About PWM motor testing and time-dependent process

[e573]

Dear Sirs,
Two question, if it's possible.
1. Motor can be supplied or directly through network (380 V), or through the frequency
regulator.

We have not enough experience in latter case, but if we apply directly MCSA approach for this case, the number of faults is relatively low.

Do you have data for the !!same motor (better obtained in one day), which is supplied
a) Directly from power supply 380 V
b) Through PWM regulator

It is very interesting compare results (or model them by
calculations) for those cases.

2. Often we asked to diagnose motor, which during 15 sec 2 times runs, 2
times stops, or diagnose motor during it start (time-dependent process)

What is your opinion about wavelet usage for this purpose?

--
Best regards,
Victor Petoukhov

http://www.motor-diag.com

 

[Skogsgurra]

Sorry, it is very difficult to understand what you are asking.

Do you need data like power, current consumption, power factor etcetera vs speed for one and the same motor where the data has been obtained the same day?

And (2) if using wavelets is a good thing when modelling/analyzing motor behaviour? To the last question, I think they could be used, they are available in many modelling packages and probably good for some applications. Wavelets used to be kind of a buzz-word a decade ago. Never saw any real use for them in motor analysis.

It's a little like fuzzy logic - popular in some quarters, but not much in use.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[e573]

quotation
Sorry, it is very difficult to understand what you are asking.
quotation

Why? And what particularly is difficult to understand?

quotation
Do you need data like power, current consumption, power factor etcetera vs speed for one and the same motor where the data has been obtained the same day?
quotation
No, of cource, no. What we need we pointed out in this thread.

quotation
And (2) if using wavelets is a good thing when modelling/analyzing motor behaviour? To the last question, I think they could be used, they are available in many modelling packages and probably good for some applications. Wavelets used to be kind of a buzz-word a decade ago. Never saw any real use for them in motor analysis.

It's a little like fuzzy logic - popular in some quarters, but not much in use.
quotation

But we use wavelets as fuzzy logic namely for motor diagnostis, and very successfully.