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Parameter Identification and Error Analysis of Approximation method for Linear motors  

Nam, Jae-Wu (Dept. of Electrical and Computer Engineering, University of Seoul)
Oh, Joon-Tae (Dept. of Electrical and Computer Engineering, University of Seoul)
Kim, Gyu-Sik (Dept. of Electrical and Computer Engineering, University of Seoul)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.49, no.4, 2012 , pp. 61-68 More about this Journal
Abstract
In this paper, a closed-loop sensorless stroke control system for a linear compressor has been designed. In order to estimate the piston position accurately, motor parameters are identified as a function of the piston position and the motor current. These parameters are stored in ROM table and used later for the accurate estimation of piston position. The identified motor parameters are approximated to the several surface functions in order to decrease memory size. They can also be divided into 2 or 4 subsections to decrease identification errors. The effect of the order of surface functions and division of subsections on identification errors and computation time is analyzed.
Keywords
linear compressor; parameter identification; surface function; subsection; memory size;
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