JP2575559B2 - Elevator door control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator door driving device, and more particularly to an elevator door control device for detecting a failure of a speed detector of an elevator door driving motor.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a car portion of an elevator of a conventional elevator door control device disclosed in Japanese Utility Model Laid-Open No. 59-131009. In the figure, 1 is an elevator car, 2 is a door of the car 1, 3 is a motor provided on the upper part of the car 1 to drive the door 2, and 4 is directly connected to a shaft of the motor 3 to rotate the motor 3. A speed detector for detecting, for example, a pulse encoder, 5a is a pulley directly connected to a shaft of the motor 3, 5b is a pulley fixed to one end of the car 1, above the door 2, and 5c is fixed to the same shaft as the pulley 5b. The pulley 5d is the other end of the car 1 and is a pulley fixed above the door 2, the belt 6 is wound around the pulley 5a and the pulley 5b, and the pulley 5 is wound around the pulley 5c and the pulley 5d. A belt to which the door 2 is connected at its lower end, 8 is a fully closed position switch provided above the door 2 and near the fully closed position of the door 2, and 9 is provided above the door 2 and near the fully opened position of the door 2. The fully open position switch. In FIG. 4,
The door 2 is in a fully closed state, and the fully opened state is indicated by a dotted line.

Next, the operation of the above-described conventional example will be described.
The door 2 is driven to open and close by the output of the motor 3 reduced by the belt 6. The pulse encoder 4 rotates in synchronization with the rotation of the motor 3 and generates a pulse signal. Based on this pulse signal, a door 2 is controlled by a control circuit (not shown).
Is calculated and the rotation speed of the motor 3 is calculated, and the rotation speed of the motor 3 is controlled according to a speed command corresponding to the position of the door 2. By controlling the rotation speed of the motor 3 in this way, the door opening / closing drive of the door 2 is controlled.

For example, if the pulse encoder 4 fails, the control circuit cannot calculate the position of the door 2 and the rotation speed of the motor 3 because the pulse encoder 4 does not generate a pulse signal. Therefore, after the occurrence of the failure of the pulse encoder 4, the control circuit cannot properly control the door opening / closing drive of the door 2. In such a case, the control circuit generally detects a failure of the pulse encoder 4 or the like only by detecting that the pulse signal of the pulse encoder 4 is not generated.

[0005]

In the conventional elevator door control device, the failure of the pulse encoder 4 and the like is detected based only on the pulse signal of the pulse encoder 4. Therefore, for example, the door 2 is damaged by dust or mischief.
Is restricted and the motor 3 does not rotate even though the speed command is generated by the control circuit, and the pulse encoder 4
Is not generated, it is erroneously detected that the pulse encoder 4 has failed even if the pulse encoder 4 is normal. For this reason, there is a problem that it is not easy to automatically detect a failure of the pulse encoder 4 or the like without erroneous detection.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is intended to easily and automatically detect a failure of a speed detector of an elevator door driving motor without erroneous detection. It is an object of the present invention to obtain an elevator door control device capable of performing the following.

[0007]

According to the present invention, there is provided an elevator door control device comprising: a position detecting means disposed at least near one of a fully opened position and a fully closed position of a door; and a change in an output signal of the position detecting means. A control circuit for detecting a failure of the speed detector based on the rotation speed of the motor detected from the output of the speed detector at times, and driving the motor at a low rotation speed and a low torque after detecting the failure. is there.

[0008]

According to the present invention, the control circuit detects the rotation speed of the motor detected from the output of the speed detector when the output signal of the position detection means arranged at least near one of the fully opened and fully closed positions of the door changes. Based on the detected failure, the motor is driven at a low rotational speed and a low torque.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 3 and 4 are the motor and the pulse encoder shown in FIG. 4, respectively, and 10 is a control circuit. The control circuit 10 includes a central processing unit (hereinafter, referred to as a CPU) 11, a pulse count unit 12 for counting pulse signals synchronized with the rotation of the motor 3 from the pulse encoder 4, and a CPU 11 such as a flowchart shown in FIG. A ROM 13 storing a processing program, a speed command of the motor 3 during a normal operation, a low speed command and a low torque command of the motor 3 during an abnormal operation, and a position detecting means as a fully closed position switch or a fully opened position switch. A signal from the elevator control panel 21 for generating the position switch 20 and the door opening command or the door closing command is taken in, and a control signal is notified to the elevator control panel 21.
Pulse encoder 4 to failure indicator 22 using (LED) etc.
An input / output port 14 for outputting a signal indicating a failure such as
The RAM 15 stores the processing result of the CPU 11 and the state of the position switch 20, and the like, and a PWM unit 16 that outputs a pulse width modulation (PWM) signal according to the processing result of the CPU 11, and each of these circuits is a bus line. They are interconnected via 17. Reference numeral 23 denotes a gate signal generation circuit which is connected to the PWM unit 16 and generates a gate signal according to the PWM signal. Reference numeral 24 denotes a power supply. Reference numeral 25 switches DC power from the power supply 24 according to a signal from the gate signal generation circuit 23. A power circuit that performs drive control and speed control of the motor 3 while supplying the motor 3 to the motor 3. The position switch 20 is, for example, turned on when the door is fully closed or fully opened, and is turned off when the door starts to open or close.

Next, the operation of the above-described embodiment will be described with reference to FIG. 2 by taking the operation of the position switch 20 as a fully closed position switch to open the door from the fully closed state as an example. First, the operation when the pulse encoder 4 is normal will be described. In the fully closed state of the door at time t ₀ , as shown in FIG. 2A, the position switch 20 is in the ON state and the motor 3 does not rotate, so that the pulse encoder 4 does not rotate and the pulse encoder 3 No output is generated. Thereafter, a door opening command is generated from the elevator control panel 21 and read into the input / output port 14, and when the CPU 11 reads this door opening command, C
The PU 11 rotates the motor 3 via the PWM unit 16, the gate signal generation circuit 23, and the power circuit 25. The pulse encoder 4 also rotates in synchronization with the rotation of the motor 3, and the pulse encoder 4 changes over time with the waveform b in FIG.
Generates a pulse signal such as ₁ . This pulse signal is counted by the pulse count unit 12, and the pulse count result is read by the CPU 11. CPU11 calculates a rotational speed of the motor 3 which changes as the waveform c ₁ position of the door and FIG. 2 (c) Based on the pulse count result, reading speed command corresponding to the calculated position of the door from the ROM11 The PWM signal corresponding to the speed command is output from the PWM unit 17 to the gate signal generation circuit 23. The gate signal generation circuit 23 converts the PWM signal into a gate signal and outputs it to the power circuit 25. Then, the power circuit 25 supplies the output of the power supply 24 to the motor 3 according to the gate signal, and drives the motor 3. As a result, the door is driven to open. Also, during this period, at time t ₁ as shown in FIG. 2 (a), the door begins to door open from the fully closed state, the state of the position switch 20 is turned from ON to OFF. The off state of the position switch 20 is read by the CPU 11 via the input / output port 12, and R
Stored in AM16.

Next, the operation when the pulse encoder 4 has failed will be described. If the pulse encoder 4 fails,
Also be rotated motor 3, the pulse encoder 4 as b ₂ in FIG. 2 (b) does not generate a pulse signal. Therefore, the rotational speed of the motor 3 becomes 0rpm as waveform c ₂ in FIG. 2 (c). Therefore, when the door starts to be opened from the fully closed state and the position switch 20 is turned from on to off at time t _{1 as} shown in FIG. 2A, the CPU 11 reduces the rotation speed of the motor 3 to 0 rpm. Is detected, the position switch 20
Motor 3 changes from on to off
Since the rotation speed of the pulse encoder 4 is 0 rpm, it is determined that the pulse encoder 4 has failed, and this is displayed on the failure display 22. After determining that the pulse encoder 4 is out of order, the CPU 11 reads the abnormal low speed command and low torque command from the ROM 13 and drives the motor 3 at low rotation speed and low torque in accordance with these commands. Thus, the door is driven to open at a lower speed than usual.

The processing operation of the CPU 11 at this time will be described with reference to FIG. First, the operation when the pulse encoder 4 is normal will be described. In the fully closed state, the ON state of the position switch 20 is stored in the RAM 15. In this state, in step S1, it is determined whether or not the position switch 20 in the current process is ON. Since the position switch 20 is ON, the process proceeds to step S6 without performing failure detection. In step S6, the state of the position switch 20 in the current process is stored in the RAM 15 for use in the next process as the state of the position switch 20 in the previous process, and the operation ends.

When the door opening operation starts, the position switch 20 operates from on to off. Therefore, in step S1, it is determined that the position switch 20 in this process is off, and the process proceeds to step S2. In step S2, it is determined whether or not the position switch 20 in the previous process is on. In the previous process, the door is fully closed and the position switch 20 is on, so the process proceeds to step S3. In step S3, it is determined whether or not the rotation speed of the motor 3 is 0 rpm. Since the rotation speed of the motor 3 is detected because the pulse encoder 4 is normal, the process proceeds to step S6 without performing failure detection. In the processing after this, the fully closed position switch 20 remains off, so that the position switch 20 in this processing is determined to be off in step S1, and the position switch 20 in the previous processing is determined to be off in step S2. It is determined, the process proceeds to step S6 without performing the failure detection, the same processing as described above is performed, and the operation ends.

Next, the operation when the pulse encoder 4 fails will be described. In the fully closed state, the ON state of the position switch 20 is stored in the RAM 15. In this state, in step S1, it is determined whether or not the position switch 20 in the current process is ON. Since the position switch 20 is ON, the process proceeds to step S6 without performing failure detection, and the position switch 20 in the current process as described above. Is stored in the RAM 15 for use in the next processing as the state of the position switch 20 in the previous processing, and the operation is terminated.

When the door opening operation starts, the position switch 20 operates from on to off. Therefore, in step S1, it is determined that the position switch 20 in this process is off, and the process proceeds to step S2. In step S2, it is determined whether or not the position switch 20 in the previous process is on. In the previous process, the door is fully closed and the position switch 20 is on, so the process proceeds to step S3. In step S3, it is determined whether the rotation speed of the motor 3 is 0 rpm. Since the pulse encoder 4 has failed, the rotation speed of the motor 3 is 0 rp.
m. Since the rotation speed of the motor 3 is 0 rpm even though the position switch 20 is operating from on to off, the pulse encoder 4 determines that a failure has occurred, and step S4
Proceed to. In step S4, the pulse encoder 4
Is displayed by turning on an LED or the like. Subsequently, in step S5, a low-speed command and a low-torque command are read from the ROM 11 to open the door at a lower speed than usual. Subsequently, the process proceeds to step S6, where the same processing as described above is performed, and the operation ends.

Note that even when the position switch 20 changes from off to on, that is, when the door is fully closed from the door closing drive,
The same operation is performed, and the failure of the pulse encoder 4 is detected.

As described above, in the above embodiment, when the rotation speed of the motor 3 is detected to be 0 rpm during the operation of the position switch 20 (ON → OFF, OFF → ON), the pulse encoder 4 fails. By determining that there is a failure, the failure of the pulse encoder 4 can be easily and automatically detected.

In the above embodiment, the case where the position switch 20 is a fully closed position switch has been described.
The same operation is performed by outputting a door closing command from
A similar effect is achieved. The same effect can be obtained by using both the fully closed position switch and the fully open position switch.

[0019]

As described above, according to the present invention, the position detecting means disposed at at least one of the positions near the fully open and fully closed positions of the door, and the output of the speed detector when the output signal of the position detecting means changes. And a control circuit for driving the motor at a low rotational speed and a low torque after the failure is detected based on the rotational speed of the motor detected from the pulse encoder 4. It is possible to easily and automatically detect a failure without erroneous detection, and to prevent a dangerous situation for an elevator user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a waveform chart for explaining the operation of one embodiment of the present invention.

FIG. 3 is a flowchart for explaining the operation of one embodiment of the present invention.

FIG. 4 is a configuration diagram illustrating a conventional elevator door control device.

[Explanation of symbols]

 3 Motor 4 Pulse encoder 11 CPU 12 Pulse count unit 13 ROM 14 I / O port 15 RAM 16 PWM unit 20 Position switch

Claims (1)

(57) [Claims] 1. A position of the door and a rotation speed of the motor are detected based on an output of a speed detector for detecting rotation of a motor for driving an elevator door, and a speed command corresponding to the position of the door is generated. And, in the elevator door control device that drives the motor based on the speed command, a position detection unit disposed at least near one of a fully opened position and a fully closed position of the door, and an output signal of the position detection unit Based on the rotation speed of the motor detected from the output of the speed detector at the time of change,
An elevator door control device, comprising: a control circuit that detects a failure of the speed detector and drives the motor at a low rotation speed and a low torque after the failure is detected.