Answer / vinothkumar.m

the average torque exerted on the rotor is zero. And hence the synchronous motor is not self starting.

Answer / khalidulislam7@gmail.com

As per the operating principle of the Synchronous motor, due to continuous & rapid rotation of stator poles,the rotor is subjected to a torque which is rapidly reversing i.e. in quick succession,the rotor is subjected to torque which tends to move it first in one direction & then in the opposite direction.Owing to its large inertia,the rotor cannot instataneously respond to such quickly-reversing torque,with the result that it remains stationary or in other words it is not self starting......by
khalidulislam7@gmail.com

Answer / gokulnath

Synchronous motor cannot exert high starting torque at a time of starting because of its construction. so it needs starters.

Answer / rupesh

The rotar is acted by two forces in opposite direction ,it does not rotate so thats why syncronous motor is not self started.

Answer / tapiwanashe

because the torque is only developed when the synchronous motor is running at the speed of magnetic flux , therefore, the motor needs some type of device such as damper winding to bring the rotor to synchronous speed

. How to calculate the Short Circuit Impedance in Transformer? How to calculate the Short Circuit Impedance in Transformer?

0 Answers  

what is the advantage of Cathodic eathing system and what is the basic principle and how itis working, please explain clearly .

2 Answers   Meinhardt,

why two point starter,three point starter, four point starter cannot be used for A.C machines?

2 Answers  

why do harmonics generata?

1 Answers  

1 Ton is equal to how many watts?

0 Answers  

What do you mean by per capita requirement of electrical energy in india

0 Answers   Tech Mahindra,

HOW DOES THE FAN REGULATOR CONTROLS ITS SPEED

6 Answers  

In LT Line What is the minimum clearance required between phase to phase busbar & between Phase to body of the panel? Also between Neutral &phase, & Neutral & body of panel. as per standards.

1 Answers  

What are the various reasons for an inductin motor to get heated?

1 Answers   Monnet,

hi i am aziz electrical associate engineer. i am faceing problem in acs800 vvvf drive.it is tripping wothout any alarm/fault.i cheaked all parameters and fault function of drive, all are correct as well as communication parameters.but still it is tripping (drive is tripping in running position not in starting)

1 Answers  

How to find HT side and LT side(of a transformer),with the help of a voltmeter?

1 Answers   Odisha Power Generation Corporation OPGC,

Terminal blocks is used for segregate the connections... There is any principle for terminal block..?

0 Answers