关键词: 解码系统, AD7606芯片, 坐标旋转数字计算算法, 旋转变压器

Abstract: Obtaining rotor position of permanent magnet synchronous motor (PMSM) through rotary transformer is the key technology of metro PMSM traction system. There is a small range of the measuring degree in the traditional CORDIC algorithm.A hardwave decoding algorithm covering 360° was derived. The advantage that the data can be classified was fully exploited, and the number of data was extended from 16 bits to 20 bits.By using this new algorithm, the rotary transformer decoding system of multiple PMSM through AD7606 was proposed.Based on the simulation results,the function of decoding by the four rotary transformers can be realized with high precision in short time.