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US 2020/0028391 A1Published application
Permanent magnet, method for manufacturing same, and motor comprising same
AssigneeLG Innotek Co., Ltd.
InventorsJong Soo HAN, Seok BAE, Young Jae LEE, Dong Hyeok CHOI, Jung Eun LEE
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Abstract
A permanent magnet of an embodiment comprises: a base magnet represented by a-b-c (a includes a rare earth-based element, b includes a transition element, and c includes boron (B)); and a coating layer coated on a surface of the base magnet, wherein the coating layer comprises a compound containing a metal having magnetism, the compound including: a phosphor (P); and a metal belonging to the fourth period in the periodic table.
Claims21
A permanent magnet, comprising:
- a base magnet denoted by “a-b-c” (where “a” comprises a rare-earth-based element, “b” comprises a transition element, and “c” comprises boron (B));
- a first coating layer coated on a first surface of the base magnet;
- and
- a second coating layer coated on a second surface of the base magnet, other than the first surface of the base magnet,
- wherein the first coating layer comprises a compound comprising a magnetic metal, and
- wherein the compound comprises:
- phosphorus (P);
- and
- a metal from Group 4 of a Periodic Table.
6 more elements
9-10. (canceled)
A motor, comprising:
- a stator in which a cylindrical-shaped through-hole is formed;
- a plurality of stator-winding slots disposed in an inner circumferential surface of the stator;
- a rotor disposed in the through-hole in the stator;
- and
- a plurality of permanent magnets coupled to the rotor,
- wherein each of the permanent magnets comprises:
- a base magnet denoted by “a-b-c” (where “a” comprises a rare-earth-based element, “b” comprises a transition element, and “c” comprises boron (B));
- a first coating layer coated on a first surface of the base magnet;
- and
- a second coating layer coated on a second surface of the base magnet, other than the first surface of the base magnet,
- wherein the first coating layer comprises a magnetic metal and has a reversible temperature coefficient for Hci of −0.35 to −0.05%/K, and
- wherein the second coating layer has a thermal conductivity of 100 W/(m·K) or more.
9 more elements
Dependencies are inferred from the claim text.