2004-02-20 08:16:24 UTC
the Czech Republic that manufacture DC electric motors (~180 HP).
We've been having a problem where the loops of the armature are
destroying the resin wrapping that is supposed to hold them down. The
centrifugal force of the loops is just tearing this wrapping apart
after the motor has been in service for awhile. Usually the loops
flare out enough that they contact the field windings and then the
motor is toast.
We've determined that the wrapping process is a very low quality. It
is almost the consistency of cardboard rather than a very hard
material like it should be. The proper fix for these motors should be
to rewrap both ends in the proper manner and then the centrifugal
force won't tear it apart.
The manufacturer wants to install a CAP over and around the entire
looped end of the armature! I've been able to determine so far that
this cap will probably seriously restrict air flow and cooling. I
also believe that the cap is just going to tear itself apart
My question to the group is what other reasons is this a bad idea?
Also, have any of you seen this capping method used elsewhere? I
can't find anyone I know that's ever heard of such a thing. The funny
thing is that this method is coming from a fairly well known company
in CZ... You can probably think of it.. Thanks.