SERAPHIM: A propulsion technology for fast trains

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The Segmented Rail Phased Induction Motor (SERAPHIM) is a compact, pulsed linear induction motor (LIM) offering a unique capability for very high speed train propulsion. It uses technology developed for the Sandia coilgun, an electromagnetic launcher designed to accelerate projectiles to several kilometers per second. Both aluminum cylinders and plates were accelerated to a kilometer per second (Mach 3) by passing through a sequence of coils which were energized at the appropriate time. Although this technology was developed for ultra-high velocity, it can be readily adapted to train propulsion for which, at sea level, the power required to overcome air ... continued below

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8 p.

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Kelly, B.; Turman, B.; Marder, B.; Rohwein, G.; Aeschliman, D. & Cowan, B. June 1, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 32 times . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The Segmented Rail Phased Induction Motor (SERAPHIM) is a compact, pulsed linear induction motor (LIM) offering a unique capability for very high speed train propulsion. It uses technology developed for the Sandia coilgun, an electromagnetic launcher designed to accelerate projectiles to several kilometers per second. Both aluminum cylinders and plates were accelerated to a kilometer per second (Mach 3) by passing through a sequence of coils which were energized at the appropriate time. Although this technology was developed for ultra-high velocity, it can be readily adapted to train propulsion for which, at sea level, the power required to overcome air resistance limits the operational speed to a more modest 300 mph. Here, the geometry is reversed. The coils are on the vehicle and the ``projectiles`` are fixed along the roadbed. SERAPHIM operates not by embedding flux in a conductor, but by excluding it. In this propulsion scheme, pairs of closely spaced coils on the vehicle straddle a segmented aluminum reaction rail. A high frequency current is switched on as a coil pair crosses an edge and remains off as they overtake the next segment. This induces surface currents which repel the coil. In essence, the pulsed coils push off segment edges because at the high frequency of operation, the flux has insufficient time to penetrate. In contrast to conventional LIMs, the performance actually improves with velocity, even for a minimal motor consisting of a single coil pair reacting with a single plate. This paper will present results of proof-of-principle tests, electromagnetic computer simulations, and systems analysis. It is concluded that this new linear induction motor can be implemented using existing technology and is a promising alternative propulsion method for very high speed rail transportation.

Physical Description

8 p.

Notes

OSTI as DE95013017

Source

  • Society of Automotive Engineers future transportation technology conference and exposition, Costa Mesa, CA (United States), 7-10 Aug 1995

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  • Other: DE95013017
  • Report No.: SAND--95-1125C
  • Report No.: CONF-950857--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 81022
  • Archival Resource Key: ark:/67531/metadc739592

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  • June 1, 1995

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 14, 2016, 6:47 p.m.

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Kelly, B.; Turman, B.; Marder, B.; Rohwein, G.; Aeschliman, D. & Cowan, B. SERAPHIM: A propulsion technology for fast trains, article, June 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc739592/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.