DESIGN AND DEVELOPMENT OF SPEED CONTROL FOR 3 – PHASE INDUCTION MOTOR USING AT89C52 MICROCONTROLLER
Publication Date : 15/03/2018
The reliability, robustness, ruggedness and simple control of induction motors propels their use widely in both industrial and commercial applications. Speed control is of paramount importance as a result of the growing need of industrial drives. The aim of this work is to design and develop speed control for 3-phase induction motor using AT89C52 microcontroller. To actualize the aim, the AT89C52 microcontroller was used to generate PWM signal for switching of the MOSFETs which makes up the power inverter. The power inverter converts DC power generated by the controller to an AC power which was delivered to the induction motor for driving. MOSFETs were used to control the AC voltage that drives the motor. The push button switches attached to the microcontroller were used for either increasing or decreasing the AC power delivered to the motor. The variation of the AC power to the motor resulted in speed variations. LCD display was used to display the speed variations. Experimental results show that the speed of the motor has a linear relationship with the armature terminal voltage as well as the input power to the motor and result also show that the motor torque decreases as the speed increases.
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