Stratégie de modulation des PMSM triphasés doubles
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Ce livre m�ne principalement des analyses et des recherches sur la vibration concentr�e excit�e par des harmoniques � haute fr�quence du DTP-PMSM existant dans la plage �troite du spectre. Tout d'abord, un mod�le math�matique du PMSM bi-triphas� est �tabli et l'algorithme SVPWM � quatre vecteurs maximum est introduit. Sur cette base, une technologie SVPWM al�atoire multiple est propos�e pour pallier les insuffisances de la m�thode SVPWM traditionnelle � retard variable. Ensuite, un algorithme SVPWM � double centralisation est propos�, qui �limine les harmoniques PWM aux fr�quences porteuses multiples impaires. Pour la forme d'onde PWM asym�trique, un SVPWM doublement centralis� bas� sur une porteuse triangulaire est propos�, ce qui r�duit la difficult� de mise en oeuvre. En outre, en combinaison avec la m�thode de retard variable, l'influence de la m�thode de fr�quence de porteuse variable sur la bande de basse fr�quence est r�duite. Enfin, des �tudes de simulation et des �tudes exp�rimentales sont r�alis�es sous l'angle de l'analyse des harmoniques � haute fr�quence, de l'essai d'acc�l�ration des vibrations, du facteur d'�talement du spectre et de l'analyse des performances � basse fr�quence afin de v�rifier l'efficacit� de la strat�gie de contr�le propos�e.
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