Answer / ankush miglani 09718151073

in induction motor power is not fed to rotor but it is
induced in the rotor through electromagnetic induction.
its various starting methods are:
1. dol direct on line starting
2. star delta starter
3. through variable frequency drives
4. restance starter
5. auto transformer starter
6. series reactor starter

Answer / virendra joshi

Yes, as armine said that there is a diffrent method for
starting both the motores in single phase more it can be
driven as capacitor start, capccitor run ,also capacitor
start capacitor run motor.

Considering a three phase motor when three phase supply is
given to the startor winding rotating magnatic field is
developed which rotaes with syschronous speed ( NS =
120F/P ). now this magnatic field is connected to rotar bar
& as the rotar winding is shot ( in case of Squrell cage
rotor through copper ring & in case of sleepring rotor
through resistence ) so the current flows in rotor bar .
now as this in magnatic field . the force is applied on the
rotor . rotor start moving & as the magnatic field is
rotating rotor keep moving but is legs behind a bit then a
synchronous speed & this phenomina called a Slip.

please revert if any querry exists.

Answer / armine george

please specify whether its a single or three phase motor.
becoz both of them hav different starting methods

Answer / amjad ali soomro

The stator Like A primary and Rotor Acts as a secondary ,
When stator is powered by the primary the squirrel cage rotor .The substantial iron cores, with a very small air gap between stator core and rotor core, efficiently conveys the magnetic fields produced by the stator currents to the rotor conductors. A stator (primary) sine wave voltage will induce a sine wave voltage in the rotor (secondary), the same as any transformer. But the rotor will have no overall force acting on it to cause rotation. If its is 3-Phase than it will Automatically starts Revolving field developed by three phases
and if it is single phase than it will require external rotation...

what is the disadvantage of lagging power factor & why ?

2 Answers  

---

completed BE & done apprentice at tneb & having experience 6 years. want to get c license. will apprentiship & BE be helpful for getting c license. will i get any preference by showing this?

0 Answers  

---

AC SUPPLY HAVING 230 V FREQUENCY REDUCED ZERO IF MEN TACUCHES THE SUPPLY WEATHER HE GETS SHOCK OR NOT?

8 Answers  

---

How do you classify the different types of torques?

2 Answers  

---

why electronic instruments is more favorable than electrical?

0 Answers  

---

What is metering cubical? What is the use?

2 Answers   HSL,

---

what is the reason of current flow in nutral although load is balanced (three phase equal current)

3 Answers  

---

What is voltage divider rule?

0 Answers  

---

What is meant by turbo alternators?

0 Answers  

---

wat is the importance of reactive power in power generation.....if it is zero means wat will happen to system........

22 Answers   Bhel, Jindal,

---

How can CALCULAT the current carrying capacity of aluminum and cOpper cables respective of that Sq.mm ? with formulas ?

12 Answers   Bajaj, Eagle, Godawari Power and Ispat, Havells, L&T, Mascot, Polycab, SGML, Sterling Wilson,

---

High Voltage out door substation-annual maintenance, things to be considered

1 Answers  

---