Rotary position sensor
Position sensors are used to electronically monitor the position or movement of a mechanical component. The position sensor produces data that may be expressed as an electrical signal that varies as the position of the mechanical component changes. Rotary position sensors frequently employ a magnetic field and a galvanomagnetic sensing element, such as a Hall effect device or a magneto resistor located within the magnetic field. Magnetic position sensors are generally a non-contact type of sensor and consist of a magnetic field sensing device which is usually stationary and a magnet that is attached to a moving component. As the magnet approaches the sensing device the magnetic field of the magnet is detected and the sensing device generates an electrical signal that is then used for counting, display, recording and/or control purposes. Rotary position sensing is used in a number of applications, such as motor position feedback control and/or commutation, cam and crank shaft position sensing for controlling ignition timing, misfire detection, engine speed monitoring etc, robotics, machine tool position control and the like. In a typical magnetic rotary position sensor, a magnet is attached to a rotating member, and a magnetic field of the magnet is applied to a magnetoelectric transducer. The magnetoelectric transducer detects the magnetic field of the magnet which changes in accordance with the rotation of the magnet, and the sensor outputs an electrical signal representing the rotation angle of the rotating member.
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