# Delta or Star connection of machine windings?

Posted on June 26, 2013

Emetor calculates directly with the phase voltages and phase currents, and therefore does not need any information about whether your machine windings are delta or star connected. In this blog post, you will find all necessary information in order to determine the phase quantities used in Emetor from the line quantities of your supply depending on the connection type.

The delta (Δ) connection is sometimes also called triangle, π (spelled out as 'pi'), or mesh connection.

The star (Y) connection is sometimes also spelled out as 'wye' or called as T connection. With the star connection, the neutral point is physically accessible, refer to Fig. 1.

Fig. 1 Schemes for delta and star connection of machine windings.

The electric motor design software Emetor calculates directly with the phase voltages $U_{ph}$ and phase currents $I_{ph}$ of the three machine windings $U$, $V$, and $W$, refer to Fig. 1. As a consequence, Emetor does not need any information about whether your machine windings are delta or star connected.

The choice between delta and star connection of your machine windings is often dependent on the voltage and current ratings of your supply. In the table below, you can find relevant equations to determine the line quantities ($U_{line-line}$, $I_{line}$) of your supply from the phase quantities used in Emetor depending on the connection type.

 Connection type Delta (Δ) Star (Y) $U_{line-line}$ $U_{ph}$ $\sqrt{3}U_{ph}$ $I_{line}$ $\sqrt{3}I_{ph}$ $I_{ph}$

Categories: Electric machines theory • Tags: Simulation parameter Winding calculator