Rotary electrical machines

H - Electricity – 02 – K

Patent

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Details

H02K 21/24 (2006.01) H02K 1/27 (2006.01) H02K 3/26 (2006.01) H02K 21/00 (2006.01)

Patent

CA 2330113

A rotary electrical machine comprising a stator (10) and at least one rotor (12) having a plurality of permanent magnets (14). The rotor consists of a rotor disc, at the outer edge of which the permanent magnets are mounted. The rotor disc (12) is provided with airgap varying means (19) which are angled towards the stator (10) and mounted on the rotor hub (24) for rotation therewith. When the rotor is stationary, the airgap (30) between the magnets (14) and the stator (10) is at a minimum. In operation, as the speed of rotation of the rotor (12) increases, a centrifugal force is generated which acts to bend the airgap varying means (19) and, therefore, the rotor disc (12) back, away from the stator (10), thereby drawing the magnets (14) away from the stator and increasing the size of the airgap (30). The increase in size of the airgap results in a corresponding decrease in flux and therefore a decrease in the maximum output voltage for that rotor speed. In this way, the output voltage of the machine is kept substantially constant. A stationary iron ring (32) may be provided on the stator (10) to assist in drawing away flux as the size of the airgap is increased.

La présente invention concerne une machine électrique tournante comprenant un stator (10) et au moins un rotor (12) muni de plusieurs aimants permanents (14). Le rotor est composé d'un disque de rotor, sur le bord extérieur duquel sont montés les aimants permanents. Le disque de rotor (12) est doté de moyens (19) de modification d'entrefer qui forment un angle par rapport au stator (10) et qui sont montés sur le moyeu (24) du rotor de façon qu'ils tournent avec ce dernier. Lorsque le rotor est au repos, l'entrefer (30) entre les aimants (14) et le stator (10) se trouve à sa taille minimale. Lorsque le rotor fonctionne, au fur et à mesure que la vitesse de rotation du rotor (12) augmente, elle génère une force centrifuge qui fait fléchir les moyens (19) de modification d'entrefer, éloignant le disque de rotor (12) et les aimants (14) du stator (10) et augmentant la taille de l'entrefer (30). L'augmentation de la taille de l'entrefer entraîne une réduction correspondante du flux et, par conséquent, une réduction de la tension de sortie maximale à cette vitesse de rotor. De cette manière, la tension de sortie de la machine est maintenue sensiblement constante. Un anneau de fer fixe (32) peut être placé sur le stator (10) afin de faciliter l'éloignement du flux au fur et à mesure que la taille de l'entrefer augmente.

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