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Rotor emf per phase at standstill produce in the rotor is proportional to ________
Rotor Current
Flux per Stator pole (r.m.f) ├Шs
Slip
All of these
Flux per Stator pole (r.m.f) ├Шs
The correct answer is B) Flux per Stator pole (r.m.f) ╬жsтАЛ ┬╖ This is because the electromotive force (emf) induced in the rotor at standstill is directly proportional to the magnetic flux produced by the stator per pole.
The correct answer is B) Flux per Stator pole (r.m.f) ╬жsтАЛ ┬╖ This is because the electromotive force (emf) induced in the rotor at standstill is directly proportional to the magnetic flux produced by the stator per pole.
ErтАЛ=kтЛЕ╬жsтАЛтЛЕfтЛЕn тАФ Induced rotor EMF at standstill
At standstill, the rotor does not rotate, and thus, the slip is zero ┬╖ The induced emf in the rotor is given by ErтАЛ=kтЛЕ╬жsтАЛтЛЕfтЛЕn, where ErтАЛ is the rotor emf, k is a constant, ╬жsтАЛ is the magnetic flux per pole, f is the frequency, and n is the number of poles ┬╖ This shows that the rotor emf is primarily determined by the magnetic flux per stator pole.
The rotor emf is induced due to the alternating magnetic field produced by the stator.
At standstill, there is no relative motion, and the slip is zero; hence the flux per stator pole becomes the main factor.
Understanding rotor emf helps in designing efficient induction motors.
It allows for better control and analysis of motor performance.
High slip can lead to increased losses and reduced efficiency.
Non-linear behaviors in rotor dynamics can complicate operation.
Used in various AC motor applications such as pumps and fans.
Relevant in understanding the operation of motors in industrial automation.
Standard value for the magnetic flux per pole generally depends on the machine's design.
Option A is incorrect because rotor current does not solely determine the induced emf.
B is correct тАФ The rotor emf at standstill is proportional to the magnetic flux per stator pole.
Focus on the relationship between stator magnetic fields and rotor behavior as they are crucial in understanding induction motors.