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If induction motor load is incresed motor speed
decrases.But in syncronous motor load incrases speed
canstant why?
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Answer Posted / apeksha tarle
we all know that “Like poles repel each other". So, the North Pole in the stator repels the north pole of the rotor. Also the south pole of the stator repels the south of the rotor. This makes the rotor to rotate in anti-clockwise direction thus, half a period later, the stator poles interchange themselves, thus making them get aligned with “unlike poles" which attracts each other. I.e. the South Pole of the stator & the North Pole of the rotor gets attracted and get magnetically interlocked.
At this position the poles Ns attracts S and poles Ss attracts N. These opposite unlike poles of the rotor & stator start rotating in the same direction as the stator poles. This makes the rotor to rotate unidirectional and at a synchronous speed which is the same speed of rotation of the stator poles. Thus as the position of the stator poles keep changing with a rapid speed and reversal, the rotor poles also rotate and reverse as same as the stator thus causing the rotor to rotate at a constant
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