Traction motor current control apparatus

Details Traction motor current control apparatus Traction motor current control apparatus

H - Electricity

02

M

323/11

H02M 5/04 (2006.01) H02M 3/135 (2006.01)

Patent

CA 1118492

47,288 TRACTION MOTOR CURRENT CONTROL APPARATUS ABSTRACT OF THE DISCLOSURE 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 estab- lished 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 capability. 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.

303699

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