New electric drive controls speed of a polyphase as motor by varying frequency of inverter output. Closed-loop current-sensing circuit automatically adjusts frequency of voltage-controlled oscillator that controls inverter frequency, to limit starting and accelerating surges. Efficient inverter and ac motor would give electric vehicles extra miles per battery charge.
Alternating-Current Motor Drive for Electric Vehicles
NASA Tech Briefs ; 6 , 2
1982-11-01
Miscellaneous
No indication
English
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