In my previous experiments with linear motors, where we need to collapse the field in a coil as quickly as possible(sounds familiar
) I used a TVS diode rated just below the voltage rating of the switch, ie 870V for a 900V rated switch. Wouldnt a TVS diode prevent ringing better than a resistor? Or not... If not, then for choosing a specific dampening resistor for a given coil what is a good method for doing so. Scoping the waveform and using a 1K 2 watt pot, adjusting until the best results?

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