01-27-2014, 04:50 PM
Yes I would be describing a resonant circuit if the Z(l)=Z© if it weren't for that resistor.
However the resistor in the first place will shift the phase and will dampen the resonance.
I think they use the resistor to compensate for the field coil own resistance which is pretty close (1140 Ohm vs 1000 Ohms ) so the cap could be chosen to have the same impedance as the coil at the 60Hz.
The effect is the same during the resonance (counter-phased currents at the same frequency) but it is not really a resonance once you introduced the loss element in there.
However the resistor in the first place will shift the phase and will dampen the resonance.
I think they use the resistor to compensate for the field coil own resistance which is pretty close (1140 Ohm vs 1000 Ohms ) so the cap could be chosen to have the same impedance as the coil at the 60Hz.
The effect is the same during the resonance (counter-phased currents at the same frequency) but it is not really a resonance once you introduced the loss element in there.
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