JP4425716B2 - Elevator control device - Google Patents

Description

  The present invention relates to an elevator control device that controls a lifting speed when a car to be stopped reaches a predetermined lifting position of a hoistway to improve landing position accuracy at the time of stopping.

  In a conventional elevator control device, a traveling speed curve is set in advance for a car that goes up and down from a departure floor to a stop floor in an elevator hoistway, and a first deceleration switch is provided in the hoistway so that the first in the traveling speed curve. It is arranged at a position corresponding to the deceleration point. A second deceleration switch is provided closer to the stop floor than the first deceleration switch position of the hoistway, and is disposed at a position corresponding to the second deceleration point on the travel speed curve.

  The hoist that drives the car is controlled as described below. That is, when the car that moves up and down approaches the stop floor and operates the first deceleration switch, the first deceleration is commanded to the hoist that operates the car. Next, when the car approaches the stop floor and activates the second speed reduction switch, the second speed reduction is commanded to the hoisting machine, and then the hoisting machine is de-energized when the car elevates at the creep speed and a predetermined time elapses. The car is configured to stop at the stop floor. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 06-1000025 (page 4, FIG. 1)

  In a conventional elevator control device, the elevator lifting / lowering speed is controlled based on a traveling speed curve set in advance by both the first deceleration switch and the second deceleration switch. Then, the car can be landed with the desired accuracy when stopped. However, since both of the above installations are required in the elevator hoistway, there is a problem that the installation work, the adjustment of the installation position, and the maintenance work become work in the elevator hoistway, which requires complicated work.

  The present invention has been made to solve such a problem, and it is possible to obtain an elevator control device that can be installed with a small number of steps, and that can raise and lower a car to a stop floor with a desired accuracy. Objective.

The elevator control device according to the present invention includes a traveling speed curve preset for a car that moves up and down from a departure floor to a stop floor, a power converter that supplies power to a hoisting machine that operates the car, and a power converter for the power converter. On the other hand, a speed command device that commands the operating speed of the hoisting machine, a zero cross point counting device that counts the number of current zero cross points during operation of the power converter, and a running speed curve through the count value of this zero cross point counting device Control means for calculating the elevator position of the car and inputting a command speed corresponding to the elevator position of the car based on the calculated value to the speed command device, a scale device for generating an output corresponding to the load of the car, and a scale compensator which outputs a correction value for correcting the count value of the zero-crossing point counting device in accordance with the output value, the control means, weighing compensator to the count value of the zero-crossing point counting device Based on the value obtained by multiplying these correction values, a deceleration command is output when the car stops at the stop floor, and the balance compensator sets the correction value to 1 when the load on the car is small during the ascending operation of the car. Less than 1, when the car load is high, the correction value is 1 or more, and when the car is lowered, the correction value is 1 or more when the car load is low, and the correction value is less than 1 when the car load is high. By correcting the creeping of the car, the time required for the car to move up and down from the departure floor to the stop floor is shortened.

The elevator control device according to the present invention calculates a car ascending / descending position in the traveling speed curve via a count value of the zero cross point counting device when the power converter is operated, and a speed corresponding to the ascending / descending position of the car based on the calculated value Controls the hoisting motor. Thus, the car can be landed with the expected accuracy when the car moving up and down from the departure floor to the stop floor is stopped. Therefore, the car can be landed by controlling the ascending / descending speed of the car based on the preset traveling speed curve without installing a first deceleration switch or the like in the elevator hoistway. Therefore, installation work, adjustment of the installation position, and maintenance work in the elevator hoistway such as the first deceleration switch can be omitted, and the installation cost and the maintenance cost can be reduced.
Further, the creep travel time can be shortened, and the time for the car to move up and down from the departure floor to the stop floor can be shortened.

Embodiment 1 FIG.
1 to 3 are diagrams showing an embodiment of the present invention, FIG. 1 is a diagram conceptually showing the arrangement of equipment, and FIG. 2 is a traveling speed curve preset for the car of FIG. FIG. 3 is a graph showing a zero cross point of current in the power converter of FIG. In the figure, a driving sheave 2 is provided on the hoist 1 and an electric motor 3 that drives the driving sheave 2 is provided. A car 5 is connected to one end of the main rope 4 wound around the driving sheave 2, and a counterweight 6 is connected to the other end.

  The car 5 is provided with a scale device 7 that generates an output corresponding to the load in the car 5. In addition, a power converter 8 that supplies power to the motor 3 is connected, and a current detector 9 that is provided between the motor 3 and the power converter 8 to detect the motor current and output it as a current signal is disposed. A speed command device 10 that commands the ascending / descending speed of the car 5 is connected to the power converter 8, one side of the control means 11 is connected to the current detector 9, and the other side is connected to the speed command device 10.

  Further, the control means 11 is provided with a zero cross point counting device 12 that counts the number of current zero cross points 14 of the motor current shown in FIG. In addition, the traveling speed curve 13 when the cage | basket | car 5 which raises / lowers a hoistway raises / lowers from a departure floor to a stop floor is preset as shown in FIG.

  In the elevator control apparatus configured as described above, when the car 5 is given an up / down command from the departure floor to the stop floor, the control means 11, the speed instruction device 10, and the power conversion are performed according to a preset traveling speed curve 13. The electric motor 3 of the hoisting machine 1 is operated by the machine 8. When the car 5 is decelerated, two-stage control is performed, and when the count value of the current zero-cross point 14 of the zero-cross point counting device 12 becomes a value corresponding to the first deceleration point position after the departure of the car 5, the control means 11 A first deceleration command is input to the speed command device 10.

  Thereby, the power converter 8 operates corresponding to the first deceleration, and the electric motor 3 is first decelerated by this current value. When the car 5 further moves up and down and the count value of the current zero cross point 14 of the zero cross point counting device 12 becomes a value corresponding to the second deceleration point position after the departure of the car 5, the control means 11 sends the speed command device 10 Second deceleration command is input. As a result, the power converter 8 operates corresponding to the second deceleration, and the electric motor 3 is second-decelerated by this current value.

Next, the car 5 is creep-running for a predetermined time after the start of the second deceleration operation of the electric motor 3, and then the electric motor 3 is de-energized and the car 5 stops at the stop floor. The zero cross point counting device 12 is provided with a CPU having a calculation time earlier than the half cycle time of the motor current, and the count of the current value is changed to +1 when the sign of the current value is changed compared to the previous current value. To count the number of zero cross points. The time of the half cycle of the motor current is usually calculated from the following equation 1.
Half cycle time = 1 / (frequency output from speed command device) x 2 [s] (Equation 1)

  As described above, the raising / lowering position of the car 5 in the traveling speed curve is calculated through the count value of the zero crossing point counting device 12 when the power converter 8 is operated, and the raising / lowering position of the car 5 corresponding to the calculated value is obtained. The electric motor 3 of the hoist 1 is controlled by the speed. Thereby, the car 5 can be landed with the expected accuracy when the car 5 moving up and down from the departure floor to the stop floor is stopped.

  Thus, the ascending / descending speed of the car 5 can be controlled based on a preset traveling speed curve without installing a first deceleration switch or the like in the elevator hoistway. Then, the car can be landed at the desired accuracy when stopped. Accordingly, installation work, adjustment of the installation position, and maintenance work in the elevator hoistway such as the first deceleration switch can be omitted. For this reason, the car 5 which moves up and down can be normally landed on the stop floor with less labor and cost.

Embodiment 2. FIG.
4 and 5 are diagrams showing another embodiment of the present invention. FIG. 4 is a graph showing a running speed curve set in advance for the car. FIG. 5 is a car running controlled by a timing device. It is a graph which shows a speed curve. In addition to the examples shown in FIGS. 4 and 5, an elevator control device according to FIGS. 1 to 3 is configured. And the traveling speed curve 13 when the cage | basket | car 5 which raises / lowers a hoistway raises / lowers from a departure floor to a stop floor is preset as shown in FIG.

  In the embodiment of FIGS. 4 and 5 as well, when the elevator 5 is issued to the car 5 from the departure floor to the stop floor, as in the embodiment of FIGS. According to the speed curve 13, the motor 3 of the hoisting machine 1 is operated by the control means 11, the speed command device 10, and the power converter 8. That is, the ascending / descending position of the car 5 in the traveling speed curve is calculated via the count value of the zero cross point counting device 12 when the power converter 8 is operated.

  Next, the electric motor 3 of the hoisting machine 1 is controlled at a speed corresponding to the raising / lowering position of the car 5 based on the calculated value of the raising / lowering position of the car 5. As a result, the car 5 can be landed with the expected accuracy when the car 5 that moves up and down from the departure floor to the stop floor is stopped. Therefore, in the embodiment shown in FIGS. 4 and 5, the installation of the first reduction switch and the like can be omitted in the hoistway. Is obtained.

  Further, in the elevator control of the embodiment shown in FIGS. 1 to 3, the first creep speed and the second creep speed shown in FIG. Creep driving operation is performed. However, the longer the creep travel time, the longer the car 5 travels up and down from the departure floor to the stop floor. In order to prevent this lengthening of the traveling time, the zero cross point counting device 12 is provided with a time limit device (not shown) in the embodiment shown in FIGS.

  Then, as shown in the travel speed curve 15 shown in FIG. 5, the deceleration command based on the first deceleration point position based on the count value of the zero cross point counting device 12 is limited to T1, and the deceleration command based on the second deceleration point position is limited to T2. Delay. As a result, it is possible to reduce the total up / down traveling time for the car 5 to move up and down from the departure floor to the stop floor, and to improve the operation efficiency of the elevator. The time limit device of the zero cross point counting device 12 is set to “0” at the time of shipment from the factory so that the landing position of the car 5 does not shift during elevator installation adjustment.

Embodiment 3 FIG.
6 and 7 are diagrams showing another embodiment of the present invention. FIG. 6 is a diagram conceptually showing the arrangement of the devices. FIG. 7 is a balance compensation device for the output value of the zero-cross point counting device in FIG. It is a graph which shows the correction value. In the figure, the same reference numerals as in FIGS. 1 to 3 indicate the corresponding parts, and one side of the balance compensation device 16 is connected to the balance device 7 of the car 5, and the other side is connected to the zero cross point counting device 12.

  Then, the balance compensation device 16 corrects the count value of the zero cross point counting device 12 based on the load in the car 5 by the output of the scale device 7 as described below. That is, when the load in the car 5 is 50% of the rated load, the zero crossing point count correction value α = 1 is output, and when the car 5 is in the ascending operation, the ascending operation correction value line 17 shown in FIG. During operation, a zero cross point count correction value α is output by the descending operation correction value line 18 shown in FIG.

  Also in the elevator control apparatus configured as described above, when the car 5 is given an up / down command from the departure floor to the stop floor, as in the above-described embodiments of FIGS. According to the speed curve 13, the motor 3 of the hoisting machine 1 is operated by the control means 11, the speed command device 10, and the power converter 8. That is, the ascending / descending position of the car 5 in the traveling speed curve is calculated via the count value of the zero cross point counting device 12 when the power converter 8 is operated.

  Next, the electric motor 3 of the hoisting machine 1 is controlled at a speed corresponding to the raising / lowering position of the car 5 based on the calculated value of the raising / lowering position of the car 5. As a result, the car 5 can be landed with the expected accuracy when the car 5 that moves up and down from the departure floor to the stop floor is stopped. Accordingly, in the embodiment shown in FIGS. 6 and 7, the installation of the first reduction switch and the like can be omitted in the hoistway. Therefore, detailed description is omitted, but the same operation as the embodiment shown in FIGS. Is obtained.

  6 and 7, the count value of the zero cross point counter 12 is corrected by the balance compensator 16 in accordance with the load in the car 5. That is, if the load in the car 5 is less than 50% of the rated load during the ascending operation of the car 5, the zero cross point count correction value α is less than 1 corresponding to the load in the car 5, and the load in the car 5 is rated. If it is 50% or more of the load, the zero cross point count correction value α is 1 or more corresponding to the load in the car 5.

If the load in the car 5 is less than 50% of the rated load during the descent operation of the car 5, the zero cross point count correction value α is 1 or more corresponding to the load in the car 5, and the load in the car 5 is rated. If it is 50% or more of the loading amount, the zero cross point count correction value α is less than 1 corresponding to the load in the car 5. As a result, the creep travel at the first creep speed and the second creep speed shown in FIG. 4 is corrected, and the time for the car 5 to travel up and down from the departure floor to the stop floor can be shortened. Can be improved.

Note that the ascending operation correction value line 17 and the descending operation correction value line 18 shown in FIG. 7 do not have to have a proportional relationship corresponding to the load in the car 5 as the characteristics of the correction value line, and correspond to the load in the car 5. It is also possible to consist of curves set appropriately. That is, the characteristic pulse based on the correction value line is a value obtained by multiplying the basic pulse by the zero crossing point count correction value α as shown in the following equation 2, and thereby the deceleration point and the landing point can be set.
Pulse N = Basic pulse Ne × Zero cross point count correction value α (Expression 2)

The figure which shows Embodiment 1 of this invention, and is a figure which shows arrangement | positioning of an apparatus notionally. The graph which shows the traveling speed curve preset with respect to the cage | basket | car of FIG. The graph which shows the zero crossing point of the electric current in the power converter of FIG. It is a figure which shows Embodiment 2 of this invention, and is a graph which shows the running speed curve preset with respect to the cage | basket | car. The graph which shows the running speed curve of the cage | basket | car controlled by a time limit apparatus. It is a figure which shows Embodiment 3 of this invention, and is a figure which shows arrangement | positioning of an apparatus notionally. The graph which shows the correction value of the balance compensation apparatus with respect to the output value of the zero crossing point counter in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Hoisting machine, 5 cages, 7 Weighing device, 8 Power converter, 10 Speed command device, 11 Control means, 12 Zero cross point counting device, 13 Running speed curve, 16 Weighing compensation device

Claims (3)

A running speed curve set in advance for the car that goes up and down from the departure floor to the stop
A power converter for supplying power to the hoist that drives the car;
A speed command device for commanding the operating speed of the hoisting machine to the power converter;
A zero-crossing point counting device for counting the number of current zero-crossing points during operation of the power converter;
Control means for calculating the raising / lowering position of the car in the traveling speed curve via the count value of the zero-crossing point counting device, and inputting a command speed corresponding to the raising / lowering position of the car based on the calculated value to the speed command device; ,
A scale device that generates an output according to the load of the car;
A balance compensation device that outputs a correction value for correcting the count value of the zero cross point counting device according to the output value of the scale device;
Equipped with a,
The control means outputs a deceleration command when the car stops at the stop floor based on a value obtained by multiplying the count value of the zero-crossing point counter by the correction value from the balance compensation device,
The scale compensation device sets the correction value to less than 1 when the car load is low, when the car load is low, and when the car load is high, the correction value is 1 or more. The correction value is set to 1 or more when the car load is low, and the correction value is set to less than 1 when the car load is high to correct the creeping of the car and the car moves up and down from the departure floor to the stop floor. Reduce travel time
An elevator control device characterized by that . In the above-described balance compensation device, when the car load is within a predetermined range in which the load in the car is less than 50% of the rated load, the correction value is less than 1, and the load in the car is 50 of the rated load. If the predetermined range is not less than 50%, the correction value is 1 or more. If the load in the car is a predetermined range in which the load in the car is less than 50% of the rated load, the correction value is 1 or more. 2. The elevator control device according to claim 1, wherein the correction value is less than 1 when the load in the car is within a predetermined range of 50% or more of the rated load capacity . The scale compensation device has a correction value of less than 1 when the car load is less than a predetermined reference value, and a correction value of 1 or more when the car load is greater than or equal to the reference value. In addition, when the car is lowered, the correction value is 1 or more when the car load is less than the reference value, and the correction value is less than 1 when the car load is the reference value or more. The elevator control device according to claim 1.

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