Rotor position sensing in a dynamoelectric machine using...

H - Electricity – 02 – K

Patent

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H02K 29/06 (2006.01) H02P 6/18 (2006.01) H02P 25/08 (2006.01)

Patent

CA 2188888

A polyphase dynamoelectric machine (10) such as a switched reluctance motor has a stator assembly (12) and a rotor assembly (14). The rotor assembly is movable with respect to the stator assembly. The stator assembly includes a stator (16) having a plurality of stator poles (18). The rotor assembly includes a rotor (20) having a plurality of rotor poles (22). The stator assembly further includes a plurality of separately energizable stator windings (24) associated with the respective machine phases. These stator windings are energized and de-energized in a predetermined sequential manner to sequentially activate and deactivate themachine phases. Energization and de-energization of the respective stator windings is at least partially determined as a function of the machine's instantaneous rotor position. The machine includes a processor (26) for determining the rotor position. The processor monitors the waveform of a circulating current coupled from an energized stator winding for an active machine phase into a de-energized stator winding for an inactive machine phase. Respective energized and de-energized stator windings are interconnected to forma closed circuit path by which the current in the energized stator winding is coupled into the de-energized stator winding. Monitoring the resultant current waveform provides an indication of rotor position, and the processor uses this information to energize and de-energize the stator windings.

La présente invention a pour objet un machine dynamoélectrique polyphasée (10), tel un moteur SRM, comportant un ensemble de stator (12) et un ensemble de rotor (14). L'ensemble de rotor se déplace par rapport à l'ensemble de stator. L'ensemble de stator comporte un stator (16) possédant une pluralité de pôles statoriques (18). L'ensemble de rotor comporte un rotor présentant une pluralité de pôles rotoriques (22). L'ensemble de stator comporte en outre une pluralité d'enroulements d'induit (24) à excitation séparée en association avec les phases respectives de la machine. Ces enroulements d'induit sont excités et désexcités en séquence pour activer et désactiver séquentiellement les phases de la machine. L'excitation et la désexcitation des enroulements respectifs de la machine est déterminée au moins partiellement en fonction de la position du rotor de la machine en un instant déterminé. La machine comporte un processeur (26) servant à déterminer la position du rotor. Le processeur en question surveille la forme d'onde d'un courant de circulation entre un enroulement statorique excité en phase active et un enroulement statorique désexcité en phase inactive. Les enroulements statoriques respectivement excités et désexcités sont interconnectés pour former un circuit fermé par lequel le courant à l'intérieur de l'enroulement statorique excité est couplé à l'enroulement statorique désexcité. La forme d'onde résultante fournit une indication de la position du rotor, et le processeur utilise cette information pour exciter et désexciter les enroulements du stator.

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