Which of the statement is true about 3- phase induction motor (IM) ? Ns: Synchronous speed

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter35: Harmonics 916
Section: Chapter Questions
Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...
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Which of the statement is true about 3-
phase induction motor (IM) ?
Ns: Synchronous speed
The rotor magnetic field of IM rotates at Ns
but stator magnetic field rotates at less than
Ns
Both rotor magnetic field and stator magnetic
field rotates at Ns
The rotor magnetic field of IM rotates at the
speed less than Ns but stator magnetic field
rotates at Ns.
Both rotor magnetic field and stator magnetic
field rotates at the speed less than Ns
The magnitude of the flux in the air-gap
of 3-phase induction motor
is
None
Depends on the slip of induction motor
Depends on the phase sequence
Depends on supply frequency
Transcribed Image Text:Untitled Section Which of the statement is true about 3- phase induction motor (IM) ? Ns: Synchronous speed The rotor magnetic field of IM rotates at Ns but stator magnetic field rotates at less than Ns Both rotor magnetic field and stator magnetic field rotates at Ns The rotor magnetic field of IM rotates at the speed less than Ns but stator magnetic field rotates at Ns. Both rotor magnetic field and stator magnetic field rotates at the speed less than Ns The magnitude of the flux in the air-gap of 3-phase induction motor is None Depends on the slip of induction motor Depends on the phase sequence Depends on supply frequency
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