forums.noria.com Message Boards Alignment/Balancing/Vibration vibration of a motor|
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Bronze Member - 1 or more posts |
One Oxygen compressor motor vibration is increasing along with the time & getting tripped at 100 micron. When we are starting the motor vibration is very less around 10 micron but with the time Drive End side Vertical vibration as well as NDE side horizontal vibration is getting increased. I have taken spectrum
Drive end side at Horizontal direction 1X, 2X, 3X, 4X available & same for Vertical direction also only amplitude is high for Vertical. Non Drive end side Vertical direction upto 4X available & Horizontal direction only 1X. Ihave checked probable looseness factor but could not found any abnormality. Blue matching checked for the Journal bearing with shaft as well as with the bearing housing. Interference / clearance checked for the bearing with the bearing housing. It is OK. Can anybody help me? |
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Bronze Member - 1 or more posts |
Is your motor coupled to the compressor? Also, can you run the motor uncoupled to make sure you are not seeing something from the compressor as it heats up.
Also, what kind of compressor (piston, centrifical, etc.) Lance Foreman Mechanical Analysis & Consulting, Inc. |
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Bronze Member - 1 or more posts |
Resonance may be the cause of Vibration. Please check for the same by varying the speed if possible, The vibrations should reduce at certain speed if resonance is the cause.
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Bronze Member - 1 or more posts |
No motor is not coupled with compressor. We are trying to solve the problem of the motor only. Compressor does not have any problem. It is a centrifugal compressor main thing is it in decoupled condition. please help. |
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Bronze Member - 1 or more posts |
Janardhana may have point since motors have critical speeds. The structure might have responded to such speed that might have triggered its natural frequency.
By the way, is the motor AC Induction or Synchronous or DC? cheers!!! |
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Bronze Member - 1 or more posts |
I have similar experience with a 938 KW new motor (3000 rpm) driving a centrifugal compressor. Motor Vibration (at brg housing) as well as bearing temp (bath lubricated Journal brgs) increases over time. It starts with 1.5 mm/s at Motor drive end vertical & reaches 4 mm/s in 10 hrs, similarly next higher level is non drive end horizontal (from 0.9 to 2.5 mm/s). Is it a case of thermal bow??? Spectrum shows mainly 1X. Pl share your opinion.
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forums.noria.com Message Boards Alignment/Balancing/Vibration vibration of a motor
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