How do you connect a Star Delta motor

A star-delta is employed for a cage motor designed to run commonly on the delta connected mechanical device winding. The affiliation of a three-phase induction motor with a star-delta starter is shown within the figure below. once the switch S is within the begin position, the mechanical device windings square measure connected within the star as shown below.

Star Delta Starter

When the switch S is in the START position, the stator windings are connected in the star as shown below.

 

When the motor picks up the speed, regarding eighty p.c of its rated speed, the switch S is instantly placed into the RUN position. As a result, a stator coil winding that was in star affiliation is modified into DELTA affiliation currently. The delta affiliation of the stator coil winding is shown within the figure below.

 

Firstly, the stator coil winding is connected in star and so in Delta so the line current of the motor is reduced to tierce as compared to the beginning current with the windings connected in delta. At the beginning of Associate in Nursing induction motor once the windings of the stator coil square measure star-connected, every stator coil section gets a voltage VL/√3. Here VL is that the line voltage.

Since the developed torsion is proportional to the sq. of the voltage applied to Associate in Nursing induction motor. Star delta starter reduces the beginning torsion to tierce that’s obtained by direct delta beginning.

3 Phase Motor Capacitor Star Connection

 

A star-delta is used for a cage motor designed to run normally on the delta connected stator winding. The connection of a three-phase induction motor with the star-delta starter is shown in the figure below

Since the developed torsion is proportional to the sq. of the voltage applied to Associate in Nursing induction motor. Star delta starter reduces the beginning torsion to tierce that’s obtained by direct delta beginning.

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