PWM technique to control speed of induction motor using Matlab/xPC target box

Pulse Width Modulation (PWM) technique is proven to be an effective way of controlling speed of induction motor. This paper presents the development of the algorithm to perform the PWM operation using Matlab Simulink, which then was interfaced with the actual induction motor using the Matlab/xPC target box. The speed of induction motor was controlled through the I/O interface circuit and keypad; hence allowing the real time control. The control algorithm was designed such that the acceleration and deceleration ramps were included to avoid sudden speed change, which can destroy the motor. The control algorithm was also developed to enable the rotational direction switching. These functions are successfully carried out in Matlab simulation and in actual model. This method provides a means to control speed of induction motor remotely using a host PC, which may be connected through local area network or wireless network.