Multiple ring polefaceless permanent magnet and method of making
AssigneeGeneral Electric Company
InventorsKathleen Melanie Amm, Evangelos Trifon Laskaris, Paul Shadforth Thompson, Bulent Aksel, Bruce Campbell Amm, Michael Anthony Palmo, Jr, Johannes Martinus Van Oort, Xianrui Huang
Life of this patent
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Abstract
A permanent magnet assembly for an imaging apparatus having a permanent magnet body having a first surface and a stepped second surface which is adapted to face an imaging volume of the imaging apparatus, wherein the stepped second surface contains at least four steps.
Claims13
A permanent magnet assembly for an imaging apparatus comprising a permanent magnet body having a first surface and a stepped second surface which is adapted to face an imaging volume of the imaging apparatus, wherein the stepped second surface contains at least four steps, the permanent magnet body comprising:
- a cylindrical base section having a major first surface attached to the at least one layer of a soft magnetic material and a major second surface having at least three steps such that at least two of the steps in the second surface of the base section are machined into the second surface of the base section, wherein the second surface of the base section is opposite to the first surface of the base section, wherein the base section comprises at least two layers of permanent magnet blocks, and wherein the at least one layer of the soft magnetic material is attached to a substantially flat first surface of the permanent magnet body;
- a hollow ring section attached to an outer portion of the second surface of the base section, wherein the first and second surfaces of the base section and the first and second surfaces of the hollow ring section are arranged substantially perpendicular to a direction of a magnetic field of the magnet assembly, wherein the stepped second surface of the permanent magnet body comprises the second surface of the hollow ring section and a portion of the second surface of the base section that is not covered by the ring section, and wherein the second surface of the ring section extends at least 0.05 meters above an outer step on the second surface of the base section to form a pocket.
A permanent magnet assembly for an imaging apparatus comprising a permanent magnet body having a first surface and a stepped second surface which is adapted to face an imaging volume of the imaging apparatus, wherein the stepped second surface contains at least four steps, wherein a movable permanent magnet body is movable with respect to the second surface of permanent magnet body.
A permanent magnet assembly for an imaging apparatus comprising a permanent magnet body having a first surface and a stepped second surface which is adapted to face an imaging volume of the imaging apparatus, wherein a central step of the stepped second surface comprises a protrusion, the permanent magnet body comprising:
- a cylindrical base section having a major first surface attached to the at least one layer of a soft magnetic material and a major second surface having at least three steps such that at least two of the steps in the second surface of the base section are machined into the second surface of the base section, wherein the second surface of the base section is opposite to the first surface of the base section, wherein the base section comprises at least two layers of permanent magnet blocks, and wherein the at least one layer of the soft magnetic material is attached to a substantially flat first surface of the permanent magnet body;
- a hollow ring section attached to an outer portion of the second surface of the base section, wherein the first and second surfaces of the base section and the first and second surfaces of the hollow ring section are arranged substantially perpendicular to a direction of a magnetic field of the magnet assembly, wherein the stepped second surface of the permanent magnet body comprises the second surface of the hollow ring section and a portion of the second surface of the base section that is not covered by the ring section, and wherein:
- the second surface of the ring section extends at least 0.05 meters above an outer step on the second surface of the base section to form a pocket;
- and
- a height of the at least three steps in the base section is less than 0.03 meters.
A permanent magnet assembly for an imaging apparatus comprising a permanent magnet body having a first surface and a stepped second surface which is adapted to face an imaging volume of the imaging apparatus, wherein a central step of the stepped second surface comprises a protrusion, and wherein a movable permanent magnet body is movable with respect to the second surface of the permanent magnet body.
Dependencies are inferred from the claim text.