JPH0353358Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on the specific angular position of the first rotating body and the second rotating body.
A device that rotates synchronously by equalizing the specific angular position of the rotating body, such as the antenna and indicator of a small radar.
This invention relates to a device that synchronizes the rotational positions of the deflection coils of a CRT and rotates them synchronously. Conventionally, as this type of rotation synchronizing device, there is one shown in FIG. 1, for example. In Figure 1,
An antenna 1, which is a first rotating body, is rotationally driven by a drive motor 2. is the second rotating body
The deflection coil 7 of the CRT 6 is rotationally driven by a two-phase motor 10. The two-phase motor 10 is the antenna 1
It is rotationally driven by sending two-phase angle signals having a lead/lag relationship with each other from a two-phase generator 5 rotated by the amplifying circuit 12. However, in order to match the phases of the antenna 1 and the deflection coil 7 and rotate them synchronously, a two-phase motor 10 and a two-phase generator 5 are required.
A changeover switch 15 is provided between the rotating part of the antenna 1, a cam 3 on the rotating part of the antenna 1, and a micro switch 4 on its fixed part, and a cam 8 on the rotating part of the deflection coil 7 and a micro switch 9 on its fixed part. The phase signals output from the micro switches 4 and 9 are inputted to the antenna 1.
The detection circuit 11 detects the presence or absence of a phase difference between the angle signal and the deflection coil 7 and outputs a discrimination signal, and further switches a changeover switch 15 based on this discrimination signal to select one phase or two phases of the two-phase angle signal. It is necessary to include a relay 14 that functions to introduce the DC voltage from the DC power supply 13. When the antenna 1 and the deflection coil 7 rotate synchronously so that the microswitches 4 and 9 operate simultaneously, the phases match. This is because cams 3 and 6 indicate specific angular positions of antenna 1 and deflection coil 7, respectively. If microswitches 4 and 9 do not operate at the same time, there is a phase difference, and the detection circuit 11
Relay 14 is turned on by the discrimination signal output from
Therefore, the changeover switch 15 switches from the output end of the amplifier circuit 12 to the output end of the DC power supply 13, and one phase of the two-phase angle signal becomes a DC voltage, and the two-phase motor 10
is braked and stopped. When the antenna 1 continues to rotate and the micro switch 4 is activated, the phase difference disappears, the relay 14 is turned OFF by the output of the detection circuit 11, and the changeover switch 15 is turned OFF.
is switched from the output end of the DC power supply 13 to the output end of the amplifier circuit 12, and when the two-phase angle signal is input to the two-phase motor 10, the braking is released, the two-phase motor 10 starts rotating, and the antenna 1 It rotates synchronously with the deflection coil 7 in phase. However, in such a conventional rotation synchronizer, in order to bring the stopped device into synchronized rotation with the same phase, the antenna 1 and the deflection coil 7 are placed in a position where the micro switches 4 and 9 are activated simultaneously. Furthermore, the mutual positional relationship between the rotor and stator of the two-phase motor 10 needs to be accurate with respect to the two-phase angle signal transmitted from the two-phase generator 5. In addition, the antenna 1 may rotate due to external forces such as wind while stopped, and when the two-phase motor 10 is rotating synchronously and the phases are matched as described above, the timing of braking and stopping is insufficient and necessary. However, since it is not in a position where it can be restarted, there is a problem in that the rotor of the two-phase motor 10 must be moved little by little to find the starting position, which is a troublesome task. Furthermore, since the two-phase motor 10 has a small torque at startup, it also has the disadvantage that errors tend to occur in synchronous rotation. The present invention was developed by focusing on these conventional problems, and uses a pulse motor with a large starting torque as a motor to rotationally drive the deflection coil of the CRT, which is the second rotating body. Equipped with an azimuth detector that generates an azimuth pulse signal consisting of a pulse train synchronized with the rotation of the antenna, which is the body, and generates multiple sequences of angle signals whose phase shifts sequentially for each azimuth pulse signal, and detects the phase difference. It is an object of the present invention to eliminate the above-mentioned drawbacks by using a shift register that controls the generation and disappearance of the angle signal based on a signal, and by driving a pulse motor using this angle signal. The rotation synchronizer of the present invention includes: a drive motor that is a means for driving a first rotating body; an azimuth detector that is a means for generating an azimuth pulse signal consisting of a pulse train synchronized with the rotating body of the first rotating body; a starting signal transmitter that is a means for generating a starting signal indicating starting of the first rotating body; and an antenna direction detector that is a means for generating a first phase signal indicating a specific angular position of the first rotating body. , a deflection coil direction detector which is a means for generating a second phase signal indicating a specific angular position of the second rotating body; and a detection circuit which is a means for outputting a discrimination signal for detecting the presence or absence of a phase difference between the first and second rotary bodies, and a detection circuit which generates a plurality of rows of angle signals whose phase is successively shifted for each of the azimuth pulse signals, A shift register is a means for controlling the generation and disappearance of the angle signal, an amplification circuit is an amplification means for amplifying the power of the angle signal, and the output from the amplification circuit drives the second rotating body. It consists of a pulse motor as a means. Therefore, when the antenna of the first rotating body is started to rotate by the drive motor, the azimuth detector generates an azimuth pulse signal, the start signal transmitter sends a start signal, and the antenna direction detector starts the rotation of the first rotor. A phase signal is generated. The azimuth pulse signal is input to the shift register as a clock pulse. A shift register circulates binary data set in parallel for each azimuth pulse signal and outputs it with a phase shift, thereby generating multiple series of serial angle signals, that is, multiphase angle signals that are in a lead/lag relationship with each other. The angle signals are each amplified in power by an amplification circuit to rotate the pulse motor and rotate the deflection coil of the second rotating body. If there is a phase difference, the second phase signal generated by the deflection coil direction detector and the first phase signal and activation signal from the antenna direction detector are input to a detection circuit consisting of a logic circuit to detect the phase difference. The presence or absence is detected, and the result of the determination is input as a determination signal to the preset terminal of the shift register, and the phase shift operation is stopped or activated in priority to the clock pulse.
When there is a phase difference, the phase shift operation stops and the second
The rotating body stops. However, since the first rotating body is rotating, the first phase signal continues to move and matches the stationary second phase signal, and when the phase difference disappears, the discrimination signal starts the phase shifting operation of the shift register again. Start up and rotate the pulse motor. The angle signal that drives the pulse motor is generated by the azimuth pulse signal generated by starting the antenna, so it has no relation to the position of the antenna when it is stopped rotating.
As long as the mutual relationship between the rotor and stator of the pulse motor is adjusted, they will rotate synchronously and will always stop and start at specific angular positions, eliminating the cumbersomeness of conventional methods. The task of matching the phases is done completely automatically, and since the pulse motor has a large starting torque, it also has the advantage that no errors in synchronous rotation occur at the time of starting. Next, the present invention will be explained in detail based on the drawings. FIG. 2 is a block diagram showing an embodiment of the rotation synchronizer of the present invention. In FIG. 2, the same numbers are used for the same functions as those in FIG. 1, and lines indicating arrows between blocks indicate that signals indicated by lowercase letters are transferred in the direction of the arrow. The antenna 21 is an antenna of a radar device or the like and is rotationally driven by a drive motor 2 via a rotation system 37. Direction detector 25
is connected to a rotating system 37 and has a rotating disk with a large number of stripes in the azimuth direction of 360 degrees, and uses these stripes to detect light with a semiconductor element and generate a pulse train synchronized with the rotation of the antenna 21. An azimuth pulse signal c is generated and sent to the clock terminal of the shift register 32 . The power source 36 starts the drive motor 2 via the power switch 35, and at the same time operates the starting signal generator 34, which is a flip-flop or the like, and generates the starting signal b. The activation signal b is the detection circuit 3
Sent to 1. A thin line 2 in one direction on the surface of the rotating system 37, indicated as a specific angular position of the antenna 21.
3 is provided, and an antenna direction detector 24 is provided that performs light detection by a semiconductor element using this wire 23, and generates a first phase signal f as a signal of "0" and "1", and a detection circuit Send to 31 . Similarly, one direction on the surface of the rotating system 38 of the deflection coil 27, indicated as a specific angular position of the deflection coil 27, is
is provided, and a deflection coil direction detector 29 is provided which performs photodetection by a semiconductor element using this fiber 28, and generates a second phase signal e as a signal of "0" and "1", and detects it. It is sent to circuit 31 . Detection circuit 31
is composed of a logic element, and detects the presence or absence of a phase difference between the antenna 21 and the deflection coil 27, which are the first and second rotating bodies, by inputting the phase signals e and f and the starting signal b. A discrimination signal g consisting of a signal of 1'' is generated and sent to the preset terminal of the shift register 32 . The shift register 32 receives the azimuth pulse signal c and the discrimination signal g, generates multiple rows of angle signals d whose phase is sequentially shifted for each azimuth pulse signal c, and controls the generation or extinction of the angle signal d by the discrimination signal g. This is as already explained. The angle signal d rotates the pulse motor 30 via the amplification circuit 33 . The deflection coil 27 rotates at the thin base of the CRT 6 to perform PPI display of the electron beam on the image plane of the CRT 6. Next, FIG. 3 is a partial circuit diagram of the rotation synchronizing device of the present invention. The same numbers are used for the same functions as in FIG. 2. The shift register 32 consists of a shift register element 41 and NOT gates 42 and 43. The direction pulse signal c is sent to the shift register element 41
The phase signals e and f are input to the clock terminal clock of
is input to the AND gate 49, its output and the activation signal b are input to the OR gate 48, whose output is the discrimination signal g, and these form the detection circuit 31 .
The shift register 32 inputs a signal of "1" from the discrimination signal g when there is a phase difference, and a signal of "0" when the phases match, to the preset terminal Mc. Also, for example _{, each terminal A IN ,}
Set input to B _IN , C _IN and D _IN . Also, a terminal to which the output signal of the shift register element 41 is sent.
Regarding C ₀ and D ₀ , the output signal from terminal C ₀ is 2
One branch is input to an amplifier 44 via a NOT gate 42, and the other is input to an amplifier 45. terminal
The output signal from D ₀ is branched into three branches, one is connected to the serial input terminal S _IN of the shift register element 41, and the other is input to the NOT gate 43 and the amplifier 46. Furthermore, the outputs of the NOT gates 42 and 43 are input to amplifiers 44 and 47, respectively.
5, 46 and 47 form an amplification circuit 33 , the output of which sends angle signals d ₁ , d ₂ , d ₃ and d ₄ to input terminals A, B, C and D of pulse motor 30 , respectively. The figure shows a circuit for driving the pulse motor 30 with four-phase angle signals, but driving with more multi-phase angle signals also increases the number of bits of parallel data and makes the pulse motor 30 multi-phase. This makes it extremely easy. Next, the operation of the above embodiment of the rotation synchronizer of the present invention will be explained with reference to the timing chart of each signal shown in FIG. Power switch 3
5 is closed, a voltage is applied to the drive motor 2 from the power source 36 to drive the drive motor 2, and at the same time the start signal generation circuit 34
is input to generate an activation signal b indicated by "1". Of course, voltage is also supplied to the detection circuit 31, shift register 32 , amplification circuit 33 , azimuth detector 25, antenna direction detector 24, pulse motor 30 , and deflection coil direction detector 29. antenna 21
An azimuth pulse signal c consisting of a continuous pulse train is generated in accordance with the rotation of the azimuth. At the same time, it is indicated as “0”, and as it rotates, it moves on the time axis and appears.
A phase signal f is generated. At the output terminals _C0 and _D0 of the shift register element 41, the signals shifted for each azimuth pulse signal c are "0" and "1", and then "0".
and "0", "1" and "0", "1" and "1", and so on are output in succession. This produces an angle signal d ₂ of serial data of 0011... and an angle signal d ₃ of serial data of 1001.... Angle signal d ₂ is NOT gate 4
2 yields the angle signal d ₁ and similarly the angle signal d ₃ is
NOT gate 43 produces an angle signal _d4 . As shown in FIG. 4, the angle signals d ₁ , d ₂ , d ₃ and d ₄ form four columns of angle signals whose phase is successively shifted for each azimuth pulse signal c. These four-phase angle signals enter the stator windings of each phase via terminals A, B, C, and D of the pulse motor 30 , and drive the pulse motor 30 to rotate. Along with this rotation, a second phase signal e, which is indicated by "1" and appears to move on the time axis, is generated. Regarding the phase relationship between the antenna 21 and the deflection coil 27, when the discrimination signal g of the detection circuit 31 is "0", the shift register 32 performs a shift operation, and the signal g is "1".
Shift operation is stopped when . Therefore, the detection circuit 3
Regarding the input signal of 1, the activation signal b is always a “0” signal after activation, and both the phase signals e and f are “1”.
A shift operation is performed except when there is a signal. In FIG. 4, the stop 1 state is a state in which the activation signal b is a "1" signal and the orientation signal c is not yet generated. Eventually, the shift register 32 performs a shift operation, and the deflection coil 27 begins to rotate, but with a phase difference from the antenna 21. Next, when the second phase signal e appears and shows a "1" signal together with the first phase signal f at that time, the shift operation is stopped and the angle signals d ₁ , d ₂ , d ₃ and d ₄ become 0011. It becomes a parallel data state, and the pulse motor 30 and deflection coil 2
7 stops. This condition is indicated by Stop 2. Since the antenna 27 is rotating, the first phase signal f appears approaching the stationary second phase signal e, and both signals become "1" like "0" and "1". When the state is removed from "1", the shift operation starts and the rotation of the deflection coil 27 starts again.
Thereafter, the phase signals e and f appear together, so that the phase coincides with that of the antenna 21 and the synchronous rotation continues. As described above, according to the present invention, the pulse motor is rotated by regular and accurate angle signals applied to each phase, and is always stopped in the same state. This eliminates the conventional unstable situation that occurs with synchronous motors, where the positions of the rotor and stator are unstable when stopped, and since pulse motors have a large starting torque, there is little rotational error when starting. ,
Furthermore, the fact that the first rotating body and the second rotating body can be rotated synchronously with their respective phases matching each other very easily has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional rotation synchronizer, FIG. 2 is a block diagram showing an embodiment of the rotation synchronizer of the present invention, FIG. 3 is a partial circuit diagram of the rotation synchronizer of the present invention, and FIG. The figure is an explanatory diagram of the timing of the signals shown in lowercase letters in FIG. 3. 1 and 21... antenna, 2... drive motor, 3
and 8... cam, 4 and 9... micro switch, 5
...2-phase generator, 6...CRT, 7 and 27...deflection coil, 10...2-phase motor, 11 and 31 ...
Detection circuit, 12 and 33 ... Amplification circuit, 13... DC power supply, 14... Relay, 15... Changeover switch, 23 and 28... Thread, 24... Antenna direction detector, 25... Direction detection device, 29...deflection coil direction detector, 30 ...pulse motor, 32 ...
Shift register, 34...Start signal generator, 35
...Power switch, 36...Power supply, 37 and 38...
...Rotation system, 41...Shift register element, 42 and 43...NOT gate, 44, 45, 46 and 47
...Mixer, 48...OR gate, 49...AND
Gate.

Claims (1)

[Scope of utility model registration request] means for driving the first rotating body; means for generating an azimuth pulse signal consisting of a pulse train synchronized with the rotation of the first rotating body; and means for generating an activation signal indicating activation of the first rotating body; means for generating a first phase signal indicative of a specific angular position of the first rotating body; means for generating a second phase signal indicative of the specific angular position of the second rotating body; 1 and the second phase signal.
means for outputting a discrimination signal for detecting the presence or absence of a phase difference between the rotating bodies; generating a plurality of rows of angle signals whose phase is sequentially shifted for each of the azimuth pulse signals; and generating and extinguishing the angle signals by the discrimination signal; A rotation synchronizing device comprising a controlling means, an amplifying means for amplifying the power of the angle signal, and a means for driving a second rotating body by an output from the amplifying means.