This letter presents a novel speed sensor based on motion-induced eddy currents in conductive moving parts. The magnetic yoke is an E-shaped ferrite core. The excitation coil is on the center leg of the E-core, and two antiserially connected pick-up coils are on the side legs. Solid iron and aluminum materials are used for the moving part in the simulations and in the measurements. Two-dimensional and 3-D finite element methods are used for a detailed analysis and for the parametric calculations of the eddy current speed sensor. Despite its simple structure, the proposed eddy current speed sensor shows high linearity. The analysis and the measurements are performed at various speeds and excitation frequencies for an evaluation of the performance of the eddy current speed sensor. The minimum linearity error is less than 0.5%.

中文翻译：

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一种新型铁氧体 E-Core 涡流速度传感器

这封信提出了一种基于导电运动部件中运动感应涡流的新型速度传感器。磁轭是 E 形铁氧体磁芯。励磁线圈在 E 芯的中心腿上，两个反串联的拾波线圈在侧腿上。固体铁和铝材料用于模拟和测量中的运动部件。二维和 3-D 有限元方法用于详细分析和涡流速度传感器的参数计算。尽管结构简单，但所提出的涡流速度传感器显示出高线性度。分析和测量在各种速度和激励频率下进行，以评估涡流速度传感器的性能。最小线性误差小于 0.5%。