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Magnetism and induced current

  1. May 25, 2010 #1
    I dabble in miniature milling/machining with my home CNC setup. I'm building a low temperature engine and have a question. The piston will be a neodymium magnet(s) set in graphite. Rather than using mechanical linkages and a crankshaft I want to use magnets to control the length of throw. By adjusting the position of the two 'controlling' magnets I should be able to control the throw of the piston.
    Imagine a shaker flashlight with the magnet(s) set in graphite and two opposing magnets halting the movement of the magnet at each end of the slide. Attachment included if you want to visualize it. You can move, zoom, rotate, or hide parts to visualize it better if necessary.

    The intention is to build a configuration that induces the most current in a coil around the cylinder.

    My question is; If I put a magnet on each end of the piston and want to use two more magnets to control the throw should I arrange then

    N (fixed magnet) N(fixed magnet)
    S (fixed magnet) S(fixed magnet)

    S (piston) S(piston)
    N (piston) N(piston)
    N (piston) S(piston)
    S (piston) N(piston)

    S (fixed magnet) N(fixed magnet)
    N (fixed magnet) S(fixed magnet)

    I understand the flux lines will impact each other and am looking for the optimal configuration. The throw of the piston is only about .6 inches. Should I perhaps use a single magnet in the piston?



    Attached Files:

  2. jcsd
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