The constant v/f control method is one of
the most common speed control methods for Induction
motors (IMs). In this paper the performance of constant
v/f control method is improved by full compensation of
the stator resistance voltage drop by the injection of low
frequency boost voltage to achieve the rated torque speed
characteristic at any speed below rated speed.
Also simple frequency compensation based on
estimation of air-gap power and a linear motor torque speed
approximation is introduced. The dynamic
performance of IM for proposed system is studied by
MATLAB/SIMULINK under different load and speed
variations. Further the proposed system is compared
with the previous work. The simulation results show
that the speed accuracy of the proposed method is
improved effectively, even at low speed.