Measure Inductance of three phase motor

[hamadsultan]

Hi fellows;
I have 50 HP motor 2 pole three phase star connected. I have also LCR meter.
How i find or measure the inductance of the motor.
I thin first connect between R and y Phase then Y and B and Then R and B.
then calculate the average. I think i am wrong.
Please guide me the proper methd
Thanking u i will remain
Bye

 

[wassabi]

The procedure detailed here looks solid.
https://www.control.com/thread/1250410776

Connect an LCR on each phase. Start with, say, A-B. Then while slowly turning the rotor one reveloution, in small increments and record the LCR measurement for each increment.

Repeat for B-C, and C-A. Then plot the readings and compare the three sets of data! A pattern will be revealed that can be analyzed!

 

[hamadsultan]

Hi Fellows;
I took the readings with LCR meter as described above. The motor specification as under
siemens motor with two pole 50 HP, 0.89 PF, 2960 RPM, 400 volt, three phase, 50 Hz.
The readings as under
Phase A-B B-C A-c
0 degree 6.14mH 7.38 6.79
90 7.30 6.20 7.11
180 6.22 7.41 6.77
270 7.16 6.16 7.20
All readings in mH.Then i calculate average of each and calculate XL=1/2*PI*Frequency*L
I calculate 0.475 Ohm.
Am i right or wrong?
Thanks
Takecare bye

 

[hamadsultan]

Measurement done at 1 KHz.

 

[FvM]

I don't know why you want to calculate XL, but the calculation is obviously wrong. Consult a text book.

 

[hamadsultan]

Hi
I want to calculate the PF VAR and Va of a three phase motor.