Torque of Cross-Coil Type Ratio-Meter

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Torque of Cross-Coil Type Ratio-Meter by Tositaka HAYASI The author has already reported about the rigorous solution of an intensity distribution of the magnetic field Hθ between the two soft-iron circular cylinders placed eccentric each other; that is, Hθ=Hs(1+M)/(1+Mcosθ) where, θ=angle of deflection Hs, M=certain constants He applied the above equation to a cross-coil type ratiometer using such a non-uniform magnetic field as stated above. Given in the following are the results of his study concerning the torque of this instrument: 1) Concerning the condition for stable equilibrium, the author found that when Hs is in a minimum (or maximum) value of Hθ, two moving coils of this instrument should push (or pull) each other. 2) D=Df|hm-h0| where, D=torque for full-scale deflection Df=torque of one of the two coils constituting the moving part hm=intensity ratio of magnetic fields of the two coils F and V when they are at a maximum deflection; that is, hm=(Hv/Hjf)m h0=same ratio as stated above when the two coils are at a minimum deflection |hm-h0| is approximately 0.03 to 0.4 in value. 3) The instrument is designed according to the constants which is selected to make the torque as strong as possible. 4) The sources of errors, especially of the error due to the change of supply voltage, are discussed.
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