document

Quantum control for an experimental contactless energy transfer system for multiple users

Van der Pijl, F.F.A. (author), Bauer, P. (author), Ferreira, J.A. (author), Polinder, H. (author)

conference paper 2007

document

Possible Solutions to Overcome Drawbacks of Direct-Drive Generator for Large Wind Turbines

Bang, D. (author), Polinder, H. (author), Shrestha, G. (author), Ferreira, J.A. (author)

conference paper 2009

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Investigation on the Possible Use of Magnetic Bearings in Large Direct Drive Wind Turbines

Shrestha, G. (author), Polinder, H. (author), Bang, D. (author), Jassal, A.K. (author), Ferreira, J.A. (author)

A direct drive generator used in wind turbine has high energy yield compared to other drivetrain topologies and low maintenance is expected as the technology matures. On the other hand direct drive generator weight and size increases rapidly when scaled up to larger units. This paper will investigate the possibility of weight reduction of large...

conference paper 2009

document

The electrical demand by transport on the grid after oil depletion

J.J. Wolmarans, J.J. (author), Ferreira, J.A. (author)

At the hand of a case study alternative energy sources, methods of transportation and their effect on the electricity grid oncefossilfuels have been depleted is discussed. Three methods of sustainable transport are presented. The energy requirement for each is calculated as well as the requirements from the electricity grid for traveling a 200km...

conference paper 2007

document

Extension of Knuth's balancing algorithm with error correction

Weber, J.H. (author), Schouhamer Immink, K.A. (author), Ferreira, H.C. (author)

Knuth's celebrated balancing method consists of inverting the first z bits in a binary information sequence, such that the resulting sequence has as many ones as zeroes, and communicating the index z to the receiver through a short balanced prefix. In the proposed method, Knuth's scheme is extended with error-correcting capabilities, where it is...

conference paper 2011

document

Control of DFIG under unsymmetrical voltage dip

Zhou, Y. (author), Bauer, P. (author), Ferreira, J.A., Pierik, J. (author)

conference paper 2007

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Design towards higher integration levels in power electronics

de Jong, E.C.W. (author), Popovic, J. (author), Ferreira, J.A. (author)

conference paper 2006

document

Design Challenges and Potentials of HTS Synchronous Motor for Superbus

Ani, S.O. (author), Polinder, H. (author), Ferreira, J.A. (author), Ockels, W.J. (author)

This paper discusses the possibilities of applying high temperature superconducting (HTS) synchronous motor to Superbus, an alternative and sustainable type of public transportation developed at TU Delft. Two important factors within the Superbus drive that influence the operating range are weight and efficiency: increasing the weight results in...

conference paper 2009

document

Direct drive wind turbine generator with magnetic bearing

Shrestha, G. (author), Polinder, H. (author), Bang, D.J. (author), Ferreira, J.A. (author)

conference paper 2007

document

Rotor losses in laminated magnets and an anisotropic carbon fiber sleeve

Van der Geest, M. (author), Wolmarans, J.J. (author), Polinder, H. (author), Ferreira, J.A. (author), Zeilstra, D. (author)

High speed fault tolerant permanent magnet machines have strong asynchronous airgap harmonics, making them susceptible to rotor eddy-current losses. These losses can be reduced by using novel high resistivity materials like plastic bonded magnets and carbon fiber reinforced retaining sleeves. This paper examines by numerical studies the...

conference paper 2012

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Grid-connected and islanded operation of a hybrid power system

Zhou, Y. (author), Ferreira, J.A. (author), Bauer, P. (author)

conference paper 2007

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Usability in virtual and augmented environments: A qualitative and quantitative study

Dias, P. (author), Pimentel, A. (author), Ferreira, C. (author), Van Huussen, F. (author), Baggerman, J.W. (author), Van der Horst, P. (author), Madeira, J. (author), Bidarra, R. (author), Sousa Santos, B. (author)

Virtual and Augmented Reality are developing rapidly: there is a multitude of environments and experiments in several laboratories using from simple HMD (Head-Mounted Display) visualization to more complex and expensive 6-wall projection CAVEs, and other systems. Still, there is not yet a clear emerging technology in this area, nor commercial...

conference paper 2007

document

New bearingless generator with buoyant rotor for large direct-drive wind turbines

Bang, D. (author), Jang, G.W. (author), Hwang, S.H. (author), Han, P.W. (author), Kim, J.W. (author), Koo, D.H. (author), Polinder, H. (author), Ferreira, J.A. (author)

conference paper 2014

document

Toward the Next Level of PCB Usage in Power Electronic Converters

De Jong, E.C.W. (author), Ferreira, B.J.A. (author), Bauer, P. (author)

A means for power electronics to exploit the level of 3-D packaging already being implemented in compact consumer products, such as digital cameras, is investigated in order to increase its power density. The increase in functionality and usage of printed circuit board (PCB) in power electronic converters is highlighted and improvements proposed...

journal article 2008

document

Operation of grid-connected DFIG under unbalanced grid voltage condition

Zhou, Y. (author), Bauer, P. (author), Ferreira, J.A. (author), Pierik, J. (author)

Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent...

journal article 2009

document

Analytical modeling of a permanent-magnet synchronous machine in a flywheel

Holm, S.R. (author), Polinder, H. (author), Ferreira, J.A. (author)

journal article 2007

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Coupling of a CMOS Optical Sensor to a Micromachined Deformable Mirror with an Adaline Neural Method

De Lima Monteiro, D.W. (author), Ferreira, A.I. (author), Teixeira, F.B. (author), Melo, J.G.M. (author), Vdovin, G.V. (author)

We report on the preliminary results of an Adaline neural method for the coupling of a custom CMOS wavefront sensor to a micromachined adaptive mirror. The algorithm does not rely on a fixed basis matrix -as opposed to traditional methods-, offers excellent immunity to round-off errors and admits real-time input adaptability to speed up...

journal article 2006

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The electric variable transmission

Hoeijmakers, M.J. (author), Ferreira, J.A. (author)

journal article 2006

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Efficient gradient coil driver for MRI

Bauer, P. (author), Spanjaard, S. (author), Ferreira, J.A. (author), Hollander, M. (author)

journal article 2007

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A high-density heat-sink-mounted inductor for automotive applications

Gerber, M. (author), Ferreira, J.A. (author), Hofsajer, I.W. (author), Seliger, N. (author)

journal article 2004