JPS6325919Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a device that rotates synchronously with a specific angular position of a first axis and a specific angular position of a second axis being made equal, for example, the pointing direction of an antenna beam of a radar and a CRT.
The present invention relates to a synchronous rotation device that can match zero degrees when synchronously rotating the designated angles of bright lines on an image plane. Conventionally, when using a synchronous generator on the first shaft side and a synchronous motor on the second shaft side to synchronize the rotation angles of both shafts and rotate them synchronously, the synchronous motor is
It was stopped by a zero degree signal from the first axis, and started by a zero degree signal from the first axis. However, to stop a synchronous motor, DC voltage is applied to the two phases between the three-phase lines to stop the motor, but the stopping position is uncertain, so to stop the motor at zero, the stopping position is determined only by the position where the zero temperature signal appears. Although necessary, the starting position of the synchronous motor is also determined by the phase of the synchronous generator. Therefore, unless the position where the zero degree signal from the second axis is output, the angular position of the synchronous phase of the synchronous motor, and the position where the zero degree signal is output from the first axis are accurately adjusted, the zero degrees of both axes will match during synchronous rotation. The problem was that I couldn't do it. In order to solve these disadvantages, the present invention eliminates the conventional synchronous generator and synchronous motor, and installs a device on the first shaft side that generates various signals of advance angle, delay angle, and zero degree. A step motor and a device that generates a zero signal are installed on the second shaft side, and the stop and start positions of the step motor are set at a specific point, and the stop and start positions of the step motor are determined by the zero signal from the second and first shaft sides, respectively. An object of the present invention is to provide a synchronous rotation device that can be started at any time. Next, embodiments will be described based on the drawings. 1st
The figure is a block diagram of a conventional synchronous rotation device using a synchronous generator and a synchronous motor. In Figure 1, the first
The shaft 1 is driven and rotated by a drive motor 4 through gear coupling. Further, the synchronous generator 3 is rotated by the first shaft 1 through gear coupling and generates an output voltage to the three-phase power transmission line. This output voltage is amplified by an amplifier 9 and supplied to a synchronous motor 11 via a relay drive switch 8 . The synchronous motor 11 drives and rotates the second shaft 2 through gear coupling. The first switch 5 drives the flip-flop gate 6, turns off the relay drive switch 8, connects the three-phase power transmission line, and starts the synchronous motor 1. The second switch 7 drives the flip-flop gate 6 and turns on the relay drive switch 8 to disconnect the three-phase power line and connect it to the DC power supply 10, which connects the synchronous motor 11.
stop. Once the first shaft 1 and the second shaft 2 are rotating synchronously with each other at the same zero degree, stopping and starting are easily performed by the second switch 7 and the first switch 5, but what does this mean? If the zero degree positions of the first shaft 1 and the second shaft 2 move during the stop due to this, the synchronous generator 3 and synchronous motor 1
The angular positions of the rotor shafts 1 and 11 are fixed at the zero degree position of the first shaft 1 and the second shaft 2, respectively, and the angular position of the stator of the synchronous motor 11 is moved little by little and the starting operation is repeated. However, the troublesome work of matching the phase angle to the phase angle position of synchronous rotation is required. When stopped, the zero degree position of both shafts often shifts due to the inertia of the loads on the first shaft 1 and the second shaft 2, and this has been a major drawback of conventional devices. FIG. 2 is a block diagram showing an embodiment of the synchronous rotation device according to the present invention, and FIG. 3 is a time chart of important signals in FIG. In FIG. 2, the first shaft 1 is driven and rotated by a drive motor 4 through gear coupling. Further, the angle signal generator 21 is rotated by the first shaft 1 through gear coupling, and generates two-phase angle signals having a lead and a lag relationship with each other. This angle signal is shown in A and B of FIG. The first zero degree signal generator 23 detects the zero degree of the rotation angle of the first shaft 1 and generates a zero degree signal by the first switch 22 . This zero degree signal is shown in FIG. 3C. For example, a photocell is used to detect the angle and zero degree, and a shaft encoder is used for the angle signal and zero degree signal. The second shaft 2 is driven and rotated by a step motor 24 through a gear connection. The second zero degree signal generator 25 detects the zero degree of the rotation angle of the second shaft 2 and generates a zero degree signal by the second switch 20. This zero degree signal is shown in FIG. 3E. For example, a photo cell is used to detect this zero temperature. Step motor 2
4, the zero degree signal E of the second zero degree signal generator 25 and the angle signals A and B of the angle signal generator 21 are stopped at a specific point shown on the time axis, and the zero degree signal of the first zero degree signal generator 23 is stopped. The angle signals A and B are driven by the drive circuit 26 so as to start at the specific point indicated on the time axis. Next, the drive circuit 26 inputs the first zero degree signal C and the two-phase angle signals A and B to an FF (flip-flop) gate 29 consisting of two NAND gates, and outputs an output signal D to the terminal of the FF gate 29S. NAND gate 27 which is output NAND gate A and FF gate 29
NAND gates B and B receive the output signal G of the Q terminal of NAND gates 30 and 31 which are C and NAND gates 30 and 31
An amplifier which branches the output signals Chi and Li into two, inputs one of them through NOT gates 32 and 33 in a mutually opposite phase relationship, amplifies it, and outputs it to the drive coil of the step motor 24. 34 and 35, amplifiers 36 and 37, and NOT gates 32 and 3
3, input another two-phase angle signals Nu and Ru that are in phase with the angle signals A and B, respectively, input the second zero degree signal E, and output the output signal to the R terminal of the FF gate 29. NAND which is NAND gate D
It consists of a gate 28. The two-phase angle signals A and B are outputted from the angle signal generator 21 by being branched into two branches, and one of them is input to the NAND gate 27. The other one is input to NAND gates 30 and 31, respectively. The output signal H of the NAND gate 30 is branched into two branches, one becomes the input signal W of the drive coil of the step motor 24 via the amplifier 35, and the other one is input to the NOT gate 32 to provide the output signal N. The signal is outputted and branched into two, one becoming the input signal for the drive coil via the amplifier 34, and the other being input to the NAND gate 28. Further, the output signal of the NAND gate 31 is branched into two branches, one of which becomes the input signal of the drive coil of the step motor 24 via the amplifier 36, and the other one is the input signal of the NOT gate 33.
The input signal is inputted to the output signal line 1 and outputted as an output signal, which is branched into two, one of which becomes the input signal of the drive coil via the amplifier 37, and the other input to the NAND gate 28. Next, the operation will be explained. FIG. 3a is a signal timing chart of key points when the first shaft 1 and the second shaft 2 are rotating synchronously. first switch 22
and the second switch 20 are both OFF, so the zero degree signal C and the zero degree signal H are both "0" signals,
Both the output signal D and the output signal H at the S terminal and the R terminal of the FF gate 29 are "1" signals, and the Q terminal maintains the previous state, that is, the activation state "1" signal. Therefore, angle signal A produces output signal Q, and angle signal B produces output signal R. Furthermore, the input signals of the drive coil of the step motor 24 are
A force and a force are generated, and the step motor 24 is driven to rotate. Points a, b, c, and d shown in FIG. 3a indicate the timing of the signals input to the step motor 24, and are specific points on the time axis that are in the mutual relationship of the input signals O, W, F, and Y. It is. In FIG. 3b, the first switch 22 is OFF, the second switch 20 is turned ON, and the second zero-degree signal generator 25 is turned on.
This is a timing chart of important signals when the rotation angle of the second shaft 2 is detected to generate a zero degree signal E, and the synchronous rotation is stopped.
When the zero degree signal H is input to the NAND gate 28, the output signal H changes from signal H-1 to signal H-0.
It becomes a “0” signal. The S terminal of the FF gate 29 is "1" and the R terminal is "0", which is the reset state, and the Q
The output signal of the terminal changes from signal T-0 to signal T-1 and becomes "0". Therefore, the output signals Chi and Li of NANDs 30 and 31 are the same as the signals Chi-1 and Li.
Changes from 1 to signal Chi-0 and Lee-0, becoming "1",
A DC voltage is applied to the drive coil input signals O and Y, and the step motor 24 stops rotating. The angular position at which this rotation is stopped is point b, which is a specific point of the two-phase angular signal. In FIG. 3C, the step motor 24 is stopped at a specific point b, the second switch 20 is in the OFF state, and the first switch 22 is in the OFF state.
is turned ON, the first zero degree signal generator 23 operates, detects the zero degree of the rotation angle of the first shaft 1, and generates the zero degree signal C to start synchronous rotation. It's a chat. When the zero degree signal C is input to the NAND gate 27, the output signal D changes from the signal Knee-1 to the signal Knee-0, and becomes a "0" signal. The S terminal of the FF gate 29 is set to "0" and the R terminal is set to "1", and the output signal of the Q terminal changes from signal T-1 to signal T-0 and becomes "1". Therefore, the output signals Chi and Li from the NANDs 30 and 31 are angle signals with exactly the same pattern as the angle signals A and B, such as signal Chi-2 and signal Lee-2, and the step motor is output at the specific point b. 24
resumes synchronous rotation. That is, for example, the synchronous rotation starts at point b, which is a specific point of the two-phase angle signal. In this way, when stopped, the zero degree position of the second shaft 2 coincides with, for example, point b on the time axis of the two-phase voltage of the step motor 24, and the zero degree position of the first axis 1 coincides with this point when starting. do. Therefore, the zero degrees of both axes can be precisely matched. Even if the period of the zero temperature signal is slightly different, if it is between point a and the next point a, the second switch 20 and the first switch 22 will always stop and start the synchronous rotation that corresponds to zero at any time. can be performed continuously. Furthermore, when the synchronous rotation is stopped, even if the first axis 1 moves to zero or the second axis 2 moves to zero, the step motor 24 will always start at a specific point with a simple switch operation. The troublesome work required in the past is no longer necessary, the price is the same as conventional equipment, and its practical effects are enormous. Although all the gates of the drive circuit 26 are constructed of NAND gates, it goes without saying that the same operation can be performed even if the gates of the driving circuit 26 are constructed of NOR gates.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional synchronous rotation device, FIG. 2 is a block diagram showing an embodiment of the synchronous rotation device according to the present invention, and FIG. 3 is a timing chart of important signals in FIG. 1...First axis, 2...Second axis, 3...Synchronous generator, 4...Drive motor, 5 and 22...First switch, 6 and 29...FF gate, 7 and 20 …
...Second switch, 8...Relay drive changeover, 9
and 34 and 35 and 36 and 37...multiplier, 10...
DC power supply, 11...Synchronous motor, 21...Angle signal generator, 23...First zero degree signal generator, 24
... Step motor, 25 ... Second zero-degree signal generator, 26 ... Drive circuit, 27, 28, 30 and 3
1...NAND gate, 29...FF gate, 32
and 33...NOT gate.

Claims (1)

[Scope of utility model registration request] In a device in which a first shaft and a second shaft rotate synchronously, a drive motor that drives the first shaft by a gear coupling, and a drive motor that drives the first shaft by a gear coupling, and a drive motor that rotates the first shaft and another gear coupling, and have a mutual lead and lag relationship. an angle signal generator that generates a two-phase angle signal, and a first zero degree signal generator that detects the zero degree of the rotation angle of the first shaft by operating a switch and generates a first zero degree signal. A step motor is provided on the first shaft side and drives the second shaft by another gear combination, and a step motor is provided on the first shaft side and drives the second shaft by another gear connection, and a second shaft motor detects the zero degree of the rotation angle of the second shaft by operating another switch and generates a second zero degree signal. A second zero degree signal generator is provided on the second axis side, and an FF (flip-flop) gate consisting of two NAND gates, the first zero degree signal and the above two-phase angle signal are input, and the output signal is output from this.
NAND gate A outputs to S terminal of FF gate
and NAND gates B and C which respectively input the output signal of the Q terminal of the FF gate and the two-phase angle signal and branch the output signal into two and output it to the amplifier; The amplifier divides the output signals into two, inputs one of them through a NOT gate in a mutually opposite phase relationship, amplifies the output signal, and outputs it to the drive coil of the step motor, and from each of the NOT gates. Input another two-phase angle signal that is the same phase as the above two-phase angle signal,
Furthermore, input the second zero degree signal and change the output signal to the above.
A synchronous rotation device in which a drive circuit consisting of a NAND gate D that outputs to the R terminal of the FF gate is connected between the first axis and the second axis.