Papers by Nicolas Bracikowski
Proceedings of the 2011 14th European Conference on Power Electronics and Applications, 2011
This paper presents a new course on lighting systems in a French non-specialized engineer school.... more This paper presents a new course on lighting systems in a French non-specialized engineer school. This course was conceived to increase student attractiveness for power electronics. After two years of unfolding, the conclusions are interesting. A survey has shown that students were not really more interested in power electronics. The only students' plebiscite is the lighting design using DIALux software. The module is described and placed into the context of a non-specialized engineer school. Students' opinion is then analyzed and capitalized to find why power electronics does not look as an interesting subject for these specific engineers.
Linear motors are featured with direct linear motion, but it has a low torque density due to the ... more Linear motors are featured with direct linear motion, but it has a low torque density due to the presence of edge effects. The torque density of five-phase linear induction motor can be improved by injecting high order harmonics of the magnetic field. The purpose of the paper is to present the optimal control strategy of a five-phase linear induction motor based on a rotor-flux-oriented control scheme, which promoted the performance of linear induction motor. The proposed control scheme is confirmed using finite element modeling and experimental tests. And the temperature distribution of the LIM shows temperature rise of the motor under this strategy is within the specified range.
The magnetic gearboxes have received much attention in the last few years. Their numerous advanta... more The magnetic gearboxes have received much attention in the last few years. Their numerous advantages, such as low vibration, reduced acoustic noise, and minimum maintenance, are attracting considerable interest for sectors of a high growth like wind turbines and electric vehicles. The present paper aims to study the effect of the magnet and pole pieces opening on the torque of coaxial magnetic gears (CMGs) in order to optimize the latter. It is also about providing a fast and accurate model based on reluctance network method capable of describing the correct electromagnetic behavior of CMG. The confrontation of the obtained results to those calculated by finite element shows a good agreement while guaranteeing a considerable gain in computation time. The proposed model was adopted to optimize the CMG design using parameter-scanning method.
Machines, 2021
The low speed toothed doubly salient permanent-magnet (TDSPM) machine is an interesting candidate... more The low speed toothed doubly salient permanent-magnet (TDSPM) machine is an interesting candidate motor for electric ship applications because, of its high torque output, maintenance-free operation and flexible working modes, which gives the opportunity to increase system’s reliability, and decrease the system size, weight and noise which are key features for naval applications. However, particularly in the 3-phase configuration, the stator and rotor saliency of these machines leads to a high level of torque ripple. To overcome these drawbacks, the use of polyphase machines (with a number of phases greater than three) can be a relevant solution. In this paper, an optimal design of two kind of novel 4-phase motors is performed in order to fulfil the specifications of a high power naval ship propulsion. The designs aim to maximize the torque to mass ratio. The motors’ performances are directly linked to their structural parameters, so, the impact of the coil number in terms of mean to...
In this paper, a semi-analytical modeling method is applied to a Doubly Salient Permanent Magnets... more In this paper, a semi-analytical modeling method is applied to a Doubly Salient Permanent Magnets machine. This machine is characterized by a rotor carrying a large number of teeth. It is suitable to applications requiring high torque and low speed. A Reluctance Network is used in order to model the machine with a good compromise between accuracy and simulation duration. Moreover, the antisymmetric boundary conditions allow reducing significantly the time of model evaluation. After presenting the Reluctance Network, a comparison is made with a Finite Element Modeling. Finally, a geometric maximization of the torque mass ratio of the machine is performed.
This paper deal with the modeling of large power and distribution transformers by means of reluct... more This paper deal with the modeling of large power and distribution transformers by means of reluctance network method. It’s about a meshed approach that has the flexibility to fit different transformers topologies. The non-linear behavior and the coupling with the electrical circuit have been considered. The proposed model has the smartness to estimate accurately the appropriate distributions of the MagnetoMotive Forces (MMF) and the ElectroMotive Forces (EMF) even in the case of eventual defects. The model is generated by MatLab and built automatically under EMTP-RV, which is used as a solver. The obtained results are validated with finite element calculations and with measurements.
IEEE Access
In this paper, a strong coupling between magnetic and electric phenomena is provided allowing to ... more In this paper, a strong coupling between magnetic and electric phenomena is provided allowing to have an accurate and high-speed coupled model. A coupled circuit and magnetic model for an E-core transverse flux permanent magnet linear motor (TFPMLM) is proposed, which has an advantage linked to reducing time computing more than ten times when compared to 3-D finite-element model (FEM). Firstly, a multi-plane flexible-mesh nonlinear equivalent magnetic network (EMN) model is proposed to improve the computation efficiency as well as the high precision of the magnetic model. And a new method to define the converged iterative process is presented to further decrease the computing time. Secondly, the magnetic circuit and electric circuit are normalized into a solution matrix by introducing controlled sources and discretization methods which forms the coupled model. Then, the magnetic flux in the magnetic circuits and the current in the electric circuits are obtained simultaneously for each time step. The characteristics such as the air-gap flux density distribution, output thrust force waveforms and the phase currents are analyzed by the proposed coupled model. The modeling approach is approved by comparison with the 3-D FEM model. Finally, the proposed model is validated through the experimental setup with the machine prototype. INDEX TERMS Coupled model, electric circuit, equivalent magnetic network (EMN), linear motor, transverse flux.
IEEE Transactions on Industrial Electronics
In this paper, the design optimization of a nonsalient high-speed permanent magnet synchronous ma... more In this paper, the design optimization of a nonsalient high-speed permanent magnet synchronous machine (PMSM) for electric vehicle applications is presented. It will be shown how, with a new approach, it is possible to find a deterministic solution to solve the sizing of the machine from a given driving cycle. The optimal geometry and the optimal control strategy over the cycle minimizing both the energy losses and the volume of the machine will be calculated. At first, the one-dimensional analytical model used is presented and validated for the most significant point of the driving cycle using a finite element method. Then, the design methodology and the results through a specific application are detailed. Particularly, it will be shown how the flux weakening, directly given by the design process via the optimization of the control strategy, allows reducing both the energy losses and the constraints on the power converter. At last, in order to validate the solution considering the whole cycle while keeping a reduced computation time, a reluctance network model of the PMSM is used. This model validate the energy losses and the flux densities in the steel parts over the cycle. The study will be done considering the urban dynamometer driving schedule.
Modeling the dynamic behavior of electrical machines involves several fields of physics, such as ... more Modeling the dynamic behavior of electrical machines involves several fields of physics, such as electromagnetics, electronics, mechanics, thermodynamics and acoustics. Multi-physics lumped models are applied to an inverter-fed permanent magnet synchronous machine. These models are coupled and fully parameterized to optimize the machine for traction applications. A particle swarm optimization algorithm is used to obtain general tendencies and different design rules. The objective is to provide a decision-making tool using lumped models to design permanent magnet synchronous motors. In this paper, we focus on electromagnetic noise, and average and ripple electromagnetic torque. The magnetic model, a permeance network, provides a good compromise between accuracy and computing time.
IEEE Transactions on Magnetics
IET Electric Power Applications
This paper presents a new course on lighting systems in a French non-specialized engineer school.... more This paper presents a new course on lighting systems in a French non-specialized engineer school. This course was conceived to increase student attractiveness for power electronics. After two years of unfolding, the conclusions are interesting. A survey has shown that students were not really more interested in power electronics. The only students' plebiscite is the lighting design using DIALux software.
2014 17th International Conference on Electrical Machines and Systems (ICEMS), 2014
IEEE Transactions on Industrial Electronics, 2000
ABSTRACT This paper describes the modeling of a permanent magnet synchronous machine (PMSM) by us... more ABSTRACT This paper describes the modeling of a permanent magnet synchronous machine (PMSM) by using lumped models (LMs). Designing electrical machines necessarily involves several fields of physics, such as electromagnetics, thermics, mechanics, and acoustics. Magnetic, electrical, electronic, and thermal parts are represented by LMs, whereas vibro-acoustic and mechanical parts are represented by analytical models. The aim of this study is to build a design model of a PMSM for traction applications. Each model is parameterized to optimize the machine. The method of taking into account saturation and movement is described. These fast, LMs make it possible to couple the software used with optimization tools. Simulation results are presented and compared with the finite-element method and the experiments performed.
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Papers by Nicolas Bracikowski