[Gdeaver]

The magnetic position sensors depend on measuring the orientation of a diametrically magnetized neodymium magnet. The on chip sensor bridges need to be in saturation. The magnet typically needs to be with in 1 to 2 mm of the chip surface. I doubt most motors we use would have a strong enough field to influence the sensor and there are many ECM motors using these chips in place of optical encoders. However having the sensor wires close to a motor could cause problems with brush noise.