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1. 发明授权

US5351003A Temperature compensated magnetoresistive position sensor 失效
标题翻译：温度补偿磁阻位置传感器
公开(公告)号：US5351003A
公开(公告)日：1994-09-27
申请号：US42228
申请日：1993-04-02
申请人： Harry J. Bauer , Ronald T. Golebiewski
发明人： Harry J. Bauer , Ronald T. Golebiewski
IPC分类号： G01B7/00 , G01D3/036 , G01D5/14 , G01D5/16 , G01R33/09 , G01B7/14 , G01D5/18 , G01R33/06
CPC分类号： G01D5/142 , G01B7/00 , G01D3/0365 , G01R33/09
摘要： A temperature compensated magnetoresistive position sensor is disclosed. The sensor includes two magnetoresistor (MR) elements biased with magnetic flux from a permanent magnet, and connected electrically in series with a precision resistor and a voltage source. A magnetically permeable slide bar is movable to positions within a defined range adjacent to the sensor for varying the magnetic flux and changing the resistance of each MR element, while maintaining the sum of the resistances of the MR elements essentially constant. For a given slide bar position, the voltage drops appearing across the precision resistor and the MR elements are processed by a computer to determine the value for a resistance ratio, where the resistance ratio equals the resistance of one of the MR elements divided by the sum of the resistances of both MR elements at the sensor operating temperature. The determined value for the resistance ratio is transformed based upon the sum of the MR element resistances to obtain a compensated resistance ratio value that would occur for the same slide bar position at room temperature. The compensated resistance ratio value is then used in conjunction with the known behavior of the sensor at room temperature to provide an accurate indication of the slide bar position that is essentially unaffected by the influenced of sensor operating temperature. A correction term can also be added to the compensated resistance ratio value to account for any mechanical offset associated with sensor component tolerances.
摘要翻译：公开了一种温度补偿磁阻位置传感器。该传感器包括两个由永久磁铁偏磁的磁阻（MR）元件，并与精密电阻和电压源串联电连接。磁导滑动杆可移动到与传感器相邻的限定范围内的位置，用于改变磁通量并改变每个MR元件的电阻，同时保持MR元件的电阻之和基本恒定。对于给定的滑块位置，精密电阻器和MR元件之间出现的电压降由计算机处理以确定电阻比的值，其中电阻比等于MR元素之一的电阻除以和在传感器工作温度下两个MR元件的电阻。电阻比的确定值基于MR元件电阻的总和而变换，以获得在室温下相同滑杆位置发生的补偿电阻比值。然后将补偿的电阻比值与室温下传感器的已知行为结合使用，以提供基本上不受传感器工作温度影响的滑杆位置的精确指示。还可以将补偿项加到补偿电阻比值上，以考虑与传感器元件公差相关的任何机械偏移。

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