A new frequency characteristic automated test method is proposed based on the digitization characteristics of the electromechanical actuator

then the system model of electromechanical actuator is identified

after further a series-wound corrector is designed to correct for the system. First the entire automated test process and data uploaded to the PC is controlled by the digital processing controller. Then these frequency characteristic tested data is identified to the high precision transfer function through using the Levy method. In the low and intermediate frequency

the maximal absolute error of magnitude between identified data and tested data is less than 0.8dB and the maximal absolute error of phase is less than 1.1°.On the basis of the transfer function

a lag-lead corrector is designed for the system

and the bandwidth of the corrected system is 138rad/s

which is better than 124rad/s by theory calculated. The corresponding experiments have been carried out

and the results show that the frequency characteristic test method has a high degree of automation

the identified transfer function has higher precision and the lag-lead corrector is suitable for the system. The whole process for the development of high-performance electromechanical actuator servo system provides a theoretical basis and engineering guidance.