How does a 3 phase induction motor is started?
- 3 Answers
- 5808 Views
- IOCL, I also Faced
- E-Mail Answers
Answer Posted / rsr
3 phase supply fed to 3 phase stator winding produces rotating magnetic field rotating at synchronous speed. This field cuts the rotor conductors(bars) and according to faraday's law of electromagnetic induction, an emf is induced in the conductors. since the conductors are short circuited by end rings(squirrel cage), thus current stsrts flowing & it produces its own field. now, we have two fields - one produced by stator and other by rotor , the interaction of these two field led to the development of torque in the direction of rotating magnetic field as per the lenz law
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
What is ideal IR values for ground and neutral.
In case of salient pole alternator when number of poles are 4 or more than 4 it helps the flux wave to be sinusoid as air gap length is increased from center to tip , but if the number of poles are 2 how does the flux wave is sinusoidal?
what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?
Single line digram for 11 kV to distribution use go,la and do
the winding of Generator and Motor is star or in delta ? and why
Please brief what is sinewave
what is the maintaining Cf in UPS.
hi Is there any possibilities to find out the rotation of a shaft or something else by using electromagnectic waves or by IR rays.If s then can v change the dir., of rotation of the same by remotely?& how? plz dn't any1 say "NO r CAN'T"
Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............
why single phase to grd test in HV cable?why not 2 phase at a time?
what is capacitor voltage transformer?? how it is different from potential transformer?
what is package substation.how many types they have
What is the difference between electronic regulator and ordinary electrical rheostat regulator for fans?
How seriving & testing of the HT & LT breakers are done. What are the standard Ir values on which we can come to know the test is passed or failed?
What is meant by impedance? difference between high & low impedance ?
