The basic knowledge of rotary encoder！

The encoder as a sensor (Sensor) class, mainly used to detect mechanical movement speed, position, angle, distance, or count, in addition to applications in industrial machinery, many motor control such as servo motors, BLDC servo motor required with encoder for motor controller as a commutation, speed and position detection is so broad range of applications. Based on the detection principle, the encoder can be divided into optical, magnetic, inductive and capacitive. The method according to the scale and form of the output signal, divided into incremental encoders and absolute encoders. Photoelectric encoder using the diffraction grating principle of displacement - digital conversion, from the 1950s used in machine tools and computing equipment, because of its simple structure, high accuracy, long life and other advantages, at home and abroad attention and promotion, in precision aspects of positioning, speed, length, acceleration, vibration, and other widely used.

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