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  1. #21
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    Quote Originally Posted by thermite View Post
    ...

    This one is "universal", all motors or drives 10EE used up to 20 FLA and a bit, conservatively rated:

    Hammond Reactor
    195M20
    20 mH @ 20 A DC

    Good for use with all of the 10EE motors, 3 HP (one of mine) or 5 HP (everettengrs' 5 HP GE Kinematic, see thread). Smooths 'em out, tames the spikes.

    ...
    Thanks Bill.

    The Hammond 195M20 is pretty pricey, $329 from Newark: https://www.newark.com/hammond/195m2...-15/dp/52F9510

    The 10mH version, 195J20, is $169 but Newark doesn't stock them: https://www.newark.com/hammond/195j2...-15/dp/52F9525

    It looks like 20A DC reactors go for about $80 on eBay. There are 2.5 and 5.0 mH Hammond 195s there now.

    Cal

  2. #22
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    Quote Originally Posted by Cal Haines View Post
    Thanks Bill.

    The Hammond 195M20 is pretty pricey, $329 from Newark: https://www.newark.com/hammond/195m2...-15/dp/52F9510

    The 10mH version, 195J20, is $169 but Newark doesn't stock them: https://www.newark.com/hammond/195j2...-15/dp/52F9525

    It looks like 20A DC reactors go for about $80 on eBay. There are 2.5 and 5.0 mH Hammond 195s there now.

    Cal
    I might even buy one. Or a Rex. Scouting 3-Phase DC drives for "one more experiment".

    NB: make sure the ratings are for continuous, even if pulsed & dirty, DEE CEE.

    The lower-inductance ones would knock the sharp edges off the leading-edge.

    Similar to dv/dt filters on a rude-bugger VFD, that's all it takes to protect older motors.

    The SCR drives at least don't have the HF corona-makers.

    Nominal 2-pulse = 120 Hz on 1-P, nominal 6-pulse = 360 Hz on 3-P. And then,, there are the synthetic phase of staggered-firing tricks, witness those EIGHT trigger-inductors on the SSD 4Q DC Drives. And then .... "24-pulse" 3-P Drives - the original patent is out there online.

    The lower inductance units just would not silence the 120 Hz growl of the motor as the fat 20 mH one does. The 6 or 24-pulse 3-P drives are smoother, but they still have the fast-rise leading-edge overshoot spikes.

    MG is still entitled to a smug grin. "Rotating power" is pretty smooth, late 1800's technology or otherwise!



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