High Motor bearing temperature
High Motor bearing temperature
(OP)
We experience high Motor bearing temperatures during warmer climate (ambient unto 27 degC). These are sleeve bearing motors oil ring lubricated along with lube mist. The Alarm/Trip are 90/100 DegC and the bearing temperatures reach up to Alarm limits.The bearings were inspected on a couple of motors and found no damage.
Any similar experience to anybody?
Any similar experience to anybody?





RE: High Motor bearing temperature
I.e., what changed?
Mike Halloran
Pembroke Pines, FL, USA
RE: High Motor bearing temperature
Your ambient temperature is not particularly hot.
It would be worthwhile to review the viscosity of the lubricant you're using. (Higher than necessary can make bearing run too hot), but can't be so low as to lose oil film. Can you provide shaft journal diameter, bearing length, shaft speed (rpm) and type of oil (viscosity and preferably viscosity index), approximate weight of rotor, and what is connected to the motor (what type of load and are there gears or just coupling).
Are you able to see the oil ring with the machine running to verify it is spinning and delivering a good quantity of oil?
When bearings were inspected did they show signs of misalignment? (angle wear pattern within the bearing).
How about dry-roll/blue check of bearing to verify no unusual geometry?
Was bearing clearance checked? (too tight can make machine run hot).
Any unusual sludge in the reservoir?
Outside of bearing housing external - any unusual fouling?
Had the behavior of the beairngs changed since installation or they have always run this hot?
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(2B)+(2B)' ?
RE: High Motor bearing temperature
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(2B)+(2B)' ?
RE: High Motor bearing temperature
The oil viscosity is VG32. The purge mist is in place to keep the moisture ingression away.
The bearings were opened on a couple of motors, as recommended by Electrical folks to look for
damaged bearings and low clearance. The bearings were clean and clearances were within the limits.
The oil ring is not visible from outside.The motor is directly coupled to pumps.
This happens on many sleeve bearing motors.
when the machine is stopped, the temperatures returned to ambient. This happens during
the summer weather.
RE: High Motor bearing temperature
Bill
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"Why not the best?"
Jimmy Carter
RE: High Motor bearing temperature
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(2B)+(2B)' ?
RE: High Motor bearing temperature
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(2B)+(2B)' ?