The response of an induction motor following a supply or load change consists typically of two stages, namely an initial acceleration/deceleration stage and a steady-state stage. Based on this observation, this paper presents a two-stage speed control method, which involves the control of current amplitude and frequency. The controller is easy to implement and is not affected by motor parameter changes. For evaluating the controller performance, this paper presents a modelling of the induction motor based on the two-axis theory of revolving frame transformation. This model takes stator current and load torque as inputs and gives speed as output. Satisfactory performance of the two-stage controller has been obtained from a simulation study on a 7.5 kW induction motor using the software Matlab/Simulink.
|Number of pages||8|
|Journal||International Journal of Power and Energy Systems|
|Publication status||Published - 1999|