Forced dynamics position control of the drive with linear PMSM

Design and verification of forced dynamics position control of a drive with a linear permanent magnet synchronous motor is presented. This control method is a relatively new one and using the principles of feedback linearisation offers an accurate realisation of a dynamic speed and position response, which can be selected for a given application by the user. In addition to this, the primary part current vector and the moving part flux vector are maintained mutually perpendicular as in conventional vector control. The control system has the cascade structure with an outer position control loop and an inner speed control loop. To achieve the defined speed response, the derived control law requires estimation of an external force, which is obtained from an observer. The overall control system is verified by simulations and experimentally. Preliminary experimental results confirmed that the moving part position response follows the prescribed one fairly closely.