A rotary electric machine

H - Electricity – 02 – K

Patent

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Details

H02K 19/26 (2006.01) H02K 19/36 (2006.01) H02P 9/02 (2006.01) H02K 3/40 (2006.01)

Patent

CA 2305422

A rotary electric machine of alternating current type designed to be connnected directly to a distribution or transmission network comprises at least one electric winding. The winding comprises at least one electric conductor, a first layer with semiconducting properties surrounding the conductor, a solid insulating layer surrounding the first layer and a second layer with semiconducting properties surrounding the insulating layer. A brushless excitation system, switchable between positive and negative excitation, is also arranged for excitation of the machine. An electric power plant comprises such a rotary electric machine. In a method of exciting a rotary electric machine with both positive and negative excitation current direction, a two-way field over-voltage protection means (8, 10, 12, 14) or a two-way discharge circuit is connected temporarily across the field winding (4) of the machine.

L'invention a trait à une machine électrique rotative, du type à courant alternatif, conçue pour être directement connectée à un réseau de distribution ou de transmission. L'enroulement de la machine comprend au moins un conducteur électrique, une première couche à propriétés semi-conductrices entourant le conducteur, une couche isolante solide entourant cette première couche et une seconde couche à propriétés semi-conductrices entourant la couche isolante. Un circuit d'excitation sans balais, commutable d'une excitation positive à une excitation négative, sert à exciter cette machine. Une centrale électrique peut être pourvue de cette machine électrique rotative. Selon une technique d'excitation de la machine électrique rotative par un courant d'excitation de sens à la fois positif et négatif, on connecte momentanément aux bornes de l'enroulement inducteur (4) de la machine un dispositif bidirectionnel de protection contre les surtensions survenant au niveau du champ (8, 10, 12, 14) ou un circuit bidirectionnel de décharge.

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