I assume that you mean to have a capacitor in parallel with a battery or some other power source, right? Or do you mean to power the motor off of a charged capacitor only? Either way, the higher the Farad rating, the more the capacitor can store, so long as the voltage rating is at or higher than the maximum you intend to use. If the motor will draw a whole lot of current, you may also want to consider capacitor ESR, or equivalent series resistance, as this will limit the amount of current the capacitor can supply at any given time (caps in general have low ESR, so it likely won't matter, just be aware of it).Can someone help me to classify capacitors that i can use in dc motors...
And capacitors which discharges in a long period..?
Hi AG, my calculations are not wrong. Just do the math.A capacitor is not a battery. A fairly small battery can power a motor for about 10 minutes if the motor is not working hard.
A huge capacitor can power a motor for a few seconds.
Exponential decay is neither steep or not steep. It depends on the parameters and application.The voltage from a discharging capacitor drops exponentially which is very steep.
True, but can you charge your LiPo battery in 5 seconds, or discharge it to 0V, or re-charge it 100,000 times?But the voltage from a discharging LiPo battery is almost flat and stays up for most of the discharge.
For what use? There are use cases (stated above) where using LiPo batteries will not only get very expensive, but would be dangerous too.A super capacitor is VERY expensive but a LiPo battery is not.
See my other post.What would you pick?
What in Volta's name are you talking about?Stop using strawman arguments.
Using supercaps for long term energy storage are rarely used. They had their era in HEV's (some busses), but they are surpassed by modern lipo technology. Do you see any cellphones using the 'awesome' supercaps?What in Volta's name are you talking about?
Supercapacitors are used in product designs for all the reasons I gave. Don't let your ignorance be used to judge the arguments of others. Either refute what I said with something verifiable or keep your jug corked.
Thanks, mate.
For an 'actual EE' you are pretty limited in your imagination. It's either buses or cell phones, eh? First, I did not say they were for long term storage. Not ever, and certainly not here. Just to anticipate...you are the EE, so I am not going to rhyme off all the places they are used. This is something you should be able to look up yourself. I'm not a librarian and I refuse to cite things that can easily be found using google.Using supercaps for long term energy storage are rarely used. They had their era in HEV's (some busses), but they are surpassed by modern lipo technology. Do you see any cellphones using the 'awesome' supercaps?
I didn't try to refute any of your arguments. I simply supplied some valid cases for the use of super caps. That's it. You're the one that somehow managed to see that as a straw man argument, when it was clearly not. You might want to look up the colloquial meaning of 'straw man argument'. Perhaps you meant something different?You didn't refute any of my arguments. I proved that lipo batteries are way more suited in the terms of volumetric and gravimetric energy content.
Either you can't read or you have trouble following simple thoughts. What I said was,Lipo batteries are just as safe as supercapacitors, don't give me the old batteries are hazardous crap - everything is hazardous if you treat it wrongly.
which is an accurate statement. What it means (and I'll take you to the obvious conclusion here as you seem to have trouble with this sort of thing) is that you would not use LiPo batteries for applications where it is better to use capacitors. Is that plain enough for you? I quoted 3 such cases where LiPos would not be safe, or would fail early. I re-itterateMe said:There are use cases (stated above) where using LiPo batteries will not only get very expensive, but would be dangerous too.
You really are full of yourself, aren't you? I am not on any super cap band wagon. Why don't you read what i wrote again. I say it in simple words for you one more time. All I said was, there are times you should use a capacitor and there are times you should not. I further implied that the times you would use a capacitor are not the times you would use a LiPo. Okay?Thread starter is obviously not familiar with batteries. Neither are you. You're the one that should hop off the supercapacitor bandwagon.
Good for you!- An actual EE.
by Aaron Carman
by Jake Hertz
by Jake Hertz