JP2504468B2 - Elevator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a rescue operation device for an elevator.

(Prior Art) In recent elevators, when there is a power outage, the elevator stops in the middle of the floors and traps passengers, so that passengers are not anxious. Many are equipped with automatic landing equipment during a power failure to drive and land on the nearest floor to rescue passengers.

The outline of the structure is shown in FIG. 1 is a commercial power supply, 2 is an electric motor control device, 3 is a main circuit contactor, 4 is an electric motor, 5 is a main sheave, 6 is an elevator car, 7 is a counter weight, 8 is a battery power supply, 9 is a floor landing device during a power failure, Reference numeral 10 is an operation contactor during a power failure.

Hereinafter, this operation will be described. In normal elevator operation, the required electric power source 1 and the electric motor control device 2 drive the electric motor 4 through the main circuit contactor 3 to operate the elevator. On the other hand, when the commercial power supply 1 fails, the main circuit contactor 3 is disconnected and the operation contactor 10 during a power failure is turned on, and the battery power supply 8, the landing device 9 during a power failure, and the operation contactor 10 during a power failure.
Drives the electric motor 4 to drive the elevator to the nearest floor. Further, the control power supply of the electric motor control device 2 is given from the battery power supply 8 via the floor contact device 9 during a power failure. However, when a power failure occurs, it takes time until the contactors 3 and 10 are switched and the elevator operation control is switched from the control device 2 to the rescue operation device 9 after the power failure is detected. During the time required for the elevator, the elevator was braked once and stopped, and the rescue operation was started after the switching was completed.

(Problems to be solved by the invention) As described above, the elevator will stop once until the rescue operation is started after the power failure occurs, which causes anxiety to passengers and further takes time for this switching. And the passengers' anxiety was increased.

It is an object of the present invention to provide a rescue operation control device for an elevator that can be rescued without causing anxiety to passengers by minimizing the time for switching to rescue operation after a power failure as described above.

[Structure of Invention]

(Means for Solving Problems) In the present invention, a power conversion device that exchanges AC power from a commercial power source to supply power to an electric motor of an elevator, a power failure detector that detects a power failure of the commercial power source, and a power failure time A standby power supply device for supplying electric power to the power conversion device, and a direction position detection means for detecting the elevator operation direction and position immediately before the power failure,
Control means for rescue operation that outputs speed command during power failure according to the elevator operating direction and position immediately before this power failure, and power conversion device is controlled by the speed command during normal time during normal operation, and power is supplied by speed command during power failure during power failure. It is characterized by having elevator control means for controlling the conversion device and power supply means for supplying electric power from the power supply device to the direction position detection means, the rescue operation control means and the elevator control means at the time of a power failure.

(Operation) In the configuration as described above, in the normal time, the power conversion device is controlled by the normal time speed command, the AC power from the commercial power source is converted, the electric motor is driven, and the elevator is controlled.

At the time of a power failure, power is supplied to the power converter from the standby power supply, and power is also supplied to the direction position detecting means, the rescue operation control means, and the elevator control means. The power converter is controlled by a speed command during power failure according to the elevator operation direction and position immediately before the power failure. The elevator is operated to the nearest floor without being stopped between floors due to a power failure.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a commercial power source, 2 is an electric motor control device, 4 is an electric motor, 5 is a main sheave, 6 is an elevator car, 7 is a counter weight, and 12 is a rescue operation control circuit. A continuous power failure monitoring circuit 10 is installed in the rescue operation control circuit 12.
Is provided to detect the direction and position of elevator operation immediately before a power failure. A power failure detection relay 11 detects a power failure of the commercial power supply 1. 17 is a speed detector, which is an elevator car 6
Detect the speed of. 21 is a brake, which brakes the elevator when the register is exhausted. Reference numeral 16 is a battery power source of the constant power failure monitoring circuit 10 in the rescue operation control circuit 12.

The motor control circuit 2 is mainly composed of a power converter that converts AC power of the commercial power supply 1, a main circuit contactor 33, a rectifier 32 in which diodes are bridge-connected, a smoothing capacitor 31 and a voltage detector provided in a DC circuit. 34, an inverter 26 in which transistors are bridge-connected, a regenerative power absorption circuit 27 that absorbs regenerative energy, and an elevator control circuit 25. The DC circuit of the motor control circuit 2 is provided with a circuit including a battery power source 35, a contactor contact 36a, and a blocking diode 37 for preventing backflow, and supplies power to the main circuit in the event of a power failure.

Each of the elevator control circuit 25, the rescue operation control circuit 12, the speed detector 17, and the brake 21 has a battery power source 2
A circuit including 8,13,18,22, relay contacts 29a, 14a, 19a, 23a, and blocking diodes 30, 15, 20, 24 is provided to supply power when a power failure occurs.

39 is a current detector for detecting the electric motor current, 38 is a door zone and landing zone detector, and 53 is a car load detector.

 Next, the operation of this embodiment will be described.

In the case of normal elevator operation, the AC power from the commercial power supply 1 is converted into DC power by the rectifier 32, and this DC power is converted into AC power by the inverter 26 controlled by the output signal of the elevator control circuit 25 to drive the motor 4 To drive the elevator.

When a power failure detection relay 11 detects a power failure at the time of a power failure, the battery power sources 28, 13, 18, 22 drive the elevator control circuit 25, the rescue operation control circuit 13, the speed detector 17, and the brake.
Power is supplied to 21. The elevator control circuit 25 controls the inverter 26 with a speed command at the time of power failure according to the elevator operating direction and position immediately before the power failure, drives the electric motor 4, and drives the elevator car 6 to the nearest floor to land. After the occurrence of a power failure, the main circuit power supply is only the charge stored in the capacitor 31, but the voltage detection relay 34 detects that the main circuit voltage has dropped and reached the same voltage as the battery power supply 35,
Power is supplied from the battery power supply 35 to the main circuit to continue operation. Since the brake 21 is also supplied with power from the battery power source 22, the brake is not applied when a power failure occurs, and the elevator car 6 continues to move due to inertia.
FIG. 2 shows the configuration of the constant power failure monitoring circuit 10 provided in the rescue operation control circuit 12 of FIG. In FIG. 2, 11
b is a break contact of the power failure detection relay 11 in FIG. 1, 14 is a power supply relay for the rescue operation circuit, 19 is a power supply relay for the speed detector, and 29 is a power supply relay for the elevator control device. , 23 is a relay for supplying power to the brake 21,
38 is a make contact of a relay that is excited when a brake release command is output in the elevator control circuit 25, 36 is a contactor that supplies battery power for the main circuit, and 34b is battery power for the main circuit voltage of the main circuit This is the break contact of the detector that is excited when the voltage exceeds 35. 40a is a make contact of the relay excited when the direction is selected by the elevator control circuit 25, 41a is a make contact of the relay excited when the UP direction is selected by the elevator control circuit 25,
42 is a relay that is excited when the UP direction is selected,
42a is a make contact of the relay 42, 43a is an elevator control circuit
25 is a make contact of the relay that is excited when the DOWN direction is selected, 44 is a relay that is excited when the DOWN direction is selected, and 44a is a make contact of the relay 44. 45 is a relay that is excited when the UP or DOWN direction is selected during a power failure, 46a is a make contact of the relay that is excited when the elevator car 6 is in the door zone (approximately ± 200 mm of the landing level), 47 Is a relay that is excited when in the door zone, and 48a is a relay that is excited when the elevator car 6 is in the landing zone 1 (about ± 20 mm of the landing level).
Reference numeral 50 is a relay energized when the car 6 is out of the door zone during a power failure, and 51 is a relay energized when the car 6 is out of the landing zone within the door zone during a power failure.

FIG. 3 is a block diagram showing the configuration of the elevator control circuit. 45c is a FET that conducts when the relay 45 is excited
It is an electric switch, etc., and is energized when the direction is selected during a power failure. 45d is an electric switch that conducts when demagnetized. Reference numeral 58 is a speed command circuit that generates a speed command during normal operation, and 59 is a speed command circuit that generates a speed command during a power failure. 52 is a speed control amplifier, 53 is a load detector in the elevator car, 54 is a load adder in the elevator car, 55 is an AC motor current signal calculator for vector control, 56 is a current control amplifier, 57 is an inverter drive circuit Is.

FIG. 4 shows a concrete configuration of the speed command generation circuit 59 at the time of power failure in FIG. In FIG. 4, 60, 61, 74 are variable resistors, 62, 63, 69 to 73 are resistors, 68 is a constant voltage diode, 75
Is a capacitor, 64 to 67 are operational amplifiers, 50c is an electric switch that becomes conductive when the relay that is excited when in the door zone at the time of 50 power failure is energized, and 51c is conductive when 51 relays are also excited. The switch 42c is an electrical switch 42c, and 42c is an electrical switch that is conductive when the relays 44 are excited.

Normal elevator operation In the circuit shown in Fig. 2, the relay 45 that is energized when the direction is selected during a power failure is not energized, so the switch 45d shown in Fig. 3 is in the conducting state, and the speed command in the elevator controller is indicated. It is controlled according to the speed command value of the generator 58. In this case, the speed command signal is compared with the speed feedback of the elevator speed detector 20 and the deviation is amplified by the speed control amplifier 52, and the load detector
The load signal of the in-car load of 53 is added, the current reference signal is output by the current signal calculator 55 according to the torque reference, this is compared with the feedback signal of the motor current detector 39, and the deviation is amplified by the current control amplifier 56. The inverter main circuit 26 is controlled by the inverter control circuit 57 and the electric motor 4 is controlled according to the speed reference.

If a power failure occurs here, the power failure detection relay shown in Fig. 1
Since 11 is demagnetized and the break contact 11b shown in FIG. 2 is closed, the relays 14, 19, 29 are excited and the rescue operation control circuit 1
2. The power source is connected to the elevator speed detector 17 and the elevator control circuit 25. At this time, when the elevator is in operation and the brake 21 is open, the contact 38 is closed, so the relay 23 is also excited and the battery power source 22
Is connected and the brake continues to release.

Next, the operation when the elevator is operating in the UP direction outside the door zone before the power failure will be described. In this case, since the direction has been selected, contact points are shown in FIG.
40a is turned on. In addition, since it is the UP direction, contact 41a
Since the relay is also turned on, the relay 42 is in the excited state, and the direction selection relay 45 at the time of power failure is also excited. Therefore, the third
The switch 45c shown in the figure becomes conductive and the switch 45d becomes non-conductive. As a result, the speed command is switched to the power failure speed command generation circuit 59. Elevator car 6 here
2 is outside the door zone, the relay 50 shown in FIG. 2 is excited and the switch 50c shown in FIG. 4 becomes conductive. In this case, the voltage set by the variable resistor 60 and the resistor 62 is the operational amplifier.
Entered in 64. Here, the constant voltage diode 68 functions as a limiter, and when this input voltage exceeds the voltage of the constant voltage diode, it is limited to that value. Further, this output is integrated by an integrating circuit composed of an operational amplifier 66, a variable resistor 74, a resistor 71, and a capacitor 75.
A feedback circuit consisting of 70 and 69 increases to the value of the input voltage. When the pattern created in this way is the UP direction selection, the switch 42c is in the conductive state, and therefore is input to the speed control amplifier 52 of FIG. 3 through the switch 42c and the switch 45c. The following is controlled similarly to the normal elevator operation operation. However, since the main circuit does not have a power supply, only the electric charge stored in the capacitor 31 is used and the main circuit voltage decreases. If this is detected by the voltage detection relay 34 and demagnetized when the voltage of the backup battery power supply 35 drops to the voltage of the backup battery power supply 35, the contactor 36a shown in FIG. 2 is turned on when the main circuit becomes the same voltage as the backup power supply. Power is supplied to the circuit from the battery power supply 35, and operation can be continued. In this case, the speed command value for the rescue operation needs to be set to a speed at which the battery voltage can be used for operation. Usually 1 of AC motor
In order to obtain the same torque in the next frequency control, it is necessary to control the ratio V / f of the supplied voltage V and the operating frequency f to be constant, so the main circuit battery voltage V _B and the rescue operating speed S _B
Is required to set S _B in the relation of V _B / S _B ≧ V _N / S _N with respect to the DC voltage V _N during normal elevator operation and the rated speed S _N. In this way, when the operation is continued and enters the door zone, the relay 47 is excited, the relay 50 is demagnetized, the relay 51 is excited, and the switch 51c is turned on. In this case the variable resistor 61,
The voltage set by the resistor 63 is input. This set voltage is set lower than the set voltage of the variable resistor 60 and the resistor 62 described above. Then the speed command pattern goes down, the speed goes down, and the relay 49 is excited when it enters the landing zone,
The relay 51 is demagnetized, the switch 51c becomes non-conductive, and the speed command becomes zero. At the same time, the relay 23 is demagnetized, the brake is applied, and the elevator is stopped. In this way, the elevator continuously shifts to the rescue operation and ends the rescue operation. FIG. 5 shows the voltage waveforms at points and in FIG. 4 in this case. Relays even when the elevator was operating DOWN
42 replaces the operation of the relay 44, and since the speed command pattern passes through the inverting amplifier composed of the operational amplifier 67 and the resistors 72 and 73, the polarity is reversed and the same operation is performed. If a power failure occurs in the door zone while the elevator car 6 is outside the landing zone, it will move in the low voltage pattern set by the resistor 63 and the variable resistor 61. If there is, it will not be performed.

When a power failure occurs when the elevator is in the operating state as described above, the control circuit is immediately backed up by the backup power source, and the operation speed command is switched to the rescue operation pattern in the operation direction before the power failure. The passenger can be rescued by shifting to the rescue operation without stopping the elevator, and the anxiety of the passenger can be minimized to improve the service.

〔The invention's effect〕

Advantageous Effects of Invention According to the present invention, it is possible to provide an elevator rescue operation device capable of performing a rescue operation after a power failure occurs without stopping the elevator to minimize the anxiety of passengers.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
A concrete circuit diagram of the constant power failure monitoring circuit in the figure, FIG.
The concrete block diagram of the elevator control circuit in the figure, FIG. 4 is the concrete circuit diagram of the speed instruction circuit at the time of power failure in FIG. 3, and FIG.
FIG. 6 is a voltage waveform diagram of each point in FIG. 4, and FIG. 6 is a configuration diagram showing a conventional elevator rescue operation device. 1 ... Commercial power supply, 4 ... Electric motor 6 ... Elevator car, 10 ... Constant power failure monitoring circuit 11 ... Power failure detection relay 12 ... Rescue operation control circuit 25 ... Elevator control circuit 13, 16, 28, 35 ... Battery power supply 14a, 29a ... Relay contact, 36a ... Contactor contact

Claims (1)

(57) [Claims] 1. A power converter for exchanging AC power from a commercial power supply to supply power to an electric motor of an elevator, a power failure detection circuit for detecting a power failure of the commercial power supply, and power for the power converter at the time of power failure. Standby power supply device, direction and position detection means for detecting the elevator operating direction and position immediately before a power failure, and rescue operation control means for outputting a speed command at power failure according to the elevator operating direction and position immediately before the power failure, An elevator control means for controlling the power converter by a speed command during normal operation, and an electric power converter by a speed command during power failure from the rescue operation control means during a power failure, and the directional position detecting means during a power failure And an electric power supply unit for supplying electric power to the rescue operation control unit and the elevator control unit. apparatus.