Thread: Help! how to find motor rpms
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Old Apr 17, 2009, 02:25 PM
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So, you drove it at 600rpm (with a hand drill, maybe?) and measured exactly 5v across the motor's terminals?
Then that says its free running (no load) speed should be 600/5 x 12 = 1440 rpm... but that is REALLY slow... unless the motor was designed to run on, say, 110vDC (like a treadmill motor).
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