Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-12-14
1998-01-06
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
363 71, H02P 700
Patent
active
057059098
ABSTRACT:
A control for an AC motor has first and second sets of three-phase stator windings wound physically in parallel and a three-phase inverter for each set. A first current sensor is responsive to a first phase current of the first set of three-phase stator windings; and a second current sensor is responsive to a phase current of the second set of three-phase windings other than that corresponding to the first phase current of the first set of three-phase windings. The control is responsive to signals from the first and second current sensors to generate a set of motor phase voltage control signals, which are provided to first and second three-phase inverters connected across a source of DC electric power. The first three-phase inverter uses semiconductor switches responsive to the set of motor phase voltage control signals to generate operating voltages in the first set of three-phase windings; and the second three-phase inverter uses semiconductor switches responsive to the set of motor phase voltage control signals to generate operating voltages in the second set of three-phase windings. The control thus eliminates two current sensors, two current controllers and a PWM pulse generator of the prior art for a reduction in cost and improvement in reliability.
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General Motors Corporation
Sigler Robert M.
Wysocki Jonathan
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