temporarily tilting vertical motor on its side prior to installation
temporarily tilting vertical motor on its side prior to installation
(OP)
We have a motor located at a hard-to-reach location in the plant. When replacing the motor, we will have to temporarily maneuver the new motor horizontally to get past obstacles prior to final installation in upright position. The old motor (not as critical, but still important) will also have to be maneuvered horizontally for removal.
Motor information: 300hp, 460vac vertical motor with GREASED upper and lower bearings.
Bearings for new motor: 6318 upper and back-to-back 70BZ03 / 70BT03 lower. I think it has approx 30 mils endplay (the internal clearance of split inner ring 70BZ03).
Bearings for Outgoing motor: 6322 lower, 90BT03 upper. I think it is adjusted for 5 – 10 mils endplay.
QUESTION 1 – Is it acceptable to tilt the motor?
QUESTION 2 – How much care is required when tilting the motor to avoid damage?
QUESTION 3 – Is it required to block the shaft when tilting the motor.
Motor information: 300hp, 460vac vertical motor with GREASED upper and lower bearings.
Bearings for new motor: 6318 upper and back-to-back 70BZ03 / 70BT03 lower. I think it has approx 30 mils endplay (the internal clearance of split inner ring 70BZ03).
Bearings for Outgoing motor: 6322 lower, 90BT03 upper. I think it is adjusted for 5 – 10 mils endplay.
QUESTION 1 – Is it acceptable to tilt the motor?
QUESTION 2 – How much care is required when tilting the motor to avoid damage?
QUESTION 3 – Is it required to block the shaft when tilting the motor.
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(2B)+(2B)' ?





RE: temporarily tilting vertical motor on its side prior to installation
Bearings for new motor: 6318 upper and back-to-back 70BZ03 / 70BT03 lower. I think it has approx 30 mils endplay (the internal clearance of split inner ring 70BZ03).
Bearings for Outgoing motor: 6322 lower, 90BT03 upper. I think it is adjusted for 5 – 10 mils endplay.
should have been:
Bearings for new motor: 6318 lower and back-to-back 70BZ03 / 70BT03 upper. I think it has approx 30 mils endplay (the internal clearance of split inner ring 70BZ03).
Bearings for Outgoing motor: 3222 lower, 90BC03 (6318) upper. I think it is adjusted for 5 – 10 mils endplay.
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(2B)+(2B)' ?
RE: temporarily tilting vertical motor on its side prior to installation
RE: temporarily tilting vertical motor on its side prior to installation
I can't see any problems other than potential bearing dings from rattling around within the endplay if handled roughly. I can't imagine the rotor contacting stator. I'm inclined toward allowing to carefully tilt only with rotor blocked.
Can anyone see any problems with this approach?
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(2B)+(2B)' ?
RE: temporarily tilting vertical motor on its side prior to installation
Bill
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"Why not the best?"
Jimmy Carter
RE: temporarily tilting vertical motor on its side prior to installation
Not sure how all that works - but tipping it might drain it or cause all the oil to pool in one area.
Maybe a "rest period" after movement is in order?? Like moving a refrigerator. If you tip it on its side - you are supposed to place it upright for 24 hours before power up??!!
RE: temporarily tilting vertical motor on its side prior to installation
RE: temporarily tilting vertical motor on its side prior to installation
QUESTION 1 – Is it acceptable to tilt the motor?
Yes. It's a "greased" ball bearing motor, hence it's mechanical attributes hold fast. (If it were oil lubricated, additional precautions would be necessary such as replenishing any lost oil as a result of the equipment being tilted.)
QUESTION 2 – How much care is required when tilting the motor to avoid damage?
Many times electrical connection boxes fastened to a motor are in the way, and may have to be removed. So, protecting the exposed leads is always important. Utilizing straps, as opposed to chains in hanging on to the motor during the rigging process is also helpful.
QUESTION 3 – Is it required to block the shaft when tilting the motor?
Again, with it being a "greased" ball bearing motor, movement of the shaft during its installation is not a factor... UNLESS it's a thrust type bearing using oil to be lubricated.
RE: temporarily tilting vertical motor on its side prior to installation
More to the point, drain any oil before it gets somewhere it shouldn't like all over the windings!
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If we learn from our mistakes I'm getting a great education!
RE: temporarily tilting vertical motor on its side prior to installation
The grease is (by definition) sticky and injected into the bearing cavity and between the bearing covers (not gravity fed, nor with a oil reservoir or liquid storage for the oil), so its not likely to cause problems - particularly not when going from a vertical (running and stopped position) into a horizontal on-crane position.
Same is true for lifting it when sideways: don't go upside down, but clamping the rotor, then turning a vertical shaft motor 90 degrees sideways will be only a "rigging" problem, not a motor problem.
RE: temporarily tilting vertical motor on its side prior to installation
Although not at all a E/motors expert,but rather a novice.
In case the greasing is properly stuffed up and voids/air pockets etc. and thoroughly sealed greased enclosures.
There should not any serious envisage-able problems
Hope prove helpful!
Best Regards
Qalander(Chem)