A hardware self-calibration system and method for resolver angle measurement error

Abstract

The invention relates to a hardware self-calibration system and method for an angle measurement error of a resolver, comprising: a servo control unit, an amplitude correction unit, a phase angle correction unit, and an error characterization unit. The servo control unit is used to control the load to rotate stably according to the commanded angular velocity. The amplitude correction unit is used to adjust the amplitude of the sine-cosine signal output by the resolver to eliminate the amplitude error. The phase angle correction unit is used to adjust the phase difference of the sine and cosine signals output by the resolver to eliminate the quadrature error. The resolver error characterization unit sends command angular velocity to the control servo control unit, conducts spectrum analysis on the calculated angular velocity output by the servo controller, and transmits the second harmonic amplitude Amp to the amplitude correction unit and phase angle correction unit as the adjustment amplitude The basis for the value correction unit and the phase angle correction unit. The invention is suitable for correcting and compensating the amplitude error and phase angle error of the resolver, and can greatly improve the angle measurement accuracy of the resolver.

Description

technical field [0001] The invention relates to a hardware self-calibration system and method for angle measurement error of a resolver. Background technique [0002] The resolver has high reliability and good adaptability to mechanical and thermal environments, and is widely used in the field of aerospace high-precision angle measurement. [0003] The resolver uses a dedicated demodulation chip to obtain the envelopes of the two AM signals through detection, and then obtains the angular position information through the demodulation algorithm. Ideally, the envelope signal after detection should be a quadrature sine-cosine signal, but due to factors such as asymmetry of the output signal amplitude of the resolver, non-ideal quadrature, inductance harmonics, and phase offset of the carrier reference signal, the detection The final envelope signal often contains DC offset, amplitude asymmetry and phase offset, which will cause large demodulation errors. Resolver demodulation ...

AI Technical Summary

Problems solved by technology

[0004] In summary, due to the inconsistency, non-orthogonality, and waveform distortion (function error) of the resolver output sine and cosine signal amplitudes, the error reflected in the angular velocity is the double frequency of the rotation frequency, which is the main component of the resolver angle measurement error. , which seriously affects the angle measurement accuracy of the resolver, which in turn affects the control accuracy of the servo system

[0005] The existing resolver error correction and compensation method is to use high-precision sensors to calibrate the resolver, and look up the table to compensate according to the calibration value. This process is carried out on the resolver assembly. Position changes, so there is a large compensation error

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