Dear Sirs, there are different systems of motor on-line diagnostic (ALL-Test, Empath, Explorer etc.)

It is very interesting to compare results of diagnostic for the same motor.

You can download voltages and currents data (absolute Volts and Amperes, 10 kHz sampling
frequency, 1'45'' duration of signals) at http://rapidshare.com/files/93969099/Motor_EF-6.zip.html

Motor data
P nom=15 kW N nom=1450 rpm I nom=29.2 A It's a fan
Bearings of motor: 1. Dinner =45 mm, Douter=100 mm, D balls=16.46 mm N balls=8
2. D inner=50 mm, D outer=90 mm, D balls= 12.7 mm N balls=10
Belts(Diam_master/Diam_slave) 200/150 mm, L=2120 mm; N blades of fan=38

Results of our diagnostic is available after e-mail on a.and.alpha<at>gmail.com


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Victor

Hi Victor

Can you explain in some more detail what we will see if we download and unzip the file?

Thanks

OK, there are 6 files in this arhive:

3 phase supplying voltages (Volts) Motor EF-6 Ua.txt, Motor EF-6 Ub.txt Motor EF-6 Uc.txt
and
3 currents (Amperes) Motor EF-6 Ia.txt Motor EF-6 Ib.txt Motor EF-6 Ic.txt.

It is real data from real motor (not model), values in those files obtained
with ADC with sampling frequence 10 kHz - delta_t=1e-4 sec.)

We faced such a problem that whose data had a different interprettation in analys and conclucions by differnt vendors...

Thanks,

Victor

Dear victor
can u upload those file in normal htmal or other format. i mean i am not able to download zip files from office PC.

thanks

Dear THERMOGRAPHER, what format do you need?
Pleas note, that zipped file is 13.5 MB long and unzipped *.txt files is
53.8 MB (all files)

Victor

dear victor
if possible for you can u upload the file in PDF OR MDI format , i havent access for downloading the zip files.

thanks & regards

OK, if you will send me programs for conversion such a large files.
And I was learned at school that name of every man must be written beginning from capital letter...

Victor

Victor,
This was an interesting execise, but what did I see?
I unzipped your six files (3 voltage, 3 current) and found a table of about 65,000 or more data points per file. Truncating at 10,000 points and pasting into MS-Excel so as to make a chart, I get a somehwat malformed (peaked sawtooth, not a smooth sinusoid) waveform that I suppose is running at line frequency (60Hz ?), and an envelope on that wave of 10Hz and about 5% of the peak amplitude. All three phases look fairly identical.
What is your diagnosis?

Dear Gary, thank you for post.
Not "65000 or more data per file", 10000 (sampling frequency)*105 sec
(duration)=1050000 data points.

Hence, it is clear that truncating data to 10000 points we consider duration of signals to 1 sec (instead of 105 sec.)
For spectral analysis of signals it's necessary to use special software, not MS-Excel, and then we see that line frequency was 49.97
Hz, and every peak on spectrum says us about motor faults (depending the value of peaks)
> All three phases look fairly identical.
In all freqs. range? And what about phase shifts of currents?
> What is your diagnosis?
Please, give your e-mail, we'll send it to you.

Victor