exactly what I meant. Thank you!"thank you for writing it up Don. What causes the discrepancy in actual kv for two motors rated at the same kv? Same wind, same wire thickness , what gives ?"
Tolerance differences, a draggy bearing, end turns that didn't get pulled down as tightly as another motor, magnets that are stronger or weaker, maybe the magnets didn't get snugged down to the rotors shaft as tightly and they are closer to the stators teeth making a tighter air gap. This will make the kv a little lower but also increase the torque a little. If a motor gets to hot, the magnets can loose some of their strength and their pull to the stator will be reduced. This will lower the torque and raise the kv.
It really works out to be pretty danged close to the same for a given motor brand and wind. Like with the AQ 2030, I have checked maybe 25 motors and they all run between 1900 and about 1970. With the most of them being 1930-1960
This is with ONE motor brand and size, if that's what you meant. If your talking about between different brands, but with basically the same specs, then that's a whole different story.
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