Magnet having regions of different magnetic properties and method for forming such a magnet
AssigneeABB Schweiz AG
InventorsReinhard Simon, Jacim Jacimovic, Darren Tremelling, Felix Greuter, Erik Johansson, Tomaz Tomse
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Abstract
This application concerns a magnet having a magnet body as well as a method for manufacturing such a magnet. The magnet body has a first region with first magnetic properties and a second region with second magnetic properties that are different to the first properties. Owing to the manufacturing process of the magnet body, the relative location of the first region and the second region within the magnet body is freely predeterminable.
Claims30
A magnet including a one-piece magnet body comprising
- a first region with first magnetic properties,
- a second region with second magnetic properties that are different to the first properties, wherein the first region has at least one of a coercivity and a remanence value that is different from the value of the second region,
- wherein the location of the first region and the second region within the magnet body is freely predeterminable,
- wherein the first region has a different microstructure than the second region,
- wherein an average size of magnetic grains in the first region is larger than an average size of magnetic grains in the second region,
- wherein the first region comprises a composition with a first member of RE, Iron and Boron,
- wherein the first member of RE is a rare earth element of the Lanthanide series,
- wherein the second region comprises a composition with a second member of RE, Iron and Boron,
- wherein the second member of RE comprises at least one rare earth element of the Lanthanide series that is absent in the first member, and
- wherein a region depth of the second region extending perpendicularly to a surface of the magnet body is at least 1 mm.
A method of producing a one-piece magnet having a magnet body comprising a first region with first magnetic properties and a second region with second magnetic properties that are different to the first properties, wherein the first region has at least one of a coercivity and a remanence value that is different from the value of the second region, wherein the first region has a different microstructure than the second region, wherein an average size of magnetic grains in the first region is larger than an average size of magnetic grains in the second region, wherein the first region comprises a composition with a first member of RE, Iron and Boron, wherein the first member of RE is a rare earth element of the Lanthanide series, wherein the second region comprises a composition with a second member of RE, Iron and Boron, wherein the second member of RE comprises at least one rare earth element of the Lanthanide series that is absent in the first member, and wherein a region depth of the second region extending perpendicularly to a surface of the magnet body is at least 1 mm, the method comprising the following steps:
- a) forming a first layer belonging to the first region by depositing a plurality of first powder portions on a first predetermined area of the magnet to be built each, and by fusing the plurality of first powder portions to one another such that magnetic grains are formed;
- b) forming a second layer belonging to the second region by depositing a plurality of second powder portions on a second predetermined area of the magnet to be built each, and by fusing the plurality of second powder portions to one another such that magnetic grains are formed;
- c) forming a third layer belonging to the first region on top of the first layer in a building direction of the magnet by depositing a plurality of first powder portions on a third predetermined area of the magnet to be built each, and by fusing the plurality of first powder portions to one another such that magnetic grains are formed;
- d) forming a fourth layer belonging to the second region on top of the second layer in the building direction of the magnet by depositing a plurality of second powder portions on a fourth predetermined area of the magnet to be built each, and by fusing the plurality of second powder portions to one another such that magnetic grains are formed.
Dependencies are inferred from the claim text.