A vector control method is applied to an induction motor controller for an elevator drive system. Conventional control methods to keep the secondary magnetic flux constant have a problem to decrease efficiency of an induction motor at balanced load to...
A vector control method is applied to an induction motor controller for an elevator drive system. Conventional control methods to keep the secondary magnetic flux constant have a problem to decrease efficiency of an induction motor at balanced load torque regions generated frequently in operating modes of elevator. Thus energy saving control method is suitable to improve the efficiency of an induction motor at balanced load torque regions by controlling ratio of secondary magnetic flux to torque as to minimize input power of an induction motor at a given motor torque even transient states. We analyzed the effect of the flux variance in the elevator drive, and we propose the suitable controller, The effects of the energy saving were verified m the actual elevator system drive.