Optimal Matching Between a Permanent Magnet Synchronous Machine and a Wind Turbine – Statistical Approach

International audiencehis paper proposes a methodology to decide the optimal matching between the size of the rotor of a wind turbine and the rated power of a permanent magnet synchronous machine. This is made taking into account the average electrical energy produced over a period of time. The analytical model of the wind energy conversion system is used to calculate the output power curve. The influence of the number of pairs of poles over the average power is also studied

SISTEMAS DE CONVERSIÓN DE ENERGÍA EÓLICA CONTROL Y DISEÑO

International audienceEste artículo aborda algunas de las soluciones actuales más utilizadas de los sistemas de generación eólica, enfatizando en los fundamentos del control y el diseño de aplicaciones individuales de potencia reducida. Lo previo, orientado a pequeños sistemas de potencia rurales o aislados, donde la conexión a la red pública es difícil o muy costosa. Se examinan los elementos en común y diferencias de las diversas propuestas existentes, ventajas y desventajas, su potencial y lo que se puede esperar de sus tendencias en el mediano y largo plazo

Analytical Calculation of Rotor Magnet Eddy-Current Losses for High Speed IPMSM

International audienceFor high-speed machines applications, eddy-current losses in the interior permanent magnet of synchronous machine (IPMSM) form a portion of the total losses which can be significant. Indeed, the magnets are exposed to the harmonic fields which rotate with respect to the rotor. The induced losses in the magnets provoke temperature arising that must be limited to avoid the risk of demagnetization. The study carries out a prediction of eddy current losses in PM where the skin effect is considered. A complete analytical model is presented and compared to 3D Finite Element (FE) harmonic computations. The results given by the proposed model are in agreement with the FEA results for local electromagnetic quantities and loss calculations. This approach can be useful for losses estimation in magnets when designing machines by analytical method

Design and sizing of electromagnetic linear actuators for valve applications

International audienceIn this paper, various structures of linear motion actuators are described. These structures have been studied in order to drive the valves of a car motor. According to general specifications, a description of the design and sizing of variable reluctance or permanent magnet devices is given. The main qualities of each structure are enhanced

Magnetic Losses Evaluation in PM SM Drive with Non Sinusoidal Supply by Finite Elements Analysis and Superposition

International audienceField superposition in rotating machines with sinusoidal distribution of magneto motive force and non sinusoidal voltage supply is analyzed in view of specific behavior of field components rotating in opposite direction at the same velocity in relation to rotor. These components – 5th and 7th, or 11th and 13th etc – form oscillating fields which imply rotor losses quite different than it is usually expected in superposition procedures, where overall losses are given by sum of effects produced by individual harmonic components of sliding fields. In case of eddy current losses in rotor's permanent magnets the difference for one pair of harmonics can reach several tens per cent

Magnetic Lossess Simulation in PM SM Drive by FE: Harmonic Superposition by Method of Locked Rotor

International audienceThe PWM-supplied permanent magnet synchronous machines are exposed to magnets' heating due to harmonic fields which rotate in relation to rotor. The corresponding losses can be calculated by FE simulation for each frequency, with superposition of all components of the losses. In certain conditions three dimensional modelling is required to get enough precision. However, time-stepping 3D finite element methods coupled with motion equations can lead to excessive computational time. Then a locked rotor approach with current sheet rotating may be interesting. In this case however, the superposition doesn't really work unless special procedure is applied. Magnetic loss dissipation cannot be correctly calculated with simple superposition of individual fields, e.g. the 5th and 7th harmonic rotating in opposite direction. This is because the resulting field has an alternative component with dissipative effects depending on its position. They will be more important if the component oscillates in the middle of magnets and less important in the middle of gap between them

Single Line-to-Ground Fault Detection in Face of Cable Proliferation in Compensated Systems

ISBN: 978-953-307-037-7livre "Fault Detection" edited by Wei Zhang, In Tech 201

Influence of Power Converter Losses Evaluation in the Sizing of a Hybrid Renewable Energy System

International audienceAn improvement to the precision of losses calculation in static converters used in a hybrid renewable energy system (HRES) is presented in this article. The objective is to be able to evaluate energy losses in the system during the unit sizing process. The models developed in this paper consider the conduction and switching losses to take into account the variation of the converters efficiency together with the load variations. The proposed approach for the energy losses calculation is tested with an already sized HRES. The methodology is compared on an hour-byhour basis with a constant efficiency rate approach using a specially developed simulation program. The importance of the correct energy losses evaluation is demonstrated

OPTIMISATION OF A DRIVE SYSTEM AND ITS EPICYCLIC GEAR SET

International audienceThis paper describes the design of a drive consisting of a DC motor, a speed reducer, a lead screw transformation system, a power converter and its associated DC source. The objective is to reduce the mass of the system. Indeed, the volume and weight optimisation of an electrical drive is an important issue for embedded applications. Here, we present an analytical model of the system in a specific application and afterwards an optimisation of the motor and speed reducer main dimensions and the battery voltage in order to reduce the weight

Multi objective optimisation of an electromagnetic valve actuator

International audienceThis paper is about a modelling and an optimisation of an electromechanical drive system. The device consists of a DC source, a power converter, a linear actuator and its load. The aim of the system is to drive a load along a linear displacement. The two main objectives are to reduce the actuator volume and the copper losses, which are contrary objectives. Here, we present an analytical modelling of the system and afterwards an optimisation of the linear actuator main dimensions in order to carry out the previous objectives