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Why is starter necessary for a three-phase induction motor?
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Answer Posted / saravanan.s.r.
Starter is mainly used inorder to reduce the HIGH STARTING
CURRENT and to protect the electrical equipments.at the
time of starting the slip=1;speed=less; hence the rotor
resistance value equals '0' due to the relation r2(1-s)/s.
there is no back emf,such that it draws a high starting
current.It may lead to damage the equipments in motor.hence
to avoid this starter is used.main types of starters are
1.Direct On Line starter.
2.Auto Transformer starter.
3.Rotor Resistance starter.
4.Star - Delta starter.
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