Motor design for a high-speed electrically-driven Gyroscope

A GYROSCOPE is a wheel or disk which rotates about an axis through its center (called spin axis) and which is also capable of rotation about one or more axes perpendicular to the spin axis and to each other. If the wheel is mounted so it is capable of rotation about three intersecting axes, it is said to be unconstrained with respect to rotation and possesses then the well-known and interesting property of maintaining the plane of its spin axis fixed in space as long as no external forces are applied to it. This property has been made use of in gyrocompasses, stabilizers, and other instruments which measure or correct any deviation of the supporting body from the reference axis of the gyroscope.