Analytical modelling of Halbach linear generator incorporating pole shifting and piece-wise spring for ocean wave energy harvesting

Halbach permanent magnet (PM) array has attracted tremendous research attention in the development of electromagnetic generators for its unique properties. This paper has proposed a generalized analytical model for linear generators. The slotted stator pole-shifting and implementation of Halbach arr...

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Bibliographic Details
Published in:AIP advances 2018-05, Vol.8 (5), p.056615-056615-7
Main Authors: Tan, Yimin, Lin, Kejian, Zu, Jean W.
Format: Article
Language:English
Subjects:
Arrays
Boundary conditions
Dynamic models
Energy harvesting
Finite element method
Generators
Mathematical analysis
Permanent magnets
Springs (elastic)
Wave power
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Summary:Halbach permanent magnet (PM) array has attracted tremendous research attention in the development of electromagnetic generators for its unique properties. This paper has proposed a generalized analytical model for linear generators. The slotted stator pole-shifting and implementation of Halbach array have been combined for the first time. Initially, the magnetization components of the Halbach array have been determined using Fourier decomposition. Then, based on the magnetic scalar potential method, the magnetic field distribution has been derived employing specially treated boundary conditions. FEM analysis has been conducted to verify the analytical model. A slotted linear PM generator with Halbach PM has been constructed to validate the model and further improved using piece-wise springs to trigger full range reciprocating motion. A dynamic model has been developed to characterize the dynamic behavior of the slider. This analytical method provides an effective tool in development and optimization of Halbach PM generator. The experimental results indicate that piece-wise springs can be employed to improve generator performance under low excitation frequency.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5006633