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#2
 
02-09-2008, 10:56 PM
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| That depends on your application and requirements----- you can use a regular dc pm motor that draws low current with no load and runs at about 3k rpm at no load. Dc servo motors most of the time have a twisted armature so that changes from pole to pole are less noticeable. A good way to test a motor if it will make a decent servo is to short the leads and spin the motor by hand, if you feel magnetic cogging then it will not make a good servo but if the motor rotation just becomes stiff in a uniform fashion that will make a good servo.
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