【摘要】 讨论了小波理论应用于控制领域的可能性，通过对交流同步电机驱动的半闭环伺服系统进行的仿真研究证明，交流同步电机电磁转矩的二阶或三阶小波变换对末端速度的变化比电磁转矩本身更为敏感，根据电磁转矩的二阶或三阶小波变换极大模值的幅度和稠度，可以识别出速度变化的起始时间、终止时间和变化幅度。更多还原

【Abstract】 The paper reviews the different characteristics of the servo systems in application of DC motor,induction motor and permanent magnet motor.A new structure of the permanent magnet synchronous motor (PMSM) is introduced.The model of PMSM is founded and the field oriented vector control is adopted.Finally,the PMSM servo system wint optical electronic encoder as th sensor is designed.The experiment results and conclusions are presented.更多还原