Abstract
This paper proposes new hybrid excitation synchronous machines (HESMs) with one/dual-direction built-in field windings. The HESM with magnetic shunting rotor is a new topology of brushless HESM with extended magnetic bridge to embed field windings. The rotor core extends along the axial direction and the increase of rotor length is inevitable, which significantly reduces torque density. In order to improve torque density, the excitation structure is optimized in this paper. First, the HESM with one-direction built-in field windings is presented. To improve the flux regulation capability and decrease the magnet consumption further, the HESM with dual-direction built-in field windings is proposed and investigated. The comparative study of the performances of the original topology HESM and the HESMs with one/dual-direction built-in field windings is carried out by 3D finite element analysis (FEA). An original topology HESM prototype and a PMSM prototype have been developed and the experimental results, which agree with the FE-predicted results, confirm the advantages of the original topology HESM and the validity of FEM used in predictions in this paper.
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