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I looking for this fat component (brown ) on a PCB:

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This component using in a textile mill. There is a small metal (buckle) rotating around a disk and this sensor detects whether this small piece of metal is rotating or stopped.

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The component looks like an inductor. In this application is may be being used as a reluctor in that a small DC current is passed through the inductor creating a magnetic field. The rotating metal part affects this field and imparts an AC pulse. Something like a capacitor and comparator is used to detect this and provide a clean pulse.

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    \$\begingroup\$ Or, if the RPM is extremely low, the inductor may act as a metal-detector, but driven by high-freq AC. Or, the small rotating metal part may actually be a strong magnet. \$\endgroup\$
    – wbeaty
    Dec 12, 2020 at 11:56

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