Encoder Thoery/Encoder applicaiton/encoder classification！

Position detecting device as an important part of the drive control, whose role is to detect the amount of displacement, and issue the command signal and the feedback signal emitted by the control device is compared, if the deviation, after amplification control execution unit so that the direction of movement toward the elimination of bias until the deviation equals zero. In order to improve the precision of mechanical devices, the need to improve the accuracy of detection element and detection system. Which rotary encoders, linear encoders (encoders, magnetic grid scale), resolver, tachometer generators is relatively common, in which the encoder is one of the most common types of machinery and apparatus for detecting encoder as a signal detection The method has been widely used in CNC machine tools, textile machinery, metallurgical machinery, oil machinery, mining machinery, printing and packaging machinery, plastics machinery, testing machines, elevators, servo motors, aerospace, instrumentation and other industrial automation. Encoder wide range of different industry users of the encoder parameters, specifications vary.

Encoder readout mode points, contact and non-contact two. Contact output using brush, brush contact conductive region or insulating region to represent the status code is "1" or "0"; the acceptance of non-contact sensor is a photosensitive element or magnetic element, when the photosensitive elements through the use of light district and opaque regions to indicate the status code is "1" or "0."

Encoder detection principle points, optical, magnetic, inductive and capacitive.

Encoder measurement points, there is a linear encoder (scale, magnetic grid scale), rotary encoder.

Encoder signal principle (calibration method and a signal output form) points, incremental encoders, absolute encoders and mixed three.

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