NASA 1996 SBIR Phase I

PROJECT TITLE : : Energy Momentum Wheels (EMWs) For Satellites and Other Applications With Gain-Scheduled Controllers

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

The proposed research project will address the application of Energy Momentum Wheels (EMWs), in the form of a high energy density rotor supported in active magnetic bearings, to satellite systems through the use of robust control algorithms. An EMW combines the function of energy storage (a battery) and momentum management (an attitude control momentum wheel) into a single device. Two such devices may be able to provide the complete energy storage and attitude control for many satellite missions. The successful application of the EMW to satellite systems holds the promise of significantly reducing a satelliteÕs mass and cost when contrasted with traditional satellite architecture which separates energy storage and momentum management functions. Active magnetic bearing technology, in particular, is of critical importance for an efficient EMW, due to advantages which include very high speed operation, no lubrication requirement, no wear, low power consumption, and active vibration control capability. Currently, control algorithms for magnetic bearing-supported flywheels do not have the desired adaptive and damping properties for EMWs. In the proposed research project Gain-Scheduled Controllers will be investigated and developed. Additionally, a preliminary experimental validation will be performed to demonstrate stability, robustness, automatic balancing and vibration reduction of active magnetic bearings for EMW systems.

AFS is convinced that the successful magnetic bearing controller and associated magnetic bearing design development and test program, as proposed herein, will offer an absolutely crucial enabling technology foundation for full commercialization and timely deployment of Electro-Mechanical Flywheel Batteries (EMFBÕs). This EMFB program will provide a pivotal technological base for electric vehicle (EV) propulsion, an energy storage and delivery system for industrial and utility use and the ability to support renewable energy such as from solar or wind power.

Mr. John V. Coyner
American Flywheel Systems, Inc.
17700 West Colfax
Golden, CO 80401

American Flywheel Systems, Inc.
Post Office Box 449
Medina Washington 98039