An Optimal Proportional Plus Integral Set Point Controller for a Permanent Magnet DC Motor

Michael Fisher, A. Ghosh, A.M. Sharaf

Research output: Contribution to journalArticle

Abstract

The aim of this paper is to design a controller for a permanent magnet de (pmdc) motor with a nonlinear load. The speed of the motor is required to vary from one set point to another. The control structure consists of a proportional type controller for inner current limiting and a proportional plus integral type controller used for outer speed regulation.Two cases are considered. The first is when the motor has a pre-specified duty cycle and in this case variable gains are calculated off-line as the solution of a constrained optimal parameter selection problem. The second case is when the required operating speeds are not pre-specified and can be changed on-line. Then, simple approximating functions are used to provide on-line estimates of these gains. A design which uses fixed gains throughout the duty cycle is also discussed. The two controller designs are tested and compared through digital computer simulation studies.
Original languageEnglish
Pages (from-to)1431-1444
JournalControl Theory and Advanced Technology
Volume10
Issue number4
Publication statusPublished - 1995

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