Abstract
MODELING OF DC MOTOR PWM CONTROL DRIVE FOR ADJUSTABLE SPEED APPLICATIONS
Ekpenyong N. Oku, Emmanuel E. Effiong*, Okon Ekpenyong and Prince N. Bernard
ABSTRACT
This paper adopts Pulse Width modulation technique for speed control of permanent magnet direct current (DC) motor. Separately excited DC motor model is modeled using armature control scheme, and the Dc-Dc Buck converter is designed to control the speed of the motor and the model is implemented in MATLAB/SIMULINK software. This work aim is to investigate the dynamic performance of a separately excited DC motor fed by Chopper for its efficient Speed control. The speed of the motor is feedback and is compared with the reference speed, PID controller is used to evaluate the error, and the Pulse Width Generator block then converts this signal into trains of pulses which trigger the Chopper (IGBT) of buck converter. The Chopper Switching duration determine output voltage of the Buck converter, which also supply voltage to armature winding of the motor, Since motor speed depends on the armature voltage in armature control scheme,. The variable speed operation is implemented and speed of the motor is successfully regulated. The performance of the PWM control method is evaluated using variable load condition, Reference speed tracking is tested with the help of PID controller and transient response to reference speed is evaluated. From the simulation results show that PWM control method provides excellent and efficient control the DC motor and is recommended for Industrial application where variable speed operation is utilized.
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