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Why is starter necessary for a three-phase induction motor?
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Answer Posted / p k neeraj
at the time of starting of induction motor speed is zero,so
back emf is also zero,as back emf is zero & rotor coil is
sorted(in case of squirrel cage rotor),starting current is
about 5 to 6 times higher then the rated current.so because
of this high voltage drop gets created in the supply line &
equipment connected to this line will experience this.so to
reduce the high current generally we use star delta
starter.at the time of starting we use star connection so
the voltage got reduce then at the time of run we use delta
connection.......
starters also increase the starting torque & improves the
power factor.
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