Generated Voltage Harmonics Minimization of Radial Permanent Magnet Single-Phase AC Linear Generator

Two-dimensional finite element method is used in the analysis to calculate the magnetic field parameters in a radial permanent magnet linear single-phase AC generator. Both surface and internal permanent magnet schemes are analyzed and compared according to three different parameters; the cogging force, the induced AC voltage and the THD of the induced AC voltage. Three different design structures were used to reduce the THD of the induced voltage; tooth shoe, stepped tooth and chamfered tooth. The chamfered tooth provides as low THD as 4% and 12% for surface and internal prototype schemes, respectively. The cogging force was much reduced using the stator optimal length; for both schemes, in addition to the total generator weight is reduced.