Calculation of a Hybrid Excitation Permanent Magnet Synchronous Generator Using Magnetic Field Finite Element Analysis

An analysis of a novel structure hybrid excitation synchronous generator(HESG)was presented,which consisted of a permanent magnet part as the major component,and an electrically-excited part as the assistant component,and hence possessed the advantages of both the PM and electrically-excited generators.To accurately determine the machine parameters,three-dimensional(3D)finite element analysis was conducted to solve the magnetic field distribution in the electrically-excited part,which was quite complicated and 3D.An equivalent electrical circuit was derived to calculate the generator performance,such as the external characteristic or the relation between the output voltage and the load.A hybrid excitation PM synchronous generator prototype has been constructed and the experimental results validated the theoretical calculations.