Demagnetize parts close to magneto-elastic sensor in mid drive motor

[raficzeqq]

Hello. I need to demagnetize certain parts inside a mid-drive e-bike motor. The parts that need to be completely neutral are the crankshaft, torque tube, spring, ratchet, and drive cog. Inside the motor, there’s a magneto-elastic sensor that’s not functioning correctly. The most likely cause seems to be a disruptive magnetic signal from one of these components.
Due to water damage, I had to grind down and polish the crankshaft, which might have caused it to gain some magnetism. However, the magnetism could also be coming from other parts. I'm considering using a demagnetizing tool like the one in the picture. It works well on tools and watches—I’ve seen others using it successfully—but I’m unsure if it’s precise enough, given the high sensitivity of the magneto-elastic sensor.
I believe this sensor operates in the microtesla range and measures torque while pedaling. Would this tool be effective when high precision is needed?

 

[MagMike]

Demagnetizers aren't precision instruments. They produce an alternating magnetic field and as you slowly pull the part away, the alternating magnetic field sensed by the part gets weaker and weaker, eliminating much of the residual magnetizer. Effectiveness depends on many variables, but the multipole pattern from a magnetic chuck will likely be erased.

There's no way to give you a definitive answer if it'll work, you'll just have to try it out and see.

 

[raficzeqq]

Thank you for answer!