外延展螺旋形绝对式时栅角位移传感原理及器件OA

To address the limitations associated with absolute coding and ultra-precision photolithography in the design and fabrication of traditional absolute angular displacement sensors,a novel time-grating-based absolute angular displacement sensing method employing an extended spiral structure is proposed.Two sets of sinusoidal and cosine excitation windings with extended spiral geometries were ar-ranged on the inner and outer rings of the stator.These windings are spatially orthogonal and possess oppo-site pole numbers.An alternating magnetic field was generated using time-orthogonal excitation signals through time-division multiplexing,effectively reducing electromagnetic crosstalk and establishing a map-ping relationship between temporal signals and spatial angular displacement.Variations in the magnetic field were detected by induction windings to obtain displacement signals,and absolute angular displace-ment was determined using a combined"positioning+measurement"strategy.Experimental results indi-cate that an absolute measurement error of±11.2″ was achieved within a full 360° range.Arcsecond-level absolute position measurement was realized using sensing units with ten-thousand-arcsecond resolution,thereby eliminating the dependence of traditional absolute displacement sensors on absolute coding and ultra-precision photolithography while significantly reducing manufacturing complexity.The proposed method is suitable for angular displacement measurement in harsh environ-ments such as those contaminated by oil,demonstrating significant academic relevance and engineering ap-plication potential.