Fundamental study of outer-rotor hybrid excitation flux switching generator for grid connected wind turbine applications

This paper presents an operating principle of a new proposed outer-rotor hybrid excitation flux switching generator. In this Generator a combination of a permanent magnet (PM) and field excitation coil (FEC) are used as the main flux sources. Additional FEC can be used to control the flux so that constant voltage can be produced at various wind conditions. Moreover, twelve coil test analysis, Three Phase coil test flux excited by PM only, Back-EMF at various speed and stack-length conditions, magnetic flux strengthening at various current densities and flux distributions are investigated by using JMAG software. The result shows that the generated voltage is directly proportional with the change of speed and stack-length. Also parametric optimization was conducted using deterministic optimization method (DOM) and the improved design indicated a higher output voltage.