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Optimised Design and Analysis of a New Linear Switched Reluctance Actuator

Calado, M.R.A. ; Mariano, S.J.P.S. ; Cabrita, C. M. P.

International Review of Electrical Engineering Vol. 5, Nº 3, pp. 919 - 926, June, 2010.

ISSN (print): 1827-6660
ISSN (online): 1827-6660

Journal Impact Factor: 1,364 (in 2010)

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Abstract
This paper proposes a procedure for the design of a new single-sided linear switched reluctance actuator (LSRA). First, an analytical analysis is established, using a proposed calculus sequence, to obtain electrical and mechanical parameters. After, a numerical analysis is developed, based on finite element method, to determine the effect of geometry changing, or the influence of excitation positions and current levels, in machine performance, prior to construction of a prototype. These two methods are then connected in order to proper change dimensional and performance parameters, allowing an optimised design of the machine. The theoretical traction forces, obtained as a result of the equivalent magnetic circuit co-energy variation analysis, for different relative positions between the primary and secondary parts of the machine, as well as for several excitation levels, are presented and compared with experimental results carried out by the authors, by using a prototype with 2 mm airgap. The actuator characterization allows the knowledge of proper coil excitation positions and current magnitude, for different practical applications. The LSRA experimental tests are presented, establishing thermal, electrical and mechanical limitations. The experimental stationary analysis, together with the previous analytical and numerical analysis, will be the starting point to the machine control strategies establishment.