DocumentCode :
1411565
Title :
Analytical Modeling and Design Optimization of Linear Synchronous Motor With Stair-Step-Shaped Magnetic Poles for Electromagnetic Launch Applications
Author :
Tavana, Nariman Roshandel ; Shoulaie, Abbas ; Dinavahi, Venkata
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada
Volume :
40
Issue :
2
fYear :
2012
Firstpage :
519
Lastpage :
527
Abstract :
In this paper, a stair-step-shaped magnetic pole structure is proposed to use in a permanent-magnet linear synchronous motor (PMLSM) for its application in an electromagnetic launch system. The aim of this configuration is to shape the air-gap flux density distribution produced by poles to be as close to a sine waveform as possible for the reduction of thrust ripple and the increase of motor controllability. An analytical model is derived for the PMLSMs by solving Maxwell equations and applying the superposition theorem for calculating the magnetic field, electromotive force, and thrust/torque of the motor. Magnet dimensions are then optimized using the analytical method and genetic algorithm, where the reduction of air-gap flux density harmonics is considered as the optimization target. Finally, the effectiveness of the proposed technique to enhance the motor performance is investigated by a time-stepping transient finite-element method. The results show an improvement in the optimal motor performance.
Keywords :
Maxwell equations; electromagnetic launchers; finite element analysis; genetic algorithms; linear synchronous motors; permanent magnet motors; torque; Maxwell equations; air-gap flux density distribution; design optimization; electromagnetic launch; electromotive force; genetic algorithm; magnetic field; motor controllability; permanent-magnet linear synchronous motor; stair-step-shaped magnetic poles; thrust-torque; time-stepping transient finite-element method; Air gaps; Analytical models; Finite element methods; Force; Magnetic flux; Synchronous motors; Windings; Analytical modeling; finite-element methods (FEMs); permanent-magnet linear synchronous motor (PMLSM); stair-step-shaped magnetic pole $(hbox{S}^{3}hbox{MP})$;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2011.2178616
Filename :
6118331
Link To Document :
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