Electronics > Beginners
How to improve Solenoids open/close response time ?
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soldar:
Some cars use an ingenious system for the solenoid which activates the starter motor. The solenoid engages the starter gear and also connects the starter motor. The solenoid has two windings; one goes directly to gnd while the other one goes to gnd through the starter motor winding. At first both windings are energized but once the solenoid has moved one winding is no longer active and only the other one is enough to provide holding force.

In any case, there is a mechanical limit on how fast things can move. You can improve a bit by using more voltage to activate and reverse voltage to deactivate but if you need really fast response you will need to design the entire electro-mechanical thing from scratch. For instance, a solenoid with a short travel which moves a lever which amplifies the distance.
viperidae:
Have a look at this datasheet, it's a peak and hold injector driver.
http://www.ti.com/lit/ds/symlink/lm1949.pdf

The injector opens fast, as 4x normal current is applied, it then lowers to a 1x holding current.
The lower holding current means it turns off faster, as there is a smaller magnetic field to collapse.
Zero999:
Or remove the free wheeling diode and put the zener in reverse parallel with the transistor.

Yes bootstrapping can be used to double the supply voltage. I did a simulation awhile back with LTSpice.
https://www.eevblog.com/forum/beginners/12v-dc-to-110vac-pure-sine-converter/msg2221902/#msg2221902

langwadt:

--- Quote from: rstofer on March 11, 2019, 09:17:46 pm ---
--- Quote from: Albatroon on March 11, 2019, 08:07:07 pm ---Thank you for your replay.
Do you have any ideas how to make it open faster?

--- End quote ---

The fastest it will run is with no diodes but that isn't possible because there is a body diode in the MOSFET.


--- End quote ---

the body diode is in the opposite direction, with no external diode the flyback voltage will be limited by the mosfet avalanche voltage
which the mosfet might be rated for and and do just fine

coppercone2:
I would research what happens to lifetime of these components if you start slamming them with transients.

Is there lifetime literature? It seems like a engineering bear
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