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how many types of encoder there

Discussion in 'Electronic Design' started by [email protected], Jun 16, 2007.

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  1. Guest

    Iam having doubts

    how many types encoders are available and where it is used

    what type of out put an encoder will give
    please give the answer
     
  2. Gary Tait

    Gary Tait Guest

    wrote in @q19g2000prn.googlegroups.com:
    It depends what you are encoding.
    Is it one data form to another?

    audio/video?

    Some physical property?

    It can be endless.
     
  3. Jamie

    Jamie Guest

    Is this a pop quiz ?
    How about an incremental type of encoder?, they
    come in various forms.
    A,B,Z/ A+,A- B+,B-, Z etc (Q Types)
    then you have some that only has one output pulse.
    A = main pulse, B or the Q signal is an offset from
    A so that direction can be detected.

    The +/- types give you more precise indexing with out the
    higher speeds that would normally be required on a single output.
    Z is the zero point..
    In some systems, especially those that use the +/- with Z, the
    equipment has an auto tune function to detect the PPR of the encoder
    via the Z signal, and uses the +/- outputs in calculating the position
    of the rotor of an AC motor for example, so that better tracking can be
    had, when controlling the speed of an AC motor. Normally drives that
    need this kind of tuning requires you to disconnect the motor shaft from
    it's load so that the drive can properly calculate encoder's position
    with the rotor so it can generate a consistent torque..

    Then there's the Gray code types. those are parallel outputs and
    used for Absolute positioning. They come in different output bit sizes
    but in any of them, the whole idea is to make sure no 2 or more bits get
    changed in their state at the same time other wise. This would cause
    problems where 2 bits may not trigger properly at the same time, thus
    giving you an erratic values whilst switching over to the next position.
    The end results is a value that ranges from 0..16 for example, in a 4
    bit type, in a complete turn.
    etc..
     
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