WHY THE SYNCHRORONOUS MOTOR IS NOT SELF STARTING, AND WHY
THE STATOR AND ROTOR IS COUPLED?
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Answer Posted / guest
when 3ph wdg is supplied with 3ph supply, a magnetic flux of
const magnetic field rotating at syn speed is produced at
stator.
at first half cycle(a period of 10 ms)N pole of rotor and N
pole of stator are repelled each other as well as S pole of
rotor and S pole of stator.in the next half cycle(a period
of 10 ms)poles of stator interchanged ie., N pole of rotor
and S pole of stator are attracted each other as well as S
pole of rotor and N pole of stator.
due to continuous and rapid rotation of stator poles, the
rotor is subjected to a torque which rapidly reversing.
because of its large inertia rotor cannot respond to such
reversing torque results remains stationary.hence
SYNCHRORONOUS MOTOR IS NOT SELF STARTING
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