Traction motor current control apparatus

Details Traction motor current control apparatus Traction motor current control apparatus

1978-12-13

1981-03-17

Smith, Jr., David

Electric power conversion systems

Current conversion

Using semiconductor-type converter

307252M, 318345C, 318345G, 318341, H02M 332, H02P 728

Patent

active

042570921

ABSTRACT:
A direct current motor power controlling chopper apparatus is disclosed which determines the operational speed of one or more traction motors propelling a passenger vehicle along a track. The speed of the motor is established by changing the ON and OFF conduction ratio or duty cycle relationship of a thyristor switch device to determine the field current and the armature voltage of that motor. The present apparatus can provide a greater controlled range of motor speeds including a lower minimum OFF operation and a full ON capacity. In addition, the present apparatus provides greater reliability due to less thermal stress on the thyristor switch devices and fewer circuit elements required to provide an improved motor current control operation.

REFERENCES:
patent: 3544873 (1970-12-01), Gunsser et al.
patent: 3582764 (1971-06-01), Huber
patent: 3594629 (1971-07-01), Kawakami et al.
patent: 3614386 (1971-10-01), King
patent: 3660738 (1972-05-01), Anderson et al.
patent: 3753077 (1973-08-01), Anderson et al.
patent: 3784890 (1974-01-01), Geirsbach et al.
patent: 3841238 (1974-10-01), Thompson et al.
patent: 3879620 (1976-04-01), Akamatsu

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