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Open AccessArticle

Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings

1
Department of Electrical and Computer Engineering, COMSATS University Islamabad, Abbottabad Campus, University Road Abbottabad, Abbottabad 22060, Pakistan
2
Department of Electrical Engineering, University of Engineering and Technology Peshawar, Peshawar 25120, Pakistan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(8), 1576; https://doi.org/10.3390/en12081576
Received: 15 December 2018 / Revised: 9 April 2019 / Accepted: 11 April 2019 / Published: 25 April 2019
(This article belongs to the Special Issue Energy Efficiency in Electric Devices, Machines and Drives)
This paper aims to propose and compare three new structures of single-phase field excited flux switching machine for pedestal fan application. Conventional six-slot/three-pole salient rotor design has better performance in terms of torque, whilst also having a higher back-EMF and unbalanced electromagnetic forces. Due to the alignment position of the rotor pole with stator teeth, the salient rotor design could not generate torque (called dead zone torque). A new structure having sub-part rotor design has the capability to eliminate dead zone torque. Both the conventional eight-slot/four-pole sub-part rotor design and six-slot/three-pole salient rotor design have an overlapped winding arrangement between armature coil and field excitation coil that depicts high copper losses as well as results in increased size of motor. Additionally, a field excited flux switching machine with a salient structure of the rotor has high flux strength in the stator-core that has considerable impact on high iron losses. Therefore, a novel topology in terms of modular rotor of single-phase field excited flux switching machine with eight-slot/six-pole configuration is proposed, which enable non-overlap arrangement between armature coil and FEC winding that facilitates reduction in the copper losses. The proposed modular rotor design acquires reduced iron losses as well as reduced active rotor mass comparatively to conventional rotor design. It is very persuasive to analyze the range of speed for these rotors to avoid cracks and deformation, the maximum tensile strength (can be measured with principal stress in research) of the rotor analysis is conducted using JMAG. A deterministic optimization technique is implemented to enhance the electromagnetic performance of eight-slot/six-pole modular rotor design. The electromagnetic performance of the conventional sub-part rotor design, doubly salient rotor design, and proposed novel-modular rotor design is analyzed by 3D-finite element analysis (3D-FEA), including flux linkage, flux distribution, flux strength, back-EMF, cogging torque, torque characteristics, iron losses, and efficiency. View Full-Text
Keywords: flux switching machine; modular rotor; non-overlap winding; magnetic flux analysis; iron losses; copper loss; stress analysis; finite element method flux switching machine; modular rotor; non-overlap winding; magnetic flux analysis; iron losses; copper loss; stress analysis; finite element method
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MDPI and ACS Style

Ur Rahman, L.; Khan, F.; Khan, M.A.; Ahmad, N.; Khan, H.A.; Shahzad, M.; Ali, S.; Ali, H. Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings. Energies 2019, 12, 1576.

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