Creating Closed Three-Phase Hairpin Windings (HairpinCoil)

1. In Maxwell 3D, launch HairpinCoil UDP with default setting, that is Slots=18, Layers=6, CoilPitch=3, 2ndPitch=3, LayerSetIdx=0, and InfoCoil=1. Since the ratio of Slots to (2ndPitch + CoilPitch) is 3 (an integer number), the UDP will create a closed-coil chain, or a coil loop, located at slot bottom, as shown below (excluding the core lamination).

   

2. Make a copy of the coil loop, and change LayerSetIdx to 1, this copied coil loop is changed to locate at the slot center.
3. Make a copy of the coil loop again, and change LayerSetIdx to 2, this copied coil loop is changed to locate at the slot top.

4. Duplicate all these three coil loops with the following parameters in Duplicate/Around Axis command: Angle = 20deg, Total Number = 6, and change colors for different phases, then you will get the final three-phase windings, as shown below.

   

   Closed three-phase hairpin windings