Optimal Stator Design to Improve the Output Voltage of the Novel Three-Phase Doubly Salient Permanent Magnet Generator

Abstract

Since in many studies it has been widely indicated that the doubly salient permanent magnet (DSPM) generator could provide a high electromotive force (EMF), this paper proposes an optimal structural design of the DSPM generator for improving the output profile of the generator. The finite element method has been performed in the simulations and analysis. The effects of stator structural parameters, including the thickness of permanent magnet (PM) and the inner stator depth, on the output characteristics of the generator have been investigated. The generator outputs including the magnetic flux-linkage, the magnetic field distribution, the EMF, and the voltage regulation have been analyzed and discussed. The results have showed that the magnetic flux-linkage and the EMF of the proposed optimal structure could be significantly improved by an optimum modification of the PM thickness and the stator depth. Then, the optimal thickness of PM and inner stator depth of this particular generator has been proposedly selected. The flux-linkage and the EMF produced by the optimal structure have been 15.88 % and 6 % improved than the one of the conventional structure. The magnetic field distribution analysis has been also carried out in order to confirm the symmetrical property of simulation results. Furthermore, the optimal structure has also provided a greater voltage regulation profile than the conventional structure. This design technique can be also utilized to improve the generator output profile of other DSPM machines.