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US 12,763,619 B2Granted
Electric motor with mixed magnet rotor having similar magnet blocks
AssigneeGM Global Technology Operations LLC
InventorsAli Alqarni, Alireza Fatemi, Thomas W. Nehl
Life of this patent
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Abstract
A permanent magnet rotor assembly for an electric motor, an electrified vehicle, and a method is provided. The assembly includes an annular stack of rotor lamination layers (“rotor lams”) constructed of a magnetic core material. The rotor lams have inner axial surfaces collectively defining a group of first openings through the magnetic core material and a group of second openings through the magnetic core material. The annular stack includes a first arrangement of permanent magnets and a second arrangement of permanent magnets.
Claims20
A permanent magnet rotor assembly for an electric motor, comprising:
- an annular stack of rotor lamination layers (“rotor lams”) constructed of a magnetic core material, the rotor lams having inner axial surfaces collectively defining a group of first openings through the magnetic core material and a group of second openings through the magnetic core material, wherein the annular stack includes at least one pole that includes
- a first arrangement of permanent magnets, wherein each respective permanent magnet of the first arrangement is disposed within a corresponding one of the group of first openings, and wherein the first arrangement of permanent magnets is arranged in a mixed magnet configuration having at least one low-coercivity magnet surrounded by at least two high-coercivity magnets;
- and
- a second arrangement of permanent magnets, wherein each respective permanent magnet of the second arrangement is disposed within a corresponding one of the group of second openings, wherein the second arrangement of permanent magnets is arranged in a mixed magnet configuration having at least one low-coercivity magnet surrounded by at least two high-coercivity magnets.
1 more element
An electrified vehicle, comprising:
- an electric drive system having an electric motor including
- a stator;
- and
- a permanent magnet rotor assembly for the electric motor configured to rotate due to a rotating magnetic field created by the stator, wherein the permanent magnet rotor assembly includes
- an annular stack of rotor lamination layers (“rotor lams”) constructed of a magnetic core material, the rotor lams having inner axial surfaces collectively defining a group of first openings through the magnetic core material and a group of second openings through the magnetic core material, wherein the annular stack includes at least one pole;
- a first arrangement of permanent magnets, wherein each respective permanent magnet of the first arrangement is disposed within a corresponding one of the group of first openings, and wherein the first arrangement of permanent magnets is arranged in a mixed magnet configuration having at least one low-coercivity magnet surrounded by at least two high-coercivity magnets;
- and
- a second arrangement of permanent magnets, wherein each respective permanent magnet of the second arrangement is disposed within a corresponding one of the group of second openings, wherein the second arrangement of permanent magnets is arranged in a mixed magnet configuration having at least one low-coercivity magnet surrounded by at least two high-coercivity magnets.
5 more elements
A method for manufacturing a permanent magnet rotor assembly, comprising:
- laminating a plurality of sheets of a magnetic core material to form an annular stack of rotor lams, wherein the sheets have inner axial surfaces collectively defining a group of first openings through the sheets of magnetic core material and a group of second openings through the magnetic core material;
- positioning a first arrangement of permanent magnets within a corresponding one of the group of first openings, and wherein the first arrangement of permanent magnets is arranged in a mixed magnet configuration having at least one low-coercivity magnet surrounded by at least two high-coercivity magnets;
- and
- positioning a second arrangement of permanent magnets within a corresponding one of the group of second openings, wherein the second arrangement of permanent magnets is arranged in a mixed magnet configuration having at least one low-coercivity magnet surrounded by at least two high-coercivity magnets.
1 more element
Dependencies are inferred from the claim text.