A self-compensation method for resolver error based on characteristic frequency analysis using resister network

The resolver error caused by its sine and cosine output of non-orthogonal and non-equal amplitude is second harmonic of the resolver velocity. The resolver error seriously reduces the accuracy of angular velocity of the Control Moment Gyro (CMG). Stability, it reduces the output torque accuracy of CMG. To compensate the resolver angle measurement error, a self-compensation method for resolver error based on characteristic frequency analysis using resister network is proposed. The amplitude corrector and phase corrector are added between the resolver and the Resolver-to-Digital Converter (RDC). Resolver is rotated at a constant speed. The amplitude corrector and phase corrector are adjusted according to the spectrum analysis of RDC velocity. In the end, the resolver error is greatly reduced.