Patent ID: 8222789
Filing Date: 2012-07-17
Classification: B60L,H02K,Y02T

Abstract:
1. A disk motor comprising: a rotor disk having a peripheral edge and a plurality of permanent magnets distributed along a plurality of essentially circular substantially concentric paths, said paths being located inwardly of said peripheral edge; and a stator assembly positioned in facing relation to said rotor disk, said stator assembly having a mounting plate with a peripheral edge, a plurality of pole pieces distributed on said mounting plate along a plurality of essentially circular substantially concentric paths located inwardly of said peripheral edge of said mounting plate, a plurality of coils each arranged about a corresponding one of said plurality of pole pieces, said plurality of coils being grouped into a plurality of phase groups, said pole pieces being movably mounted on said mounting plate for translatory motion in a direction generally normal to said mounting plate between a first position in which a maximum air gap is established between the confronting surfaces of the pole piece and individual ones of said plurality of permanent magnets and a second position in which a minimum air gap is established between the confronting surfaces of the pole piece and said individual ones of said plurality of permanent magnets, and a plurality of biasing devices each associated to a different one of said plurality of pole pieces for maintaining the associated one of said plurality of pole pieces in said first position when the corresponding coil is deactivated and for permitting the associated one of said plurality of pole pieces to be moved to said second position when the corresponding coil is activated.