| Abstract |
Induction motors are relatively cheap and rugged machines. Only a closed loop
control of the motor meets the requirements including fast dynamic response,
accurate speed and torque control or even a higher efficiency by means of flux
optimization. However, the speed sensor has several disadvantages from the
viewpoint of drive cost, reliability and signal noise immunity. This paper deals
with the speed control of induction motor drives without a shaft sensor. Here, a
new model for speed estimation is proposed. Its structure is based on the Extended
Kalman Filter theory. A 1,5 kW induction motor experimental system has been
built to verify this approach. Experimental results are presented to demonstrate the performance of the system. |
