This paper presents a simple method for speed
control of induction motors on the basis of direct control of the
stator flux modulus. The proposed method needs neither
mechanical sensor nor current transducers, so it can be
compared with "Variable Voltage Variable Frequency (vIi)"
method. High-speed operation of induction motor controlled
by the proposed method is compared with that of vlf method
that leads to the fact that in addition to control of motor
dynamic behavior, the proposed method uses DC-link voltage
in a more efficient way. In the stator flux modulus control, the
amplitude of electromagnetic torque ripple and average
switching frequency are computable and analytical formulas
for calculation of them are derived. The performance of
proposed method and accuracy of presented formulas are
validated in MATLAB/Simulink