JPS6274890A - Controller for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an elevator control device, and particularly relates to a light design,
The present invention relates to an elevator control device that is capable of reducing the size and weight of equipment and equipment through limit design.

[Technical background of the invention and its problems] In general, when an elevator is installed in a building, the power supply equipment capacity and the rated capacity of each equipment/device are determined by It is often calculated and specified based on driving (constant driving at rated speed). Therefore, when selecting the design 9 of equipment/equipment, the various values calculated under the above operating conditions are important points. In particular, since the acceleration/deceleration of the elevator can be set arbitrarily, the characteristics such as the torque and current of the elevator driving electric motor, the current capacity of the equipment and equipment, etc. are determined by one shift.

The formula for calculating elevator acceleration/deceleration torque is shown below.

TMα: Acceleration torque <Ky・m) TMβ: Deceleration torque (Kg・m) GDM2: GD2 of hoisting motor (Kg・Td) GD,
2: GD2 for live load (Kg・Td) GDs2:
GD2 (/cy-m) α, β of the linear motion part: Elevator acceleration/deceleration (m /52) TL square Unbalanced torque η of the car and the counterweight. , ηβ: 1 for efficiency during acceleration/deceleration: Unit conversion coefficient (R/19.6・D) R: Roping or gear reduction ratio (R>1) D: IJA vehicle diameter (m
) GD, 2 and GDs in the above (1+, (2) formula)
2 is a motor shaft conversion value, and GDs2 does not include the live load.

Further, equation (3114+) shows the equation for calculating GD2 for the unbalanced torque and live load in equations (1) and (2) above.

TL = (W WRAT E・K2)・D/R・・
・(3) GDL 2-W-02・K3/R...(4)
W: Live load (Kg) WRATE: Rated live load (Ky) K2 Niover balance (K2 < 1 to 3: Motor shaft conversion coefficient From equations (1) and (3) above, it can be seen that when the live load is large, the acceleration α It can be seen that the larger the set value of is, the greater the torque the electric motor generates.Also, 2 for overbalance in the above equation (3) is generally set to 0.5 or a slightly smaller value.And, Generally, the acceleration/deceleration of an elevator is set to be constant so that the running time is constant regardless of the loaded load.

Incidentally, elevators may be operated at a load exceeding the rated load capacity due to legal requirements or for special operating purposes. Even in such a state, the electric motor operates at the set acceleration/deceleration rate, so the torque generated by the electric motor greatly exceeds the torque at the time of rated loading. In the conventional electric motor, it is necessary to design the torque and current characteristics in consideration of the above-mentioned operation, and thus the motor is actually very wasteful due to its large size and flea. Furthermore, as the main circuit current increases as the acceleration/deceleration torque increases, control equipment/devices that are commensurate with this increase are also required.

[Object of the Invention] The present invention was made to solve the above-mentioned problems, and its purpose is to provide an elevator that can reduce the size and weight of equipment and devices through economical design and limit design. The purpose is to provide a control device.

[Summary of the Invention] In order to achieve the above object, the present invention provides an elevator control device that controls the operation of an elevator by controlling the speed of an elevator driving electric motor according to a speed command. A torque calculation means calculates the torque required to be generated by the electric motor during each acceleration/deceleration, and it is determined whether the calculated value calculated by this torque calculation means is within a specified torque value, and the calculated value is determined as the specified torque value. The present invention is characterized in that it includes an acceleration/deceleration setting means for changing the acceleration/deceleration setting value of the speed command on the condition that the acceleration/deceleration is not within the specified torque value, so that the torque generated by the electric motor is always within the specified torque value.

[Embodiments of the invention] An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 shows an example of the configuration of an elevator control device according to the present invention.

In the figure, 1 is a speed command calculation unit that generates a speed command signal 1A for the elevator, 2 is a speed control device that controls the speed of the electric motor, 3 is an AC power supply, 4 is an electric motor for driving the elevator, and 5 is an electric machine rotating shaft. 6 is a car, 7 is a hanging weight, and 8 is a main rope connecting the car 6 and the hanging weight 7 via the sheave 5. Further, 9 is a load detection device that detects the load of the elevator and outputs a load signal 9A, 10 is an operation unit that outputs an ascending/descending operation command signal 10A, etc., and 11 is an input unit for each of the above-mentioned signals 9A and IOA. , and is a torque calculation and acceleration/deceleration setting section that calculates the required torque generated by the acceleration/deceleration special electric machine a according to these, and outputs an appropriate acceleration/deceleration command signal 11A to the speed command calculation section 1.

Next, the operation of this configuration will be explained.

FIG. 2 is a flowchart showing an overview of the torque calculation and acceleration/deceleration speed setting method.

First, when entering this routine, the elevator operation command (SPE)
). (The operation command SPE is “1” during operation.
, 110 I+ when stopped) As a result, if the elevator is stopped (SPE'"O"), then it is checked whether a direction has been selected. In this case, XU becomes 1 when the ascending direction is selected, and XD becomes "1" when the descending direction is selected. Then, in a stopped state with no direction selection (SPE, XU, and XD are all r"Q"
), the acceleration/deceleration is set to the normal value.

(α; αRA T E sβ = βRATE) Next, when a direction is selected in a stopped state (XU or XD is “1”), torque calculation and acceleration/deceleration calculation are performed, and the calculated value is set for acceleration/deceleration. be done. (α=αL
OA O, β=βLOA[)) Furthermore, the operation command SPE
When the acceleration/deceleration becomes "1'°, the previous value of this routine is set as the acceleration/deceleration.

For example, a program using a microcomputer,
If the software is created so that this routine is passed through every calculation cycle, the calculation value immediately before the operation command SPE becomes "1" (α-αL OA O+β = βLOA[)>
is set, and that value is continuously held during operation (SPE "1"). Then, at the end of this routine, the acceleration/deceleration setting value 11A (α.

β) is output to the speed command calculation section 1.

Next, FIG. 3 (a>(b) is a flowchart showing the torque/acceleration/deceleration calculation subroutine in FIG. 2, which performs torque calculation/acceleration/deceleration calculation.

First, this routine reads the fixed data necessary for the calculation. (The data may be read each time a calculation is performed.) This data is a fixed value or set value that varies little depending on the elevator. For example, in a microcomputer system, it is stored in ROM (read-only memory), digital switch, or RAM (read-write Just set it as data in memory).

Next, live load data W, which is variable input data for this routine, is read. After reading this data, first, the unbalanced torque TL shown in equation (3) above is calculated. This unbalanced torque TL is the unbalanced load WRe K2
! If the live load is larger than (Ng), it will be a positive value, and if it is smaller, it will be a negative value. When the unbalanced torque TL and the calculation of GD2:GDL2 for the load are completed, the operating direction of the elevator is determined, and the normal acceleration/deceleration setting value (αRATE + βRATE) is calculated according to the operating direction. Therefore, convert it to the appropriate polarity.

(In this example, all fixed data will be explained as positive values.

) Furthermore, the absolute value calculation ITMα1 of the acceleration torque TMα shown in the above equation (1), and the acceleration torque T shown in the equation (21)
Absolute value calculation ITMβ1 of Mβ is performed. First, the fixed data acceleration torque maximum value T (IMAX and lTMα1
If TaMAX≧ITMLl, set the normal acceleration αRATE as the acceleration α, and set T (IM
If A X < I 7Mα1, the above (
1) Calculate αLOAO from the inverse calculation of the equation and set the value.

The same judgment and calculation are performed for the deceleration β, and the normal deceleration βRATE or the calculated value β of equation (6)
Set LOAD.

As described above, in this embodiment, the magnitude of the required torque generated by the electric motor for acceleration/deceleration is calculated according to the live load data and the operating direction of the elevator, and if this calculated value exceeds the specified value, the specified value is Since the acceleration/deceleration corresponding to the motor is determined from the inverse calculation and that value is set as the acceleration/deceleration, the torque generated by the electric motor can always be kept within the specified value. In addition, the normal acceleration/deceleration αRA T E %βRATE
Even if the setting is changed, the acceleration/deceleration maximum torque limit value T aM
If A.sub.X +T.beta.MAX is not changed, the above-mentioned effect is properly achieved.

Therefore, when designing an electric motor on the premise of controlling such an elevator, economical design and limit design become possible. Additionally, similar selections can be made for the main circuit section of the control device. Furthermore, the margin of mechanical equipment can be increased by limiting the maximum torque.

In the flowcharts shown in FIGS. 3(a) and 3(b), acceleration/deceleration torque ITMα1. Although lT and β1 were always calculated, if the unbalanced torque TL and the operating direction of the elevator are known, it is possible to determine whether the maximum torque is reached during acceleration or deceleration, as shown in Figures 4 (a) and (b). It becomes possible to omit calculation routines as shown in flowcharts.

Furthermore, since the motor torque does not reach the maximum torque near the balanced torque, the calculation may be performed only when the absolute value IT,l of the unbalanced torque TL exceeds the specified value TLRATE, and the flowchart is shown in FIG. shows. In FIG. 5, for example, if TL RA T E is set equal to TL at rated loading, it becomes possible to limit acceleration/deceleration only when the elevator carrying load amount exceeds the rated value.

Furthermore, although the operation was shown in the flowchart in the above embodiment, it can be easily realized by software in recent elevator apparatuses equipped with microcomputers.

Furthermore, although the functions are shown in block form in Figure 1,
It is also possible to perform all calculations such as driving operation, speed command calculation, speed control calculation, etc. using the same microcomputer system.

[Effects of the Invention] As explained above, according to the present invention, in an elevator control device that controls the operation of an elevator by controlling the speed of an elevator driving electric motor according to a speed command, a torque calculation means for calculating the torque required to be generated by the electric motor during acceleration/deceleration; and determining whether or not the calculated value calculated by the torque calculation means is within a specified torque value; and acceleration/deceleration setting means for changing the acceleration/deceleration set value of the speed command on the condition that the motor does not exceed the specified torque value.
It is possible to provide an extremely reliable elevator control device that can reduce the size and weight of equipment and equipment through economical design and limit design.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a flowchart showing an overview of the torque calculation and acceleration/deceleration setting method in the same embodiment, and Fig. 3 (a) (b).
) is a flowchart showing the torque/acceleration/deceleration calculation subroutine in FIG. 2, and FIGS. 4(a) to 5(C) and 5 are flowcharts showing other embodiments of the present invention, respectively. 1...Speed command calculation section, 1A...Speed command signal, 2
...Speed control device, 3...AC power source, 4...Elevator driving electric motor, 5...Sheave, 6...Railway car,
7... Hanging weight, 8... Main rope, 9... Load detection device, 9A... Load signal, 10... Driving operation unit, 1
0A... Operation command signal, 11... Torque calculation and acceleration/deceleration setting section, 11A... Acceleration/deceleration command signal. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 4 (a) (b) (C)

Claims (3)

[Claims] (1) In an elevator control device that controls elevator operation by controlling the speed of an elevator drive electric motor in accordance with a speed command, a torque calculation means for calculating the necessary torque generated by the acceleration/deceleration motor for each elevator operation. Then, it is determined whether the calculated value calculated by this torque calculation means is within a specified torque value, and the set value of acceleration/deceleration of the speed command is determined on the condition that the calculated value is not within the specified torque value. What is claimed is: 1. An elevator control device comprising: acceleration/deceleration regulating means for changing, so that the torque generated by the electric motor is always within a specified torque value. (2) The elevator control device according to claim (1), wherein the acceleration and deceleration torque settings are changed depending on the unbalanced torque and the operating direction of the elevator. (3) The elevator according to claim (1), characterized in that the acceleration/deceleration torque is calculated only when the unbalanced torque exceeds the specified value of the unbalanced torque up to the vicinity of the balanced torque. Control device.