What is Ripple Voltage in your ESC and How to Reduce it?
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- Опубликовано: 14 июл 2024
- Ripple voltage is known as the fluctuation in voltage between the voltage source and the ESC. Ripple voltage if it gets out of control can destroy your ESC.
Ripple Voltage can be monitored within some ESC's internally. In this case you can get an entire data log of a run you make to be analyzed on your computer. This is where you are able to check in with your system.
While analyzing your run you want to be certain that ripple voltage does not exceed the maximum recommended value. If the ripple voltage exceeds the max value once within a run, it is highly recommended to make some changes to improve the value.
There a handful of ways that you can reduce ripple voltage. Anything from reducing load to adding a cap pack. The video covers all methods.
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Here is the video referenced in this video:
Why use a cap pack in an RC Car?
• Why use a Cap Pack on ...
Article on Ripple Voltage and How to Improve it:
www.radiocontrolinfo.com/ripp... 
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Excellent information. I'm building a drag car so this is relevant. I just finished your two videos on battery and ESC wire length and the information was incredibly helpful. Thanks Ryan!
Thank You Baxrok2!
Awesome video my friend. I've converted a 100cc plane to electric setup and was worried about ripple voltage. After watching this I realize I shouldn't have any problems.🤞 I'm running a motor that pulls around 180amps at full throttle, with a 250amp esc and 9200 mah 12s battery packs/ 2 6s in series. Thank you for sharing your knowledge with the rest of us. You have a new sub!
Great to hear! I do prefer to use an ESC that can measure the ripple voltage to know for certain.
The amount I learnt from this video is astonishing 🤯 and the worse thing is at my age I have no words worth their weight in gold to thank you 💯
Hey just P. X, thank you for the comment!
perfect explanation, could not of asked for any better, no joke!
Iam learning lot about bldc motors from ur channel , thx
Thank You for the comment Subin Mathew. I'm glad to hear the channel is helping.
Thanks for this video. It made me realize I need better batteries to have the ability to oversupply amps to my ESCs. As long as my motor and prop don't demand more than the ESC and battery can supply, it should work out with a more efficient setup. Constant amps near the battery's limit, or above it, only damages the battery and results in puffing or killing a cell slowly.
You are a great teacher! I love you videos! Thank you very much from your Brazilian fan! 😁🇧🇷
Thank you! 😃
Best explanation I have found on the 'Net to date, excellent.
Hi Don, thanks a ton for the generous comment!
Hi, you have an excellent channel with a lot of information, thanks for it. I am dealing with this very issue in connection with my project, I have a fishing kayak with a small Haswing W20 brush motor (17A/12v max) and I am converting it to a remote control for a small controller on my neck. For the speed control, I chose a brush ESC with a continuous current of 80A, the supply case of the ESC is 6mm2 (10 gauge) thick and 1m long, from the ESC to the motor is 70cm long. All connectors are XT60 rated at 60A. I see the problem in the battery, it's a deep cycle AGM lead acid battery and of course it has a significant voltage drop under load. Fully charged it has 12.8V and at maximum engine power the voltage drops to 12.2-12.1V, when it is discharged the voltage to empty is 12.1V and under load it drops to 10.9V. I think I will have problems with feedback spikes and I don't want to destroy expensive electronics. While searching for a solution, I came across the information that I would pre-order one 470uf low ESR on every 10cm of cable, that means a bank of 10 470uf/35V capacitors. I don't have a problem with that, but it annoys me that I can't calculate it exactly, people on the forums are not willing to give advice, they are angry when someone doesn't control electronics like they do :-/. I am no stranger to electronics, can you advise me how to make a calculation? Thank you very much for your help ..........Jerry
I use a 14S 2P Li-ion setup to power my F-22 EDF jet. The Li-Ion cells have a vary large voltage drop - under load, the initial 4.2V drops to 3.7V easily. I actually chose the motor as for a 12S li-po power system.
You made me think about getting that capacitor pack quickly :D
Excellent break down.
Thank You Luis?
Learn alot of from your videos. Ty very much new subscriber here. Please carry on on your channel 🙏
Great stuff as usual!
Thank you rhouse21!
Watching this week before my exam thank you so much 😊 u great teacher
No problem. You got this!
Thank you very much.
Nice demonstration
Thank You Happy Jack!
I like your videos man they are very well detailed ... I would like you also try to explain more about quadcopters ESC, VTX,RX CAMERA! Thanks keeping doing the good work !
Noted! thanks
got u sooon as ends come i app your time doing this wish class was this interesting in sschool
thanks for the comment Bobby.
Thank u sr. This word is nt enough for u. I leaned alot from Ur videos.
Hi M Ravi DTS, thanks a ton for the kind words!
thanks for your great video .
can u think of any problems spinning a brushless motor connected to esc will cause for the esc cant find any thing on youtube
Where does the 10% nom volt rule come from? Just curious as to why and how they settled on 10% or more battery sag is an inefficient system. Excellent video presenting great info!
It came from the esc manufacture
For improvements You left out larger gauge wire for less resistance in the power system especially if you don't have the option for shorter wires. Waiting for the day to see an esc that comes with 6-4 gauge wire lol
Hey Caribbean Mafia, you are correct. I thought I talked about it in the improvement section of the video. I didn't have it written on the white board and remember providing a brief explanation why. Maybe it was in a previous cut and not the final cut of the video.
Appreciate the information. Surely ripple current applies to FPV race and freestyle quads?
Yes it does
Great videos!! Need some help, u might know, bought a eurofighter 90mm and esc beeps (once i conect the battery to esc ) but receiver does not light up ( receiver works find i tested on other plane), i guess is the servo cable from de esc to receiver might be cut off, how can i doble xheck that?
Sounds like the esc won't arm with the receiver. I would check your throttle setting and make sure it matches what the esc expects.
I think you should explain this in terms of ripple current as that's the usual EE method for explaining this phenomenon. The voltage isn't so much the issue, it's the combination of capacitor's ESR and frequency that's the issue. Most manufacturers don't account for the capacitance loss due to frequency as well as the ripple current, resulting in caps failing rather quickly.
Hi isogen. Thank you for your comment.
The capacitors on the ESC don't need to fail first to take out the ESC. Excessive ripple voltage will destroy the ESC through voltage breakdown if not managed.
There are ESC's on the market that will log the ripple voltage to make it very easy to manage.
@@RCexplained Fair point. Do you know if it kills the MCU in the ESC or some other part?
Hi! Is it safe ( I mean, it would increase ripple voltage) to use a series (deans) connector adapter to connect my two 2s batteries to my ESC. The adapter is 100mm. long aprox Thanks!
Question.... lets say I'm using less than ideal batts, or as you call them weak batts. The higher than average IR drops in the battery will produce more heat locally in the battery, The voltage sags or ripple caused by weak batts at the ESC will warm up those ESC caps creating more heat. Is there any reason to believe the motor runs any hotter on weak batts?
The motor would have less output therefore less heat using weaker batteries.
Nice video, question what If you run more MAH with a higher C rating. Like 7000mah at 70c. Would that help your ripple.
Thank You. Discharge current is a function of capacity and the c rating. Increasing both will help for sure.
RCexplained thank you sir, I’ll keep you posted.
Friend, please ask me a question! on an engine that says 3s can i use a 4s battery if i use a 2 to 4s esc?
I can't recommend doing that however I can tell you that as long as you stick within the mechanical and electrical limitations of the motor it can be possible.
Ultimately, It's best to find a motor that has the right kv to match your setup.
I have a question about ESC's is there a way to test an ESC for maximum voltage without destroying it? I have an existing ESC that is rated for 2S however many people have found that they can run 3S with it without any problems. However this seems to be luck of the draw. I really would like to hook up a multimeter or something and find out if the ESC I have actually can take 3S without just throwing a 3s battery on it only to find out I smoke the ESC. Please let me know if there is a simple way to test an ESC for max sustained voltage without killing it.
I would recommend following the manufactures recommendation for cell count. Most manufactures place the maximum cell count on the ESC spec. If exceeded, the ESC is destroyed.
Will the ripple voltage cause the whole system voltage to spike above 25.2V ? (6x4.2=25.2)
so, only the ripple voltage can damage the esc, not the over peak voltage? is that true?
If your ESC does not have the capability to log ripple voltage, how would you measure it?
Are TRX connectors good?
I've swapped TRX connectors out for XT60. This doesn't mean they are not good. Good is relative.
Great video, well explained, dunno why I’m asking this I kinda already know the answer
I have two LiFe batteries I had planned to run in my truggy
It’s a hobbywing max8 150 amp
The batteries are two 3s 4200mah 30c
Bad idea ?
I’ve been doing it but is it time to stop lol?
Also this batter has a “60c burst is it helps tho I’ve heard from some it’s bogus
I’ve also since learned my deans connectors might me insufficient 😂
LiFe batteries are good. As long as you don't have excessive heat in anything you are good to go.
@@RCexplained thanks and just curious, why are LiFe different than lipo in this case when it comes to esc amp pull
They have lower voltage but can dump some serious power.
what happens to your esc if u run a motor that’s 140 amp if your esc is say 120 amp ?
If you load the system up so that the motor draws only 10A then nothing. It depends on what your load is and then the weakest link in the chain is the first to fail.
oh ok, cuz i ran a 140 amp motor with my mamba monster esc and it was fine. and i heard that esc was only 120 amp
The specification on the motor is a maximum. Did you load the motor to this maximum? How many amps did you actually pull?
RCexplained was geared to 40-50 mph, 1730 kv in my 8th scale buggy, is max amps only applied if u gear to max speed?
I'm a little confused...... If a higher C rating means MORE amps.... doesn't that mean MORE current? How would adding MORE help protect against too much? I'm not understanding this part.
If an ESC is 150amps..... and you're using a battery that can output 125 amps max... wouldn't that mean the ESC is safer than if the battery could output Amps EXCEEDING the ESC's amp rating?
Hello upplsuckimcool16, I hope this long winded answer can help you out.
A higher C rating means a higher maximum discharge rate. This means the battery has the potential to deliver more current. Key thing here is that the battery, ESC, or even the motor do not decide how many amps go through the system. The load placed on the motor decides how many amps are pulled. The battery does not force current in amps through the system. The ESC does not force current to the motor.
Another key point to understand is batteries, ESC's and motors operate similar to how humans do. Imagine you run a foot running race against a friend. If your friend is winning you may push as hard as you possibly can, possibly risking passing out and collapsing just to take the win. Your body has a maximum sustainable amount of output, some people push hard enough to exceed this. Some that do exceed this burn out / collapse and don't finish the race.
Electrical components are the same except they don't make any decisions. If asked they try their hardest to deliver. That 125A (max continuous current) battery will put out one thousand amps if you ask it to. (Although, I don't want to be standing there if you try.) The difference is that the voltage output would be significantly lower than nominal. This is the part that is very bad for ESC's.
150A ESC vs 125A Battery. If the motor was loaded such that it draws 150amps from the battery and ESC, the battery would push 150A but would have a significant voltage drop. Besides your battery more than likely burning up, the ESC will have to cope with some significant issues because of the lack of a good power source.
It sounds like you are treating the 125A spec as a hard cut limit and at 126A there's nothing left in the battery. But in actuality the specification is based off of a manufactures tested thermal limit of the battery pack in a very specific environment. Results vary.
@@RCexplained Im not sure you really addressed my confusion.....
when you say there is not a hard vut limit of 125 amps then i wouldnt really argue... but how large of a margin of error are you ascribing to this number? Im specifically talking about voltage spikes drawing more than it should from thr battery and more than the ESCs are rated for..... For instance, a mini quad copter crashes and the PID controller spikes out of control causing pretty massive voltage spikes.... Would these spikes have any relationship to the ripple voltage? I guess im assuming they do.... If thats wrong then that would clear up ny confusion come to think of it
"but how large of a margin of error are you ascribing to this number?" Margin of error is irrelevant as you can pull over 500% in actuality. The maximum specification you are referring to, is not the batteries maximum capability. As mentioned above, it is the manufactures interpretation or recommended maximum based on the thermal limit of the pack in very specific environmental conditions.
I'm assuming you mean current spikes. Current spikes can cause ripple voltage concerns but not always. If your battery can not supply the current demanded by the system while maintaining an adequate load voltage, ripple voltage would be a concern.
@@RCexplained I dont understand..... doesnt mAH x C rating= amps??? Ur saying it = 1/5 amps? Youve completely lost me.... werent you talking about how a human pushes himself that being the max load before he passes out? A human cant exceed 5x that exertion
mAh x C rating represents maximum continuous discharge current
Why does extending leads increase ripple?
smokin escs
Strange question. Does adding ferite or neodymium magnets to the outside of a brushed dc motor reduce low rpm torque? Trying to wrap my head around why it increases power and rpm. By increasing the field shape/pull? Can brushless motors increase rpm with external magnets on an in runner? Sorry if these are the dumbest questions you've ever been asked.
Increasing the magnetic flux in a brushed motor would reduce the kv and increase the kt of the motor. Brushed motors with a small can thickness would typically have flux rings added to help increase magnetic flux.
Brushless motors do not have a magnet on the outside of the can like a brushed motor does. The rotor that is spinning in the center of the motor, houses the magnet. Therefore magnets on the outside of the can would not help.
@@RCexplained that's what I was thinking. Does it do anything bad other than wear out the brushes quicker on a brushed motor?
bad soldiers