Vol. 102, Issue 3, March 2009, pp.62-70

Microcontroller Based Closed Loop PMDC Motor Position Control System

^*Subrata CHATTOPADHYAY, ^** Utpal CHAKRABORTY, ^*Arindam BHAKTA and ^*Sagarika PAL

*Department of Electrical Engineering, National Institute of Technical Teachers’ Training
and Research, Kolkata [Under MHRD, Govt. of India],

Block-FC, Sector-III, Salt Lake City, Kolkata-700 106, India

^** Department of Electrical Engineering, Acharya Jagadish Chandra Bose Polytechnic,
Govt. of W.B. Berachampa, Debalaya, 24-Parganas (North)

E-mail: subrata0507@sify.com, spal922@yahoo.co.in

Received: 10 December 2008   /Accepted: 24 March 2009   /Published: 31 March 2009

Abstract: The position control systems used in different applications need to meet the high performance, accuracy and reliability to achieve the desired output. Microcontrollers can be used as suitable means for meeting these needs. The PMDC motor is a low cost electrical device, which can be used for precise position control system. In the present paper, a DC chopper, driven by a PWM signal has been utilized for position control of a  PMDC motor. Controlling the duty cycle of the PWM signals has been implemented by microcontroller as equivalent to controlling the motor terminal voltage, which in turn adjusts directly the motor rotational movement. Experimental characteristics have been reported which revels the satisfactory performance of  PMDC motor in position control system. The system has good repeatability and the percentage deviation of position of motor is within tolerable limit.

Keywords:  PMDC motor, microcontroller, position control, DC chopper, PWM signal

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