You have a special motor. But I think you mentioned that before. Siemens and others make motors like that specifically for spindle applications. A typical AC induction motor won't do that as they won't hold enough residual magnetism.
Dave On 1/25/2016 8:00 AM, Marius Alksnys wrote: > 01/24/2016 11:55 PM, Gene Heskett rašė: >> On Sunday 24 January 2016 16:30:45 Marius Alksnys wrote: >> >>> 01/24/2016 04:37 PM, Dave Cole rašė: >>>> Is the positioning ability adequate? >>> I am impressed how strong it holds in position even when fed with DC >>> current (freq = 0). I can't force it to rotate by hand, while it is >>> very easy rotating while turned off. >> That motors rotor has to be offcenter enough to drag under dc exitation, >> whereas it should move like it was full of cold molasses. Call a >> surveyer slow, but dead smooth. >> >> As that raises the spot heat from friction at low speeds, I'd want to >> have a spare on the shelf in case it self destructs. > Sorry Gene, it is hard for me understand almost all of your posts > without dictionary and deeper analysis of your words.. It might be > because my mother language is Lithuanian, my English technical is ~ ok, > but your posts are full of colorful English.. :) > > This spindle rotates at 10kRPM nicely, thus I have no doubts it is in > good balance. I think heavy magnetic field holds the magnetized rotor > almost in place when I turn 10A DC current on. > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
