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Gear count and resolution

Paul Jenn
Prodigy 60 points

If I were to do the gear-count, suppose the gear plate is thin, then I would want to have a very low resolution because of vibration that may exist, right?

  • 0
    TI__Genius 9300 points

    Hello Paul,

    I'm not sure I quite understand what you mean. Thin gear plate - is it like in watches mechanisms? Could you please elaborate on intended application?

    The rule of thumb is that the coil diameter has to be comparable to the gear size, and be at the coil radius distance from the teeth for reliable counting.

  • 0 in reply to Evgeny Fomin
    Prodigy 60 points

    Say I am doing the gear-count perpendicularly on something like a chain transmitted gear, the vibration may cause the distance from target (teeth) to the coil change a little.  In this case, do I want to have high or low resolution, considering there is nothing in between teeth. 

  • 0 in reply to Paul Jenn
    TI__Genius 9300 points

    Generally speaking, high resolution is always better than low resolution, unless there is a strict limitation on bandwidth or computational power. It's easy to make low resolution out of high, and impossible the other way.

    Now, regarding the vibrations - can you give me an idea of the severity?

    Let's say, how big are the teeth, how close to them we can place the coil, and what is the order of magnitude of the expected vibrations?

  • 0 in reply to Evgeny Fomin
    Prodigy 60 points

    The triangular gear shape has an area of about 0.5 cm sq.  The distance from the sensor is 1 cm.  The vibration is within 1mm.

  • 0 in reply to Paul Jenn
    TI__Genius 9300 points

    I assume the shain gear is still at least 1mm thick, correct?

    How does gear tooth counting frequency compare to vibrational frequency?

    The distance is somewhat far, is it possible to move the coil closer?