How to Select and Optimize Kv of an RC Brushless Motor
Ғылым және технология
We are able to optimize the kv of a brushless motor by using a correct process. This process includes knowing the application that we intend to run a brushless motor in. The second component to this equation is knowing the intended LiPo battery that you would use. The importance here is the total cell count in order to determine the nominal voltage to be used.
Once these couple items are understood, the kv of a brushless motor can be determined by using a known RPM range for the application. Follow the guidelines on the radiocontrolinfo website for correct RPM ranges. These are unloaded total RPM outputs that we are interested in.
Select a specific RPM within the RPM range. As a very basic rule of thumb, select a higher RPM within the range if you are trying to achieve higher speeds. A lower RPM within the range if speed is not as important.
Lastly, use the RPM and nominal voltage to determine the kv value. This calculated Kv value does not require you to purchase an exact match. It would be rather difficult to find an exact match. Instead, find a suitable motor that is within a small percentage difference of your calculated Kv.
The important part that gets more in to the overall power system selection of your application is this: (outside scope of video)
The load that you place on the power system will ultimately determine the success of your power system. Too large of a load can get you in to serious problems that can destroy components of your power system. Too high of a load can be too large of a prop diameter or pitch for an airplane/boat or too high of a pinion tooth count for an RC car.
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Thank you for your effort of explaining everything! All your episodes are very helpful!!! Greetings from Poland :)
@RCexplained
4 жыл бұрын
Hey Tomasz, appreciate you taking the time to comment! I'm happy to hear the videos are helpful! Cheers from Canada.
From my experience in 1/8 car racing I found oversizing my motors and much lower kv rating, then gearing it up to compensate target rpm. My 4292 motor size at 1100kv on 4s battery with large pinion results in much better efficiency, cooler temps and longer run time on the same battery
What Kv motor and amp would you suggest for a traxxas 2wd rustler with 90t and 48p gearing (I’m getting a combo motor and esc so don’t worry about overloading the esc)
Excellent - just what I was looking for - one question though - where did you look up the rpm range from. I run 1/12 scale pan cars but never seen anything about rpm ranges. Thanks
@RCexplained
4 жыл бұрын
Often times it comes from experience, understanding similar power systems others are running. Knowing the speed that you are targeting also helps with RPM range required to get there.
I just want to know what’s the best upgrade to go a little faster on a zelos 48 has a 1000kv brushless motor. esc I hear its 120A
@RCexplained
3 жыл бұрын
Hi Andy, what were you looking to do to go faster? Guys have replaced components in the hull but that adds up ($$$) very quickly.
Hello, recently I broke a 2300 Kv edf ducted fan, and I am thinking of reusing the motor with a propeller for a plane. Is it possible or it will underperform severely? Thanks in advance.
looking for help with the matching of a rocket 600kv rc boat motor and esc ..what amp should we use and what battery size ??
@RCexplained
4 жыл бұрын
Take a look at the boat power system selection video. kzread.info/dash/bejne/ZKip2NF6lrOzibg.html
Hi thanks for your great work. How could I know how much load that i can place on the power system? And how could I know the RPM range that I need in my application? I am planning to equip the brushless motor with propoller and produce thrust force to push the robot car on the wall.
@RCexplained
4 жыл бұрын
Hey Leyuan Ma, take a look at ecalc. This website will help.
@leyuanma4886
4 жыл бұрын
@@RCexplained OK!Thanks very much!
And what if I can't locate any spec information? Example art-tech falcon 3d heli. With motor B20/10T part number H3D043
@RCexplained
2 жыл бұрын
If you own this motor, you can measure all specs. Videos to do this are on this channel
Since brushless motors usually have high rpm. How can I use for slow speed boat?
@RCexplained
3 жыл бұрын
You can use an Outrunner with a low Kv
Maybe you should start the video by actually explaining, what kV is.
@RCexplained
3 жыл бұрын
Hi Anton N., I have the perfect video for you, check out this link: kzread.info/dash/bejne/ZGiYys6AhrfSgJs.html.