Example 34.6. A 3-6 induction motor having a star-connected rotor has an induced e.m.f. of 80 volts between slip-rings at standstill on open-circuit. The rotor has a resistance and reactance per phase of 1 2 and 4 2 respectively. Calculate current/phase and power factor when (a) slip-rings are short-circuited (b) slip-rings are connected to a star-comected rheostat of 3 2 per phase. (Electrical Technology, Bombay Univ. 1987, and similar example: Rajiv Gandhi Techn. Univ. Bhopal, Dec. 2000)
Example 34.6. A 3-6 induction motor having a star-connected rotor has an induced e.m.f. of 80 volts between slip-rings at standstill on open-circuit. The rotor has a resistance and reactance per phase of 1 2 and 4 2 respectively. Calculate current/phase and power factor when (a) slip-rings are short-circuited (b) slip-rings are connected to a star-comected rheostat of 3 2 per phase. (Electrical Technology, Bombay Univ. 1987, and similar example: Rajiv Gandhi Techn. Univ. Bhopal, Dec. 2000)
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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Question
Example 34.6. A 3.6 induction motor having a star-connected rotor has an induced e.m f. of §0 volis benween slip-rings at standstill on open-circuir. The rotor has a resistance and reactance per phase of 1 Qand 4 Q respectively. Caleulate current/phase and power factor when (a) slip-rings are short-circuited (b) slip-rings are comneced 10 a star-comnecred rheostat of 3 Q2 per phase. (Electrical Technology, Bombay Univ. 1987, and similar example: Rajiy Gandhi Techn, Uni. Bhopal, Dec. 2000)
![Example 34.6. A 3-6 induction motor having a star-connected rotor has an induced e.m.f. of 80
volts between slip-rings at standstill o open-circuit. The rotor has a resistance and reactance per
phase of 1 2 and 42 respectively. Calculate current/phase and power factor when (a) slip-rings
are short-circuited (b) slip-rings are connected to a star-comnected rheostat of 3 Q per phase.
(Electrical Technology, Bombay Univ. 1987, and similar example: Rajiv Gandhi Techn. Univ.
Bhopal, Dec. 2000)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3833d31f-c381-482c-a30a-70ad2aeda4a3%2F1f9f53eb-c487-4200-b930-39d42873ee93%2F1kc9p1b_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Example 34.6. A 3-6 induction motor having a star-connected rotor has an induced e.m.f. of 80
volts between slip-rings at standstill o open-circuit. The rotor has a resistance and reactance per
phase of 1 2 and 42 respectively. Calculate current/phase and power factor when (a) slip-rings
are short-circuited (b) slip-rings are connected to a star-comnected rheostat of 3 Q per phase.
(Electrical Technology, Bombay Univ. 1987, and similar example: Rajiv Gandhi Techn. Univ.
Bhopal, Dec. 2000)
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