Motor Temps and Maintenance

Discussion in 'Electronics' started by Josh Lambeth, Jul 6, 2012.

  1. Josh Lambeth

    Josh Lambeth Well-Known Member

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    Hey Guys,
    Just curios about how hot your motors run. Ours run sometimes to the point where you can't touch them more than a few seconds without it burning you. THis is after a 6-7min flight. The outside air temps are hot too though, 100*-110*F. Is this ok or is this a sign of something else we need to look at...

    Also what about motor maintenance? Is there anything special I should be doing to keep the motors in tip-top shape? Thanks guys!

    Josh
     
  2. Tristan Twisselman

    Tristan Twisselman Active Member

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    On my 3d helis I oil my motor bearings usually every time I fly them...so say I fly 5 flights one day, I will drop some oil on each bearing when im done. Oiling every 5-10 flights I think would be plenty, some people dont do anything at all. As far as temps, do you have a temp gun? Anything under 180 and your fine for brushless motors, especially in 100 degree ambient.
     
  3. John Gore

    John Gore Member

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    Odd. My motors are room temp, even after 18min flights (no payload). Have not tried with much payload yet, but it seems they will get a lot hotter with a payload. Hmm. Any answers to the question above, what are the normal / safe motor temps?
     
  4. Gary Haynes

    Gary Haynes Administrator
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    Josh

    Here's some testing results I did with a 5s vs 4s battery. I did take the motor temps but forgot to record them.

    [​IMG]

    If I remember correctly the motor temps were warm to the touch but not to hot to hold. I'm more concerned about the BL temps. Add another 20 degrees F and I don't think I can cary the load with the current setup. (standard MK OctoXL and BL 2.1 controllers, QC motores, APC 14x4.7 props).
     
  5. Josh Lambeth

    Josh Lambeth Well-Known Member

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    Wow Gary! That is not what I was expecting temp wise! I figured you would have slightly lower temps because the current is overall lower... I have had one BL hit 105* C and then quickly landed. Since I have added the alum. coolers the temps are back under control. Thanks for the info!

    Josh
     
  6. Joe Azzarelli

    Joe Azzarelli Active Member

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    Gary

    Just so I am clear, all of your temps are °C ?

    Joe
     
  7. Gary Haynes

    Gary Haynes Administrator
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    Joe you are correct. All metric to be consistent.
     
  8. T.Diaz

    T.Diaz New Member

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    Hi all,
    On the maintenance topic I've had the same questions relevant to the QC motors and necessary maintenance.

    One thing I have noticed is that one of my motors sounds much different then the others and can clearly be heard when I turn off power after each flight. As the props slow to a stop I hear a low pitch ticking noise. Sounds like a hollow metal scratching sound (for lack of a better word)

    Motors on my CS8 are only a couple months old but heard this noise pre 1st flight. Could be a bearing?

    Not sure how to address the sound and if this is systemic to a bigger problem I may have down the road if I don't do anything about it.

    Any input greatly appreciated.

    Thanks!
     
  9. Joe Azzarelli

    Joe Azzarelli Active Member

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    Does anyone from Quadrocopter.us monitor this forum? The proper maintenance of the QC motors is a good question...
     

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