Rolling bearings in electric motors and generators
Rolling bearings in electric motors and generators
Rolling bearings in electric motors and generators
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www.bergab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 223-3071<br />
7 SKF solutions<br />
Condition monitor<strong>in</strong>g<br />
Condition monitor<strong>in</strong>g<br />
Vibration Pen plus<br />
The aim of us<strong>in</strong>g a condition monitor<strong>in</strong>g<br />
system is to measure the condition<br />
of “wear” components <strong>and</strong> other functions<br />
that <strong>in</strong>fluence mach<strong>in</strong>e reliability.<br />
The advantage of condition monitor<strong>in</strong>g<br />
us<strong>in</strong>g vibration analysis is that it acts<br />
as an early warn<strong>in</strong>g system. Consequently,<br />
this means that there is sufficient<br />
time for corrective actions <strong>and</strong><br />
bear<strong>in</strong>g replacement can be well<br />
planned (➔ diagram 1 ).<br />
Examples of components <strong>and</strong> systems<br />
that can be monitored are:<br />
• <strong>bear<strong>in</strong>gs</strong><br />
• belt drives<br />
• gearboxes<br />
• <strong>electric</strong> <strong>motors</strong><br />
Some components, such as seals, can<br />
not be monitored, but need manual<br />
<strong>in</strong>spection.<br />
Multi-parameter monitor<strong>in</strong>g<br />
Jo<strong>in</strong>tly developed by SKF Condition<br />
Monitor<strong>in</strong>g <strong>and</strong> the SKF Eng<strong>in</strong>eer<strong>in</strong>g<br />
<strong>and</strong> Research Centre <strong>in</strong> the Netherl<strong>and</strong>s,<br />
multi-parameter monitor<strong>in</strong>g is<br />
the most comprehensive, reliable <strong>and</strong><br />
accurate approach to mach<strong>in</strong>ery<br />
monitor<strong>in</strong>g <strong>and</strong> analysis. Collect<strong>in</strong>g<br />
<strong>and</strong> analys<strong>in</strong>g multiple measurement<br />
parameters greatly <strong>in</strong>creases the capability<br />
to accurately <strong>and</strong> readily identify<br />
bear<strong>in</strong>g damage <strong>and</strong> other mach<strong>in</strong>ery<br />
problems.<br />
By measur<strong>in</strong>g a number of mach<strong>in</strong>ery<br />
related parameters such as acceleration,<br />
velocity <strong>and</strong> displacement <strong>and</strong><br />
process parameters such as speed,<br />
temperature, current, pressure <strong>and</strong><br />
flow, users ga<strong>in</strong> <strong>in</strong>sight <strong>in</strong>to a specific<br />
mach<strong>in</strong>e’s condition. Advanced analysis<br />
techniques such as Acceleration<br />
Envelop<strong>in</strong>g enable analysts to take<br />
the guesswork out of ma<strong>in</strong>tenance<br />
by supply<strong>in</strong>g the required <strong>in</strong>formation<br />
needed <strong>in</strong> order to take the necessary<br />
measures prevent<strong>in</strong>g unscheduled<br />
downtime.<br />
Vibration<br />
Traditional low frequency vibration<br />
monitor<strong>in</strong>g rema<strong>in</strong>s essential <strong>in</strong> identify<strong>in</strong>g<br />
problematic mach<strong>in</strong>ery conditions.<br />
Generally, malfunctions that cause vibration<br />
<strong>and</strong> loss of mach<strong>in</strong>e efficiency<br />
ultimately result <strong>in</strong> damage to the<br />
mach<strong>in</strong>e or its components. While low<br />
frequency vibration analysis can be an<br />
effective <strong>in</strong>dicator of bear<strong>in</strong>g damage,<br />
it may not be the most timely.<br />
Vibration, noise<br />
Diagram<br />
1<br />
7<br />
prewarn<strong>in</strong>g time<br />
bear<strong>in</strong>g failure<br />
detection by SKF<br />
condition monitor<strong>in</strong>g<br />
depend<strong>in</strong>g on<br />
the background<br />
noise the<br />
prewarn<strong>in</strong>g time<br />
can vary<br />
!<br />
detection by<br />
“listen <strong>and</strong> feel”<br />
<strong>in</strong>itial damage<br />
! !<br />
detection by traditional low<br />
frequency vibration monitor<strong>in</strong>g<br />
The advantage<br />
of condition<br />
monitor<strong>in</strong>g<br />
time<br />
www.bergab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 223-3071<br />
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