Re: help. Kostov problem

[Steve Downing <s.downing@elec.canterbury.ac.nz>]

At 11:54 PM 7/31/02 -0700, you wrote:
>.I first though its a bearing but
>today when I take the motor out every thing looks fine . when I spin the
>motor over by hand It turns real nice no noise or grabbing . I hook a 12v
>battery to it and it truns veary slow and shacks like its fighting its self
>. As soon as I remove the wire it smothes out . connect it and it starts to
>shake. the armiture looks ok ,I don't realy know what I'm looking for .

I hope I'm wrong, but from the sound of the symptoms I would say that
you have some shorted coils in the armature.

It may only be that the brush springs have been too hot and are no longer
pushing down hard enough. This is usually accompanied with a ticking or
an pulsating sound.

Look for signs of arcing on only a couple of commutator bars about 45 deg
apart.

Does the motor smell OK or does it have a burnt smell?

Regards Steve