Investigations on parameter Estimation and controller design For BLDC drive fed position Control system

Abstract

Position control is widely employed in process control and industrial newlineautomation applications Precise accurate fast and non oscillatory position newlinecontrol is required in such applications to achieve optimum results To newlineachieve this it is essential for the control to be effective for parameter and newlineload variations Hence it is required to identify and estimate the parameters newlinethat undergo variations under different operating conditions Further a newlinesimple reliable and suitable control strategy has to be employed for obtaining newlinethe desired results The main objective of the thesis is to estimate the newlinemechanical parameters of a motor drive system with respect to load and newlinedesign a simple first order compensator based on the estimated parameters to newlineachieve optimum position control that is independent of load variation newlineBrushless Direct Current BLDC motors are preferred in such newlineapplications due to their advantages such as high torque per weight high newlinetorque per watt increased reliability reduced noise electronic and spark free newlinecommutation overall reduction of electromagnetic interference EMI and newlinelonger lifetime There are a number of techniques in the literature to estimate newlinethe mechanical parameters viz moment of inertia and friction coefficient of a newlineBLDC drive system that undergo variations under different operating newlineconditions newline newline