Modern PM motors using Neo magnets are less prone to weakening upon disassembly.
Wound field motors care even less about being disassembled. N. Christopher Perry 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 > -- > "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> > This dungeon is owned and operated by Frobozz Magic Co., Ltd. > 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 ------------------------------------------------------------------------------ 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
