JPH1181798A - Door braking device for power door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop a door automatically and prevent the generation of an accident by flowing the current of a backup power supply through a control section when a current is not flowed through the control section of a power door at the time of service interruption. SOLUTION: When service interruption is generated or a power supply switch 18 is turned off by mistake during normal operation, a detector 20 detects service interruption or the off of the power supply switch 18, and inputs it to a controller 9. When the off signal of the power supply switch 18 is input, the controller 9 outputs a braking command to a control section 16, and the braking of an electric motor 5 is started by the current of a charging type battery 21. The controller 9 turns the bias current of a switching transistor 25 off after a fixed time, a current is not flowed through a relay 24, a relay contact 22 is turned off and the battery 21 and the control section 16 are detached, and the braking of the electric motor 5 is completed. Accordingly, the electric motor 5 can be braked surely by utilizing the current of the charging type battery 21 when the power supply switch 18 is turned off by mistake, and the accident that a person collides with a door can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for braking an automatic door at the time of power failure or power off.

[0002]

2. Description of the Related Art As an automatic door, a belt is wound around a driving pulley and a driven pulley which are rotated by an electric motor, and the door is connected to this belt to open and close the door by rotating and stopping the electric motor. Is common.

[0003] As a control method of the automatic door described above, the electric motor is rotated forward by the human body detection signal detected by the human body detector, the door is opened, and the door is stopped at the fully open position. Generally, a method of closing the door in reverse to stop at the fully closed position is common.

In the above control method, in order to shorten the opening / closing time of the door, the electric motor is rotated forward and backward at a high speed to open and close the door at a high speed, and the door is closed and moved. When the closing deceleration point is detected, the electric motor is braked, then the forward / reverse rotation is performed at low speed to open the door at a low speed to the predetermined position, the door is closed, and then the brake is applied to stop at the fully open position and the fully closed position. I have.

In order to brake the above-described electric motor, a reverse rotation braking system in which a reverse current is applied to the winding of the electric motor to generate a torque opposite to the rotation direction of the electric motor, Is short-circuited, the winding is short-circuited, and heat is consumed as heat by the self-resistance of the winding (that is, a power generation control method in which an electric motor is operated as a generator).

[0006]

As described above, in an automatic door that opens and moves and closes a door by controlling an electric motor as described above, a power failure occurs when the door is moving open and close, or an erroneous operation occurs. When the power switch is turned off, the control function of the automatic door does not work, and the door moves by inertia.

[0007] For this reason, the door may collide with a person or a fully open position or a fully closed position, which is dangerous and may damage each part of the automatic door.

Accordingly, an object of the present invention is to provide a door braking device for an automatic door which can solve the above-mentioned problems.

[0009]

According to a first aspect of the present invention, a backup power supply connected to a control unit of an electric motor is provided for an automatic door in which an electric motor is rotated forward / reversely to open / close a door. Detecting means 20 for detecting that no current flows to the control section 16, and detecting the current of the backup power supply by the control section 1 based on a detection signal of the detecting means 20.
6, and a controller 9 for outputting a braking command to the control unit 16 is provided.

According to a second aspect of the present invention, a rechargeable battery 21 is used as a backup power source in the first aspect of the present invention, and the rechargeable battery 21 is connected to a control unit 16 via a switch and a charging circuit 23.
And a power supply 8 connected thereto, and the switch is turned on by the controller 9 during the normal door opening / closing operation, and is turned off after a certain period of time after a power failure or power off. is there.

A third invention relates to an automatic door which opens and closes the door 4 by rotating the electric motor 5 forward and backward.
The commercial power supply 11, the power supply circuit 14, and the smoothing circuit 15 form the power supply 8, and the output side of the smoothing circuit 15 is connected to the electric motor 5 via the control unit 16, and the capacity of the smoothing capacitor 19 of the smoothing circuit 15 A detecting means for detecting that no current flows through the control unit, and a controller for outputting a braking command to the control unit based on a detection signal of the detecting means; 9. A door braking device for an automatic door, comprising:

[0012]

According to the first aspect of the present invention, a power failure occurs during the opening and closing movement of the door 4 or the power switch is turned OFF by mistake.
F, the current of the backup power supply flows to the control unit 16 when the current stops flowing to the control unit 16. At the same time, a braking command is input to the control unit 16, and the electric motor 5 is braked by the current of the backup power supply.

As a result, the door 4 is immediately braked and stopped, so that the door 4 does not collide with a person and does not collide with the fully open position or the fully closed position.

According to the second aspect of the present invention, the rechargeable battery 21 is charged during the normal door opening / closing operation, and the electric motor 5 is braked for a certain time by the current of the rechargeable battery 21 during a power failure or power OFF, so that the electric motor 5 is braked for a certain time. Later, since the rechargeable battery 21 and the control unit 16 are separated, the rechargeable battery 21 can be used repeatedly.

According to the third aspect of the present invention, the smoothing capacitor 19 of the smoothing circuit 15 stores a current enough to brake the electric motor 5, and a power failure occurs during the opening and closing movement of the door 4. When the power switch is turned off and the current stops flowing to the control unit 16 by mistake, a braking command is input to the control unit 16. Therefore, the electric motor 5 is braked by the current stored in the smoothing capacitor 19. You.

As a result, the door 4 is immediately braked and stopped, so that the door 4 does not collide with a person and does not collide with the fully open position or the fully closed position.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
A belt 3 is wound around the driven pulley 2 and a door 4 is connected to the belt 3. When the drive pulley 1 is rotated forward and backward by the electric motor 5, the door 4 is opened and closed toward the fully open position 6 and the fully closed position 7, respectively.

The electric motor 5 is energized and controlled by a current from a power supply 8 according to a command from a controller 9, and the electric motor 5 is braked according to a braking command from the controller 9. For example, the rotation speed of the electric motor 5 is detected by the encoder 10 or the like and sent to the controller 9. The controller 9 calculates the current position of the door 4, and when the calculated door current position reaches the set door setting position, the controller 9 brakes. A command is output to brake the electric motor 5.

As shown in FIG. 2, the power supply 8 is composed of an AC commercial power supply 11, a power supply circuit 14 having a power supply truss 12 and a rectifier circuit 13, and a smoothing circuit 15, and the output side of the smoothing circuit 14 is provided. It is connected to the electric motor 5 via the control unit 16 and to the controller 9 via the stabilized power supply circuit 17.

The power supply 8 is provided with a power switch 18. When the power switch 18 is turned on, a DC current flows through the control unit 16 and the controller 9, and the power switch 18 is turned on.
When is turned off, the flow stops. The smoothing circuit 15 includes a smoothing capacitor 19.

The power supply 8 is provided with a detecting means 20 for detecting that no current flows to the control unit 16 due to a power failure and the power switch 18 being turned off. For example, power transformer 1
The power failure and the OFF of the power switch 18 are detected by determining that the sine wave of the AC current (50 HZ or 60 HZ) on the output side of No. 2 has not been present for a predetermined time or more. This detecting means 20
Is sent to the controller 9, and the controller 9 outputs a braking command to the controller 16 immediately after the detection signal is input.

A backup power supply, for example, a rechargeable battery 21 is provided between the output side of the smoothing circuit 15 and the control unit 16.
Are connected via a switch, for example, a relay contact 22 and a charging circuit 23. The relay 24 of this relay contact 22
Is connected to the output side of the stabilized power supply circuit 17 via the switching transistor 25. The switching transistor 25 is turned on to apply a bias current from the controller 9, and when turned on, a current flows through the relay 24. Reference numeral 26 denotes a backflow preventing diode.

Next, the operation will be described. The switching transistor 25 is turned on at the same time when the power switch 18 is turned on,
Since a current flows through the relay 24 and the relay contact 22 is turned on, the rechargeable battery 21 is connected to the output side of the smoothing circuit 15, and the rechargeable battery 21 is charged.

In this state, the human body detection signal from the human body detection switch 27, the rotation speed of the electric motor from the encoder 10, and the like are input to the controller 9, and the controller 9 sends a current control command to the control unit 16 in a preset pattern. , And outputs a braking command.
Drives forward / reverse rotation and brakes to open and close the door 4.

If a power failure occurs during the normal opening / closing operation described above,
If the power switch 18 is turned off by mistake, the detection circuit 20 detects a power failure and the power switch 18 is turned off and inputs the power switch 18 to the controller 9.

The controller 9 has a power failure, power switch 18
When the OFF signal is input, a braking command is immediately output to the control unit 16, and the electric motor 5 is started to be braked by the current of the rechargeable battery 21. After a certain time required to stop the electric motor 5, the controller 9 turns off the bias current of the switching transistor 25, the current stops flowing to the relay 24, and the relay contact 22 is turned off.
The rechargeable battery 21 and the control unit 16 are disconnected, and the braking of the electric motor 5 ends.

As a result, a power failure, a power switch 18O
During the FF, the electric motor 5 is braked for a certain time. The braking of the electric motor 5 is performed by dynamic braking as in the prior art, but may be performed by reverse braking.

Because of this, while the door 4 is open and moving,
If the power fails during the closing movement,
When the switch is turned off, the electric motor 5 can be reliably braked by using the current of the rechargeable battery 21, so that the door 4 does not collide with a person or collide with the fully open position 6 and the fully closed position 7.

The rechargeable battery 21 is charged when the door 4 is normally opened and normally closed. Power outage,
After the electric motor 5 is braked by the power switch 18 OFF, the switching transistor 25 is OFF and the relay contact 22 is OFF, so that the rechargeable battery 21 does not conduct to the control unit 16.
Current is not wasted.

The rechargeable battery 21 is connected to a charging circuit 23.
To the output side of the smoothing circuit 15 through the power switch 1
The battery may be charged when 8 is turned on, and current may be continuously supplied to the control unit 16 when a power failure or power switch is turned off.

Further, instead of the rechargeable battery 21, a pre-charged battery may be used as a backup power source.
In this case, a precharged battery 28 is connected to the output side of the smoothing circuit 15 via the relay contact 22 as shown in FIG.

When the power switch 18 is turned on (ie, during the normal opening / closing operation), the relay contact 22 is turned off, and the battery 28 is disconnected from the output side of the smoothing circuit 15.

If the detection circuit 20 detects a power failure,
When the FF is detected and input to the controller 9, the controller 9 outputs a braking command to the control unit 16, applies a bias current to the switching transistor 25, a current flows through the relay 24, and the relay contact 22 is turned on.
The electric current of the battery 28 flows from the control unit 16 to the electric motor 5 to start braking the electric motor 5.

After a certain period of time, the controller 9 stops applying the bias current to the switching transistor 25, turns off the relay contact 22, disconnects the battery 28 from the output side of the smoothing circuit 15, and terminates the braking of the electric motor 5. I do.

As described above, the door can be stopped by braking the electric motor 5 for a certain time when the power is turned off and the power switch 18 is turned off by using the battery 28 charged in advance, and the current of the battery 28 is controlled for a certain time by the control unit 16. Because it flows to
It is not wasted. Note that the relay contact 22 may be kept ON to use up the current of the battery 28.

The capacity of the backup power supply may be a capacity capable of supplying a current corresponding to a braking force enough to stop the door 4 to the electric motor 5 at the time of a power failure or when the power switch 18 is turned off.

Next, a specific example of power generation braking of the electric motor 5 will be described. As shown in FIG.
Is short-circuited by turning off the three first drivers 31 and turning on the three second drivers 32, whereby the electric motor 5 is braked. Also, the electric motor 5 can be similarly braked by turning on the three first drivers 31 and turning off the three second drivers 32.

During normal opening and closing movements, the time width of the first driver 31OFF and the second driver 32ON is adjusted to intermittently short-circuit the winding 30 to gradually brake.
At the time of the above-mentioned power failure, when the power switch 18 is turned off, the first driver 31 is kept turned off,
Is kept ON, and the winding 30 is continuously short-circuited to perform rapid braking.

Thus, when a power failure occurs, the power switch 18
Since the current required for braking the electric motor when turned off can be reduced, the capacity of the backup power supply can be reduced and the door 4 can be stopped immediately.

Next, a second embodiment of the present invention will be described. As shown in FIG. 5, the capacity of the smoothing capacitor 19 of the smoothing circuit 15 is set to be large enough to store a current required for braking the electric motor 5.

In this manner, the electric motor 5 can be braked by the current stored in the smoothing capacitor 19 at the time of a power failure or when the power switch 18 is turned off.

In each of the above embodiments, the power transformer 1
2 and the rectifier circuit 13, the power supply circuit 14 is used, but the rectifier circuit 13 alone may be used as the power supply circuit 14 without using the power transformer 12 to rectify the AC of the commercial power supply 11.
A switching type power supply circuit may be used.

[0043]

According to the first aspect of the present invention, when the door 4 is opened and closed, a power failure occurs, or when the power switch is turned off by mistake and the current stops flowing to the control unit 16, the backup power supply Flows through the control unit 16. At the same time, a braking command is input to the control unit 16, and the electric motor 5 is braked by the current of the backup power supply.

As a result, the door 4 is immediately braked and stopped, so that the door 4 does not collide with a person and does not collide with the fully open position or the fully closed position.

According to the second aspect of the invention, the rechargeable battery 21 is charged during the normal door opening / closing operation, and the electric motor 5 is braked for a predetermined time by the current of the rechargeable battery 21 during a power failure or power off, After a certain time, the rechargeable battery 21 and the control unit 16 are disconnected, so that the rechargeable battery 21 can be used repeatedly.

According to the third aspect of the invention, the smoothing circuit 1
5 is stored in the smoothing capacitor 19 so that the electric motor 5 can be braked. If the door 4 is opened and closed, the power is cut off or the power switch is turned off by mistake.
F, when the current stops flowing to the control unit 16, the control unit 1
Since the braking command is input to the motor 6, the electric motor 5 is braked by the current stored in the smoothing capacitor 19.

As a result, the door 4 is immediately braked and stopped, so that the door 4 does not collide with a person and does not collide with the fully open position or the fully closed position.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an automatic door.

FIG. 2 is a circuit diagram showing a first embodiment of the present invention.

FIG. 3 is a circuit diagram showing another example of a backup power supply.

FIG. 4 is an explanatory diagram of a braking operation.

FIG. 5 is a circuit diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Door 5 ... Electric motor 8 ... Power supply 9 ... Controller 11 ... Commercial power supply 12 ... Power supply transformer 13 ... Rectifier circuit 14 ... Power supply circuit 15 ... Smoothing circuit 16 ... Control part 18 ... Power switch 19 ... Smoothing capacitor 20 ... Detection circuit 21 ... Rechargeable battery (backup power supply) 28 ... Battery (backup power supply)

Claims (3)

[Claims] 1. An automatic door that opens and closes a door 4 by rotating an electric motor 5 in a normal direction and a reverse direction, wherein a current flows through a backup power supply connected to a control unit 16 of the electric motor 5 and the control unit 16. Detecting means 20 for detecting that there is no backup power supply, and supplying a current of the backup power supply to the control unit 16 according to a detection signal of the detecting means 20;
A door braking device for an automatic door, wherein a controller 9 for outputting a braking command to the control unit 16 is provided. 2. A rechargeable battery 21 for a backup power supply
The rechargeable battery 21 is used as a switch and a charging circuit 2
The power supply 8 is connected between the control unit 16 and the power supply 8 via the switch 3, and the switch is turned on by the controller 9 during the normal door opening / closing operation, and is turned off after a certain time from the power failure and power off. A door braking device for an automatic door according to claim 1. 3. An automatic door that opens and closes the door 4 by rotating the electric motor 5 forward / reversely. A power source 8 is provided by a commercial power supply 11, a power supply circuit 14, and a smoothing circuit 15, and an output of the smoothing circuit 15 is provided. Side is connected to the electric motor 5 via the control unit 16, the capacity of the smoothing capacitor 19 of the smoothing circuit 15 is set to a size large enough to store a current for braking the electric motor 5, and no current flows to the control unit 16. Detecting means 20 for detecting the fact that the control unit 1
6. A door braking device for an automatic door, wherein a controller 9 for outputting a braking command is provided at 6.