JP2002362848A - Elevator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and surely executing a rescue operation by a residual power inverter even if either of a first or a second power inverter feeding a power to a multi-winding motor comprising a hoisting machine breaks down. SOLUTION: The hoisting machine 6 comprises a double-winding motor having a first and a second winding and in a general driving, a power from respective inverters 3a and 3b is fed to the respective windings. When the inverter 3a breaks down by overcurrent, contactors 10a and 10c are turned off and a contactor 10e as a short-circuit means is turned on. The both windings are thus fed with the power from the inverter 3b so as to perform the rescue operation without causing any eccentric vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control apparatus, and more particularly to a control system for a large-capacity elevator in which a hoist constituted by a multi-winding motor is driven by a plurality of power converters. The present invention relates to an elevator control device having a function of performing rescue operation when a power converter fails.

[0002]

2. Description of the Related Art In recent years, buildings have become higher and higher, and ultra-high-speed elevators for mass transportation of passengers and double-deck elevators which are connected to upper and lower cages and can transport two passengers at a time have been developed. Although gradually used, a multi-winding motor having a large capacity is used as a motor for driving this type of elevator. In an elevator control device using such a multi-winding motor, a configuration in which a plurality of power converters including an inverter device and a converter device are connected to drive a motor is employed.

FIG. 9 is a configuration diagram of such a conventional elevator control device. In this figure, converters 2a and 2b are connected to a power source 1 in parallel via contactors 10c and 10d. Inverter 3a to converter 2a
Are connected, and a capacitor 4a is connected between the converter 2a and the inverter 3a (referred to as an A system). An inverter 3b is connected to the converter 2b, and a capacitor is connected between the converter 2b and the inverter 3b. 4b are connected (these are B systems). The converter 2a and the inverter 3a constitute a first power converter, and the converter 2b and the inverter 3b constitute a second power converter.

If the motor of the hoisting machine 6 is, for example, a two-winding motor, an inverter 3a is connected to the first winding via a contactor 10a, and an inverter 3b is connected to the second winding via a contactor 10b. Connected.

[0005] The main rope 9 is hung on the hoist 6 so that the car 8 can be moved up and down. The car 8 and the counterweight 7 are connected by a compensating rope 13 via a compensive 14.

Current detectors 12c, 12d are provided on the input side of converters 2a, 2b, and inverters 3a, 3b
Are provided with current detectors 12a and 12b. The current detectors 12e and 12f are provided on one end side of the capacitors 4a and 4b. The detection signals of these current detectors 12a to 12f are input to the control means 5a, 5b.

The control means 5a controls the inverters 3a and 3b, and the control means 5b controls the converters 2a and 2b. Control means 5a and control means 5b
Are connected by communication means 11 so that information can be exchanged with each other.

In the above configuration, for example, when the inverter 3a fails, the operation of the elevator is stopped. Then, the contactor 10c and the contactor 10a
To disconnect the first power converter, ie, the converter 2a and the inverter 3a from the operation system,
By supplying power to the second winding by the second power converter, that is, the converter 2b and the inverter 3b, a rescue operation for driving the hoisting machine 6 to rescue the passengers is performed.

[0009]

Here, in the two-winding motor constituting the hoisting machine 6, as shown in FIG. 10, a sheave 6c is arranged at the center of two windings 6a and 6b. It has a configuration. These two windings 6a and 6b generate driving force similarly to the independent motors, and drive the sheave 6c. Therefore, when the hoisting machine 6 is started by energizing only one of the windings, the hoisting machine 6 is subject to vibration and mechanical failures such as damage to the bearings provided on the windings 6a and 6b are caused. May occur. In such a case, the rescue operation can no longer be continued, resulting in the passenger being locked in the car. Further, if the elevator mechanism is damaged in this way, it takes a long time to recover the elevator mechanism, and the operation cannot be restarted for a long time. This has a great effect particularly on the elevator system of a skyscraper.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is directed to any one of the first and second power converters for supplying power to a multi-winding motor constituting a hoist. It is an object of the present invention to provide an elevator control device that can perform a rescue operation safely and reliably by using the remaining power converters even if a failure occurs.

[0011]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 is a multi-purpose device in which first and second windings are provided on one side and the other side of a sheave, respectively. An elevator control device comprising: a hoist configured by a winding motor; and first and second power converters that respectively supply power to the first and second windings. Short-circuiting means for short-circuiting the output side of the second power converter; and operating one of the first and second power converters when a failure occurs in one of the power converters. Control means for causing the hoist to perform a rescue operation by stopping and causing the short-circuit means to perform a short-circuit operation, and supplying power from the other power converter to both the first and second windings; , Is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the input side and the output side of the first and second power converters are respectively connected to a power source and a power source via an input side contactor and an output side contactor. The control means is connected to the first and second windings, and includes an off-operation answer indicating that the input-side contactor and the output-side contactor connected to one of the faulty-side power converters have surely turned off. The short circuit occurs only when a back signal is input and an ON operation answer back signal indicating that the input contactor and the output contactor connected to the other power converter on the sound side are securely turned on is input. 2. The elevator control device according to claim 1, wherein the short-circuit operation is performed by the means.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the control means causes the other power converter to supply power to both the first and second windings. When the hoist performs a rescue operation, the acceleration and the deceleration are set to predetermined values smaller than those in the normal operation.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the control means inputs a detected load value in the car, and if the detected load value is within a set range, sets the acceleration and deceleration to the second range. When the load detection value is out of the set range, the second set value has a value smaller than the first set value.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, when the load detection value is out of a set range, the control means sets the acceleration and the deceleration to the second set value. The execution of the rescue operation is stopped.

[0016]

Embodiments of the present invention will be described below. However, the same components as those shown in FIG. 9 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a configuration diagram of a first embodiment of the present invention. FIG. 1 differs from FIG. 9 in that a contactor 10e is provided on the input side of the hoisting machine 6, that is, on the output side of the inverters 3a and 3b, as a short-circuit means for short-circuiting between the first and second windings. That is the point. This contactor 1
By turning on 0e, power can be supplied from either one of the inverters to both windings.

For example, of the two systems of the A system by the first power converter and the B system by the second power converter,
When the main circuit of the B system is connected to both windings by short-circuiting the winding of the motor of the hoisting machine 6, the contactors 10c and 10
After turning off a and disconnecting the A system, the contactor 10e may be turned on, and the contactors 10d and 10b may be turned on. Conversely, when the main circuit of the A system is short-circuited to the motor of the hoisting machine 6 and connected to both windings,
After disconnecting the B system by turning off the contactors 10d and 10b, the contactor 10e may be turned on, and the contactors 10c and 10a may be turned on. In this embodiment, basically, the control unit 5a controls the entire elevator, and the control unit 5b controls the converters 2a and 2b in accordance with the instruction of the control unit 5a. The ON / OFF operation of the contactors 10a to 10d and the contactor 10e is controlled by the control means 5a.

Next, the operation of FIG. 1 will be described with reference to the flowchart of FIG. However, in the following example, the inverter 3
The rescue operation in the case where the elevator stops due to a failure due to overcurrent will be described.

First, the process starts and proceeds to step 201, in which operation control for raising or lowering the elevator is performed. Next, the routine proceeds to step 202, where an abnormality in the main circuit is confirmed.
If no abnormality is confirmed, the process returns to step 201, and the operation of the elevator is continued. If an abnormality is detected, the process proceeds to step 203. In step 203, the operation of the elevator is stopped. Proceeding to step 204, the main circuit in which the abnormality has occurred is confirmed. Here, it is assumed that the inverter 3a has an overcurrent abnormality as described above. Step 20
Proceeding to 5, the inverter 3a, which is the abnormal main circuit, is disconnected. That is, the control means 5 a
By turning off a and 10c, the main circuit of the A system is disconnected from the power supply 1 and the hoisting machine 6.

Next, the routine proceeds to step 206, where normal inverters are connected. That is, the control means 5a turns on the contactors 10b and 10d, and supplies the power
b, and the inverter 3b, which is a normal inverter, is connected to the motor of the hoisting machine 6. Then, proceeding to step 207, the control means 5a turns on the contactor 10e to short-circuit the first and second windings of the hoist 6 so that the output of the inverter 2b can be supplied to both windings.
Thereafter, the process proceeds to step 208, where the elevator is started to perform rescue operation, the car 8 is landed on the rescue floor to rescue the passengers in the car 8, and all operations are terminated.

As described above, in the first embodiment, the output of the normal inverter is supplied to each winding of the multi-winding motor, so that even if a failure occurs in any one of the inverters, it is possible to stably output the output. The motor can be rotated. Therefore, it is possible to prevent the mechanism of the hoisting machine 6 from failing, and it is possible to safely and accurately perform the elevator rescue operation when the main circuit fails.

FIG. 3 is a configuration diagram of a second embodiment of the present invention. FIG. 3 differs from FIG.
The control means 5a inputs an answerback signal indicating that the contact has been turned on or off reliably from 10e.

Next, the operation of FIG. 3 will be described with reference to the flowchart of FIG. First, start and step 401
To control the operation of raising or lowering the elevator.
Next, the routine proceeds to step 402, where an abnormality in the main circuit is confirmed. If no abnormality is confirmed, return to step 401,
Continue operating the elevator. When an abnormality is detected, the process proceeds to step 403. In step 403, the operation of the elevator is stopped. Proceeding to step 404, the main circuit in which the abnormality has occurred is confirmed. Here, as described above, it is assumed that the inverter 3a has an overcurrent abnormality.

In step 405, the inverter 3a, which is an abnormal main circuit, is disconnected. That is, the control means 5a disconnects the main circuit of the A system from the power supply 1 and the hoist 6 by turning off the contactors 10a and 10c.
In step 406, it is checked whether or not an off-operation answerback signal indicating that the contactors 10a and 10c have been turned off without fail has been input. If the confirmation cannot be performed, the contactor contacts may be welded, and if the control is continued, the device may be further damaged. Therefore, the operation is terminated without performing the rescue operation.

At step 407, a normal inverter is connected. That is, the control means 5 a
b and 10d are turned on, the converter 2b is connected to the power supply 1, and the inverter 3b, which is a normal inverter, is connected to the motor of the hoisting machine 6. In step 408, it is checked whether or not an ON operation answer back signal indicating that the contactors 10b and 10d have been turned on has been input. If it can be confirmed, the process proceeds to step 409. If no confirmation can be made, the operation is ended without performing the rescue operation because the winding of the hoisting machine 6 cannot be energized.

In step 409, the control means 5a turns on the contactor 10e to short-circuit the first and second windings of the hoist 6 so that the output of the inverter 2b can be supplied to both windings. In step 410, contactor 1
It is checked whether or not an ON operation answerback signal indicating that 0e has been reliably turned on has been input. If it can be checked, the process proceeds to step 411. If the confirmation is not successful, power cannot be supplied from the inverter 3b to the first winding A, so that the operation ends without performing the rescue operation.

Thereafter, the process proceeds to step 411, where the elevator is started to perform rescue operation, the car 8 is landed on the rescue floor to rescue the passengers in the car 8, and all operations are completed.

As described above, according to the second embodiment, using the answer back signal from each contactor, there is an abnormality in the contactor, the main circuit cannot be disconnected or connected, and the electric power is not supplied to the motor. The rescue operation is stopped when it cannot be supplied or when there is a possibility that the device may be damaged if the power is supplied. Therefore, according to the second embodiment, in addition to the effect of the first embodiment, an effect that secondary device damage can be prevented can be obtained.

When the motor is driven by short-circuiting the windings, if the same control is performed as in the normal operation, the load on the inverter becomes larger than that in the normal operation. For example, if speed control is performed in the same manner as during normal operation, the output current of the inverter becomes about twice as simple as the case may be. Then, for example, during the ascent operation of the elevator, the motor torque is generally represented by the following equations (1) to (4).

(Equation 1) As is clear from the above equation, during the operation of the elevator, all the values other than the acceleration and the deceleration are fixed values. Therefore, if the acceleration or the deceleration is reduced, the motor torque and the motor current can be suppressed.

FIG. 5 shows an example of an operation pattern for performing a rescue operation. A solid line indicates an operation pattern during normal operation, and a broken line indicates an operation pattern during rescue operation. Although the powering mode and the regenerative mode are different, the case where the load capacity is the maximum will be described. In the regenerative mode at the time of the rescue operation, there are a pattern in which the speed is rapidly decelerated as in the power running mode and a pattern in which the speed is decelerated more slowly, and either one is selected. As shown in the equation (2) for the ascending acceleration torque, the ascending operation is in the power running mode, and the steady ascending torque is positive. Can be reduced. Also,
Since the steady deceleration torque is negative as shown in (Equation 3), there is no problem even if the deceleration is the same as in the normal operation. Conversely, in the case of the regenerative mode, the required torque can be suppressed by setting the acceleration in the same direction as in the normal operation and making the deceleration smaller than that in the normal operation.

As described above, when the rescue operation is performed, the acceleration or deceleration is made smaller than that in the normal operation, so that the current at the time of acceleration / deceleration can be suppressed and the load on the inverter can be reduced. Can be performed reliably.

FIG. 6 is a block diagram of a third embodiment of the present invention. FIG. 6 differs from FIG. 1 in that a load detector 15 is attached to the car 8 and the load detection signal is input to the control means 5a. Generally, the load on the inverter varies depending on the number of passengers in the car 8 when the elevator fails. In the case of a lift-type elevator, the closer the mass of the counterweight 7 and the mass of the load in the car 8 are, the smaller the required torque is, so that the load on the inverter is reduced. On the other hand, the inverter needs the maximum output when performing the ascending operation in a full state or when performing the descending operation without any passengers. The situation differs depending on whether the vehicle is in the power running mode or the regenerative mode.

Next, the operation of FIG. 6 will be described with reference to the flowchart of FIG. First, start and step 701
To control the operation of raising or lowering the elevator.
Next, the routine proceeds to step 702, where an abnormality in the main circuit is confirmed. If no abnormality is confirmed, return to step 701,
Continue operating the elevator. If an abnormality is detected, the process proceeds to step 703. In step 703, the operation of the elevator is stopped. Proceeding to step 704, the main circuit in which the abnormality has occurred is confirmed. Here, as described above, it is assumed that the inverter 3a has an overcurrent abnormality. Proceeding to step 705, the inverter 3a, which is the abnormal main circuit, is disconnected. That is, the control means 5 a
By turning off 0a and 10c, the main circuit of the A system is disconnected from the power supply 1 and the hoisting machine 6.

Next, the routine proceeds to step 706, where normal inverters are connected. That is, the control means 5a turns on the contactors 10b and 10d, and supplies the power
b, and the inverter 3b, which is a normal inverter, is connected to the motor of the hoisting machine 6. Then, proceeding to step 707, the control means 5a turns on the contactor 10e to short-circuit the first and second windings of the hoisting machine 6 so that the output of the inverter 2b can be supplied to both windings.

In step 708, the load in the car 8 is detected by the load detector 15, and in step 709, it is determined whether the detected value W is within the range between the upper limit value WH and the lower limit value WL. . If it is within the range, the process proceeds to step 710, and the acceleration α is operated at α1 and the deceleration β is operated at β1, and if it is out of the range, the process proceeds to step 711 and the acceleration α is operated at α2 and the deceleration β is operated at β2. If the acceleration and deceleration during normal operation are αn and βn, it is assumed that there is a relationship of αn ≧ α1> α2 and βn ≧ β1> β2.

Thereafter, the process proceeds to step 712, where the elevator is started to perform rescue operation, the car 8 is landed on the rescue floor to rescue the passengers in the car 8, and all operations are completed.

As described above, in the third embodiment, the acceleration / deceleration is determined according to the load state during the rescue operation. Therefore, when driving at a large acceleration, the driver can move to the rescue point more quickly and eliminate the anxiety of the passengers, while, when it is judged that the load is large and acceleration / deceleration cannot be increased, the current during acceleration / deceleration is suppressed However, the rescue operation can be reliably performed by reducing the load on the inverter.

Next, a fourth embodiment of the present invention will be described. The configuration of this embodiment is the same as that of the third embodiment shown in FIG. The difference from the third embodiment is that when the detected value of the load in the car is out of the predetermined range, the rescue operation is stopped on the assumption that the hoisting machine 6 cannot be driven even by the maximum output of the inverter. The point is to try to do it.

FIG. 8 shows a flowchart of the fourth embodiment. However, steps 801 to 809 are the same as those in FIG.
Steps 701 to 709 in FIG. In the determination of step 809, WL <W <
If the formula of WH is satisfied, the routine proceeds to step 810, where the elevator is started to perform rescue operation, the car 8 is landed on the rescue floor, the passengers in the car 8 are rescued, and all operations are completed. On the other hand, if the expression of WL <W <WH does not hold, all operations are terminated without performing rescue operation.

As described above, according to the fourth embodiment, the rescue operation is stopped when it is determined that the car cannot be driven even if the load in the car has the maximum output of the inverter. The occurrence of subsequent damage can be prevented.

In each of the above embodiments, the hoist 6
Has been described as being a two-winding motor (in this case, the number of the first and second windings is 1 in each case). It is applicable to motors (in this case, N = 2, 4, 6
, Etc., and the numbers of the first and second windings are each N / 2).

[0043]

As described above, according to the present invention, one of the first and second power converters for supplying power to the multi-winding motor constituting the hoisting machine is provided. Even if a failure occurs, the rescue operation can be executed safely and reliably by the remaining power converters.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of FIG. 1;

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of FIG. 3;

FIG. 5 is a characteristic diagram showing an operation pattern at the time of a rescue operation in each embodiment of the present invention.

FIG. 6 is a configuration diagram of a third embodiment of the present invention.

FIG. 7 is a flowchart for explaining the operation of FIG. 6;

FIG. 8 is a flowchart for explaining the operation of the fourth embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional elevator control device.

FIGS. 10A and 10B are explanatory diagrams showing a two-winding motor, a car driven by the two-winding motor, and a counterweight, wherein FIG. 10A is a front view and FIG. 10B is a side view.

[Explanation of symbols]

 Reference Signs List 1 power supply 2a converter (first power converter) 3a inverter (first power converter) 2b converter (second power converter) 3b inverter (second power converter) 4a, 4b capacitor 5a, 5b control Means 6 Hoisting machine 6a First winding 6b Second winding 6c Sheave 7 Counterweight 8 Basket 9 Main rope 10a to 10d Contactor 10e Contactor (short circuit means) 11 Communication means 12a to 12f Current detector 13 Compensation rope 14 Compensive 15 load detector

Claims (5)

[Claims] 1. A first and a second side of a sheave, respectively.
And a hoist comprising a multi-winding motor provided with a second winding and a first winding for supplying power to the first and second windings, respectively.
And a second power converter, comprising: a short-circuit means for short-circuiting the output sides of the first and second power converters; and a short-circuit means of the first and second power converters. When a failure occurs in one of the power converters, the operation of the one power converter is stopped and the short-circuiting unit is caused to perform a short-circuit operation, and the other power converter performs the short-circuit operation of the first and second windings. Control means for causing the hoist to perform a rescue operation by supplying power to both the elevator and the hoist. 2. An input side and an output side of the first and second power converters are connected to a power source and the first and second windings via an input side contactor and an output side contactor, respectively. The control means inputs an off-operation answerback signal indicating that the input-side contactor and the output-side contactor connected to one of the faulty-side power converters have been reliably turned off,
Only when the input-side contactor and the output-side contactor connected to the other power converter on the healthy side are turned on reliably, the short-circuit operation is performed on the short-circuit means. The elevator control device according to claim 1, wherein 3. The control means according to claim 2, wherein said control means controls the acceleration and deceleration when the hoist performs a rescue operation by supplying power from the other power converter to both the first and second windings. The elevator control device according to claim 1 or 2, wherein the speed is set to a predetermined value smaller than that during normal operation. 4. The control means inputs a detected load value in the car and sets the acceleration and deceleration to a first set value if the detected load value is within a set range. The elevator control device according to claim 3, wherein, if present, a second set value having a value smaller than the first set value is set. 5. The control means stops executing the rescue operation instead of setting the acceleration and deceleration to the second set values when the load detection value is out of the set range. The elevator control device according to claim 4, wherein: