Position control of a LBDCM drive

In this paper, the dynamic model estimation and quantitative position contr ol of a linear brushless DC motor (LBDCM) drive are studied. First, the inv erter-fed LBDCM drive is established and its dynamic model is estimated fro m measurements. Then, according to the estimated model at nominal case, a t wo-degree-of-freedom controller (2DOFC) is designed to meet the prescribed tracking and load regulation position control responses. As the, system par ameter and operating condition changes occur, an output feedback linear mod el following controller (MFC) is added to reduce. the effects of perturbati ons, and hence the performance degradation can be reduced. Finally, a ramp position command with suitable changing rate is generated to avoid the occu rrence of velocity limitation, and thus the overshoot of position response due to large-step command change can be eliminated.