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Originally Posted by MPaulHolmes
I started testing the sensorless late last night. It was using just a bit too much processing time to smooth out and correct Ialpha, Ibeta, Valpha, Vbeta, and derivative(Ialpha) and derivative(Ibeta), so I'm bumping it up to 29.5MHz instead of the 14.7MHz. oh well! haha. An extra 0.3watt or something like that for sensorless.
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29.5 Mhz it is! More SPEED .. MORE POWER .. !
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I think the ground loop thing might be right. Also, the stepped down +5v signal would be from the +24v supply, which was unfiltered, whereas the +5v supply from the controller was filtered, so combining the 2 5v signals might introduce 5v noise?
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Not sure on that one. The 24V goes to the encoder directly. The 15ish volt A and B channels are voltage divided .. so I guess that would be noisy .. but they share a ground so the reference works. I could use an opto-coupler to transfer the signal from 15V to 5V, then use the 5V from the controller .. but then again, we won't need the encoder soon!
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The nice thing is you can short circuit the 5v regulator all day long and it won't care, so I doubt anything too terrible is broken. Plus, the 64 tick encoder on the motor is more than enough. PLus, it will be sensorless in no time! so who cares! haha.
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Looking forward to sensorless!