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The name
unipolar is derived from the fact that current flow is
limited to one direction. As such, the switch set of a
unipolar drive is fairly simple and inexpensive. The
drawback to using a unipolar drive however, is it's limited
capability to energize all the windings at any one time. As
a result, the number of amp turns (torque) is reduced by
nearly 40% compared to other driver technologies. Unipolar
drivers are good for applications that operate at relatively
low step rates. |
