Motor Selection

What difference would be noted between using a 800Kv to 900Kv motor (Tiger T-Motor MT2216-12 vs T-Motor MT2216-11 ) on the exact same frame and using the same 12.45 props? I mistakenly bought the 900s but thought to try them anyway.

I currently use the 800s on my Hexacopter but will use these new 900Kv motors on my new quad. Flyweight about 2.3Kgs ( http://www.foxtechfpv.com/glyder-600-quadcopter-aerovideofpv-platfo... )

I mostly want to use 3S lipos to keep with the family of batteries I use for my other copters. 

What would be the pros and cons using the 900Kv motors compared to the 800Kv ones?

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • The 900Kv Motors will spin the props faster and produce more lift, but with the same props they will use slightly more energy to do so.

     

    R_Lefebvre gave me this advice on motors/props:

     

    The KV is how fast the motor wants to run at no load.  As you load it, it slows down from that no-load speed.  As it gets slower, it tries harder and harder to go faster, so it does more work as you load it more.  As you load it more, the power that it is making increases.  This can go on, until the point that you reach the power limit of the motor.  If you exceed the power limit, you will burn out the motor.  You also have to be aware that as you load it more, and thus increase the power, you also increase the amperage being used, and you can also burn out the ESC if you reach it's amp limit before you reach the power/thermal limit of the motor.

     

    So all else being equal, meaning the same ESC, the same battery, and the same prop, the motor with the higher KV will make more power at full throttle.  This is because it is trying to spin the prop faster than the slower motor does, which necessarily means that it is going to use more power.  Therefore, a higher KV motor will make more power with a given prop.  I have also found a tendency where a given motor construction (same manufacturer, same size, but different KV windings) tends to show that higher KV motors also can withstand higher loads, they are rated for more power. I'm not quite sure why this is.

     

    So it would seem like the obvious answer is to use a motor with higher KV.  They make more power with a given prop, and they can withstand more load/power.  This is true if your goal was power/weight.

     

    However, if your goal is efficiency, then it is more efficient to turn the prop slower.  That is, thrust/watt.

This reply was deleted.

Activity

DIY Robocars via Twitter
Sunday
DIY Robocars via Twitter
May 14
DIY Robocars via Twitter
May 13
DIY Robocars via Twitter
RT @f1tenth: Say hi to our newest #F1TENTH creation for @ieee_ras_icra next week in Philly. It’s going to be huge! 😎 🔥 @AutowareFdn @PennEn…
May 13
DIY Robocars via Twitter
May 11
DIY Robocars via Twitter
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Noticed my car zigzagged in last run. It turned out to be the grass stuck in the wheel and made the odometry less accura…
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Test my car. RTK GPS worked great. Thanks @emlid for their support. https://t.co/EkQ6qmjmWR
May 8
DIY Drones via Twitter
RT @chr1sa: @kane That's @diydrones circa 2009. Still have a box of those Canon cameras that we used to strap into planes, just like this.…
May 3
DIY Robocars via Twitter
RT @chr1sa: Our next @diyrobocars race is going to be outside at a real RC racetrack in Fremont on May 28. Fully autonomous racing, head-to…
Apr 30
DIY Robocars via Twitter
RT @f1tenth: Our Spring 2022 F1TENTH course @PennEngineers is coming to an end with a head-to-head race as a big finale. So proud of our st…
Apr 26
DIY Robocars via Twitter
RT @DanielChiaJH: I wrote a thing! Throughout the development of my @diyrobocars car I've been using @foxglovedev Studio to visualize and d…
Apr 23
DIY Robocars via Twitter
RT @SmallpixelCar: My new car for high speed. Low body, everything ( @NVIDIAEmbedded Jetson Xavier NX, @emlid RTK GPS, IMC) under the deck…
Apr 23
DIY Robocars via Twitter
Apr 21
DIY Robocars via Twitter
RT @f1tenth: F1TENTH Race training setup @PennEngineers for our upcoming ICRA2022 @ieee_ras_icra competition. @OpenRoboticsOrg @IndyAChalle…
Apr 21
DIY Robocars via Twitter
RT @fatcatFABLAB: Proud to be hosting a restarted DIY Robocars NYC Meetup April 26. Come by if you want to talk about and race self-driving…
Apr 17
More…