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why 3 phase induction motor only need starter ? why not
other motors need starter ?(like synchronous motor,single
phase induction motors & their types) ?
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Answer Posted / sudipta
Starter is connected in series with the armature. Now, this
armature current is given by Ia=(v-Eb)/Ra. Here, v is
terminal voltage, Eb is back emf, Ra is armature resistance.
In the case of an induction motor,at the time of
starting,back emf is zero. So, Ia=v/Ra. As Ra is very small,
Ia is too high. So,a resistance(R) is connected in series
with the armature. So, the starting current decreases and
motor gets protection from overcurrent.
| Is This Answer Correct ? | 11 Yes | 6 No |
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