Steve Blackmore wrote: > 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. > In a motor designed for reversible use, the brushes also need to be exactly centered on the poles of the field magnets. I would guess yours are rotated a bit to compensate for the inductance of the armature windings delaying the reversal of the current as the commutator slugs pass the brushes.
Jon ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
