VARIABLE FREQUENCY DRIVE AND ITS INDUSTRIAL APPLICATIONS

Electrical Engineering

The paper presents the working principle of VFD, its performance and the use of Pulse Width Modulation (PWM) in the three phase inverter to control or maintain the ratio of voltage to frequency. Also discusses speed control of AC motor using Variable Frequency Drive (VFD). The speed of AC motors remains constant because it takes rated power from supply and therefore it causes problems when less motor speed is needed. The VFD mechanism provides an approach for variation in speed of AC motors. Motor control device that protects and controls the speed of an AC induction motor. Aspects of motor design and application will be reviewed, including typical construction, torque production. Understanding the effects of variable frequency on the motor's characteristics will help in the selection process of a motor and control unit matched to the application. The common applications of VFDs are in air handler, chiller, pumps and tower fans. A better understanding of Variable Frequency Drives with leads to improve in application and selection of both equipment.

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