Pole-modulated PM direct-drive generator for wave energy conversion

This paper describes the general design considerations and analysis for a direct-drive generator for wave energy conversion. Direct drive wave energy converters have been proposed in view of the disadvantage of mechanical complexity and low conversion efficiencies in conventional wave energy converters. By directly coupling an electrical generator to an oscillating wave energy device, it is suggested direct-drive power take-off could be a viable alternative to hydraulic based systems. The operation fundamentals, combined with FE (Finite Element) analysis are discussed with the target operation in the low speed high torque requirements. The pole modulated design converts the slow motion to a higher generator output frequency. The generator design principle, comparisons between different topologies, as well as prototype designs at different speeds are analyzed and compared with conventional permanent magnet (PM) type machines.

[1]  T. Lipo,et al.  Novel dual-excitation permanent magnet Vernier machine , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[2]  H. Polinder,et al.  Conventional and TFPM linear generators for direct-drive wave energy conversion , 2005, IEEE Transactions on Energy Conversion.

[3]  N.M. Kimoulakis,et al.  Power Generation Optimization From Sea Waves by Using a Permanent Magnet Linear Generator Drive , 2008, IEEE Transactions on Magnetics.

[4]  Nick J. Baker,et al.  Vernier hybrid machines for compact drive applications. , 2004 .

[5]  K. T. Chau,et al.  Design and analysis of a transverse flux permanent-magnet machine using three-dimensional scalar magnetic potential finite element method , 2008 .

[6]  Ozan Keysan,et al.  Design and Testing of a Linear Generator for Wave-Energy Applications , 2012, IEEE Transactions on Industrial Electronics.

[7]  Ronghai Qu,et al.  Sinusoidal back-EMF of vernier Permanent Magnet machines , 2012, 2012 15th International Conference on Electrical Machines and Systems (ICEMS).

[8]  Thomas A. Lipo,et al.  Operation and design principles of a PM vernier motor , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[9]  H. Polinder,et al.  Linear PM Generator system for wave energy conversion in the AWS , 2004, IEEE Transactions on Energy Conversion.

[10]  Chunhua Liu,et al.  Design of a Magnetic-Geared Outer-Rotor Permanent-Magnet Brushless Motor for Electric Vehicles , 2007, IEEE Transactions on Magnetics.

[11]  M. Leijon,et al.  Study of a Wave Energy Converter Connected to a Nonlinear Load , 2009, IEEE Journal of Oceanic Engineering.

[12]  C. Josset,et al.  Design Methodology for a SEAREV Wave Energy Converter , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[13]  Markus Mueller,et al.  Electrical generators for direct drive wave energy converters , 2002 .

[14]  Fabrizio Marignetti,et al.  A Tubular-Generator Drive For Wave Energy Conversion , 2006, IEEE Transactions on Industrial Electronics.

[15]  Markus Mueller,et al.  Power Conditioning of the Output from a Linear Vernier Hybrid Permanent Magnet Generator for using Direct Drive Wave Energy Converters , 2005 .

[16]  Tze-Fun Chan,et al.  Permanent-Magnet Machines for Distributed Power Generation: A Review , 2007, 2007 IEEE Power Engineering Society General Meeting.

[17]  F. Blaabjerg,et al.  Power electronics as efficient interface in dispersed power generation systems , 2004, IEEE Transactions on Power Electronics.

[18]  M. Leijon,et al.  Multiphysics simulation of wave energy to electric energy conversion by permanent magnet linear generator , 2005, IEEE Transactions on Energy Conversion.