Patent ID: 8596151

Claim:
A momentum exchange assembly, comprising: an outer housing; and an inner gimbal assembly disposed within the outer housing, the inner gimbal assembly including: a stator housing; a rotor assembly disposed at least partially within the stator housing, the rotor assembly including a shaft and an inertial element fixedly coupled to the shaft; a first spin bearing mounted to a first end of the shaft; a bearing cartridge surrounding the first spin bearing, the bearing cartridge having a first end, a second end, and a bearing cartridge channel extending from the first end of the bearing cartridge to the second end of the bearing cartridge; and a spin motor disposed within the stator housing and around the shaft, the spin motor including a spin motor rotor and a spin motor stator, the spin motor rotor coupled to the rotor assembly, and the spin motor stator disposed around a portion of the spin motor rotor and coupled to the stator housing, wherein: a first end cavity is partially defined by the first end of the bearing cartridge, a first intermediary cavity is defined by a first portion of an outer surface of the spin motor, a first portion of a surface of the rotor assembly, and the second end of the bearing cartridge, and the bearing cartridge channel provides flow communication between the first end cavity and the first intermediary cavity.