Speed Control of Induction Motor using V/F Technique Drives using PLC for Various Applications

This paper presents the need of Speed Control in Induction Motors. Out of the various methods of controlling Induction motors, V/f Control has proven to be the most versatile. The overall scheme of implementing V/f control has been presented. One of the basic requirements of this scheme is the PWM Inverter. In this, PWM Inverters have been modelled and their outputs fed to the Induction Motor drives. The uncontrolled transient and steady state response of the Induction Motor has been obtained and analyzed. The speed of the motor is controlled by varying the frequency through triggering the VFD i.e. PWM technique. Thus it causes the output voltage of the VFD according to its turn on time. The inverter converts DC power to AC power at the required frequency and amplitude. By this the variable frequency is set by VFD and the motor speed can be changed to the required speed. The entire control system is switched by using PLC. Thus the main Aim of this paper is the monitoring, speed control of motor based on VFD and programmable logic controller, and SCADA system is developed which shows the parameters of IM on the GUI Application Software.