Are you saying a single phase motor can be driven with 2 phase? How would that be done and how would you control speed with such an arrangement?
>________________________________ > From: Jon Elson <el...@pico-systems.com> >To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> >Sent: Wednesday, March 7, 2012 12:38 PM >Subject: Re: [Emc-users] IRAMS Plan, FAN7382 with BUZ11 > >charles green wrote: >> so the motor in, say, a small drill press or a _bench grinder_ is probably >> of the resistive start winding type? >> >Yes, generally. Some of these may be capacitor-start, however. If it >has a big rounded lump >on the side of the motor, then it is cap start. >> it would be nice to turn the rpms on a bench grinder way down for final >> figuring of certain cutter edges, to reduce removal rate, reduce heat at the >> cutter edge, and reduce innaccuracy from vibrations. >> >Well, get a 3-phase grinder and a VFD. With the stock single-phase >motor, it can be done, >but is very difficult. There are 2-phase VFDs, or you could use a Scott >Tee to convert the >3-phase to 90 degree 2-phase. >> brushed ac motors are easy to turn up and down, but have a large defect of >> set point compliance with any loading, especially at lower rpms. (..and >> they are noisy.) >> >Yes, you can use a closed-loop speed control, or convert the motor from >series to >shunt with a controller. > >Jon > >------------------------------------------------------------------------------ >Virtualization & Cloud Management Using Capacity Planning >Cloud computing makes use of virtualization - but cloud computing >also focuses on allowing computing to be delivered as a service. >http://www.accelacomm.com/jaw/sfnl/114/51521223/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
