Fixed-point DSP implementation of nonlinear controller for large gap electromagnetic suspension system |
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Authors: | Paulo H. da Rocha Henrique C. Ferreira Michael C. Porsch Roberto M. Sales |
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Affiliation: | aBrazilian Navy Technology Center, Electro-Electronic Project Division, Av. Prof. Lineu Prestes, n. 2468, CEP 05508-000, São Paulo (SP), Brazil;bUniversity of São Paulo, Department of Telecommunication and Control Engineering, Av. Prof. Luciano Gualberto, trv. 3, n. 158, CEP 05508-900, São Paulo (SP), Brazil |
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Abstract: | Electromagnetic suspension systems are inherently nonlinear and often face hardware limitation when digitally controlled. The main contributions of this paper are: the design of a nonlinear H∞ controller, including dynamic weighting functions, applied to a large gap electromagnetic suspension system and the presentation of a procedure to implement this controller on a fixed-point DSP, through a methodology able to translate a floating-point algorithm into a fixed-point algorithm by using l∞ norm minimization due to conversion error. Experimental results are also presented, in which the performance of the nonlinear controller is evaluated specifically in the initial suspension phase. |
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Keywords: | Magnetically insulated gaps Nonlinear control H-infinity control Digital signal processors Signal processing Implementation |
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