JPH089464B2 - Elevator door controls - Google Patents

Description

The present invention relates to a control device for an elevator door, and
In particular, the present invention relates to an elevator door control device that drives and controls an electric motor that opens and closes an elevator door.

[Prior Art] FIG. 7 is an example of a front view showing a mechanical configuration of an elevator door to which the control device for an elevator door according to the related art and the present invention is applied.

In the figure, (1) is an elevator door, (2) is an entrance / exit of an elevator car, (3) is a door hanger fixed to the upper part of the elevator door (1), and (4) is a door hanger (3) installed. Hanger case, (5) is a door rail attached to the hanger case (4), (6) is the upper part of the door rail (5) and is rotated to lift the elevator door (1).
The hanger roller (7) that guides the opening and closing of the elevator rail (7) is an up-thrust roller that rotates the lower part of the door rail (5) and guides the opening and closing of the elevator door (1). ) Are both rotatably attached to the door hanger (3). (8) is an engagement device attached to the elevator door (1),
A device installed on the landing door in the door zone (not shown)
By engaging with the elevator car, the elevator door (1) on the elevator car side and the landing door are interlocked to perform the opening / closing operation.
(9) is a drive device installed on the upper part of the hanger case (4), and this drive device (9) drives the elevator door (1). (10) is a door driving electric motor built in the driving device (9), and (11) is a four-link system for transmitting the driving force of the driving device (9) to the elevator door (1). The elevator door (1) is opened and closed via 11). (12) is the closed state (CL
T) sensor, (13) is an open state (OLT) sensor indicating an open state of the door, and (14a) and (14b) are stoppers on the door closing side and the door opening side which are made of an elastic body. (15) is a door control device composed of an inverter or the like for driving the electric motor (10), (16) is a door stop fitting that hits the stoppers (14a) and (14b), and (17) is the closed state sensor ( 12) and a sensor fitting for actuating the open state sensor (13).

In the elevator door having the above configuration, the door control device (15) appropriately controls the drive of the electric motor (10) of the drive device (9) to open and close the elevator door (1) via the link (11). To do.

Next, a vector control inverter circuit for driving the elevator door having the above configuration will be described.

FIG. 8 is a block diagram showing a control circuit of an inverter by vector control. The power supply of this circuit is, for example, 200V or 220V three-phase AC or single-phase AC.

In the figure, (18) is a diode bridge that rectifies the alternating current, (19) is a smoothing capacitor that smoothes the direct current rectified by the diode bridge (18), and (20) is a switching element such as a transistor or FET. The inverter (21) is a PWM unit that generates pulse width modulation (PWM) pulses. Each switching element of the inverter (20) is appropriately driven by the PWM pulse from the PWM section (21), and the pulse width is modulated, so that the diode bridge (1
8) Replace the DC voltage rectified by the smoothing capacitor (19) with a sinusoidal motor current. In this way, the speed and torque of the electric motor (10) are appropriately controlled by the inverter (20). Reference numeral (10a) is an encoder attached to the electric motor shaft, and the actual speed of the electric motor (10) is detected by this encoder (10a). (22) is the speed command ω
A speed command generator that generates r, (23) is an adder,
The actual speed ωr ^* of the electric motor (10) detected by the speed command ωr and the encoder (10a) by the adder (23)
And are compared to obtain the speed deviation Δωr. (twenty four)
Is a speed amplifier that calculates the torque required for the electric motor (10) so as to follow the speed command ωr and outputs the torque command iq,
(25) is a slip calculation unit that generates a slip frequency ωs, and this slip frequency ωs is, for example, the torque current iq.
And excitation current command, which is usually a constant value in the constant torque range
It is calculated by inputting id. (26) is the slip frequency ωs and the velocity ωr detected by the encoder (10a)
^* Is an adder that adds and, (27) is a phase counter that functions as an integrator, and the rotation angle θr of the magnetic field of the motor (10)
= ∫ (ωr ^* ± ωs) dt is calculated. (28) is a phase angle calculator for calculating the phase angle θi from the torque component current iq and the excitation component current command id, and (29) is the actual current phase angle obtained by adding the phase angle θi and the rotation angle θr of the magnetic field. an adder for calculating θ = θr + θi, (30) a current amplitude calculator for calculating current amplitude | I | from the torque component current iq and the excitation component current command id,
Reference numeral (31) is a current command generator that generates U-phase and V-phase current commands from the actual current phase angle θ and the current amplitude | I |.
The U-phase current command Iu is obtained as Iu = | I | · sin θ, and the V-phase current command Iv is obtained as Iv = | I | · sin (θ + 2π / 3). (32) is a DC CT for detecting the U-phase current Iu ^* and V-phase current Iv ^* of the electric motor (10), (33) is the U-phase and V-phase current command Iu from the current command generator (31), This is a current amplifier section for obtaining the current deviations ΔIu, ΔIv, ΔIw = −ΔIu−ΔIv of each phase from Iv and the actual motor currents Iu ^* , Iv ^{* of the} U and V phases. Then, a three-phase PWM voltage command corresponding to the current deviations ΔIu, ΔIv, and ΔIw of these phases is output from the PWM section (21) as a switching signal C to the inverter (2
It is output to 0). When a predetermined pulse train is supplied from the PWM section (21) to the inverter (20), each switching element of the inverter (20) operates, whereby the current, voltage, frequency, etc. of the electric motor (10) have predetermined values. Controlled by. Each component of the speed command generating section (22) to the current command generating section (31) of the control circuit of the inverter is composed of a microcomputer (40) as an arithmetic control means.

The inverter (20) is appropriately controlled through the control circuit of the inverter having the above configuration, and the speed and torque of the electric motor (10) are feedback-controlled. That is, the rotation speed and drive torque of the electric motor (10) are controlled by appropriately controlling the current, voltage, frequency, etc. of the electric motor (10) so as to have predetermined values. Further, such a vector control inverter is usually composed of a microcomputer (40) shown by a chain line in FIG.

Next, the hardware configuration of the microcomputer (40) as the arithmetic control means will be described. FIG. 9 is a circuit diagram showing a circuit in which an inverter control circuit of a conventional elevator door control device is configured by a microcomputer.

In the figure, (41) is a CPU which is a central processing unit, and (4
2) is a ROM that stores the specified processing programs,
(43) is a RAM that stores data and the like. (44)
Is an interrupt control unit that performs interrupt processing by the ΣALARM signal, (45) is a DA converter that outputs the U-phase and V-phase current commands Iu, Iv, and (46) is a microcomputer that outputs each control input signal ( (40) is an input interface for capturing, (47) is an output interface for outputting the result of program processing, (48) is an anomaly indicator consisting of a seven-segment light emitting diode indicator for displaying the anomaly content by code number, (49) ) Is a reversible counter for detecting the speed of the electric motor (10) by the pulse train from the encoder (10a), (50) is a watchdog counter for monitoring the processing time of the program, and the program executes a predetermined routine within a predetermined time. Outputs the WDOUT signal when it does not pass. (Five
1) is a bus which is a passage of each data.

Further, the conventional elevator door control device has an abnormality detection holding circuit that detects and holds an abnormality of the control circuit of the inverter (20).

FIG. 10 is a circuit diagram showing an abnormality detection holding circuit used in a conventional elevator door control device. It should be noted that this abnormality detection / holding circuit is configured by other than a microcomputer.

In the figure, (52) is a three-phase full-wave rectifier circuit that obtains a DC signal from a feedback signal of a two-phase AC motor current,
Reference numeral (53) is a comparator, and reference numeral (54) is a reference power source for the comparator (53). (55) is a flip-flop that becomes a holding state when the motor currents Iu, Iv, Iw become equal to or more than a predetermined value Vref, (56) and (59) are OR gates, and (57) is the ninth
In the figure, a one-shot circuit for differentiating the watchdog alarm signal WDOUT from the watchdog counter (50), and (58) is a flip-flop which is held when the watchdog alarm signal WDOUT is output. The above flip-flops (55) and (58) are reset by a RESET pulse (not shown) when the power is turned on.

In the abnormality detection holding circuit having such a configuration, for example, when an overcurrent abnormality is held in the flip-flop (55), the inverter (20) is cut off through the OR gates (56) and (59). BCUT signal is output. Furthermore,
When the ΣALARM signal is input to the microcomputer (40) as an arithmetic control unit via the interrupt control unit (44), the microcomputer (40) executes the program shown in FIG. FIG. 11 is a flowchart showing an interrupt program executed by the microcomputer when an abnormality occurs.

In the figure, first, in step S1, the presence or absence of an alarm signal is determined. If the alarm signal is “present”, the abnormal code is displayed in step S2, and the BCUT1 output for shutting off the base of the inverter (20) is output from the output interface (47) in step S3. Then, after turning off the inverter (20), stop processing of the microcomputer (40) is performed in step S4. If the alarm signal is "absent" in step S1, the interrupt process is regarded as completed in step S5, the above interrupt process is not executed, and the process directly returns to the main routine. Note that step S1
The determination of the presence or absence of an alarm signal is performed by checking whether there is an abnormal status signal such as ALARM-1 or ALARM-2 in order to distinguish the type of alarm. It also plays the role of a discrimination circuit.

Here, a time chart of each signal when the motor overcurrent occurs and the base is cut off will be described.

FIG. 12 is a time chart showing a state in which an electric motor overcurrent occurs and the base is cut off.

In the figure, Iuvw is the motor current, Vref is the reference voltage for the comparator (53), OCR is the output of the comparator (53), BCUT is the base cutoff signal. When the motor current Iuvw is in the overcurrent state (that is, the motor current is If Iuvw is converted to a voltage and exceeds the reference voltage Vref for the comparator (53),
The output OCR of the comparator (53) is inverted, and the base cutoff signal BCUT is output from the abnormality detection holding circuit. As a result, the base of the inverter (20) is shut off and the motor current
Iuvw becomes 0.

When an abnormality occurs in the control circuit of the inverter (20) by the above series of interrupt processing, the drive of the inverter (20) is immediately stopped and the electric motor current of the electric motor (10) is stopped. .

Note that the programs for the velocity loop calculation and the vector control calculation are not directly related here, so the description thereof will be omitted. Also, as another conventional elevator door control device,
There is also a technique disclosed in Japanese Patent Application Laid-Open No. 1-92191, which increases the drive torque of the door motor in response to an increase in the drive load of the elevator door to reliably open and close the elevator door. Since this technique is also not directly related to the above technique, its explanation is omitted here.

[Problems to be Solved by the Invention] In the conventional elevator door control device as described above,
When the control circuit of the inverter (20) malfunctions or is damaged, the base of the inverter (20) is forcibly shut off as described above from the viewpoint of ensuring safety. Therefore, if the abnormality detection holding circuit operates during the closing operation of the elevator door (1), the elevator door (1) may run out of control. This will be described with reference to the drawings.

Fig. 13 is a speed pattern diagram showing the door speed during the closing operation of the elevator door, and Fig. 14 shows the door speed when the elevator door is free running due to an overcurrent of the motor during the closing operation of the elevator door. It is a speed pattern figure shown.

For example, when the control circuit of the inverter (20) is operating normally, the door speed of the elevator door (1) is 13th.
As shown in the figure, 0->A->B->C-> D changes appropriately from the door open position to the door closed position according to the door position. However, if an abnormality occurs in the control circuit of the inverter (20), the electric motor current becomes an overcurrent, and the abnormality detection holding circuit operates near the maximum door speed, the door speed of the elevator door (1) is As shown in Fig. 14, the inertia energy held by the door itself causes 0 → A → B → E, and the vehicle runs on its own without proper deceleration braking, and the stopper (14a) at the end of the door closes at a fairly high speed. Was colliding with. Therefore, in such a case, a passenger may be caught between the elevator door (1) and the doorpost, and there is a problem particularly in the case of a heavy elevator door (1). Therefore, a more safe elevator door control device has been desired.

In addition, in the conventional elevator door control device, when the control circuit of the inverter (20) malfunctions or is damaged, the base of the inverter (20) is shut off and the microcomputer (40) is stopped. It was being done. Therefore, even if an abnormal signal is generated due to mere noise or the like, the operation control means such as the microcomputer (40) is stopped each time, and it is necessary to perform the recovery process to restart. For this reason, there is a risk that passengers will be in a canned state in the elevator car, and there has been a demand for an elevator door control device that can avoid these problems.

Therefore, the present invention can perform normal opening / closing control of the elevator door without continuing the base shutoff of the inverter even when an abnormality occurs in the control circuit of the inverter, and at the same time, the control of the elevator door that is not in the stopped state can be performed. It is an object to provide a control device.

[Means for Solving the Problem] An elevator door control device according to the present invention controls an inverter (20) for controlling driving of an electric motor (10) for opening and closing the elevator door (1), and the inverter (20). Microcomputer as arithmetic and control means (40)
And an abnormality detection holding means for detecting and holding an abnormality in the control circuit of the inverter (20), and a current for cutting off the electric current of the electric motor by the inverter (20) according to the abnormality detection signal from the abnormality detection holding means. It is provided with a shutoff means and a restart means for restarting the inverter (20) after confirming the abnormal holding state by the abnormality detecting and holding means after a lapse of a predetermined time and then restarting the inverter (20).

[Operation] In the present invention, when an abnormality occurs in the control circuit of the inverter (20) that drives the electric motor (10), the abnormality detection holding means detects the abnormality, and the current cut-off means functions to operate the inverter ( Although the electric motor current is cut off by 20), the abnormal holding state by the abnormal detecting and holding means is canceled after confirmation after a predetermined time has passed, and the inverter (20) is restarted. Even if a circuit error occurs, the drive control of the electric motor (10) is performed without continuing the base shutoff of the inverter (20) to maintain the proper opening / closing operation of the elevator door (1) and restart it. Microcomputer as arithmetic control means by (40)
Will never stop.

[Examples] Examples of the present invention will be described below.

FIG. 1 is a circuit diagram showing an example of a circuit configured by a microcomputer as an arithmetic control unit in an inverter control circuit of an elevator door control apparatus according to an embodiment of the present invention, and FIG. 2 is an embodiment of the present invention. It is a circuit diagram which shows the example of an abnormality detection holding circuit used for the control apparatus of an elevator door. Further, the conventional techniques shown in FIGS. 7, 8 and 10 are common to the embodiments of the present invention. In the figure, the same reference numerals and symbols as those of the above-mentioned conventional example indicate the same or corresponding components as those of the above-mentioned conventional example. Since the operating principle of the inverter (20) and the control circuit of the inverter (20) of this embodiment have been described in detail in the above-mentioned conventional example, their explanation is omitted here.

In FIG. 1, the input interface (46) of the microcomputer (40) as the arithmetic control means receives OCR ^* input and WDOUT ^* input as an example of abnormal input.
An abnormal reset output signal (ALARM ^* RESET) is output from the output interface (47). Others are the same as the conventional example. Then, in the microcomputer (40) including the hardware having such a configuration, when an abnormality occurs in the control circuit of the inverter (20), a predetermined interrupt program is executed.

In Fig. 2, (60) is ALARM ^* RESET and power-on RE
It is an OR gate that takes the logical sum of SET. And this OR
The output of the gate (60) is the flip-flops (55), (5
8) Input to reset input as low active. The output of the comparator (53) OCR ^* and the watchdog counter (5
0) output WDOUT ^* is the microcomputer (40)
Output to the input interface (46) of
Various ALARM signals are also output.

The elevator door control device according to this embodiment includes the microcomputer (40) and the abnormality detection holding circuit having the above-described configuration, and performs the following operation. Note that, here, as an abnormality of the control circuit of the inverter (20), an operation when the electric motor current becomes an overcurrent will be described.

When an electric motor overcurrent occurs, the comparator (53) operates and the abnormality holding flip-flop (55) is held as described above. The held signal outputs the base cutoff signal BCUT of the inverter (20) via the OR gates (56) and (59). Then, by inputting this BCUT signal to the gate circuit (not shown) of the inverter (20), the inverter (20) is cut off and the electric motor current is stopped. At the same time that the base cutoff signal BCUT is output, a microcomputer (4
The ΣALARM signal is output to the interrupt control unit (44) of 0). When the ΣALARM signal is taken into the microcomputer (40) via the interrupt control unit (44), the microcomputer (40) executes an interrupt program as shown in FIG. 3 by software processing.

FIG. 3 is a flowchart showing an example of an interrupt program executed by the microcomputer when an abnormality occurs in the elevator door control apparatus according to the embodiment of the present invention.

In the figure, first, in step S11, the presence or absence of an alarm signal is determined. That is, it is determined whether or not there is an abnormal input and there is an input for interrupt processing. If there is no abnormal condition (alarm signal is “none”), step
In S21, the interrupt completion process is performed, the interrupt process is not executed, and the process directly returns to the main routine.

On the other hand, in the abnormal state (when the alarm signal is "Yes"),
In step S12, the BCUT1 output for shutting off the base of the inverter (20) is output from the CPU (41) via the output interface (47). This allows the inverter (2
0) is temporarily cut off. In step S13, ALAR
The content of the error is judged from the M-1 and ALARM-N signals, and the error code is displayed on the error indicator (48). Then, in step S14, based on the occurrence of the abnormality, the microcomputer (40)
Output and the contents of the internal predetermined RAM are initialized.
After this, after a predetermined time elapses in step S15, step S15
Proceed to 16 and check whether the abnormal inputs OCR ^* , WDOUT ^*, etc. are input even after the above base shutoff and initialization. For example, if the overcurrent input continues to be input even after the base is shut off, each switching element of the inverter (20) may be damaged, so restarting is abandoned, the process proceeds to step S20, and the elevator door ( The stop processing of 1) and the stop processing of the microcomputer (40) are performed, and the program processing by the microcomputer (40) is completed. On the other hand, in step S16, abnormal input OCR ^* , W
If DOUT ^*, etc. are not input after the base is shut off and initialized, the error reset signal (ALA
RM ^* RESET) is input from the output interface (47) of the microcomputer (40) to the flip-flops (55) and (58) for abnormal latch via the OR gate (60). As a result, the restart process of the electric motor (10) is performed in step S18, the base cutoff of the inverter (20) is released in step S19, and this series of interrupt processes is completed. Then, the process returns to the main routine again, and the normal speed control calculation and the vector control calculation program are executed in the main routine.

Here, a time chart of each signal when the above-mentioned interrupt program is executed by the microcomputer (40) as the arithmetic control means when an abnormality occurs will be described.

FIG. 4 is a time chart showing a state in which the motor current continues to flow even if the motor overcurrent occurs and the base is shut off.
FIG. 5 is a time chart showing a state in which a motor overcurrent is generated due to noise or the like and the restart sequence is activated.

FIG. 4 shows a case where the abnormal state continues even after the abnormal input is checked in step S16 of FIG. That is, although the motor current Iuvw is abnormal, the output OCR of the comparator (53) is inverted, the base cutoff signal BCUT is output, and the inverter (20) is in the cutoff state, the motor overcurrent is It continues to flow.
Therefore, in this case, as described in the description of FIG. 3, there is a strong possibility that the inverter element or the like is damaged, the restart is abandoned, the process proceeds to step S20, and the elevator door (1) Stop processing and microcomputer (4
0) stop processing is performed and this microcomputer (4
The program processing by 0) ends.

Further, FIG. 5 shows a case where the abnormal state is resolved when the abnormal input is checked in step S16 of FIG. 3, and the inverter (20) is restarted by outputting the abnormal reset signal. . That is, when an abnormality occurs in the electric motor current Iuvw, the output OCR of the comparator (53) is inverted, and the base cutoff signal BCUT is output, the inverter (20) is in the cutoff state, and the electric motor current Iuvw becomes 0, After this,
When the abnormal input is checked after the elapse of the predetermined time t0, the abnormal condition has been resolved and the abnormal reset signal ALARM
^* By outputting RESET, the output OCR of the comparator (53) is inverted again, the base cutoff signal BCUT is stopped, and the inverter (20) is restarted. That is, after a lapse of a predetermined time t0 after the abnormality is detected, the microcomputer (40) confirms the abnormality again, and if the abnormal state is resolved, the abnormality holding flip-flop (55). , (58) are reset and the base cutoff of the inverter (20) is released. As a result, the electric motor current Iuvw normally flows. Therefore, in this case, as described in the description of FIG. 3 above, the operations of step S17 to step S19 are performed, the base cutoff of the inverter (20) is released, and the normal speed control calculation by the main routine is performed again. Alternatively, the vector control calculation program is executed. It should be noted that the elimination of the abnormal state here means, for example, when noise or the like is superimposed on the abnormality detection holding circuit and an abnormal interrupt is erroneously generated, or the CPU (41) is out of control due to the noise or the like and the watchdog counter ( It means that the abnormal condition that occurs when (50) malfunctions is resolved.

As described above, the elevator door control apparatus according to this embodiment performs the restart sequence control after the abnormal reset.

Next, the door speed of the elevator door when the restart sequence is entered in the elevator door control device of this embodiment will be described. FIG. 6 is a speed pattern diagram showing the door speed of the elevator door when the restart sequence is entered in the elevator door control apparatus according to the embodiment of the present invention.

As shown in FIG. 6, for example, when an abnormality occurs in the control circuit of the inverter (20), the electric motor current becomes an overcurrent, and the abnormality detection holding circuit operates at point B near the maximum door speed, , The door speed of the elevator door (1) is B
Free running from point F to point F, after which the inverter door (20) is released from the base shutoff, the elevator door (1) is rapidly decelerated, and the elevator door (1) runs at low speed until the stopper (14a) on the door closing side reaches F. The closing operation is completed as → G → H → J. The reason why the vehicle is decelerated rapidly until it is in the door-closed state after restarting to operate at low speed is that the position of the elevator door (1) at the time of occurrence of an abnormality is uncertain. After that, normal operation is continued.

By adopting the restart sequence after the abnormal reset having the above configuration in the elevator door control device of this embodiment, even if the abnormality detection holding circuit operates during the closing operation of the elevator door (1), this , In the abnormal state that occurs when noise etc. is simply superimposed on the abnormality detection holding circuit and the abnormal interrupt is generated by mistake, or when the CPU (41) runs away due to noise etc. and the watchdog counter (50) malfunctions. If so, the inverter (20) is restarted,
Since the predetermined opening / closing control of the elevator door (1) is executed, the risk of the elevator door (1) running out of control as in the conventional case is reduced. Therefore, passengers are not allowed to use the elevator door (1)
It is possible to avoid the risk of being caught between the doorpost and the doorpost, and it is possible to control the elevator door with higher safety. Further, the restart of the inverter (20) allows the microcomputer (40) to continue normal program processing without stopping.

As described above, the elevator door control device of this embodiment includes the inverter (20) for controlling the drive of the electric motor (10) for opening and closing the elevator door (1) and the microcomputer (for controlling the inverter (20) ( 40), an abnormality detection holding means comprising the abnormality detection holding circuit shown in FIG. 2 for detecting and holding an abnormality of the control circuit of the inverter (20), and an abnormality detection signal from the abnormality detection holding means. , The current cutoff means of steps S11 and S12 in FIG. 3 for shutting off the motor current by the inverter (20) and the abnormality holding state by the abnormality detection and holding means are canceled after a predetermined time has passed and the inverter (20 ) Is restarted, the restart means of steps S15 to S19 of FIG. 3 is provided.

That is, in this embodiment, when the control circuit of the inverter (20) malfunctions, is damaged, or the like, as in the conventional example,
In addition to forcibly shutting off the base of the inverter (20), the microcomputer (40) confirms the abnormality again, and in the special case where each switching element of the inverter (20) is damaged and cannot be restarted. Except for this, the inverter (20) is disconnected from the base and restarted to control the opening and closing of the elevator door (1).

Therefore, the runaway of the elevator door (1) at the time of occurrence of an abnormality is reduced, and the probability that the microcomputer (40) as the arithmetic and control unit is stopped is also extremely reduced. Therefore, the passenger is not caught between the elevator door (1) and the doorpost, and the passenger is less likely to be canned in the elevator car. As a result, the elevator door is highly safe. As a result, the highly reliable opening / closing control of the elevator door can be realized.

By the way, in the above-mentioned embodiment, the control device of the elevator door which performs the base cutoff of the inverter (20) through the microcomputer (40) as the arithmetic control means when the abnormality of the control circuit of the inverter (20) is detected will be described. However, if you have dedicated hardware as an abnormality detection means, and this abnormality detection means detects an abnormality,
Directly cut off the base circuit etc. of the inverter (20) to cut off the electric motor current, and at the same time, cause the microcomputer (40) to execute an interrupt process and send a restart signal to the base circuit etc. of the inverter (20). It may be output and the inverter (20) may be restarted.

Also, by causing the above microcomputer (40) to execute the interrupt processing, the microcomputer (40) outputs the base cutoff signal of the inverter (20) again, and the cutoff system of the inverter (20) is duplicated. You may. If such a configuration is adopted, the elevator door control device can be made even more safe.

Further, in the above embodiment, an elevator for resetting the inverter (20) by releasing the base cutoff of the inverter (20) by inputting the abnormality holding reset signal to the abnormality detection holding circuit configured by other than the microcomputer as shown in FIG. Although the door control device has been described, both the abnormality holding signal and the abnormality holding reset signal are input to the microcomputer (40) as the arithmetic control unit, and as described above via the program processing by the software of the microcomputer (40). The inverter may be configured to be shut off and restarted.

[Advantages of the Invention] As described above, the elevator door control device of the present invention includes the inverter, the arithmetic control unit, the abnormality detection holding unit, the current cutoff unit, and the restart unit, and the control circuit of the inverter that drives the electric motor. If an abnormality occurs, the abnormality detection holding means detects it and shuts off the motor current by the inverter by the function of the current cutoff means, but confirms the abnormality holding state by the abnormality detection holding means after a predetermined time has elapsed. Even if an abnormality occurs in the control circuit of the inverter by releasing it on the upper side and restarting the inverter, the drive control of the electric motor is performed without continuing the base cutoff of the inverter as much as possible, and the elevator door is properly operated. Since the opening / closing operation can be maintained, runaway of the elevator door in the event of an abnormality is reduced, safety is improved, and the arithmetic control means is stopped by restarting. Therefore, the probability that the arithmetic control unit is stopped is significantly reduced, and highly reliable opening / closing control of the elevator door can be realized.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit example in which an inverter control circuit of an elevator door control apparatus according to an embodiment of the present invention is configured by a microcomputer, and FIG. 2 is an elevator door control according to an embodiment of the present invention. FIG. 3 is a circuit diagram showing an example of an abnormality detection holding circuit used in the apparatus, FIG. 3 is a flowchart showing an example of an interrupt program executed by a microcomputer when an abnormality occurs in the elevator door control apparatus according to one embodiment of the present invention, Fig. 4 is a time chart showing the state in which the motor current continues to flow even if the base is cut off due to the motor overcurrent, and Fig. 5 shows the state in which the motor overcurrent is generated due to noise etc. and the restart sequence is activated. The time chart shown in FIG. 6 is an elevator when a restart sequence is entered in the elevator door control apparatus according to the embodiment of the present invention. FIG. 7 is a speed pattern diagram showing the door speed of the data door, FIG. 7 is a front view showing the mechanical structure of the elevator door to which the embodiment of the present invention and the conventional elevator door control device are applied, and FIG. FIG. 9 is a block diagram showing a control circuit of an inverter, and FIG. 9 is a circuit diagram showing a circuit in which an inverter control circuit of a conventional elevator door control device is configured by a microcomputer.
Figure is a circuit diagram showing an abnormality detection holding circuit used in a conventional elevator door control device, FIG. 11 is a flowchart showing an interrupt program executed by a microcomputer when an abnormality occurs in the conventional elevator door control device, FIG. 12 is a time chart showing a state in which the motor overcurrent occurs and the base is shut off, FIG. 13 is a speed pattern diagram showing a door speed at the time of closing operation of the elevator door, and FIG. 14 is a time pattern at the time of closing operation of the elevator door. It is a speed pattern figure which shows the door speed in the state where the electric motor overcurrent generate | occur | produced on the way and the elevator door was free-running. In the figure, 1: Elevator door, 9: Drive device 10: Electric motor, 15: Door control device 18: Diode bridge 20: Inverter, 21: PWM part 32: DC CT, 33: Current amplifier part 40: Microcomputer 52: Three Phase full-wave rectifier circuit 53: Comparator 55,58: Flip-flop 56,59,60: OR gate 57: One-shot circuit. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Kodera 1 Hishimachi, Inazawa City, Aichi Mitsubishi Electric Engineering Co., Ltd. Inazawa Plant (56) References JP 63-7136 (JP, A)

Claims (1)

[Claims] 1. An inverter for controlling the drive of an electric motor for opening and closing an elevator door, an arithmetic control unit for controlling the inverter, an abnormality detection holding unit for detecting an abnormality in the inverter control and holding it, and the abnormality. In response to an abnormality detection signal from the detection holding means, a current cutoff means for cutting off the motor control current by the inverter, and an abnormality detection state after reconfirming the abnormality holding state by the abnormality detection holding means after a predetermined time has elapsed, the abnormality is detected. And a restarting means for restarting the inverter when the abnormality is not retained.