Daniel Ilina - Academia.edu (original) (raw)
Papers by Daniel Ilina
Renewable Energy and Power Quality Journal, 2007
The paper studies the magnetizing magnetic field, the radial and axial forces of a linear electri... more The paper studies the magnetizing magnetic field, the radial and axial forces of a linear electric generator used to convert the marine wave's energy. The study takes into account different sizes for the permanent magnets and the relative position of the moving armature over the stator and shows when the magnetizing flux is maxim. For different positions of the moving armature the radial and axial forces are computed. The magnetic field and the forces are computed on finite element method basis using FEMM.
Renewable Energy and Power Quality Journal, 2008
The paper shows a 2D finite element optimization method for a wind turbine permanent magnet synch... more The paper shows a 2D finite element optimization method for a wind turbine permanent magnet synchronous generator (PMSG) transverse geometry. Keeping the same rotor diameter the generator's magnetic flux is maximized by changing the permanent magnets and rotoric slot opening dimensions. The studies show that for certain values of these dimensions the magnetic flux (flux linkage and mutual flux) has maximum values.
Renewable Energy and Power Quality Journal, 2009
Paper presents a lab low power wind turbine of 2.5 kW. The driving propeller is modeled with an a... more Paper presents a lab low power wind turbine of 2.5 kW. The driving propeller is modeled with an assembly of variable frequency converter, three-phase induction motor and speed reducer. Thus the motor's speed can be easily driven in the range of (300-1500) rpm and its size is little. The speed reducer lowers the speed 5 times so that the generator will spin in the range (60-300) rpm. This range is usual for the propellers of wind turbines. In the end the trials of the system are presented using a specific data acquisition system.
MELECON 2008 - The 14th IEEE Mediterranean Electrotechnical Conference, 2008
... 1 Politehnica University of Bucharest, Electrical Engineering Faculty, Sp. Indendenţei, 313, ... more ... 1 Politehnica University of Bucharest, Electrical Engineering Faculty, Sp. Indendenţei, 313, Bucharest, ROMANIA, email: ghitac@iem.pub.ro; aurel.chirila@gmail.com; dragos.deaconu@ gmail.com; valentin.navrapescu@gmail.com; ilinadaniel@yahoo.com. than 10 c/kWh. ...
2014 International Conference and Exposition on Electrical and Power Engineering (EPE), 2014
We provide easily verifiable sufficient conditions for the existence of solutions to nonlinear or... more We provide easily verifiable sufficient conditions for the existence of solutions to nonlinear ordinary differential equations subject to nonlocal boundary conditions. These conditions are based on the solution space of the corresponding linear, homogeneous problem and on the size of the nonlinear perturbation. The results presented here are more general nonlinearities than those in [17] and [26].
The paper presents an analytical method to compute the leakage magnetic field inside a transforme... more The paper presents an analytical method to compute the leakage magnetic field inside a transformer’s window generated by the magnetizing magneto motive force supposing the magnetic permeability of the core to be infinite. The same magnetic field is computed using a 2D finite element method taking into account the non-linear magnetizing characteristic of the transformer’s core. A comparison between the results of the two methods is also presented.
2011 7TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE), 2011
The paper presents an experimental procedure for determining the moment of inertia and mechanical... more The paper presents an experimental procedure for determining the moment of inertia and mechanical losses versus speed characteristic, in electrical machines. The experiment uses the retardation test and a Matlab/Simulink algorithm for computing the deceleration curve.
The paper presents an analytical method to compute the leakage magnetic field inside a transforme... more The paper presents an analytical method to compute the leakage magnetic field inside a transformer's window generated by the magnetizing magneto motive force supposing the magnetic permeability of the core to be infinite. The same magnetic field is computed using a 2D finite element method taking into account the non-linear magnetizing characteristic of the transformer's core. A comparison between the results of the two methods is also presented.
2013 8TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE), 2013
ABSTRACT
Renewable Energy and Power Quality Journal, 2007
The paper studies the magnetizing magnetic field, the radial and axial forces of a linear electri... more The paper studies the magnetizing magnetic field, the radial and axial forces of a linear electric generator used to convert the marine wave's energy. The study takes into account different sizes for the permanent magnets and the relative position of the moving armature over the stator and shows when the magnetizing flux is maxim. For different positions of the moving armature the radial and axial forces are computed. The magnetic field and the forces are computed on finite element method basis using FEMM.
Renewable Energy and Power Quality Journal, 2008
The paper shows a 2D finite element optimization method for a wind turbine permanent magnet synch... more The paper shows a 2D finite element optimization method for a wind turbine permanent magnet synchronous generator (PMSG) transverse geometry. Keeping the same rotor diameter the generator's magnetic flux is maximized by changing the permanent magnets and rotoric slot opening dimensions. The studies show that for certain values of these dimensions the magnetic flux (flux linkage and mutual flux) has maximum values.
Renewable Energy and Power Quality Journal, 2009
Paper presents a lab low power wind turbine of 2.5 kW. The driving propeller is modeled with an a... more Paper presents a lab low power wind turbine of 2.5 kW. The driving propeller is modeled with an assembly of variable frequency converter, three-phase induction motor and speed reducer. Thus the motor's speed can be easily driven in the range of (300-1500) rpm and its size is little. The speed reducer lowers the speed 5 times so that the generator will spin in the range (60-300) rpm. This range is usual for the propellers of wind turbines. In the end the trials of the system are presented using a specific data acquisition system.
MELECON 2008 - The 14th IEEE Mediterranean Electrotechnical Conference, 2008
... 1 Politehnica University of Bucharest, Electrical Engineering Faculty, Sp. Indendenţei, 313, ... more ... 1 Politehnica University of Bucharest, Electrical Engineering Faculty, Sp. Indendenţei, 313, Bucharest, ROMANIA, email: ghitac@iem.pub.ro; aurel.chirila@gmail.com; dragos.deaconu@ gmail.com; valentin.navrapescu@gmail.com; ilinadaniel@yahoo.com. than 10 c/kWh. ...
2014 International Conference and Exposition on Electrical and Power Engineering (EPE), 2014
We provide easily verifiable sufficient conditions for the existence of solutions to nonlinear or... more We provide easily verifiable sufficient conditions for the existence of solutions to nonlinear ordinary differential equations subject to nonlocal boundary conditions. These conditions are based on the solution space of the corresponding linear, homogeneous problem and on the size of the nonlinear perturbation. The results presented here are more general nonlinearities than those in [17] and [26].
The paper presents an analytical method to compute the leakage magnetic field inside a transforme... more The paper presents an analytical method to compute the leakage magnetic field inside a transformer’s window generated by the magnetizing magneto motive force supposing the magnetic permeability of the core to be infinite. The same magnetic field is computed using a 2D finite element method taking into account the non-linear magnetizing characteristic of the transformer’s core. A comparison between the results of the two methods is also presented.
2011 7TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE), 2011
The paper presents an experimental procedure for determining the moment of inertia and mechanical... more The paper presents an experimental procedure for determining the moment of inertia and mechanical losses versus speed characteristic, in electrical machines. The experiment uses the retardation test and a Matlab/Simulink algorithm for computing the deceleration curve.
The paper presents an analytical method to compute the leakage magnetic field inside a transforme... more The paper presents an analytical method to compute the leakage magnetic field inside a transformer's window generated by the magnetizing magneto motive force supposing the magnetic permeability of the core to be infinite. The same magnetic field is computed using a 2D finite element method taking into account the non-linear magnetizing characteristic of the transformer's core. A comparison between the results of the two methods is also presented.
2013 8TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE), 2013
ABSTRACT