Rotor for an electric machine
First Claim
Patent Images
1. A rotor for an electrical machine, comprising:
- a rotor hub; and
a plurality of permanent magnet segments affixed around a perimeter of the rotor hub,a first plurality of the permanent magnet segments of substantially uniform arcuate span, anda multi-piece permanent magnet segment comprising two pieces each having a smaller arcuate span than the first plurality of permanent magnet segments, a magnetization direction vector of one of the pieces is different than a magnetization direction vector of at least one other piece in the multi-piece segment.
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Abstract
A rotor for an electrical machine includes a rotor hub and a plurality of permanent magnet segments affixed around a perimeter of the rotor hub. A first plurality of the permanent magnet segments have a substantially uniform arcuate span and are formed of a single unitary piece of material. A multi-piece permanent magnet segment includes at least two pieces, each having a smaller arcuate span than the first plurality of segments. The magnetization direction vector of one piece different than the magnetization direction vector of at least one other piece in each multi-piece segment.
317 Citations
21 Claims
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1. A rotor for an electrical machine, comprising:
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a rotor hub; and a plurality of permanent magnet segments affixed around a perimeter of the rotor hub, a first plurality of the permanent magnet segments of substantially uniform arcuate span, and a multi-piece permanent magnet segment comprising two pieces each having a smaller arcuate span than the first plurality of permanent magnet segments, a magnetization direction vector of one of the pieces is different than a magnetization direction vector of at least one other piece in the multi-piece segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A permanent magnet segment for a the rotor of an electrical machine, the permanent magnet adapted to mount to the rotor in forming a section of a cylindrical outer surface of the rotor, the permanent magnet segment comprising:
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a first permanent magnet section having a first magnetization direction vector; and a second permanent magnet section affixed to the first permanent magnet section and having a magnetization direction vector different than the first magnetization direction vector. - View Dependent Claims (15, 16, 17, 18)
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19. A method of forming a rotor for an electric machine, comprising:
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affixing a first plurality of permanent magnet segments of uniform arcuate span to a perimeter of a rotor hub; and affixing a multi-piece permanent magnet segment to the perimeter of the rotor hub, the multi-piece segment comprising two pieces each having a smaller arcuate span than the first plurality of permanent magnet segments, a magnetization direction vector of a first piece is different than a magnetization direction vector of a second piece in the multi-piece segment. - View Dependent Claims (20, 21)
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Specification