Page 842 - Basic Electrical Engineering
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Here,
where M is the mutual inductance of the two coils and θ is the angle of
deflection.
Let the supply voltage be, v = V sin ωt. Then
m
sinωt and i = I sin(ωt − ϕ) for lagging power factor load
c
m
Therefore,
Average deflecting torque
The control torque is provided by the spring control mechanism.
Therefore,
T = K θ
s
c
