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External magnetic fields can also push their material's permeability to well below the saturation point. One alternative is ironless inductive encoders as the one here: Eddy currents generate contrast to deliver 64 pulses at up to 120,000 rpm. They are connected differentially to double the sensor's output voltage. As the encoder wheel rotates past one pole (two sensor strips), the output voltage completes one cycle, generating a 40-mV peak-to-peak signal from a 5-Vdc power supply.
These bearings are not designed to support high loads, and should not be exposed to extreme shock, vibration, full system load, or that arising from misalignment.