The four-times-frequency design of feed-back signal of AC servomotor and the design of speed examination arithmetic of PMSM are completed and the linearity modulation of torque electric current is realized.

• 完成了交流伺服电动机反馈信号的四倍频电路、交流永磁同步电动机速度检测设计，实现了转矩电流的线性调节。