CONSTANT_MOTOR_SPEED

Published:2009/7/22 1:21:00 Author:Jessie | From:SeekIC

Precise control of instantaneous voltage and current for power transistors gives 90% operating efficiency in driving 400-cps synchronous motor of portable lope transport from 28 v d-c. Negative 800-cps synchronizing pulses from precision oscillator are applied to base of Q3 to pro duce positive pulses at bases of Q1 and Q2, cutting them off quickly.-J. W. Caldwell and T. C. G. Wagner, Boosting Power Transistor Efficiency, Electronics, 31:47, p 86-88.



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