What are the causes of armature heating?

Armature heating in electrical machines is primarily caused by copper losses due to the resistance of the windings when current flows through them. Additional factors include iron losses from hysteresis and eddy currents in the magnetic core, which increase with frequency and magnetic flux density. Excessive load, poor ventilation, and inadequate cooling systems can further exacerbate heating. Lastly, short circuits or faults within the armature can lead to localized overheating.