CONTROL SYSTEM FOR INDUCTION MOTOR DRIVE WITH NO SPEED SENSOR, OBSERVER, AND CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a control system, an observer, and a control method which achieves a stable control over the vast range of an induction motor drive with no speed sensor. SOLUTION: Observed magnetic flux and estimated speed is derived and outputted based on a feedback gain K, by determining the feedback gain K using the observed error ei of the current of the stator. Control of the induction motor is made based on the observed magnetic flux and the estimated speed.