An important spec to look for in any motor is the stall torque to give an idea of its ability to move a dead load like a machine table that also has stiction (stationary friction) and any other load on the table to overcome.
Note power is the product of torque and rpm the formulas are on http://www.engineeringtoolbox.com/electrical-motors-hp-torque-rpm-d_1503.html including some example motor ratings Use a motor man enough for the job This is from a user who is about to rebuild the X slide due to friction problems when static Dave Caroline On Thu, Sep 5, 2013 at 5:40 AM, Gregg Eshelman <g_ala...@yahoo.com> wrote: > On Wed, 9/4/13, Jack Coats <j...@coats.org> wrote: > > Subject: Re: [Emc-users] Servo motor watts VS torque? > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Date: Wednesday, September 4, 2013, 8:18 PM > > >From what I have been told, the > Amps is the 'power', but more volts is the > 'speed' and responsiveness component. > > Watts is Volts times Amps, and is defined as 'power'. > > The 'torque' would be more the 'amps' than power, but > obviously they are related. > > Does that help? > ---------------------- > > What I'm looking for is for each type of motor (AC and BLDC) is "You want at > least x watts and n amps to at least be in the same range as the old motor." > On cncdrives.com I noticed the torque values listed are different for AC and > DC motors of the same watts. > > The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM > 2400. Max voltage 140 DC. > > I don't know how much the table and saddle weigh, but having had the table > and saddle off a slightly smaller Lagun to do long overdue cleaning and nut > replacement, I know it's a rather large number of pounds or kilos. There's > some videos on youtube of old Anilam Crusader M systems on knee mills, > presumably with 140V brush DC motors like these, and they don't appear to be > too sprightly. > > Have a look at this. It's a bed mill, it must have some real powerful motors > to move that fast. http://www.youtube.com/watch?v=E3AqIZURMbI I don't expect > a knee mill to be that fast, but it should be able to be at least somewhat > quicker than it was out the factory door 23 years ago, with newer motors and > control systems. > > ------------------------------------------------------------------------------ > Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! > Discover the easy way to master current and previous Microsoft technologies > and advance your career. Get an incredible 1,500+ hours of step-by-step > tutorial videos with LearnDevNow. Subscribe today and save! > http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
