On Sun, 2009-10-11 at 13:46 -0500, Mark Cason wrote: ... snip > Kirk, > > I have two treadmill motors, 120VDC - 1100 watts, that I had > considered using, but they both have the rotation listed as CCW. I > haven't taken them apart, but I'm assuming they both have angled brushes > that allow them to run in one direction. Are yours the same way?? If > so, how well do they work when turning backwards? ... snip
One set looks like this: http://www.wallacecompany.com/machine_shop/bridgeport/00046-1a.jpg the other looks very similar. The brushes are aligned with a radial through the center of the armature, so in this respect, has no rotational bias. The brush timing might be advanced toward one direction to help with arcing at high speed, but then arcing would increase in the other direction, which I haven't noticed. The only other thing that comes to mind, is that the brushes have some slop, such that the brushes won't wear-in if the motor is used in both directions. I haven't had any issues with my motors so far, even at very low speeds, were one would expect some cogging. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
