Page 331 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

4 Power On: Turn on the DC power supply.

5 Adjust Potentiometer: Start with the potentiometer set to its minimum resistance position. Gradually increase
the resistance by turning the potentiometer knob. This action should increase the duty cycle of the PWM
signal, increasing the speed of the motor.
6 Observe Motor Speed: Observe the speed of the DC shunt motor as you adjust the potentiometer. You should
notice the motor speed increasing as you increase the resistance.

7 Fine-tune Speed: Continue adjusting the potentiometer until you achieve the desired speed for your application.
Take note of the potentiometer position or PWM duty cycle setting for future reference if you need to replicate
the speed.
8 Safety Precautions: Ensure proper ventilation and cooling for the components, especially the MOSFET, as it
may generate heat during operation. Avoid overloading the motor or the circuit beyond their rated capacities.
9 Testing and Calibration: Test the motor at different speeds to ensure smooth operation. Calibrate the
potentiometer or PWM controller if necessary to achieve precise speed control.
10 Shutdown: When finished, turn off the DC power supply and disconnect the circuit if no longer in use.
Result:

We studied and verified the Construct the PWM circuit for the speed control of DC shunt motors.

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CITS : E & H - Electronics Mechanic - Exercise 221