A six-slot tubular permanent magnet linear generator is designed, simulated, fabricated and tested. The finite element method is used in calculation and simulation to get the accurate results. Optimization of the translator length is carried out to achieve the minimum cogging force. Tests are conducted to confirm the simulation results. Better performance is achieved in the proposed improved generator prototype.
"This force is generated by interaction of the stator teeth and PM fixed on the shaft, even in the open-circuit case. This force is important, because its peak value is high and thus it is one of the most important factors in the generator design –. In –, many LPMGs have been designed, simulated and tested. "
[Show abstract][Hide abstract] ABSTRACT: Although linear permanent-magnet generators (LPMGs) are widely used for converting wave energy into electrical energy, they suffer from large cogging force. The cogging force causes oscillatory output power, which shortens lifetime and increases the maintenance costs of the generators. To reduce this force in the generator, we have designed and simulated a three-phase LPMG for direct wave energy conversion and predicted its performance using the finite-element method. We studied the influence of different design parameters on the cogging force and minimized this force by varying the proposed parameters. The results obtained confirm a large reduction in the cogging force and an enhancement in the generator performance.
"This force is generated by interaction of the stator teeth and PM fixed on the shaft, even in the open-circuit case. This force is important because its peak value is dangerously high and thus it is one of the most important factors in the generator design . The LPMG has been simulated in the process of converting waves energy into electrical energy         , however a few researchers has paid attention to the cogging force reduction in the LPMG in LPMG, while decreasing this cogging force can considerably reduce the maintenance cost and lead to a longer life of the generator. "
[Show abstract][Hide abstract] ABSTRACT: In this paper a three-phase linear permanent magnet generator is designed for direct waves energy conversion. Its performance is then simulated using analytical and finite element method. Cogging force in this generator causes the oscillatory output power, shortens life time and increases the maintenance cost of the generator. Effects of design parameters including permanent magnet (PM) length, skewed stator teeth, radial PMs and use of stator semi-closed and open-slot on cogging force are investigated and results of simulations presented. The attempt is made to minimize this force by varying the above-mentioned design parameters. The reduction of cogging force includes: 80% by PM length reduction, 90% by a proper skewing angle and 34% by using semi-closed slots are shown.
") Figure 4. Eight-sided longitudinal flux machine Figure 3. One pole pair of an iron-cored tubular machine based on  Figure 2. One pole pair of a transverse flux machine with stationary magnets based on  Special Considerations "
[Show abstract][Hide abstract] ABSTRACT: The Archimedes Wave Swing (AWS) is a system that converts ocean wave energy into electric energy. The goal of the research described in this paper is to identify the most suitable generator type for this application. Of the more conventional generator types, the three-phase permanent-magnet synchronous generator with iron in both stator and translator is most suitable, because it is cheaper and more efficient than the induction generator, the switched reluctance generator and the permanent. magnet generator with air-gap winding. The paper also proposes a new transverse-flux permanent-magnet generator topology that could be suitable for this application. This new double double-sided TFPM generator has flux concentrators, magnets, and conductors on the stator, while the translator only consists of iron.
Electric Machines and Drives Conference, 2003. IEMDC'03. IEEE International; 07/2003
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