JP2000344434A - Motor characteristic computing method for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an accurate motor load characteristic of an elevator by obtaining approximate characteristic curves on the basis of each torque measured value measured at the ascending time and descending time of a car, and shifting the approximate characteristic curves into line symmetrical positions in a heavy load area with a balance point as an axis of ordinate. SOLUTION: Torque command values 18a-18c and torque command values 19a-19c are measured from the ascending operation time and descending operation time of a car using only the load in a light load area or less. A balance point 21 is computed from approximate characteristic curves 20a, 20b obtained on the basis of the measured values. A 'full' display function can be set by computing a torque command value at the time of load 80% from a motor characteristic curve formed of continuous characteristic curves 20a, 22b and continuous characteristic curves 20b, 22a obtained by shifting the approximate characteristic curves 20a, 20b in line symmetrical positions in a heavy load area with the balance point 21 as an axis of ordinate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for calculating motor characteristics of an elevator.

[0002]

2. Description of the Related Art Generally, an elevator is driven by a motor 4 by connecting a car 1 and a counterweight 13 to both ends of a rope 3 wound around a sheave 11 of a traction machine 4 as shown in a schematic configuration diagram of FIG. Traction machine 4
The car 1 is configured to move up and down, and the car 1 detects the load of the car and performs a function, for example, a function of notifying a passenger waiting in an elevator hall of a full capacity indication, A function or the like is provided for canceling the state in which a large number of destination floor registration buttons are registered in the basket and for registering only the nearest floor among the registered floors.

[0003] The former function is that the car 1 has a rated load of 8
0% or more is detected and displayed in the elevator hall. An actual load of 80% of the rated load is loaded on the car 1, and the torque command value when the elevator runs is stored. , When the torque command value is larger than the torque command value, the full display is set.
The latter function detects the load in the car 1 is 20% or less of the rated load and performs the function. The actual load of 20% of the rated load is loaded on the car 1 and the elevator is operated. The torque command value at the time of running is stored. If the torque command value is smaller than the torque command value, that is, if the rated loading load is 600 kg, it is 120 kg or less, and the destination floor registration button in the car 1 is 80% or more of the total floor number. Is operated in a registered state.

On the other hand, in the elevator motor characteristic calculation method described in Japanese Patent Application Laid-Open No. 7-330245, at least two types of different light loads are used, and the relationship between the load amount and the detected load value is stored. Thus, the load is obtained from the load detection value, thereby reducing the labor and time required to load the actual load on the car 1.

[0005]

However, the conventional method for calculating motor characteristics of an elevator uses two different types of light loads to store the relationship between the load amount and the load detection value, and to calculate the load from a certain load detection value. Therefore, it is possible to reduce the burden on the operator, but in some cases it can be applied if the torque command characteristic curve is linear, that is, a straight line like a DC motor, but an AC motor is used. In this case, the relationship between the torque command value and the load amount is not necessarily linear, and even if the relationship between the load amount and the load detection value is obtained by a straight-line approximation or an n-th approximation curve, the error increases, and It was not possible to set a relationship between the load amount and the load detection value.

It is an object of the present invention to provide an elevator motor characteristic calculation method capable of obtaining an accurate elevator motor load characteristic using only a light load.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an elevator car and a counterweight which are connected to each other in a hanging manner by a rope, and a plurality of loads are loaded on the car to measure a torque. In an elevator motor characteristic calculation method for obtaining a characteristic curve,
Using a plurality of loads below the light load area, measure the torque measurement value at the time of the rise and fall of the car, and find the balance point from the approximate characteristic curve by each torque measurement value, and then set this balance point to the vertical axis The characteristic curve is obtained by relocating the approximate characteristic curve to a position that is symmetrical in a heavy load region.

In the method for calculating motor characteristics of an elevator according to the present invention, the car is raised and lowered under a plurality of different load conditions below the light load region, and a characteristic curve is obtained from the measured torque at that time. As a light load area or less, for example, a no load state and a light load can be used, a balance point can be obtained easily and accurately, and a motor load of an elevator can be easily and quickly obtained from a torque measurement value corresponding to a predetermined heavy load. Characteristics can be obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a schematic configuration diagram of a general elevator. A brake 15, a traction machine 11 and a sheave 4 thereof are connected to a motor shaft 12 a of the motor 12, and a car 1 and a counterweight 13 are respectively connected to both ends of the rope 3 wound around the sheave 4. When the motor shaft 12a of the motor 12 rotates according to a command from the control device 12b, the sheave 4 of the traction machine 11 rotates, and the car 1 moves up and down due to friction between the sheave 4 and the rope 3, and the car moves according to another command from the control device 12b. 1 stops, the brake 15 causes the motor shaft 12a
It is configured to prevent the rotation of. The torque command value of the motor 12 when the car 1 moves up and down is measured by the torque command measuring device 6.

FIG. 1 is a characteristic diagram showing a relationship between a loaded load for calculating a balance point and a torque command value of a motor in an elevator motor characteristic calculating method according to an embodiment of the present invention. The rated speed of the elevator is 60 m / min, and the rated load is 600 kg. An elevator is actually loaded with a load 5 less than the light load area in the car 1 and a torque command value or a torque measurement value such as a motor current value is measured. ing. First, the elevator car 1 is operated at a high speed from the lowest floor to the highest floor with no load, and the torque command value 1 applied to the motor 12 at the middle floor position of the car 1
Read 8a. Similarly, while the elevator car 1 is in a no-load state, the car 1 is driven at a high speed from the top floor to the lowest floor, and a torque command value 19a applied to the motor 12 at the middle floor position of the car 1 is read.

Next, a load 5 of, for example, 60 kg is loaded on the car 1, and in this state, the car 1 is operated at a high speed from the lowest floor to the highest floor, and a torque command value 18b applied to the motor 12 at the intermediate floor position of the car 1 Read. 60k for car 1
Under the condition that the load 5 is loaded, the high-speed operation is performed from the top floor to the bottom floor, and the torque command value 19b applied to the motor 12 at the middle floor position of the car 1 is read.

Thereafter, a load is added and the car 1
With the load 5 of g, the high-speed operation is performed from the lowest floor to the highest floor, and the torque command value 18c applied to the motor 12 at the middle floor position of the car 1 is read. Similarly, car 1 has 120
With a light load of 5 kg loaded, this time the car is driven at high speed from the top floor to the bottom floor, and the motor 12 at the middle floor position of the car 1
Is read.

Thus, three types are selected as the loads 5 in the light load region or less, the approximate characteristic curve 20a is obtained from the torque command values 18a, 18b, 18c when the car 1 rises, and when the car 1 descends. Of the torque command value 19a,
An approximate characteristic curve 20b is obtained from 19b and 19c, and an intersection between the approximate characteristic curve 20a and the approximate characteristic curve 20b is a balance point 21. With the obtained balance point 21 as the vertical axis, these approximate characteristic curves 20a, 20
b is relocated to a position symmetrical with the line in the heavy load region to obtain characteristic curves 22a and 22b. Then, the load characteristic at the time of ascent of each load of the elevator is represented by a continuous characteristic curve 20a, 2
2b, and the load characteristics at the time of the descent of each load of the elevator become continuous characteristic curves 20b and 22a, and these continuous characteristic curves 20a and 22b and the continuous characteristic curves 20b and 22a become motor characteristic curves. The above-mentioned full capacity display function has a load of 80% of the characteristic curves 22a and 22b.
May be calculated and set.

As can be seen from FIG. 1, the load 5 below the light load range is 50% or less of the rated load of the car 1, preferably 25% or less of the rated load of the car 1, and includes the unloaded state. I have to.

Next, a comparison will be made with the case where the balance point 21 thus obtained is actually measured. FIG. 3 is a characteristic diagram showing a relationship between a loaded load and a motor current for calculating a balance point 9 in a general elevator motor characteristic calculating method, and the horizontal axis represents a ratio of a loaded load in a car to a rated loaded load. The percentage and the vertical axis represent the motor current value.

Using the same elevator as that described above, first, the elevator car 1 is operated at a high speed from the lowest floor to the highest floor with no load, and the motor 1 at the middle floor position of the car 1 is used.
2 is read. Similarly, with the elevator car 1 in a no-load state, the car 1 is operated at a high speed from the top floor to the bottom floor, and the motor current value 7a applied to the motor 12 at the middle floor position of the car 1 is read.

Next, a load 5 of 25% is loaded on the car 1, and in this state, the car 1 is operated at a high speed from the lowest floor to the highest floor, and the motor current value 8b applied to the motor 12 at the intermediate floor position of the car 1 Read. Car 1 also has 25% load 5
Then, high-speed operation is performed from the top floor to the lowest floor, and the motor current value 7b applied to the motor 12 at the middle floor position of the car 1 is read. Similarly, 50%, 75%, 10%
With the 0% load 5 loaded on the car 1, the motor current values 8c, 8d, 8e during the ascending operation are read, and the motor current values 7c, 7d, 7e during the descending operation are read.

From these motor current values, characteristic curves 7, 8
And the intersection of these characteristic curves 7 and 8 becomes the balance point 9. This balance point 9 and FIG.
Comparing with the balance point 21 calculated as described above, it can be seen that they substantially match.

However, according to the method for calculating the motor characteristics of the elevator including the calculation of the balance point 21 shown in FIG. From torque command value 1
8a to 18c and torque command values 19a to 19c are measured, and the approximate characteristic curves 20a and 20b obtained based on these are measured.
From the approximate characteristic curves 20a and 20a,
0b is relocated to a position symmetrical with the line in the heavy load region, the load 80 is obtained from the continuous characteristic curves 20a and 22b and the motor characteristic curve composed of the continuous characteristic curves 20b and 22a.
%, It is possible to calculate the torque command value at the time of%, and to set the above-described packed display function. Therefore, the balance point 21 can be calculated easily and accurately, and the torque command value corresponding to an arbitrary load can be easily calculated. Can be calculated. Therefore, the actual load of 80% of the rated load
The work of loading and unloading the work can be omitted, and not only the labor of the worker can be significantly reduced, but also the work time can be shortened.

As described above, the load below the light load range is at least 50% or less of the rated load of the car 1,
Desirably, the torque command value using two different loads 5 of 25% or less of the rated load of the car 1 may be measured. Loading and unloading becomes easier, and not only the labor of the operator can be significantly reduced, but also the working time can be further reduced.

The calculation of the balance point 21 and the calculation of the torque command value when the load is 80% are performed by using a portable maintenance and inspection work device, and measuring the current value during the ascending operation of the car 1 measured during the inspection of the elevator. The motor characteristic curves shown in FIG. 1 can be displayed by simply inputting the torque command values for the current values 18a to 18c and the current values 19a to 19c when the car 1 descends. The program may be configured to calculate the torque command value at that time.

It should be noted that the light load 5 in the above-described embodiment is
For example, it is possible to use a plurality of metal rigid bodies whose loads are confirmed in advance, or to use a liquid in a container. In the above-described embodiment,
Although the torque command value is used as the measurement value for each light load 5, the present invention can be implemented using a torque measurement value such as the torque current value of the motor 12.

[0023]

As described above, the method for calculating the motor characteristics of an elevator according to the present invention measures the torque measured at the time of raising and lowering the car by using a plurality of loads under the light load area, and measures each torque. By moving the approximate characteristic curve based on the value to a position that is axisymmetric in the heavy load region with the balance point as the vertical axis and obtaining the characteristic curve, the balance point can be calculated easily and accurately,
From this characteristic curve, it is possible to easily calculate a torque command value or the like corresponding to an arbitrary load, and to omit the loading / unloading operation of a relatively heavy actual load as in the related art, and to significantly reduce the labor of the operator. Work time can be reduced.

[Brief description of the drawings]

FIG. 1 is a characteristic diagram illustrating a relationship between a loaded load and a torque command value for explaining a method of calculating an elevator motor characteristic according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a general elevator.

FIG. 3 is a characteristic diagram showing a relationship between a loaded load and a motor current value for explaining a conventional method for calculating motor characteristics of an elevator.

[Explanation of symbols]

 Reference Signs List 1 car 3 rope 5 load 6 torque command measuring device 12 motor 13 counterweight 18a-18c torque command value 19a-19c torque command value 21 balance point

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Daisuke Minegishi 1-6, Kandanishikicho, Chiyoda-ku, Tokyo F-term in Hitachi Building Systems Co., Ltd. (reference) 3F304 BA07

Claims (5)

[Claims] 1. A method for calculating motor characteristics of an elevator, comprising: connecting an elevator car and a counterweight with a rope in a hanging manner, and obtaining a characteristic curve from torque measurement values measured by loading a plurality of loads on the car. Using a plurality of loads below the light load area, measure the torque measurement value at the time of the rise and fall of the car, and find the balance point from the approximate characteristic curve by each torque measurement value,
A method for calculating motor characteristics of an elevator, wherein the characteristic curve is obtained by moving the approximate characteristic curve to a position that is line-symmetric in a heavy load region with the balance point as a vertical axis. 2. The method according to claim 1, wherein the load in the light load area is 50% or less of the rated load of the car. 3. The method according to claim 1, wherein the load below the light load region includes no load. 4. The method according to claim 1, wherein the load in the light load area is 25% or less of the rated load of the car. 5. The motor characteristic of an elevator according to claim 1, wherein the torque measurement value is a torque command value at an intermediate position when the car travels from the lowest floor to the highest floor. Calculation method.