A Novel Permanent Magnet Synchronous Machine with Axial Sandwich Structure for Flux Regulating Capability

In this paper, a novel hybrid excited permanent magnet synchronous machine (HEPMSM) is presented which can enhance the capability of flux regulation and improve the flux leakage at the ends of rotor. The presented machine consists of two radial stators, two radial rotors and an axial stator, and has both radial and axial magnetic circuits. The side of the rotor is machined to form several sector rings so that the flux flows into both radial and axial stators. The machine has two magnetic pole structures, NN type and NS type, which will affect the flux path of the machine. The analysis shows that the machine has fine flux regulation capability and high power density, therefore, it has advantages in the fields of wide speed range such as electric vehicles.