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Rotation Switch

Discussion in 'General Electronics Discussion' started by DanielW, Mar 12, 2014.

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  1. DanielW

    DanielW

    1
    0
    Mar 12, 2014
    Hey I was wondering if there is a type of switch that turns on when rotation slows down or a switch that turns on when rotation starts. Thanks
     
    Last edited: Mar 12, 2014
  2. KMoffett

    KMoffett

    696
    68
    Jan 21, 2009
    Not a simple switch, but a tachometer followed by a missing pulse detector set to the desired minimum frequency/RPM. What rpm are you wanting to be the trigger point?

    Ken
     
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,267
    Nov 28, 2011
    Could this be done mechanically using centrifugal force?

    Back before ECUs, car engines had a centrifugal system in the distributor, I think, to adjust the timing according to the engine speed. That's not what you want, but you might be able to use the idea. Maybe... :)
     
  4. duke37

    duke37

    5,329
    750
    Jan 9, 2011
    Do you mean 'slows down' or do you mean stop.
    An analog output tachometer can have its signal differentiated to set a bistable on speed up and reset on slow down.
    The rate of speed up and slow down will need to be defined.
     
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