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    • 48. 发明授权
    • Temperature compensated differential transformer and a measuring device
using the same
    • 温差补偿差动变压器及使用其的测量装置
    • US5789918A
    • 1998-08-04
    • US733136
    • 1996-10-16
    • Katsunori ImaiYuji Takahashi
    • Katsunori ImaiYuji Takahashi
    • G01B7/00B23Q17/20B24B49/14G01B7/12G01D3/036G01D5/20G01D5/22G01B5/08H01F21/06H01F27/28
    • G01D5/2046G01B7/12G01D3/036G01D5/2291
    • A differential transformer includes a primary coil for excitation and first and second secondary coils for detection which can be wound up on an outer surface of a bobbin made of a non-magnetic substance. In the bobbin, i.e., in a differential coil composed of the primary coil and the first and second secondary coils, a core is movably inserted in an axial direction thereof and is made of a magnetic substance. In the differential transformer, when AC current is applied on the primary coil, an induced voltage corresponding to a relative displacement between the core and the differential coil is generated, so that a size of a measured member can be measured by detecting the induced voltage. In the first and second secondary coils, a compound conducting wire is used, which includes two conducting wires which are different from each other in forms of a thermal coefficient of resistivity and are connected by a predetermined rate with regard to their length. Therefore, it is provided that the differential transformer can obtain a detection value corresponding to the relative displacement between the core and the differential coil regardless of a change of the ambient temperature.
    • 差动变压器包括用于激励的初级线圈和用于检测的第一和第二次级线圈,其可以卷绕在由非磁性物质制成的线轴的外表面上。 在线轴中,即由初级线圈和第一和第二次级线圈构成的差分线圈中,芯沿其轴向可动地插入并由磁性物质制成。 在差动变压器中,当在初级线圈上施加交流电流时,产生与芯和差动线圈之间的相对位移对应的感应电压,从而可以通过检测感应电压来测量测量部件的尺寸。 在第一和第二次级线圈中,使用复合导线,其包括以热电阻率系数的形式彼此不同的两根导线,并且相对于它们的长度以预定的速率连接。 因此,无论环境温度的变化如何,差分变压器都可以获得与芯和差动线圈之间的相对位移对应的检测值。