JPS622487Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a predetermined angle detector based on a synchro electric machine signal, and is particularly intended to provide a predetermined angle detector that is not affected by fluctuations in the power supply voltage for the synchro electric machine.

For example, a gun battery mounted on a ship is controlled so as to remain level at all times without being affected by rolling, pitching, etc. of the ship. However, there is a limit to its control range due to its mechanical structure, and when the ship tilts beyond that limit, the control is stopped and the turret's attitude is prevented from changing any further to protect the support mechanism. ing.

In such cases, a stabilized gyro compass is attached to the gun turret, and attitude control of the gun turret is limited by the attitude detection signal from this compass.

FIG. 1 shows a conventional predetermined angle detector. 1 in the diagram
indicates a compass. The compass 1 is usually provided with a synchro transmitter, and the output of the synchro transmitter is supplied to a predetermined angle detector 2. Conventionally, one of the three-phase outputs obtained from the stator winding of a synchro oscillator
The phase output, that is, the output signal between output terminals S ₁ - _{S 3} is supplied to the detector 2, the magnitude relationship of this one phase signal is compared with the set value, and when the signal exceeds the set value, the relay is activated. It is configured to operate and obtain contact output.

That is, the signal between the terminals S ₁ -S ₃ is insulated by the transformer 3 and converted into direct current by the rectifier and smoothing circuit 4. The output of the rectifying and smoothing circuit 4 is zero when the rotor shaft of the synchro electric machine is in the initial position, that is, the pitch angle or roll angle is 0°, and increases or decreases in a relationship of sin θ with respect to the rotation angle θ of the rotor shaft. The DC output of the rectifying and smoothing circuit 4 is compared with the reference voltage set in the setting device 6 by the comparator 5, and when the value exceeds the reference value, it is determined that the pitch angle or roll angle θ has exceeded the limit value. The configuration is such that, for example, an H logic signal is supplied to the drive circuit 7, the relay 8 is energized, the relay contact 9 is turned on, a contact output is output from the output terminal 10, and the attitude control of the gun turret, etc. is stopped by this contact output. be done.

In the past, the limit angle was defined only by the magnitude relationship of the signal for one phase of the synchro electric machine, so if the voltage of the excitation power supply to the synchro electric machine fluctuated, it would be directly affected and the detection error of the limit value would be large. There are drawbacks that arise. In addition, the rectifier smoothing circuit 4
The DC voltage output from is proportional to |sinθ|. Therefore, near the zero point, it is possible to obtain a voltage that changes almost linearly with respect to the angle θ, but when θ exceeds 20°, the linearity deteriorates. In particular, when the angle exceeds 80°, the change in voltage with respect to the angle θ becomes small, resulting in poor accuracy. Note that the angle θ here refers to the rotation angle of the rotor shaft of the synchro electric machine. The rotor shaft rotates at an angle of, for example, several times to several tens of times per 1 degree of the pitch angle or roll angle of the ship. Therefore, as the pitch or roll angle increases, the measurement accuracy decreases, and there is a drawback that the limit angle cannot be accurately detected.

The object of this invention is to provide a predetermined angle detector using a synchro electric machine that is not affected by fluctuations in the power supply voltage for the synchro electric machine and can detect a limit angle as the measurement angle increases.

In this invention, the signal indicating the angle θ output from the synchro electric machine is converted into sinθ using a Scott transformer.
In addition to converting into voltages proportional to cos θ, the voltages proportional to sin θ and cos θ are rectified and smoothed, and at least one of them is divided so that the DC output voltages are equal to each other at a predetermined angle θ. The comparator compares the voltage with the other voltage, and when both voltages become equal, it is detected that a predetermined angle θ has been reached.

An embodiment of this invention will be explained in detail below using FIG. 2.

In FIG. 2, numeral ₁ indicates _a compass, which is equipped with a synchro transmitter as in _FIG . A signal of 2π/3) sinωt is output. These signals are converted into cosθsinωt and sin
It is converted into a signal of θsinωt. These signals are rectified and smoothed by rectifying and smoothing circuits 4a and 4b, and a DC voltage that changes in proportion to |cosθ| and |sinθ| is obtained on the output side. When this DC voltage is supplied to the comparator 5 at a ratio of 1:1, as can be seen from FIG. 3, both voltages match when the synchro electric machine transmits an angle of 45 degrees. Therefore, Synchro Denki is 45
If it is set as the limit value when the signal is transmitted, the outputs of the rectifying and smoothing circuits 4a and 4b may be supplied to the comparator 5 as they are. However, in reality, Synchro Denki's
Since it is not always the case that the angle of 45° is the limit value, in this invention, a voltage dividing circuit is provided at least on one side between the rectifying and smoothing circuits 4a, 4b and the comparator 5.
Either one of the DC voltages is divided and the levels of both signals are set to match at a predetermined angle θ. The example shown in the figure shows a case where voltage dividing circuits 6a and 6b are provided for both rectifying and smoothing circuits 4a and 4b and comparator 5. In this way, voltage dividing circuits 6a and 6b are connected to both sides.
If , for example, the voltage dividing ratio of the voltage dividing circuit 6a is reduced to 1/2.
By setting the voltage dividing ratio of the voltage dividing circuit 6b to 1/1, the comparator 5 is given a DC voltage that varies according to the relationship between curves _A2 and _B1 shown in FIG. Therefore, curves A ₂ and B ₁ coincide at an angle θ ₁ smaller than 45°,
At this matching angle, an H logic signal can be output to the drive circuit 7, energizing the relay 8 and output terminal 1.
Contact outputs can be output from 0a, 10b, and 10c.

On the other hand, if the voltage dividing ratio of the voltage dividing circuit 6a is 1/1 and the voltage dividing ratio of the voltage dividing circuit 6b is 1/2, the comparator 5 receives a voltage that changes according to the relationship between curves _A1 and _B2 shown in FIG. It is supplied to the container 5. Therefore, the curves A ₁ and B ₂ coincide at an angle θ ₂ greater than 45°, and when this angle θ ₂ is reached, the relay 8 can be energized to produce a contact output.

Therefore, by appropriately setting the voltage dividing ratio of the voltage dividing circuits 6a and 6b, it is possible to set both voltages to match at any angle within the range of 0° to 90° transmitted by the synchro transmitter. can.

A specific example is shown in FIG. In this example, an attenuator 11 is provided on the input side of the Scott transformer 3', and the output of the synchro oscillator is adjusted to an appropriate level and supplied to the Scott transformer 3'. Further, the rectifying and smoothing circuits 4a and 4b each use two operational amplifiers to form a double-wave rectifying circuit and a smoothing circuit. Voltage dividing circuit 6a,
In this example, 6b has a variable partial pressure ratio, and 6b
indicates the case where the partial pressure ratio is fixed. Voltage dividing circuit 6a
The voltage dividing ratio of the voltage dividing circuit 6b can be changed, for example, from 1/1 to 1/10, and the voltage dividing ratio of the voltage dividing circuit 6b can be changed, for example, from 1/1 to 1/10.
By setting it to 1/3, |cosθ| and |sinθ|
It can be set to match two voltages that vary in proportion to . The comparator 5 can be constituted by an operational amplifier, and applies a DC voltage proportional to |cosθ| to the inverting input terminal side of the operational amplifier, and a DC voltage proportional to |sinθ| to the non-inverting input terminal side of the operational amplifier. . Therefore, from 0° until both voltages match, the output of the comparator 5 is held at a negative polarity voltage, and both voltages match |sinθ|
When the voltage proportional to increases slightly, comparator 5
outputs a positive polarity voltage, that is, H logic, the transistor forming the drive circuit 7 is turned on, and the relay 8 is energized. In this example, a light emitting element 12 is connected in parallel with the relay 8, and when the relay 8 is energized, the light emitting element 12 emits light to indicate, for example, that the ship is heeling beyond a critical angle. .

As explained above, according to this invention, the limit angle is determined by detecting the coincidence of two voltages that change in proportion to the angle θ, so even if the excitation voltage for the synchro electric machine fluctuates, the two voltages will not change. Since both of them fluctuate in both directions, the limit setting angle does not shift even if the excitation voltage fluctuates, and the limit angle can be accurately defined. However, both |cosθ| and |
Since we compare the voltages that change in proportion to sinθ|, the two voltage change curves are shown in Figure 3 A ₁ , A ₂ and
As shown in B ₁ and B ₂ , since the intersections intersect at angles close to mutually orthogonal relationships over a wide range of 0° to 90°, highly accurate coincidence can be detected.

Although the case where the control limit angle of a gun battery mounted on a ship is detected has been described above, it is easy to understand that the use is not limited to this particular example.

[Brief explanation of the drawing]

Fig. 1 is a system diagram for explaining a conventional predetermined angle detector, Fig. 2 is a system diagram showing an embodiment of this invention, and Fig. 3 is a graph for explaining its operation.
FIG. 4 is a connection diagram showing a specific embodiment of this invention. 1...Compass, 2...Predetermined angle detector, 3'
... Scotto transformer, 4a, 4b ... Rectifier and smoothing circuit, 6a, 6b ... Voltage dividing circuit, 5 ... Comparator,
7...Drive circuit, 8...Relay.

Claims (1)

[Scope of utility model registration request] A Scotto transformer converts a signal indicating the angle θ from the stator winding of the synchro electric machine into a voltage proportional to sin θ and cos θ, and at least one of the voltages proportional to sin θ and cos θ becomes equal at a predetermined angle θ. A predetermined angle detector using a synchro electric signal, comprising means for dividing the voltage, and a comparator for comparing these with each other.