Answer / ajith

the 1ph supply applied to stator wdng cant produce a
rotating magnetic field as in the case of a 3ph induction
motor..
if a 1ph is applied to the induction motor the resulting
magnetic field is only altrnating (not rotating)..
In order to make the 1ph induction motor self starting...,
2 windings are used ..startin windin n runnin wdng..called
split phase motor.. or by connectin a capacitor in series
with the start wdng.. for obtainin necessary phase
diplacement...

Answer / abhimanyu kumar gupta

Single phase IM given single phase supply given to stator
winding an alternating magnetic field develop in stator and
produce alternating flux and collides with rotor winding and
produce induced EMF at rotor since the rotor winding are
closed this produce induced current in rotor.
Due to this induced current in magnetic field of alternating
nature and this nature is not rotating. Both magnetic field
in stator and rotor are Colline's so resultant torque rotor
will 0. Hence single phase IM does not self start.
In order to make motor self start an external force to the
rotor should be given because of locking of field will
disappear.

Answer / venkat

back e.m.f reducing

what is principle operation of transformer?

9 Answers  

---

What is the difference between Relay and Contactor

35 Answers   Siemens,

---

what is electrical machines

1 Answers  

---

how can we calculate the ampacity of the electrical wire/cable. and what are the factors must be considered. pls. elaborate.

0 Answers   Webel,

---

Why does the radius of armature is less than the radius of pole shoe?

0 Answers   ABB,

---

can you plz send l&t aptitude questions if available its urgent plz plz plz

0 Answers   HPCL,

---

what is mean by flux

2 Answers  

---

We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers  

---

Write down the brushes of a de machine.

0 Answers  

---

How to calculate the KA rating for a circuit breaker if we know the KVA rating of the generator feeding it?

2 Answers  

---

What are the symptoms of a bad PG card of a drive (inverter) esp. of Yaskawa Ac Drives (inverters) G7 ?

0 Answers  

---

xplain in detail d pr. of synchronous motors? why syn. generators r used for the production of electricity?

4 Answers  

---