公开(公告)号：US4494022A

公开(公告)日：1985-01-15

申请号：US592583

申请日：1984-03-23

申请人： Toshio Kawara ,  Yoshihumi Shibahara

发明人： Toshio Kawara ,  Yoshihumi Shibahara

IPC分类号： G01G7/02 ,  G01G7/04 ,  G01G23/48 ,  G01L1/08 ,  H01F7/18 ,  H02K41/00 ,  G01G3/14

CPC分类号： G01G7/02 ,  G01L1/086

摘要： An electromagnetic force-transducer comprising a magnetic circuit and an electromagnetic coil kept movable in the static field provided by said magnetic circuit. The electromagnetic coil consists of two coaxial parallel windings wound on a common frame with a distance kept between the both. The magnetic circuit comprises an inner magnetic path and an outer magnetic path with a cylindrical clearance left therebetween. In the upper and the lower part of the clearance there are provided with an upper magnetic gap and a lower magnetic gap, respectively. The magnetic field in the upper gap and that in the lower gap are directed oppositely to each other. The coil frame is kept movable vertically in the cylindrical clearance, positioning one of the two windings in the upper magnetic gap and the other in the lower magnetic gap. The two windings are current-supplied in the directions opposite to each other to produce their respective electromagnetic forces in the same direction. Thus, the magnetic fields produced by the two windings are cancelled by each other, so that the resultant magnetic field by the entire electromagnetic coil does not affect the fields provided at the magnetic gaps by the magnetic circuit.

摘要翻译： 一种电磁力传感器，包括磁路和电磁线圈，其可在由所述磁路提供的静态中保持移动。 电磁线圈由缠绕在公共框架上的两个同轴并联绕组组成，两者之间保持一定距离。 磁路包括内部磁路和外部磁路，其间留有圆柱形间隙。 在间隙的上部和下部分别设置有上磁隙和下磁隙。 上间隙中的磁场和下间隙中的磁场相互指向。 线圈框架保持在圆柱形间隙中垂直移动，将两个绕组中的一个定位在上磁隙中，另一个在下磁隙中。 两个绕组在彼此相反的方向上电流供应，以在相同的方向上产生它们各自的电磁力。 因此，由两个绕组产生的磁场被彼此抵消，使得由整个电磁线圈产生的磁场不会影响由磁路在磁隙处提供的磁场。

公开(公告)号：US4577709A

公开(公告)日：1986-03-25

申请号：US565019

申请日：1983-12-22

申请人： Yoshihumi Shibahara ,  Akira Komoto

发明人： Yoshihumi Shibahara ,  Akira Komoto

IPC分类号： G01G3/14 ,  G01G21/23 ,  G01G3/08 ,  G01G21/24 ,  G01L1/22

CPC分类号： G01G21/23 ,  G01G3/1402

摘要： There is disclosed a weighing scale in which a non-Roberval type load cell is used to detect a weight to be measured. The load cell used consists of two parallel cantilevers with the free ends connected to each other through a connecting means and of four strain gauges applied to the cantilevers by sticking every two of the four strain gauges on two separate positions in the longitudinal direction of each of the cantilevers. The four strain gauges constitute a bridge circuit which outputs the weight value of a weight placed on a weighing tray connected to the two cantilevers so that the center of the tray is positioned above the center of the plane made by the two cantilevers. According to this invention the weighing errors due to an eccentric or uneven weight loading on the tray are automatically eliminated on account of the structural symmetry of the load cell used. The difficulties in manufacturing a Roberval type precision load cell have finally be put out of the way by the present invention.

摘要翻译： 公开了一种称重秤，其中使用非Roberval型称重传感器来检测要测量的重量。 使用的称重传感器由两个平行的悬臂组成，其自由端通过连接装置相互连接，并通过将四个应变仪中的每两个在每个的纵向上的两个独立位置上粘贴到悬臂上来施加四个应变计 悬臂。 四个应变计构成一个桥接电路，输出重量值，该重量值放置在与两个悬臂连接的称重托盘上，使托盘的中心位于由两个悬臂制成的平面的中心之上。 根据本发明，由于所使用的称重传感器的结构对称性，由于托盘上的偏心或不均匀的重量加载而产生的称量误差被自动消除。 制造Roberval型精密称重传感器的困难终于被本发明推倒了。