Answer / deshmukhgs

to avoid burning of the motor because of high curent

Answer / mohsin jamil

because motors start slowly with high torque and bcz of high
torque it needs high amp until it reaches to its full speed..
thats why we use Star connection or start the motor slow so
that motors winding doesn't burn

Answer / muthu kumaran

initially there is no back emf in motor and so current due to the supply voltage flows fully thru the motor.
for EX:230v supply resistance of motor is 0.15ohm -->I=230/0.15=1350.but the rated I is 45A.so that the motot gets damage.so we need to use the starter

Answer / tharan

reduceing for starting current....

Answer / brd ganesh

At the starting time 'EB=0'(back emf) so that
motor draws a 2 to 3 times of its full load current
and which cause to damege the winding. ummm....
That is why using stater to reduse starting current

Answer / simpson

when the motor is in off position the starting winding’s
resistance is 0 ohm .If in this condition 3 Phase 440 v is
directly applied on it the result will b blow of the starting
winding .Hence huge amount of heat will produce .

how to reverse the direction of universal motor?

2 Answers   Finolex, JGT, TATA,

if field current decreases how can the speed increase in the unloaded dc series motor

1 Answers  

EXPLAIN WORKING PRINCIPLE OF ALTERNATOR & MOTORS.

2 Answers   L&T,

what is the different between second harmonics and third harmonics ?

1 Answers  

WHAT MEANT BY SEVICE FACTOR?

2 Answers  

What's the differs between voltage & current & emf.

1 Answers   CTS, NTPC, TCS,

How much pf maintan in dg set in 6o% load,when Dg runnig Neutaal Earthing removed what happen.

0 Answers  

what is meant by re-rolling motor? how it differs from standard motor?

0 Answers  

why generally transformer are in star to delta or delta to star used?

8 Answers   ABB,

what is VSWR?

1 Answers  

Name quantities which are not transformed in the tranformer.

3 Answers  

what is the difference between RCCB and ELCB?

3 Answers