MAGNETICALLY SUSPENDED COMPOSITE FLYWHEELS FOR INERTIAL ENERGY STORAGE

THE SUCCESSFUL DESIGN OF MAGNETICALLY SUSPENDED INERTIAL FLYWHELLS FOR ENERGY STORAGE IS DEPENDENT UPON COMPOSITE MATERIALS, MAGNETIC SUSPENSION AND MOTOR/GENERATOR. THIS STUDY IS CONCERNED WITH THE CONCEPTUAL DESIGN AND ANALYSIS OF A 500 WH SYSTEM BASED UPON TWO TECHNOLOGICAL INNOVATIONS.THESE ARE COMPOSITE MATERIAL FLYWHEEL FOUR DEGREES OF CONTROL FOR MAGNETIC SUSPENSION THE FIRST IS IMPORTANT SINCE CURRENT MATERIALS ARE UNABLE TOWITHSTAND THE RADIAL STRESSES AT THE HIGH SPEEDS REQUIRED FOR EFFICIENT ENERGY STORAGE. FOR SPACECRAFT APPLICATIONS AMAGNETICALLY SUSPENDED MULTI-RING FLYWHEEL OFFERS SIGNIFICANT ADVANTAGES IN SPECIFIC ENERGY DENSITY (SED) COMPARED TO ELECTROCHEMICAL SYSTEMS. TO REALIZE THESE ADVANTAGES THE HIGH SPECIFIC STRENGTHS OF FILAMENT WOUND COMPOSITE MATERIALS WILL BE REQUIRED. ACTIVE MAGNETIC SUSPENSION IN FOUR DEGREES OF FREEDOM IS NECESSARY SINCE IT HAS BEEN NOTED THAT PERTURBATION ORTHOGONAL TO THE SPIN AXISAS WELL AS DYNAMIC CROSS-COUPLING RENDER THE SYSTEM TO CHATTER AND BECAME UNSTABLE IF ONLY THE RADIAL MOTION IS STABALIZED. ANY NEW DESIGN MUST ADDRESS THIS VERY IMPORTANTISSUE FOR HIGH SPEED APPLICATION. THE SPECIFIC OBJECTIVES OF THE STUDY INCLUDE DESIGN OF A MULTI-RING FLYWHEEL TO WITHSTAND HIGH RADIAL STRESSES DESIGN OF A CONTROL SYSTEM FOR STABILIZING IN FOUR DEGREES OF FREEDOM IDENTIFICATION OF ISSUES PERTAINING TO ATTITUDE CONTROL, INTERFACING, POWER CONDITIONING AND MODULARITY.