关键词: 磁编码器, 位置解算, 游标卡尺法, 误差补偿, 分辨率

Abstract: Magnetic encoder is a new type of non-contact position sensor, which has the advantages of small size and low cost, and has been widely used in high-precision control fields such as servos and robots. The working principle of magnetic encoders was explained, and the research status and application of magnetoresistive and Hall magnetic encoders were introduced. The position solving methods of unipolar and multipole magnetic encoders were summarized, including forward and reverse tangent method, phase-locked loop method, vernier caliper method, etc. The main error sources of magnetic encoder position detection, such as harmonic distortion, amplitude phase deviation, and random noise, and their error compensation algorithms were analyzed. The performance, application and future development direction of magnetic encoder products commonly used in domestic and foreign markets were further given.

Key words: magnetic encoders, location solving, vernier caliper method, error compensation, resolution