Handwheel principle！

Photoelectric encoder, is a photoelectric conversion through the output shaft on the mechanical geometric displacement into pulse or digital sensor, is currently the most widely used sensor. The general photoelectric encoder mainly consists of grating disc and photoelectric detection device. In the servo system, since the photoelectric encoder is coaxial with the motor and the motor rotates, the grating disk rotates with the motor at the same speed. And a plurality of pulse encoder signals are outputted by a detection device composed of electronic components such as light-emitting diodes. By calculating the number of pulses per second of the photoelectric encoder, the speed of the current motor can be reflected. In addition, in order to determine the direction of rotation, the code disc can also provide a phase difference of 90 ° of the two channels of light code output, according to the dual channel light code to determine the state of the motor steering. According to the detection principle, the encoder can be divided into optical, magnetic, inductive and capacitive. According to its scale method and signal output form, can be divided into incremental, absolute and mixed three kinds.

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