Orientation and Control Surfaces (Cont.)
•The ISS uses a mix between a GYRO and  Reactionary Control Wheels pictured in the last slide called a “Control Moment Gyroscope” (CMG). •The main difference between  Reactionary Control Wheels and a CMG is that the CMG tilts its spin Axis to induce torque which is far more efficient. Whereas a Reaction Wheel would require megawatts of power to induce the same torque, a CMG can achieve this for only a few hundred watts of power.
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https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/ISS_gyroscope.jpg/1280px-ISS_gyroscope.jpg
•CMG’s can range from having a single or dual gimbal’s and even have variable speed to provide greater accuracy and stores energy as an effective kinetic flywheel.