Anti-cogging apparatus for permanent magnet electrical machines

Details Anti-cogging apparatus for permanent magnet electrical machines Anti-cogging apparatus for permanent magnet electrical machines

H - Electricity

02

K

H02K 1/06 (2006.01) H02K 7/00 (2006.01) H02K 21/02 (2006.01)

Patent

CA 2711543

The present invention provides cancellation of the cogging torque of a permanent magnet electrical machine using two sets of magnetic elements, one set being mechanically coupled to the stator and the other set being mechanically coupled to the rotor of the machine. At least one of the two set comprises permanent magnets and the magnetic elements of the other set can be made of permanent magnets or non-magnetized ferromagnetic materials such as soft iron. When the arrangement of the elements of the two sets are properly designed, magnetic attraction and repulsion forces between the magnetic elements of the two sets as the machine operates produces an anti-cogging torque that substantially cancels out the cogging torque of the machine.

L'invention a pour but de supprimer le couple d'encoches d'une machine électrique à aimants permanents au moyen de deux groupes d'éléments magnétiques, un groupe étant couplé mécaniquement au stator et l'autre étant couplé mécaniquement au rotor de la machine. Au moins un des deux groupes comprend des aimants permanents et les éléments magnétiques de l'autre groupe peuvent être constitués d'aimants permanents ou de corps ferromagnétiques non aimantés tels que du fer doux. Si les éléments des deux groupes sont correctement agencés, les forces d'attraction et de répulsion magnétiques entre les éléments magnétiques des deux groupes, lorsque la machine est en marche, créent un couple de suppression de l'effet d'encoches qui neutralise sensiblement le couple d'encoches de la machine.

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