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
