Evangelos M. Tsampouris

Geometry Optimization of PMSMs Comparing Full and Fractional Pitch Winding Configurations for Aerospace Actuation Applications

Optimization of electromechanical aerospace actuators requires a multi-objective and comparative analysis in order to account for performance and manufacturing cost terms. This paper introduces a particular optimization methodology presenting stable convergence characteristics which has been applied to optimize the geometry of both Fractional Slot Concentrated Winding (FSCW) and Full Pitch Concentrated Winding (FPCW) permanent magnet motor configurations. The proposed algorithm combines technical and physical advantages of the FSCWs and FPCWs into an optimally shaped stator-winding configuration. The resultant motor design has been validated through a prototype and experimental results illustrated its suitability for aerospace actuation applications.

Dynamic Finite Element Hysteresis Model for Iron Loss Calculation in Non-Oriented Grain Iron Laminations Under PWM Excitation

This paper introduces a dynamic finite element model for calculating iron loss in ferromagnetic non-oriented grain laminations under pulse-width modulation (PWM) excitation. The proposed methodology accounts for static hysteresis, classical eddy currents and anomalous losses and has been validated by measurements in Epstein device in different cases of PWM voltage waveforms. The model is based on a particular 2-D finite-element technique by using standard static iron lamination characteristics and offers sufficient accuracy in all studied cases.

Particular Electromagnetic Field Computation for Permanent Magnet Generator Wind Turbine Analysis

Precise permanent magnet generator modeling requires a complex electromagnetic field analysis in order to account for rotor eccentricity and end-zone leakage field. The paper presents a particular technique that enables considering such phenomena through convenient 2-D and 3-D finite element models and incorporate electromotive force distributions including space harmonics in real time control systems. The proposed methodology has been validated by measurements on a permanent magnet wind generator prototype.

Evolutionary optimization of Permanent Magnet machine design for traction applications

Permanent Magnet (PM) machines constitute a favored drive choice in electric traction applications due to their increased efficiency. Design optimization of such machines could enhance their ability to satisfy contradictory static and dynamic requirements. In this paper a Differential Evolution (DE) algorithm for PM machine design optimization, coupled with a finite element analysis (FEA) is employed.

Dynamic finite element hysteresis model for iron loss calculation under PWM excitation

The paper introduces a dynamic finite element model for calculating iron loss in ferromagnetic laminations under PWM excitation. The proposed methodology accounts for static hysteresis, classical eddy currents and anomalous losses and has been applied to predict hysteresis loops in Epstein device in three different cases of PWM voltage waveform types: unipolar, bipolar and square wave. The model is tuned by using standard static iron lamination characteristics provided by constructors and offers sufficient accuracy in all the aforementioned cases.

Coupled Field and Circuit Model Analysis of Permanent Magnet Synchronous Machine for Direct Torque Control Optimization

The pulsating torque of a permanent magnet motor has detrimental effects on the motor operation, resulting in speed perturbation, positioning error, vibration, and noise. Several efforts of countering the torque ripple focus on magnet pole shape optimization procedures while other efforts apply sophisticated modifications of control algorithms. In this paper a coupled field and circuit model of a permanent magnet synchronous machine (PMSM) is introduced in order to reduce the effects of pulsating torque. The model comprises of a 2D finite element model for detailed computation of the machine field distribution coupled with an external equivalent circuit for macroscopic parameter evaluation. Model results are then integrated in a direct torque control algorithm for the minimization of torque ripple in a PM machine prototype.

High Temperature Permanent Magnet Machine Actuators for Aerospace Applications

The paper presents technologies for developing efficient high temperature permanent magnet machines implemented in aerospace drive applications. Selection criteria and experimental investigation of the permanent magnet material is undertaken and design considerations enabling to meet the specifications set are described. The proposed control algorithm for an appropriate PWM inverter is introduced.

Overview of the Alternative Topologies of Linear Generators in Wave Energy Conversion Systems

Several operation principles and generator types have been developed because of the growing interest for the wave energy conversion systems (WECSs). A WECS is demanded to be more efficient so that the overview of the already developed systems is necessary. An overview of the different operation principles and the various linear generator types is presented analyzing the advantages and the disadvantages. Finally, a complete scheme gathering the most vital characteristics is introduced.

Power Quality Considerations for Microgrids Integrating Pairs of Mechanically Coupled Electrical Machines Driven by Power Converters

Microgrids integrating distributed motor-generator units are commonplace in locomotive and industrial applications. The behavior of these systems is dependent upon various design-operating parameters. However there is a distinct relation between power quality and power flow within these units. This paper presents an analysis of power quality measurements, depicting this interdependence. Respective results can be taken under consideration during power flow programming, enabling enhanced system operation.