Analysis of direct thrust force control for permanent magnet linear synchronous motor

This paper presents an investigation of direct thrust force control (DTFC) for permanent magnet linear synchronous motor because end-open structure of linear motor causes the special end-effect, which leads to new problems when the direct torque control (DTC) is applied to linear motors. It is theoretically illustrated that the principle of the DTC can be applied to linear motor control, and clear concepts about different reference frames, physical variables and action of voltage vectors are expounded. The special end-effect has been suitably taken so as to get thrust force response performance as good as possible. Simulation results show that the DTFC is effective in linear motor control systems.