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This paper investigates the design of low speed Switched Reluctance Generators (SRG) based on a different paradigm. The proposed design procedure utilises the formulation of similarity laws and scale models to compare SRG magnetic structures. Besides evaluating regular and similar topologies the scale models are here applied in dimensional analysis of topologies distinguished by different characteristics of electric and magnetic circuits. Furthermore, the scale models methodology can cover physical phenomena like thermal changes and magnetic saturation by introducing some constraints. This work is motivated by the application of SRG to direct drive wind converters and other low speed renewable energy systems. The paper contains the illustration of dimensional analyses on a modular topology with short flux-paths designed for a direct drive wind turbine. Comparing with a regular machine, the short flux-paths topology can optimize the efficiency and weight taking benefits from the significant gain of power per unit of mass and lower losses.

In this paper, an analytical approach is used to determine the Flux-linkage characteristic of regular Switched Reluctance Machines (SRMs) considering simple geometry aspects. The proposed method is derived from an 8/6 SRM magnetic characteristic obtained by experimental tests and validated by FEM results. In order to reduce calculation time and expense, regarding simulation and implementation proposes, this analytical functions approach requires only few parameters, normally available or easily measured. An application example for a 6/4 SRM is presented to illustrate its use.

This paper discusses how the magnetic characteristics of Switched Reluctance Machines (SRMs) are obtained by experimental, analytic and FEM modelling. Two analytical approaches are used to determine the Flux-linkage characteristic of Switched Reluctance Machines considering simple geometry aspects. The proposed methods are derived from a regular SRM magnetic characteristic obtained by experimental tests and validated by FEM. In order to reduce calculation time and expense, regarding simulation and implementation proposes, these analytical functions approaches require only few parameters, normally available or easily measured. The developed model of the first approach is presented and the second approach concepts are illustrated with a 6/4 SRM flux-linkage characteristic. Index Terms-Analytical functions approach, finit-element modelling, flux-linkage characteristics, switched reluctance machine.

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