CONTROLLER FOR IN-TRACK LIM PRIMARY

摘要

A controller (30) for a vehicle (16) travelling along a track (12) is provided. The controller includes a pair of sensors (42, 44) disposed along the track which are located on either side of a LIM primary (34). The sensors output signals upon the detection of a vehicle passing thereover. A processor is in communication with the sensors and determines the velocity of the vehicle travelling along the path from the sensor output. A comparator (202) compares the detected velocity of the vehicle with the desired velocity of the vehicle at the vehicle's position along the track as determined by velocity profiles stored in the controller memory (260). A velocity controller (54b) generates velocity correction signals in response to the output of the comparator to operate the LIM primary in a manner to cause the vehicle to assume the desired velocity when the detected velocity is different from the desired velocity. A position controller (56) is also in communication with the processor and the controller memory and overrides the velocity controller when the vehicle is detected as being within a pre-determined distance from a vehicle stopping point along the track as determined by the velocity profile. The position controller generates velocity correction signals to cause the vehicle to stop at the stopping point when the position controller is operational. The velocity correction signals are supplied to a three phase voltage controller (50) connected between the LIM primary and a three phases power supply (32). The controller includes a plurality of switches (61 to 65) operable to connect and disconnect the LIM primary to one of the power supply phases. The controller includes sequencing means (68e) to connect sequentially the LIM to each phase and a delay circuit (68b) to inhibit the sequencing means until the voltage of the power supply reaches a desired level.