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Old 12th October 2019
Lives for gear
Richard Crowley's Avatar

That looks just like a tape head (perhaps a small "mono" tape head in a cassette machine).
It likely "reads" a magnetic pattern around the flywheel (or some other very close rotating part).
And the signal from that head is what feeds the speed control of the motor.
So that the speed control circuit knows exactly how fast the capstan is rotating.

That little piece off to the right (with the green coil of wire) looks like what is inside a tape head.
A couple of protruding pole pieces and a coil of wire. That is basically what any tape head consists of.

If you had mentioned the model number of your machine (or the motor) we might have been able to offer more help.