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Ultra-low-cost North Finder to talk about vertical gyroscopes to make the aircraft more stable
- 2019-06-24-

The ultra-low-cost north finder vertical gyroscope is a two-degree-of-freedom gyroscope used to measure the yaw angle and roll angle of a missile body. When the gyroscope is mounted on the projectile, the rotor axis is perpendicular to the launching plane. Before the missile is launched, the rotor axis is corrected to a horizontal position, the outer frame axis is in the launching plane, and the gyro output is a yaw angle. Before the missile is launched, the inner frame axis coincides with the vertical line of the launching point. At this time, the inner frame axis coincides with the longitudinal axis of the missile. When the missile takes off vertically, the gyro outputs a signal proportional to the rolling angle.

The vertical gyroscope is also a high-performance, low-cost vertical gyro system based on MEMS devices for measuring the pitch, roll angle, 3-axis acceleration and 3-axis angular velocity information of the motion carrier. It can be widely used in UAV, aircraft guidance and control, attitude reference system, platform stability, robot, antenna stability, GPS combination, general aviation and other systems. It is very popular on modern aircraft. It can accurately measure the attitude angle of the aircraft and output an electrical signal proportional to the attitude angle, which is provided to the computer and finally displayed on the meter.

In order to measure and output the attitude signal of the aircraft, a pitch synchronizer and a tilt synchronizer are mounted on the vertical gyroscope, and the pitch angle and the tilt angle electrical signals are respectively output. In order to reduce the longitudinal acceleration error, the vertical gyroscope is equipped with a pitch upright and horizontal correction disconnection gate, which cuts off the pitch correction of the gyroscope when there is longitudinal acceleration; in order to reduce the hover error, the vertical gyroscope is installed with tilt upright and horizontal Correct the disconnection of the switch and cut off the tilt correction of the gyroscope when the tilt is tilted.

The vertical gyroscope is divided into upper and lower parts. The upper half contains the electromechanical equipment of the gyroscope, and the lower half contains all the system electronics. The basic components of the upper half are mainly composed of four parts: the gyro rotor, the gimbal, the angle sensor and the torque device.

(1) Gyro rotor: A synchronous motor, a hysteresis motor, a three-phase AC motor, a brushless DC motor, and the like are often used to rotate the gyro rotor around the rotation axis at a high speed, and the rotation speed thereof is approximately constant.

(2) Gimbal: The inner and outer frames of the gyroscope, or inner and outer rings, are structures that enable the gyro's rotation axis to obtain the required degree of rotational freedom, and are also mechanical structures that support the operation of the entire gyroscope.

(3) Angle sensor: used to measure the angle of rotation between the inner and outer rings of the gyroscope and the axis of the frame. This angle is the attitude angle of the measured aircraft. Typically, there are two sets of angle sensors in a gyro system, one mounted on a frame and one mounted on a corresponding support structure on the outer ring.

(4) Torque: It is used to provide correction torque compensation for the correction of the spindle position. In the gyro system, there are generally two sets of correction torque devices that are mounted on the frame and the outer ring support housing, respectively.

The gyroscope is an angular motion detecting device that utilizes a momentum moment sensitive housing of a high speed revolving body to rotate one or two axes orthogonal to the rotation axis with respect to the inertia space. An angular motion detecting device made by other principles also functions as a gyroscope.

The gyroscope can sense the rotational angular velocity of one or more axes, and can accurately detect complex moving motions in free space. Therefore, the gyroscope becomes a necessary motion sensor for tracking the moving direction and rotating motion of the object. Unlike accelerators and electronic compasses, gyroscopes do not have to rely on any external force such as gravity or magnetic fields to perform their functions autonomously. Therefore, in theory, only the gyroscope can complete the task of attitude navigation.

The characteristics of the gyroscope are high-frequency characteristics, which can measure high-speed rotary motion. The disadvantage is that there is a zero drift, which is susceptible to temperature/acceleration.