Search

This paper presents the multiphysics design optimization of a permanent magnet synchronous generator (PMSG). A medium-power wind turbine (55 kW) is taken as the basis for the design optimization, whereas reducing its cost is the optimization goal. The design comprises the multiphysics generator model and the cost and losses models of the grid connection static power converters (SPC). The power converter command strategy is analyzed as it influences the system cost. Papers that dealt with the optimal design of the PMSGs usually did not consider the SPC cost and losses in the total system cost. The analysis of three power converter command strategies, implemented in the multidisciplinary design optimization, aims to define the phase angle of the generator current that leads to the lowest cost of the system composed by the generator and power converter. [ABSTRACT FROM AUTHOR]

This paper deals with the formulation and programing of architecture of software component generated by Reluctool. This software tool allows the modeling of large reluctance networks of electrical machines. Portable model formulation and code architectures are introduced facing the model generation time, the model size, and the computation time. Different approaches are discussed to improve this aspect. Finally, the code architecture is compared with the actual code architecture of the commercial and previous version of Reluctool. [ABSTRACT FROM AUTHOR]

To improve interoperability between system-level modeling and simulation, this paper proposes an approach to export models from dedicated magnetic tools into a standardized format, such as Very-high-speed integrated circuits Hardware Description Language-Analog and Mixed Signal (VHDL-AMS), as a powerful modeling language. The goal is to let designers use a unique modeling approach and single simulation tool to simulate the behavior of a complete electromagnetic system and to make the translation of existing models to VHDL-AMS easy. Thus they can reduce the investment. This paper addresses this methodology as a computer-aided generation of the VHDL-AMS code from macro and micro electromagnetic devices for system simulation. The translation uses model-driven engineering methods for the transformation of one model to another and the code generation from models. Implementation and methodology are illustrated on a dynamic E-shaped actuator as a macro-system case study and a diamagnetic levitation device as micro-system one. [ABSTRACT FROM AUTHOR]

The aim of this paper is to discuss electrical machines building and computation while taking into account the change of reluctance network (RN) topology required in an optimization process. Indeed, as electrical machine RN changes during an electrical period, this model has to consider several rotor positions to analyze harmonic influence on machine performance (e.g., its torque and losses). Such a requirement can also be important in applications where machine geometry changes shortly during sizing process by optimization. These two cases are addressed in this paper. Using established independent meshes of the initial RN, this paper proposes an algorithm to deal with all topologies necessary for an optimization process. This aims to reduce the computation time, increase the model, and improve the solving stability. An output selectivity approach is also applied on the RN modeling to improve the computation time of the optimization process. The simulation results are compared to finite-element methods and the optimization performance is presented. [ABSTRACT FROM AUTHOR]

A new approach for easy and fast modeling of EMI filter in aircraft application is proposed, in order to be used in an optimization process. A modular description in a user friendly environment allows describing the model and taking into account all the technological parameters of the system, i.e., the control strategy, the inverter model (semiconductors, layout, etc.), the filter, the cables, and the ac machine. The frequency model is automatically built from this description, as well as its gradients according to its inputs. In a second step, by using this model, an optimization of the filter values can be carried out, using various algorithms, to reach the smallest volume. This early design methodology can also be used to investigate the impact of some technological choices of the electrical drive (control strategy or cable characteristics for instance) on the filter volume. [ABSTRACT FROM AUTHOR]

With the increasingly high level of electrical system integration, the modeling of both the system behavior and the detailed physics of its elements becomes necessary. VHDL-AMS language allows to describe a range of physical systems, such as electro-magnetic devices, using a unified design approach to simulate a complete system. In addition, the most important constraint in the hierarchical modeling of the design cycle is the difficulty to use the same language or tool for the whole modeling steps and define a single set of tests for each description level. VHDL-AMS can be used as unified language for multilevel modeling, but it cannot support the description of some physical phenomena such local ones. The aim of the paper is to achieve the behavioral and the detailed modeling of multiple energy domains using VHDL-AMS, and their integration in the system environment. It proposes solutions to extend the computation capability of this language, based on computer-aided coupling strategies. [ABSTRACT FROM PUBLISHER]

Automatic differentiation (AD) is introduced as a powerful technique to compute derivatives of functions given in the form of computer programs in high-level programming languages such as FORTRAN, C, or C++. This paper applies AD to compute error-free gradients of electromagnetic device sizing models. Then, the obtained gradients are exploited in optimization to size electromagnetic devices by means of minimizing a cost function with constrained parameters and performances. Often, the electromagnetic devices models have to be described not only by analytical formulas, but also by algorithms. This paper proposes an electromagnetic model of a linear actuator dealing with implicit equations solved by numerical algorithms. The ADOL-C package is considered for automatic differentiation. [ABSTRACT FROM PUBLISHER]

Simulation is ubiquitous in many scientific areas. Applied for dynamic systems usually by employing differential equations, it gives the time evolution of system states. In order to solve such problems, numerical integration algorithms are often required. Automatic differentiation (AD) is introduced as a powerful technique to compute derivatives of functions given in the form of computer programs in a high-level programming language such as FORTRAN, C, or C++. Such technique fits perfectly in combination with gradient-based optimization algorithms, provided that the derivatives are evaluated with no truncation or cancellation error. This paper intends to use AD employed for numerical integration schemes of dynamic systems simulating electromechanical actuators. Then, the resulting derivatives are used for sizing such devices by means of gradient-based constrained optimization. [ABSTRACT FROM AUTHOR]

This paper looks at the collaborative design activity involved in a design experiment of an electromechanical plunger. Much of the coordination was achieved through internet-based communication. As mechanical and electrical researchers involved in the design project, we discuss the information exchanges highlighted by our different professional cultures and relate how these exchanges lead us to propose some methodology to improve the efficiency of virtual meetings. Moreover, we show the need for new communication tools, ones dedicated to specific tasks that are not currently supported, especially shared concept formalization among technical experts. [ABSTRACT FROM AUTHOR]