Analysis of a New Consequent-Pole Hybrid Excited Machine With Drum Winding

In this article, a new consequent-pole hybrid excited machine with drum winding (CPHE-DW machine) is proposed for electric vehicles (EVs). The stator tooth, which is divided into the armature and excitation tooth, is designed as the consequent-tooth structure to construct two individual flux paths. The dimension of the armature tooth is slightly larger than the excitation tooth. The drum winding is placed in the stator, which can be regarded as both the armature and excitation winding. Accordingly, the current input into the drum winding can be divided into the ac and dc components, in which the air-gap flux is regulated by the dc component. The U-type permanent magnets (PMs) are housed in the consequent-pole rotor with the sequence of PM-iron-PM-iron. Owing to the consequent-pole and consequent-tooth structure, a particular electromagnetic coupling effect can be achieved. The operating principle of the electromagnetic coupling effect is studied by several analytical models. The main flux paths of this proposed machine are introduced. Several main electromagnetic properties are predicted by the finite element (FE) method. Finally, a prototype of the CPHE-DW machine is manufactured to validate the correctness of the FE predictions and the analytical analysis.