Quote:
Originally Posted by Daox
If you spin a series wound motor it doens't generate any power (and thus no drag) until you power the field windings and connect the armature wiring to a load. All you have is bearing and brush drag, and some windage lossses which is all pretty minimal.
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True. You can see what that is pretty easily by putting a wheel or crank on the shaft and spinning it. If it goes easily, drag will be relatively low.