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Help with stepper motor driver

Discussion in 'Electronic Repair' started by Isaac Wingfield, Oct 6, 2003.

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  1. I'm running a three-phase stepper from a 12 volt battery, and I need the
    highest possible efficiency. The battery needs to last as long as

    I'm using 100 Volt Vceo drivers, but I still need stopper diodes to
    control the transients. I've put a 100 ohm resistor in series with the
    diodes, which allows about a 50-60 volt turn-off transient -- as much as
    I feel comfortable with.

    The 100 ohm resistor ( which dissipates energy from all three windings,
    via the three diodes), still runs quite hot, so there's an unfortunate
    loss of efficiency there.

    What kind of tricks can I pull to recover the transient energy that
    shows up when the drivers switch off (that is, the energy that heats the
    resistor)? Is there something I can do with a transformer, that would
    recover the energy and let me re-use it?

    thanks, Isaac
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