Permanent magnet rotors and methods of manufacturing the same
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsScott Michael Ankeney, Kenji Nakamura
Life of this patent
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Abstract
A rotor for an electrical motor includes a spindle, a plurality of sintered permanent magnets arranged around the spindle, a compacted powdered soft magnetic material at least partially surrounding the plurality of sintered permanent magnets, and a plurality of discrete regions of compacted powdered non-magnetic material at least partially surrounding the plurality of sintered permanent magnets. The discrete regions of non-magnetic material are at least partially embedded in the soft magnetic material and the soft magnetic material and the non-magnetic material couple the plurality of sintered permanent magnets with the spindle.
Claims18
A rotor for an electrical motor, comprising:
- a spindle;
- a plurality of sintered permanent magnets arranged around the spindle;
- an unsintered compacted powdered soft magnetic material at least partially surrounding the plurality of sintered permanent magnets;
- and
- a plurality of discrete regions of unsintered compacted powdered non-magnetic material at least partially surrounding the plurality of sintered permanent magnets, the plurality of discrete regions of non-magnetic material being at least partially embedded in the soft magnetic material, wherein the soft magnetic material and the plurality of discrete regions of non-magnetic material couple the plurality of sintered permanent magnets with the spindle.
An alternating current synchronous electric motor comprising:
- a stator comprising a plurality of windings;
- a rotor arranged to rotate within an interior of the stator, the rotor comprising:
- a spindle;
- a plurality of sintered permanent magnets arranged around the spindle;
- an unsintered compacted powdered soft magnetic material at least partially surrounding the plurality of sintered permanent magnets;
- and
- a plurality of discrete regions of unsintered compacted powdered non-magnetic material at least partially surrounding the plurality of sintered permanent magnets, wherein the soft magnetic material and the plurality of discrete regions of non-magnetic material couple the plurality of sintered permanent magnets with the spindle, and
- wherein the plurality of sintered permanent magnets create a plurality of localized magnetic fields that interact with an alternating electrical current that passes through the plurality of windings of the stator.
Dependencies are inferred from the claim text.