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This paper describes two alternative designs of a direct-drive permanent-magnet generator for use in a novel sea-wave electrical generator. The basic system is briefly described and the target specification is given from the wave device. The design for a fractional-slot high-pole number brushless permanent-magnet generator and a torus generator are sized and developed using the design packages SPEED...
A 50kW linear permanent magnet generator with a novel topology has been designed and built. The main significance of the generator topology is that there is no attractive force between the stator and permanent magnet translator. The magnetic force between the magnets is reacted within a self supporting structure. The lack of magnetic forces closing the airgap and the modular nature of the generator...
In this paper the optimization of a Tubular Permanent Magnet-Linear Generator (TPM-LiG) for energy generation is presented. The application is related to the sea wave energy generation for small sensorized buoy. The optimization process is developed by means of an hybrid evolutionary algorithm widely presented in the paper. The advantage of this algorithm is in the wide exploration of the variables...
This paper presents the design procedure and modeling methodology for a four sided floating type of linear permanent magnet generator used in sea wave energy extraction applications. The hydraulic system of wave generation with buoy has been developed. Appropriate coupled magnetic-electric-mechanical models for the analysis of the linear permanent magnet (LPM) generator is researched with finite element...
In this paper, a novel flux-switching permanent magnet (FSPM) linear generator is proposed for wave energy extraction. The linear generator is analyzed by using 2D finite element method (FEM) to investigate the electromagnetic characteristics. The result shows that the proposed generator has advantage of the voltage waveform by reducing the cogging effect. The computational results are verified by...
This paper analyses the stator teeth geometry effects on cogging force of permanent magnet linear generators. The method making translator adjacent sides' permanent magnet allotropic is proposed to minimize the cogging force of four sided permanent magnet linear generators. The dynamic modeling of the generator's performance is based on finite element method. The generator is coupled to a particular...
Linear permanent magnet generators are a potentially useful technology for wave power applications. Typically, optimisation and comparison of these generators is based on an electromagnetic analysis with limited regard for the structural and thermal analysis. This paper presents a comparison of an air-cored synchronous machine and a double-sided iron-cored synchronous machine which includes the structural...
A three-phase linear permanent magnet generator (LPMG) can be used to convert wave energy to electric energy. This generator has a simple structure and is economical to use compared with the conventional rotating generators. A LPMG is designed and simulated to convert wave energy to electric energy suitable for the north coast of Iran, Caspian Sea. Influence of wave amplitude, number of phases, floater...
This paper presents the optimization of a permanent magnet linear generator directly coupled to sea waves. In order to maximize energy extraction, the stochastic features of the energy source is included in the mathematical model of the system in order to satisfactorily tackle the problem. An optimization procedures which includes the stochastic features of the model is presented and a machine built...
A permanent magnet generator (PM) control scheme and electrical system configuration for Wave Dragon MW wave energy power take off system is presented in this paper. The characteristics of low pressure hydro turbine are introduced first. To achieve the maximum energy conversion efficiency, a variable speed control scheme of low-head hydro-turbine using IGBT AC/DC converter is described. The electrical...
The paper presents the design procedure and the modelling of performance for a special coupled electromechanical system, for use in sea wave energy extraction applications. The system is consisted of a specific linear permanent magnet generator combined with a cylindrical floating buoy moving due to the sea wave incidence. The system analysis requires particularly developed electromagnetic-mechanical-hydraulic...
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