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Mathematical Problems in Engineering
Volume 2014, Article ID 787382, 15 pages
Research Article

Improvement of Energy Density in Single Stator Interior Permanent Magnet Using Double Stator Topology

1Department of Electrical and Electronics, Faculty of Engineering, Universiti Putra Malaysia, Malaysia
2Faculty of Electrical Engineering, Universiti Teknikal Malaysia, Melaka, Malaysia
3Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
4CIARG, School of Engineering, Taylor’s University, 47500 Selangor, Malaysia
5Nagano National College of Technology, 716 Tokuma, Nagano 381-8550, Japan
6Shinshu University, 500 Wakasato, Nagano 380-8553, Japan

Received 18 October 2013; Revised 15 March 2014; Accepted 21 March 2014; Published 23 April 2014

Academic Editor: Sergio Preidikman

Copyright © 2014 Raja Nor Firdaus et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper presents the energy density improvement using magnetic circuit analysis of the interior permanent magnet motor. The leakage flux from the conventional structure is improved with modified magnetic circuit to improve the energy and thereby the torque value. This is approached with a double stator structure design. The proposed structure is investigated with two design variations, namely, the double stator with thin pole shoe and the double stator with thick pole shoe motors. Variations in the mechanical parameters of the all the developed models are analyzed through the finite element analysis tool. In all investigations the magnetic source is fixed in both the permanent magnet volume and coil magnetomotive force, respectively, as 400 mm3 per each pole and 480 Ampere turns per pole. From the analysis the best fit magnetic structure based on the torque characteristics is derived and is fabricated for the same volume as that of the conventional structure for performance evaluations. It is found out that there is improvement on the motor constant square density for the proposed improved magnetic circuit through the best fit double stator with thick pole shoe by about 83.66% greater than that of the conventional structure.