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    • 1. 发明授权
    • Fast-responsive electromagnetic balance-type weighing apparatus
    • 快速响应电磁平衡式称重装置
    • US5367128A
    • 1994-11-22
    • US678334
    • 1991-05-08
    • Fumihiro TsukasaHideya FujimotoKazuhiko HorikoshiOsamu TanakaKunio Kikuchi
    • Fumihiro TsukasaHideya FujimotoKazuhiko HorikoshiOsamu TanakaKunio Kikuchi
    • G01G7/04G01G1/38G01G3/14
    • G01G7/04
    • A novel electromagnetic balance-type weighing apparatus according to the invention includes a weighing pan/balance beam assembly (15) whose balance beam is angularly displaced as a function of the weight of an object of weighing placed on the weighing pan. An electromagnetic coil (9) is provided to generate an electromagnetic force that offsets the displacement of the balance beam of the weighing pan/balance beam assembly (15) caused by the weight of the object of weighing. A displacement detector (3, 4, 5) is provided to detect the displacement of the balance beam of the weighing pan/balance beam assembly (15). An operation unit (7) performs operations to determine a control voltage in response to the detection signal transmitted from the displacement detector (3, 4, 5). A current transducer circuit (20) generates an electric current in response to the control voltage applied to it by the operation unit (7) and supplies it to the electromagnetic coil (9). The current transducer circuit (20) comprises a negative feedback loop circuit for feeding the output current from said current transducer circuit (20) back to the input terminal of the current transducer circuit (20). A weight calculator (24) calculates the weight of the object of weighing from the output current of the current transducer circuit (20).
    • PCT No.PCT / JP90 / 01639 Sec。 371日期1991年5月8日 102(e)日期1991年5月8日PCT 1990年12月15日PCT PCT。 公开号WO91 / 11688 日本1991年8月8日。根据本发明的新型电磁平衡型计量装置包括称重盘/平衡梁组件(15),其平衡梁作为与放置在所述秤上的称重物体的重量有关的角度位移 秤盘 提供电磁线圈(9)以产生电磁力,其抵消由称重物体的重量引起的称重盘/平衡梁组件(15)的平衡梁的位移。 设置位移检测器(3,4,5)以检测称重盘/平衡梁组件(15)的平衡梁的位移。 操作单元(7)执行响应于从位移检测器(3,4,5)发送的检测信号来确定控制电压的操作。 电流传感器电路(20)响应于由操作单元(7)施加到其上的控制电压产生电流并将其提供给电磁线圈(9)。 电流传感器电路(20)包括用于将来自所述电流传感器电路(20)的输出电流馈送回电流传感器电路(20)的输入端的负反馈环路电路。 权重计算器(24)根据当前换能器电路(20)的输出电流来计算称重对象的权重。