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Brushless AC servo motors  and  stepper motors  have long life spans, which are largely due to the lack of wearing components.  Unlike brush type motors, other than the bearings, brushless AC servo motors and stepper motors have no wearing components.  Additionally you do not have conductive brush dust, which, as it collects on the commutator, may short the armature. 

Who created the stepping motor, or at least the industrial 1.8° motor we know today? The two relevant companies involved with the design were Superior Electric and Sigma Instruments. Although Superior Electric has the leading edge as being the first, it appears that Sigma Instruments may have been the true innovator.

There is a lot of discussion about the 1.8 degree step angle versus 0.9 degree step angle of industrial hybrid stepper motors.  Most stepper motors today have the standard step angle of 1.8 degrees, resulting in a 200 step per revolution.   However, in the early days of stepper motors, before microstepping, low end resonance played a significant role in many applications.

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