Reduction of Cogging Forces in a Double Sided Tubular Linear Permanent Magnet Generator Used for Ocean Wave Energy Conversion PDF Download
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Author: Rael Schmulian
Publisher:
ISBN:
Category : Ocean wave power
Languages : en
Pages : 116
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Author: Rael Schmulian
Publisher:
ISBN:
Category : Ocean wave power
Languages : en
Pages : 116
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Book Description
Author: Mihajlo Ljubomir Curcic
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The direct drive point absorber is a robust and efficient system for wave energy harvesting, where the linear generator represents the most complex part of the system. Therefore, its design and optimization are crucial tasks. The tubular shape of a linear generator's magnetic circuit offers better permanent magnet flux encapsulation and reduction in radial forces on the translator due to its symmetry. A double stator topology can improve the power density of the linear tubular machine. Common designs employ a set of aligned stators on each side of a translator with radially magnetized permanent magnets. Such designs require doubling the amount of permanent magnet material and lead to an increase in the cogging force. The design presented in this thesis utilizes a translator with buried axially magnetized magnets and axially shifted positioning of the two stators such that no additional magnetic material, compared to single side machine, is required. In addition to the conservation of magnetic material, a significant improvement in the cogging force occurs in the two phase topology, while the double sided three phase system produces more power at the cost of a small increase in the cogging force. The analytical and the FEM models of the generator are described and their results compared to the experimental results. In general, the experimental results compare favourably with theoretical predictions. However, the experimentally observed permanent magnet flux leakage in the double sided machine is larger than predicted theoretically, which can be justified by the limitations in the prototype fabrication and resulting deviations from the theoretical analysis.
Author: Joseph H. Prudell
Publisher:
ISBN:
Category : Electric current converters
Languages : en
Pages : 326
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Book Description
The world's energy consumption is growing at an alarming rate and the need for renewable energy is apparent now more than ever. Estimates have shown that optimization of the extraction of energy from the ocean could significantly aid the world's quest for sustainable and affordable energy services for all. From small power data buoys to generating power for coastal communities, everyone stands to benefit from the technological optimization of ocean wave energy devices. This thesis explores the design and implementation of a novel permanent magnet linear generator for direct drive ocean wave energy extraction point absorber buoys. The design optimizes the armature and magnet sections of a permanent magnet linear tubular generator (PMLTG) for the purposes of maximizing the energy conversion efficiency while minimizing cogging forces. Cogging forces in a linear generator influence power fluctuations and hydrodynamic performance of the wave energy extraction system. Implementation techniques involving the construction and mechanical design aspects are included.
Author: Omar Farrok
Publisher: Springer Nature
ISBN: 981999814X
Category :
Languages : en
Pages : 187
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Author: Danson Michael Joseph
Publisher:
ISBN:
Category : Wave resistance (Hydrodynamics)
Languages : en
Pages : 324
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Author: Aaron H. VanderMeulen
Publisher:
ISBN:
Category : Electric controllers
Languages : en
Pages : 230
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Book Description
Wave energy conversion devices are a rapidly growing interest worldwide for the potential to harness a sustainable and renewable energy source. Due to the oscillatory nature of ocean waves, the power generated from a permanent magnet linear generator (PMLG) for ocean wave energy conversion is pulsed. Focusing on direct drive technology, the PMLG directly translates the motion of the waves into electrical energy. The power generated, left unconditioned, is not easily used or stored. With conventional diode rectification topologies, line currents can not be controlled easily, resulting in an uncontrolled generator output and force. With an active rectifier topology, the real and reactive power from the PMLG is fully controllable. This thesis will investigate the generator modeling and design of a novel three-phase active rectifier topology and force controller with a dc-dc converter for bus voltage regulation. An in depth analysis for the controller design and simulations are presented. Hardware for the three-phase active rectifier is specified and built with initial lab test results. The controller design is implemented with National Instruments0́9 LabView and compiled on a CompactRIO real-time controller.
Author: Oskar Danielsson
Publisher:
ISBN: 9789155466831
Category :
Languages : en
Pages : 102
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Author: Nikola Gargov
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jennifer Vining
Publisher:
ISBN:
Category :
Languages : en
Pages : 269
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Author: Sanjida Moury
Publisher:
ISBN:
Category :
Languages : en
Pages : 182
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