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We can help with that, if we know what you need.I don't have the resources to develop an entirely new circuit, sad to say.
We can help with that, if we know what you need.
Max current from a 20V source with a 4.5Ω coil = 4.4A .I reckon we need ~5 A to Fire
In your attachment, you show a low-side switch. In post #26, you said the low side had to be grounded.Two current generators (actually voltage generators for my purpose, since the coil has a fixed resistance). iGen 1 is Fire; iGen 2 is Hold.
Both supplied from a 20 V, high capacity source.
Each is actuated by a low current, timed pulse, orginally from the flywheel.
Both timed pulses act at the same moment. But Fire acts briefly whereas Hold continues longer. Fire is about 0.5 ms but can be varied; Hold is about 1 ms but is more variable. (ms is 10^-3 sec).
The solenoid is 4.5 Ω, ~2 mH,.
I reckon we need ~5 A to Fire (=pull plate across space), ~2 A to Hold.
In the lower figure, the timer could be acting on the iGens attached below the coil.
What do you think? Do-able ?
Malc
What's up with that?We can't put it on the low side, the way we have the set-up.
In your attachment, you show a low-side switch. In post #26, you said the low side had to be grounded.
What's up with that?
If you want 5A in 0.5ms you will need a much higher voltage than 25V.
Just to keep things clear here-1 ms. OK - it is very tricky. You're damned if you do, damned if you don't.
The point is, though, it actually doesn't matter if it's (relatively) slow to rise. Just bear with me here a moment: if the flywheel is turning at 30 r/s, in your 1 ms, it has turned 360/30 degrees, ie 12 degrees. So I just time Fire 12 degrees earlier than I want. But it is an interesting point because I might have been Firing later than I thought.
Anyway, how long it takes to build the current doesn't matter in one sense. My timing starts whenever it is open (=Fire). But I suspected the problem was slowness in closing - that's where you've been helping here.