Comparison of Direct Drive Hydraulic and Dual-Stator Spoke Array Vernier Permanent Magnet Machines For Ocean Wave Energy Conversion PDF Download
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Author: Ridwan Azam
Publisher:
ISBN:
Category : Ocean wave power
Languages : en
Pages : 26
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Book Description
Recently, there has been peaked interest in developing high energy producing and optimized power take-off topologies for Wave Energy Converters (WEC). As large as the potential of the oceans may seem, harnessing that energy and effectively converting it to electricity in significant amounts is a challenge. Currently, there are no single devices that satisfy this sufficiently. In this thesis we compare two promising Power Take-Off (PTO) units; the Dual-Stator Spoke Array Vernier Permanent Magnet machine (DSSA VPM) and the Direct Drive Hydraulic Power Take-Off (DDHPTO). A steady state and transient analysis is done to compare the efficiencies of the two machines. The results will show that the DSSA VPM has the higher efficiency and a greater Annual Energy Production (AEP) over the DDHPTO.
Author: Ridwan Azam
Publisher:
ISBN:
Category : Ocean wave power
Languages : en
Pages : 26
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Book Description
Recently, there has been peaked interest in developing high energy producing and optimized power take-off topologies for Wave Energy Converters (WEC). As large as the potential of the oceans may seem, harnessing that energy and effectively converting it to electricity in significant amounts is a challenge. Currently, there are no single devices that satisfy this sufficiently. In this thesis we compare two promising Power Take-Off (PTO) units; the Dual-Stator Spoke Array Vernier Permanent Magnet machine (DSSA VPM) and the Direct Drive Hydraulic Power Take-Off (DDHPTO). A steady state and transient analysis is done to compare the efficiencies of the two machines. The results will show that the DSSA VPM has the higher efficiency and a greater Annual Energy Production (AEP) over the DDHPTO.
Author: Sandra Eriksson
Publisher: MDPI
ISBN: 3039213504
Category : Technology & Engineering
Languages : en
Pages : 282
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Book Description
Interest in permanent magnet synchronous machines (PMSMs) is continuously increasing worldwide, especially with the increased use of renewable energy and the electrification of transports. This book contains the successful submissions of fifteen papers to a Special Issue of Energies on the subject area of “Permanent Magnet Synchronous Machines”. The focus is on permanent magnet synchronous machines and the electrical systems they are connected to. The presented work represents a wide range of areas. Studies of control systems, both for permanent magnet synchronous machines and for brushless DC motors, are presented and experimentally verified. Design studies of generators for wind power, wave power and hydro power are presented. Finite element method simulations and analytical design methods are used. The presented studies represent several of the different research fields on permanent magnet machines and electric drives.
Author: Wenbo Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This thesis investigates Vernier permanent magnet (PM) machines utilizing a new alternating rotor leakage flux blocking design for low speed high torque direct drive systems, such as industrial cooling fans and wind turbines. The innovation can be applied to a family of PM machines with various rotor structures such as: spoke type, V-shape. The proposed topology utilizes only a single stator and rotor and has much higher torque density compared to a normal design. Low remanence material (such as ferrite magnets) can be used due to the flux focusing effect enabled by the adoption of spoke type structure. The proposed structure is simpler compared to competitive double excitation or double rotor designs. The structure not only brings down the manufacturing complexity but also improves the machine mechanical integrity. In addition, it bridges the gap between academic research and the possibility of industry adoption. Due to the Vernier machine's short development history and peculiar features, researchers have reached various conclusions through different interpretations, many of which have limited physical insight. Thus, this work targets on developing a systematic analysis for the working mechanisms for Vernier PM machines, starting with derivations of generic single layer winding function and airgap originated flux modulation effects, upon which closed-form expressions for back-EMF induction and torque production are also developed. The analytical models are built and compared for both conventional synchronous machine and Vernier PM machine, through which the Vernier PM machine is identified as a synchronous machine utilizing flux modulation effects. Some key design parameters for Vernier PM machine are identified in the model, by associating them to terms such as gearing coefficient and equivalent winding factor, a true physics-based model is established which can be readily merged with the existing machine design knowledge. Furthermore, an optimum design space is located through analytical model based parametric study and verified by finite element analysis (FEA). Prototype machines are designed and built for V-shape structure using rare earth magnet, the prototype machines are characterized in the experiment, and the results of which are in good agreement with FEA predications and analytical model. The experimental results have demonstrated that the V-shape Vernier PM machine achieved a good balance between performance, cost and manufacturing complexity, the design is suitable for low speed high torque direct drive application.
Author: Jian Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 227
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Book Description
The work presented in this thesis concerns the study of sizing, optimization and control of double stator permanent magnet generator (DSCRPMG) system for tidal current energy application. Turbine concepts, relative projects and usual chain of tidal energy conversion are first presented. A direct drive system with fixed pitch turbine is used. The analytical model of the DSCRPMG is developed and different control strategies are tested (unity power factor control, constant flux and maximum torque per ampere control). An original approach minimizing both losses of the machine and the converter is proposed, leading to improve the system efficiency over the whole speed range (MPPT and flux weakening regions) taking into account voltage and thermal constraints. A multi-objective optimization of investment and energy extracted by the entire conversion chain is performed for an operating period of 20 years, taking into account the occurrence of the sea current speed probabilities. As a result, the double stator machine gives a clear improvement in torque density despite a slight degradation of the mass torque compared to the conventional single stator synchronous machine. Finally emphasis is placed on the control of the conversion chain under normal mode or fault conditions, particularly for open circuit fault of the outer stator. Different strategies are designed to ensure continuity of service and minimize torque ripples, showing the possibilities offered by the DSCRPMG.
Author: Mihajlo Ljubomir Curcic
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: Xiaogang Luo
Publisher:
ISBN:
Category :
Languages : en
Pages : 376
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Book Description
Author: Kai Wang
Publisher: Springer
ISBN: 981130629X
Category : Technology & Engineering
Languages : en
Pages : 216
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Book Description
This book investigates the utilization of harmonics in the permanent magnet (PM) or rotor shape to improve the torque density of PM brushless AC machines including three-phase inner rotor and outer rotor machines, five-phase machines, dual three-phase machines, linear machines, by means of analytical, finite element analyses, and as well as experimental validation. The torque density can be improved while the torque ripple remains low in PM shaping utilizing the 3rd harmonic. In this book, the analytical expression of output torque is derived for PM machines with rotor shape using the 3rd harmonic, and then the optimal 3rd harmonic for maximizing torque is analytically obtained. The book compares the PM shape in surface-mounted PM (SPM) machines and the rotor lamination shape in interior PM (IPM) machines utilizing the 3rd harmonic, and it becomes clear that their shaping methods and amount of torque improvement are different. In a five-phase PM machine, the 3rd harmonic can be utilized in both the current waveform and PM shapes to further improve the output torque. For the dual three-phase SPM machines without deteriorating the torque more than 30% when the optimal 3rd harmonic into both the current and PM shape are injected. The harmonics in airgap flux density have significant influence on the cogging torque, stator iron flux distribution, and radial force between the rotor and stator. These effects has been investigated as well in this book.
Author: Jacek F. Gieras
Publisher: Springer Science & Business Media
ISBN: 9781402026614
Category : Technology & Engineering
Languages : en
Pages : 360
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Book Description
Axial Flux Permanent Magnet (AFPM) brushless machines are modern electrical machines with a lot of advantageous merits over their conventional counterparts. They are increasingly used in power generation, domestic appliances, industrial drives, electric vehicles, and marine propulsion drives and many other applications. This book deals with the analysis, construction, design, optimisation, control and applications of AFPM machines. The authors present their own research results, as well as significant research contributions made by others. This monograph will be of interest to electrical engineers and other engineers involved in the design and application of AFPM brushless machine drives. It will be an important resource for researchers and graduate students in the field of electrical machine and drives.
Author: Richard Carson Crozier
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Sandra Eriksson
Publisher:
ISBN: 9783039213511
Category : Electronic books
Languages : en
Pages : 1
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Book Description
Interest in permanent magnet synchronous machines (PMSMs) is continuously increasing worldwide, especially with the increased use of renewable energy and the electrification of transports. This book contains the successful submissions of fifteen papers to a Special Issue of Energies on the subject area of "Permanent Magnet Synchronous Machines". The focus is on permanent magnet synchronous machines and the electrical systems they are connected to. The presented work represents a wide range of areas. Studies of control systems, both for permanent magnet synchronous machines and for brushless DC motors, are presented and experimentally verified. Design studies of generators for wind power, wave power and hydro power are presented. Finite element method simulations and analytical design methods are used. The presented studies represent several of the different research fields on permanent magnet machines and electric drives.
