direction sensing circuit for motor

Discussion in 'General Electronics Chat' started by devalvyas, Mar 21, 2009.

  1. devalvyas

    Thread Starter Active Member

    Nov 11, 2008
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    0
    Hi again ..

    I am interested in detecting the direction of rotation of a micro motor..can anyone please help with a simple circuit and schematics of a quadrature encoder using flipflops that can help me know direction of rotation..

    i am not interested in knowing the speed of rotation..

    the motor shaft will be rotating at speed between of 6000 to 12000 rpm

    thanks
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Using a quadrature shaft encoder, feed one of the encoder outputs to the data input of a D-type flip-flop and the other encoder output to the clock of the D-type flip-flop.

    hgmjr
     
  3. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,576
    231
    Is it possible to just detect the polarity of the power to the motor?

    Ken

    OOPs! missed part of the request. :(
     
    Last edited: Mar 21, 2009
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Take a look at Question #7 on this worksheet taken from the AAC workbook.

    hgmjr
     
  5. devalvyas

    Thread Starter Active Member

    Nov 11, 2008
    80
    0

    Yes i looked at it...will this circuit give me a 0 or a 1 output based on the whether the direction of motor movement is cw or ccw? Will i be able to get this information in first one or two rotation of the motor once it starts rotating?

    is there any chance of a false trigger based on the position from which the rotation of the disk starts wrt the led's and sensors? I mean irrespective from which ever stand still position the disk is at start with respect to the sensors the output of the d-flip flop should give correct trigger once the motor starts rotation..


    i am interested in knowing the direction through external mechanism which does not interfere with the power supply to the motor...hence can do the power sensing per se...
     
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