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Saturday, August 3, 2019

star delta starter preferred with an induction motor

Why is star delta starter preferred with an induction motor?

Star Delta Motors are preferred as a method of starting in Low starting Torque Applications. The starting current of Induction motors are six to seven times the full load current. Starters are employed to reduce the starting current.

A star Delta Starter reduces the starting current by connecting the motor winding in Star at the time of starting. This reduces the voltage across the winding.The voltage across the winding will be( 1/Sqrt(3))*Line Voltage.
After the starting time set in the timer the winding will be connected in Delta. The voltage across the winding will be equal to the line voltage.
The switching of winding configuration is done by devices called contactors. Typical application of Star Delta motors are compressors

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