Author : Muhammad Ahsan Niazi, Qaisar Hayat, Basit Khan and Muhammad Afaq

Three-phase AC induction motors play a very important role in industry due to its low price and simplicity. The induction motor is used to convert three-phase AC power into mechanical power. When the load on an induction motor increases the percentage of slip is increase, which leads to decrease the speed of induction motor while constant speed in industry is very important. This paper presents a simple converter for driving three-phase Induction motor from three-phase AC supply by using the variable frequency drive in feedback. So the speed of induction motor is controlled by variable frequency device automatically through controller. It is simple and efficient method to control the speed because speed depends upon voltage, pole and frequency. Poles are fix inbuilt in the motor so we cannot change it and speed control through VFD is simple and energy efficient method. This technique implemented on hardware. So this technique is robust and simpler to implement.

Keywords: Three-phase induction motor, VFD, Speed control

Article published in International Journal of Current Engineering and Technology, Vol.10, No.1 (Jan/Feb 2020)