The direct thrust force control scheme of permanent magnet synchronous linear motor is mainly inspired by the direct torque control of its rotating counterparts, so as to achieving excellent force characteristics. However, due to the inherent characteristics of permanent magnet linear synchronous motor, such as open-wide air gap, small equivalent inductance and large mechanical time constant, the control performance of traditional direct thrust control algorithm is greatly deteriorated, which are of prime concern. In this paper, the traditional direct thrust control of permanent magnet linear synchronous motor is analyzed strictly, with the limitations pointed out. Contributed to the concept of predictive control, by optimizing of switching vector and introduction of disturbance observer, the thrust performance of direct thrust force control is improved. At the same time, switching frequency can be optimized, thrust and flux ripple can be suppressed, and outer loop control performance can be improved, when compared to the state of the art.

Permanent magnet synchronous linear motor， direct thrust force control， disturbance observer