BRUSHLESS CONSTANT-FREQUENCY GENERATION USING SINGLE-FRAME CASCADED INDUCTION MACHINES

ABSTRACT

Brushless variable-speed constant-frequency generation finds its place in numerous situations such as aerospace and wind energy applications. In the past, cascade connected induction machines have been considered for aircraft applications due to their reliability compared to existing generating systems. The Single-Frame Cascaded Induction Machine (SFCIM) in variable-speed constant-frequency generating applications is a more favourable solution compared to a two machine system. This paper presents the application of a novel steady-state model of SFCIM to analyse a brushless, variable-speed constant-frequency generating scheme proposed for aircraft applications. The SFCIM considered in this paper consists of two independent stator windings and a rotor with a ‘multicircuit single-layer bar winding’ which is simple and robust. The theoretical results obtained using the new model are compared with the experimental results.