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 .

sir please tel me how calucalte kwh if home taken load 30ams how maney kwh taken per day.and 3phase motor 5hp per hars how maney load teken and how mach kwh and forward me to electrical table for calicalte kwh and kvr and kvah

1 Answers  

1.wat is the negative slip region in the motor?

1 Answers  

Why the ceiling fan rotates in clockwise direction and table fan rotates in anticlockwise direction.

3 Answers   Kirloskar, MPF, Wipro,

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0 Answers  

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3 Answers  

Define unilateral circuit?

0 Answers  

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0 Answers  

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3 Answers  

How do you classify the different types of torques?

2 Answers  

What happens instead of using 3 phase, if we give loop of single phase to all three phases ??

1 Answers  

Is there any local or International standards that prohibit the installation of earthing pit in the planters area where the earthing pit is subject to continues soak in water?

1 Answers  

What is DC power factor??

2 Answers   HCL,