Posted by MarkB_MI on June 30, 2008 at 03:37:42 from (216.234.120.251):
In Reply to: Electrical Question posted by teddy52food on June 29, 2008 at 16:12:13:
Really your question is more mechanical than electrical. You really need to determine what torque is required to overcome the static friction of your bearings. Once you do that, it becomes a matter of sizing a motor with sufficient torque at zero rpm. Starting torque and operating horsepower (or "wattage", as you say) are pretty much independent of each other; starting torque depends a great deal on the particular type of motor.
Is this a real problem or a theoretical one? If it's theoretical, you can pick bearings that have almost zero static friction, in which case the starting torque would be small. At the other end of the scale, babitt bearing have very high static friction.
If you actually have this device built, you can put a torque wrench on the shaft and measure how much torque it takes to overtake the static friction in the bearings.
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