Design of Transverse Flux Permanent Magnet Machines for Large Direct-drive Wind Turbines PDF Download
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Author: Deok-je Bang
Publisher:
ISBN: 9789053353363
Category :
Languages : en
Pages :
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Book Description
Author: Deok-je Bang
Publisher:
ISBN: 9789053353363
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This paper presents the design considerations of a double-sided transverse flux machine (TFM) for direct-drive wind turbine applications. The TFM has a modular structure with quasi-U stator cores and ring windings. The rotor is constructed with ferrite magnets in a flux-concentrating arrangement to achieve high air gap flux density. The design considerations for this TFM with respect to initial sizing, pole number selection, key design ratios, and pole shaping are presented in this paper. Pole number selection is critical in the design process of a TFM because it affects both the torque density and power factor under fixed magnetic and changing electrical loading. Several key design ratios are introduced to facilitate the design procedure. The effect of pole shaping on back-emf and inductance is also analyzed. These investigations provide guidance toward the required design of a TFM for direct-drive applications. The analyses are carried out using analytical and three-dimensional finite element analysis. A prototype is under construction for experimental verification.
Author: Markus Mueller
Publisher: Elsevier
ISBN: 0857097490
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
Wind turbine gearboxes present major reliability issues, leading to great interest in the current development of gearless direct-drive wind energy systems. Offering high reliability, high efficiency and low maintenance, developments in these direct-drive systems point the way to the next generation of wind power, and Electrical drives for direct drive renewable energy systems is an authoritative guide to their design, development and operation.Part one outlines electrical drive technology, beginning with an overview of electrical generators for direct drive systems. Principles of electrical design for permanent magnet generators are discussed, followed by electrical, thermal and structural generator design and systems integration. A review of power electronic converter technology and power electronic converter systems for direct drive renewable energy applications is then conducted. Part two then focuses on wind and marine applications, beginning with a commercial overview of wind turbine drive systems and an introduction to direct drive wave energy conversion systems. The commercial application of these technologies is investigated via case studies on the permanent magnet direct drive generator in the Zephyros wind turbine, and the Archimedes Wave Swing (AWS) direct drive wave energy pilot plant. Finally, the book concludes by exploring the application of high-temperature superconducting machines to direct drive renewable energy systems.With its distinguished editors and international team of expert contributors, Electrical drives for direct drive renewable energy systems provides a comprehensive review of key technologies for anyone involved with or interested in the design, construction, operation, development and optimisation of direct drive wind and marine energy systems. - An authorative guide to the design, development and operation of gearless direct drives - Discusses the principles of electrical design for permanent magnet generators and electrical, thermal and structural generator design and systems integration - Investigates the commercial applications of wind turbine drive systems
Author: Hayagrish Balaji
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"With the ever-growing need to generate electrical power from renewable sources of energy, wind turbines have been receiving a lot of attention due to their high generation and continuous output of power. While they carry a lot of advantages, one of the main obstacles for implementation is the area and size of the wind turbine that can cause installation issues in urban areas. This prevents engineers to erect wind turbines in urban areas and spend more money on transmitting power from a distant generation site. As residential, commercial, and industrial loads increase, the demand for power also increases. In order to satisfy the energy requirement of the power-generating stations, small-scale wind turbines or mini-wind turbines in large numbers can be erected in urban areas, allowing power generated from the smaller units to be either used for satisfying consumer loads or providing it to the power grid for increasing the surplus of energy in the power grid itself. The installation of small-sized wind generators in higher numbers across urban cities would solve the power demand issue. When consumers install mini-wind turbines, their recurring payments to the utility grid also decrease, thereby reducing the overall costs in the long term. In this thesis, An Axial Flux Permanent Magnet Generator (AFPG) is utilized as the wind turbine's generator instead of the more popular option - Brushless Direct Current (BLDC) generators. BLDC generators are not ideal generators for use in large wind turbine systems. DC machines are more suitable for use as DC generators but due to size constraints, they are not practical for use. In this research, a 3-Phase Axial Flux Permanent Magnet Generator is to be designed and the performance characteristics of the machine will be analyzed such that it would be suitable as an alternative for existing wind turbine-generator units. With the world moving towards enhancing the performance of existing generators, this thesis is geared towards designing a new type of generator that was theorized several decades ago and has the potential to replace popular types of machines used in wind turbines today. This thesis also explains the ways in which mini-wind turbine units' energy could be converted and stored in order to satisfy residential loads"--
Author: Zhao Wan
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
Author: Liu, Yingzhen
Publisher: KIT Scientific Publishing
ISBN: 373150796X
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
The trend towards larger power ratings of wind turbines asks for innovations in power generation, which requires lower weight and cost, smaller size, higher efficiency and reliability. Due to high current-carrying capability and no DC losses of superconductors, a superconducting wind generator can have a superior power to weight/volume ratio with high efficiency. The work in the book mainly focuses on the feasibility study and design of a superconducting DC wind generator.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Permanent-magnet generators have been used for wind turbines for many years. Many small wind turbine manufacturers use direct-drive permanent-magnet generators. For wind turbine generators, the design philosophy must cover the following characteristics: low cost, light weight, low speed, high torque, and variable speed generation. The generator is easy to manufacture and the design can be scaled up for a larger size without major retooling. A modular permanent-magnet generator with axial flux direction was chosen. The permanent magnet used is NdFeB or ferrite magnet with flux guide to focus flux density in the air gap. Each unit module of the generator may consist of one, two, or more phases. Each generator can be expanded to two or more unit modules. Each unit module is built from simple modular poles. The stator winding is formed like a torus. Thus, the assembly process is simplified and the winding insertion in the slot is less tedious. The authors built a prototype of one unit module and performed preliminary tests in the laboratory. Follow up tests will be conducted in the lab to improve the design.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This paper presents a nonlinear analytical model of a novel double-sided flux concentrating Transverse Flux Machine (TFM) based on the Magnetic Equivalent Circuit (MEC) model. The analytical model uses a series-parallel combination of flux tubes to predict the flux paths through different parts of the machine including air gaps, permanent magnets, stator, and rotor. The two-dimensional MEC model approximates the complex three-dimensional flux paths of the TFM and includes the effects of magnetic saturation. The model is capable of adapting to any geometry that makes it a good alternative for evaluating prospective designs of TFM compared to finite element solvers that are numerically intensive and require more computation time. A single-phase, 1-kW, 400-rpm machine is analytically modeled, and its resulting flux distribution, no-load EMF, and torque are verified with finite element analysis. The results are found to be in agreement, with less than 5% error, while reducing the computation time by 25 times.
Author:
Publisher: EWEA
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
Author: Iftekhar Hasan
Publisher:
ISBN:
Category : Electric machines
Languages : en
Pages : 125
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Book Description
Commercially available permanent magnet synchronous machines (PMSM) typically use rare-earth-based permanent magnets (PM). However, volatility and uncertainty associated with the supply and cost of rare-earth magnets have caused a push for increased research into the development of non-rare-earth based PM machines and reluctance machines. Compared to other PMSM topologies, the Transverse Flux Machine (TFM) is a promising candidate to get higher torque densities at low speed for direct-drive applications, using non-rare-earth based PMs. The TFMs can be designed with a very small pole pitch which allows them to attain higher force density than conventional radial flux machines (RFM) and axial flux machines (AFM).This dissertation presents the modeling, electromagnetic design, vibration analysis, and prototype development of a novel non-rare-earth based PM-TFM for a direct-drive wind turbine application. The proposed TFM addresses the issues of low power factor, cogging torque, and torque ripple during the electromagnetic design phase.An improved Magnetic Equivalent Circuit (MEC) based analytical model was developed as an alternative to the time-consuming 3D Finite Element Analysis (FEA) for faster electromagnetic analysis of the TFM. The accuracy and reliability of the MEC model were verified, both with 3D-FEA and experimental results. The improved MEC model was integrated with a Particle Swarm Optimization (PSO) algorithm to further enhance the capability of the analytical tool for performing rigorous optimization of performance-sensitive machine design parameters to extract the highest torque density for rated speed.A novel concept of integrating the rotary transformer within the proposed TFM design was explored to completely eliminate the use of magnets from the TFM. While keeping the same machine envelope, and without changing the stator or rotor cores, the primary and secondary of a rotary transformer were embedded into the double-sided TFM. The proposed structure allowed for improved flux-weakening capabilities of the TFM for wide speed operations.The electromagnetic design feature of stator pole shaping was used to address the issue of cogging torque and torque ripple in 3-phase TFM. The slant-pole tooth-face in the stator showed significant improvements in cogging torque and torque ripple performance during the 3-phase FEA analysis of the TFM. A detailed structural analysis for the proposed TFM was done prior to the prototype development to validate the structural integrity of the TFM design at rated and maximum speed operation. Vibration performance of the TFM was investigated to determine the structural performance of the TFM under resonance.The prototype for the proposed TFM was developed at the Alternative Energy Laboratory of the University of Akron. The working prototype is a testament to the feasibility of developing and implementing the novel TFM design proposed in this research. Experiments were performed to validate the 3D-FEA electromagnetic and vibration performance result.
