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ram

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Reply with quote  #1 
High axial vibration in motor running at 1500 rpm driving compressor at 500 rpm. Motor both axial vibration is almost same. Whose peaks is at 3x and it harmonics. Bearing fault frequency is also nearly 4650.what will be the problem.
John from PA

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Reply with quote  #2 
Motor 1500 RPM, synchronous or induction? HP? Gearbox single or double helical? Is the ratio exactly 3:1 based on your 1500 RM down to 500 RPM? Tooth combination? Coupling types?
ram

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Reply with quote  #3 
It is a 120 kw induction motor driving reciprocating compressor through belt drive
John from PA

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Quote:
Originally Posted by ram
It is a 120 kw induction motor driving reciprocating compressor through belt drive


Thanks for sharing that info!

First thing I would be asking is how is the belt alignment.
Shurafa

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Reply with quote  #5 
Can you share some plots (e.g. spectra)?

When you mentioned 3x, are you referring to motor speed or compressor speed?

If I were you, I would measure the spectrum using a high resolution set up. Also, I'll collect data over a long enough time to confirm the stability of the signal.

Regards- Ali M. Al-Shurafa
ram

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Reply with quote  #6 
It is 3x of motor speed. Motor both sides axial vibrations are high and same. Nde all bearing bpfo also closer to 3x of motor rpm
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