

[0014] Further, the material removal correction includes performing material removal correction on a position where the harmonic amplitude is positive, and the material addition correction includes performing material addition correction on a position where the harmonic amplitude is negative.

[0015] Furthermore, the material removal correction includes drilling or milling.

[0016] Furthermore, the material addition correction includes pressing a magnetic cylinder into the stator hole or filling it with amorphous magnetic powder.

[0017] The beneficial effects of the technical solution of the present invention are as follows: the present invention corrects the sinusoidal nature of the output voltage signal of the reluctance resolver by an inverse correction method of removing or adding material, thereby improving the sinusoidal nature of the sine and cosine signals of the reluctance resolver, thereby reducing the electrical error of the reluctance resolver. It is suitable for fine optimization of the electromagnetic dimensions of the reluctance resolver product in the early stage of development or for precise debugging of high-precision reluctance resolvers. This high-precision multi-pole reluctance resolver stator electromagnetic structure optimization method is quick and simple, low-cost and high-precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram of the optimized stator electromagnetic structure of an embodiment of the present invention.

[0019] Figure 2 3 is a waveform diagram of a sine voltage signal and a cosine voltage signal in an embodiment of the present invention.

[0020] Figure 3 1 is a waveform diagram of the fundamental wave and its third harmonic of the sinusoidal voltage signal according to an embodiment of the present invention.

[0021] Figure 4 1 is a waveform diagram of the fundamental wave and its third harmonic of the cosine voltage signal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods and examples. It should be understood by those skilled in the art that the purpose of providing the examples is only for illustration and does not limit the protection scope of the present invention in any way.

[0023] In order to solve the problems of large error, difficult debugging and high development cost of high-precision reluctance resolver, an embodiment of the present invention provides a stator electromagnetic structure optimization design method for a high-precision multi-pole reluctance resolver, the method comprising: determining the amplitude and phase of each order harmonic of the sine voltage signal and the cosine voltage signal by performing harmonic analysis on the sine voltage signal and the cosine voltage signal of the reluctance resolver; performing anti-phase correction on the stator teeth and the stator yoke of the reluctance resolver according to the amplitude and phase of the sine voltage signal and the cosine voltage signal, after the stator is corrected, the amplitude of each order harmonic is corrected to 0, which means that when the waveform is subjected to harmonic analysis, only the fundamental wave is equal to the pure sine waveform, thereby achieving the purpose of correcting the magnetic field distribution to make the magnetic field distribution uniform and symmetrical, and improving the sinusoidality of the sine voltage signal and the cosine voltage signal of the reluctance resolver.

[0024] In some specific implementations, the anti-phase correction includes: removing material from the position where the harmonic amplitude is positive, and adding material to the position where the harmonic amplitude is negative. The magnitude of the absolute value of the harmonic amplitude of each order represents the influence of the harmonic of this order on the electrical error. Specifically, the material removal correction includes methods such as drilling and milling, and the material addition correction includes methods such as pressing a magnetic cylinder into the stator hole and filling amorphous magnetic powder.

[0025] In some specific implementations, we can use simulation software such as Matlab to perform harmonic analysis to determine the amplitude and phase of each order of harmonics of the sine voltage signal and the cosine voltage signal. Specifically, the simulated sine voltage envelope and cosine voltage envelope are respectively input into the Matlab software, and the amplitude and phase of each order of harmonics of the sine voltage signal and the cosine voltage signal can be obtained by automatic calculation through the harmonic analysis program, which will not be repeated.

[0026] After obtaining the amplitude and phase of each order harmonic of the sine voltage signal and the cosine voltage signal, the correction position of the sine voltage signal and the cosine voltage signal is calculated according to the corresponding harmonic phase, and then a specific inversion correction is performed at the correction position. The correction position can be determined by the following formula:

[0027] (1)

[0028] in, T To correct the mechanical angle of the position, θ is the harmonic phase angle, P is the pole pair number; n is the number of cycles, which can be any integer in the range ≥ 0, that is, n= 0,1,2,3,…, different n , representing different positions on the stator outer ring, but different n， When determining the correction position of the sinusoidal voltage signal, substitute the harmonic phase angle of the sinusoidal voltage signal obtained after harmonic analysis into the above formula. θ ; When determining the correction position of the cosine voltage signal, substitute the harmonic phase angle of the cosine voltage signal obtained after harmonic analysis into the above formula θ .

[0029] The specific operation of the technical solution of the present invention is described below through a specific embodiment.

[0030] Figure 1 The figure shows a magnetoresistive resolver body 1 with three pole pairs. Figure 2 The waveforms of the sine voltage signal and cosine voltage signal of the magnetoresistive resolver are shown in FIG. By performing harmonic analysis on the sine and cosine signals of the three-pole magnetoresistive resolver, the amplitude and phase of each order of harmonics of the sine and cosine voltage signals are determined. Figure 3 As shown in the figure, it is the fundamental wave of the sinusoidal voltage signal and its third harmonic waveform. The amplitude and phase of the third harmonic of the sinusoidal voltage signal are: +300mV, 80°; Figure 4 As shown, it is the waveform diagram of the fundamental wave and the third harmonic of the cosine voltage signal. The amplitude and phase of the third harmonic of the cosine voltage signal are: +200mV, 170°.

[0031] Next, the above formula (1) is used to calculate the corrected position according to the phase angle of the harmonic, where n The value of is any value within the aforementioned range (0,1,2,3,…), and the periodic law is that the voltage of all cycles is superimposed to form the output signal voltage, so the correction effect is the same in any cycle. In this example, for the sinusoidal voltage signal, n =1, for the cosine voltage signal n = 0, we get:

[0032] The corrected position of the sine voltage signal is 176.67 degrees (mechanical angle), and the corrected position of the cosine voltage signal is 86.67 degrees (mechanical angle).

[0033] Finally, the stator yoke of the reluctance resolver is corrected according to the amplitude and phase. Since the amplitudes of the third harmonics of the sine voltage signal and the cosine voltage signal are both positive in the above example, material removal correction is performed. Specifically, the punching and material removal method is used for correction, such as Figure 1 As shown, from the 0 degree angle, go clockwise (or counterclockwise) along the winding direction to find 176.67 degrees (mechanical angle) to drill the sine signal correction hole 3, which is a through hole with a diameter of 1.5mm; drill the cosine signal correction hole 2 at 86.67 degrees (mechanical angle), which is a through hole with a diameter of 1mm. After such correction, Figure 1 The electrical error of the magnetoresistive resolver shown is reduced from 35 points before correction to 18 points, thereby verifying the effectiveness of the optimization design method of the embodiment of the present invention.

[0034] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for optimizing the stator electromagnetic structure of a high-precision multi-pole reluctance resolver, characterized in that: include: By performing harmonic analysis on the sinusoidal voltage signal and the cosine voltage signal of the magnetoresistive resolver, the amplitude and phase of each order harmonic of the sinusoidal voltage signal and the cosine voltage signal are determined; According to the amplitude and phase, the stator teeth and the stator yoke of the reluctance resolver are corrected in anti-phase to improve the sinusoidality of the sinusoidal voltage signal and the cosine voltage signal of the reluctance resolver; The reverse phase correction includes: removing material correction at the position where the harmonic amplitude is positive, and adding material correction at the position where the harmonic amplitude is negative; The material removal correction includes drilling or milling, and the material addition correction includes pressing a magnetic cylinder into the stator hole or filling it with amorphous magnetic powder.

2. The stator electromagnetic structure optimization design method according to claim 1, characterized in that: By performing harmonic analysis on the sinusoidal voltage signal and cosine voltage signal of the magnetoresistive resolver, the amplitude and phase of each order harmonic of the sinusoidal voltage signal and cosine voltage signal are determined, including: The simulated sine voltage envelope and cosine voltage envelope are input into Matlab software respectively, and the amplitude and phase of each order harmonic of the sine voltage signal and cosine voltage signal are automatically calculated by the harmonic analysis program.

3. The stator electromagnetic structure optimization design method according to claim 1, characterized in that: According to the amplitude and phase, the stator teeth and the stator yoke of the reluctance resolver are corrected in reverse phase, including: Calculating the corrected positions of the sine voltage signal and the cosine voltage signal respectively according to the harmonic phases of the sine voltage signal and the cosine voltage signal; The anti-phase correction is performed at the correction positions of the sine voltage signal and the cosine voltage signal respectively.

4. The stator electromagnetic structure optimization design method according to claim 3, characterized in that: The corrected positions of the sine voltage signal and the cosine voltage signal are calculated using the following formula: ； in, T The mechanical angle representing the corrected position of the sine voltage signal or cosine voltage signal, θ Represents the harmonic phase angle of the sine voltage signal or cosine voltage signal, P is the pole pair number; n represents the number of cycles, n= 0,1,2,3,….

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