JPH092753A - Elevator control device - Google Patents

Abstract

PURPOSE: To perform automatic landing operation in case of power failure of a commercial power supply while protecting a power supply for emergency by detecting a current-equivalent value and a voltage-equivalent value of an induction motor, and controlling an operation speed of an elevator based on the current-equivalent value and the voltage-equivalent value of the induction motor in automatic landing operation. CONSTITUTION: When a commercial AC power supply 10 fails, a contactor coil 11 is deenergized to put a contactor contact 11b on, and a drive command is generated to an auxiliary inverter device 23. In the auxiliary inverter device 23, power of a power supply (battery) 20 for emergency is converted into three- phase AC, and after a DC power is supplied to an inverter 17 at a specified time after that, so the three-phase AC power is supplied to a control circuit 30. The control circuit 30 takes deviation between a speed command and a detected speed V to perform integrating operation for calculating a current command and a frequency command, it takes deviation between a current command value and a detected current I to perform integrating operation to calculate a voltage command, and it outputs a pulse signal, based on the voltage command value and the frequency command value to control the inverter 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device having an automatic landing operation function during a power failure.

[0002]

2. Description of the Related Art A conventional elevator control device having an automatic landing operation function during a power failure is disclosed in, for example, Japanese Patent Laid-Open No. 2-147.
As disclosed in Japanese Patent No. 581, at least one end of a battery as an emergency power source is connected to the AC side of a converter to prevent charging of the battery due to regenerative operation of an induction motor. On the other hand, for example,
As disclosed in Japanese Examined Patent Publication No. 5-77591, a circuit configuration for charging a battery with regenerative power is provided, and a dedicated detector for detecting an input current to the battery is provided, and when the charging current exceeds a predetermined value, an induction motor It is known to reduce the rotation speed of.

[0003]

In the first prior art, which has been considered to be a problem, all the regenerative electric power of the induction motor is discarded, resulting in poor energy efficiency. On the other hand, in the second conventional technique, the regenerated electric power is returned to the battery, so that the energy efficiency is good, but there is a problem that the circuit configuration becomes complicated because a dedicated current detector and its associated circuit are required.

The present invention has been made to solve the above problems, and an object thereof is to improve energy efficiency during automatic landing operation during a power failure and protect an emergency power supply with a simple circuit. And

[0005]

According to one aspect of the present invention, a converter for converting a commercial AC power supply into a DC power supply, an inverter for converting the converter output into an AC power supply to an induction motor for driving an elevator, and the above inverter. In the control device of the elevator, the current of the induction motor is controlled by the control means for controlling the Means for detecting an equivalent value, means for detecting an equivalent voltage value of the induction motor, and means for controlling the operating speed of the elevator based on the equivalent current value and the equivalent voltage value of the induction motor during the automatic landing operation. Prepare

In a preferred embodiment of the present invention,
A converter for converting a commercial AC power supply into a DC, an inverter for converting the converter output into an AC to supply power to an induction motor for elevator driving, a means for detecting the rotation speed of the induction motor, and a current flowing through the induction motor. A means for detecting, a control means for inputting the speed detection value and the current detection value to control the inverter, and for supplying power to the inverter and the control means during the commercial AC power failure to perform automatic landing operation during a power failure In an elevator control device equipped with an emergency power source, an electric power calculation means for inputting the speed detection value and the current detection value during the automatic landing operation and an output of the power calculation means are within a predetermined value. Is provided with means for limiting the speed command of the elevator.

[0007]

With this structure, the current equivalent value and voltage equivalent value of the induction motor can be obtained from the output of the existing detecting means used for controlling the inverter during the automatic landing operation, and the emergency power supply can be obtained. Achieves rapid automatic landing operation with a simple configuration while protecting the emergency power supply by keeping the amount of power exchange between the induction motor and the induction motor at a predetermined value.

[0008]

1 shows a circuit configuration of an elevator control apparatus according to an embodiment of the present invention, and FIG. 2 shows a functional configuration of a control circuit 30 in FIG.

In FIG. 1, when the commercial AC power supply 10 is normal, the contactor coil 11 is excited and the contactor contact 11a is turned on, and the power of the commercial AC power supply 10 is converted to DC by the converter 13 and charged in the capacitor 14. To be done. When an operation command is issued to the elevator, the control circuit 30 outputs a control signal (PWM pulse signal) to the inverter 17 to convert the direct current into a three-phase alternating current having a variable voltage and a variable frequency and release the brake 16. The release function is omitted), and the induction motor 18 and the hoist 42 are driven to vertically move the car 40 and the counterweight 41.

Here, when the induction motor 18 is in the regenerative operation, the regenerative power is returned to the DC side by the inverter 17 and charged in the capacitor 14. When the voltage across the capacitor 14 exceeds a predetermined value, the transistor 151 in the regenerative power consumption circuit 15 is turned on to cause the resistor 152 to consume the regenerated power. In this way, overvoltage is prevented from occurring and the device is protected, and the capacitor 14 is prevented from being overcharged.

When the commercial AC power supply 10 loses power, the contactor coil 11 is deenergized, the contactor contact 11b is turned on, and a drive command is issued to the auxiliary inverter device 23. The auxiliary inverter device 23 includes a control circuit 231 and an auxiliary inverter 232.
The electric power of the emergency power source, for example, the battery 20, is converted into a three-phase alternating current, and the contactor coil 21 is excited to turn on the contacts 21a and 21a ₁ after a certain period of time. Therefore, the DC power of the emergency power supply 20 is supplied to the inverter 17, and the three-phase AC power is supplied to the control circuit 30. As a result, the control circuit 30 uses the inverter 17 in the same manner as in the normal state to change the DC power from the emergency power source 20 to a variable voltage.
Converts to variable-frequency three-phase alternating current and brake 16
Then, the induction motor 18 and the hoisting machine 42 are driven to drive the car 40 and the counterweight 41 up and down.

The operating direction is the direction of action of the unbalanced torque generated by the weight difference between the car 40 and the counterweight 41 with reference to the signal from the weighing device 33 provided on the car 40. In this way, the induction motor 18 is rotated to the side with the smaller negative load, and the capacity of the emergency power supply 20 is reduced.

When the car 40 approaches the nearest floor, the speed command of the elevator is reduced to decelerate and the brake 16
To stop it.

In FIG. 2, the speed command generator 35 calculates the speed command V * based on the driving command from the driving controller 39, and inputs it to the speed controller 36 together with the detected value V of the speed detector 32. The speed control unit 36 calculates the current command I * and the frequency command f * by performing the integral calculation by taking the deviation between the speed command value V * and the speed detection value V. The current control unit 37 calculates the voltage command E * by performing the integral calculation by taking the deviation between the current command value I * and the detection value I of the current detector 31, and sends it to the pulse control unit 38 together with the frequency command value f *. input. The pulse control unit 38 outputs a pulse signal PS based on the voltage command value E * and the frequency command value f *, and the inverter 1
7 is driven.

The electric power calculator 34 calculates the electric power supplied to the induction motor 18 by the following arithmetic expression. Induction motor power P = k × (motor current equivalent value) × (motor voltage equivalent value) (1) where k = conversion constant.

As the current equivalent value of the induction motor, the output value I of the current detector 31 of the induction motor 18, the current command value I * to the inverter 17, the torque command value to the induction motor 18, or the torque detection of the induction motor. Values and the like can be used and are used for ordinary control, and it is not necessary to add a detection device or the like. As the voltage equivalent value of the induction motor 18, the voltage detection value of the induction motor 18, the output voltage command value E * to the inverter 17, the speed detection value V of the induction motor 18, and the speed command value V * of the induction motor 18 are used.
, The frequency command value f * of the inverter 17 or the output frequency f of the inverter 17 can be used, and these are also used for normal control, and it is not necessary to newly add a detection device or the like.

When the calculated value P of the supplied electric power exceeds a predetermined value on the power running side, the speed command preparing section 35 suppresses the increase of the speed command value V * and suppresses the electric power supplied to the induction motor 18 for emergency use. Do not exceed the discharge capacity of the power supply 20.

FIG. 3 is a diagram for explaining the operation of the above embodiment of the present invention. FIG. 3 (a) is a conventional automatic rescue operation speed curve at the time of a power failure in an elevator, and FIG. 3 (b) is the same as the present invention. It is a figure which shows the automatic rescue operation speed curve at the time of a power failure when applied to an elevator. Conventionally, even in the worst situation where there are full passengers in the elevator car 40 and the rescue operation must be performed in the ascending direction, the maximum speed is set to allow the rescue operation with a given battery with a margin. As shown in 3 (a), it is assumed that the speed could only be increased to 8 m / min.

On the other hand, if the present invention is applied, the maximum speed can be increased to 15 m / min. That is, as shown in FIG. 3B, a first speed command V1 * having a maximum speed of 15 m / min is prepared, and when the induction motor power P reaches a predetermined value (P _max-α ), a speed command is issued. The creation unit 35 suppresses the rise of the speed command V *. Therefore,
In the rescue operation in a relatively light load state where the induction motor power P does not reach the predetermined value (P _max-α ), the actual speed command also becomes the _first speed command V ₁ * Realize prompt rescue at a maximum speed of 15 m / min. next,
In the case of rescue operation under a relatively heavy load, the induction motor power P reaches a predetermined value (P _max-α ) at the time t ₂ as shown in the figure, and hence the speed command generation unit 35 thereafter. Suppress the rise of speed command V *. Therefore, the actual speed command can suppress the maximum speed as indicated by the solid line V * in the figure. In the illustrated example, the maximum speed is 10 m / min. As described above, the control circuit 30 uses the output of the weighing device 33 to select the direction in which the burden is light and perform the rescue operation.
Therefore, it is extremely unlikely that the rescue operation will occur in the worst state conventionally assumed. Only when such an extremely rare situation occurs, the power P at the time t ₁ shown in FIG.
_{Reaches a} predetermined value (P _max-α ), and only in this case the maximum speed is suppressed to 8 m / min.

As described above, since the rescue operation is performed by selecting the direction in which the burden is light, the inverter 1 during the rescue operation is selected.
7 and the induction motor 18 can be said to have half the opportunities for power running and regeneration. There is no difference from the power running operation during the regenerative operation, and when the calculated value P of the supplied electric power exceeds the predetermined value on the regenerative side, the speed command creation unit 35 lowers the speed command value V * and regenerates from the induction motor 18. The power is suppressed so that the input current of the emergency power supply 20 does not become excessive. On the other hand, when the calculated value of the supplied power is lower than the predetermined value, the speed command creating unit 35 increases the speed command value V * as planned to increase the power supplied (regenerative) to the induction motor 18, and the emergency power supply 20 To enable efficient use of charge / discharge capacity.

As a result, the rescue operation time of the conventional device always required a long time of 0 to t ₅ shown in FIG. 0) of b)
It will be a short time again, depending on the situation at that time, such as t ₃ , 0 to t ₄ .

According to this embodiment, the energy efficiency in the automatic landing operation during a power failure and the protection of the emergency power supply can be realized by a simple circuit, and at a high speed as much as possible at all times. The rescue operation will be performed, and the passengers can be promptly evacuated.

In the above embodiments, the maximum speed is suppressed in accordance with the electric power transferred between the emergency power source and the induction motor, but it is also possible to suppress the acceleration / deceleration together or independently. The effect is obtained.

[0024]

According to the present invention, it is possible to improve the energy efficiency during automatic landing operation during a power failure and protect the emergency power supply with a simple device.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an elevator control device according to an embodiment of the present invention.

FIG. 2 shows a functional configuration of a control circuit 30 in FIG.

FIG. 3 is an operation explanatory diagram of an embodiment of the present invention, in which FIG. 3 (a) is a conventional automatic rescue operation speed curve at the time of a power failure in an elevator, and FIG. 3 (b) is the same elevator applied to the present invention. It is a figure which shows the automatic rescue operation speed curve at the time of a power failure in the case of doing.

[Explanation of symbols]

10 ... Commercial AC power supply, 13 ... Converter, 17 ... Inverter, 18 ... Induction motor, 20 ... Emergency power supply, 23 ... Auxiliary inverter, 30 ... Control means (control circuit), 31 ... Induction motor current equivalent value detection means ( Current detector), 32 ...
Induction motor voltage equivalent value detecting means (speed detector), 34
... power calculation unit, 35 ... speed command creation unit, 36 ... speed control unit, 40 ... car, 41 ... counterweight.

Claims (10)

[Claims] 1. A converter for converting a commercial AC power supply into a DC power supply, an inverter for converting the converter output into an AC power supply to feed an induction motor for driving an elevator, a control means for controlling the inverter, and a commercial AC power supply power failure. In an elevator control device equipped with an emergency power supply for supplying power to the inverter and the control means at times to perform automatic landing operation during a power failure, means for detecting a current equivalent value of the induction motor, and the induction motor An elevator control device comprising: means for detecting a voltage equivalent value; and means for controlling an operating speed of the elevator based on a current equivalent value and a voltage equivalent value of the induction motor during the automatic landing operation. 2. The elevator control apparatus according to claim 1, wherein the means for controlling the operating speed is means for limiting the operating speed of the elevator based on a current equivalent value and a voltage equivalent value of the induction motor. 3. The means for controlling the operating speed is means for limiting the operating speed of the elevator so that the product of the current equivalent value and the voltage equivalent value of the induction motor does not exceed a predetermined value. The elevator control device described in 2. 4. A converter for converting a commercial AC power supply into a DC power supply, an inverter for converting the converter output into an AC power supply to an induction motor for driving an elevator, control means for controlling the inverter, and the commercial AC power supply power failure. In an elevator control device equipped with an emergency power supply for supplying power to the inverter and the control means at times to perform automatic landing operation during a power failure, means for detecting a current equivalent value of the induction motor, and the induction motor An elevator control apparatus comprising: a unit for detecting a voltage equivalent value; and a unit for controlling an elevator acceleration based on a current equivalent value and a voltage equivalent value of the induction motor during the automatic landing operation. 5. The elevator control apparatus according to claim 4, wherein the means for controlling the acceleration is means for limiting the acceleration of the elevator based on a current equivalent value and a voltage equivalent value of the induction motor. 6. The means for controlling the acceleration is a means for limiting the acceleration of the elevator so that the product of the current equivalent value and the voltage equivalent value of the induction motor does not exceed a predetermined value. Elevator control device. 7. The current equivalent value of the induction motor is a current detection value of the induction motor, a current command value to the inverter,
The elevator control device according to claim 1, which is a torque command value for the induction motor or a torque detection value of the induction motor. 8. The voltage equivalent value of the induction motor includes a voltage detection value of the induction motor, an output voltage command value to the inverter, a speed detection value of the induction motor, a speed command value for the induction motor, and an inverter voltage value. The frequency command value or the output frequency detection value of the inverter.
Or the elevator control device according to 7. 9. A converter for converting a commercial AC power source into a direct current, an inverter for converting the converter output into an alternating current to supply power to an induction motor for driving an elevator, a means for detecting a rotation speed of the induction motor, and the induction. A means for detecting a current flowing through the electric motor, a control means for inputting the speed detection value and the current detection value to control the inverter, a power supply to the inverter and the control means at the time of the commercial AC power failure, and automatic arrival at the time of the power failure. In an elevator control device equipped with an emergency power supply for floor operation, a calculating means for inputting the speed detection value and the current detection value during the automatic landing operation, and the output of the calculating means is within a predetermined value. An elevator control device comprising means for limiting an elevator speed command so that 10. The elevator control according to claim 9, wherein the arithmetic means includes means for arithmetically operating the electric power transferred between the emergency power source and the induction motor based on the speed detection value and the current detection value. apparatus.