H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 27/02 (2006.01) G01P 3/48 (2006.01)
Patent
CA 2344687
The invention relates to a method for measuring the speed (n) of an induction machine (2) whose stator is connected to a single- or multiple-phase AC voltage network (L1, L2, L3) by a controllable AC power controller (4). According to this method, the stator is disconnected from the AC voltage network (L1, L2, L3) for at least a predetermined time period (.DELTA.t) by opening the valves (6) of the AC power controller (4). During this time period (.DELTA.t), at least one stator voltage (uSX, uSY) induced in the stator by the rotary motion of the rotor is measured. The measured values are used to determine the frequency of said stator voltage (uSX, uSY) and the speed (n) of the induction machine (2) is then derived from the frequency.
L'invention concerne un procédé permettant de mesurer la vitesse (n) d'une machine inductive (2) dont le stator est relié à un réseau de tension alternative (L1, L2, L3) mono- ou multiphase, par l'intermédiaire d'un gradateur de courant alternatif (4). Il est prévu selon l'invention de couper le stator du réseau de tension alternative (L1, L2, L3), au moins pendant une période prédéterminée (.DELTA.t), par ouverture des clapets (6) du gradateur de courant alternatif (4). Au cours de cette période (.DELTA.t), au moins une tension statorique (u¿SX?, u¿SY?) induite dans le stator par le mouvement de rotation du rotor est mesurée. La fréquence de cette tension statorique (u¿SX?, u¿SY?) est déterminée à partir des valeurs mesurées ainsi obtenues et la vitesse (n) de la machine inductive (2) est ensuite dérivée de la fréquence obtenue.
Griepentrog Gerd
Runggaldier Diethard
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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