bench grinder motor burns when shaft is vertical
bench grinder motor burns when shaft is vertical
(OP)
i am building a machine witch has a bench grinder motor mounted verticly because its most practical for the apllication. the first motor ran and smoked and died. it was replaced the new motor makes noise and starts to burn i shut it off. i then put it on the bench it ran fine i picked it up while running and held it verticly it made noise and started to stink like a burning motor it is ac brushless if that matters the smoke and smell seem to come from a wond coil device mounted near the on off switch. i took the old one apart because it was the same one to see the configuration and found no machanical damage. im still scratching my head any one have any idea whats going on thanks





RE: bench grinder motor burns when shaft is vertical
Is there a lot of end play in the shaft?
respectfully
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
You might be able to adapt the grinders you've been buying; just don't run them with the shaft vertical until you've got a thrust bearing in there somewhere.
Mike Halloran
Pembroke Pines, FL, USA
RE: bench grinder motor burns when shaft is vertical
If the lamination gets too far out of position it could prevent the starting winding cent. switch from operation and causing high current draw on the windings.
RE: bench grinder motor burns when shaft is vertical
There are couple of diferent possibilites. I would assume all of them will revolve around there being a mechanical prob with the motor, eventually causing an electrical prob.
RE: bench grinder motor burns when shaft is vertical
how long did the motor run before these symptoms were observed?
is there an air flowpath that you blocked when you turned the motor vertical?
how much does the shaft move axially under the weight when turned from horizontal to vertical?
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RE: bench grinder motor burns when shaft is vertical
respectfully
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: bench grinder motor burns when shaft is vertical
If so, you need to trade up. Better bearings, better ventilation, more copper, continuous duty, etc.
Mike Halloran
Pembroke Pines, FL, USA
RE: bench grinder motor burns when shaft is vertical
respectfully
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
Could you possibly post photos of your motor in horizonatl and vertical positions here ? That could give us some clues.
Keith has posted the following useful faq on how to post photos in this forum.
FAQ238-1161
*Nothing exists except atoms and empty space; everything else is just an opinion*
RE: bench grinder motor burns when shaft is vertical
This will have an effect on the motor, and the current it draws. As for an electrical explantaion, and or equation, i will need to leave that up to the engineers of the forum.
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
RE: bench grinder motor burns when shaft is vertical
A LPS for you.
*Nothing exists except atoms and empty space; everything else is just an opinion*
RE: bench grinder motor burns when shaft is vertical
respectfully
RE: bench grinder motor burns when shaft is vertical
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com