Jump to content

Star Delta Winding


Recommended Posts


If a motor is "delta/star", its mean it is intended for either of two voltages: 120/220, 220/400, 400/660, etc. Higher voltage (star) is more preferable energy efficiency wise as less energy is lost in wires.

Link to comment
Share on other sites



Stator winding in star configuration will have line current reduced by 1/sqrt(3) of the line current of a delta connected motor. The torque will be reduced to 1/3 of the torque of a delta connected motor.


An example, a 100kW delta connected motor will have its power reduced to 33.3kW if the stator winding is connected in star.






Link to comment
Share on other sites

Hello jntewari


Provided that the motor is operated at the correct voltage for the winding connection (star or delta) there is no performance difference between the two connections.


If the motor is designed to e operated in delta, and it is operated in star at the design voltage, the motor is in efecte reduced in capacity to one third of its delta rating.


If the motor is designed to be operated in star for a given voltage, and then it is perated in delta at that voltage, it will be overfluxed, draw excessive current and will fail.


Best regards,


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...