Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-06-23
1997-09-23
Sircus, Brian
Electricity: motive power systems
Induction motor systems
Primary circuit control
318254, H02P 318
Patent
active
056708599
ABSTRACT:
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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Chen Ching-Chuan
Cyster Thomas Mark
Hall Christopher
North Michael John
General Resource Corporation
Prescott Larry J.
Saile George O.
Sircus Brian
LandOfFree
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