Study on high precision single-pole magnetic encoder based on error analysis and compensation method

This paper introduces the basic principle of single-pole magnetic encoder and its application in industrial field, and analyses three main sources of errors of single-pole magnetic encoder, including unequal amplitude of signal, non-orthogonal phase of input signal, and high order harmonic in input signal. According to the principle of the decoding algorithm of the magnetic encoder, the paper pushed out mathematical expression of each kind of error, and developed the corresponding compensation measures according to these expressions. Finally, we using the STM3232F103 microprocessor as the carrying platform of the algorithm and the 16-bit precision servo motor system as a reference, verified the validity of the error compensation algorithm.