JPS5980195A - Controller for elevator - Google Patents

Abstract

PURPOSE:To reduce the cost of a controller for an elevator by operating a converter also as an emergency inverter which supplies the output of the converter to an emergency voltage converter. CONSTITUTION:When a power is interrupted, a power interruption detector 15 generates a power interruption detection signal to open contacts 16, 17, 88, 90 and to close contacts 89, 91. When the contact 91 is closed, an alternating control signal generator 80 is connected to a converter 35 to control a transistor of the converter 35 by a gate signal from the converter. Thus, the converter 35 generates a single phase AC power, which is inputted to a voltage converter 81. In this manner, the DC power of the voltage substantially equal to that at the normal operation time is supplied to the respective controllers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an elevator control device, and more particularly to an elevator control device for controlling an elevator driving induction motor using a frequency displacement device Wt.

[Prior art]

There are two types of elevator operation: normal operation, which performs normal acceleration/deceleration control, and emergency operation, which is performed in emergencies such as power outages.
Conventionally, AC elevators driven by three-phase induction motors have been equipped with separate control devices for normal operation and emergency operation, and have adopted a method of switching between them.

An example of this is shown in FIG. During normal operation, the three-phase AC power supply 1 is controlled by a control device 2 composed of Cyrisk, etc. During acceleration, the primary voltage of the induction motor 3 is controlled to control the running torque, and during deceleration, the induction motor 3 The five direct current lightning currents supplied to the three primary windings are controlled, and the direct current braking torque is controlled respectively, thereby performing acceleration/deceleration control. This acceleration/deceleration control is performed using a speed detector (
This is a speed feedback control method using an AC speed generator) 4 and a control signal generator 5.

Furthermore, in order to operate the elevator, the control signal generator 5, the electromagnetic brake 6 (generally DC operation) that stops and holds the elevator, and the door motor 7 (generally a DC motor is used) that opens and closes the car door. It is necessary to supply power to each VC. Therefore, the electromagnetic brake 6 is supplied with the three-phase AC power supply 1 or the two-phase power of this power supply through the rectifier 9.
A voltage converter 8 consisting of a voltage step-down circuit 10 with resistors etc. converts the voltage into DC and supplies it to the control signal generator 5 and door motor 7.
It is converted into direct current and supplied through a voltage converter 11 consisting of 3.14.

In addition, during emergency operation during a power outage, there is a power outage detection device! 1
5 detects a power outage, and the detection signal switches each contact (or contactor) 16 to 24 to operate the emergency operation device 25. In other words, an emergency DC power source 26 such as a battery
The inverter device 28, which is controlled by the control signal from the control signal generator 27, converts the DC power into three-phase AC power and supplies it to the induction motor 3 to drive it. Power to each of the above-mentioned devices t5, 6.7 and the control signal generator 27 is obtained by converting the DC power from the emergency DC power supply 26 to the single-phase inverter 29.
After converting into AC power, transformer 31 and rectifier 32
．． Through the voltage converter 30 consisting of 33, the DC power is maintained at a voltage approximately equal to the voltage supplied during normal operation.

However, such conventional control methods require a control device for emergency operation consisting of multiple inverters and a voltage converter such as a transformer, in addition to the control device for normal operation, which significantly increases costs. There was a drawback. Furthermore, during normal operation, both acceleration and deceleration must be controlled within a range in which the induction motor has a large slip, resulting in large losses and increased power consumption.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive elevator control device of this type that overcomes the drawbacks of the prior art described above.

[Summary of the invention]

In order to achieve this object, the present invention connects an emergency DC power source to the output side of a converter in a frequency conversion device consisting of a converter and an inverter that controls an induction motor for driving an elevator, and It is characterized in that it doubles as an emergency inverter that converts the DC output of the emergency DC power source into AC power and supplies the emergency voltage converter f.

[Embodiments of the invention]

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

FIG. 2 shows a voltage-type layered wave number conversion device 3 capable of power regeneration used to control an induction motor 3 for driving an elevator.
4 is shown. This (2) 1-wavelength layer wave number converter 34 includes a rectifier consisting of diodes 36 to 41 for converting the AC output of the three-phase AC power supply 1 to DC, and transistors 42 to 47 for power regeneration. a converter section 35 comprising an inverter, a capacitor 48 for smoothing the DC voltage obtained from the rectifier, and a feedback diode for converting this DC voltage into three-phase AC and supplying it to the induction motor 3. 50 to 55 and an inverter section 49 including transistors 56 to 61.

Then, the inverter section 49 is controlled by a general PWM control method so that the voltage V and frequency F supplied to the induction motor 3 are constant V/F.

Figure 3 shows an elevator control system according to an embodiment of the present invention using the frequency converter 34 of Figure 2. Furthermore, the third
In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same or equivalent parts.

In the frequency converter 34, a series circuit of the emergency DC power supply 26 and the diode 62 is connected in parallel with the smoothing capacitor 48.

In addition to the speed detector 4 and the electromagnetic motor 1, the induction motor 3 is connected to a speed reducer 63 and a sheave 64, and a counterweight 66 and a car 67 are suspended via a rope 65 wrapped around the sheep 64. It's lowered. In addition to the door motor 7, the elevator car 67 is provided with a position detector 68 for detecting the actual position of the elevator. 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 turn 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. Using both signals from the position detector 68, when the elevator reaches a preset position, the signal decreases in accordance with the traveling position thereafter. Further, the circuit 71 is configured to output a constant value or an emergency acceleration/deceleration pattern similar to the above-mentioned acceleration/deceleration/turn during emergency operation.

73, 74 & is a comparator, 75 & i is a PWM control signal generation circuit that drives the inverter unit 49, 76 is a DC voltage detector that detects the voltage of the smoothing capacitor 48, 77 is a power supply voltage detector, 78 (Mako J A comparator 79 compares the outputs of the two detectors 76 and 77, and 79 is a regenerative power control signal that drives the regenerative power control transistors 42 to 47 of the connolly section 35 in accordance with the output of the comparator 78. This is a generation circuit.

Reference numeral 80 denotes an AC conversion control signal generation circuit for converting the DC voltage of the emergency DC power supply 26 into AC using the regenerative power control transistors 42 to 47 of the converter section 35 during emergency operation, and includes at least one of the transistors 42 to 47. Generates gate signals to control two phases. , 81 is a voltage converter for supplying DC power to each control device, and as shown in FIG. It consists of

The primary side of the transformer 82 has its terminals a and c connected to two phases (biR 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 to generate voltages suitable for the electromagnetic brake 6, the door motor 7, and the control signal generation circuit 69, respectively. Also,
During emergency operation, by opening the contact 88 and closing the contact 89, the DC voltage of the emergency DC power supply 26 is connected between the terminal C of the transformer 82 and the intermediate tap b of the transistor 42 of the converter section 35. An alternating current voltage converted into alternating current at two phases 42, 44, 45, and 47 out of 47 is to be input. The position of the intermediate tap b is as follows:
It is determined by the ratio of the voltage of the AC power supply 1 and the voltage of the emergency DC power supply 26, and is set so that approximately the same voltage is generated on the secondary side during normal operation and during emergency operation. 1. c, as mentioned above, the transistors 42 to 4 of the converter section 35
Controlling at least two phases of the transformer 82 means that the primary side terminals of the transformer 82 are connected as shown in the figure.
If it is the T phase, the transistor 42,
44, 45, and 47 are generated by an AC control signal generation circuit 8o. 90 to 93 are contacts, each of these contacts 90 to 93 and each of the above contacts 16, 1
7°88.89 is controlled by the operation management circuit 70Vc.

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 from the emergency DC power supply 26, and the voltage converter 81 can be operated during normal operation. It can be used in common during emergency operation.

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

During normal operation, the contacts 16, 88, and 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 regenerative 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 fp and the speed generator 4
A comparator 73 compares the speed feedback signal fr from PW to obtain a deviation amount f, and an adder 74 adds this deviation amount f and the reference speed pattern signal fp to obtain a signal f.
Input to the M signal generation circuit 75. The PWM signal generating circuit 75 sets the frequency F and the supply voltage (2) based on the signal f, outputs a pulse so that constant V/F control is performed, and drives the transistors 56 to 61 of the inverter section 49.

By the way, the elevator drive electric motor 3, which is controlled by the speed pattern in this way, 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 smoothing capacitor 48 increases. The operation of regenerating this voltage to the AC power supply 1 side is performed as follows. In other words, the voltage of the smoothing capacitor 48 ■. is DC voltage detector 7
6, this detected voltage Vc and the detected value (2) of the power supply voltage detector 77 are compared by the comparator 78, and the voltage (2) of the smoothing capacitor 48 is determined from among the values corresponding to the deviation amount.

y, −v if and only if is larger. =Δ■ A narrow signal is input to the power regeneration control signal generation circuit 79. In the power regeneration control signal generation circuit 79, this signal ΔV and the AC power supply 1
Signal to enable power regeneration in synchronization with 0 phase■,
A gate signal is generated for the transistors 42 to 47 of the converter section 35, and the transistors 42 to 47 convert the DC voltage to AC in synchronization with the power supply phase, and regenerate this to the power supply 1 side.

As mentioned above, the elevator has a reference speed pattern [1
Therefore, acceleration/deceleration control is performed, and when the passenger 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 is operated, and the elevator is stopped. Retained. At the same time, the contact 93 is closed, the door motor 7 on the car 67 is operated, and the door is opened and closed, allowing passengers to board and exit the car. Further, at this time, the induction motor 3 can be controlled efficiently and its power can be regenerated, so that 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, and the contact 16 is opened to operate the electromagnetic brake 6 to keep the elevator stopped. Further, each contact 17, 88, 90 is opened, and each contact 89°91 is closed. By closing the contact 91, the converter section 35 receives the alternating current control signal generation circuit 8.
0 is connected, transistors 42 to 47 of converter section 35 are controlled by the gate signal from this circuit 80, single-phase AC power is generated from converter section 35, and is 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.

Then, if the door is outside the door zone where the passenger door 67 can be opened by a signal from the operation control circuit 70, the contact 92 is closed and the electromagnetic brake 6 is released, and a reference speed pattern is generated. A speed pattern for emergency operation is generated from the circuit 71, 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 the reference floor, the contact 92 opens, the electromagnetic brake 6 operates, and the elevator is held 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, control can be performed both during normal operation and during emergency operation such as a power outage.

Note that the transformer 82 in the voltage converter 81 shown in FIG.
, as above (-next side winding + Mss < intermediate tap b
Instead of providing a secondary winding 85, an emergency secondary winding separate from the secondary winding 85 may be provided. In this case, it is necessary to obtain almost the same voltage at the secondary windings 86 and 87 as during normal operation.

Furthermore, instead of the voltage-type frequency converter M34 capable of power regeneration shown in FIG. 2, a voltage-type frequency converter 98 shown in FIG. A current source layer wave number conversion device 101 could also be used.

That is, in the voltage type frequency converter 98 shown in Fig. @5, the converter section 35 is not provided with an element for performing power regeneration operation, and during normal operation, the contacts 94 and 95 are closed and the converter section 35 is closed. 35 performs variable voltage control, but during emergency operation, by opening contacts 94 and 95 and closing contacts 96 and 97, transistors 42 to 47 of converter 35 are controlled, and DC power supply 26 is controlled as a power supply for the control device. It can be operated as an inverter.

Similarly, in the current source layer wave number converter 101 shown in FIG. 6, the contacts 94 and 95 are closed during normal operation, and the converter section 35 performs variable voltage control, but during emergency operation, the contacts 94 and 95 are closed. .95'& open circuit and contact 96.
By closing 97, the converter section 35 can be operated as an inverter for using the DC power supply 26 as a power supply for the control device.

Here, an example is shown in which a transistor is used as a control element constituting the converter section 35 and inverter section 49 of the frequency converter, but the invention is not limited to this, and a control element such as a thyristor with a commutation function may also be used. No problem.

〔Effect of the invention〕

As explained above, according to the present invention, the converter is connected to the output side of the converter in the frequency conversion device, which is an emergency DC power supply, for controlling an induction motor for driving an elevator, and the converter is connected to the output side of the converter, which is an emergency DC power supply. Since it also serves as an emergency inverter that converts the voltage into alternating current and supplies it to an emergency voltage converter, the device can be provided at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional elevator control device equipped with an emergency operation device, Fig. 2 is an electric 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 a conventional elevator control device equipped with an emergency operation device. A block diagram of an elevator control device according to an embodiment of the invention, FIG. 4 is an electric circuit diagram showing details of a power supply portion for the control device in the elevator control device of FIG. 3,
5 and 6 are electrical circuit diagrams showing the other side of the frequency converter used in the elevator control system of the present invention. 1...Three-phase AC power supply, 3...Elevator drive induction motor, 15...Power failure detection device, 26...Emergency DC power supply, 34・・・・・・
Voltage type frequency converter capable of power regeneration, 35...
・Converter section (also used as emergency second inverter), 4
9... Inverter section (also used as emergency first inverter), 69... Control signal generator, 81...
...Voltage converter (combined for first and second voltage converters), 82...Transformer, 83, 84...
・Rectifier, 85...-Next winding, a, c・
...terminal, b...middle tap, 86,8
7...Secondary winding, 98...Voltage type frequency converter that cannot regenerate power, 101...Current type layer wave number converter that can regenerate power. Figure 1 3 60

Claims (1)

[Claims] 1. Frequency conversion that includes an AC power source, a converter that converts the AC output of the AC power source into DC, and an inverter that converts the DC output of this converter into AC and supplies it to an induction motor for driving an elevator. a first control signal generator that generates control signals for controlling the converter and inverter of the frequency conversion device; a first voltage converter that supplies the control signal generator; an emergency DC power supply; and an emergency first inverter that converts the DC output of the emergency DC power supply into AC and supplies it to the rust-conducting motor. , a second control signal generating device that generates a control signal for controlling the first inverter, an emergency second inverter that converts the DC output of the emergency DC power supply into AC, and this second inverter. W, which converts the AC output of the inverter into DC of a predetermined voltage and supplies it to the second control signal generator; An elevator control device, characterized in that it is connected to the output side of a converter of a frequency converter, and the converter of the frequency converter also serves as the emergency second inverter. 2. An elevator control device according to claim 1, characterized in that the inverter of the frequency conversion device also serves as the emergency first inverter. 3. Adding claim 1 or claim 2 to 'i'
An elevator control device characterized in that the first voltage converter also serves as the second voltage converter. 4. In claim 3, the second voltage converter that is also used as the first voltage converter includes a transformer in which an intermediate tamp is applied to the negative side winding, and a transformer of this transformer. It is equipped with a rectifier that rectifies the output of the secondary winding, and during normal operation, the AC output of the AC power supply is applied between both terminals of the transformer and the secondary winding, and during emergency operation, the AC output of the AC power source is applied between both terminals of the transformer and the secondary winding. The AC output of the emergency second inverter, which is also used by the converter of the frequency converter, is added between the terminal of the transformer and the intermediate tap, and the secondary winding of the transformer is 1. An elevator control device, characterized in that it is arranged to generate substantially the same voltages on the lines. 5. In claim 3, the second voltage converter that is also used as the first voltage converter includes a transformer having two primary windings with different numbers of turns, and a secondary winding of this transformer. It is equipped with a rectifier that rectifies the output of the side winding, and during normal operation, the AC output of the AC power supply is applied to the primary winding of the transformer with a large number of turns, and during emergency operation, the AC output of the AC power source is applied to the primary winding with a small number of turns. The AC output of the emergency second inverter, which is also used as the converter of the converter, is added to the converter, and the secondary winding MVC of the transformer is configured to generate almost the same voltage during normal operation and emergency operation. An elevator control device characterized in that: 6. In any one of claims 1 to 5, the frequency converter is of a lightning type, and the converter includes a semiconductor switching element with a control pole capable of regenerating power. Elevator control equipment. 7. In any one of claims 1 to 5, the frequency conversion device is of a voltage type, does not include a control element capable of regenerating the power of its converter h1, and has a converter h1 that is capable of regenerating power during normal operation and during emergency operation. An elevator characterized in that the converter and the emergency DC power supply are provided with switching elements that switch in opposite directions when connected.
Control device. 8. In any one of claims 1 to 5, the frequency converter is a current type, and the frequency converter is connected to the emergency DC power supply during normal operation and during emergency operation. 1. An elevator control device comprising switching elements that switch states in opposite directions.