Simulation and Modeling of Feedback Field Oriented Control of an Asynchronous Machines

There are two types of controlling of induction motors: scalar controlling and vector controlling. This paper will focus on the vector control. Vector Controlling is again having two types one is field oriented control and second is direct torque control. In this paper we will focus on field oriented control of induction machine.

When field oriented-control techniques are applied to induction machines, a torque response like DC Machine may be achieved, making the induction machine a viable candidate for applications previously dominated by other electric machines so the basic of separately excited DC Machine can be taken to understand the FOC up to some extent. Some applications, however, demand high performance over a wide range of operating conditions. The field-oriented techniques needed to achieve the desired performance for which it works on two synchronously rotating axis which earlier converted by two stationary axis and by three stationary axis by using particular transformations theory.

This paper presents a new feedback field oriented controller, for which voltage based model flux estimator and current based model flux estimators are designed, along with their derivations using the trapezoidal rule for improved accuracy and stability. These estimators are then combinedly implemented into a feed-back field-oriented controller using many subsystems. The resulting controller achieves an acceptable level of performance over a range of operating conditions.