27-02-2012, 04:18 PM
Dc Motor Speed Controller Using PWM Technique
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INTRODUCTION
DC Motor is a Machine which converts Electrical energy into Mechanical energy.
It takes Electrical energy as input and produces Mechanical rotations of the MOTOR shaft.
DC Motors are widely used in many industrial applications and in day to day life.
Power Supply-
It provides required power to microcontroller, dc motor and all other components.
It consists of :
Transformer-It steps down the AC mains 230V, 50A
to 9V,750mA.
Bridge Rectifier- It is a combination of four diodes,
connected in such a way so as to produce pulsated DC
signal at its output.
Filter- It removes all the ripples present and produces pure dc output.
Regulator- It produces 5V from 9V which is given to the microcontroller.
ADVANTAGES
There various advantages are:
PWM technique enables greater efficiency of DC Motor.
PWM technique improves speed control and reduces power loss.
Internal Motor resistance can be easily overcome.
The pulses reach full supply voltage which in turn produces more Torque.
DISADVANTAGES
Increased Complexity.
Speed obtained is less than the specified speed due to losses.
Speed remains limited.
