July 28, 2012

Why are starters used for starting 3-phase induction motors?

Starters for three phase induction motors:
For starting of 3-φ induction motor, we need Y-∆ (star – delta) starter. These starters are useful for safe running of induction motor by applying 1/3 times of voltage in Y- mode for safety of induction motor. When motor gets 80% of speed we apply full voltage Vph=VL in ∆ mode; during this time sufficient back e.mf is developed to limit the input current. 


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