Red Dave said: (quoted from post at 11:39:27 06/23/09) "No it doesn't: that's the point. The current simply transfers to the diode. Since the current through the inductance is not interrupted there is no inductive kick.
In some applications one adds an RC snubber network to bring the current down more rapidly (at the price of some inductive kick) than the rate determined by the RL time constant"
We must be thinking of two different things here. I don't see how opening the contacts wouldn't interupt current through the field coils.
Oh, opening the contacts interrupts it alright, but the inductor doesn't like that (picky critters that they are), so it immediately reverses polarity & begins to dump its stored energy in order to maintain that current, either thru the plasma of the arc across the contacts or the now forward biased diode, RC snubber, etc.
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