Speed encoder

The tachometer encoder is generally connected to the shaft. The pulse quantity of the tachometer encoder is fixed. When the shaft rotates, the tachometer encoder will output pulses, and the PLC or counter will receive the pulses. When the speed of the shaft is different, the unit The total amount of pulses received in the time is different, and the speed is shown here. According to the amount of pulses and the actual length of revolution, the real speed m/min can be calculated.

The speed measuring encoder consists of a photoelectric code disc with a shaft in the center, on which there are circular and dark engraved lines, and is read by photoelectric transmitting and receiving devices to obtain four sets 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 materials of the speed encoder code disc are glass, metal, plastic. The glass code disc is made of thin scribe lines deposited on the glass, which has good thermal stability and high precision. The metal code disc is directly engraved with through and impassable lines and is not easily broken. , 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 tachometer 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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