JPS60218272A - Elevator speed control device - 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] This invention incorporates the output of a load detector when the door is closed and on standby (no load) into a CPU, calculates the difference from the set value, and uses it as a correction input to adjust the scale output. The present invention relates to an elevator speed control device that performs correction.

[Prior art]

The configuration of a conventional elevator load detector is shown in FIG.

7 in this figure 1 is an elevator car with anti-vibration rubber.
3 is a horseshoe-shaped spring for load detection, and the amount of deflection of this spring 3 is detected by a differential transducer. The differential transducer is installed in the basement S of the hoistway.

During this detection, when a passenger gets into the car, the spring 3 is deflected according to the weight of the passenger, and the differential transducer outputs an output corresponding to the deflection, which is sent to the speed control device (not shown) as a scale signal. It will be done.

By the way, the spring 3 begins to loosen over time, which changes the output of the differential transducer, causing so-called scale shift. To prevent this, it was necessary to periodically adjust the differential transducer.

[Summary of the invention]

This invention was made for the purpose of improving such drawbacks, and the output of the load detector when the door is closed and waiting is taken into the CPU.
We propose an elevator speed control device that corrects the scale output by calculating the difference from the set value and using it as a correction input, so that the scale does not shift even if the output of the load detector changes over time. .

[Embodiments of the invention]

Embodiments of the elevator speed control device of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of one embodiment. In this figure 2, 6
is an alternating current power source, and this alternating current! The alternating current voltage of m& is converted into a direct current voltage by a converter t, and after smoothing this direct current voltage by a smoothing capacitor g, it is applied to an inverse converter 9.

The inverter 9 converts this DC voltage into AC voltage and converts it into an AC voltage.
The output current of this inverter 9 is applied to a two-layer induction motor ll, and the output current of this inverter 9 is applied to a current detector i.

The detection output is PWM (Pulse Width Variation II)
It is designed to output to the modulation circuit S.

The car is run by the hoisting induction motor//, and the rotational speed of the hoisting induction motor// is detected by a speed detector, whose detection output is sent to an interface circuit (hereinafter referred to as /, It is set to be sent on /9.

Further, the car /l is connected to a balance weight /S by a pulley lobe /A so as to maintain balance, and the pulley rope 16 is driven by a beam wheel 13. This linear wheel 13 is driven by a hoisting induction motor/l.

On the other hand, Coro is a microprocessor for controlling the inverter t, and the output of the differential transducer shown in Figure 1 is I/,
Microprocessor -〇 (hereinafter referred to as CPU)
).

In addition, the contact point Koda generates a starting signal for the elevator (its coil is not shown), and this starting signal I
It is designed to be taken into the CPU 20 through /F1g, and the output of the speed detector / is also taken into the CPU 20 through "/" and /q.

1/ and 2 are ROM and RAM, respectively, which constitute the memory circuit of the CPU 0. ROM 1 stores programs and fixed value data, and RAM
This is used to temporarily store the data of the calculation results of UcoO.

These ROMJ/RAM-1 also exchange data with the CPU.

Further, D7.D3 outputs a scale current command value based on the calculation result of the CPU D7. A PWM modulation circuit compares the output of this multi-tele converter 3 and the output of the current detector IO to apply PWM modulation. This PW
PWM modulation is applied to the inverse converter 9 by the power of the M modulation modulation circuit.

Next, the operation of the elevator speed control device of the present invention configured as described above will be explained.

When the elevator starts, the output of the differential transducer is taken into the CPU via the I/F/R, and is calculated. Output to converter 3.

This sea converter S converts the output of the CPU S into an analog signal and outputs a scale current command to the PWM modulation circuit. PWM modulation modulation circuit Col7. The output of the converter 3 and the output of the current detector IO are compared and PWM modulation is applied to control the inverse converter t, and based on this, the hoisting induction motor l/
A balance current flows through.

Additionally, if no elevator calls are made for a long time, the elevator will automatically stop. At this time, the elevator is on standby with its doors closed, and the inside of car II is always unloaded.

FIG. 3 is a flowchart showing the calculation method of the microprocessor-6 according to the present invention. In FIG. 3, when the automatic body is stopped, the contact 21I in FIG. 2 is opened by the step roller. By this, it is determined whether the contact Koda is closed or not, and if it is released, step 27
The difference (ΔI) from the set value (Ia6) stored in the differential transducer ROM, 2/ is recorded in the step controller g, and the second
It is stored in the RAM shown in the figure, and when the elevator starts next time, the output (Ia) of the differential transformer is calculated using the CPU as a current command signal, and the D/A D7. Converter 3 output and current detection Hii
It compares the output with the output of , performs PWM modulation, and outputs it to the inverse converter 9, thereby causing a current to flow through the hoisting induction motor /l.

By the way, the change over time of the spring 3 shown in FIG. 1 appears as a deflection of the spring, and the spring constant has a characteristic that it does not change much. Therefore, when the spring 3 changes over time, the output 1/d of the differential transducer is (I'd=Ia+
ΔIa).

ΔI=IIIo Ia Therefore, ΔIWIa0− (Ia+ΔIa) Therefore, the scale current command signal is IW=■'d+Δ■ =Id+ΔI4+l−0−(I4+Δl4)=I,.

The value becomes the same as before the change, and the scale current command signal can be corrected. In this way, scale misalignment can be prevented.

FIG. 4 shows another embodiment of the present invention, in which the same parts as in FIG.
I will focus on the parts that differ from the diagram. In this Fig. 4, the contact point Koda in Fig. 2 and '/, / ff
is omitted, and the output of the speed pattern generator 9 is newly taken into the CPU 0 through the I/F 3θ.

FIG. 5 is a block diagram showing the speed control calculation performed by the microprocessor 6, and FIG. 6 is its flowchart. This is used as a correction signal for the scale.

First, the state before the elevator stops will be described. Take the difference between the output 9a of the speed pattern generator 29 and the output 9a of the speed detector 1 and the output /?a passed through ``/, /9, and calculate P
The torque command J/a is calculated by the I calculation unit 31, and the output lIa of the differential transducer is added as compensation human power.

The sum of this torque command 3/a and the output 11a of the differential transducer is input to three current value calculation calculators, and the current value calculation calculator 3.2 outputs the sum as a current command 32a via the Roux converter 3. is output.

By the way, when the elevator runs and reaches the destination floor, the car holder is stopped electrically and then the mechanical brake is applied. At this time, the torque command J/a is the first
In the figure, a torque command equal to the unbalanced torque between the car holder and the counterweight IS is issued.

Therefore, if the output of the PI calculator 31, that is, the torque command 3/a, is assumed to be ■, and the sum of the two is expressed as If it is equal to the torque, It=Ia Tona'), P I calculation 'a3/ output I
.

teeth ■, becomes ;0.

However, when the load detection spring 7 changes and the output 4Ia of the differential transducer changes, and I', = Id + ΔId, I'T = I P + I'd.

However, since the unbalanced torque applied to the hoisting term conductive motor // does not change, I', = I.

becomes. Therefore, I,=-ΔId, and the output of the PI calculator 31 compensates for the change in the output la of the differential transducer. Thereby, by storing the output of the PI calculator 3/ at this time, it is possible to correct the error of the differential transducer.

When making this correction, in L1100, step S/
If the speed of the car is zero, proceed to step S-,
If the output of the PI calculator 31 is not zero, the process advances to step S3, and the output 3/a of the PI calculator 3/ is sent to the CPU controller.
It is stored in RAM here. If the elevator is stopped in step S, the output 3/a of the PI calculator 31 is used as a correction signal for the scale in step St.

〔Effect of the invention〕

As explained above, in this invention, the output of the load detection means when the door is on standby with the door closed is input into the microprocessor, the difference with a predetermined value is calculated, and the result is recorded in the memory circuit tJ]fL, and the elevator scale is activated. Since the output of the load detection means is sometimes corrected by the output of the storage circuit, even if the load detection means changes over time and its output changes over time, the scale will not shift.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a general load detector for an elevator, FIG. 2 is a block diagram showing the configuration of an embodiment of the elevator speed control device of the present invention, and FIG. 3 is a diagram showing the configuration of an elevator speed control device of the present invention. FIG. 4 is a block diagram showing the configuration of another embodiment of the elevator speed control device of the present invention, and FIG. 5 is a flowchart showing the calculation method of the microprocessor in the speed control device of the invention. FIG. 6 is a block diagram of the part of the microprocessor in the device that performs speed control calculations, and FIG. 6 is a flowchart showing the flow of operations when correcting errors in the differential transformer using the microphone 010 setter in the elevator speed control device shown in FIG. be. 3... Spring for load detection, D... Differential transformer, 6
...AC power supply, ri...converter, t...inverse converter,
10...Current detector, //...Winding conductor motor, Lco...Speed detector, 13...Connection wheel, lda...
・Basket, -〇...CPU-/...ROM, -1...
・RAM%-3...I2//A conversion starvation S...PW
M modulation circuit, 9...speed pattern generator, 31...
・PI calculator, 3 pieces...Current value calculation calculator. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others) Figure 3 Figure 4 Procedural amendment (voluntary) Showa Year Month Day 2 Name of the invention Elevator speed control device 3 To the person making the amendment Representative Katayuni Department 4 Acting on behalf of the person making the amendment Person 5, Subject of amendment (1) Detailed explanation of the invention in the specification column 6, Contents of amendment

Claims (2)

[Claims] (1) A load detection means that detects the deflection of a load detection spring installed under the elevator car as the load inside the car, and the output of the load detection means is taken in when the elevator is waiting for the door to be closed. comprising a microprocessor that calculates the difference from a predetermined value, stores the calculation result in a storage circuit, and corrects the output of the load detection means based on the value stored in the storage circuit when the elevator starts the scale. Elevator speed control device. (2) The microprocessor sensor outputs the torque command of the microprocessor and the output of the load detecting means when the elevator has reached the floor and the car is stopped, instead of the output of the load detecting means when the elevator is waiting with the door closed. Claim 1, characterized in that the difference is calculated, the calculation result is stored in the storage circuit, and the output thereof is used as a correction signal for the scale.
1. Elevator speed control device as described in .