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Difference between tachogenerator and Encoder

Discussion in 'Electronic Basics' started by karthik, May 31, 2006.

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  1. karthik

    karthik Guest

    What is the differnce between Tachogenerator and Encoder
    Pls explain me
     
  2. BobG

    BobG Guest

    tach gives analog volts/rpm. Encoder gives A and B pulses in a 90deg
    out of phase pattern, can be 16 counts/rev up to 4096 counts/rev
    depending on encoder
     
  3. Dorian

    Dorian Guest

    -Tachogenerators provide an AC voltage which is proportional to speed just
    like standard AC generators. The frequency of this waveform, of course, is
    also proportional to speed. Having a voltage proportional to speed
    simplifies analog control of a motor.

    -Encoders typically provide a series of pulses proportional to rotation or
    distance. Some encoders provide a binary number representation of rotation
    or distance where 0001 represents position 1, 0010 represents position 2,
    0011 represents position 3, etc. You can calculate system speed by measuring
    the time between these pulses or positions. Having a set of pulses
    proportional to distance simplifies digital control of a motor.

    Dorian
     
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