BRUSHLESS HIGH-FREQUENCY ALTERNATOR AND EXCITATION METHOD FOR THREE-PHASE AC POWER-FREQUENCY GENERATION

摘要

A method is disclosed for arranging and exciting the stator, rotor and va rious windings of a multi-stage brushless high frequency alternator so that the resulting multiple high frequency sub-phase armature winding outputs can be rectified and commutated into three phase power frequency alternating cu rrent (AC) electrical output. Power frequency currents in field windings con trol output amplitude, output frequency, and output phase. Devices incorpora ting this arrangement are suitable of generating fixed frequency electrical power while accommodating variable speed rotation of a generator shaft and o ffer multiple advantages over existing techniques. The capability to generat e speed independent electric power allows natural power sources such as wind mills and hydro-power stations to be efficiently coupled to fixed frequency power grids.