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Comparison of Quasi Bang-Bang and Sliding Mode Controls for a DC Shunt Motor with Time Delay

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Abstract

We propose a hybrid fuzzy-linear controller for a nonlinearterminal voltage-controlled DC motor. The nonlinearity includes theeffect of magnetization saturation and a nonlinear fan load. The inputto the proposed Fuzzy Logic Controller (FLC) is an 'aggregate' errorbetween the required and the actual rpm and its time derivatives. TheFLC is designed to approximate a bang-bang controller and itscoefficients are chosen as a tradeoff between short rise time, smallsteady-state errors, and control chattering. The FLC performance wascompared to that of a well-known design; namely a sliding modecontroller with a boundary layer. Although the FLC design procedure iseasier, the performance of the two controllers are quite similar.Unfortunately, the FLC design was not robust enough to counter theeffect of large time delays introduced by the power electronicsinterface.

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Authors and Affiliations

  1. NASA Autonomous Control Engineering Center, Department of Electrical Engineering, North Carolina A&T State University, Greensboro, NC, 27411, U.S.A.

    M. Bikdash, V. Kunchithapadam, K. Ragunathan & A. Homaifar

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  1. M. Bikdash
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  2. V. Kunchithapadam
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  3. K. Ragunathan
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  4. A. Homaifar
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Bikdash, M., Kunchithapadam, V., Ragunathan, K. et al. Comparison of Quasi Bang-Bang and Sliding Mode Controls for a DC Shunt Motor with Time Delay. Nonlinear Dynamics 23, 87–102 (2000). https://doi.org/10.1023/A:1008333819832

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