Apparatus and method for starting a synchronous machine

H - Electricity – 02 – P

Patent

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H02P 6/20 (2006.01)

Patent

CA 2208182

A method and an apparatus for starting a synchronous machine having a rotor and a stator provided with windings. The rotor has an initial position relative to the stator. The method comprises the steps of (a) initialising a starting phase for starting a first vector sum of a series of current vector sums to be applied to the windings; (b) applying a series of current vector sums to the windings; (c) sensing rotor movement and the direction thereof for each of the current vector sums applied in step (b); (d) for each movement and direction sensed in step (c), compensating for the phase of a subsequent current vector sum applied to the windings in order to return the rotor to its initial position; (e) sensing whether the rotor has moved relative to the stator after the application of the series of current vector sums and either increasing the starting phase by a value other than a multiple of 180 electric degrees if the rotor has not moved and returning to step (b), or going to step (f); and (f), after step (e), storing the phase value of the last in the series of vector sums applied to the windings, whereby the machine is ready to be operated on the basis of the phase value stored in step (f).

La méthode et l'appareil sont pour démarrer une machine synchrone ayant un rotor et un stator munis d'enroulements. Le rotor a une position initiale par rapport au stator. La méthode comprend les étapes suivantes: (a) initialiser une phase de démarrage d'une première somme vectorielle de sommes vectorielles successives de courants destinée à être appliquée aux enroulements; (b) appliquer des sommes vectorielles successives de courants aux enroulements; (c) détecter, pour chacune des sommes vectorielles de courants appliquée à l'étape (b), un mouvement du rotor et une direction de ce mouvement; (d) compenser pour chaque mouvement et chaque direction détectés à l'étape (c), la phase d'une somme vectorielle subséquente de courants appliquée aux enroulements pour ramener le rotor vers sa position initiale; (e) détecter si le rotor a bougé par rapport au stator après l'application des sommes vectorielles successives de courants et, soit augmenter la phase de démarrage d'une valeur différente d'un multiple de 180 degrés électriques si le rotor n'a pas bougé et retourner à l'étape (b), ou aller à l'étape (f); et (f) après l'étape (e), mémoriser la valeur de phase de la dernière des sommes vectorielles successives appliquée aux enroulements, ainsi la machine est maintenant prête à être mise en opération à partir de la valeur de phase mémorisée à l'étape (f).

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