Could you not also develop a power profile from the CT to an ADC across the
duration of the stroke ?
Then you could easily compare that to the profile that would result if the
stroke didn't complete..

Chris

>
> The current in the solenoid is exactly the same whether it
> moves or not,
> but its slope is not, because L changes with the armature moving. I
> suppose low L for unmoving and higher L *after* moving. If
> you look at the
> energy of the decay pulse (when you release the Darlington),
> the high L
> should give you higher energy. If the solenoid closes the
> magnetic circuit
> fully when it strokes to the end, the increase will be large,
> otherwise
> pretty small. You could measure this with a current sensor in
> the kickback
> circuit driving a simple integrator.
>

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