Mechanical encoder

The mechanical encoder consists of a photoelectric code disc with a shaft in the center, on which there are ring-shaped and dark engraved lines, which are read by photoelectric transmitting and receiving devices, and obtain four groups of sine wave signals combined into A, B, C, D, each A sine wave has a phase difference of 90 degrees (relative to a cycle of 360 degrees). The C and D signals are reversed and superimposed on the A and B phases to enhance the stable signal; in addition, a Z-phase pulse is output per revolution to represent Zero reference position. Since the phases A and B differ by 90 degrees, the encoder's forward and reverse rotation can be judged by comparing the phase A or the B phase. The zero reference position of the encoder can be obtained through the zero pulse.

The material of the mechanical encoder code disc includes glass, metal, plastic. The glass code disc is a thin scribe line deposited on the glass, which has good thermal stability and high precision. The metal code disc is directly engraved with pass and impassability, and is not fragile. , But because the metal has a certain thickness, the accuracy is limited, and its thermal stability is one order of magnitude worse than that of glass. The plastic code wheel is economical and its cost is low, but the accuracy, thermal stability, and life are worse. some.

Resolution—The number of open or dark engraved lines provided by the mechanical encoder per 360 degrees of rotation is called resolution, also called resolution indexing, or directly called the number of lines, generally 5 to 10,000 lines per revolution.

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