Journal of Zhejiang University-SCIENCE A

, Volume 10, Issue 3, pp 345–352 | Cite as

Flat-type permanent magnet linear alternator: A suitable device for a free piston linear alternator

  • Qing-feng LiEmail author
  • Jin Xiao
  • Zhen Huang


We proposed the flat-type permanent magnet linear alternator (LA) for free piston linear alternators (FPLAs) instead of the tubular one. Using the finite element method (FEM), we compare these two kinds of LAs. The FEM result shows that the flat-type permanent magnet LA has higher efficiency and larger output specific power than the tubular one, therefore more suitable for FPLAs, and that the alternator design can be optimized with respect to the permanent magnet length as well as the air gap.

Key words

Free piston (FP) Linear alternator (LA) Internal combustion engine (ICE) Finite element method (FEM) 

CLC number



Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Arshad, W.M., Sadarangani, C., Bäckström, T., Thelin, P., 2002. Finding an Appropriate Electrical Machine for a Free Piston Generator. The 19th Electrical Vehicle Symposium (EVS), Busan, Korea, p.427–437.Google Scholar
  2. Arshad, W.M., Thelin, P., Bäckström, T., Sadarangani, C., 2003. Alternative Electrical Machine Solutions for a Free Piston Generator. Proceedings of the 6th International Power Engineering Conference (IPEC2003), Singapore, p.329–334.Google Scholar
  3. Atkinson, C.M., Petreanu, S., Clark, N.N., Atkinson, R.J., McDaniel, T.I., Nandkumar, S., Famouri, P., 1999. Numerical Simulation of a Two Stroke Linear Engine-alternator Combination. SAE Technical Paper Series, No. 1999-01-0921, p.1–15.Google Scholar
  4. Boldea, I., Nasar, S.A., 1987. Permanent-magnet linear alternators—Part II: design guidelines. IEEE Transactions on Aerospace and Electronic Systems, 23(1):79–82. [doi:10.1109/TAES.1987.313338]CrossRefGoogle Scholar
  5. Boldea, I., Nasar, S.A., 1999. Linear electric actuators and generators. IEEE Transactions on Energy Conversion, 14(3):712–717. [doi:10.1109/60.790940]CrossRefGoogle Scholar
  6. Cawthorne, W., Famouri, P., Clark, N., 2001. Integrated Design of Linear Alternator/Engine System for HEV Auxiliary Power Unit. IEEE International Conference on Electric Machines and Drives (IEMDC), p.267–274. [doi:10.1109/IEMDC.2001.939310]Google Scholar
  7. Cosic, A., Lindback, J., Arshad, W.M., Leksell, M., Thelin, P., Nordlund, E., 2003. Application of a Free-Piston Generator in a Series Hybrid Vehicle. The 4th International Symposium on Linear Drives for Industry Applications, LDIA, p.541–544.Google Scholar
  8. Goldsborough, S., van Blarigan, P., 1999. A Numerical Study of a Free Piston IC Engine Operating on Homogenous Charge Compression Ignition Combustion. SAE Technical Papers Series, No. 1999-01-0619, p.1–14.Google Scholar
  9. Hansson, J., Leksell, M., Carlsson, F., 2005. Minimizing Power Pulsations in a Free Piston Energy Converter. IEEE 11th European Conference on Power Electronics and Applications, Dresden, Germany.Google Scholar
  10. Li, Q.F., Xiao, J., Huang, Z., 2008. Simulation of a two-stroke free-piston engine for electrical power generation. Energy & Fuels, 22(5):3443–3449. [doi:10.1021/ef800217k]CrossRefGoogle Scholar
  11. Ma, L.P., Xia, B.J., 2003. State of art of R&D of power Ni-MH battery for hybrid electric vehicle. Chinese Journal of Power Sources, 27:245–249 (in Chinese).Google Scholar
  12. Shoukry, E.F., Taylor, S., Clark, N., Famouri, P., 2002. Numerical Simulation for Parametric Study of a Two-stroke Direct Injection Linear Engine. SAE Technical Papers Series, No. 2002-01-1739.Google Scholar
  13. van Blarigan, P., 2002. Advanced Internal Combustion Electrical Generator. Proceeding 2002 U.S. DOE Hydrogen Program Review, NREL/CP-610-32405, p.1–16.Google Scholar
  14. Wang, J., West, M., Howe, D., La Parra, H.Z.-D., Arshad, W.M., 2007. Design and experimental verification of a linear permanent magnet generator for a free-piston energy converter. IEEE Transactions on Energy Conversion, 22(2):299–305. [doi:10.1109/TEC.2006.875434]CrossRefGoogle Scholar
  15. Yang, B., Wen, J.B., Yang, G., Li, Q.X., 2006. Finite element analysis for the magnetic field and force of the linear permanent reciprocating generators. Explosion-Proof Electric Machine, 41(3):28–31 (in Chinese).Google Scholar

Copyright information

© Zhejiang University and Springer-Verlag GmbH 2009

Authors and Affiliations

  1. 1.MOE Key Laboratory for Power Machinery and EngineeringShanghai Jiao Tong UniversityShanghaiChina

Personalised recommendations