Radially repulsive magnetic bearing for self-aligning elements of coupled platforms
In certain embodiments, apparatus for self-aligning elements of coupled platforms includes a radially repulsive magnetic bearing. The radially repulsive magnetic bearing includes a first axially polarized magnet and a second axially polarized magnet that is concentrically disposed around the first axially polarized magnet and radially repulsive to the first axially polarized magnet. The radially repulsive magnetic bearing is configured to align a first element of a first platform with a second element of a second platform when the first and second platforms are coupled together.
1. An ophthalmic surgical system comprising:
a laser source configured to generate optical pulses and direct the optical pulses along an optical path defined by one or more optical elements; and
a housing configured to be coupled to a handpiece, the housing comprising a radially repulsive magnetic bearing that comprises:
a first axially polarized magnet coupled to an optical element defining the optical path;
a second axially polarized magnet concentric with and radially repulsive to the first axially polarized magnet, the second axially polarized magnet coupled to the housing; and
a thrust bearing coupled to the housing and the first axially polarized magnet, wherein the thrust bearing is configured to allow movement of the optical element coupled to the first axially polarized magnet in a direction orthogonal to the axial direction, and to counteract a magnetic force caused by the offset,
wherein the radially repulsive magnetic bearing is configured, when the housing is coupled to the handpiece, to optically align an optical element of the handpiece with the optical element coupled to the first axially polarized magnet.
2. The ophthalmic surgical system of claim 1 , wherein a magnetic neutral axis of the first and second axially polarized magnet is offset from a structural symmetrical axis of the first axially polarized magnet.
3. The ophthalmic surgical system of claim 1 , wherein an axial length of the first axially polarized magnet is not equal to an axial length of the second axially polarized magnet.
4. The ophthalmic surgical system of claim 1 , wherein the thrust bearing includes one or more of a roller bearing, a fluid bearing, a film bearing, a flexure bearing, and a magnetic bearing.
5. The ophthalmic surgical system of claim 1 , wherein the housing defines a cavity and an opening at a first end, the housing is configured to couple to the handpiece at the first end, the second axially polarized magnet is coupled to a wall of the cavity, and first axially polarized magnet is coupled to the housing via the thrust bearing at a second end of the housing opposite the first end.
6. The ophthalmic surgical system of claim 1 , wherein the housing further comprises a fastener for coupling to the handpiece, and a gap between the optical element coupled to the first axially polarized magnet and the optical element in the handpiece is defined at least in part by the thrust bearing and the fastener.
7. The ophthalmic surgical system of claim 1 , wherein the one or more optical elements that define the optical path include one or more of an optical fiber, a lens, a mirror, a prism, and a diffraction grating.