IMPLEMENTATION OF VARIABLE FREQUENCY DRIVE (VFD) FOR SHIPBOARD APPLICATION

摘要

A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electromechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. BLDC motor is used in many wide range applications. In Brush less DC motor several cases are used in those techniques they are inverter and PWM inverter technique. The brushless dc motor used the variable frequency drive for shipboards application. This paper describes a simpler way to control the speed of PMBLDC motor using pwm control method. It is suitable for both sensor and sensor less methods of PM BLDC motor control. Although using the sensor less mode has big advantages in terms of cost and size, it makes the motor drive a little more complicated. These all above conditions are verified by simulation by using MATLAB/Simulink software.