MA Li xin, XU Zhen qian, FAN Hong cheng, Huang Yang long

 

(Optical electronic Information and Computer Engineering University of 

Shanghai for Science and Technology Shanghai 200093, China)

 

 

Abstract: Aiming at the change of inertia on PMSM servo system, one system based on PI parameters auto tuning was designed to solve the problem, and a new method of inertia identification based on motor mechanical equation was proposed. The acceleration was calculated by the acquired speeds at the same time intervals on the uniformly accelerated phase, applying this parameter the inertia was demodulated by the mechanical equation of the motor, then the PI parameters was compensated by the speed loop II system with zero based on the inertia, and this method and the traditional PI control method were experimented in the same environment simulation. The results indicate that inertia identification PI controller system compared with the traditional, starting without overshoot and the speed error decreases about 0.16%. This method has better dynamic and static performance and can be widely applied in high precision CNC system, so as to provide the basis for solving the change of inertia.

 

Key words: permanent magnet synchronous motor (PMSM); vector control; inertia identification; PI auto tuning