Magnetic encoder is a new type of Angle or displacement measuring system, its principle is to use magnetic resistance or element to change to measure the Angle or displacement values of magnetic materials, magnetic materials Angle or displacement change will cause a certain resistance or voltage changes, through single chip microcomputer or analog signal output pulse signal after processing, to achieve the purpose of measuring. Concentric codes are extended from the center of the coencoder code disk to the outside of the coder, and each layer of code is more than twice the size of the inner layer. The first layer is only a light-transmitting sector and an opaque sector. The second floor of the center has two light-transmitting sectors and two opaque sectors. There are four in the third layer and the opaque sector. Embedded sensing head volume is small, be applicable to the small installation space, and USES the high level of protection design, can use in the bad environment, in industrial situations can avoid the sensitivity of the general optical environment pollution, increase the system stability.
Magnetic encoder by A central shaft of light code disc, on which there are circular and dark scribed line, have read photoelectric emission and receiving devices, obtain four groups of sine wave signal is combined into A, B, C, D, each phase sine wave by 90 degrees, will reverse, C, D signal superimposed on A, B two phase, can strengthen stability of signal; The other output is a z-phase pulse to represent zero reference bits. Because of A, B two phase difference of 90 degrees, but only through A phase in the former or B phase in the former, with forward and inversion of magnetic encoder, through the zero pulse, can obtain the zero reference. Magnetic encoder code disc material with glass, metal, plastic, glass encoder is in the deposition of thin scribed line on the glass, its thermal stability, high precision, metal encoder directly to scribe lines and impassability, but because has certain thickness of metal, precision is limited, its thermal stability is an order of magnitude worse than glass, plastic encoder is economical.