Design of position servo-system of BLDCM based on frequency domain method

Electro-Mechanical Actuator (EMA) is a typical position servo-system, widely used in many fields. The control architecture of EMA is usually implemented based on cascaded position, velocity and current loop. The BLDCM is more and more applied to EMA because of its small size, high efficiency, high power density and low rotor inertia. A Position Servo-System of BLDCM (PSSBLDCM) used in EMA is designed in this paper, and PID controllers are used in position loop, velocity loop and current loop. According to the frequency response requirement of the position loop, the frequency responses of the velocity loop and current loop can be obtained and a frequency domain method is used to design the PID controllers. Simulation of the system is done by using the SIMULINK, and the experimental system is implemented based on the DSP TMS320VC33 and FPGA CYCLONEIIEP2C35. The results show the PSSBLDCM can satisfy the requirements.