Position Detection System for Moving-Magnet Linear Motors Based on a Magnetoresistive Sensor Array
Jun Wang, Xiang Chen, Quyan Chen, Qing Xi, Haiyang Sun
TL;DR
This paper presents a new position detection system for moving-magnet linear motors using magnetoresistive sensors, offering high accuracy and no length limitations.
Contribution
A novel position detection system using magnetoresistive sensor arrays for moving-magnet linear motors is proposed.
Findings
The system achieves a linear correlation coefficient higher than magnetic grid rulers.
Position detection accuracy of ±9 μm is demonstrated experimentally.
The method supports long-distance position detection without length limitations.
Abstract
The moving-magnet linear motor has received considerable attention in the development of logistic and factory automation in recent years. A reliable position detection system is the key to achieving the precise position and control of the motor. At present, the magnetic grid-scale and grating-scale are the most widely used traditional detection methods. However, these are not suitable for position detection with moving-magnet linear motors. They have the disadvantages of being easy to disturb, having a high cost, and exhibiting a limited measurement range. In this work, a moving-magnet linear motor position detection system based on an array of magnetoresistive sensors is used. The array is configured by arranging the magnetoresistive sensors at equal intervals along a line parallel to the trajectory of the armature. Then, the permanent magnet is fixed on the rotor and detected by…
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Taxonomy
TopicsMagnetic Field Sensors Techniques · Magnetic Properties and Applications · Electric Motor Design and Analysis