stange brush problem
stange brush problem
(OP)
I have a problem at work that was wondering if anyone else has encounters before. The 400A DC motors that we use at work seem to consistantly blow the tags off the brushes at the point where they enter the brush. This occurs far to early in he brushes life for to be normal and the manuafacturers of the brush say they are correct for the motor.
The Connecting tags then arc out on the motor frame with obvious consequences any ideas?
The Connecting tags then arc out on the motor frame with obvious consequences any ideas?





RE: stange brush problem
If that is the case, the problem is "manufacturer quality" of the connection point. Some manufacturers have better electric connection procedures than others. Poor connection means high resistance and for high current (>100 amps) the heat generated destroys the joint, triggering a potential catastrophic failure. We have almost eliminated that problem replacing those problematic brushes with equivalente grades manufactured by “National". Make emphasis to the technical advisor on the connection problem for the shunt wires.
RE: stange brush problem
I think you ought to approach another brush manufacturer.
RE: stange brush problem
Theoretically, a 4-pole 4-brushholder motor should have an individual motor overload relay for each brushholder. If 1 brushholder fails the other brushholder(s) will register excessive current.
The application for this motor was for an elevator at the end of a paperboard corrugating line. There was no excessive vibration or other problem to speak of. Could have been sabotage given that later on I was falsely accused of taking a bath or shower once a week and of changing my underwear once a week. Amazing how much people can malfunction while under the influence of greed.
RE: stange brush problem
I have encountered quite a few instances of a 120 volt outddor light fixture that has stopped working and all I have to do is to take apart the wire connections, get rid of the copper oxide, and put it back together. There is a reason why there are 2 antioxidant compounds of the market that have copper particles in them.
RE: stange brush problem
Maybe the brush holder itself isnt carrying enough current, and all the current to the brush is therefore being carried by the tail...thus overheating the cable.
just a thought..
Jeff
www.motors-direct.co.uk
RE: stange brush problem
RE: stange brush problem
RE: stange brush problem