The difference between potoelectric encoder and magnetic encoder.！

Photoelectric encoder is a center of the axis of the optical encoder, on which there are ring-pass, dark engraved line, a photoelectric transmitter and receiver devices to read and get a signal of a class of sensors, mainly used to measure the displacement or angle. Conventional optical encoder disc material is glass, metal, plastic, glass disc is deposited on the glass thin groove, the thermal stability and accuracy can reach the common standard, the general requirements, but easy to break. Metal code directly to the disc and not through the groove, not friable, but because the metal has a certain thickness, there is a limit on accuracy, the thermal stability of the glass disc is worse than an order of magnitude. Plastic disc is economical, its cost is low, precision and high temperature can not meet the high requirements. The magnetoelectric encoder adopts magnetoelectricity design. Through the magnetic induction device, the magnetic field is used to generate and provide the absolute position of the rotor. The magnetic device replaces the traditional code plate, which makes up the shortcomings of the photoelectric encoder. With anti-seismic, corrosion-resistant, pollution-resistant, reliable and high-structure more simple. Photoelectric encoder is in the code plate to calculate the accuracy of groove, so the higher the accuracy, the code will be larger, the larger the encoder, and the accuracy is not continuous. Magnetic encoder is not such a limit, you can do a small volume, high precision, especially the absolute encoder requires high precision, more suitable for magnetic encoder.

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