Self-correction for resolver second harmonic angle measurement error
The resolver amplitude error and quadrature error are expressed in the angular velocity spec-trum as the second harmonic of the rotational frequency,which is the main source of the resolver angle measurement error and affects the angular velocity control accuracy and stability of the servo system.In this paper,a self-correction method for the second harmonic error of resolver based on characteristic fre-quency reference was proposed.Firstly,the mechanism of the resolver error was analyzed,and the mutu-al irrelevance of the amplitude error and quadrature error was obtained,and it was proved that the second harmonic error correction could be realized by adjusting the amplitude and phase difference of the resolver output signal.Then,the amplitude corrector based on proportional amplification and the phase angle cor-rector based on cross-adjustment were designed between the resolver and the Resolver-to-Digital Convert-er(RDC).Finally,according to the constant characteristic frequency of the error signal in the linear con-trol system,the servo system was controlled at a constant speed,and the amplitude of the second harmon-ic frequency in the angular velocity spectrum was used as the reference to adjust the amplitude corrector and phase corrector respectively,to correct second harmonic errors.The experimental results show that the method can reduce the second harmonic angle measurement error of the resolver by 78.5%,and the speed fluctuation of the servo system can be reduced by 40.5%.The method realizes the self-correction of the second harmonic error of the resolver,and can greatly improve the measurement accuracy of the resolv-er and the rotation stability of the servo system.
angel position sensorresolverangle measurement errorself-correction
万方数据
维普
