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The majority of existing models for estimation and control of switched reluctance machines (SRMs) ignore the dynamic effects of mutual coupling between different phases. Although this may be acceptable for some common industrial applications, such a simplification may degrade significantly the performance of the drive and the precision of the estimated quantities. In this work an enhanced representation of the SRM is introduced, by defining an appropriate finite element model of the machine. This model enables accurate estimation of rotor position and electromagnetic torque, for any current configuration. The necessity as well as the feasibility of this approach is illustrated in the case of a three-phase, 6/4 SRM. Torque and position estimation accuracy provided by the proposed methodology is validated by measurements on a prototype three-phase 6/4 SRM. [ABSTRACT FROM AUTHOR]

This paper presents a methodology for a convenient modification of induction motor equivalent circuit parameters, taking into consideration switching frequency Iron losses in case of inverter supply. The method is based on the determination of harmonic iron losses in laminated, iron cores under nonsinusoidal excitation by using a particular three-dimensional (3-D) finite-element model adopting a reduced scalar potential formulation. Eddy currents in iron laminations are considered by means of convenient surface current densities. Experimental verification is performed in case of a 20-kW experimental setup. [ABSTRACT FROM AUTHOR]