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Magneitc encoders！
Changchun Rongde Optics Co.,Ltd. Release time：2016/7/21 Browse：669Magnetic encoders were developed to replace contact encoders in applications limited by rotational speed.Magnetic encoders operate by detecting resonant frequency change,a magnetization change,or a magnetic staturation in an inductor.For each method,flux induction by the magnetically coded disc affects the change by aiding or inhibiting an existing state.Thus,for each principle,two normal states exist corresonding to logical one or zero.
The resonant frequency type unilizes a tuned circuit,the frequency of which represents one logical state,and the detuning of the circuit representing the opposite logical state.
In the magnetic stauration method,the inductor is either saturated or nonsaturated.Alternately,the reluctanceof the magnetic circuit is effectively translated to logical ones and zeros.
Resolution is limited by the size of the magnetized spot and complicated by interaction between magnetized spots on adjacent tracks.Magnetic encodes overcome the basic speed limimation of contact encoders and offer greater longevity by eliminating physical contact between disc and sensor.Also,magnetic encoders function well in environments hostile to contact types where any of the magnetic scanning techniques can be successfully employed.However,high ambient fluxes or radiation densities can destroy the disc patter or inhibit saturated core operation .Greater precaution against mutual electromagnetic interference is required whe magnetic encoders are included system.
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