H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 27/02 (2006.01) G01R 31/34 (2006.01)
Patent
CA 2068155
An electric induction motor is coupled to a source of alternating current by a thyristor switch. A control circuit triggers the thyristor switch to create conductive and non-conductive states during each cycle of the alternating current. A circuit senses the voltage across the thyristor switch during a non-conductive state. From that sensed voltage and known characteristics of the motor being controlled, the control circuit derives a measurement of the current flowing through the motor in the conductive state of the thyristor switch. One of two different derivation techniques is used depending upon the length of the non-conductive state. The control circuit includes a means for calibrating the derivation of the current measurement for a specific motor.
Un moteur électrique à induction est raccordé à une source de courant alternatif au moyen d'un thyristor. Un circuit de commande déclenche le thyristor pour créer des états de conduction et de non-conduction pendant chaque cycle de courant alternatif. Un circuit détecte la tension présente aux bornes du thyristor pendant un état de non-conduction. En fonction de cette tension détectée et des caractéristiques connues du moteur commandé, le circuit de commande dérive une mesure du courant qui circule dans le moteur, à l'état de conduction du thyristor. L'une des deux techniques de dérivation est utilisée, selon la durée de l'état de non-conduction. Le circuit de commande comprend un moyen pour étalonner la dérivation de la mesure de courant pour un moteur spécifique.
Chen Li
Unsworth Peter J.
Allen-Bradley Company Inc.
Shapiro Cohen
LandOfFree
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