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The performance of switched reluctance machines (SRM) is strongly structure‐dependent. The layout of the power feeding circuitry of the machine depends, in turn, upon the structure of the motor. This paper discusses the problems of the machine structure: number of phases, number of poles per phase, number of teeth on the rotor and on the stator, etc. Several power circuitries are examined and the advantages and drawbacks of each of them are discussed. Four‐quadrant drive, dynamic and regenerative braking mode of functioning are reviewed.

The paper deals with the definition of a criterion for comparing the intrinsic electromagnetic performance of electrical machines and demonstrates its fairness and consistency. Conclusions obtained by comparing the intrinsic electromagnetic performance of different types of electrical machines versus switched reluctance machines (SRM) are given at the end of the paper.

This paper will show that a simple formulation, similar to that used for the evaluation of the copper loss, can be used to calculate the iron loss of an electrical machine. The analytical method used in the present contribution for evaluating the iron loss of almost all types of electrical machines remains valid for any periodic, quarter‐wave symmetry‐applied voltage waveform. Accurate direct measurements of iron loss concerning five types of industrial electrical machines are presented and analyzed. These data concern two field‐excited and one permanent magnet‐excited DC commutator motors, a high‐speed, 400 Hz, induction motor used in the aeronautical industry and a permanent magnet (PM) synchronous motor used in robotics. These measurements come to support the validity of the proposed formulation and to check each specific aspect of the presented analysis.

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