CONTROLLER FOR LINEAR SYNCHRONOUS MOTOR

PURPOSE:To make speed detection facilities unnecessary along a railway line by moving a train to a start position by a DC exciting portion during the stop of train, by controlling the phase of actual vehicle with the phase of a simulated vehicle portion moving almost the same as the actual vehicle and by switching from a separate control method to a speed electromotive force phase control. CONSTITUTION:A train 5 is moved to a start position through a power conversion section 4 to a DC excitation section 8 during the stop of the train. Next, a speed command Vp is output from a speed command section 1, and a current command value Ip is output from a follow-up control section 3 to a power conversion section 4 and a simulated vehicle section 10 by the deviation from an actual speed Vs of a synchronous control section 11. The actual train 5 and the simulated train 10 are started, velocities Vm and Vs are output and then input to the synchronous control 11 through a velocity phase converter 9 and a transfer switch SW2-a and are PLL-controlled and the actual speed Vs is output. When the separate control is repeated and the speed exceeds a predetermined value, a transfer to switch SW2-b is made and switching to speed electromotive force phase control occurs. By doing this, a number of position detectors can be omitted throughout the whole line.