Publicaties
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Design, implementation and performance analysis of shunt active filter based on a matrix converter Universiteit Gent
Mathematical modelling, analysis and control of a three to five-phase matrix converter for minimal switching losses Universiteit Gent
Performance analysis of inverter fed from wind energy system Universiteit Gent
The effect of common-mode voltage elimination on the iron loss in machine core laminations of multilevel drives Universiteit Gent
This paper studies the effect of common-mode voltage elimination (CMVE) on the iron loss of electrical machine core laminations under multilevel converter supply. Three identical magnetic ring cores are excited by either a three-level converter or a five-level voltage source converter to study the behavior of CMVE on a three-phase system. Both multilevel converters are controlled by using a space vector pulsewidth modulation as it is one of the ...
$LiZnNb_{4}O_{11.5}$ Universiteit Antwerpen
A novel lithium zinc niobium oxide LiZnNb(4)O(11.5) (LZNO) has been found in the Nb-rich part of Li(2)O-ZnO-Nb(2)O(5) system. LZNO, with an original alpha-PbO(2) related structure, has been synthesized by the routine ceramic technique and characterized by X-ray diffraction and transmission electron microscopy (TEM). Reflections belonging to the LZNO phase, observed in X-ray powder diffraction (XRPD) and electron diffraction, have been indexed as ...
K₅Eu(MoO₄)₄ red phosphor for solid state lighting applications, prepared by different techniques Universiteit Antwerpen
The influence of preparation techniques on the structure and luminescent properties of K5Eu(MoO4)(4) (KEMO) was investigated. KEMO phosphors were synthesized by three different techniques: solid state and sol-gel (sg) methods as well as the Czochralski (CZ) crystal growth technique. Laboratory powder X-ray diffraction (PXRD) studies revealed that all KEMO samples had a structure analogous to that of other high temperature alpha-K5R(MoO4)(4) ...
Competing magnetic structures and the evolution of copper ion/vacancy ordering with composition in the manganite oxide chalcogenides $Sr_{2}MnO_{2}Cu_{1.5}(S_{1-x}Se_{x})_{2}$ Universiteit Antwerpen
The series Sr2MnO2Cu1.5(S1-xSex)(2) (0 <= x <= 1) contains mixed-valent Mn ions (Mn2+/Mn3+) in MnO2 sheets which are separated by copper-deficient antifluorite-type Cu(2-delta)Ch(2) layers with delta similar to 0.5. The compounds crystallize in the structure type first described for Sr2Mn3Sb2O2 and are described in the I4/mmm space group at ambient temperatures. Below about 250 K, ordering between Cu+ ions and tetrahedral vacancies occurs ...
Improving performance of three-phase slim DC-link drives utilizing virtual positive impedance-based active damping control Vrije Universiteit Brussel
In this paper, a virtual positive impedance (VPI) based active damping control for a slim DC-link motor drive with 24 section space vector pulse width modulation (SVPWM) is proposed. Utilizing the proposed control and modulation strategy can improve the input of current total harmonic distortion (THD) while maintaining the cogging torque of the motor. The proposed system is expected to reduce the front-end current THD according to ...
A layered iron-rich 2234-type with a mixed valence of iron: the ferrimagnetic Tl-doped $Fe_{2}(Sr_{2-\varepsilon}Tl_{\varepsilon})Sr_{3}Fe_{4}O_{14.65}$ Universiteit Antwerpen
A new Tl-doped strontium ferrite Fe2(Sr2-Tl)Sr3Fe4O14.65, with an original structure, has been synthesized and structurally characterized by powder X-ray diffraction and transmission electron microscopy. The TGA and Mssbauer studies evidence a mixed valence of iron. The structure exhibits a commensurate modulation, with a F-type subcell a ≈ b ≈ 5.4 Å (≈ ap√2), c ≈ 42 Å with a modulation vector q = αa* with α = 0.4. The supercell parameters have ...