Numerical analysis of permanent magnet DC motor performances

Craiu, Ovidiu; Dan, Nguyen Huy; Badea, E.A.

doi:10.1109/20.489549

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…The electromagnetic field inside the generator is modelled as a two-dimensional problem. This is a common simplification in radial flux machines [20]. However, if the axial length of the generator is smaller than the diameter of the generator end effects should be taken into account.…”

Section: Theory and Modelling Detailsmentioning

confidence: 99%

A low-speed generator for energy conversion from marine currents — experimental validation of simulations

Thomas

Grabbe

Yuen

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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Abstract:A low-speed permanent magnet (PM) cable wound generator for electrical energy conversion from marine or tidal currents has been designed and constructed. A key feature of this variable speed direct drive generator is its capability to efficiently generate electricity from tidal currents with very low velocities, in the order of 1 m/s. In arriving at an appropriate design for the generator typical characteristics of tidal currents were considered. Using these characteristics as input, and accounting for the electromagnetic losses, detailed computer simulations using a finite-element method software were carried out to come up with the final design. Various parameters that can influence the generator design are presented.An experimental set-up has been constructed based on the above-mentioned design in order to study the electrical and mechanical performance of the generator through a variety of experiments. The power input for this set-up is a variable speed motor, capable of operating the generator at rotational speeds of 0-16 r/min, representing tidal currents with very low velocities. The generator presented in this paper may be beneficial for a better understanding of an appropriate design and layout of tidal energy conversion systems.

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Section: Theory and Modelling Detailsmentioning

confidence: 99%

A low-speed generator for energy conversion from marine currents — experimental validation of simulations

Thomas

Grabbe

Yuen

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…In the used model, the magnetic field in the core region of the generator is assumed to be two dimensional. This is a common simplification in longitudinal flux machines (Craiu et al, 1995). The laminated iron core in the stator is treated as a magnetically nonlinear material with a single-valued magnetization curve.…”

Section: Coupled Field and Circuit Modelmentioning

confidence: 99%

Study of a longitudinal flux permanent magnet linear generator for wave energy converters

Danielsson

Eriksson

Leijon

2006

Int. J. Energy Res.

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SUMMARYA directly coupled linear permanent magnet generator of longitudinal flux-type is investigated. The generator will be used for power take-off in a wave energy converter. A combined field-and circuit model, solved by a time stepping finite element technique, is used to model and analyse the electromagnetic behaviour of the machine. A large number of simulations form the basis of a design study where the influence of armature current level, number of cables per slot, and pole width is investigated with respect to efficiency, generator size, and the load angle. A case study is performed for a chosen generator design. The electromagnetic behaviour is examined both for nominal load and for overloads. The generator has a nominal output power of 10 kW for a constant piston speed of 0.7 m s À1. The electromagnetic efficiency at nominal load is 86.0%, the load angle 6.68, and the power fluctuation 1.3%. At 300% overload the load angle barely exceeds 128 and the cable temperature is below 258C provided that the stator back is thermally connected to the sea water. The numerical calculations have been verified for small speeds by experiments.

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“…A magnetic vector potential, A, is used in Maxwell's equations and the contribution from displacement currents is neglected. As described in [48], the time-dependent induced eddy currents are removed for a steady state simulation, resulting in:…”

Section: Theory and Methodsmentioning

confidence: 99%

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

et al. 2017

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The wave energy converter (WEC) studied and developed at Uppsala University in Sweden is a point absorbing buoy connected to a linear generator (LG) on the seabed. Previous studies have improved the sustainability of the generator, changing its magnets from Nd 2 Fe 14 B-magnets to ferrites. In this paper, the magnetic circuit of the linear generator is further studied. Ferrite magnets of two different types (Y30 and Y40) are studied along with different shapes of pole shoes for the system. The finite element method (FEM) simulations in a program called Ace are performed. The results show that a linear generator including both Y30 and Y40 magnets and shortened T-shaped pole shoes can generate a similar magnetic energy in the airgap as a linear generator only containing Y40 magnets and rectangular pole shoes. This shows that the magnetic circuit can be altered, opening up sizes and strengths of magnets for different retailers, and thereby possibly lowering magnet cost and transportation. This work was previously presented as a conference at the European Wave and Tidal Energy Conference (EWTEC) 2017 in Cork, Ireland; this manuscript has been carefully revised and some discussions, on magnet costs for example, have been added to this paper.

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Numerical analysis of permanent magnet DC motor performances

Cited by 14 publications

References 3 publications

A low-speed generator for energy conversion from marine currents — experimental validation of simulations

A low-speed generator for energy conversion from marine currents — experimental validation of simulations

Study of a longitudinal flux permanent magnet linear generator for wave energy converters

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

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