A Novel Parallel Magnetic Circuit Variable Flux Machine by Employing Flux Leakage

This paper proposes a novel parallel magnetic circuit variable flux machine by employing flux leakage paths (PMC-VFMFLP), improving the torque density, flux regulation range, and speed operation range of conventional PMC-VFMs with flux barriers. Both the high coercivity force (HCF) and low coercivity force (LCF) permanent magnets (PMs) are applied in this machine. The key to the proposed machine design lies in the position of flux leakage paths and the relative parameters of the two kinds of PMs. The finite-element analysis (FEA) is adopted to validate the effectiveness of the proposed machine. The FEA results indicate that a high torque density, a wide flux regulation range, and wide manipulate range with high efficiency can be obtained by the proposed machine simultaneously.