[EVDL] Mavins motor´s bearings
I know Victor and others on this list warned about these motors, but
I wanted to check if they are usable, so I bought one last spring.
I disassembled it and found out that the bearings are open ones, ment
to be lubricated by the transmission oil. A minor detail the seller
should mention I think..
http://www.havina.fi/motor.htm
The bearings have extra small inner clearance, propably because of
the high (13 000) rpm of this motor. There are sealed ones available
with almost the same clearance, but their rpm is limited to 8500.
So, my questions:
What type of bearings Siemens (and other AC-) motors normally have? I
suppose there must be sealed ones with 10 000+ rpm available? Ceramic?
Any problems ahead if I replace the originals with those sealed ones,
and keep the rpm under 8500?
As far as I can tell, the tranny/differential oil was ment to run
freely inside the motor, also around the rotor. Is that possible?
What if there is air instead of oil (should the distance between the
rotor and the stator be different etc)?
kyseleepi taas,
Osmo
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
I know Victor and others on this list warned about these motors, but
I wanted to check if they are usable, so I bought one last spring.
I disassembled it and found out that the bearings are open ones, ment
to be lubricated by the transmission oil. A minor detail the seller
should mention I think..
http://www.havina.fi/motor.htm
The bearings have extra small inner clearance, propably because of
the high (13 000) rpm of this motor. There are sealed ones available
with almost the same clearance, but their rpm is limited to 8500.
So, my questions:
What type of bearings Siemens (and other AC-) motors normally have? I
suppose there must be sealed ones with 10 000+ rpm available? Ceramic?
Any problems ahead if I replace the originals with those sealed ones,
and keep the rpm under 8500?
As far as I can tell, the tranny/differential oil was ment to run
freely inside the motor, also around the rotor. Is that possible?
What if there is air instead of oil (should the distance between the
rotor and the stator be different etc)?
kyseleepi taas,
Osmo
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev