Permanent magnet excited electric machine and method of...

H - Electricity – 02 – H

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H02H 3/02 (2006.01) H02H 7/085 (2006.01)

Patent

CA 2400935

If an interturn short-circuit occurs in a stator coil winding of a permanent magnet excited electric machine, a short-circuit current is produced there that results in an electrically induced magnetic alternating flux which corresponds in its value to the permanent magnetic alternating flux flowing through the respective winding and which is opposite in phase. Such a short-circuit current could lead to burn-off of the turn due to its considerable strength and the loss associated therewith. To prevent this, the invention suggests in case of detection of an interturn short-circuit, to entirely short-circuit at least the coil affected by the short-circuit or to apply thereto a corresponding in-phase current and to reduce the excessive short-circuit current in the individual turn or in the individual turn section by way of this overall short-circuit current in the coil. It is thus possible to prevent burn-off of the respective turn part.

Lorsque, dans une machine électrique excitée par aimant permanent, il se produit un court-circuit dans un enroulement de bobine de stator, un courant de court-circuit est généré à cet emplacement, lequel a pour conséquence un flux alternatif magnétique induit électriquement, dont l'amplitude correspond au flux alternatif magnétique permanent traversant l'enroulement concerné et qui est opposé en phase à ce flux alternatif magnétique permanent. Un tel courant de court-circuit pourrait, étant donné sont intensité considérable et la perte qui y est associée, provoquer la combustion de l'enroulement. Pour empêcher cela, il est proposé, selon l'invention que, lorsqu'un court-circuit d'enroulement est reconnu, au moins la bobine concernée par ce court-circuit soit mise en court-circuit ou bien alimentée avec ce courant correspondant et commandée avec accord de phase et que, sur la base de ce courant de court-circuit total, dans la bobine, le courant de court-circuit suraccentué soit réduit dans l'enroulement individuel ou dans la partie d'enroulement individuelle. Ainsi, la combustion de la partie d'enroulement concernée est évitée.

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