Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1987-12-10
1993-10-12
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02P 700
Patent
active
052529053
ABSTRACT:
By employing a single phase pulse width modulated inverter system, a-c power line voltage may be effectively converted to single phase, variable amplitude and frequency sinusoidal voltage for driving a single phase a-c induction motor at an adjustable speed. The motor may be driven directly in response to the power line voltage (such as during start-up or when it is desired to run the motor at the power line frequency) by bypassing the inverter system and connecting the motor across the power line. Reduced energy consumption may be obtained by operating the motor in response to a reduced inverter output frequency. Switching the motor from the power line to the inverter, and vice versa, is accomplished without interruption. Immediately prior to each, switchover the inverter output voltage is synchronized to the power line voltage to minimize any electrical disturbance during the switching transition.
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Shaffer, Jr. Jacob E.
Wills Frank E.
Wysocki Jonathan
York International Corporation
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