Resolver harmonic error software self-compensation system based on same-frequency wave trap

Abstract

The invention relates to a resolver harmonic error software self-compensation system based on a same-frequency wave trap. The resolver harmonic error software self-compensation system comprises a servo control unit, an error evaluation unit, an error identification unit and an error compensation unit, and the servo control unit is used for controlling the load to stably rotate according to the command angular speed. The error evaluation unit sends an instruction angular speed to the control servo control unit, performs spectral analysis on the measured angular speed output by the servo controller, and transmits an error harmonic frequency N obtained by spectral analysis to the error identification unit and the error compensation unit to serve as a basis for adjusting error identification and error compensation. The error identification unit uses a same-frequency wave trap constructed by adopting a correlation integral method to accurately identify the angle measurement error of the rotary transformer with the harmonic order of N to obtain an error sine quantity and an error cosine quantity. The error compensation unit reconstructs an error according to the error sine quantity and the error cosine quantity obtained by the error identification unit, and performs error compensation on the output original angular position of the rotary transformer.

Description

technical field [0001] The invention relates to a resolver harmonic error software self-compensation system. 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 obtains the envelopes of the two AM signals through wave detection, and then uses a demodulation algorithm to obtain angular position information. Ideally, the envelope signal after detection should be a quadrature sine-cosine signal, but due to factors such as transformer output signal amplitude asymmetry, non-ideal quadrature, inductance harmonics, carrier reference signal phase offset and other factors, the detected envelope signal The envelope signal often contains DC offset, amplitude asymmetry and phase offset, plus the demodulation error of the demodulation chip, resulting in a certain angle measurement error of the resolver. [0004] T...

AI Technical Summary

Problems solved by technology

This compensation method needs to purchase an ultra-high-precision angular position sensor, and requires the compensated resolver to have a mechanical adapter interface and design an ultra-high-precision adapter tool to install an ultra-high-precision angle sensor, which requires extremely high assembly accuracy. , using this method to compensate the high-order harmonic error of the resolver must be accurately traced, the process is complicated, online compensation cannot be performed, and it is inconvenient to use

Images