力平衡式测量仪表用磁电式力发生器线性特性的研究

A Study of the Linearity of the Electromagnetic Force Generator used in Force-balance Instruments

磁电式力发生器为力平衡式测量仪表的一重要元件,其线性特性将直接影响该测量仪表的精度。本文首先论证了产生非线性特性是这种力发生器原理上所固有的。然后,导出了计算力发生器线性度用的公式。实验结果证明该公式可行。利用该公式,在设计和使用力发生器时,便可有意识地把对力发生器提出的精度指标用来选择、协调和控制力发生器的有关结构参数和使用参数。

The electromagnetic force generator is an important component of force-balance instruments. The linearity of such generators affects di-rectly the accuracy of the measuring instruments. This paper has proved that aforce generator of this kind has non-linearity which comes inherently fromits working principle. A formula has been worked out to calculate the terminallinearity of the force generator, so that the design of such devices to meetspecified accuracy criteria will be facilitated.