General Resource Corporation

Ching-Chuan Chen

Christopher Hall

Michael John North

Thomas Mark Cyster

This invention provides a means to maintain the rotational speed and the relationship of the electromagnetic fields of a three phase induction motor and to determine the minimum voltage to excite the motor without it stalling. The three phase induction motor is driven by an inverter bridge circuit which converts DC input power into three phase AC output power. Feedback of the current provided to the inverter bridge circuit is split into positive and negative current flow periods which are used to determine appropriate changes to the three phase AC power magnitudes and phase angles. The inverter bridge circuit uses six insulated gate bipolar transistors to control the three phase AC power magnitude and phase angles.

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Keelung, Taiwan

Ching-Chuan Chen