working principle
The German siko encoder consists of a photoelectric encoder with a shaft on the center, which has a circular pass and a dark engraved line. It is read by the photoelectric transmitting and receiving devices, and four sets of sine wave signals are combined into A, B, C, and D. Each sine wave is 90 degrees out of phase (360 degrees relative to a cycle), and the C and D signals are inverted, superimposed on the A and B phases to enhance the stable signal; and another Z phase pulse is output per revolution. Represents the zero reference position.
Since the two phases A and B are 90 degrees out of phase, the encoder can be obtained by comparing the A phase before or the B phase to determine the forward and reverse rotation of the encoder, and the zero reference pulse can be used to obtain the zero reference position of the encoder. The material of the encoder code disc is glass, metal and plastic. The glass code disc is deposited on the glass with a very thin engraved line. The thermal stability is good and the precision is high. The metal code disc is directly passed through and the line is not broken. However, due to the certain thickness of the metal, the precision is limited, and its thermal stability is one order of magnitude worse than that of the glass. The plastic code disk is economical, and its cost is low, but the accuracy, thermal stability and life are both poor. .
Resolution—The number of passes or dark lines that the encoder provides at 360 degrees per revolution is called resolution, also known as resolution indexing, or directly numbered lines, typically 5 to 10000 lines per revolution.
effect
It is a rotary sensor that converts rotational displacement into a series of digital pulse signals that can be used to control angular displacement. It can also be used to measure linear displacement if the encoder is combined with a gear bar or a screw.
After the encoder generates an electrical signal, it is processed by a digital control CNC, a programmable logic controller PLC, a control system, and the like. These sensors are mainly used in the following areas: machine tools, material processing, motor feedback systems, and measurement and control equipment. The angular displacement conversion in the ELTRA encoder uses the principle of photoelectric scanning. The reading system is based on the rotation of a radial indexing disk consisting of alternating light transmissive windows and opaque windows. The system is illuminated entirely by an infrared source such that light projects the image on the dish onto the surface of the receiver, which is covered by a layer of grating, called a collimator, which has the same window as the disc. The job of the receiver is to sense the change in light produced by the rotation of the disc and then convert the change in light into a corresponding electrical change.
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