| Abstract |
This paper discusses high-speed, high-precision, robust torque and speed control techniques for a speed sensorless induction motor based on the instantaneous flux and slip calculation. The torque control system has proved to be insensitive to primary resistance (R1) variations and entirely robust to secondary resistance (R2) variations. However, the speed control system is only insensitive to R1 and still remains sensitive to R2 variations. A new method to solve this problem, with R2 identification, is proposed, using a specified harmonic component due to rotor slotting. The real R2 value is obtained during on-line operation by correcting the nominal R2 value according to the error signal between the calculated speed and actual speed detected from the frequency of the harmonic. |
