Half-coil and whole-coil windings Engineering Study material

Half-coil and whole-coil windings

Half-coil (also called single-layer) windings are sometimes used in small induction motor stators and in the rotors of small wound-rotor induction motors. A cross section of a half-coil, single-layer winding is shown in Fig. 9(c)(i). Like the dc dynamo armature windings, most commercial armatures for ac synchronous generators are of the full or wholecoil two-layer type, shown in cross section at the right in Fig. 9(c)(ii). The whole-coil, two-layer winding gets its name from the fact that there are two coil sides (one coil) per slot. Fig. 9(a) shows a single-layer, half-coil lap windings;Fig. 9(b) shows a double-layer, full-coil lap winding. A cross section of a single layer (half-coil) winding .