Rotary permanent magnet electric motor with varying air gap...

H - Electricity – 02 – K

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H02K 21/12 (2006.01) H02K 1/14 (2006.01) H02K 1/18 (2006.01) H02K 1/22 (2006.01) H02K 1/26 (2006.01) H02K 1/27 (2006.01) H02K 21/22 (2006.01)

Patent

CA 2482974

A permanent magnet motor is configured with selective variation of the radial distance between an interfacing pair of rotor permanent magnet and stator pole along the circumferential length of the pair. The effects of cogging torque on the overall torque signature can be controlled by setting an appropriate air gap variation profile. The stator pole and rotor magnet surfaces may be sloped with respect to each other, the angle therebetween being selected to obtain desired cogging torque compensation. Other air gap variation profiles may include provision of concave surfaces, the degree of concavity being selectable.

Un moteur à aimant permanent est configuré avec une variation sélective de la distance radiale entre une paire d'interface d'aimant permanent de rotor et de pôle de stator, sur la longueur circonférentielle de cette paire. L'établissement d'un profil de variation d'entrefer approprié permet de maîtriser les effets du couple de crantage sur la caractéristique de couple globale. Les surfaces du pôle de stator et de l'aimant de rotor peuvent être inclinées l'une par rapport à l'autre, l'angle qui les sépare étant choisi de façon à obtenir la compensation de couple de crantage souhaitée. D'autres profils de variation d'entrefer peuvent comprendre des surfaces concaves à degré de concavité réglable.

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