On 02/18/2020 03:06 AM, Les Newell wrote:
Hi Jon,
Thinking about it, you're mostly right. I didn't think it
through. My suggested spacing assumes the teeth are
square, which of course they are not.
The actual spacing is going to depend on the sensing range
of the sensors and width of the tips of the teeth. 1/4
tooth spacing is likely a good starting point. You aren't
going to get anywhere near perfect 90 degree quadrature
but there isn't much you can do about it.
The ATS667 series have two Hall sensors, and detect the
passing of the tooth from closer to one sensor to closer to
the other.
So, it always is supposed to switch right as the leading
edge of the tooth passes the exact center of the sensor.
Actually, they give VERY good quadrature and quite close to
50% pulse width, at least on my system.
Jon
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