A Resolver Harmonic Error Software Self-compensation System Based on Co-frequency Notch

Abstract

The invention relates to a resolver harmonic error software self-compensation system based on the same frequency trap, including: a servo control unit, an error evaluation unit, an error identification unit, and an error compensation unit; the servo control unit is used to control the load according to the command angular velocity Steady rotation. The error evaluation unit sends an instruction angular velocity to the control servo control unit, conducts spectrum analysis on the measured angular velocity output by the servo controller, and transmits the error harmonic order N obtained by spectrum analysis to the error identification unit and error compensation unit as an adjustment error identification and error compensation unit. basis for compensation. The error identification unit uses the same-frequency trap constructed by the correlation integral method to accurately identify the angle measurement error of the resolver with the harmonic number N, and obtains the error sine and error cosine. The error compensation unit reconstructs the error according to the error sine quantity and the error cosine quantity obtained by the error identification unit, and performs error compensation on the original angular position output by the resolver.

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

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