A new 4/6 pole-changing double layer winding for three phase electrical machines

The paper presents a new double layer three phase 4 to 6 pole-changing winding, with 48 slots and 6 terminals. In order to obtain a higher fundamental winding factor when winding is 6-pole connected, a degree of asymmetry is accepted for the winding when 4-pole connected. The new winding is compared with a well known two-layer winding presented in literature. An experimental motor equipped with the new winding was built on a 4-pole base and frame 100 (2.2/1.5 kW) and tested. At the same time, 2D FEM field-circuit models were developed to simulate the operation of the experimental model equipped with the newly proposed winding, and model equipped with the well known two-layer winding.

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