F - Mech Eng,Light,Heat,Weapons – 16 – C
Patent
F - Mech Eng,Light,Heat,Weapons
16
C
308/2
F16C 32/04 (2006.01) F16C 39/06 (2006.01)
Patent
CA 1169902
LINEAR MAGNETIC BEARING Abstract A linear magnetic bearing includes a stator member stationary relative to x, y and z axes and having a longitudinal axis on the z axis as well as a member longitudinally translatable relative to said axes. The translatable member is controlled to have a longitudin- al axis coincident with the z axis. Permanent magnet means on one of the members positions the translatable member in a plane defined by the x-y axes relative to the stationary member. The position of the translatable member is sensed by sensors relative to the stationary member in the plane defined by the x-y axes. Electro-magnet means on one member responds to the sensor to center the longitudinal axis of the translatable member on the z axis. First low reluctance magnetic flux paths for the permanent magnet means exist through both of the members and a radial air gap between the members. Second low reluctance magnetic flux paths exist for the electro-magnet means through both of the members and a radial air gap so no net force is applied to the translatable member in the direction of the z axis by either the permanent magnet means or the electro-magnet means. The first and second low reluctance flux paths are arranged so that both the electro-magnets and permanent magnets share: a common air gap but the electro-magnet fluxes do not pass through the high reluctance permanent magnets. One of the members includes two fixedly spaced elements along the z axis. Each fixedly spaced element has four radial pole faces for the permanent magnet flux pathe. At least two of the radial pole faces of each element provide x and/or y position control via the electro-magnet flux interaction with the permanent magnet flux in the common air gaps.
386123
Gowling Lafleur Henderson Llp
National Aeronautics And Space Administration
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