318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
727 | DF | INDUCTION MOTOR SYSTEMS {12} |
818 | DF | .~ Secondary circuit control {3} |
821 | DF | .~.~ Impedance control of secondary circuit {2} |
822 | DF | .~.~.~ Responsive to motor condition {4} |
823 | DF | .~.~.~.~ Rotor speed or position responsive {1} |
824 | .~.~.~.~.~ Centrifugal force of rotor controls secondary circuit impedance |