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Message No. 9152, Started by indy0t4 on 05/09/02
 What kind of torque do I need for this application? AC synchronous motor that has to spin at 50-60 RPM, mounted horizontally with a plastic disc attached.  The disc is 7" in radius, with a uniform weight of 0.256 lb, and is mounted approx. 0.75" along the shaft.  This motor has to run continuously for 2 years... What starting torque will I need to get this disc moving?  Any help with formulas, or calculations would be greatly appreciated.
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Follow-up Messages (14)
 No. 9836, Posted by nohavecd on 10/09/02, 23:00 PST. If I understand this correctly, once the disk is up to speed, there is no e... No. 9266, Posted by Joe Boggs on 05/28/02, 08:43 PST. When I said 50-60 RPM range, I meant that whatever RPM I end up with, must ... No. 9241, Posted by indy0t4 on 05/22/02, 07:24 PST. In your original message you gave a range of 50 to 60 RPM. That kind of no... No. 9238, Posted by rolschwarz on 05/22/02, 06:01 PST. The reason the motor must be synchronous is that the disc must rotate at a ... No. 9235, Posted by indy0t4 on 05/21/02, 14:21 PST. Is there any particular reason you need to use a synchronous motor? An ind... No. 9234, Posted by rolschwarz on 05/21/02, 13:44 PST. Some other thoughts - You may need to increase your torque required to a... No. 9195, Posted by neil moran on 05/15/02, 12:52 PST. Thanks Neil. But read on... Here's the funny thing: I performed simila... No. 9182, Posted by indy0t4 on 05/13/02, 17:08 PST. Hi Indy0t4, You need to work out the total moment of inertia of the 'sys... No. 9180, Posted by neil moran on 05/13/02, 12:49 PST. ok, so if I understand it correctly you have a washer pushing against the m... No. 9176, Posted by rorschach on 05/13/02, 06:08 PST. Let me give you as much info as I can: There are no other supports for t... No. 9173, Posted by indy0t4 on 05/12/02, 20:39 PST. the sad answer is "need more input". is the disk directly coupled to the mo... No. 9171, Posted by rorschach on 05/12/02, 19:38 PST. The disc is a plastic, polarized disc that creates motion effects. It runs... No. 9159, Posted by indy0t4 on 05/10/02, 08:24 PST. Theoretically, any starting torque greater than zero will get you up to spe... No. 9158, Posted by rolschwarz on 05/10/02, 07:26 PST.