旋转变压器作为一种常用的电机转子位置检测装置，其检测精度直接影响整个控制系统的性能。为了获得高精度的转子位置信息，研究了一种结合误差补偿的软件旋变轴角数字转换器(RDC)。首先，研究采用基于三相同步参考坐标系锁相环(SRFPLL)的位置角求解方法，滤除旋转变压器输出信号中的高频抖动分量；然后，针对旋转变压器输出信号中的零位误差、正交误差和幅值误差的影响研究采用椭圆假设算法进行消除，并研究采用谐波分离法实现对信号中的谐波误差补偿；最后，搭建仿真模型和试验平台进行了分析验证。仿真与试验结果证明了所提方法的有效性。

The resolver is a commonly used motor rotor position detection device, and its detection accuracy directly affects the performance of the entire control system. In order to obtain highprecision rotor position information, a software resolvertodigital converter (RDC) combined with error compensation is analyzed. Firstly, the position angle solution method based on the threephase synchronous reference frame phaselocked loop (SRFPLL) is adopted to filter out the highfrequency jitter component in the resolver output signal. Then, aiming at the influence of the zero error, quadrature error and amplitude error in the resolver output signal, the ellipse hypothesis algorithm is used to eliminate it, and the harmonic separation method is proposed to realize the compensation of the harmonic error in the signal. Finally, a simulation model and test platform are built for analysis and verification. Simulation and test results verify the effectiveness of the proposed method.