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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 / manas ghosh
To produce a stable torque relative speed between rotor and stator field should be zero.
In sync. motor rotor is dc excited and the field itself doesn't rotate and stator is ac excited and stator field always rotate at Ns. So, to make the relative speed between rotor and stator zero the rotor should always physical rotate at Ns.
In IM to at any speed relative speed between stator and rotor is always zero. When load increase means torque should increase which means rotor current should increase and for that rotor induced emf should also increase. Now rotor induced emf is directly proportional to slip(s) (considering fixed input voltage). So, to increase torque in IM slip(s) should increase which means physical rotational speed of rotor should decrease.
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