| 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 |