The law of the moving-iron instrument
作者:
G.F.Tagg,
期刊:
Journal of the Institution of Electrical Engineers - Part II: Power Engineering
(IET Available online 1943)
卷期:
Volume 90,
issue 13
页码: 73-77
年代: 1943
DOI:10.1049/ji-2.1943.0010
出版商: IEE
数据来源: IET
摘要:
The law of the moving-iron instrument has been quoted in the form: Torqu=½I2dL/dθ, whereIis the current in the coil andd/dθ the rate of change of inductance with angular deflection. This law is deduced on the assumption that the current remains constant for a small change in deflection, but since a change in inductance is produced by a change in current, it does not seem justifiable to assume the current to be constant. The law then takes a more complicated form. Experiments are described showing that the simple law does not hold for a simple electromagnetic system.
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