Typically, engineers can choose between direct-current (DC) or alternating-current (AC) motors. Machine Design has covered the difference between basic types of motors in the past.

Differentiating Between DC and AC Motors. Feb. 1, 2007. ... EMF is “the difference in potential that exists between two dissimilar electrodes immersed in the same electrolyte or otherwise connected by ...

According to maxon motors, DC motors are limited by their brush system and have a lifespan of 1000-1500 hours; less than 100 hours if under extreme loads. Some motors may operate to 15,000 hours ...