JPS5927216A - Gyrocompass - Google Patents

Abstract

PURPOSE:To heat a conductive liquid efficiently without impeding smooth following for an inner sphere, by providing a pair of heater electrodes, which are contacted with the conductive liquid, on the inner wall of an outer sphere, and providing a frequency divider in an output system of slave electrodes. CONSTITUTION:An upper electrode 7 and a lower electrode 8, which are contacted with a conducting liquid, on an outer sphere 1 and connected to a power source 9. Slave electrodes 10 and 11 are provided at positions facing a strip electrode 6 in an inner sphere 3. In adition to those electrodes, e.g., annular heating electrodes 12 and 13 are provided in the present invention and connected to a heater power source 14. Bridge resistors r3 and r4 are connected between the slave electrodes 10 and 11 of the outer sphere 1. The outputs of the slave electrodes 10 and 11 are inputted to a differential amplifier 15 and the differential output is supplied to a selecting device 16. In this constitution, the conducting liquid can be efficiently heated without impeding smooth following for the internal sphere.

Description

[Detailed Description of the Invention] In a gyro compass in which a gyro ball is floated in liquid, the buoyancy of the gyro ball fluctuates due to changes in specific gravity due to temperature fluctuations in the liquid, which greatly affects north pointing accuracy. For this reason, conventionally the liquid is heated to about 50°C. The conventional heating method was to heat the gyro outer sphere, which supports the gyro sphere, from outside using a heater. However, in this method, the heating efficiency is extremely low, and the power consumption of the gyro device power supply is extremely low, which is a major obstacle to miniaturization of the device, cost reduction, and simplification of the circuit.

The present invention relates to an improvement of this heating method, and utilizes the resistance that the conductive liquid itself has.

This will be explained below using examples.

In FIG. 1, 1 is a well-known gyro outer sphere (hereinafter referred to as outer sphere) supported by a gimbal device (not shown). 2 is a conductive liquid placed inside the outer sphere. 3
is a gyro inner ball (hereinafter referred to as inner ball) suspended in a conductive liquid, and a high-speed rotating wheel is housed inside. The inner sphere is provided with an upper electrode 4 and a lower electrode 5 at the upper and lower parts, and a semicircular charged electrode 6 is provided at the equator, and this structure is well known. An upper electrode 7 and a lower electrode 8 are provided on the outer sphere 1 in contact with a conductive liquid, and are connected to a power source 9. Further, a follower electrode 10.11 is provided on the inner sphere 3 at a position facing the charging electrode 6.

Ru. This structure is also well known.

In the present invention, in addition to these electrodes, for example, a ring-shaped heating electrode 1
2.13 is provided and connected to the heating power source 14. The frequency of the heating power source is lower than that of the wheel power source to prevent disturbance to the wheel rotation speed. In other words, the liquid resistance between the heater power supply electrode and the inner bulb upper and lower electrodes is R.
6. Set R16 and set the impedance of the gyro motor to Z.
Let it be L. Also, the liquid resistance between the upper and lower electrodes of the outer and inner spheres is R□
, R9, and the signal source impedance of the gyro motor power source is Zg.

In order for the heater power supply to not cause disturbance to the gyro motor, the gyro motor impedance is equal to the actance, so using this property, CZL<<R5+几.

By using a heater power supply frequency that satisfies the following, it is possible to prevent disturbances from being applied to the morph of the heater power supply.

In the above device, the rolling wheels of the inner sphere β are the power supply 9 - the outer sphere upper electrode 7 - the conductive liquid resistance mechanism, the inner sphere upper electrode 4 - the inner sphere lower electrode 5 - the conductive liquid resistance ratio, the outer sphere lower electrode 8 - The spot power is supplied by the route of the power supply 9.

The conductive liquid 2 is heated by a heating power source 14 - a heating electrode 12
- Conductive liquid resistor Maichi Heating electrode 13 - Power supply 14 route, but since it is directly performed by the electrothermal action of the conductive liquid resistor FL11, the heat conversion efficiency from the heating element to the heat receiving element is 100 cm. This can be improved by more than three times compared to the conventional 20 to 40 inches.

However, a drawback of this device is that it impedes the ability of the outer sphere 1 to follow the inner sphere 3, but the present invention prevents this as follows.

In FIG. 2, parts with the same symbols as in FIG. 1 have the same functions.

There is a bridge resistor r8 between the tracking electrodes 10 and 11 of the outer sphere 1.
and r4 are connected, and a power source 9 is inserted between the connection point and the outer sphere lower electrode. The tracking electrodes 10.11 are input to a differential amplifier 15 whose differential output is fed to a high frequency selector 16. The output of the high frequency selector 16 is supplied to the servo motor 18 via the servo amplifier 17, and the output is used to control the outer sphere 1.
It is connected to a compass card 19 which is integrally connected to the compass card 19.

In the above device, if the inner sphere 3 is held at the center position in the pointing north state, the bridge circuit composed of the resistors rl, rSs rB, r4 is in a balanced state, so the differential amplifier 15 The output of is zero, but if the outer sphere 1 rotates due to the turning of the ship, etc. and the resistances r and r differ, the bridge circuit becomes unbalanced and a difference signal is output from the differential amplifier 15. . Therefore, the servo amplifier 17 is energized and drives the servo motor 18 to drive the compass card and hence the outer sphere 1.
Rotate to follow the inner ball. However, when the heating electrodes 12 and 13 are activated as shown in FIG. 1, the power supply 14 applies normal noise disturbance to the bridge circuit through the liquid, and the follow-up circuit does not operate normally. That is, the heating power source 14
C exists as a form in which a servo signal is superimposed on a disturbance signal caused by
do.

In contrast, in the present invention, the high frequency selector 16 is inserted between the differential amplifier 15 and the servo amplifier 17, so that only the servo control signal in the high frequency region can be extracted.

As explained above, according to the present invention, it is possible to obtain the advantage of being able to efficiently heat the four-electrode liquid without impeding the smooth following action on the inner sphere.

[Brief explanation of the drawing]

Fig. 1 is a system diagram for explaining the heating device of the present invention, and Fig. 2 is a system diagram for explaining the follow-up device of the present invention. Liquid 3...Inner bulb 6...Charging electrode 10.11...Following electrode 12.13...Heating electrode 19...Compass card

Claims (1)

[Claims] In a gyro compass in which the inner bulb is housed in a conductive liquid inside the outer bulb, a pair of heater electrodes in contact with the conductive liquid are provided on the inner wall of the outer bulb, and these electrodes are connected to a power source for the gyro motor in the inner bulb. The frequency components of the heater power source leaking from the heater electrode system are connected to the output ends of the heater power sources having different frequencies, and the frequency components of the heater power source leaked from the heater electrode system are added to the output path of the inner sphere tracking electrode provided on the outer sphere. 1. A gyro compass characterized in that a frequency separator is provided for removing a signal having a frequency separator, and the servo motor for tracking the outer sphere is driven by the output of the frequency separator. C