Takashi Umemori

Active-Synchronization Control System Used in DC Linear Motor

We developed recently a high speed DC linear motor which uses on-board normal-conducting DC electromagnets and air-core track coils to produce both thrust and lift. Subsequent research has been aimed at applying the linear motor to a new-type of railway system. Past of this research had been directed toward the train operation control system for the DC linear motor, and has resulted in the evolution of a new control system in which constant speed running and station stopping of trains are successfully achieved.

POWER SUPPLY AND CONTROL OF LINEAR THYRISTOR MOTORS

A train driven by a linear thyristor motor (LTM) moves by one pitch of the ground coil in every cycle of the power supply voltage. Therefore the vehicular speed is determined by the power supply frequency, and the travel distance is determined by the number of cycles of the supplied power source voltage. This means that the speed and location of the vehicle are monitored and controlled completely by the power supply system. Hence, no information channel is required at least theoretically which connects the vehicle with the ground station. This paper proposes a power supply and control system for LTM and confirms its operating performances using an outdoor loop-type model system with circumferential length of 100 m.