Magnetic encoder mainly by the magnetoresistive sensor, drum, signal processing circuit. The drum is inscribed with equal spacing of small magnetic poles, magnetic poles are magnetized, the rotation generated when the distribution of space leakage magnetic field. The magnetic sensor probe changes the magnetic field signal into the change of the resistance value by the magnetoresistance effect. Under the action of the applied potential, the changed resistance value is changed into the voltage change. After the follow-up signal processing circuit, the simulated voltage signal Into a computer can identify the digital signal to achieve the magnetic rotary encoder coding.
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