Concentric-Type Windings

In a concentric-type winding, at least one coil set has 2 or more coils and non coils are overlapped each other. If some coil sets have only one coil, this winding type is also called "crossed concentric-type".

The single-layer concentric-type is formed of coils with different coil pitch, but with the same central line and of concentric-circle-like, therefore is named concentric-type. Its end connection can be arranged in layers, and therefore is convenient to imbed into slots. Nevertheless, the end magnetic leakage is a bit bigger.

Half-Coiled Concentric-Type Winding

An example of three-phase, four-pole, 24-slot, single-layer, half-coiled, concentric-type winding is shown on the left, and an example of three-phase, eight-pole, 36-slot, single-layer, half-coiled, crossed, concentric-type winding is shown on the right.

Whole-Coiled Concentric-Type Winding

An example of three-phase, four-pole, 48-slot, single-layer, whole-coiled, concentric-type winding is shown on the left, and an example of three-phase, four-pole, 36-slot, single-layer, whole-coiled, crossed, concentric-type winding is shown on the right.