Hi everyone,
I’m using a comparitor (zero crossing) to generate a pulse train from a 3 phase motor (used as a ac generator). I’m using the pulse train to calculate motor rpm. I have the comparitor working however it only works when I contact the rotor or stator body with my finger. I guess this is some grounding issue which eliminates some noise messing with the comparitor but I’m unsure what to do about it! Any ideas would be appreciated. It’s a lm311 inputs to a phase and line with output going through transistor. Like I say it works but only with my finger in contact...
Thanks for reading!
I’m using a comparitor (zero crossing) to generate a pulse train from a 3 phase motor (used as a ac generator). I’m using the pulse train to calculate motor rpm. I have the comparitor working however it only works when I contact the rotor or stator body with my finger. I guess this is some grounding issue which eliminates some noise messing with the comparitor but I’m unsure what to do about it! Any ideas would be appreciated. It’s a lm311 inputs to a phase and line with output going through transistor. Like I say it works but only with my finger in contact...
Thanks for reading!