Sensors, Volume 25, Issue 6
2025 March-2 - 316 articles
Cover Story: In response to the accurate positioning issues related to high-speed moving lens groups in rapid zoom optical lenses with voice coil motors (VCMs), we demonstrate a positioning system design based on tunnel magnetoresistance sensors. Based on analytical computation, the optimal air gap between the sensor and the magnetic grating is determined. We quantify the magnetic interference of the VCM using three-dimensional flux leakage mapping, deriving an optimal sensor position. Position error caused by interference remains below 5 μm with maximum deviations at the trajectory endpoints of the moving group. Our study provides a comprehensive framework for the design and optimization of magnetic positioning systems in optical applications with electromagnetic motors. View this paper - Issues are regarded as officially published after their release is announced to the table of contents alert mailing list .
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