Real time implementation of indirect rotor flux oriented control of a five-phase induction motor with novel rotor resistance adaption using sliding mode observer     

Hamdi Echeikh  Ramzi Trabelsi  Atif Iqbal  Med Faouzi Mimouni 《Journal of The Franklin Institute》2018,355(5):2112-2141

High performance multiphase motor drive requires precise knowledge of the state quantities and the machine parameters. Access to these state quantities is through measurement using sensors whose accuracy is paramount to achieve the performance level required by industrial applications. However, the problems of the parameters variations, inaccessibility to the measurement of some states, no-observability of the machine in some regions, the cost of the sensors and their lack of precision, make this very difficult task. To address these problems, it is necessary to resort to soft sensors through the design of observers and estimators. In multiphase induction motor drive, the observation problem arises especially for rotor flux that is not accessible for measurement. About the parameters variations, the rotor resistance and the stator resistance are the most critical parameters of the machine because their influence is crucial for the control and observation. The change in the resistances can be as large as 40–50% of the rated value, which may affect the control adversely. This paper develops a new structure of an adaptive sliding mode observer based on an online estimation of the rotor resistance value in order to avoid the effect of its variation in the rotor flux oriented control. The results show convergent (the errors in the transient and steady states are 5% and 1%, respectively) behavior of the drive using the proposed control scheme for large rotor resistance variation under loaded condition. The stability of the drive is proved using Lyapunov criteria. The simulation results are validated using real time implementation.  相似文献   

Sensitising Children to Ecological Issues through Textile Eco‐Design     

Amine Hadj Taieb  Manel Hammami  Slah Msahli  Faouzi Sakli 《The International Journal of Art & Design Education》2010,29(3):313-320

Human health is affected by pollution caused by toxic chemical substances, particularly vulnerable groups like children. So how can we make things better for people and for the environment through the textile products we design? By thinking about the environment when designing, choosing and using environmental‐friendly technology, we can play an important role in building a better world for the future. If we are going to live in a sustainable way, the technology and materials that we use have to be sustainable. This article provides an insight into how textile product design can provide a better future. It describes the design of ecological textile messages for sensitising and educating children. In the long term, such design may help towards ensuring a better quality of life for everyone, now and in the future. In this survey, the design of the sensitising messages was done using ecological techniques and raw materials to accentuate the message and took into account the intellectual and psychological level of children. All of the raw materials, process and plant dyes used were analysed from an environmental perspective.  相似文献