It has 4 poles printed on the nameplate. Sent from my iPhone
> On Mar 21, 2019, at 6:15 PM, Forrest Christian (List Account) > <[email protected]> wrote: > > What is the nameplate RPM and Hertz on this motor? > > Assuming a 4 pole motor, you'll have (frequency*120)/poles = RPM > > So if you have a 4 pole motor running at 10Hz, you'll find that it runs at > 10*120/4 = 300 RPM After the 15:1 gearbox, you'd have 20 RPM at 10 Hz. > > It's linear so 2 RPM per HZ. So at 5 Hz you should get 10RPM. So you've > got something off. > > Let's assume that you are just wrong with the poles. 26 RPM * 15 = 390RPM. > Then, (10*120)/poles = 390. 1200/poles=390. Looks like it might > be a 3 pole motor. > > Back the other way: > > 3 Pole Motor @ 10 hz = 10*120/3 = 400 rpm / 15:1 = 26.666 RPM. That's in > the right range. > > Would 26.666RPM be in the range of your measurement/VFD accuracy? > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
