The main objective of this research is to improve the feasibility of Energy Momentum Wheels for satellite systems through the development of robust LTI and gain-scheduled controllers for high-speed flywheel rotors supported on active magnetic bearings. A hybrid combination between H_∞ loop-shaping and μ-synthesis is used in this paper to design controllers. In order to reduce the computational complexity of the control designs and the order of the synthesized controllers, a method is devised in this paper to reduce the number of states that depend on the rotor speed. The rotor speed is treated as uncertainty in an LTI controller design and is used as a scheduling variable for a gain-scheduled framework. The success of the methodology used is demonstrated through numerical simulation and experimental results.