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US 10,541,577 B2Granted
Utilization of magnetic fields in electric machines having skewed rotor sections and separators with cutouts
AssigneeFord Global Technologies, LLC
InventorsFranco Leonardi, Mark Allan Lippman, Michael W. Degner, Feng Liang
Life of this patent
Estimating the term…
Abstract
An electric machine may include an adjacent pair of laminations each defining pockets having permanent magnets arranged therein to form magnetic poles. The laminations may be stacked in a pole-skewed fashion to form a portion of a rotor. A stator may surround the rotor. The machine may further include a separator lamination between the adjacent pair defining cutout portions having a shape based on a superposition of shapes of the pockets to increase a reluctance of leakage paths between the permanent magnets.
Claims12
A rotor comprising:
- a ferromagnetic separator section disposed between and in contact with a pair of pole-skewed sections, and defining cutout portions that have a shape based on a superposition of permanent magnet pocket shapes associated with the pair of pole-skewed sections and devoid of jagged edge portions, wherein the cutout portions extend radially inward from an outer edge of the ferromagnetic separator section, the cutout portions being configured to impede magnetic flux leakage between permanent magnets.
A rotor comprising:
- a ferromagnetic separator section disposed between and in contact with a pair of pole-skewed sections, and defining cutout portions that have a shape based on a superposition of permanent magnet pocket shapes associated with the pair of pole-skewed sections and devoid of jagged edge portions, wherein the cutout portions open to an airgap between the ferromagnetic separator section and a stator surrounding the rotor, the cutout portions being configured to impede magnetic flux leakage between permanent magnets.
Dependencies are inferred from the claim text.