| Abstract |
This paper proposes a control strategy for a sensorless torque control when an induction machine isdriven with the adaptive full-order observer. In low speed and low torque reference region, themagnitudes of stator voltage and current which are the inputs of the adaptive full-order observer forthe sensorless control are too small. And, the frequency is too low to obtain the high performancesensorless torque control. In order to enhance the control performance of the sensorless torque control,the proposed strategy modifies the d- and q-axis current references in the synchronous reference frameconsidering the current limit, voltage limit, the rated slip frequency and the magnetizing currentconditions. Even though the current reference is modified for the better performance, the generatedtorque is kept as a constant value. Based on the proposed strategy, the performance of sensorlesstorque mode control can be improved remarkably even in the low speed and low torque operation.Validation of the proposed strategy is evaluated at 7.5kW experimental setup. |
