The optimal stator design of novel three-phase doubly salient permanent magnet generator for improving the generator output

Author(s): V. Lounthavonga, W. Sriwannarata, C. Surawanitkunb, R. Chatthaworna, A.
Siritaratiwata and P. Khunkittia
aDepartment of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand
bFaculty of Applied Science and Engineering, Khon Kaen University, Nong Khai Campus, Nong Khai 43000, Thailand
International Journal of Smart Grid and Clean Energy, vol. 9, no. 2, March 2020: pp. 314-322
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.9.2.314-322

Abstract: As widely indicated in many recent studies that the Doubly Salient Permanent Magnet (DSPM) generator could provide high electromotive force (EMF), this paper proposes an optimal structure design of DSPM generator for improving the generator output. The finite element method was 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 generator were demonstrated. The generator outputs including the magnetic fluxlinkage, magnetic flux distribution, EMF and voltage regulation were discussed. The results showed that the magnetic flux-linkage and the EMF of proposed optimal structure could be significantly improved by an adjustment of the PM thickness and stator depth. An optimal thickness of PM and inner stator depth regarding this particular generator was chosen. The magnetic flux distribution analysis was also carried out to confirm the simulation results. It was found that the optimal structure of DSPM can be achieved by increasing the PM thickness to be 150 % with reducing the stator pole depth to be 80 % of the those conventional values. The flux-linkage and EMF produced by the proposed optimal structure are 15.88 % and 6 % higher than that of conventional structure. Moreover, the optimal structure also provides greater voltage regulation profile than conventional structure. Then, the optimal design of PM thickness and inner stator depth regarding this particular generator model can be adapted any other PM machine design in order to maximize the generator output.

Keywords: Permanent magnet machine, Doubly salient generator, Finite element methods, Electromagnetic force, voltage regulation
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