Linear magnetic gear with HTS bulks for wave energy conversion

Abstract

This study proposes a linear magnetic gear (LMG). Unlike conventional LMGs, the proposed one purposely uses high-temperature superconducting (HTS) bulks replace permanent magnets (PMs). The high-speed mover of the magnetic gear is connected to the secondary of the linear permanent magnet generator (LPMG), which constitutes a direct-drive wave power system that converts wave energy into electrical energy. First, the LMG structure is presented according to the principle of magnetic field modulation, and the authors briefly analyzed the number of pole pairs of inner, outer, and ferromagnetic modulators. Second, they also established a finite element analysis model to analyze the performance of magnetic gear, including magnetic field distribution, radial air gap magnetic flux density, and force characteristic. An LMG with HTS bulks not only increased the radial air gap magnetic flux density but also improved the speed of LPMG. In conclusion, this experiment verifies the efficacy of direct-drive wave power takeoff system and effectively converts wave energy into electrical energy.

Optimal gear ratio selection of linear primary permanent magnet vernier machines for wave energy applications

“…Linear permanent magnet vernier generators (LPMVGs) are ideal candidates to provide a high force density at low speeds. The working principles of vernier structures are established on the magnetic gearing effect similar to magnetic gears, which allows them to offer a high force density [11,12].…”

A New Structure for the Coaxial Magnetic Gear With HTS Bulks for Fitness Car

“…CMG with high temperature superconducting (HTS) bulks were also recently presented in [8,9], which have high torque density. The linear MG with HTS bulks is presented in [10], and magnetic flux density and thrust force transmission capacity are higher than the conventional MG. In [11], a CMG topology using superconductors instead of PMs is proposed, which can produce a large torque density.…”

Framework for efficient dynamic analysis applied to a tubular generator for suspension applications

“…Furthermore, the energy that is normally dissipated in passive suspension solutions can be partly recuperated by such electromechanical machines, making the latter particularly attractive from an efficiency point of view [5][6][7][8]. Finite element analysis (FEA) is a mandatory step to accurately model and design electromechanical devices [9][10][11]. Moreover, to fully analyze the energy harvesting capabilities of a vibration harvester utilized in vehicle suspensions, the corresponding finite element method (FEM) model should be assembled, solved, evaluated, and intensively iterated for different road conditions.…”

“…Finite element analysis (FEA) is a mandatory step to accurately model and design electromechanical devices [9][10][11]. Moreover, to fully analyze the energy harvesting capabilities of a vibration harvester utilized in vehicle suspensions, the corresponding finite element method (FEM) model should be assembled, solved, evaluated, and intensively iterated for different road conditions.…”