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

Tan, Yimin; Lin, Kejian; Zu, Jean W.

doi:10.1063/1.5006633

Cited by 6 publications

(5 citation statements)

References 12 publications

(12 reference statements)

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“…The device's translator was sandwiched between two stators carrying flux in the longitudinal direction, while the translator carried flux in the transverse direction. Both slotless and slotted stators have been used in research to develop and find the best generator design [44]. The linear PM generator can be classified as an iron-core or air-core generator based on a core.…”

Section: Linear Permanent Magnet (Pm) Generator Topologiesmentioning

confidence: 99%

“…To design the Halbach array-based linear generator, Yimin Tan et al first used the Fourier decomposition to describe the Halbach arrays' magnetisation components. Using specially treated boundary conditions, they extracted the magnetic field distribution based on the magnetic scalar potential method [44]. In the Halbach PM arrays, the magnetic flux can be cancelled on one side of the array, while the magnetic flux is enhanced on the other side.…”

Section: Permanent Magnet (Pm) Modificationsmentioning

confidence: 99%

“…Ocean test [165,166] Wave tank test [6,42,78,86,[167][168][169] Test rig test [33,36,44,45,52,72,83,92,93,[170][171][172][173][174][175]…”

Section: Type Referencesmentioning

confidence: 99%

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A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

2022

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The traditional wave energy converters (WECs) use hydraulic or turbine-type power take-off (PTO) mechanisms which consist of many moving parts, creating mechanical complexity and increasing the installation and maintenance costs. Linear generator-based direct-drive WECs could be a solution to overcome this problem, but the efficiency of the single conventional linear generator is not high enough, and it cannot work satisfactorily in the low-frequency range. This article reviews the recent research developments of the linear permanent magnet (PM) generator-based WEC to harness maximum energy from ocean waves. It starts with a brief introduction and background of wave energy converters using linear generators. Following this, the working principle of the WECs with linear PM generators is briefly outlined. Subsequently, the analytical model of the linear PM generator-based WEC is studied. After that, the up-to-date developments of the linear PM generator-based PTO systems are studied. Despite some modifications resulting in complexity in the linear PM generator’s structure and a rise in manufacturing costs, the study shows the systems’ efficiencies increased by increasing magnetic flux and reducing cogging force. The key parameters and improvement issues that can increase the performances and efficiencies of the PTO systems are identified to help future researchers for further development. Moreover, the review discusses the numerical and experimental analysis tools, the typical control systems used by the researchers and the challenges of the linear generator-based wave energy conversion system. Finally, conclusions about the significant beneficial characteristics and design choice of the WEC linear generator structure are provided and related to the application conditions.

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Section: Linear Permanent Magnet (Pm) Generator Topologiesmentioning

confidence: 99%

Section: Permanent Magnet (Pm) Modificationsmentioning

confidence: 99%

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A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

2022

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“…According to the characteristics of small wave power in summer, taking V = 0.5 m/s, the polar distance τ = 25 mm can be calculated. In this paper, the PMLG based on the Halbach PM array [23][24][25][26] adopts the structure of three slots and four poles, so the primary effective length of the generator can be obtained. Generally, the calculated power is determined by the rated index of the generator:…”

Section: Electromagnetic Calculation Of Pmlgmentioning

confidence: 99%

Design and Analysis of a High Power Density Permanent Magnet Linear Generator for Direct-Drive Wave Power Generation

et al. 2022

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Wave energy is a new type of clean energy. Aiming at a low wave energy density and small wave height in China’s coastal areas, a tubular permanent magnet linear generator (PMLG) with a short stroke, small volume, and high power density is designed for wave power generation. Firstly, the generator’s electromagnetic parameters are analyzed by the analytical method, and the magnetic circuit topology and basic structure of the generator are analyzed by the equivalent magnetic circuit method (EMCM). Then, the finite element method (FEM) is used to analyze the influence law of the generator’s basic structural parameters on the output electromotive force (EMF) and its sinusoidal characteristics. The multi-factor and multi-level analysis is carried out based on the orthogonal test method to study the size parameters of the above analysis, and the optimal structure parameter combination for the generator is obtained. Finally, the prototype is trial-produced and tested for steady-state and transient performance to confirm the accuracy of the simulation calculations, and the output performance under no-load and load conditions is examined. The results show that both the optimized prototype’s power density and the output EMF’s sinusoidal properties have been improved under the proposed scheme.

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“…Harvesting ocean wave energy has various convertors with different configurations. There are oscillating water column, hydraulic transmission and direct-driven linear generator [17], as shown in Fig.1. In the third type, the convertor has a construction of two-body oscillating buoy and uses the Halbach linear generator as the secondary energy convertor.…”

Section: Introduction Of Ocean Wave Energy Convertormentioning

confidence: 99%

Optimization Design for Ocean Wave Energy Convertor

Liu

Tan²,

et al. 2020

E3S Web Conf.

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Establishing a theoretical model for Ocean Wave Energy Convertor in advance is a necessary step during studying the energy harvesting of ocean wave which can save the engineering cost and improve research efficiency. Since low energy conversion efficiency existed in wave energy convertor when capturing ocean wave energy, the mechanism of slotless Halbach linear generator which can optimize the magnetic field distribution of the generator is adopted as the secondary energy conversion devices to solve the problem. The magnetic vector potential theory is introduced to analysis the topology of Halbach linear generator, then expressions of the generator’s performance have been deduced. Hence, the analysis model of the Halbach linear generator has been settled. To obtain the global optimal solution, the simulated annealing algorithm has been used to slove that derived model. Then a series of linear generator’s design parameters are fixed, which include dimensions of permanent magnets and winding coils. The error of linear generator’s peak power between analytical solution results and simulation results is about 3.6%. The experiment result demonstrates that maximum output power of optimized Halbach linear generator reaches 570w.

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

Cited by 6 publications

References 12 publications

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

Design and Analysis of a High Power Density Permanent Magnet Linear Generator for Direct-Drive Wave Power Generation

Optimization Design for Ocean Wave Energy Convertor

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