Abstract
This paper presents a tubular permanent magnet (PM) linear generator (TPMLG) with one single stator and double translators for complementary energy generation platform. Moreover, groups of Halbach PM magnetized structure for double translators is applied to increase the radial air gap flux density and to decrease the axial air gap flux density in the TPMLG. Based on the linear generator model and finite element method (FEM), the radial air gap flux density and axial air gap flux density in the two translator of the TPMLG is calculated and analyzed comparatively. Magnet field distribution of the TPMLG with groups of Halbach PM magnetized structure is illustrated, no-load performance at constant velocity and at sine velocity is analyzed, respectively, and comparing with the radial magnetization PM, the detent force is analyzed contrastively. Finally, this study proposed an experiment system consisting of a TPMLG with a single translator, a cylindrical float and wave flume to verify the analysis results. Through comparative analyses, the proposed TPMLG with double translators and groups of Halbach PM magnetized structure fulfill the requirements of complementary energy generation platform systems.
Highlights
In the last few decades, fossil fuels have been the main energy source, and most of electric power in the world has been generated from it [1]
In the direct-drive WECs (D-DWECs) of the platform, the two translators of TPMLGs are connected with the floaters under the platform
The analysis results show that the TPMLG with double translators with high radial magnetic flux density, high conversion efficiency and low detent force fluctuation are significant to meet better performance for the wind and wave complementary energy generation platform
Summary
In the last few decades, fossil fuels have been the main energy source, and most of electric power in the world has been generated from it [1]. In reference [8], a PM linear model with electrical damping circuits was proposed and applied in point-absorber WECs, which suit the region with low wave density. For when wave power density is low, there have been some challenges for the generators adopted in D-DWECs, such as larger volume of the device, lower energy conversion efficiency and special motor structure to match the energy conversion system. The analysis results and test results show that compared with traditional linear generator, double translators structure with groups of Halbach PM magnetized structure can meet demands such as enough air-gap flux density, low detent force ripple, high peak of EMF and flexible structure. The proposed model meets the requirements of wind and wave complementary energy generation platform
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