Motor bearing temperatures
Motor bearing temperatures
(OP)
Hello to all. On site we have a 6.3kV motor with Drive end bearing D625-6322-C3. On this bearing we experience temperatures to 61 oC. Is this normal wroking temperature? The protection relay of the motor trips at 70 oC. I think this is a little bit more sensitve than usuall. In other applications we have motor tripping at 90-100 oC temperature of bearings. Can you help on this? Also i want to ask how can i understand the type of baring from the part number.





RE: Motor bearing temperatures
Translation can be done using the manufacturer's cataloge. In your case, it seems to be a DGBB (63xx and 62xx are DGBBs) with a 110 mm shaft diameter (the yy22 tells shaft diameter if you multiply with 5). Tolerance is C3, which is a normal tolerance.
The D625 is something that I cannot say off the top of my head. See manufacturer's catalog.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Motor bearing temperatures
I agree 70C sounds ridiculously low for a trip. Particularly if you're measuring the outer ring temperature, but also even if it were a housing temperature. Unless there were some very unique considerations or experience associated with this motor.
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RE: Motor bearing temperatures
Welcome back, Pete!
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...