![]() Another primary permanent linear generator (PMLG) has been proposed in Keysan et al. (2012) to minimize the overall system mass. A lightweight translator has been proposed in Farrok et al. (2017) to improve the dynamics of the linear generator. An encouraging way to convert OWE into electricity is to use a linear, synchronous, longitudinal flux permanent magnet motor, in which the piston is driven by a buoy (Ekergård et al., 2020). A new dual-port linear electrical generator (DPLEG) is capable of transferring electrical power to an adequate voltage even at zero vertical velocity of the oceanic wave (Farrok et al., 2020). The optimal electrical energy extraction from wave energy is investigated using a dual coaxial-cylinder system, which operates with a permanent magnet linear generator (Son et al., 2016). Most papers focus on the improvement of the electrical power generation from OWE in various ways. A linear primary permanent magnet is described in Du et al. (2013), which is proposed for direct drive OWE conversion. Due to their utilization of the direct-drive linear motion system, a linear point absorber wave energy harvesting device was developed in the Lysekil project at Uppsala University, Sweden the power system used in the linear generator unit is specified with clear requirements (Temiz et al., 2018 Leijon et al., 2008). A direct drive linear generator has been found to be attractive compared to other generators, which can directly convert the wave energy into electrical energy the energy loss of the intermediate conversion link is reduced (Zhang et al., 2019). The energy converter system is usually a hydraulic or direct drive. These structures are rarely used in wave energy conversion devices. Parallel manipulators are closed-loop mechanisms presenting very good potential in terms of accuracy, rigidity, and ability to manipulate large loads. At present, parallel mechanism has been successfully used in various industrial fields such as the delta parallel robot (Dastjerdi et al., 2020) and Gough–Stewart parallel manipulators (MGSPMs) (Gexue et al., 2004 Katsushi et al., 2004 Tong et al., 2020). WEC based on parallel mechanism is suitable for harvesting. Waves have a variety of scales: seasonal, daily, or even hourly. The structure of energy harvesting includes the oscillating float, the oscillating water column, and pendulum most of them are mainly used to absorb wave energy in the heave direction. ![]() The energy harvesting system and the converter system are the two main parts of WEC. Wave power generation is a main form of wave energy utilization, which is mainly realized by wave energy converter (WEC). The conversion and utilization of wave energy is an effective way to reduce dependence on fossil fuels. The potential energy that can be extracted from ocean waves is about 2000 TWh yr −1 (Ghasemi et al., 2017), which is the same order of magnitude as the current world's annual power consumption (Drew et al., 2009). Ocean wave energy (OWE) is regarded as a promising source of energy (Clément et al., 2002). With the gradual depletion of fossil fuels, developing renewable energy has received worldwide concern. The conversion rate of wave energy is derived. ![]() For a case, dynamic differential equation of the whole system is established. Furthermore, the rule of electromagnetic resistance is discussed with the change of the speed amplitude and the angle frequency. Numerical results show axial magnetization and Halbach magnet array can increase magnetic flux intensity more than radial mode. Through electromagnetic numerical simulations, the influences of linear generator parameters such as magnetization mode, air gap, and yoke shape on electromagnetic performance were evaluated. Based on the inverse kinematics analysis of parallel mechanism, the position of the parallel mechanism is solved by using the space closed-loop vector method the relative motion of stator and translator is obtained. Each chain is equipped with the linear generator of the same structure, which can convert the absorbed wave energy into electrical energy. ![]() A buoy connected to moving platform is used to harvest wave energy. Considering the irregularity of wave motion, a wave energy converter (WEC) based on 6-UCU parallel mechanism has been investigated.
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