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Are DC servo motors linear?

Discussion in 'Electronic Basics' started by Eric R Snow, Mar 8, 2005.

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  1. Eric R Snow

    Eric R Snow Guest

    I know the subject doesn't say it all. I would like to compare some DC
    servo motors without having to mount them each on the machine. I have
    figured out how to apply an equal load, measure rpm, measure voltage
    and amperage. Because of the difference in the motor shafts and mounts
    it is easier to measure these off the machine. So if the motors are
    tested at a lower than normal voltage and amperage do the results
    scale up easily?
    Eric R Snow
  2. If you use the motors within their ratings, they
    are linear for most purposes, neglecting the
    stationary friction and brush friction. So if
    your standalone measurements are done at
    sufficient speed to dwarf those effects, they
    will scale without any great surprises.

    As for "scale up easily", I presume you can
    use a calculator if your arithmetic skills are
    not sufficient to easily perform multiplication.
  3. Eric R Snow

    Eric R Snow Guest

    Thanks for the reply Larry. I think I remember enough math. I can
    still make change calculations than the checkers at the store. But
    that's not saying much...
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