What type of Motor Connection? Star or Delta


What type of Motor Connection? Star or Delta



b). Star Connection

The star (or wye) connection is one of two conventional methods for connecting the windings of a 3-phase electric motor; the other is the delta connection.

Here’s an in-depth look at why and how star connections are employed in motors.

What is a Star Connection?

A star connection connects one end of each of the three windings to produce a common point (known as the neutral point), while the other ends are linked to the power supply lines. This creates a shape resembling a star or the letter β€œY,” hence the name.

Features of a Star Connection

In a star connection, the line voltage equals the phase voltage times the square root of three

VL ​ = VP ​ ​ X √3 ​

This results in a reduced line voltage along each winding, which helps to start the motor and minimizes the early inrush current.

Motors often draw a large amount of current upon beginning. The star connection minimizes the beginning current, which helps to reduce mechanical stress on the motor and electrical stress on the supply network.

Star connections are chosen for high voltage motors because they can tolerate greater volts without requiring as much insulation as a delta connection.

Many motors are built to have dual voltage. They can be linked in star mode for high voltage operation or delta mode for low voltage operation, allowing for flexibility depending on the available power supply.

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Star connection decreases starting current by dispersing the line voltage across each winding, making it ideal for high-voltage applications and a smoother motor starts. It joins one end of each winding to provide a neutral point, while the other ends are connected to the power supply lines.