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Comparison of Magnetic Field Sensor Technologies for the use in Wheel Speed Sensors

机译：磁场传感器技术对车轮速度传感器的比较

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The measurement of the rotational speed and angle of a rotating shaft is one of the most frequently used measurement in all fields of mechanical engineering. Different sensing principles, such as optical or magnetic, are commonly used. However, magnetic based sensors offer highest robustness to harsh and dirty environments and are therefore the preferred solution in automotive applications. Even if magnetic based speed sensors exist since decades, their performance is continuously improved and adjusted to the different applications. The paper introduces the sensing arrangement for speed measurement of a rotating shaft. The state of the art magnetic sensing technologies, which are Hall, AMR (anisotropic magnetic resistance), GMR (giant magnetic resistance) and TMR (tunneling magnetic resistance), are described and their limitations are shown. In addition, the recently developed high-linearity-TMR is introduced. The key parameters of the evaluated sensing technologies are compared to each other. The result shows that the recently developed high-linearity-TMR (tunneling magnetic resistance) sensing technology offers the best overall performance.
机译：旋转速度和旋转轴的角度的测量是机械工程领域中最常用的测量之一。通常使用不同的传感原理，例如光学或磁性。然而，磁性的传感器为苛刻和肮脏的环境提供最高的稳健性，因此是汽车应用中的首选解决方案。即使自数十年以来存在磁性速度传感器，它们的性能也不断改进并调整到不同的应用。本文介绍了旋转轴速度测量的感测布置。描述了本领域磁感测技术，其是霍尔，AMR（各向异性磁阻），GMR（巨磁阻）和TMR（隧道磁阻），并显示其限制。此外，介绍了最近开发的高线性 - TMR。评估的传感技术的关键参数彼此相互比较。结果表明，最近开发的高线性 - TMR（隧道磁阻）传感技术提供了最佳的整体性能。

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