Energy Saver Power Factor Controller For Induction Motor

Mohd Hilmy , Abdullah Zawawi (2008) Energy Saver Power Factor Controller For Induction Motor. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

The purpose of this project is to implement the energy saver power factor controller for alternating current (AC) induction motor. Energy savings for induction motor can be realized with adjustable speed operation. As the speed varies with load, the power consumption characteristic of the motor will also varies. The control of power consumption to save energy usage is done by using the Variable Frequency Drive (VFD) or its other name, Variable Speed Drive. VFD is a controller that varies the speed of an induction motors. It consists of a rectifier, intermediate direct current (DC) circuit, an inverter, and a controller. The operating speed of an induction motor which is connected to a VFD is varied by changing the frequency of the motor's supply voltage. Output frequency and voltage is controlled electronically by controlling the voltage pulse width to the motor. These techniques require switching the inverter power devices ON and OFF many times to generate proper RMS voltage level. This action allows continuous process speed control. The power factor of variable frequency drive is discussed.

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