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Permanent Magnet Linear Alternator Magnetic Field Analysis

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2011 ASEE Annual Conference & Exposition


Vancouver, BC

Publication Date

June 26, 2011

Start Date

June 26, 2011

End Date

June 29, 2011



Conference Session

Electromechanical Capstone and Design Projects in Engineering Technology

Tagged Division

Engineering Technology

Page Count


Page Numbers

22.1153.1 - 22.1153.10



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Paper Authors


Chong Chen Middle Tennessee State University

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Dr. Chong Chen is a professor in the Department of Engineering Technology at Middle Tennessee State University. He received B.S. degree from Hebei Institute of Technology in China, M.S. degree from Tianjin University in China, and Ph.D. degree from University of Kentucky, all in Electrical Engineering. Dr. Chen teaches electric circuits, electronics, controls, and industrial electricity. His research areas include controls, power electronics, electric machines, and electromagnetic fields. Dr. Chen is a Professional Engineer registered in the State of Tennessee.

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Permanent Magnet Linear Alternator Magnetic Field Analysis Permanent magnet linear generators are energy converting devices that have been underresearch and development for years. This type of generators have advantages of highefficiency and no need of liner motion to rotation converting, when the driving force is inlinear oscillation. Such applications can be found when ocean tide, solar power, andswing motions are used for generating electric power. Magnetic field analysis is essential for electric machine designs. The results from theanalysis show the magnetic field distributions in a machine. It may help the designer tomodify the design for getting a better product. Magnet field analysis may also be used forfinding torque, force, power losses, and induced voltage. They are the primary parametersof electrical machine performance study. This paper presents the magnet field analysis of a cylindrical permanent magnet lineargenerator. This generator has four permanent magnetic rings mounted on a shaft, whichoscillates linearly when the machine is working. The magnetic polarities (N or S pole) ofthe rings are in radial direction and the polarities alternate from one ring to the next. Twoof the magnet rings are on each end of the shaft and a magnetic loop is formed by thepermanent magnetic rings, shaft, and stator core. The stator core is a steel structuresurrounding the shaft, magnetic rings, and the stator winding. When the shaft is at oneend of its oscillation, the cylindrical stator pole at one side faces to an N pole magneticring and other stator pole at the other side faces an S pole magnetic ring. When the shaftmoves to the other end of oscillation, the magnetic polarities face to the stator poles areswitched. Therefore, the magnetic flux in the loop changes its value and direction forevery cycle of the shaft oscillation. The stator winding, which is a cylindrical coil aroundthe shaft and inside of the stator core, experiences the flux changes and generates ACpower. The magnetic filed study was done with Ansoft software, which is a product of ANSYSCompany. The magnetic filed distributions for different positions of the shaft andmagnetic rings were calculated. The calculated results are presented and the generator’sstructure improvements are discussed in this paper.

Chen, C. (2011, June), Permanent Magnet Linear Alternator Magnetic Field Analysis Paper presented at 2011 ASEE Annual Conference & Exposition, Vancouver, BC. 10.18260/1-2--18650

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