Electronics > Beginners
How to improve Solenoids open/close response time ?
soldar:
--- Quote from: Albatroon on March 17, 2019, 12:14:17 pm --- There's no problems at all, I can drive the valves with simple Transistor. I did it before and worked good enough.
All what I am hopping is MAKE IT BETTER. I
That's why I doing my research, Asking here.. Testing different circuits to Achieve the best result !
--- End quote ---
Make it better? That is quite vague. Better in what way? Because complicating the drive circuit for no discernable effect is not going to make it "better" but will make it more complex, expensive and prone to failures.
If you want to improve something, anything, the first thing to establish is what exactly are we trying to achieve. "Better" is meaningless as too broad.
You have a working design but you want to make it "better". If a viewer saw the initial product and then the improved product in what way would he say it is better?
Because, you might have heard "if it ain't broke don't fix it". I do not know what we are trying to fix here.
Suppose we add some electronics and the solenoid opens one millisecond faster. What effect will it have? What leads you to believe the effect will be noticeable?
Albatroon:
--- Quote from: soldar on March 17, 2019, 01:21:05 pm ---Make it better? That is quite vague. Better in what way? Because complicating the drive circuit for no discernable effect is not going to make it "better" but will make it more complex, expensive and prone to failures.
If you want to improve something, anything, the first thing to establish is what exactly are we trying to achieve. "Better" is meaningless as too broad.
You have a working design but you want to make it "better". If a viewer saw the initial product and then the improved product in what way would he say it is better?
Because, you might have heard "if it ain't broke don't fix it". I do not know what we are trying to fix here.
Suppose we add some electronics and the solenoid opens one millisecond faster. What effect will it have? What leads you to believe the effect will be noticeable?
--- End quote ---
I mean by better here a better resolution.
If the valves Open/Closed faster than they are now, It supposed to have a better image quality.
Maybe If i forced those valves with a better drivers I achieve my goal..
And I'll compare the classic transistor driver with this new circuit to see if any Improvement.
I saw some videos for companies out there built this fountain, Some of them looks amazing.
I know that my valves are not the best.. I am just trying to get the most performance out of them.
Albatroon:
--- Quote from: MrAl on March 17, 2019, 01:17:51 pm ---Hi,
Just to note, the energy stored in the coil is proportional to the Volt Seconds which is simply volts times the time in seconds. That means to dissipate a given energy W first the stored energy can be looked at as:
W=v*s*K
with K a constant, and to dissipate that energy we have to dissipate W units, so we have the same:
W=v*s*K
Now if we quantify the energy going in:
W1=v1*t1*K
and going out:
W2=v2*t2*K
and so with unsigned voltages we must have close to:
W2=W1
to dissipate nearly all the energy.
This simply means:
v2*t2*K=v1*t1*K
reducing, we get:
v2*t2=v1*t1
and if we solve for the dissipation time we get:
t2=t1*v1/v2
and here it is plain to see that as we increase v2 the time t2 reduces and that's the goal.
t1 is automatically limited because of the fixed voltage v1, but obviously if v1 is lowered t2 reduces that way too.
So the rule is minimum v1, maximum v2. The practical limit on v2 is closely related to the drain source voltage rating of the transistor so the choice of transistor is also a key factor.
--- End quote ---
Too much for a Hobbyist to understand ;D
Richard Crowley:
Isn't it common practice for higher performance to drive stepper motors with a higher voltage than rated, but with a series resistance to limit the steady-state current. The reasoning being that provides a higher immediate current (while the coil is "charging") for fast action, while limiting "resting" current to safe levels for the motor.
There are several different designs of solenoid-operated valves. I would think that the exact nature of the valve design (and the static pressure of the source) might be even more critical parts of this exercise than the speed at which you can drive it open and closed.
Zero999:
I have been involved in a similar project before, which did a similar thing but with high pressure air. Instead of bootstrapping or series resistors, a separate higher voltage power supply was used. A negative supply voltage was also used to speed up the turn off time. Unfortunately I wasn't involved in the design, so can't comment on whether any of it was necessary. I think the higher positive voltage might have helped with the speed, but I thing the negative voltage was just an over-complication.
It's possible that the solenoid might not be the main bottleneck in the speed, but more investigation is necessary to determine this.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version