旋转变压器信号的标定与解调

Calibration and Demodulation of Resolver Signal

针对检波后信号存在直流偏置、幅值不等和相位偏移等问题,采用梯度估计算法,对检波后的包络信号进行离线标定;并设计了基于状态观测器的旋转变压器-数字转换(RDC)算法,对标定后的包络信号进行解调。试验结果表明,梯度估计算法收敛速度快,估计精度高。与反正切法相比,所设计的RDC算法不需通过数值差分即可获得角速度信息,干扰抑制能力强,角位置和角速度估计精度高。

To against the problems of detection signals of resolver,e. g.,DC bias,amplitude deviation and phase shift,by using gradient estimation algorithm,the envelop signal after detection is calibrated offline,the resolver to digital conversion（RDC） algorithm based on state observer is designed for demodulating the envelop signal after detection. The result of experiments indicates that the gradient estimation algorithm features fast convergence speed,high estimation accuracy. Comparing with the arctangent method,the RDC algorithm proposed is able to obtain information of angular velocity without numerical differential operation,and features high capability of eliminating interference,and high accuracy for estimating angular position and angular velocity.