6533b856fe1ef96bd12b250a

RESEARCH PRODUCT

Control of the speed of a DC motor by employeeing pulse width modulation (PWM) technique

Fahad FaisalFarruk AhmedMunawwar M. SohulMohammad Tafiqur Rahman

subject

PhysicsPulse-frequency modulationbusiness.industryDuty cyclePush switchAmplifierElectrical engineeringPotentiometerOscilloscopebusinessDC motorPulse-width modulation

description

This paper is mainly focused on the technique of pulse width modulation for controlling the speed of a 12 volt DC motor more efficiently. A potentiometer was used to generate a wide variety of pulses. The output of the controlling circuit (Pulse Width) was connected to the second circuit as input for direction control. Here a single push switch was used to change the state (stopforward-stop-reverse) of the DC motor. These two circuits were combined into one for ease of use. Third circuit was designed to measure the speed of the motor by employing an opto-electronic sensor, an amplifier and a two blade fan to interrupt the signal transmission of the sensor. Finally, the output of the sensor was connected with an oscilloscope through an amplifier and a train of square was found. By measuring the time period of the square waves, the duty cycle and Rotation per Minute (RPM) was calculated. After calculating the result from the observation proves that pulse width modulation is an efficient technique for controlling DC motor rather than other conventional technique.

yearjournalcountryeditionlanguage
2009-12-012009 12th International Conference on Computers and Information Technology
https://doi.org/10.1109/iccit.2009.5407118