I have a asynchronous motor with following parameters: f=50Hz; P=180W; U=230/380 V; I=0.99/0.57 A; n=1350 rpm;
Now I want to calculate different parameters as: Io; R1; R2; Lm; L1t; L2t. I need these parameters to build mathematical model for my asynchronous motor. Could you give me idea?

 

Ba Phong:

The parameters you are seeking are not available from the data you show.

However, they can be obtained from two factory tests: the open-circuit or noload test, and the blocked-rotor or short-circuit test.

Alternatively, you can ask motor vendors to furnish per-unit data which are normalized values of motor characteristics. An IEEE paper in the 70's did provide such data for various horsepower & speed motors. I will try to find it.

Regarding the data you list. Are you sure about:
1) the rated phase-current values, 0.99/0.57 Amperes, do not match the rated output, 180 kW?
2) the rated terminal voltage values, 230/380 volts, are not related by sqrt(3)?
3) the rated speed, 1,350 rpm, indicates a slip of 10% slip, which is well above the norm?

Regards,
Phil Corso, PE
Boca Raton, FL
[[email protected]] ([email protected]) {[email protected]}

 

Dao Ba Phong.

I found the paper. My recollection of the date was wrong:

"Protection of Induction Motors Against Unbalanced Voltages"

IEEE Transactions on Industry Applications.
Vol. IA-21, No. 4, May/June, 1985.

Authors: Paul R. Cummings, John R. Dunki-Jacobs, Robert H. Kerr.

Complete ID #: 0093-9994/85/0500-0793$01.00

Regards,
Phil Corso, PE
Boca Raton, FL
[[email protected]] ([email protected]) {[email protected]}

 

Dao Ba Phong.

I found the paper. My recollection of the date was wrong:

"Protection of Induction Motors Against Unbalanced Voltages"

IEEE Transactions on Industry Applications. Vol. IA-21, No. 4, May/June, 1985.

Authors: Paul R. Cummings, John R. Dunki-Jacobs, Robert H. Kerr.
Complete ID #: 0093-9994/85/0500-0793$01.00

Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}