Comparizon of Conventional and Unconventional 5-phase PM Motor Structures for Naval Applications

Multi-phase motors are widely used in marine propulsion. In this paper, a Multi-machine modeling of Surface Mounted PM motors is presented and applied to a 5-phase machine. The latter is proved to be equivalent to a set of two-phase fictitious machines each ones being characterized by a set of specific harmonic ranks. A simple control consists of supplying each fictitious machine with a current which contains only one harmonic. A five phase machine is then supplied by currents with only first and third harmonics. Considering this kind of control, it is shown that for a given stator resistance and average torque the Joule losses and the torque ripple are minimized if a simple criterion on the harmonics of electromotive force at constant speed is fullfilled. Different structures of rotor are then compared to examine numerically which improvements can be practically obtained. Key-Words: marine application, multi-phase PM motor, multi-machine, design.

[1]  Alain Bouscayrol,et al.  Vectorial formalism for analysis and design of polyphase synchronous machines , 2003 .

[2]  Hamid A. Toliyat,et al.  Five-phase induction motor drives with DSP-based control system , 2001, IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485).

[3]  D Gondouin.  New Diesel-electric Propulsion System Topologies , 2002 .

[4]  H.A. Toliyat,et al.  Field oriented control of five-phase synchronous reluctance motor drive with flexible 3/sup rd/ harmonic current injection for high specific torque , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[5]  S. Williamson,et al.  High torque dense naval propulsion motors , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[6]  Antero Arkkio,et al.  Design of Synchronous PM Motor for Submersed Marine Propulsion Systems , 2002 .