JPH10167595A - Elevator load detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load detecting device in which the calculated value of load obtained from the motor torque can be used as a detected value of load. SOLUTION: A load detecting device is composed of a motor torque command circuit 4, car position detection circuit 7, operating direction command circuit 8, a motor torque memory circuit 10, and a load calculation circuit 9, wherein the memory circuit 10 stores the motor torque commands in the respective conditions of the upper story and lower story when the elevator is operated with the load specified for installation adjustment. The unbalance load of a wire rope 19 depending upon the car position and the load calculation error caused by variation in the running resistance, etc., depending upon the operating direction are subjected to a proportional approximation by the load calculation circuit 9 on the basis of the data given by the memory circuit 10, and the obtained load calculation value is corrected and used as a load detecting device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator car load detecting device.

[0002]

2. Description of the Related Art Conventionally, in the case where a starter can be compensated for even without a car load detector (for example, Japanese Patent Laid-Open No. 1-2242375), a hard load detection is required as a car load detection required from group management or the like. This was done by a weight switch that is a configuration. Detection methods other than load detection in a hardware configuration using a weight switch, etc. include a method in which a load is calculated from a motor torque for the purpose of correcting a load detector.
For example, one described in JP-A-7-69557 is known. This is to correct the load detector by the load value calculated by the motor torque before the ride comfort deteriorates, even if the appropriate load correction value by the load detector at the time of installation deviates from the actual one due to aging. there were.

[0003]

However, the method using the weight switch having the hardware configuration has a problem that the cost is high. In addition, the detection method other than the load detection using the hardware configuration using the weight switch or the like has a problem. It is effective only in the auxiliary role of correcting the load detector, and when using the calculated load value as the load detector itself, it is not possible to correct the effects of the elevator car position and running resistance, so accurate load calculation is performed. Was limited to certain conditions. Therefore, there is a problem in accuracy at all car positions, and the calculated load value cannot be used as the detected load value itself.

In general, an elevator has a configuration shown in FIG. 1, in which a counter weight 20 is connected to an opposite end of a wire rope 19 suspended from a car 18.
The weight of the counterweight 20 is set so that the counterweight 20 is in an equilibrium state when a load of about 45% to 50% (= balance point) of the rated load of the elevator is loaded on 8. Further, to compensate for the weight of the wire rope 19, a compensating rope 21 is connected below the car 18 and the counterweight 21. In general, the weight of the compensating rope 21 compensates for about 90% to 110% of the weight of the wire rope 19, but there is a case where the compensating rope 21 is not provided, such as an elevator up-and-down stroke of 30 m or less or a view.

[0005] Usually, the unbalance load of the wire rope 19 due to the position of the car is about several percent of the rated load capacity.
For observation and the like without the compens rope 21, it is several tens%.

Further, the running resistance, the positive efficiency of the speed reducer 22 /
The effect of inverse efficiency is several percent.

[0007] When the above is combined, the calculation error becomes about several tens%, and there is a problem in using the calculated load value as the detected load value.

An object of the present invention is to perform load calculation correction in accordance with the position of the car and calculate the load separately according to the driving direction, thereby reducing the error and obtaining a load calculation value with high accuracy. An object of the present invention is to reduce the number of load detectors by using the device as a load detector.

[0009]

In order to achieve the above object, the present invention provides a speed control circuit for commanding a motor torque according to a deviation between an elevator speed command and speed detection, and a motor torque command at a predetermined load. A motor torque storage circuit for storing a value, and a load calculation circuit for calculating a load in the car by referring to the motor torque storage data from the motor torque command value. A load calculating and correcting means for correcting the load calculating value according to a direction, wherein the load calculating and correcting means linearly approximates the motor torque value stored at each of the car positions to obtain an unbalanced load of the wire rope at the car position. Is corrected. Also, by detecting each of the directions according to the operation direction of the elevator, it is possible to calculate the load with extremely high accuracy, and it can be used as a load detecting device.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Here, a description will be given of a load detecting apparatus used for canceling a mischievous call and passing a full load.

FIG. 1 is a block diagram according to one embodiment of the present invention.

When the car call detector 16 of the elevator operates, an operation command is generated by the operation command circuit 1 and the speed command circuit 2 operates. The speed command from the speed command circuit 2 and the motor speed detector 5 are input to the speed control unit 3, and the torque command circuit 4 generates a torque command to drive the motor 6.

On the other hand, the car position detecting circuit 7 detects the car position by the motor rotation speed detector 5 and outputs the detected car position to the load calculating circuit 10. Also, the operation direction command circuit 8 is operated from the operation command circuit 1, and the operation direction command is output to the load calculation circuit 9.
The load calculation circuit 9 calculates an appropriate load in consideration of the load correction by the torque command from the torque command circuit 4 and the elevator position, driving direction, and motor torque storage circuit 10. The mischief call analysis circuit 12 determines whether or not a mischief call is made by the load calculation value and the number-of-car calls detection counter 11, and if a mischief occurs, the car call detector 16 is canceled by the car call cancel circuit 13.

The calculated load value and the hall call detector 17 are analyzed by the packed passage analysis circuit 14, and when the hall is full, the seat is passed by the packed passage command circuit 15 without responding to the hall call.

Next, the motor torque storage circuit 10 and the load calculation circuit 9 will be described in detail.

FIG. 2 is a graph showing a relationship between a motor torque command value and an in-car load. The inclination of the torque is small near zero due to the running resistance of the elevator, and the difference between the no-load side and the full-load side is due to the difference between the forward / reverse efficiency of the reduction gear 22. is there.

In the motor torque storage circuit 10, a mischief call cancellation detection load W
_L (% of the rated load) is loaded in the car and the adjustment operation is performed. The torque command T _ULL on the lower floor during steady running during the ascending operation, the torque command T _UHL on the upper floor, and the descent operation during the descent operation Similarly, the torque command T _DHL for the upper floor and the torque command T _DLL for the lower floor are recorded in the storage memory. Next, the full passage detection load W _F (% of the rated load) is loaded in the car, and the same adjustment operation is performed. The torque command T _ULF on the lower floor during steady running during the ascending operation, and the torque command T _{ULF on} the upper floor torque command T _UHF of the torque command T _DHF at upper floors as well during lowering operation, records the torque command T _DLF at lower floor in the storage memory.

[0019] In the load calculation circuit 9 divides the motor torque data stored by the operation direction of the operation direction instruction circuit, then the load calculated value W Gaitazura call cancellation detector load W _L
And select close or stored data in either packed passage detection load W _F, performs load calculating a load calculation error by performing a linear approximation correction by the car position data stored in the closer. In other words, the car position linear approximation is to calculate an error in proportion to the difference between the torque storage data of the upper floor and the lower floor in proportion to the car position with respect to the uppermost position, thereby absorbing the motor torque difference due to the imbalance of the wire rope 19. It is.

As an example, a formula for calculating the load at the time of ascending operation upon detection of a mischief call cancellation will be described below.

[0021]

(Equation 1)

W: Load calculation value (%), T: Torque command, P
max: Top floor, P: Car position (floor) There are other load calculation formulas for descent operation when mischievous call cancellation is detected, and load calculation formulas for ascending / descending operation when passing through a packed space. It is a way of thinking.

In the above, the case where the load calculation reference load is set to two points has been described. By taking various load calculation reference loads, a highly accurate load calculation can be performed over the entire load area.

As described above, according to the present embodiment, it is possible to correct a load calculation error due to an unbalanced load of the wire rope 19 due to a car position, a running resistance, and the like, and it is possible to calculate a load with extremely high accuracy.

[0025]

According to the elevator load detecting device of the present invention, it is possible to correct load calculation errors such as unbalanced load of the wire rope due to the car position and running resistance depending on the driving direction, thereby enabling extremely accurate load calculation. Since the load calculation value can be used as the load detection value, the number of load detectors can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of an elevator load detecting device according to an embodiment of the present invention.

FIG. 2 is a graph for explaining a motor torque storage circuit and a load calculation circuit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation command circuit, 2 ... Speed command circuit, 3 ... Speed control circuit, 4 ... Torque command circuit, 5 ... Motor rotation speed detector, 6
... Motor, 7 ... Cage position detection circuit, 8 ... Operation direction command circuit, 9 ... Load calculation circuit, 10 ... Motor torque storage circuit,
11 ... car call detection counter, 12 ... mischief call analysis circuit, 13 ... car call cancellation circuit, 14 ... packed passage analysis circuit, 15 ... packed passage command circuit, 16 ... car call detector, 17 ... hall call detector, 18 ... Cage, 19 ... Wire rope, 20 ... Counterweight, 21 ... Compensation rope, 22 ... Reducer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunsuke Mine 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside the Mito Plant of Hitachi, Ltd. Mito factory

Claims (3)

[Claims] A speed control circuit for instructing a motor torque in accordance with a deviation between an elevator speed command and a speed detection; a motor torque storage circuit for storing a command value of the motor torque under a predetermined load; An elevator control device including a load calculation circuit that calculates a load in a car by referring to stored data of the motor torque from a command value,
An elevator load detection device, comprising: load calculation correction means for correcting the load calculation value according to a car position or an operation direction of the elevator when the elevator runs. 2. The elevator load detecting device according to claim 1, wherein said load calculating and correcting means corrects the unbalance load of the wire rope at said car position by linearly approximating the motor torque value stored at each of said car positions. . 3. An elevator load detecting device according to claim 1, wherein said load calculation and correction means detects each of the load directions based on an operation direction of the elevator.