티켓 #5054 (new 해야할 일)

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<br> The present density per unit area of the brushes, together with their resistivity, limits the motor's output. This sparking limits the maximum velocity of the machine, as too-fast sparking will overheat, erode, and even melt the commutator. Sparking also generates ozone, which may accumulate in poorly ventilated buildings. With no commutator, the life of a BLDC motor can be considerably longer in comparison with a brushed DC motor with a commutator. On this utility, utilizing AC energy on a motor designed to run on DC would experience efficiency losses resulting from eddy current heating of their magnetic components, significantly the motor field pole-pieces that, for DC, would have used solid (un-laminated) iron. Current flows by one or more pairs of brushes that contact the commutator