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Precisely Controlled 3-Phase Squirrel Cage Induction Motor Drives for Aerospace Applications

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1 Author(s)
Louis J. Lawson ; Lear Siegler, Inc. Power Equipment Division Cleveland, Ohio

The long sought means whereby complete control can be simply exercised over the speed and torque of a 3-phase squirrel cage induction motor has recently been reduced to practice and is currently in operation in full scale hardware. By means of an all solid-state cycloconverter type frequency changer power is supplied to the motor at a controlled frequency and voltage such that the motor is operated at controlled slip in a closed feedback system. In this loop the torque (and therefore, speed) can be instantaneously controlled. A low power level signal which varies the motor slip frequency is the controlling variable. The application of this concept to aerospace drives is discussed with particular attention given to servo-controlled antenna drive systems.

Published in:

IEEE Transactions on Aerospace  (Volume:AS-3 ,  Issue: 2 )