Design and Analysis of the Dimension of the PMs for the DMMSM using EMCM

Abstract

The Dual-magnet memory synchronous motor (DMMSM) utilize two kinds of permanent magnets (PMs), namely the aluminum-nickel-cobalt (Al-Ni-Co) and neodymium-iron-boron (Nd-Fe-B) materials, to provide effective flux-mnemonic feature. The radially placed Nd-Fe-B PM provides main flux, and the tangentially placed Al-Ni-Co PM provides controllable flux. The tangentially placed Al-Ni-Co PM can be forward or backward magnetized by the d-axis current. The flux-control characteristic of the DMMSM affected by the size of the two kinds of PMs has been studied in-depth using the equivalent magnetic circuit method (EMCM) combined with the parallelogram hysteresis model (PHM). And finally, the finite element method (FEM) simulation is carried out to verify the validity of the proposed EMCM.