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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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