Levantamento de curvas características de um motor de indução com enrolamento Dahander

Este trabalho possui como objetivo levantar experimentalmente as curvas características de Torque x Velocidade e Corrente de Partida x Tempo de um motor do tipo Dahlander. Este motor de indução trifásico possui a qualidade que permite a comutação de polos de seu enrolamento numa razão de 1:2, modificando a suas ligações. Deste modo, permite um controle discreto de velocidade. Apresentam-se conceitos construtivos e de funcionamentos de motores de indução para posteriormente identificar quais propriedades permitem a operação do motor nas duas ligações, bem como a identificação dos diferentes tipos de motores Dahlander na indústria.Para a realização deste projeto foi necessária a concepção de uma bancada com os medidores de torque, velocidade e corrente, além de equipamentos que enviem as medidas a um computador onde os dados são tratados resultando nas curvas características. O computador está munido do software Lab View que se comunica com diferentes equipamentos de medidas e possui uma interface gráfica que permite a apresentaçãodas curvas características diretamente.Os resultados obtidos comprovam o que a teoriaexpõe.As curvas Torque x Velocidade levantadas correspondem às de um motor Dahlander de torque constante. As curvas de Corrente de Partida x Tempo confirmamas vantagens deste motor em aplicações industriais.Validaram-se os resultados a partir do levantamento analíticodas curvas de Torque x Velocidade a partir domodelo do motorde indução. Osparâmetrosdo motor foram calculados através dos ensaios de corrente contínua, a vazio e de rotor bloqueado

Fault Tolerant Dual-Motor Drives: Sizing of Power Electronic

This paper analyzes two dual-motor fault-tolerant topologies. The first one supplies independently both machines while the second one connects them in series for reducing the number of transistors. For a given DC-link voltage, the converter component sizing is based on the peak current obtained in the normal and degraded modes.CIFFRE - Thales Grou

A Comparative Study of Two Fault-Tolerant Dual-Motor Drive Topologies Under Short-Circuit Inverter Switch Fault

This paper analyzes two dual-motor fault-tolerant topologies for aerospace thruster application. The first structure supplies independently both machines while the second one connects them in series for reducing the number of transistors and offering a capability of energy management between the sources. Inverter short-circuit fault is considered. Based on the peak-currents obtained in simulation in degraded mode without reconfiguration and with two different reconfiguration strategies, the two proposed topologies can be compared in economic and technical aspects

Demagnetization analysis of an open-end windings 5-phase PMSM under transistor short-circuit fault

For an open-end windings integrated Permanent Magnet Synchronous Machine, the demagnetization of the permanent magnets is analyzed when a transistor is short-circuited and no specific control strategy is adopted. Depending on the temperature, the high currents due to the inverter fault may locally demagnetized the permanent magnets leading to an accelerated aging of the machine and torque loss. A co-simulation, using a Finite Element software for the machine coupled with an average modeling of the transistor, gives interesting local prediction of the machine behavior in healthy and degraded mode.This work has been achieved within the framework of CE2I project. CE2I is co-financed by European Union with the financial support of European Regional Development Fund (ERDF), French State and the French Region of Hauts-de-France

Homopolar Current’s Copper Losses Analysis for Different Modulations in Open-End Winding Five-Phase drives

This work has been achieved within the framework of CE2I project. CE2I is co-financed by European Union with the financial support of European Regional Development Fund (ERDF), French State and the French Region of Hauts-de-France.This paper analyses the copper losses due to the homopolar current of a five-phase open-end winding machine supplied by a 10-leg inverter and a single DC voltage source. This topology can have non-null high frequency homopolar current components that can increase the machine’s copper losses and result in overheating of the motor phase windings. Accordingly, different modulation strategies are compared with the goal of reducing the homopolar current and, consequently the resulting copper losses. The comparison study is achieved using Matlab/Simulink and a finite element model in order to evaluate these losses.European Regional Development Fund (ERDF

A Comparative Study of Two Fault-Tolerant DualMotor Drive Topologies Under Short-Circuit Inverter Switch Fault

This paper analyzes two dual-motor fault-tolerant topologies for aerospace thruster application. The first structure supplies independently both machines while the second one connects them in series for reducing the number of transistors and offering a capability of energy management between the sources. Inverter short-circuit fault is considered. Based on the peak-currents obtained in simulation in degraded mode without reconfiguration and with two different reconfiguration strategies, the two proposed topologies can be compared in economic and technical aspects.CIFRE - Groupe Thale

Generalized Vectorial Formalism – based multiphase series-connected motors control

Multiphase drives are more and more used in specific applications leading to a necessity of control strategy development. This paper presents the Generalized Vectorial Formalism (GVF) theory to control multiphase series-connected permanent magnet synchronous motors (PMSM) fed by one voltage source inverter (VSI). Based on a decomposition of multiphase machine, a proposed control strategy has been achieved. Some experimental results are given to illustrate this control metho

A Comparative Study of Two Fault-Tolerant Dual-Motor Drive Topologies Under Short-Circuit Inverter Switch Fault

This paper analyzes two dual-motor fault-tolerant topologies for aerospace thruster application. The first structure supplies independently both machines while the second one connects them in series for reducing the number of transistors and offering a capability of energy management between the sources. Inverter short-circuit fault is considered. Based on the peak-currents obtained in simulation in degraded mode without reconfiguration and with two different reconfiguration strategies, the two proposed topologies can be compared in economic and technical aspects

Torque optimization of seven phase BLDC machines in normal and degraded modes with constraints on current and voltage

This paper proposes several easy-to-implement control strategies when seven-phase axial flux brushless DC machines with trapezoidal back electromotive forces operate in normal and faulty modes by taking into account constraints on voltage and current. The constraints are related to the converter and machine design in terms of maximum values of current and voltage. The considered faults are cases in which one or two phases of the machine are open-circuited. Numerical computations based on analytical formulations are applied to obtain torque-speed characteristics, including the fluxweakening operation. The methods determine current references to ensure the torque optimizations while currents and voltages are within their limits. The usefulness of the methods is verified by numerical results

Dual-Multiphase Motor Drives for Fault- Tolerant Applications: Power Electronic Structures and Control Strategies

This paper analyzes two fault-tolerant dualmultiphase motor drives, a series connected topology and a standard H-bridge topology. Previous studies have shown that the series connected topology is appropriate to an aerospace application and has lower peak current in degraded mode in comparison with the H-bridge topology, which may consequently diminish the system’s weight and cost. This paper extends the study to compare different control strategies of these structures under two fault conditions: short-circuit of an inverter’s switch and an open-phase of the machine. The control strategies analyzed in this paper do not impact the fundamental current or the torque generation, but the amplitudes of some harmonics in degraded mode are expected to be narrowed down in order to reduce the inverter’s size. Some analyses of maximum voltage and peak current in degraded mode have been used for inverter dimensioning. Experimental results are shown and compared to the simulated ones to confirm the validity of this study.Thales Avionics Electrical System