JPS61112537A - Elevator controller - 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 [Field of Application of the Invention] The present invention relates to an elevator control system, and more particularly to an elevator control system that controls an elevator drive induction motor using a frequency conversion device.

[Background of the invention]

2. Description of the Related Art An emergency operation device for driving passengers to the nearest floor and rescuing passengers when an AC power supply for driving an elevator is out of power is known, for example, as described in Japanese Patent Application Laid-open No. 183576/1983.

According to this technology, in the event of a power outage, the power control device can be operated using the battery as a power source, and the elevator drive inverter can be controlled to perform emergency operation. Therefore, there is no need to separately provide an expensive emergency operation device as in the conventional case, so the emergency operation device can be easily provided.

That is, in the event of a power outage, a power control device is used that includes a battery, a plurality of transistors, a transformer having primary and secondary windings, and a rectifier provided on the secondary side of the transformer. Outputs are alternately applied to the bases of the plurality of transistors to generate alternating current, and a rectified output is obtained via the transformer. This output is supplied to the start/stop device, inverter control device, and door control device to perform the required operations.

When the passenger cars stop between floors, the battery and the elevator drive inverter generate alternating current power to drive the passenger cars. At this time, the battery is connected to the DC circuit between the inverter and the converter via a diode. Therefore, by starting the rider in a direction opposite to the free running direction, an increase in the voltage of the DC circuit due to regenerated power is suppressed.

As described above, according to this technique, it is necessary to separately provide a power control device necessary for opening the electromagnetic brake and operating the contactor control device, inverter control device, etc. during a power outage.

Furthermore, since the driving direction of the elevator compartment by the inverter for driving the elevator is opposite to the self-propelling direction, the required torque generated by the electric motor is large, and the battery capacity is accordingly large.

[Purpose of the invention]

An object of the present invention is to provide this type of elevator control device that is inexpensive and reliable by sharing the power control device for normal operation with the power control device for emergency operation during emergency operation of an elevator driven by a converter and an inverter device. It is about providing.

[Summary of the invention]

In order to achieve this object, the present invention connects an emergency DC power source directly to the output side of the converter in a power control device composed of a converter and an inverter that controls an induction motor for driving an elevator, and During emergency operation, this emergency DC power supply is used as a power source, and the converter is operated as an inverter to generate an AC output on the AC input side of the converter that is approximately equal to the commercial power supply voltage during normal operation, thereby providing power for the elevator control equipment. It was designed to be supplied. This alternating current power supply opens and closes the first-order corner doors, controls the inverter using the emergency direct current power supply, and performs necessary emergency operations. Note that depending on the driving direction during emergency operation, regenerative power may be generated in the induction motor, but since the emergency power source is directly connected to the DC output side of the converter, it can be absorbed by this power source.

Therefore, since a stable power supply for the inverter and the elevator control device can be obtained, there is no need to particularly limit the direction during emergency operation.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an elevator control system according to the invention using a frequency conversion device 34.

The frequency converter 34 has an emergency DC f4@48 connected to the DC circuit between the inverter section 49 and the converter section 35.The frequency converter 34 is connected to the three-phase AC power source 1 as shown in FIG. A converter unit 35 includes a rectifier circuit consisting of thyristors 36 to 41 for converting the AC output of the AC output into DC and an inverter consisting of power regeneration transistors 42 to 47, and converts the DC voltage obtained from the rectifier circuit into three-phase AC. It is composed of an inverter section 49 consisting of feedback diodes 50 to 55 and transistors 56 to 61 for converting and supplying the converted signal to the induction motor 3.

In FIG. 1, an induction motor 3 and a speed detector 4. The electromagnetic brake 6, reducer 63, and sheave 64 are connected,
A counterweight 66 and a passenger heel 67 are suspended via a lobe 65 wrapped around the sheave 64. A position detector 68 for detecting the actual position of the elevator in addition to the door motor 7 is mounted on the zero passenger car 67. is installed.

69 is a control signal generating device for operating the elevator, 70 is an operation management circuit for managing the operation of the elevator, and 71 is a reference speed pattern generating circuit.

The reference speed pattern signal generated from this circuit 71 is a signal that increases over time and then becomes constant, and a converter 72 that converts the AC output of the speed detector (AC speed generator) 4 into pulses and then converts it into a position detection signal. Above position detection IP68
When the elevator reaches a preset position, the signal decreases depending on the traveling position from then on. Further, the circuit 71 is configured to output a constant value or an emergency acceleration/deceleration pattern similar to the above acceleration/deceleration pattern during emergency operation. 73.
74 is a comparator, 75 is a PW that drives the inverter section 49
M control signal generation circuit; 76 is a DC voltage detector that detects the voltage of the battery 48; 77 is a power supply voltage detector; 78 is a comparator that compares the outputs of these surface detectors 76.7'l;
79 is a converter section 35 according to the output of this comparator 78.
A regenerative power control signal generation circuit that drives the regenerative power control transistors 42 to 47 and a thyristor 3 for power control.
This is a circuit that generates a power control signal for driving 6 to 41.

Reference numeral 80 denotes a control signal generation circuit that converts the direct current of the battery 48 into alternating current using the regenerative power control transistors 42 to 47 of the converter section 35 during emergency operation, and includes at least two phases of the transistors 42 to 47 and the thyristor 3.
A gate signal for controlling the in-phase component of the transistors among the transistors 6 to 41 is generated. 81 is a voltage converter for supplying DC power to each control device, and as shown in FIG. 3, it is composed of a transformer 82 and rectifiers 83 and 84.

The primary side of the transformer 82 has its terminals a and c connected to two phases (R and T phases in the figure) of the three-phase AC power supply 1,
Two secondary windings 86 and 87 are provided on the secondary side so as to generate voltages suitable for the electromagnetic brake 6, the door motor 7, and the control signal generating circuit 69, respectively. In addition, during emergency operation, the DC voltage of the battery 48 is transferred to the transformer 82 by the transistor 4 of the converter section 35.
The alternating current voltage converted into alternating current by two phases 42, 44, 45.47 of 2 to 47 is input. In addition, a voltage converter 8 consisting of a rectifier and a resistor (not shown) is connected to the two phases of the three-phase AC power supply 1.
The output is supplied to the electromagnetic brake 6 via the contact 17, and the operation of the electromagnetic brake 6 is controlled by the contact 17. Note that controlling at least two phases of the transistors 42 to 47 of the converter section 35 as described above means that if the primary side terminals a and a of the transformer 82 are connected to the R and T phases as shown in the figure. , a transistor 42, which generates a single-phase alternating current of approximately the same frequency or higher as the alternating current power supply 1, based on these correlations.
44, 45, and 47 are generated by an alternating current control signal generation circuit 80. 90 to 93 are contacts, each of these contacts 90 to 93 and each of the above contacts 16.1
7, 88 and 89 are controlled by the operation management circuit 70 mentioned above.

With the circuit configuration described above, the transistors 42 to 47 of the converter section 35 can be operated as a single-phase inverter that generates power during emergency operation using the battery 48, and the voltage converter 81 can be operated during normal operation and during emergency operation. It can be used in common with.

The elevator control process will be explained below with reference to FIG.

During normal operation, the contacts 16.90 are closed, and the control signal generator 69 is supplied with DC power from the AC power supply 1 via the voltage converter 81. A power control signal generation circuit 79 is connected to the converter section 35 . Further, a signal for closing the contact 17 and a generation signal are outputted from the operation management circuit 70 to the reference speed pattern generation circuit 71. Therefore, the electromagnetic brake 6 is released, and the reference speed pattern signal f and the speed return signal f7 from the speed generator 4 are compared by the comparator 7.3, and the deviation amount f
is obtained, and a signal f obtained by adding this deviation amount f and the reference speed pattern signal f by an adder 74 is input to a PWM signal generation circuit 75.

The PWM signal generation circuit 75 sets a frequency F and a supply voltage V based on the signal f, outputs pulses to perform constant V/F control, and drives the transistors 56 to 61 of the inverter section 49.

By the way, the elevator-driving electric motor 3 controlled by the speed pattern in this manner enters a power generation state during braking such as deceleration, and electric power is regenerated from the electric motor 3 to the DC circuit via the inverter section 49. . For this reason,
The voltage of battery 48 increases. The operation of regenerating this voltage to the AC power supply 1 side is performed as follows. i.e. 1
, the voltage V of the battery 48 is detected via the DC voltage detector 76, and this detected voltage V and the power supply voltage detector 77
The detected value V, is compared by the comparator 78, and only when the voltage V of the battery 48 is larger among the values corresponding to the deviation amount, a signal of V, -V, = AV is generated as a power control signal. It is input to circuit 79. Power control signal generation circuit 79
Now, this signal ΔV, a signal V for enabling power regeneration in synchronization with the phase of the AC power supply 1, and a gate signal for the transistors 42 to 47 of the converter section 35 are generated, and the transistors 42 to 47 convert the DC voltage. is converted into alternating current in synchronization with the power supply phase, and regenerated to the power supply 1 side.

As described above, the elevator is accelerated and decelerated according to the reference speed pattern, and when the first power reaches the stop position and the speed becomes almost zero, the contact 17 is opened by the opening signal from the operation management circuit 70. The electromagnetic brake 6 operates to keep the elevator stopped. At the same time, contact 9
3 is closed, the door motor 7 on the passenger car 67 operates, the door opens and closes, and one passenger gets on and off. Also, at this time, the induction motor 3 is efficiently controlled, and
Since the power can be regenerated, power consumption can be reduced.

Next, we will explain what happens during a power outage. When a power outage occurs, a power outage detection signal is generated from the power outage detector 15, the well point 16 is opened, the electromagnetic brake 6 is operated, and the elevator is held stopped. Further, each contact 17.90 is opened and the contact 91 is closed.

The alternating current control signal generator 80 is connected to the converter section 35 by closing the contact 91, and the gate signal from this circuit 80 causes the transistors 42 to 47 of the converter section 35 to be connected.
and the thyristors 36 to 41 are controlled to convert the converter section 3
Single-phase AC power is generated from 5 and input to voltage converter 81 . This brings about a state in which direct current power of approximately the same voltage as during normal operation is supplied to each control device.

The above operation will be explained in detail. The power outage detector 15 is activated by the occurrence of a power outage. The output signal of this power failure detector 15 is given to the operation control circuit 7o, and the contact 17 is opened by an opening signal from the circuit 70, and the electromagnetic brake 6 is operated to keep the elevator stopped. On the other hand, at the same time as a power outage occurs, the operation management circuit 7° opens the contacts 16, stops the operation of the inverter 49, stops the supply of power to the induction motor 3, and performs AC control using the battery 48 as a power source. The converter control signal for normal operation, which generates a gate signal for operating the converter as an inverter from the signal generation circuit 80, is cut off when contact 9° is opened, and in the event of a power outage, contact 91 is closed, so the gate signal is , the converter 35 is operated as an inverter via the contact 91. The output of the AC side of this converter 35 is the circuit 8o
Although the voltage is determined by a gate signal, it is set in advance to be equal to the voltage of the commercial power supply 1. Therefore, the AC output of the converter 35 is supplied to the voltage converter 81 and the voltage converter 8. It operates in the same way as when commercial power is supplied.

Therefore, from now on, in response to a signal from the operation control circuit 7o, if the door of the passenger car 67 is outside the door zone where the door can be opened, the contact 92 is closed and the electromagnetic brake 6 is released, and the reference speed pattern generation circuit 71 A speed pattern for emergency operation is generated, and the inverter section 49 is controlled according to this pattern to drive the induction motor 3.

When the position detector 68 detects that the elevator has reached the nearest floor or reference floor, the contact 92 opens and the electromagnetic brake 6 operates to keep the elevator stopped. At the same time, the contact 93 closes and the door motor 7 operates to open the door, allowing the passenger to be rescued.

As described above, by simply adding a DC power supply and a simple circuit, it is possible to control both normal operation and emergency operation such as a power outage.

By the way, in the embodiment shown in FIG. 1, a battery is always connected to the DC circuit between the converter section 35 and the inverter section 49. For this reason, the elevator can absorb regenerative energy generated during braking, such as deceleration.
There is no need to specify the driving direction during emergency operation based on the load, etc. Therefore, by performing emergency operation to the nearest floor, passengers can be rescued in a short time.

In addition, the three-phase AC power supply 1 which is difficult to control with the converter section 35
When a voltage change occurs, power can be supplied to the inverter section 49 from the battery 48, so the elevator can be operated without any trouble.

Furthermore, since the harmonic power generated from the converter section 35 and the inverter section 49 to the DC circuit can be absorbed by the battery 48, the large-capacity smoothing electrolytic capacitor commonly used up to now is no longer necessary. This means that
It is also effective in improving reliability.

Note that since it is easy to control the alternating current generated from the converter unit 35 during emergency operation to be approximately equal to the voltage and frequency of the three-phase AC power supply 1, devices such as the transformer 81 can be left as they are during normal operation, so the circuit, etc. becomes easier.

FIG. 4 shows the alternating current control signal generation circuit 80 shown in FIG.
In this case, when 0-degree voltage controlled in a linear manner occurs, the contactor 16 is opened as described above, so the detection value (2) of the power supply voltage detector 77 becomes zero. As a result, the battery voltage V.

becomes larger, and a signal of ΔV is input to the power control signal generation circuit 79. In addition, the power control signal generation circuit 79
input the output signal of the power outage detector 15, and input the synchronization signal V
, the frequency and voltage are controlled to be approximately equal to the normal frequency and voltage of the three-phase AC power supply 1. If the voltage detector 77 is connected to the phase where the same single-phase alternating current as the number of primary turns of the voltage converter 81 is generated, the voltage v3 of the battery 48 will be detected.
This becomes a constant voltage control circuit using the reference voltage as the reference voltage. As a modification of this, a reference voltage may be provided separately, or the power control signal generation circuit 79 may not perform constant voltage control.

In the case of FIG. 4, when a power outage occurs, the circuit 70 operates based on the output signal of the power outage detector 15, stops the operation of the inverter 49, and also cuts off the power to the electromagnetic brake 6 by opening the contact 17, and lifts the elevator. - Stop. At the same time, the converter is caused to operate as an inverter based on the detection signal inputted to the power control signal generation circuit 79. At this time, the power of the gate signal to the converter 35 is
Supplied as follows: The voltage of the gate signal is.

A single-phase full-wave rectified AC voltage from the voltage converter 81 is used as a power source, but as it is, the ripple voltage included in the DC is large and a stable gate signal cannot be obtained.For this reason, a capacitor with a fairly large capacity is usually used. Smooth using. This capacitor.

It has a capacity that can maintain a substantially constant DC voltage even if the gate output is taken out near the zero crossing of the AC voltage. That is, even if the supply of power from the AC power supply to the capacitor is cut off, the gate signal can be supplied for at least one cycle. and for.

Even if a power outage occurs, a gate signal can be supplied to converter 35 for a short time. With this gate signal, converter 3
5 operates as an inverter and generates an AC voltage on its AC output side, the voltage is fed back via the voltage converter 81, so the power outage time of the control signal generator 69 is extremely short.

The generator 69 can continue to operate.

〔Effect of the invention〕

As explained above, according to the present invention, an emergency DC power source is always connected to the output side of a converter in a frequency control device that controls an induction motor for driving an elevator, and harmonic power and regenerative power during normal operation are In addition to absorbing it, in the event of a power outage, etc.

Since the converter operates as an inverter for control power supply, it is not only possible to provide an inexpensive device, but also improve reliability because the large-capacity electrolytic capacitors conventionally used to absorb harmonic power can be omitted. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an elevator control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a frequency conversion device used in the elevator control device of the present invention, and FIG. 3 is a block diagram of an elevator control device according to an embodiment of the present invention. , FIG. 4 is a block diagram of the other side of the elevator control device of the present invention.

Claims (1)

[Claims] 1. An AC power supply, a contactor that cuts off the power supply, a converter device that converts the AC supplied through the contactor into DC, and converts the DC supplied to the DC side into AC, and converts the DC output of the converter into AC. an inverter device for conversion, an induction motor for driving an elevator driven by the AC output of the inverter, an emergency power supply directly connected to the DC output side of the converter;
A device for detecting a power outage of the AC power supply, a first control device for controlling the converter device as an inverter and a converter, a second control device for controlling the converter as an inverter, and a second control device for controlling the converter device as an inverter. In an elevator control device equipped with a voltage converter that receives AC voltage as input and supplies power to a control device necessary for operating the elevator, the contactor is cut off and the contactor is cut off in response to a power outage detection signal from the power outage detector. An elevator control device characterized in that the converter is controlled by the second control device so that a voltage substantially equal to the voltage of the AC power supply during normal energization is applied to the voltage converter.