Title :
Comparison of Axial Flux PM Synchronous Machines With Different Rotor Back Cores
Author :
Marignetti, Fabrizio ; Colli, Vincenzo Delli ; Carbone, Silvio
Author_Institution :
Dept. of Autom. "Maurizio Scarano", Univ. of Cassino, Cassino, Italy
Abstract :
Rotor losses of axial flux permanent magnet (PM) synchronous machines with fractional windings depend on stator magneto-motive force (MMF) harmonics. To reduce rotor losses, a soft magnetic composite rotor can be used. This paper focuses on the comparison between two machines with the same soft magnetic composite stator and different rotor cores: one of solid steel and another of soft magnetic composite. The study evidenced the composite rotor improved the power density and the efficiency. Moreover, it highlighted a nonlinear salient-pole operation of the composite rotor machine, mainly connected to spatial harmonics.
Keywords :
cores; losses; magnetomechanical effects; permanent magnet machines; rotors; soft magnetic materials; stators; synchronous machines; axial flux PM synchronous machines; efficiency; fractional windings; magnetomotive force harmonics; nonlinear salient-pole operation; permanent magnet; power density; rotor back cores; rotor losses; soft magnetic composite rotor; soft magnetic composite stator; Machine windings; Magnetic cores; Magnetic flux; Magnetic losses; Permanent magnets; Soft magnetic materials; Solids; Stator cores; Stator windings; Synchronous machines; Synchronous machines; axial-flux machines; losses; soft magnetic composites;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2034021
