H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/118
H02P 25/26 (2006.01)
Patent
CA 1076198
ABSTRACT OF THE DISCLOSURE A modified three-phase bridge circuit, incorp- orating resistors and thyristors connected in specific configuration in one leg of each phase circuit and diodes in a second leg, is adapted for connection to the motor rotor. A speed control signal modulated with a triangular waveform of predetermined frequency, below the instant- aneous rotor frequency, is applied to a plurality of AND circuits acting as pulse width modulators. Each AND circuit has an output coupled to the gate of one thyristor in each phase circuit. Changes in speed control signal representative of calls for increasing speed produce sequentially on successive outputs, a train of pulses increasing in pulse width to full turn on. Additional tyristors are thus gated on in each phase circuit to modify the effective resistance presented by the resistors in each leg so as to smoothly decrease the resistance of the bridge circuit.
284196
Company General Electric
Na
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