JPS59182180A - Controller for alternating current 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 The present invention relates to an improvement in a device for controlling an AC elevator.

For example, JP-A-56-1322'75 discloses a system in which an induction motor is used as an electric motor to drive an elevator car, and an inverter supplies alternating current power of variable voltage and frequency to operate the car. ing. and,
Furthermore, a method has been proposed in which countermeasures are taken when an abnormality occurs in the speed command value or the actual speed, and this is shown in FIG.

In the diagram, is (1) a three-phase connection? N is the power supply, (2) is the AC power supply (
(1) is a contact of an operating electromagnetic contactor that is connected to the elevator when it starts and opens when the elevator is stopped; (3) is a converter consisting of a diode that is connected to the contact (2) and constitutes a three-phase full-wave rectifier circuit; ) is a smoothing capacitor connected to the DC side button of the converter, (5) is a transistor connected to the smoothing capacitor (4), and a diode connected in parallel to these, and the constant DC voltage is controlled by pulse width. Variable voltage/
A well-known PWM type inverter converts into variable frequency AC power, (6) is a three-phase induction motor connected to the AC side of the inverter (5), and (7) is a brake coupled to the shaft of the motor (6). A brake shoe (8) is provided facing the outer circumference of the brake wheel (7) and is pressed against the outer circumference of the brake wheel (7) by the force of a spring. (9) is a brake shoe (8) that is pressed against the outer circumference of the brake wheel (7) when energized. ) is separated from the brake car (7), 00 is a driving electromagnetic contactor contact that is connected to one end of the brake coil (9) and operates in the same way as contact (2), and 01) is contact 00 and the brake coil. (9) DC power supply connected to the other end, (1"2 is the drive 11 sheave of the hoist driven by the electric UJ machine (6), (13 is the main rope wrapped around the sheave 02) , 04), Q!9 is the heel and counterweight connected to both ends of the main rope (13), (17) is the electric @h [directly connected to (6), t I/], the rotational speed of the machine (6), i.e. A speed signal (
17a) is a generator for the speedometer, 08) is a current detector that emits a current signal (18a) proportional to the output current of the inverter (5), Ol is a speed command signal, and Kan is a speed command signal 09 and a speed signal ( 17a) an adder for calculating the deviation of 1;
21) is a speed control abnormality detector that outputs an output when the above deviation exceeds a specified value, (A) is a speed control abnormality detection relay that operates with the above output, and (A) is a speed control system connected to an adder. Compensation element, 弼 is a function generator that generates a current command signal ('24a) from the output of the compensation element (to), (gon is the frequency by adding the output of the compensation element (a) and the speed signal (1'7a) An adder that emits a command signal (25a), (a) a reference sine wave current generator that emits a sine wave current command signal (26a) from a current command signal (24a) and a frequency command signal (Z5a), (b) a current The adder that calculates the deviation between the command signal (26a) and the current signal (18a) is an ignition control circuit that issues a conduction signal to the transistor of the inverter (5) according to the deviation.

That is, under normal conditions, the speed abnormality detection relay (a) is energized. At startup, when the operating magnetic contactor contact (2) closes, the converter (3) converts the alternating current of 1) into direct current using the alternating current power supply, and the smoothing capacitor (4) is charged.

In the inverter (5), transistors are switched by a signal button from the ignition control circuit (c) to generate alternating current power of variable voltage and variable frequency in phase order corresponding to the driving direction. On the other hand, since the operating electromagnetic contactor contact 00 is closed at the same time as the start, the brake coil (9) is f[L, and the brake shoe (8) is separated from the brake car (7). The electric motor (6) is now started in the direction determined by the input phase sequence, and the car 04) starts running. A speed signal (17a) proportional to the rotational speed of the electric motor (6), that is, the running speed of the car 04) is converted into a speed command signal 0 by an adder (a).
[phase] and the deviation signal is sent to the torque command signal (or slip frequency command signal) via the compensation element (2). Function generator (2) generates a current command signal (24a) corresponding to the slip frequency command signal. Also, the sum of the slip frequency command signal and the speed signal (1'i'a) is the frequency command signal (
25a). The reference sine wave current generator (c) generates a sine wave current command signal (26a) from the above command signals (24-a) and (25a), and generates a sine wave current command signal (26a) and a current signal (18a).
The ignition control circuit (c) operates the inverter (5) according to the deviation from the
) output. That is, the output current of the inverter (5) is controlled so as to approach the current command signal (26a).

The above method is known as a current-controlled slip frequency control PWM method.

Here, while the car 04) is running, if for some reason the deviation between the speed command signal 01 and the speed signal (]Ja) exceeds the specified value, the speed control abnormality detector Q→ outputs an output, and the speed control abnormality detection relay (b) is deactivated. Now, the electromagnetic contactor for operation is deenergized (the circuit is omitted), and the contact r21
, (+(Th is opened. As a result, the electric motor (6)
Since the input is cut off and the brake coil (9) is deenergized, the brake shoe (8) is pressed by the brake wheel (7) and a braking force is applied, causing the car 04) to come to a sudden stop.

At this time, since the car α chrysanthemum stops almost between the floors, the passengers are trapped inside the car 04).

This invention is intended to improve the above-mentioned problem. When a car stops between floors, if there is no abnormality in the output of the inverter, the car restarts with an output command value different from the normal output command value. It is an object of the present invention to provide a control device for an AC elevator that can significantly reduce the probability of trapping passengers in a car.

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

In the figure, ←) and (→ are DC power supplies, (22a) is the normally closed contact of the speed control abnormality detection relay (A), and (G) is the deviation between the sine wave current command signal (26a) and the current signal (48a). An output abnormality detector that emits an output when it exceeds a predetermined value, 0p is an output abnormality detection relay that operates with the above output, 0 is a switching relay, (32a) is a contact of switching relay 02, and contact (a)
) and contact (b), (c) is an abnormal speed command generator that generates a speed command signal in abnormal conditions, and the trowel generates a voltage command signal and a frequency command signal according to the abnormal speed command signal. Reference voltage reference frequency generator, (c)
is a triangular wave generator that generates a triangular wave, (to) is a contact point (b)
(b) is the cam installed in car 0 (b), and (g) is the Floor, Q
O is an inter-floor detection switch provided in the hoistway and engaged with a cam (B) when car 0■ is between floors □□□ and (G).

Note that each device (g) to (to) constitute an output command value setting device.

Other than the above, the configuration is the same as in FIG. 1.

Next, the operation of this embodiment will be explained.

During normal operation, both the speed control abnormality detection relay (a) and the output abnormality detection relay 01) are energized, the contact (22a) is open, and the contact (31a) is closed, so the switching relay 0
→ is deenergized, and contact (32a) is in contact with contact (a) K.

Therefore, the normal operation is the same as that shown in FIG.

Now, an abnormality has occurred in one of the current control loops such as the ignition control circuit (c), the inverter (5), and the current detector (to).
When the deviation between the current command signal (26a) and the current signal (xsa) exceeds a predetermined value, the output abnormality detector cl outputs an output.

Now, the output abnormality detection relay 0]) is deenergized (the switching relay (a) remains deenergized). When the output abnormality detection relay 01) is deenergized, the electromagnetic contactor for operation is deenergized, the contacts 2) and Qd are opened, and the car 0→
comes to a sudden stop. In this case, it is dangerous to operate Kato 04) immediately, so leave Kato 04) stopped until the inspection is completed.Next, the speed abnormality detection relay (A) and the output abnormality detection relay 6℃ When both are energized, if the deviation between the speed command signal θC and the speed signal (17a) exceeds the specified value, the speed control abnormality detection relay (A) is deenergized and the contact (22a)
is closed. At this time, if the output abnormality detection relay OD detects normality, the contact (31a) is closed, so the switching relay 1ff3 is energized, and the contact (32a) f
Switched to i-contact (b). Therefore, the adder (
Voltage/frequency command signal (3) during abnormal conditions emitted from
6a) is input to the ignition control circuit (c). On the other hand, due to the deenergization of the speed control abnormality detection relay (A), the contact (21, QO) is opened and the car α (A) stops as described above, but the car α (A) is on the floor (C). When it is between (a), the floor detection switch 00 engages with the cam (b) and operates.

Contact (2), QO, then closes again. The electric motor (6) is now controlled in an open loop without using a speed control closed loop, and car 0 runs at a low speed and stops at the nearest floor. Therefore, the probability of trapping passengers inside Katogiku is greatly reduced.

FIG. 4 shows another embodiment of the present invention, which is applied to a voltage controlled slip frequency controlled PWM type inverter.

In the figure, (32b) is a contact that operates in the same way as the contact (32PL), 6 seconds is a function generator that emits a voltage command signal (42a) from a frequency command signal (25a), and (32b) is a function generator that generates a voltage command signal (43a) from a frequency command signal (25a). ) and a reference sine wave voltage generator that generates a sine wave voltage command signal (43a) from the frequency command signal (25a), ■ is a filter that generates a sine wave voltage from the output voltage of the inverter (5), and 2) generates a triangular wave. The triangular wave generator (g) is an adder that calculates the difference between the sine wave voltage command signal (a3a) and the triangular wave.

Other than the above, the configuration is the same as in FIGS. 2 and 3.

Under normal conditions, switching relay contacts (32a) and (32'b) are in contact with contact (a) K.

The reference sine wave voltage generator (goods) generates a sine wave voltage command signal (
43a) is sent to the adder ■, which is compared with the triangular wave,
The difference is given to the ignition control circuit (c) via the contact (32a). The ignition control circuit issues an ignition signal based on the difference, and the output of the inverter (5) is controlled. That is, the output voltage of the inverter (5) is determined by the voltage command signal (aa
It is controlled to approach a). The above method is known as a voltage controlled slip frequency control PWM method.

On the other hand, the voltage command signal (43a) is given to the adder (c) via the contact (32b). Also, inverter (5)
Since the output voltage is a pulse width modulated waveform, the output voltage is converted into a sine wave through the filter θ→ and sent to the adder (A), where it is compared with the voltage command signal (43a).

As explained in Fig. 3, the speed control abnormality detection relay (A) detects an abnormality (contact (22a) closed), and the output abnormality detection relay Op detects normality (contact 1'31a) closed). If so, contacts (32a) and (32b) are contacts (b)
The output voltage of the inverter (5) is controlled according to the voltage/frequency command signal (36a). Now, car 0→ runs at a low speed, but the output of the reference voltage reference frequency generator (goods) and the output of filter θ→ are compared by the adder (a), and the difference is greater than a predetermined value. When this happens, the output abnormality detection relay 0'D is deenergized, thereby opening the contact (2), OO, and stopping the car θ4) to ensure the safety of the passengers.

As explained above, in this invention, when an elevator car driven by an induction motor driven by an inverter stops between floors, if there is no abnormality in the output of the inverter, an output command different from the normal output command value is set. By restarting the car depending on the value, the probability of trapping passengers in the car can be greatly reduced.

In addition, even if an abnormality occurs in the speed control system, if there is no abnormality in the inverter output, car operation will be resumed using the same output command value for each row as above, allowing rescue operations to ensure the safety of passengers. can do.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing a conventional AC elevator control device, FIG. 2 is a block circuit diagram showing an embodiment of the AC elevator control device according to the present invention, and FIG. 3 is a circuit diagram of a switching relay. FIG. 4 is a block circuit diagram showing another embodiment of the invention. (3)...Converter, (5)...Inverter,
(6)...three-phase induction motor, 04)...elevator car, αη...speedometer generator, 0 mark...current detector, OI...speed command signal, wire...・Adder, (C)...Function generator, (C)...Adder, (B)...
・Reference sine wave current generator, (a)...adder, (7)...ignition control circuit, (7)...output abnormality detector,
0])...output abnormality detection relay, 0bout...switching relay, (g)...abnormal speed command generator, ■...reference voltage reference frequency generator, (to)...triangular wave Generator, (7)...Adder Note that the same reference numerals in the drawings indicate the same parts. Agent Shin Kuzuno - (1 other person) Figure 1

Claims (2)

[Claims] (1) In a system in which AC power is converted to DC, this is converted to AC by an inverter controlled according to the output command value, and the converted AC is used to drive an induction motor to operate the car, the above output An output abnormality detection device that compares the command value and the output of the inverter and operates when the difference exceeds a predetermined value; an output command value setting device that issues a second output command value different from the output command value; A stop detection device that operates when the stop detection device is stopped between floors, and a switching circuit that provides the second output command value to the inverter if the output abnormality detection device is not operating when the stop detection device operates. An AC elevator control device characterized by: (2) In a system in which AC power is converted to DC, this is converted to AC by an inverter controlled according to the output command value, and the converted AC is used to drive an induction motor to operate the car, the above output An output abnormality detection device that compares the command value and the output of the inverter mentioned above and operates when the difference exceeds a predetermined value, and a speed control abnormality that compares the speed command value and the actual speed of any of the above and operates when the difference exceeds a predetermined value. a detection device, an output command value setting device that issues a second output command value different from the output command value, a stop detection device that operates when the above-mentioned dowel stops between floors, and a stop detection device that operates when the stop detection device operates. If the speed control abnormality detection device operates and the output abnormality detection device does not operate, the second
A control device for an AC elevator, comprising a switching circuit that provides an output command value.