why 3 phase induction motor only need starter ? why not other motors need sta

why 3 phase induction motor only need starter ? why not
other motors need starter ?(like synchronous motor,single
phase induction motors & their types) ?

Question Posted / ramya

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why 3 phase induction motor only need starter ? why not other motors need starter ?(like synchron..

Answer / irfan

3 phase indution need rotor resistance starter,dol starter
etc. because to reduse heavy starting current and provide
overload and novoltage protection

Is This Answer Correct ?

20 Yes

8 No

why 3 phase induction motor only need starter ? why not other motors need starter ?(like synchron..

Answer / 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

why 3 phase induction motor only need starter ? why not other motors need starter ?(like synchron..

Answer / balakrishna shetty

When 3phase induction motor is directly connected to the supply, it takes heavy current at starting ( 5 to 7 Times the full load current ) and creates a large voltage drop in the line.Due to this
(a). Motor winding May be damaged.
(b) Neighbouring consumers are inconvenienced.
To avoid this starters are used.

Is This Answer Correct ?

4 Yes

0 No

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