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This paper presents the design, construction, and testing of a double-sided, dual airgap linear Vernier generator for wave energy conversion. Both the electromagnetic as well as mechanical design concepts are explored with a particular emphasis on the mechanical aspect given the fact that maintaining a dual airgap for this topology is challenging and has not been previously implemented.
The paper includes simulation results of the Hybrid Excited Claw Pole Generator with skewed and non-skewed permanent magnets. The test machine has claw poles on two rotor sections, between which an excitation control coil is placed. The novelty of this machine is existence of non-skewed permanent magnets on claws of one part of the rotor and skewed permanent magnets on the second one. The paper presents...
To solve the low power density disadvantage of direct-drive wave energy converter, caused by low direct-drive speed. A novel linear tubular field modulated permanent magnet generator is proposed, which can effectively improve the performance of this kind of generators. The operation of the proposed generator is analyzed. The generator performance is evaluated using finite element method. The results...
Cogging torque is an outstanding issue that regularly occurs in the Surface-mounted Permanent Magnet Synchronous Generator (SM-PMSG). Cogging torque is importand to be reduced because it will generate noise and friction on the generator so it will decrease the efficiency and lifetime of the generator. For wind turbine application, the cogging torque will hold back the production of electrical power...
Wave energy conversion can be simplified by using direct drive linear generators which may improve reliability. Numerous topologies of direct drive linear generators have been proposed in the last few decades such as the linear vernier hybrid permanent magnet (LVHPM) machine. However, the cost of this kind of machine is driven by the quantity of permanent magnet (PM) material. This paper proposes...
In this study, a three-phase flux-switching permanent magnet generator (FSPMG) with 12 stator slots and 10 rotor poles was proposed and designed for small water power generation systems. The topologies with different rotor pole combinations including the 12 stator slots and 11 rotor poles also comparatively studied in this paper. The design parameters and the generator dimensions were optimized by...
This paper describes the design and prototyping process of outer rotor permanent magnet generator meant for the use in small scale wind turbines. The initial design of the machine is presented. Main issues and phenomena, affecting the generator design, such as cogging torque and its reduction possibilities, selection and demagnetization risk assessment of permanent magnets, machine losses and thermal...
Provided with the reduction of the cogging torque by skewing slots and simultaneously the decent output performance, an analysis of a permanent magnet synchronous generator (PMSG) is proposed in this paper. Firstly, the best skewing angle with the lowest cogging torque is found and validated with the finite element method (FEM) software, ANSYS/Maxwell. To overcome the repellence of the cogging torque...
This paper presents the performance analysis and improvement of electric power generation for Oscillating Water Colum (OWC) wave energy converter using Finite Element Analysis (FEA). The existing power take-off system in OWC is based on induction machines which not only suffer from poor efficiency but require significant maintenance also. Conversely, synchronous permanent magnet (PM) generators offer...
This paper focuses on design analysis issues of direct driven permanent magnet synchronous generator (DDPMSG) which are widely used in large scale wind turbines. The permanent magnet synchronous generator (PMSG) of 1.5 MW output power which is driven directly without gear system is analyzed by Maxwell 2D RMxprt. The characteristics of generator include the cogging torque, induced coil voltages at...
An Outer-PM tubular linear generator has been designed to increase the power density and distance of relative movement. The design of the two buoys has been completed. Detailed design process of the proposed generator is described. Considering the cogging force and voltage, the linear generator has been optimized and final parameters have been determined. The integrated wave converter system has been...
This paper presents three configurations of direct- drive stator permanent magnet generators (SPMGs) as potential candidates for electric power generation. The design principles are discussed with details, while the proposed configurations are analysed by using the finite element method (FEM). In particular, the no-load electromotive forces (EMFs), the steady torques, the cogging torques, the flux...
This paper aimed to find out a model of 1 kWp flat-quasi linear permanent magnet generator (LPMG) for ocean wave power plant in South Java Ocean. First, a flat-quasi LPMG is modeled based on the wave characteristic at the placement site. The model was then simulated using finite element software of FEMM 4.2. Next, the model was optimized to find out the optimum output power and cogging force. The...
Renewable energy becomes popular lately. It could make the better environment, especially for sea waves that could utilized 2% of world energy demand. Linear generator is one of the alternative method in energy harvesting, especially sea wave. Direct drive linear generator has some topologies, such as single stator — dual translator, and dual stator — single translator. The proposed design were 2...
The paper presents the concept and results of simulation and experimental research of a claw pole generator with hybrid excitation. Hybrid excitation is performed with a conventional coil located between two parts of the claw-shape rotor and additional permanent magnets which are placed on claw poles. Within the research first a simulation and next constructed experimental model has been developed...
In this paper, a low-speed high-efficiency PMSG machine with small cogging torque has been implemented rigorously as the generator of a marine current turbine (MCT) system to harvest ocean current power. Furthermore, the proposed PMSG-based MCT system has been developed to investigate its feasibility of ocean current generation system at ocean surrounding of Taiwan. In addition, the MCT system has...
Exploiting the permanent magnet wind generator (PMWG) with high speed and high power density is one of the promising aspects in the field of the wind generator design. In this paper, the design principles of the high speed PMWG are proposed and the detailed design of a 360kW, 7000rpm PMWG used in a wind energy storage system is discussed. Based on the design scheme, the simulation has been conducted...
In this paper, design optimization and fabrication of a prototype permanent magnet brushless generator for a direct drive wind turbine has been considered. The main challenge in design of a low speed permanent magnet brushless generator is pulsating torque phenomenon due to cogging torque and electromagnetic torque ripple which can led to noise and vibration. In order to reduce pulsating torque components,...
A Permanent Magnet Synchronous Generator (PMSG), part of a wind turbine, has a function to convert mechanical energy into electrical energy. To rotate the first cycle, the generator is blocked by an opponent torque called detent torque/unload torque or cogging torque. This study aim to reduce the cogging torque, modifying teeth formation on the surface of stator teeth. Simulation of the model used...
This study reports the analytical computation including performance characteristics such like load line voltage and output power in combination with coupled-field circuit analysis of a 4kW direct drive permanent magnet synchronous generator (PMSG) to be used in a micro-scale run-of-the-river-station application. The specifications such like slot opening, pole embrace and magnet length of PMSG are...
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