Is a induction motor rotate by back emf ? If not , then how it is rotate ?
Answer / chandru
Yes,back emf should be there to run it as an induction
motor.Normally what will happen is, when you give 3 phase
power to stator,rotating magnetic field(rmf) will be
created over it.Inturn,this rmf will induce an emf in rotor
side.According to lenz law,obviously this induced emf will
oppose the cause that produces it.Here, the cause is
relative motion between stator's rotating mag field and
rotor speed.Normally,we will call it as slip.So, it will
try to make that relative motion to zero.Due to this
operation, induction motor will rotate.If suppose,rotor
speed catches the stator's rmf,induction motor will
stop.Finally, the main thing to note here is that, it wont
run without slip.
|Is This Answer Correct ?||3 Yes||1 No|
How does frequency affect KVA rating of a transformer? If a 500 kva, 500 to 250 v, 60 hz t/f normally used in Canada is to be operated in Europe on 50 hz frequency then how will its KVA rating change? a-increase b-decrease c-remains same
how choose conductor &caple&wire depending upon the load
what is the significance of per unit impedance ?
why phase to phase voltage are 290 rather then 440?
Haw to check conductivity of budbar
what are the protecyion of transformer & generators
what is the disaddvantages of high power factor
why cant we use earth as neutral at home whereas neutral is actually grounded at transformer end?
how much cuurrent flow through human body effected ????
What is process of anneling transformer core
why motor burns ?
Explain and give me an example of a time when you had to explain some new procedures to your co-workers for quality service delivery, how did you go about it?