Preliminary Investigation of a Novel Hybrid Radial and Axial Magnetic Circuit PMSM with Flux Weakening Capability

This paper presents a novel hybrid axial- and radial-magnetic circuit permanent magnet synchronous machine with flux weakening capability. The presented machine consists of a solid rotor and two stators, i.e. radial stator and axial stator. The PMs are radially buried in the solid rotor so that the flux flows into both radial and axial stator. The side face of the solid rotor is shaped by machining to form a sector ring as the axial magnetic poles. This paper describes the principle of the presented machine and designs a prototype machine. Then a 3-D FEM model is established for magnetic analysis. The flux of the axial winding and radial winding are calculated corresponding different d-and q-axis current. The results indicates that the presented machine exhibits higher power density and good capability for flux weakening thus can be a good candidate for PMSM with large scale of running speed.