Integrated energy-momentum wheels for spacecraft

The spacecraft energy storage requirement has been traditionally met by using rechargeable electrochemical batteries. NASA-Glenn Research Center and a few industry partners are investigating the flywheel to replace battery in the spacecraft power system. With moderate component development, the flywheel offers potential benefits of longer life, reduced mass and lower cost. For greater benefits, the flywheel is being considered for dual function of energy storage for the electric power system and also momentum storage for the attitude control system. This paper presents a point design estimate of mass and volume savings in a 2500 watts low earth orbit satellite by using an integrated energy and momentum storage system. The study shows that such a system has a potential of reducing 40 percent solar array area compared to the conventional design with existing NH/sub 2/ battery and reaction wheels.