Apparatus for providing torque and for storing momentum energy

Details Apparatus for providing torque and for storing momentum energy Apparatus for providing torque and for storing momentum energy

1995-02-21

1998-03-03

LaBalle, Clinton

Electrical generator or motor structure

Dynamoelectric

Rotary

310 41, 310 76, 252 41, 252 54, 290 36, H02K 702

Patent

active

057239231

ABSTRACT:
A torque reaction/momentum wheel device for attitude control of a body, such as a spacecraft, having a motor driven flywheel with the flywheel at one end of a shaft and cantilevered with respect to at least two bearings which support the shaft which is common to the motor and flywheel, all having substantially the same spin axis. A housing which supports the motor and bearings is located all on one side of the flywheel which allows the flywheel to be balanced while mounted onto the shaft thus reducing dynamic unbalance forces. A cover is placed over the flywheel, motor, and housing so that the torque reaction/momentum wheel device can be pressurized which is necessary to prevent the bearing lubricant from migrating or evaporating out of the bearings. The bearings are lubricated by a grease which has low drag torque characteristics. This grease is a diester based oil with a lithium soap additive and filtered so that all particles are less than 10 microns in size. Because of the low drag torque, less power is required to rotate the flywheel to achieve a given level of torque or momentum storage.

REFERENCES:
patent: 3582986 (1971-06-01), Yokoyama
patent: 3640859 (1972-02-01), Messina et al.
patent: 3691413 (1972-09-01), Russell
patent: 3819966 (1974-06-01), Noguchi
patent: 4223240 (1980-09-01), Theyse
patent: 4589534 (1986-05-01), Apetrie et al.
patent: 4613761 (1986-09-01), Yabunaka et al.
patent: 4712660 (1987-12-01), Erndt et al.
patent: 4879054 (1989-11-01), Waynick
patent: 5390554 (1995-02-01), Silvent

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