JP2007153504A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator control device superior in transport efficiency without restricting operation of a power source regenerative elevator, by preventing an overload of a regenerative electric power consumption circuit, by restraining a generation quantity of regenerative electric power, even in an operation mode of continuing in regenerative operation. <P>SOLUTION: This elevator control device has a travel control device 11 controlling power running and the regenerative operation in a switching system in response to a car inside load and the operation direction of an elevator; and has a travel resistance force adjusting means 22 capable of increasing travel resistance force when the elevator travels, a regenerative mode detecting means 12 detecting whether or not the elevator is a regenerative mode on the basis of input of a regenerating mode discriminating signal, and a travel resistance force control part 13 increasing the travel resistance force of the travel resistance force adjusting means 22, by outputting a travel resistance force increasing command when detecting the fact of being in the regenerative mode by the regenerative mode detecting means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elevator control apparatus that has a problem of energy consumption during regenerative operation.

  A conventional elevator control device that performs regenerative operation has been proposed in which a self-generated power capacity and a battery capacity are reduced when the elevator is used for evacuation during a fire (for example, see Patent Document 1).

Here, the elevator has a “slip-type structure” in which a car and a counterweight are connected via a rope in a hoistway. In general, a load half of the rated load is loaded in a car. It comes to be balanced. Further, guide devices such as guide rollers and guide shoes are attached to the car 2 and the counterweight so as to travel along the rails in the hoistway.

  In addition, elevator operation includes power running operation and regenerative operation. For example, the ascending operation at the rated load is a power running operation, and the descending operation is a regenerative operation. Conversely, the ascending operation when there is no load in the car is a regenerative operation, and the descending operation is a power running operation. In the case of regenerative operation, the electric motor that moves the elevator serves as a generator and generates regenerative power.

  In the case of a small capacity elevator, during the regenerative operation of the elevator, the DC bus voltage of the elevator starts to increase due to the regenerative power from the electric motor. A regenerative power consuming circuit in the control device monitors the DC bus voltage, and when the voltage exceeds a reference value, starts energizing the resistance circuit to convert the regenerative power into heat and release it.

  On the other hand, in the case of a large-capacity elevator, the regenerative power processing circuit becomes large, so it is difficult to consume due to resistance in the elevator machine room. is there.

Japanese Patent Laying-Open No. 2005-22799 (first page, FIG. 1)

  However, the prior art has the following problems. When the elevator is actually used for evacuation, when retreating the evacuee from the upper floor to the ground by descending operation, and ascending to the upper evacuation floor with no load in the car for rescue It is assumed that the regenerative operation will be repeated. In such a repetitive operation, the type of elevator that consumes regenerative power with resistance may lead to overload of the regenerative circuit.

  In general, in addition to the capacity of the generator, a regenerative power withstand capability for the regenerative load is defined. In an elevator of a type that returns regenerative power to the power source, when the power source is switched to a private generator, care must be taken so that excessive regenerative power does not return to the generator. As a countermeasure for such a problem, there is a method of shifting the operation timing of the elevator so that the peaks of the regenerative electric power do not overlap, but in some cases, there is a possibility that the transportation efficiency is lowered.

  The present invention has been made to solve the above-described problems. Even in an operation mode in which regenerative operation is continued, an overload of a regenerative power consumption circuit is prevented by suppressing the generation amount of regenerative power, and a power source It is an object of the present invention to obtain an elevator control device excellent in transport efficiency without restricting the operation of a regenerative elevator.

  An elevator control device according to the present invention increases a traveling resistance force during elevator travel in an elevator control device including a travel control unit that switches between power running operation and regenerative operation in accordance with an elevator car load and a driving direction. A regenerative mode detection means for detecting whether or not the elevator is in a regenerative mode based on an input of a regeneration mode determination signal, and a regeneration mode detecting means, and a regenerative mode detecting means. Is detected, a running resistance force control unit that increases the running resistance force of the running resistance force adjusting means by outputting a running resistance force increase command is provided.

  According to the present invention, the regenerative power consumption circuit of the regenerative power consumption circuit is reduced by suppressing the generation amount of the regenerative power even in the operation mode in which the regenerative operation continues by increasing the hoistway loss torque by increasing the traveling resistance force in the regenerative mode. It is possible to obtain an elevator control device that prevents overload and has excellent transport efficiency without restricting the operation of the power regeneration type elevator.

  Hereinafter, preferred embodiments of an elevator control device of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram of an elevator control device according to Embodiment 1 of the present invention, which includes a controller unit 10 and a drive device 20. The controller unit 10 includes, in addition to the conventional travel control unit 11 that performs switching control between power running operation and regenerative operation, regenerative mode detection means 12 that detects whether or not the elevator is in the regenerative mode, and travel resistance force during the regenerative operation. A running resistance control unit 13 that outputs an increase command is further provided.

  On the other hand, in addition to the conventional elevator mechanism 21, the drive device 20 can increase the running resistance during the elevator running according to the running resistance increase command from the running resistance control unit 13. A force adjusting means 22 is further provided.

  Here, “increasing the running resistance” in the present application means increasing the hoistway loss torque by increasing the sliding resistance of the car side guide mechanism with respect to the rail. Furthermore, the “regeneration mode” in the present application means a mode that is detected to determine a period during which the hoistway loss torque is increased.

  Next, the traveling resistance adjusting means 22 in the present application will be described based on the specific examples of FIGS. FIG. 2 is a diagram showing a first specific example of running resistance adjusting means 22 in Embodiment 1 of the present invention. The running resistance adjusting means 22 in FIG. 2 can change the sliding resistance between the guide shoe and the rail by driving the motor.

  FIG. 3 is a diagram showing a second specific example of running resistance adjusting means 22 in Embodiment 1 of the present invention. The running resistance adjusting means 22 in FIG. 3 stores the energy generated in the storage battery by pressing the car-side generator against the rail in the regeneration mode. Performing such power generation equivalently increases the running resistance and increases the hoistway loss.

  FIG. 4 is a diagram showing a third specific example of the running resistance adjusting means 22 in the first embodiment of the present invention. The running resistance adjusting means 22 in FIG. 4 increases the hoistway loss by charging the storage battery by the action of the permanent magnet attached to the car side and the power generation coil attached to the hoistway side. . By switching the switch to ON in the regeneration mode, the running resistance force is equivalently increased and the hoistway loss is increased.

  Next, the regeneration mode detection means 12 in FIG. 1 will be described in detail. The regeneration mode detection means 12 detects whether or not the elevator is in the regeneration mode based on the input of the regeneration mode determination signal. In the first embodiment, a case will be described in which signals relating to the car load and the driving direction are used as the regeneration mode determination signal.

  In FIG. 1, the case where the regeneration mode determination signal is fetched from the outside is illustrated, but signals relating to the car load and the driving direction can also be fetched via the travel control unit 11. Assuming that the car is balanced with a load half the rated load in the car, the regenerative mode detection means 12 determines that the load in the car is the rated load based on the regeneration mode determination signal. If it is lighter than half of the load and the driving direction is increasing, or if the load in the car is heavier than half of the rated load and the driving direction is decreasing, it is determined that the regeneration mode is set.

  Next, when the regenerative mode detection unit 12 detects that the regenerative mode is in effect, the travel resistance control unit 13 outputs a travel resistance force increase command to the travel resistance force adjusting unit 22. Thereby, the running resistance adjusting means 22 increases the running resistance.

  Specifically, for the traveling resistance adjusting means 22 having the configuration of FIG. 2, the traveling resistance control unit 13 increases the hoistway loss by driving the motor according to the traveling resistance increase command. Can do.

  For the traveling resistance adjusting means 22 having the configuration of FIG. 3, the traveling resistance control unit 13 increases the hoistway loss by pressing the generator against the rail in accordance with the traveling resistance increase command. Can do.

  Further, for the traveling resistance adjusting means 22 having the configuration of FIG. 4, the traveling resistance control unit 13 can increase the hoistway loss by turning on the switch in accordance with the traveling resistance increase command.

  Next, the change in regenerative power when the hoistway loss is increased by the action of the traveling resistance adjusting means 22 will be described. FIG. 5 is a diagram showing a relationship between an increase in elevator loss and generation of regenerative power in Embodiment 1 of the present invention. It is a figure showing various time response waveforms at the time of regenerative operation in which an elevator descends with rated load.

  In FIG. 5, (a) is the elevator speed, (b) is the torque generated by the motor of the hoist when the conventional elevator control device is used, and (c) is the motor to the motor when the conventional elevator control device is used. Input power is shown. In this waveform (c), when the input power is positive, it corresponds to power running power, and when it is negative, it corresponds to regenerative power.

  Further, (d) shows a hoistway loss. The regenerative mode detection means 12 can determine that the regenerative mode is in effect because the elevator is descending at the rated load. Therefore, as a result of the traveling resistance control unit 13 outputting a traveling resistance increase command to the traveling resistance adjusting means 22, the elevator loss is increased during the traveling.

  Further, (e) shows the motor generated torque of the hoisting machine when the elevator control device according to the first embodiment of the present invention is used, and (f) uses the elevator control device according to the first embodiment of the present invention. In each case, the input power to the motor is shown.

  In the first embodiment, as described above, when the regenerative mode is determined, such as when the load in the car is rated loading and the descent operation is performed, or when the car is in the ascending operation without load, the running resistance force is determined. To increase hoistway loss torque. Increasing the traveling resistance force contributes to the direction of braking with respect to the traveling direction of the elevator. As a result, the electric motor generated torque during elevator travel is as shown in FIG. 5E, and the input power is as shown in FIG. 5F.

  Comparing (c) and (f) in FIG. 5, it can be seen that when the hoistway loss is increased, the regenerative power can be reduced more than usual (when the hoistway loss is not increased).

  As described above, according to the first embodiment, the regenerative power can be reduced by increasing the hoistway loss torque in the regeneration mode. As a result, for example, even in an operation mode in which the regenerative operation is continued, it is possible to prevent the regenerative power consumption circuit from being overloaded by suppressing the generation of regenerative power.

  Furthermore, in the case of a low-speed elevator, the power consumed by the regenerative resistor is reduced, so that heat generation of the regenerative resistor can be suppressed. In the case of a large capacity elevator, the power regeneration amount can be reduced. Furthermore, it is effective in reducing the power capacity.

  Furthermore, in the case of a power regenerative elevator, when power is supplied by a private generator, it is possible to reduce the regenerative power in consideration of the regenerative power capacity of the generator, and there is no need to limit the operation.

  Furthermore, in the case of an elevator equipped with a regenerative processing circuit with a machine room, it is also possible to suppress the temperature rise of the machine room by releasing regenerative energy through the hoistway. The same effect can be obtained in a method of generating energy, such as generating electricity when moving.

Embodiment 2. FIG.
In the first embodiment, the case where the regeneration mode is determined based on the load in the car and the operation direction and the hoistway loss torque is increased has been described. That is, at the start of traveling, it is determined whether or not the regeneration mode is based on the car load and the driving direction, and the mode is not switched halfway until one traveling is completed. Was one.

  On the other hand, the second embodiment is characterized in that the regenerative mode is determined based on the input power during traveling and the hoistway loss torque is increased. That is, it is possible to switch increase / decrease of hoistway loss torque according to the input current even during one run. In fact, it is normal that a power running state and a regenerative state are mixed even within one run.

  FIG. 6 is a diagram showing a relationship between an increase in elevator loss and generation of regenerative power in the second embodiment of the present invention. It is a figure showing various time response waveforms at the time of regenerative operation in which an elevator descends by rated load similarly to the first embodiment.

  In FIG. 6, (a) is the elevator speed, (b) is the torque generated by the electric motor of the hoisting machine when the conventional elevator control device is used, and (c) is the electric motor generated when the conventional elevator control device is used. The input power is shown and is the same as (a) to (c) of FIG.

  Further, (d) shows a hoistway loss. The regenerative mode detection means 12 inputs a voltage value and a current value consumed by the elevator drive as a regeneration mode determination signal, and calculates the input power (c) from the voltage value and the current value. And the regeneration mode detection means 12 can judge that it is a regeneration mode since input electric power became negative. Therefore, as a result of the traveling resistance control unit 13 outputting a traveling resistance increase command to the traveling resistance adjusting unit 22, the hoistway loss is switched in the middle of one traveling.

  More specifically, the regenerative mode detection means 12 can determine that the regenerative mode is in effect because the input power has become negative at point “A” in FIG. A traveling resistance increase command is output to the traveling resistance adjusting means 22 to increase the hoistway loss. On the other hand, the regenerative mode detection means 12 can determine that the regenerative mode has been lost because the input power has changed from negative to positive at the point “B” in FIG. The output of the traveling resistance force increase command to the force adjusting means 22 is stopped, and the original state in which the hoistway loss is eliminated is restored.

  Further, (e) shows the electric motor generated torque of the hoisting machine when the elevator control device according to the second embodiment of the present invention is used, and (f) uses the elevator control device according to the second embodiment of the present invention. In each case, the input power to the motor is shown.

  In the second embodiment, as described above, when the regenerative mode is determined because the input power is negative, the traveling resistance is increased to increase the hoistway loss torque. Increasing the traveling resistance force contributes to the direction of braking with respect to the traveling direction of the elevator. As a result, the electric motor generated torque during elevator travel is as shown in FIG. 6E, and the input power is as shown in FIG. 6F.

  Comparing the input power waveform in FIG. 5 (f) in the first embodiment with the input power waveform in FIG. 6 (f) in the second embodiment, in the second embodiment, the input power is even during one run. Since the hoistway loss is not increased when is positive, it can be understood that the required power (power running side power) can be prevented from being affected.

  As described above, according to the second embodiment, since the regenerative mode is determined based on the input power and the hoistway loss is adjusted, the regenerative power from the elevator is reduced and the power increase during powering operation is suppressed. Therefore, the power supply capacity can be further suppressed as compared with the first embodiment.

Embodiment 3 FIG.
In the third embodiment, an example in which the hoistway loss is changed with respect to a case where power is distributed and supplied from a single power supply system to a plurality of elevators will be described. FIG. 7 is a configuration diagram of the entire system when power is distributed and supplied to a plurality of elevators according to the third embodiment of the present invention from a single-line power supply system. The controller unit 10, the drive devices 20a to 20c, and the power supply 30 and a power receiving panel 40.

  FIG. 7 shows a case where power is distributed and supplied to the three elevator drive devices 20a to 20c through one line from the power supply 30. Moreover, although the drive control part 11 in the controller part 10 has shown the structure which controls each drive device 20a-20c, the drive control part 11 is good also as a structure provided separately in each drive device 20a-20c. Absent.

  In such a system, power is normally branched from the power receiving panel 40 to each elevator drive device 20a to 20c. In the power receiving panel 40, a voltage detector 41 that detects a voltage value in one line from the power supply 30 and a current detector 42 that detects a current value in one line from the power supply 30 are provided. Furthermore, in the power receiving panel 40, current detectors 43a to 43c for detecting respective current values after branching from one line to the respective driving devices 20a to 20c are provided.

  The regeneration mode detection means 12 in the present third embodiment reads the voltage value from the voltage detector 41 and the current values from the current detectors 42 and 43a to 43c, thereby determining the power state for each elevator and the system. The total power state can be calculated. That is, the regenerative mode detecting means 12 detects whether or not the regenerative mode is set for each elevator from the input power amount for each elevator, calculates the total power amount for the entire system, and outputs it to the running resistance control unit 13. To do.

  Next, the traveling resistance control unit 13 determines that the power source 30 has been switched to a generator (that is, the total power is regenerative power) from the information regarding the total power from the regenerative mode detection means 12. In some cases, the regenerative power is monitored so as not to exceed a predetermined reference value in consideration of the capacity of the regenerative power. Furthermore, when the total amount of regenerative power exceeds the reference value, the traveling resistance control unit 13 determines that the traveling resistance should be increased to reduce the regenerative power.

  Then, the traveling resistance control unit 13 is configured to increase the hoistway loss corresponding to the elevator determined to be in the regeneration mode based on the information about the regeneration mode for each elevator from the regeneration mode detection unit 12. An increase command is output to suppress regenerative power.

  The traveling resistance control unit 13 outputs a traveling resistance increase command for increasing the hoistway loss to a plurality of elevators depending on the number of elevators determined to be in the regenerative mode, and the regenerative power as the entire system. Suppress. In addition, when the regenerative power falls below a certain reference value, the traveling resistance control unit 13 cancels the output of the traveling resistance increase command, thereby returning the hoistway loss to the normal operating state. Like that.

  As described above, according to the third embodiment, when electric power is distributed and supplied from a single power supply system to a plurality of elevators, the regenerative power of individual elevators is controlled based on the regenerative power tolerance of the power supply. As a result, the overall regenerative power per line can be suppressed, and the power capacity can be further reduced as compared with the control of each elevator.

1 is an overall configuration diagram of an elevator control device according to Embodiment 1 of the present invention. It is the figure which showed the 1st specific example of the running resistance adjusting means 22 in Embodiment 1 of this invention. It is the figure which showed the 2nd specific example of the traveling resistance adjusting means 22 in Embodiment 1 of this invention. It is the figure which showed the 3rd specific example of the traveling resistance adjustment means 22 in Embodiment 1 of this invention. It is the figure which showed the relationship between the increase in the elevator loss in Embodiment 1 of this invention, and generation | occurrence | production of regenerative electric power. It is the figure which showed the relationship between the increase in the elevator loss in Embodiment 2 of this invention, and generation | occurrence | production of regenerative electric power. It is a block diagram of the whole system in the case of distribute | distributing electric power from the power supply system of 1 line | wire with respect to the some elevator in Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Controller part, 11 Travel control part, 12 Regeneration mode detection means, 13 Travel resistance control part, 20, 20a-20c Drive device, 21 Elevator mechanism part, 22 Travel resistance adjustment means, 30 Power supply, 40 Power receiving board, 41 Voltage detector, 42, 43a-43c Current detector.

Claims (4)

In an elevator control device including a traveling control unit that performs switching control between power running operation and regenerative operation according to an elevator car load and an operation direction,
Traveling resistance adjusting means capable of increasing traveling resistance during elevator traveling;
Regenerative mode detecting means for detecting whether or not the elevator is in the regenerative mode based on the input of the regeneration mode discrimination signal;
A running resistance control unit that increases the running resistance of the running resistance adjusting means by outputting a running resistance increase command when the regeneration mode detecting means detects that the regeneration mode is selected. An elevator control device characterized by that. In the elevator control device according to claim 1,
The regenerative mode detection means receives a signal relating to the car load and the driving direction as the regeneration mode determination signal from the travel control unit, and determines whether or not the regenerative mode is based on the car load and the driving direction. An elevator control device characterized by detecting. In the elevator control device according to claim 1,
Whether the regenerative mode detection means inputs a voltage value and a current value consumed by the elevator drive as the regenerative mode determination signal, and is the regenerative mode based on the input electric energy calculated from the voltage value and the current value. An elevator control device characterized by detecting whether or not. A power receiving panel that distributes power from a single line to a plurality of elevators, and a traveling control unit that controls the power running operation and regenerative operation of each elevator according to the load in the car and the operation direction of each elevator In the elevator control system,
Travel resistance adjusting means provided in each of the plurality of elevators, capable of increasing the travel resistance during elevator travel;
An individual current value consumed by each of the plurality of elevators, and a current value and a voltage value consumed by the one line are received from the power receiving panel as a regeneration mode determination signal, and based on the regeneration mode determination signal Regenerative mode detecting means for detecting whether each elevator is in regenerative mode and calculating the total amount of power,
When the total power calculated by the regenerative mode detection means is regenerative power and exceeds a predetermined reference value, the travel corresponding to the elevator that is in regenerative mode among the plurality of elevators An elevator control device comprising: a traveling resistance control unit that increases a traveling resistance of the traveling resistance adjusting means by outputting a traveling resistance increase command to the resistance adjusting means.

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