Design and Analysis of Linear Incremental Encoder Based on Back Magnetic TMR Sensors

With the development of modern industry, production methods have become more precise, intelligent and efficient. The processing environment and methods are becoming more and more complex. Stable, accurate and real-time position and velocity measurement is very important. Because the safety and reliability of equipment operation are closely related to the measurement of system control and motion state. Among the mechanical movements of equipment, linear movement is one of the most common and important. In this paper, a simplified position measurement system using Tunneling Magneto-Resistance (TMR) sensing technique is proposed to cater this objective. Compared with other position sensing technologies, magnetic sensing technology still has certain accuracy and reliability in harsher environments. Among many magnetic sensing technologies, magnetoresistive sensors have higher sensitivity and stability, smaller energy consumption and volume, and shorter response time. Among the magnetoresistive sensing technologies, tunneling magnetoresistance effect sensors have the best performance. Use computer-aided design software to model the magnetic ruler, and use computer-aided engineering software to conduct sensitivity analysis. Finally, an encoder is designed based on the analyzed results.