Electric machine
AssigneeVolvo Car Corporation
InventorsAlexandra Tokat, Kim Bergsro
Life of this patent
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Abstract
An electric machine for a vehicle including a stator, and a rotor including a plurality of poles. Each pole includes a first flux barrier; and a second flux barrier adjacent to and radially outward from the first flux barrier. Each of the first flux barrier and the second flux barrier includes a central ferrite magnet in a central duct, and first and second rare earth magnets on each side of the ferrite magnet in outer ducts extending from each end of the central duct at an angle.
Claims17
An electric machine for a vehicle, the electric machine comprising:
- a stator, and
- a rotor comprising a plurality of poles, wherein each pole comprises:
- a first flux barrier;
- and
- a second flux barrier adjacent to and radially outward from the first flux barrier;
- each of the first flux barrier and the second flux barrier comprising a central ferrite magnet in a central duct, and first and second rare earth magnets on each side of the ferrite magnet in outer ducts extending from each end of the central duct at an angle,
- wherein the outer ducts for the rare earth magnets connect with the central duct for the central ferrite magnet,
- wherein each of the outer ducts are generally a rectangular prism shape with a taper toward the outer edges, and
- wherein each of the central ferrite magnet and first and second rare earth magnets is a rectangular prism.
A method of forming an electric machine, the method comprising:
- forming a rotor with a central duct and two outer ducts connecting to and extending radially outward from ends of the central duct at an angle toward an outer circumference of the rotor, each of the central and outer ducts having a rectangular cross-section, and each of the outer ducts are generally a rectangular prism shape with a taper toward the outer edges;
- inserting a ferrite magnet in the central duct;
- and
- inserting rare earth magnets in each of the outer ducts, wherein each of the ferrite magnet and the rare earth magnets is a rectangular prism.
An electric machine, comprising:
- a stator, and
- a rotor comprising a plurality of poles, where each pole comprises one or more flux barriers, each of the one or more flux barriers comprising a rectangular prism shaped central ferrite magnet in a central duct, and first and second rectangular prism shaped rare earth magnets on each side of the ferrite magnet in outer ducts connecting to the central duct and extending from each end of the central duct at an angle, wherein each of the outer ducts have a taper toward the outer edges.
Dependencies are inferred from the claim text.