Why Hall Sensors Can Detect Position and Speed
Hall sensors appear in door contacts, limit switches, speed sensing, brushless motor commutation, magnetic encoders, and current sensors.
They are often thought of as “small switches that trigger when a magnet gets close”. That is usable, but incomplete.
The first model is: a Hall sensor detects magnetic field, not the object itself. Position, rotation, or current can be detected only if they reliably change the magnetic field at the sensor.
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