Integrated hydraulic damper for torsional oscillation reduction
AssigneeHamilton Sundstrand Corporation
InventorRichard A. Himmelmann
Life of this patent
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Abstract
A rotor assembly of an electric machine includes a rotor body and a shaft assembly located at a central axis of the rotor assembly, and operably connected to the rotor body. The shaft assembly includes a main rotor shaft operably connected to the rotor body, a center drive shaft located inside of the main rotor shaft, and a hydraulic damper sleeve located radially between the main rotor shaft, defining a plurality of cavities between the hydraulic damper sleeve and the center drive shaft. The hydraulic damper sleeve is configured to urge a fluid into and out of the plurality of cavities thereby damping relative circumferential motion between the main rotor shaft and the center drive shaft.
Claims19
A rotor assembly of an electric machine, comprising:
- a rotor body;
- a shaft assembly disposed at a central axis of the rotor assembly, and operably connected to the rotor body, the shaft assembly including:
- a main rotor shaft operably connected to the rotor body;
- a center drive shaft disposed inside of the main rotor shaft;
- and
- a hydraulic damper sleeve disposed radially between the main rotor shaft and the center drive shaft, defining a plurality of cavities between the hydraulic damper sleeve and the center drive shaft, the hydraulic damper sleeve configured to urge a fluid into and out of the plurality of cavities thereby damping relative circumferential motion between the main rotor shaft and the center drive shaft.
An electric machine, comprising:
- a housing;
- a stator disposed in the housing;
- and
- a rotor assembly disposed in the housing and defining an air gap to the stator, the rotor assembly including:
- a rotor body;
- a shaft assembly disposed at a central axis of the rotor assembly, and operably connected to the rotor body, the shaft assembly including:
- a main rotor shaft operably connected to the rotor body;
- a center drive shaft disposed inside of the main rotor shaft;
- and
- a hydraulic damper sleeve disposed radially between the main rotor shaft and the center drive shaft, defining a plurality of cavities between the hydraulic damper sleeve and the center drive shaft, the hydraulic damper sleeve configured to urge a fluid into and out of the plurality of cavities thereby damping relative circumferential motion between the main rotor shaft and the center drive shaft.
Dependencies are inferred from the claim text.