Answer Posted / farha

A starter is needed for a three phase induction motor
because at the time of starting, if induction motor is
started directly, it will draw large amount of current
which causes damage to adjoining equipments.
Thus, a starter is needed in order to limit the starting
current.After the motor has started at reduced starting
current and hence reduced voltage, the connections are
diverted towards the mains supply so that now, the motor
can run at higher starting current and voltage.
Four types of starting methods are employed:
1.Star-Delta
2.Auto transformer method
3.Primary resistor starting.
4.Direct On-line.
Low rating upto 7 H.P motors can be started directly.

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