Gyroscopes are widely used in aviation, aerospace and navigation fields.

When the gyro rotor rotates at a high speed, when no external torque acts on the gyro, the direction of the gyro self-rotating shaft remains stable in the inertial space, that is, it points to a fixed direction; While resisting any force that changes the axial direction of the rotor. This physical phenomenon is called axis stability or stability of gyroscope. Its stability varies with the following physical quantities: 1, the greater the moment of inertia of the rotor, the better the stability; 2. The greater the rotor angular velocity, the better the stability.