Method of ac converter-fed motor control and its application

H - Electricity – 02 – P

Patent

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H02P 6/18 (2006.01)

Patent

CA 2641994

The invention relates to electric engineering, in particular to methods for controlling an ac electronic motor . The inventive control method consists in starting and rotating a rotor upon EMF signals in current-free sections of an armature winding, in converting the EMF signals into discrete logical level signals by a normaliser, in detecting switching points by means of a microcontroller and in displacing said points according to a load current quantity, the rotor speed of rotation and the inductance of the armature winding sections, wherein the switching points are calculated and displaced with respect to bridging times of the free sections EMF whose voltage levels are different from zero. The inventive device is characterised in that it comprises a reference level displacing unit (26), which is arranged in the normaliser between a divider 22 and a comparator unit (23) and which consists of a current sensor (27), a voltage sensor (27), two adders (29, 30) and an inverter (31).

L'invention appartient au domaine du génie électrique et concerne notamment des procédés destinés à commander un moteur c.a. électronique. Le procédé de commande de l'invention consiste à démarrer et à faire tourner le rotor en fonction des signaux de FEM dans les sections libres de courant d'enroulement de l'induit, à convertir les signaux de FEM par un normalisateur dans des signaux discrets de niveau logique, à déterminer par un micro-contrôleur des points de commutation et à les décaler en fonction des valeurs du courant de charge, de la vitesse de rotation du rotor et de l'inductivité des sections d'enroulement de l'induit, les points de commutation étant calculés et décalés par rapport aux points de transition de FEM des sections libres différentes de zéro. La particularité de l'invention consiste en la présence d'une unité de décalage du niveau de référence (26) montée dans le normalisateur entre le diviseur (22) et l'unité de comparateur (23) et constituée d'un capteur de courant (27), d'un capteur de tension (28), de deux additionneurs (29, 30) et d'un inverseur (31).

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