A 3-0, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between slip-rings on open circuit. Calculate the current and power factor in each phase of the rotor windings at standstill when joined to a star-connected circuit, each limb of which has a resistance of 10 Q and an inductance of 0.03 H. The resistance per phase of the rotor windings is 0.2 Q and inductance 0.03 H. Calculate also the current and power factor in each rotor phase when the rings are short- circuited and the motor is running with a slip of 4 per cent.
A 3-0, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between slip-rings on open circuit. Calculate the current and power factor in each phase of the rotor windings at standstill when joined to a star-connected circuit, each limb of which has a resistance of 10 Q and an inductance of 0.03 H. The resistance per phase of the rotor windings is 0.2 Q and inductance 0.03 H. Calculate also the current and power factor in each rotor phase when the rings are short- circuited and the motor is running with a slip of 4 per cent.
Introductory Circuit Analysis (13th Edition)
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Publisher:Robert L. Boylestad
Chapter1: Introduction
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![A 3-0, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between
slip-rings on open circuit. Calculate the current and power factor in each phase of the rotor windings
at standstill when joined to a star-connected circuit, each limb of which has a resistance of 10 Q and
an inductance of 0.03 H. The resistance per phase of the rotor windings is 0.2 Q and inductance
0.03 H. Calculate also the current and power factor in each rotor phase when the rings are short-
circuited and the motor is running with a slip of 4 per cent.
[13.6 A, 0.48; 27.0 A, 0.47] (London University)
A 4-pole, 50-Hz, 3-phase induction motor has a slip-ring rotor with a resistance and standstill reactance
of 0.04 2 and 0.2 2 per phase respectively. Find the amount of resistance to be inserted in each rotor
phase to obtain full-load torque at starting. What will be the approximate power factor in the rotor at
this instant ? The slip at full-load is 3 per cent.
[0.084 2, 0.516 p.f.] (London University)
A 3-o induction motor has a synchronous speed of 250 r.p.m. and 4 per cent slip at full-load. The](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbda3ac01-158b-4675-99ac-f1acfe21548c%2F99853fc5-3142-4620-ad2a-92b4d3f015d7%2F8nvd8xu_processed.png&w=3840&q=75)
Transcribed Image Text:A 3-0, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between
slip-rings on open circuit. Calculate the current and power factor in each phase of the rotor windings
at standstill when joined to a star-connected circuit, each limb of which has a resistance of 10 Q and
an inductance of 0.03 H. The resistance per phase of the rotor windings is 0.2 Q and inductance
0.03 H. Calculate also the current and power factor in each rotor phase when the rings are short-
circuited and the motor is running with a slip of 4 per cent.
[13.6 A, 0.48; 27.0 A, 0.47] (London University)
A 4-pole, 50-Hz, 3-phase induction motor has a slip-ring rotor with a resistance and standstill reactance
of 0.04 2 and 0.2 2 per phase respectively. Find the amount of resistance to be inserted in each rotor
phase to obtain full-load torque at starting. What will be the approximate power factor in the rotor at
this instant ? The slip at full-load is 3 per cent.
[0.084 2, 0.516 p.f.] (London University)
A 3-o induction motor has a synchronous speed of 250 r.p.m. and 4 per cent slip at full-load. The
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