Design procedures for small synchronous generators with interior permanent magnet rotors

Abstract

This paper presents the design and analysis of a three phase synchronous generator with an interior permanent magnet rotor (NdFeB). The main point of such a rotor construction is the design of the flux barriers because of its direct connection with the saliency of the machine. The performance analysis is derived from the results of a transient 2D-finite-element method with a direct coupled electrical circuit. Furthermore an optimized rotor design results in an elementary reduction of the supplementary losses caused by the higher harmonics.