JPS5950588B2 - Elevator speed reference command generator - Google Patents

Description

[Detailed description of the invention] The present invention relates to an elevator speed reference command generation device.

Generally, when decelerating an elevator using a speed feedback control method to obtain good ride comfort and landing characteristics, it is necessary to accurately measure the position of the car. A device that operates the system is installed inside the hoistway.

A speed reference command is generated based on the output signal of this proximity switch, and speed feedback control is performed by comparing this speed reference command with the output of a speed generator coupled to the elevator driving motor.

That is, as shown in FIG. 1, elevator car 1 (
When decelerating and stopping an elevator (hereinafter abbreviated as "elevator"), a detector 2 installed in the hoistway sequentially operates a position detector 3 consisting of a proximity switch.
The signal is sent to the speed control device 5 through the tail cord 4.

The speed control device 5 generates a speed command pattern according to the output of the position detector 3, that is, the position of the elevator, compares this pattern with the output of the speed detector 6 consisting of an AC speed generator, and calculates the difference as a control variable. As elevator drive electric motor 7
and controls the elevator.

By the way, in a conventional 5Qm/min class elevator, if the average deceleration is about 0.5m/5ec2,
The deceleration distance is about 1 m, and this length is the limit for mounting the position detector 3 directly on the car 1, and it is structurally difficult to extend the deceleration distance to further reduce the deceleration. Ta.

Furthermore, in elevators with a speed of 90m/min or more,
It became necessary to prepare another device such as a floor controller, which increased costs.

Furthermore, as the deceleration distance increases, the number of position detection proximity switches also increases, which increases cost and reduces reliability.

An object of the present invention is to provide an elevator speed reference command generation device that can freely set the deceleration distance with a simple configuration without having to provide several position detectors such as proximity switches, while eliminating the drawbacks of the prior art described above. It is in.

To achieve this objective, the present invention detects only the deceleration start position of the elevator using a position detector placed in the hoistway, and then generates a speed reference command according to the deceleration position. An AC speed generator rotated through the rotating shaft of the electric motor is provided, the output of this AC speed generator is pulsed, the pulses are counted after the deceleration start position is detected, and the travel distance of the elevator is determined. The present invention is characterized in that an elevator speed reference command is generated in accordance with a count value indicating a distance.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In these figures, the same reference numerals as in FIG. 1 indicate the same or equivalent parts.

This embodiment differs from the conventional system in that, as shown in FIG. The running distance detector 9 obtains the speed feedback signal from the output of the AC speed generator 6 directly connected to the electric motor 7, and the speed reference pattern is generated by the speed reference pattern generation circuit 51.

On the other hand, the output of the alternating current generator 6 is rectified by a rectifier 52 as a speed feedback signal, compared with the speed reference pattern as is well known, and the motor 7 is feedback-controlled by a phase shifter 53 and a power supply device 54. do.

Since the AC speed generator 6 is directly connected to the elevator driving electric motor 7, its output voltage is generated according to the rotation of the electric motor 7, and there is a fixed relationship between the rotation of the electric motor 7 and the travel distance of the elevator 1. .

Therefore, by integrating the number of output pulses of the AC speed generator 6, the travel distance of the elevator can be detected.

That is, as shown in FIG. 3, the zero-volt point of the AC generated voltage of the AC speed generator 6 is detected by the zero-cross detection device 10 (for example, a zero-volt switch), the waveform is shaped by the waveform shaping circuit 11, and the counter 12 counts. This allows the distance traveled by the elevator to be detected.

Note that the output of this counter 12 is input to an output circuit 13.

FIG. 4 is an explanatory diagram of the operation of the traveling distance detecting device shown in FIG. 3. FIG. 4A is a speed diagram when the elevator decelerates and stops, and FIG. FIG. 4C shows the output pulse train of the waveform shaping circuit 11.

Although only the positive half wave is pulsed here, if distance detection accuracy is required, the accuracy can be doubled by using the positive and negative full waves.

As shown in FIG. 5, the pulse of FIG. 4C starts counting by the counter 12 when the output of the deceleration start detector 8 comes out, and when the counter 12 reaches a predetermined count output, the gate circuit 14, the output corresponding to each setting is taken out.

In the gate circuit 14 in FIG. 5, (Q1+Q2)
, (Q2 + Qa), (Q4 + Qs) each 2
When the sum of the number of pulses in the forward counter output is reached, each gate provides an output, driving transistors 15-17 and operating distance detector output relays 18-20.

In addition, in FIG. 5, 21 is a deceleration start contact.

Here, the output of the counter 12 is 2
Since the value is displayed as a digital value and is a relative distance value, the target distance can be set using the gate circuit 14.

In other words, one pulse corresponds to the motor rotation speed, the hoisting machine reduction ratio,
Sheepdia, 2mm calculated from the number of AC speed generator poles
In this case, the 150th pulse can be taken out by the counter 12 and the gate circuit 14 to measure a point 300 mm from the deceleration start point.

Next, a converter for converting the output of the traveling distance detector 9 into a speed pattern will be explained with reference to FIG.

The DC power supply 22 is divided into voltages by resistors 23 to 27, and the respective divided voltages are charged to capacitors 28 to 31 by the deceleration start contact 21 and the contacts 18' to 20' of the mileage detector output relays 18 to 20. There is.

Now, assuming that the elevator is running as shown in FIG. 7A, the contacts 21 and 18'
~20' is ONj.

When the elevator reaches the deceleration start point, the travel distance detection device shown in FIG. 3 starts operating, and at the same time deceleration start contact 2
1 turns OFF.

As a result, as shown in FIG. 7C, the capacitor 28
is discharged through resistor 32 to the voltage of capacitor 29.

Thereafter, as the counter 12 operates in sequence, the gate circuit 14 operates, contacts 18' to 20' are turned off, and a speed pattern as shown in FIG. 7C is generated at the output terminal 33.

Further, the other side of the converter is shown in FIG.

In this example, the voltage of the DC power supply 22 is divided by resistors 34 to 38,
In place of the contacts shown in FIG. 6, an electronic switch group 43 (transistors, integrated circuits, etc.) consisting of electronic switching elements 39 to 42 is used, and this is operated by a gate circuit as shown in FIG. 9A.

As a result, a step voltage as shown in FIG. 9B is generated at the input resistor 45 of the operational amplifier 44.

This voltage becomes a voltage as shown in FIG. 9C by an integrator composed of an operational amplifier 46 and a capacitor 47.
A voltage similar to the speed command voltage shown in FIG. 7C is obtained.

According to this method, since a relay is not used, reliability can be improved.

As explained above, according to the present invention, only the deceleration start position of the elevator is detected by the position detector disposed in the hoistway, and then when a speed reference command corresponding to the deceleration position is generated, the elevator drive An AC speed generator rotated through the rotating shaft of the electric motor is provided, the output of this AC speed generator is converted into pulses, the pulses are counted after the deceleration start position is detected, and the travel distance of the elevator is determined. Since the elevator speed reference command is generated according to the count value that indicates the travel distance, the number of position detectors such as proximity switches installed in the hoistway can be reduced, improving the reliability of the equipment. At the same time, it becomes possible to freely set the deceleration distance to be long, thereby improving the ride comfort of the elevator.

Furthermore, since the deceleration start position is directly detected in the hoistway, high landing accuracy can be achieved without being affected by counting errors during travel.

Furthermore, since it is only necessary to provide an AC speed generator that is rotated through the rotating shaft of the elevator drive electric motor, no special space is required to install it, and the configuration is simple, making the device easy to use. It can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional speed reference command generation device, FIG. 2 is a block diagram of a speed reference command generation device according to an embodiment of the present invention, FIG. 3 is a block diagram of a traveling distance detection device, and FIG. Figures A to D are explanatory diagrams of the operation of the mileage detector shown in Figure 3, Figure 5 is a wiring diagram showing a specific example of the output circuit, and Figure 6 is a diagram showing how the output of the mileage detector is changed to a speed pattern. A wiring diagram showing one specific example of the converter, FIG. 7 A-C is an explanatory diagram of the operation of the converter shown in FIG. 6, FIG. 8 is a wiring diagram showing another specific example of the converter, and FIG. 9 AC is an explanatory diagram of the operation of the converter shown in FIG. 8. Explanation of symbols, 1...P...Elevator car, 5...
...Speed control device! J6..., -... AC speed generator, 7... Elevator driving electric motor, 8...
...Deceleration start detector, 9...Midage distance detector,
10...Zero cross detector, 11...
Waveform shaping circuit, 12... Counter, 13...
...Output circuit.

Claims (1)

[Scope of Claims] 1. A device that generates a deceleration reference command according to the deceleration position after detecting the deceleration start position, which comprises: a position detector disposed in an elevator hoistway to detect only the deceleration start position; an AC speed generator rotated via a rotating shaft of a drive motor; a device that pulses the output of the AC speed generator; and a device that inputs the output of the position detector and the pulse, and detects the deceleration start position. An elevator speed reference command generation device comprising: a device for counting the subsequent pulses; and a device for outputting an elevator speed reference command according to the count value of the pulses. 2. The elevator speed reference command generation device according to claim 1, characterized in that a speed feedback signal AC speed generator is used as the AC speed generator. 3. The device for pulsing the output of the AC speed generator includes:
2. The elevator speed reference command generation device according to claim 1, comprising a zero-crossing detection device for detecting a zero-crossing point of the output of the generator and a waveform shaping circuit. 4 The device that outputs the speed reference command includes a resistor that divides the DC voltage, an electronic switchgear that operates according to the count value of the pulses and creates a step-like signal, and an input device that receives the step-like signal. and an integrator that outputs an elevator speed reference command.
The elevator speed reference command generation device described in .