On Friday 03 May 2013 08:14:25 N. Christopher Perry did opine: > Modern PM motors using Neo magnets are less prone to weakening upon > disassembly. > So there is a chance that could be done. The try depends on how symmetrical the assembly seems to be. > Wound field motors care even less about being disassembled. > > N. Christopher Perry
Thanks, food for thought, should it be required. USPS says it is 'in transit'. But I have grass to mow in the meantime. That should keep me out of the bars. :) > On May 3, 2013, at 6:24, Gene Heskett <ghesk...@wdtv.com> wrote: > > On Friday 03 May 2013 06:13:12 Steve Blackmore did opine: > >> On Thu, 2 May 2013 13:47:42 -0400, you wrote: > >>> Some brushed motors I have noted have the brush holders at small > >>> angles that aren't conducive to good brush life when running > >>> backwards, and which may also effect the motors torque when in > >>> reverse. The OEM 400 watters brushes are dead on center. > >> > >> As I said, my motor has the brushes at 90 deg to the armature, but it > >> still runs slower backwards. It's not a skewed armature type, and the > >> reverse relay simply swaps the polarity to the brushes so I'm not > >> sure why. > >> > >>> So, what is the general consensus about running one of these smaller > >>> treadmill motors backwards? (in the event I can actually make it fit > >>> where the old 400 watter was living) > >> > >> As long as it's adequately cooled, cant see it do any harm. > >> > >>> Would a day or so's running at no load & medium speed re-seat the > >>> brushes and improve the brush life in that event? > >> > >> Should do. > >> > >> Steve Blackmore > > > > Good. I just had a thought though Steve. I wonder if the field frame > > might be skewed? If so, its sometimes possible to disassemble it and > > swap the field end for end which should reverse any direction > > favoritism. Or are these things like steppers, where the PM can be > > seriously weakened by removing it from its 'keeper', the stator > > frame? I have read it from several sources that a stepper armature > > will be permanently damaged by pulling it out. So I would assume > > these modern PM field dc motors would be subject to the same > > warnings? > > > >> -- > >> > >> --------------------------------------------------------------------- > >> --- ------ Get 100% visibility into Java/.NET code with AppDynamics > >> Lite It's a free troubleshooting tool designed for production > >> Get down to code-level detail for bottlenecks, with <2% overhead. > >> Download for free and get started troubleshooting in minutes. > >> http://p.sf.net/sfu/appdyn_d2d_ap2 > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Cheers, Gene > > ------------------------------------------------------------------------ > ------ Get 100% visibility into Java/.NET code with AppDynamics Lite > It's a free troubleshooting tool designed for production > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://p.sf.net/sfu/appdyn_d2d_ap2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Diplomacy is the art of saying "nice doggy" until you can find a rock. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite It's a free troubleshooting tool designed for production Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
