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    • 9. 发明授权
    • Electromagnetic compensating balance
    • 电磁补偿平衡
    • US4034819A
    • 1977-07-12
    • US641152
    • 1975-12-15
    • Clifford B. AkersRoy A. ApplequistJames E. ApplequistD. James Guzy
    • Clifford B. AkersRoy A. ApplequistJames E. ApplequistD. James Guzy
    • G01G7/04G01G7/00
    • G01G7/04
    • An electromagnetic compensating balance for the measurement of forces having a permanent magnet circuit assembly with an annular enclosed housing and with a central core defining a narrow annular air gap between a portion of the housing and core, and having a movable bobbin concentrically arranged around the core with a coil located in the air gap, the bobbin having end portions projecting above and below the housing which are connected to leaf support members for independent support of the bobbin from the magnet assembly, the upper end portions being connected to a weighing pan for weighing samples. The balance has sensing means comprising a first pair of capacitor rings located above said coil and a second pair of capacitor rings located below said bobbin connected in a manner which eliminates canting effects in said bobbin from a reference position, said sensing means generating a transducer output voltage representing an analog to displacements in the bobbin, said output voltage controlling a servo system for generating a d.c. current through the coil which activates the coil to create a compensating equilibrium force by the bobbin opposing the force of the weighing sample, the servo system having circuit means for providing an analog voltage representing current level said analog voltage controlling an analog to digital measuring circuit which operates with said servo circuit means but is independent thereto.
    • 一种用于测量具有环形封闭壳体的永磁体电路组件的电磁补偿平衡,并且具有在壳体和芯部的一部分之间限定窄环形空气间隙的中心芯,并且具有围绕芯部同心设置的可移动筒管 线圈具有位于气隙中的线圈,线轴具有突出在壳体上方和下方的端部,该端部连接到叶片支撑构件,用于从磁体组件独立地支撑线轴,上端部连接到用于称重的称重盘 样品。 该天平具有检测装置,其包括位于所述线圈上方的第一对电容器环和位于所述线轴下方的第二对电容器环,其以从消除所述线轴的参考位置的倾斜效应的方式连接,所述感测装置产生换能器输出 代表线圈中的位移的模拟电压,所述输出电压控制用于产生直流的伺服系统 电流通过线圈,其激活线圈以产生与所述线轴相反的称重样品的补偿平衡力,所述伺服系统具有用于提供表示电流水平的模拟电压的电路装置,所述模拟电压控制模拟电压,所述模拟电压控制模拟到数字测量电路, 与所述伺服电路装置一起操作,但与其无关。