| Abstract |
Field oriented control has been successfully applied to induction motors in variable speed and servo drives. Using fast microprocessors and signal processors in a digital controller, even the current control loop can be closed in software. This eliminates most of the analogue components in previous designs. The inverter is driven by a digital pulse width modulator, that is controlled by software. Together with high resolution, high bandwidth speed and position sensing based on only one optical device for both purposes, a servo system can be developed, which outperforms dc-servo drives. |
