Q2. a) A three-phase 415 V, 4-pole, 50 Hz, A-connected induction motor was tested. The obtained results are: (i) (ii) No load test 50 Hz: Blocked rotor test, 10 Hz: DC test: Vnl=415 V, Pnl=1200 W, In=11 A Vbr 10 V, Pbr=1500 W, Ibr=91 A VDC 3 V, IDC=107 A Draw the per-phase equivalent electrical circuit of the motor Draw the circuits for no-load and block-rotor tests and indicate the slip for each of the tests. (iii) Identify the motor parameters (iv) Calculate the motor's starting torque at the rated voltage.

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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Q2. a)
A three-phase 415 V, 4-pole, 50 Hz, A-connected induction motor was
tested. The obtained results are:
(i)
(ii)
No load test 50 Hz:
Blocked rotor test, 10 Hz:
DC test:
Vnl=415 V, Pnl=1200 W, In=11 A
Vbr 10 V, Pbr=1500 W, Ibr=91 A
VDC 3 V, IDC=107 A
Draw the per-phase equivalent electrical circuit of the motor
Draw the circuits for no-load and block-rotor tests and indicate the slip
for each of the tests.
(iii) Identify the motor parameters
(iv) Calculate the motor's starting torque at the rated voltage.
Transcribed Image Text:Q2. a) A three-phase 415 V, 4-pole, 50 Hz, A-connected induction motor was tested. The obtained results are: (i) (ii) No load test 50 Hz: Blocked rotor test, 10 Hz: DC test: Vnl=415 V, Pnl=1200 W, In=11 A Vbr 10 V, Pbr=1500 W, Ibr=91 A VDC 3 V, IDC=107 A Draw the per-phase equivalent electrical circuit of the motor Draw the circuits for no-load and block-rotor tests and indicate the slip for each of the tests. (iii) Identify the motor parameters (iv) Calculate the motor's starting torque at the rated voltage.
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