Quote:
Originally Posted by BrianG
I would try to isolate the wires as much as possible away from the motor wires, especially not running parallel to them. They could be picking up EMF from all three phases at once. Or maybe it is getting "confused" between each phase firing and the PWM pulses that make up each pulse...
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This seems to make the most sense. At lower power, like in reverse, the power is only sent to the motor briefly and then the motor spins a little from momentum and hence acting like a generator. There is obviously something resonating with the sensor.