The DC Inverter units have a variable frequency drive that comprises an adjustable electrical inverter to control the speed of the electromotor, [1]. It then uses a modulation technique called Pulse Width Modulation to produce AC current based on the desired frequency and voltage. The variable frequency AC drives the brushless motor / induction motor or dc motor. This allows users to have the liberty of reduced costs and less energy consumptions. Variable frequency drive finds its application in number of electrical equipment from small scale motors to high level turbines and compressors. According to a report[7] nearly 25% of the total world energy is consumed by electric motors and similar appliances in industrial applications  .Having such a large percentage of usage we can save the energy by applying VFD to those equipment not only making them efficient and cost effective  but also save energy. By the suitable usage of these drives we can contribute in saving power and energy resources.