JPH0622148U - Circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] In a circuit breaker that raises and lowers the blocking rod with a DC brushless motor, enables rotation of the motor when there is a lock failure due to a missing phase of the motor, and immediately knows the lock and open phase rotation. To be able to. Also,
When the motor is locked when the cutoff rod lowering command is issued and the motor cannot be rotated even after a predetermined number of retries, the cutoff rod is quickly lowered by its own weight. [Structure] A lock of the DC brushless motor 1 is detected by an amplification / detection circuit 4 due to an abnormal increase in motor current, and a lock detection signal 4b is sent to a CPU 5. The CPU 5 determines the lock failure by the lock detection signal 4b, turns on / off the relay 7 via the relay driver 6, and shuts off and reconnects the motor control power supply. As a result, the motor drive current is temporarily cut off, the motor is brought into an unrestrained state, the motor slightly rotates due to the weight of the cutoff rod and deviates from the zero torque range, and the rotation is continued after reclosing, and the cutoff rod starts to move.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crossing barrier such as a railroad crossing barrier and a parking lot barrier, and more particularly to an emergency process when the motor is locked.

[0002]

[Prior art]

 Conventionally, in this type of circuit breaker, a DC brushless motor (sometimes referred to simply as a brushless motor) has been used to drive the blocking rod because of its large starting torque and maintenance-free performance.

[0003]

[Problems to be solved by the device]

 However, since this type of circuit breaker is installed outdoors, it may cause a failure such as an open phase due to a voltage drop. However, in a multi-phase drive brushless motor such as a three-phase full-wave system, even if one phase fails, the rotational force does not lose the rotational angle range. In addition, the angle range to be locked is only a small part of the 60 °, and the motor often rotates apparently normally. This is called open-phase rotation. If the motor is left in the open phase rotation mode, it may eventually become a motor lock depending on the starting position, which will hinder traffic.Therefore, it is necessary to avoid malfunction of the shutoff rod due to motor lock as much as possible. It is necessary to know lock and open-phase rotation promptly. The locking due to this phase loss is due to the fact that there is a range in which almost no rotational force is generated due to only the restraining force due to the excitation of the phase that is not phase lost.

The present invention has been made under such circumstances, and enables rotation of the DC brushless motor when the DC brushless motor has a lock failure due to an open phase or the like, and promptly operates when the rotation of the motor is disabled. An object of the present invention is to provide a circuit breaker in which the blocking rod is lowered by its own weight, and lock and open-phase rotation can be immediately known.

[0005]

[Means for Solving the Problems] As described above, since the angle range in which the DC brushless motor locks due to the open phase is small, if the motor drive current is shut off when locked, the motor rotates due to the weight of the shutoff rod. However, there is a high possibility that the motor will be able to be driven by reentering the motor drive current outside the above angle range. According to the present invention, based on this idea, in order to achieve the above-mentioned object, the circuit breaker is configured as in the following (1) to (4).

(1) A circuit breaker for raising and lowering a blocking rod by a DC brushless motor, the lock detecting means detecting lock of the DC brushless motor, and the DC brushless according to an output signal of the lock detecting means. A circuit breaker equipped with a cut-off / re-input means for cutting off and re-injecting the motor drive current.

(2) The circuit breaker according to (1), wherein the breaking / reclosing means cuts off and re-closes the control power of the DC brushless motor according to the output signal of the lock detecting means.

(3) In addition to the lock detecting means, an open-phase rotation detecting means for detecting open-phase rotation is provided, and a display means for performing a required display according to an output signal of these detecting means is provided. 1) Or the breaker as described in said (2).

(4) The shut-off / re-entry means suspends the re-entry when the lock rod descend command is issued and the lock is not released despite the interruption / re-entry of the motor drive current a predetermined number of times. The circuit breaker described in 1).

[0010]

[Action]

 With the configurations (1) to (4), when the DC brushless motor is locked, the drive current of the motor is shut off and turned on again. In the configuration of (3), the required display is performed according to the output signals of the lock detecting means and the open-phase rotation detecting means. With the configuration of (4), when the lock is not released despite the interruption and re-entry of the motor driving current for the predetermined number of times, the reentry is stopped and the dead weight of the interruption rod is started.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to embodiments. FIG. 1 is a block diagram of an electric system of a "railroad crossing breaker" which is an embodiment, and FIG. 2 is a circuit diagram of an ascending cam switch and a descending cam switch portion in the embodiment.

In FIG. 1, a DC 24 V power source is supplied to a relay 7 via a normally closed contact 23 a of a relay 23 (see FIG. 2) to a drive circuit (inverter circuit) of a DC brushless motor (hereinafter referred to as a motor) 1. To the control circuit of the motor 1 via the normally-closed contact 7a of the same, and to the current sensor 3 and the amplification / detection circuit 4 after being stabilized at 12V by the stabilizing circuit 9 and also at 5V by the CPU (central processing unit). ) 5 is supplied.

The lock and the open phase rotation of the motor are detected by the amplification / detection circuit 4 by taking out the voltage of the motor current detection resistor 2 connected in series with the motor power source by the current sensor 3. In other words, when locked, a larger motor current than normal will flow. Therefore, the gain / detection circuit 4 will detect this by comparing it with a value slightly higher than the upper limit of the motor current during normal operation, and the open phase rotation will occur. In this case, since the motor current periodically becomes zero, this is detected by the amplification / detection circuit 4 by comparing it with a value slightly smaller than the lower limit value of the motor current during normal rotation. The phase loss rotation detection signal 4a and the lock detection signal 4b from the amplification / detection circuit 4 are sent to the CPU 5, and the CPU 5 shuts off and reapplies the motor control power supply, which will be described later, and displays an alarm on the display 8.

The condition 8a for presence / absence of the motor drive power supply is transmitted to the CPU 5 by the photocoupler 8 driven by the voltage of the motor drive power supply, and the raising / lowering condition 10a of the cutoff rod (not shown) is driven by the raising / lowering command voltage. The information is transmitted to the CPU 5 by the photo coupler 10.

In FIG. 2, 21-1 is an ascending cam switch that is turned on when the shutoff rod reaches near the vertical position, and 21-2 is a descending cam switch that is turned on when the shutoff rod reaches near the horizontal position. , 22 are movable contacts which are closed to the ascending cam switch side under the ascending condition and to the descending cam switch side under the descending condition. Reference numeral 23 is a relay connected between the movable contact 22 and the DC power source OV end, and when the relay is energized, the breaking rod is brought into a braking state by a relay contact (not shown), and when the relay is not energized, the relay contact 23a. To turn on the motor drive power.

Next, the operation of the embodiment will be described with reference to a flowchart showing the operation of the CPU 5 of FIG. 3 and timing charts of the signals of the respective parts of FIGS.

In step 1 (shown as S1 below) of FIG. 3, the alarm output to the display 8 is initialized, and in step S2 the relay 7 is de-energized to turn on the motor control power supply. In S3, it is determined whether or not the motor drive power supply is turned on by a signal from the photocoupler 8. If not, the process returns to S2 and waits for the motor drive power supply to be turned on.

As is apparent from FIG. 2, when the up command is issued when the shutoff rod is near the horizontal position, or when the down command is issued when the shutoff rod is near the vertical position, the relay 23 is in the non-energized state. Then, the breaking of the shut-off rod is stopped, the contact 23a is closed, and the motor drive power is turned on.

When it is determined in S3 that the motor drive power source is turned on, it is determined in S4 whether or not there is a motor lock failure based on the presence or absence of the lock detection signal 4b. In the case of a lock failure, an alarm is displayed on the display 8 in S7 and the motor control power is cut off in S9 or S15 within one second after the up / down command.

In S8, the signal from the photocoupler 10 is referred to determine whether the lock-up failure or the lock-down failure occurs. If the lock-down failure occurs, the relay 7 is operated for 1 second via the relay driver 6 in S9. Energize to open the relay contact 7a and shut off the motor control power for 1 second. In step S10, the relay 7 is de-energized, the relay contact 7a is closed, and the motor control power is turned on again. In step S11, it is determined whether the motor lock is continued by the lock detection signal 4b.

When the relay contact 7a is opened due to the temporary energization of the relay 7 and the motor control power supply is cut off, the switching elements of the respective phases of the motor drive circuit are turned off and the motor is in the unrestrained (free) state. The motor rotates slightly due to the weight of the shutoff rod. For this reason, when locked by the phase loss, it goes out of the lock range, the lock is released by re-injection of the motor control power source in S10, the motor continues to rotate, and the shutoff rod begins to descend.

If the lock failure continues in S11, the relay 7 is energized via the relay driver 6 and the relay contact 7a is opened to turn on the motor control power within 1 second after the motor control power is turned on again. Shut off again. In S13, it is determined whether or not the motor drive power supply is turned on by the signal from the photocoupler 8, and if it is turned on, it is determined in S14 by the signal from the photocoupler 10 whether it is the rising condition. If it is not the rising condition, S13 Return to. After that, S13 and S14 are repeated, and if the motor drive power is shut off or an ascending command is issued and the ascending condition is met, the process returns to S2. That is, the motor drive current is cut off by the motor control power supply being cut off in S12, the motor is brought into an unrestrained state, the cutoff rod descends by its own weight to reach a horizontal position, the descending cam switch is turned on, and the relay 23 is energized. The motor control power continues to be shut off until the contact 23a opens and the motor drive power is shut off. Or, if for some reason the shutoff rod does not descend by its own weight, the motor control power supply will continue to be shut down until the rise command comes and the rise condition is met.

When the lock-up failure occurs in S8, the motor control power is shut off for 0.7 seconds in S15, the motor control power is turned on again in S16, and it is determined in S17 whether the lock failure continues. .

When the motor control power supply is cut off in S15 and the motor is in the unrestrained state, braking is already applied to the cutoff rod, so that the weight of the cutoff rod is lowered slightly from the horizontal position to rotate the motor. When locked in the open phase, it goes out of the lock range, the lock is released by re-injecting the motor control power supply in S16, the motor continues to rotate, and the shutoff rod starts to rise. When the lock failure is resolved in this way, the process returns from S17 to S2.

If the lock failure continues in S17, it is determined in S18 whether the retry is three times. Since this time is one retry, the process returns to S15, shuts off the motor control power supply, restarts at S16, and determines at S17 whether the lock failure continues. If the lock failure is resolved, the process returns to S2. If the lock failure continues, S18 is a second retry, so the process returns to S15 and the operations of S15 and S16 are repeated. If the lock failure is resolved in S17, the process returns to S2.

If the lock failure continues in S17, the number of retries is three in S18, so the process proceeds to S19 to shut off the motor control power supply, and repeat the steps of S20 and S21 thereafter to shut down or lower the motor drive power supply. Return to S2.

If there is no lock failure in S4, it is judged in S5 whether or not there is open phase rotation based on the open phase rotation detection signal 4a. If there is no open phase rotation, that is, normal rotation, the flow returns to S2. When the phase is lost, the process moves to S6, an alarm is displayed on the display 8 within 1 second after the operation is started, and the process returns to S2.

The alarm display on the display 8 continues until the power switch (not shown) of the circuit breaker is turned off. In addition to displaying these items on the display 8, an alarm can be sent to the outside by using a relay or the like.

4 to 7 are timing charts of the embodiment at the time of normal operation and at the time of failure. FIG. 4 shows a normal operation. The open phase rotation detection signal 4a and the lock detection signal 4b are at the indicated levels in the normal state due to the circuit configuration of the amplification / detection circuit 4.

FIG. 5 shows the case of the open phase rotation. During the open phase rotation, the motor current periodically becomes zero as described above, so the open / close phase detection signal that repeats "H" and "L" is detected from the amplification / detection circuit 4, and the CPU 5 Is supplied to. The CPU 5 determines in S5 that there is an open phase rotation, and in S6 supplies the illustrated alarm output to the display 8.

FIG. 6 shows a case where the lock failure at the time of descending causes a retry operation, and the lock failure at the time of ascent causes a retry operation. Regardless of the lowering command, the motor current is increased by locking the motor, as described above, and the "H" signal shown in the figure is detected by the amplification / detection circuit 4 and supplied to the CPU 5. The CPU 5 determines in S4 that there is a lock failure, and displays the lock failure on the display 8 in S7. In S8, it is determined that there is a lock failure at the time of lowering, the motor control power supply is cut off in S9, and the motor control power supply is turned on (retry) in S10. When the motor control power supply is cut off, the motor drive current is cut off and the motor current becomes zero. Therefore, the lock detection signal 4b returns to "L". When the motor control power supply is turned on again, the lock is eliminated, the open phase rotation is performed, and when the lowering is completed, the lowering cam switch is turned on, the relay 23 is energized, and the motor drive power supply is shut off. Next, a rising command comes, but since it is locked, the motor control power supply is turned off and then turned back on again in S15 to S18, and the phase is rotated after the second time the power is turned on again. The power is cut off.

FIG. 7 shows a case where the shut down rod does not operate due to a lock failure at the time of descending and the shut-off rod descends by its own weight, and the intermittent phase operation at ascending occurs. Despite the lowering command, the motor is locked, the lock detection signal 4b becomes "H", it is judged that the lock is broken in S4, and the alarm is displayed in S7. In S9 and S10, the motor control power is shut off and then on again, but the lock failure is not resolved. In S11, it is judged that there is a lock failure, and in S12 the motor control power is shut off and the motor drive current is shut off. Start descent. When the descent of the own weight is completed, the descent cam switch is turned on, the relay 23 is energized, the motor drive power is cut off, the process returns to S2, and the motor control power is turned on. When a rising command is received, the movable contact 22 is reversed, the relay 23 is de-energized, the motor drive power is turned on, the motor rotates in open phase, and the shutoff rod starts rising.

As shown in FIGS. 5 to 7, once the alarm display on the display unit 8 appears, it disappears until the power of the circuit breaker is shut off, regardless of whether the motor control power supply or the motor drive power supply is turned on or off. It's not there, so it's not overlooked

The open-phase rotation due to the retry after the lock failure described above has been confirmed by the test of the actual machine.

In the embodiment, the motor control power is cut off and then turned on again to eliminate the lock when the motor is locked. However, the present invention is not limited to this, and for example, when the motor is locked. This can be done by temporarily turning off all the control signals to the switching elements of the motor drive circuit, then turning them on sequentially to shut off the motor drive current and then turn it on again. Also, when the motor is locked, the motor drive power supply is turned off directly. It can also be implemented by re-injection. That is, according to the present invention, the lock is released by shutting off the drive current of the motor when the motor is locked and then turning it on again. The number of cut-off / re-input retries is not limited to once when descending and three times when ascending, but can be set freely.

In the embodiment, the lock or the open-phase rotation that occurs first is detected and an alarm is displayed on the display unit. However, the present invention is not limited to this, and the lock and the open-phase rotation are individually displayed on the display unit as an alarm. Good.

[0037]

[Effect of device]

 As described above, according to the present invention, it is possible to rotate the motor even when locked due to a phase loss or the like, and it is possible to immediately detect the lock or the phase loss rotation. In addition, the motor locks when the shutoff rod lowering command is issued, and when the motor cannot rotate even after a certain number of retries, the shutoff rod is quickly lowered by its own weight to ensure safety.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric system according to an embodiment.

[Fig. 2] Circuit diagram of ascending cam switch and descending cam switch

FIG. 3 is a flowchart showing the operation of the embodiment.

[Fig. 4] Timing chart for normal operation

FIG. 5 is a timing chart in the case where one phase of a motor has failed and is apparently operating normally.

[Fig. 6] Timing chart in the case of lock when descending → operation by retry → lock when ascending → operation by second retry

[Fig. 7] Timing chart in case of lock during descending → no operation by retry → descending by own weight → intermittent phase during rising

[Explanation of symbols]

 1 DC brushless motor 2 Motor current detection resistor 4 Amplification / detection circuit 5 CPU 7 Relay

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Toshio Takano 1-13-8 Kamikizaki, Urawa-shi, Saitama Nihon Signal Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A breaker for raising and lowering a breaking rod by a DC brushless motor, the lock detecting means detecting lock of the DC brushless motor, and the DC brushless motor according to an output signal of the lock detecting means. A circuit breaker, which is provided with a breaking / reclosing means for cutting off and reclosing the driving current of the device. 2. The circuit breaker according to claim 1, wherein the breaking / reclosing means cuts off and re-closes the control power source of the DC brushless motor according to the output signal of the lock detecting means. 3. In addition to the lock detecting means, an open-phase rotation detecting means for detecting open-phase rotation is provided, and a display means for performing a required display according to an output signal of these detecting means is provided. The circuit breaker according to claim 1 or 2. 4. The shut-off / re-closing means suspends the re-closing when the shut-off rod lowering command is issued and the lock is not released regardless of the cut-off / re-closing of the motor drive current for a predetermined number of times. The circuit breaker according to claim 1.