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Modeling and Experimental Characterization of a Permanent Magnet Linear Alternator for Free-Piston Engine Applications

[+] Author Affiliations
Hans T. Aichlmayr

Lawrence Livermore National Laboratory, Lawrence, CA

Peter Van Blarigan

Sandia National Laboratories, Lawrence, CA

Paper No. ES2009-90396, pp. 761-770; 10 pages
doi:10.1115/ES2009-90396
From:
  • ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences
  • ASME 2009 3rd International Conference on Energy Sustainability, Volume 1
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Advanced Energy Systems Division and Solar Energy Division
  • ISBN: 978-0-7918-4889-0 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME

abstract

Sandia National Laboratories is developing a prototype 30kW free-piston internal-combustion-based linear generator for vehicular applications. This paper describes the development and experimental validation of a mathematical model for the permanent magnet linear alternator that will be used by the prototype. A magnetic-flux versus mover-position function is used to correlate individual coil fluxes to the motion of the mover. This function is derived from a finite element electromagnetic simulation of the linear alternator. The mathematical model of the alternator is compared to experiments with prototype hardware driving 0.5–2kW loads; excellent correspondence to measured voltage and current waveforms is found.

Copyright © 2009 by ASME

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