RU77418U1 - DYNAMICALLY ADJUSTABLE GYROSCOPE - Google Patents

Abstract

Dynamically tuned gyroscope can be used in inertial control systems of moving objects. A dynamically tuned gyroscope contains a flywheel (1), mounted using mutually perpendicular jumpers (2) and (3) on a shaft (4), which rotates with a drive consisting of a stator (5), a rotor (6), a magnet (7) rotor position sensor. A coil (8) of the rotor position sensor is fixed on the gyroscope case, the signal from which enters the electronic unit (9) that controls the rotation of the drive. After dynamic tuning for each DNG, the dependence of the drift value on the angle between the vector of the rotating magnetic field of the drive and the elastic jumpers (2) and (3) is individually determined, the angle at which the first derivative of this function is close to zero in angle, and the electronic control unit ( 9) by rotation of the drive, at a signal from the rotor position sensor, ensures the constancy of the selected angle each time the DNG is turned on., 2 ill.

Description

The invention relates to gyroscopy and can be used in inertial control systems of moving objects.

It is known to construct a dynamically tuned gyro (DNG) electric drive according to the principle of a valve electric drive (RU patent, No. 2158902, G01C 19/02, 1999). The gyroscope contains a rotor in the form of a radially magnetized permanent magnet with ball bearings for suspension, a flywheel mounted on the shaft and connected to the drive shaft by means of a thinned shaft, a stator containing a motor winding.

As a result of constructing the DNG electric drive according to the principle of a valve electric drive, a constant torque on the motor shaft and a constant rotor speed are maintained, but the accuracy of the DNG remains low, because the angle between the rotor position sensor and the elastic jumpers of the DNG will be random, constant for each DNG.

A dynamically tuned gyroscope based on the “electric spring” circuit adopted as a prototype is known. DNG contains a synchronous motor, a flywheel connected to the motor shaft by mutually perpendicular elastic jumpers and an electronic engine rotation control unit (patent RU, No. 2101678, G01C 19/02, 1998 g.).

This design of DNG does not take into account a large change in the magnitude of the drift from start to start (a random component of the drift from start to start), due to the fact that at the time the motor reaches synchronism, the angle between the vector of the rotating magnetic field of the drive and the elastic jumpers is random.

The objective of the present invention is to improve the accuracy of DNG by reducing the random component of the drift from start to start.

This is achieved by the fact that in a DNG including a synchronous engine, a flywheel connected to the motor shaft by mutually perpendicular jumpers and an electronic drive rotation control unit, an additional rotor position sensor is introduced, consisting of a magnet mounted on the rotor of the drive and a coil mounted on the DNG housing.

The invention is illustrated by drawings.

Figure 1 shows the proposed DNG; figure 2 is a graph of the drift versus the angle between the vector of the rotating magnetic field of the drive and the elastic jumpers, where φ is the angle between the vector of the rotating magnetic field and the elastic jumpers, ω is the magnitude of the drift.

A dynamically tuned gyroscope contains a flywheel 1 (Fig. 1), mounted using mutually perpendicular jumpers 2 and 3 on a shaft 4, which rotates with a drive consisting of a stator 5, rotor 6, magnet 7 of the rotor position sensor. A coil 8 of the rotor position sensor is fixed on the gyroscope body, the signal from which enters the electronic unit 9, which controls the rotation of the drive.

DNG works as follows.

First, for each DNG, the dependence of the drift value on the angle between the vector of the rotating magnetic field of the drive and the elastic jumpers is determined. The angle φ _{0 is} chosen in which the first derivative of this function is close to zero in angle. The electronic unit 9 for controlling the rotation of the drive, upon a signal from the rotor position sensor, consisting of a magnet 7 and a coil 8, ensures the constancy of the selected angle each time the DNG is turned on.

The phase angle between the signal from the rotor position sensor and the voltage of one of the drive supply phases is taken as the angle φ between the vector of the rotating magnetic field of the drive and the elastic jumpers 2 and 3. The angle is constant at every turn on

block 9, which controls the rotation of the drive by changing the power settings.

The choice of the angle φ _{0 of} FIG. 2 at the point where the first derivative with respect to the angle is close to zero ensures a minimum change in the drift value from the inaccuracy of maintaining by the electronic unit 9 the angle between the vector of the rotating magnetic field of the drive and the elastic jumpers.

Claims (1)

A dynamically tuned gyroscope (DNG), including a synchronous motor, a flywheel connected to the motor shaft with mutually perpendicular elastic jumpers, and an electronic drive rotation control unit, characterized in that the rotor position sensor is additionally introduced into the device, consisting of a magnet mounted on the drive rotor and coils mounted on the DNG case.