Contribution to iron‐loss evaluation in electrical machines

Abstract

Abstract 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.