Deduce the relation between rotor current frequency and supply frequency in the term of slip of an induction motor inductor motor
Answers
Answer:
The synchronous speed of the rotor in RPM N = 120f/P where f is the frequency of the stator current and P is the number of poles.
The operating speed No = N - Ns where Ns is the slip speed.
The frequency of the rotor current fr = Ns x P/120, so fr = 0 if the slip is zero.
If the operating speed is zero, Ns = N and the frequency of the rotor current is the same as the frequency of the stator current.
Answer:
Frequency of Generated EMF,f=NP/120 Hz
Explanation:
→ Let us take an alternator whose rotor is driven at a constant speed of "'N' rpm.
→ Let the no of poles : P
The frequency of the generated conf = f when one pair of N' & 's' poles moves post On the armature Condudor, the emf induced in the Conductor undergoes one full cycle, → Therefore, in one full revolution of the fed 8/m, Since (P/2). pairs of poles sweep past every armature Conductor, the emf induced undergoes P/2 Cycles
→
In one second, there are N/60 full revolutions •". No Of Cycles of the induced emf/ second. = No of cycles / revolution x No Of revolution fre P/₂ X N/60–NP/120 Cycles persec .
(de) Frequency of Generated emf, f= NP/120 Hz.
120
