Force analysis of short pitch permanent magnet linear servo motor

A special geometry servomotor with short pitch and few teeth has been designed, studied and tested. The thrust forces of permanent magnet (PM) linear synchronous motor in static state are completely analyzed in this paper. Thrust forces are calculated at different positions and currents. Experiment results are presented for many situations also. It is confirmed according to the comparison results between simulating and experiment that these results are successful. The motor, which has high thrust force, little ripple force, little volume and mass, will be widely used in servo areas.