Calculation of Iron Loss in Electrical Generators Using Finite-Element Analysis

Hargreaves, P. A.; Mecrow, B.C.; Hall, R.

doi:10.1109/tia.2012.2209851

Cited by 62 publications

(21 citation statements)

References 17 publications

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“…These can be broadly categorized into three groups: separation of core loss components, macroscopic energy or statistical domain wall calculations, and empirical calculations. That said, the former two groups require parameters not readily provided by core manufacturers, complicating their use [23][24][25].…”

Section: Core Lossesmentioning

confidence: 99%

Hybrid, Multi-Megawatt HVDC Transformer Topology Comparison for Future Offshore Wind Farms

Smailes

McKeever

et al. 2017

Energies

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With the wind industry moving further offshore, High Voltage Direct Current (HVDC) transmission is becoming increasingly popular. HVDC transformer substations are not optimized for the offshore industry though, increasing costs and reducing redundancy. A suggested medium frequency, modular hybrid HVDC transformer located within each wind turbine nacelle could mitigate these problems, but the overall design must be considered carefully to minimize losses. This paper's contribution is a detailed analysis of the hybrid transformer, using practical design considerations including component library minimization. The configurations investigated include combinations of single phase H-Bridge and Modular Multilevel Converter topologies operating under minimum switching frequency control strategies. These were modelled in the MATLAB/Simulink environment. The impact of the minimum switching control strategy and converter topology on power transfer stability and overall efficiency is then investigated. It was found that the H-Bridge converter generated the lowest overall losses, but there was a trade off with power flow sensitivity due in part to the additional harmonics generated.

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Section: Core Lossesmentioning

confidence: 99%

Hybrid, Multi-Megawatt HVDC Transformer Topology Comparison for Future Offshore Wind Farms

Smailes

McKeever

et al. 2017

Energies

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“…Moreover, the methods used to calculate iron losses have to be adapted [11]. In the distributed windings, the Finite Elements Method is used as a regular method and some researchers have used this method and have investigated the impact of rotational magnetic fields in these machines [32]. As the rotational behavior does not significantly alter the iron losses calculation, the regular method has not been enhanced.…”

Section: Concentrated Winding and Flux Circulation In The Statormentioning

confidence: 99%

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Barre¹,

Napame

2016

Machines

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Abstract:In electric power generation, customers want generators with high efficiency. Nowadays, modern turbo-generators have efficiencies greater than 98%. Although this amount should not be obtained for all kind of machines, efficiency will remain one of the main parameters for customer choice. Efficiency is also linked to the life of the machine: the higher the efficiency is, the longer the machine's lifetime. During the past decade, new forms of energy production have appeared and generators have been developed to fit well into this market. For example, wind generators evolved towards permanent magnet generators having high polarity and running at low speed. Nevertheless, their structure is not fixed. An industrial company has built a prototype of such a generator which uses fractional-slot concentrated-windings (FSCW). This kind of winding is not the structure used by default in such electrical machines. Another field of interest is in autonomous generators which can be used on boats. Even if everyone has in mind large merchant ships, we must not forget smaller ships, such as fishing boats and short-range cruise ships, which spend the most of their time near the coast. This kind of ship does nothave large areas for installing the electric generation or the electric propulsion. It is the reason why, in this article, we focus on the efficiency of machines using fractional-slot concentrated-windings. In many publications which compare performances between distributed and concentrated windings, the result is almost the same. The efficiency of FSCW is not as high as the efficiency associated to the machines which are using distributed windings. Design methods have to be redrawn to integrate, as soon as possible, the loss mitigation in order to provide the best efficiency in power conversion. The following discussion, step by step, introduces the loss mitigation in every part of a machine using FSCW. To close the discussion, a design is produced and it appears that efficiency can be enhanced with suitable design methods.

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“…Finally, the iron losses occurred in the iron cores are estimated by using FEM. Although it remains a large challenges for the accurate calculation of iron loss in electric machines [20,21], we are still able to make a comparison between the initial case and the optimum case, and calculate the iron loss in the one which is bigger than that in the other, by using numerical calculations. The classical method to calculate iron loss is given by the following Bertotti's equation [20]:…”

Section: Performance Analysismentioning

confidence: 99%

Design Optimization and Analysis of a Dual-Permanent-Magnet-Excited Machine Using Response Surface Methodology

et al. 2015

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Abstract:The dual-permanent-magnet-excited (DPME) machine employs permanent magnets (PMs) both on the stator and the rotor. It relies on the bi-directional field modulation effect (BFME) to achieve stable electromechanical energy conversion. Therefore, this new type of machine is capable of offering much higher torque capability than its traditional counterparts. This paper is devoted to investigating the optimum design method for improving the BFME of DPME machines, so as to further improve their produced electromagnetic torques. Response surface methodology is engaged to investigate the impacts of shape factors of the stator and rotor slots on the torque capability of the DPME machine, and the fitted models are built up by using both the finite element method (FEM) and the least-squares method. After that, the optimum shape factors are obtained from the fitted models. The results estimated by using both two-dimensional (2D)-FEM and three-dimensional (3D)-FEM demonstrate that the pull-out torque of the optimum case is 24.5% larger than that of the initial case, while the usage of PM material of the optimum case is 8.9% less than that of the initial case.Keywords: dual permanent magnet excited machine; bi-directional field modulation effect; optimum design; torque density; low-speed large-torque; direct drive; response surface methodology; finite element method OPEN ACCESSEnergies 2015, 8 10128

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Calculation of Iron Loss in Electrical Generators Using Finite-Element Analysis

Cited by 62 publications

References 17 publications

Hybrid, Multi-Megawatt HVDC Transformer Topology Comparison for Future Offshore Wind Farms

Hybrid, Multi-Megawatt HVDC Transformer Topology Comparison for Future Offshore Wind Farms

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Design Optimization and Analysis of a Dual-Permanent-Magnet-Excited Machine Using Response Surface Methodology

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