Design and optimization of self-excited synchronous machines with fractional slots

Abstract

This paper deals with the design of a synchronous machine using no brushes and no permanent magnets, in an efficient and economic layout. A self-excited machine is proposed. The space harmonics of the magneto-motive force are used to produce the excitation. The mathematical model is derived. The design optimization is aimed at maximizing the torque and reducing the mutual inductions between rotor windings.