I would like to know what makes a brushless motor heat up. I'm aware of the problems generating the high temperature such as wire contact problems or overloaded motors. I want to know what makes a normal motor in normal conditions warm up. Is it related to the Joule effect?

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    $\begingroup$ Because copper has resistance and you have current flowing thru it $\endgroup$ – Caterpillaraoz Feb 6 '18 at 9:27
  • $\begingroup$ en.wikipedia.org/wiki/Inductance $\endgroup$ – Ville Niemi Feb 6 '18 at 12:14
  • $\begingroup$ Thanks, Koyovis already answered me perfectly, much appreciate to all of you. $\endgroup$ – Mohamed Bkekria Feb 6 '18 at 13:51
  • $\begingroup$ "Koyovis already answered me perfectly": It may deserve an upvote. $\endgroup$ – mins Feb 6 '18 at 22:49
  • $\begingroup$ as i'm a new member i can't upvote it, i specified it to be what i was looking for, and i hope so you guys stop with this way of communication, i'm here to ask a question and you make it seem like a pathetic idea. just stop with over reacting to everything. $\endgroup$ – Mohamed Bkekria Feb 9 '18 at 13:56

The motor is converting electrical energy in mechanical energy, and unfortunately all energy conversions lose some energy to heat. This site states the cause of the heat losses as:

  • Friction losses due to bearings etc.
  • Windage losses due to air resistance.
  • Iron losses caused by magnetic paths of the motor (hysteresis losses and eddy current losses).
  • Ohmic losses from current flow.
  • Stray losses: other
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