Speed sensitive field weakening control for traction motors

Details Speed sensitive field weakening control for traction motors Speed sensitive field weakening control for traction motors

H - Electricity

02

P

318/96

H02P 7/282 (2006.01)

Patent

CA 1125846

ABSTRACT OF THE DISCLOSURE Disclosed herein is a control for a direct current motor including a field weakening winding, a field weakening resistor, a field weakening solenoid switch connected to the field weakening resistor and including a solenoid coil. Elect- ronic switching means are connected to the coil for selectively connecting it to a source of direct current, thereby operating the solenoid switch to connect the field weakening resistor in parallel with the field weakening winding. Speed sensor means are adapted to provide an electronic digital signal having a frequency proportional to motor speed. Also provided is a circuit adapted for receiving the digital signal and for providing an output signal for operating the electronic switch- ing means.

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