| 摘要 |
A rotor assembly includes a rotor assembly housing, a shaft, a bearing assembly coupling the shaft to the rotor assembly housing, and a mass structure coupled to and rotatable with the shaft. The bearing assembly includes a bearing housing, a first raceway defined in the bearing housing, a second raceway defined in the shaft, and a plurality of ball bearings positioned within the first and second raceways to enable the shaft to rotate relative to the rotor assembly housing.
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