PC-Based Motor Speed Control

Sun, Joe Him (2009) PC-Based Motor Speed Control. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Electric motors have been widely used in all sorts of application since the industrial revolution. The rotation and direction speed motors varies according to its application. Conventional method requires physical adjustment of the variable resistors to control the speed of the motor. However, such approach leads to high power losses and causes inefficiency within the designed system. Although a PWM controlled system is normally used to overcome the drawback of the conventional method, but the duty cycle of the generated signal and the exact rotation speed of the motor could not be monitored and controlled. As a result, the reliability, efficiency and accuracy of the PWM signal technique is still unpredictable. This particular project is to develop a PC-based monitoring and controlling for DC and AC motor speed control system. The developed system controls the PWM signal through the use of NI LabVIEW software and NI DAQ device (USB-6221) to monitor digitally and control the duty cycle as well as display the exact speed of the rotating motor. The PID controller will be implemented in a closed-loop form to eliminate the disturbance occur in current project. The accuracy and efficiency of the system can now be made relatively high. LabVIEW enables an intuitive graphical programming development environment for engineers to acquire, analyze and present real-world data. Real-world data can easily be obtained by interfacing the DAQ device with the LabVIEW software which suits various application purposes.

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