Title :
A wound-rotor induction motor closed-loop control system
Author :
Rezek, Angelo J J ; Da Silva, Valberto F. ; Nakashima, Kazuo ; Campos, Anderson L S ; Santos, Claudio C J ; Junior, N.O. ; Da Silva, Pedro P.
Author_Institution :
Dept. de Electrotecnica, Escola Federal de Engenharia de Itajuba, Brazil
Abstract :
A subsynchronous cascade system implemented in the laboratory permits motor speed control by using two cascade-connected governors (the first for speed and the second for current), to fire the inverter of the rotor DC link. A diode bridge is connected to the rotor terminals and the thyristorized inverter is connected to the line by means of an autotransformer. This system makes it possible to recover the rotor energy when compared to the conventional rotor resistance variation, that causes an energy dissipation in the rotor circuit. The torque speed curves have been traced by modifying the inverter firing angle and the load torque. These curves are polemical in the literature and laboratory tests permit the determination of their real aspect. Current and speed are registered, when a load disturbance torque takes place, to confirm the speed regulation and the current
Keywords :
autotransformers; bridge circuits; closed loop systems; electric current control; induction motors; invertors; machine control; power convertors; rectifiers; rotors; thyristor applications; torque; velocity control; autotransformer; cascade-connected governors; closed-loop control system; current control; energy dissipation; inverter; inverter firing angle; load disturbance torque; load torque; rectifier diode bridge; rotor DC link; rotor circuit; rotor energy recovery; rotor resistance variation; rotor terminals; speed control; subsynchronous cascade system; thyristorized inverter; torque speed curves; wound-rotor induction motor; Control systems; DC motors; Diodes; Fires; Induction motors; Inverters; Laboratories; Rotors; Torque; Velocity control;
Conference_Titel :
Industrial Electronics, 1994. Symposium Proceedings, ISIE '94., 1994 IEEE International Symposium on
Conference_Location :
Santiago
Print_ISBN :
0-7803-1961-3
DOI :
10.1109/ISIE.1994.333147
