JP2001240335A - Elevator blackout operation device - Google Patents

Abstract

(57) [Summary] To provide an elevator power failure operation device in which a car 12 stopped between floors due to a power failure smoothly moves up and down to allow a passenger 12a to escape from inside the car 12. SOLUTION: A direct current smoothed by a smoothing capacitor 3 is converted into a variable voltage direct current by a DC chopper circuit 4 to drive a direct current motor 5 so that a balancing weight 13 and a basket 12 suspended in a slidable manner. In an elevator that is lifted and lowered, one of the car 12 and the counterweight 13 is moved down to the floor by moving the heavier one, and the field current of the DC motor 5 is controlled by controlling the field current of the DC motor 5. By maintaining the terminal voltage of the smoothing capacitor 3 of the DC circuit at a predetermined value, the regenerative electric power generated by the operation is consumed in the DC motor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator power failure operation device which lowers a car or a counterweight during landing in the event of a power failure.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional elevator operation device during a power failure. In normal times, the elevator control device 60 receives the supply of power from the three-phase AC power supply 1 and controls the DC motor 5 to drive the hoisting machine 10 and raise and lower the car 12. The elevating speed of the car 12 is determined by the encoder 27 and the speed detecting circuit 2.
8, and is controlled to follow a predetermined speed pattern. If a power failure occurs during the operation of the elevator, the electromagnetic brake 10a is closed and the car 12 is brought to an emergency stop. At this time, when the car 12 stops between floors, the power failure control device 61 operates to release the electromagnetic brake 10a,
The car 12 is raised or lowered due to the weight imbalance between the car 12 and the counterweight 13 at that time. When the car 12 approaches the nearest landing level, the electromagnetic brake 10a
, The car 12 is stopped, the door is opened, and the passenger 12
a was to be dropped from the basket 12.

[0003]

Since the conventional elevator power failure operation device is constructed as described above, it is necessary to raise and lower the car 12 and rescue the passengers 12a in the car 12 during the power failure. The condition was that the weight difference from the counterweight 13 was large. Under these conditions, basket 12
Is moved up and down, the speed of the car 12 fluctuates due to the weight difference. Further, since the electromagnetic brake 10a is directly operated to stop the braking of the car 12, when the car 12 stops, not only the shock is large and the riding comfort is poor, but also the car 12
There is a problem that the landing error between the floor surface and the floor is large. Further, when the unbalanced weight of the car 12 and the counterweight 13 is small, the car 12 stops in a state of being balanced with the counterweight 13, and there is also a problem that the passenger 12 a cannot escape from the inside of the car 12. . Furthermore, Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 77410 discloses that a dedicated DC motor is provided for operation at the time of a power failure. However, there is a problem that the apparatus is too expensive for a rare abnormal situation such as a power failure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has been made in the event of a power outage of an elevator in which a car stopped between floors due to a power outage is smoothly raised and lowered to allow a passenger to escape from the inside of the car. The aim is to obtain a device.

[0005]

A first elevator power failure operation device according to the present invention drives a DC motor by converting a direct current smoothed by a smoothing capacitor into a variable voltage direct current by a DC chopper circuit. Then, in an elevator in which a car suspended in a hanging manner with a counterweight is raised and lowered, when a power outage occurs, one of the car and the counterweight is lowered to drive to the floor. Wherein the regenerative power generated by operation is consumed in the DC motor by controlling the field current of the DC motor to maintain the terminal voltage of the smoothing capacitor of the DC circuit at a predetermined value. It is.

A second elevator power outage operating device according to the present invention is a device for lowering a heavier one to operate up to the floor, wherein a speed pattern for controlling the speed of a DC motor is controlled. By controlling the terminal voltage of the smoothing capacitor of the DC circuit to a predetermined value by controlling, the regenerative power generated by the operation is consumed in the DC motor.

According to a third elevator operating system for power failure of an elevator according to the present invention, in the operating system for power failure of the first or second elevator, a DC power supply is connected by connecting a DC power supply when a power failure is detected by a power failure detecting circuit. The motor is started.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 First, the principle of the present invention will be described with reference to FIG. The DC motor 5 has a rotating shaft 9
, And is directly connected to a hoisting machine 10, and an unbalanced weight 13 a is hung on the rotating shaft 9. Here, J: moment of inertia on the rotating shaft 9, ω: angular velocity of the rotating shaft 9,
τ: shaft torque, Tc: load torque due to unbalanced weight 13a and running resistance, V: terminal voltage, E: induced voltage, If:
Field current, Φ: effective magnetic flux, Ia: armature current, and Ra: armature resistance.

The shaft torque τ is given by τ = J · (dω / dt) + Tc (1) The following equations hold for the DC motor 5 as the constants Kt and Ke. τ = Kt ・ Φ ・ Ia (2) E = Ke ・ Φ ・ ω (3) Assuming that the DC motor 5 is generating regenerative power P as a generator, E = V + IaａRa (4) ∴ P = Ia · E = Ia (V + Ia · Ra) (5)

In the formula (5), (Ia.Ia.Ra)
Is the regenerative power consumed by the armature of the DC motor 5. Therefore, if the control is performed so that E = Ia · Ra (6), all the regenerative electric power P is consumed by the DC motor 5. In the equation (6), the above (2)
By rearranging the equations and the equation (3), Ra · τ = Ke · Kt · (Φ · Φ) · ω (7) Here, since the effective magnetic flux Φ is a function of the field current If, the field current If is made to correspond to the angular velocity ω of the rotating shaft 9.
Is controlled, the entire regenerative electric power P can be consumed by the electric motor 5.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 3 based on the above analysis. In the first embodiment, the armature current Ia is increased or decreased by increasing or decreasing the field current If according to the magnitude of the regenerative power, and the regenerative power is consumed by the armature resistance Ra. In FIG. 1, 1 is a three-phase AC power supply, 2 is an IGBT
(Insulated Gate Bipolar T
A converter comprising a combination of a rectifier and a diode enables both forward conversion from three-phase AC to DC and reverse conversion for returning regenerative power generated during normal operation to the three-phase AC power supply 1 side. 3, a smoothing capacitor for smoothing the DC output converted by the converter 2;
A circuit element in which a GBT and a diode are connected in anti-parallel is further connected in a bridge form, and ON-OFF by PWM control
And a DC chopper circuit for performing DC voltage control in both forward and reverse directions.

Reference numeral 5 denotes a DC motor controlled by the DC chopper circuit 4, and reference numeral 6 denotes a converter for converting three-phase AC to DC, which is constituted by a diode. 7 is a converter 6
Is a DC chopper circuit that turns on and off the direct current by PWM control to perform voltage control. Reference numeral 8 denotes a field winding of the DC motor 5, which is controlled by the DC chopper circuit 7. Reference numeral 9 denotes a rotating shaft directly connected to the DC motor 5, reference numeral 10 denotes a hoisting machine connected to the rotating shaft 9, reference numeral 11 denotes a main rope wound around the hoisting machine 10, and reference numeral 12 denotes one end of the main rope 11. The suspended basket, 12a is the passenger in the basket 12, and 13 is the main rope 1.
1 is a counterweight suspended at the other end of 1.

Reference numeral 14 denotes a main circuit storage battery that supplies power to the DC motor 5 via the converter 2 and the DC chopper circuit 4 at the time of a power failure, and generates a voltage Vb. A main circuit switch 15 is normally connected to the terminal a to supply the three-phase AC power supply 1 to the converter 2 and is connected to the terminal b to supply DC from the main circuit storage battery 14 to the converter 2 during a power failure. , 1
Reference numeral 6 denotes a field circuit storage battery for supplying electric power to the field winding 8 of the DC motor 5 at the time of a power failure. Reference numeral 17 is normally connected to the terminal a to supply the three-phase AC power supply 1 to the converter 6 at the time of a power failure. The field circuit storage battery 16 is connected to the terminal b and connected to the converter 6.
This is a field circuit switch that supplies a direct current from the field circuit.

Reference numeral 21 denotes a detection terminal connected to both ends of the smoothing capacitor 3, and 22 denotes a detection terminal connected to the smoothing capacitor 3.
, A reference numeral 23 denotes a DC current transformer mounted on the armature circuit of the DC motor 5, 24 denotes an armature current detection circuit for detecting the armature current Ia from the DC current transformer 23, 25 Is a DC current transformer mounted on the circuit of the field winding 8, 26 is a field current detection circuit for detecting the field current If from the DC current transformer 25, 27 is an encoder mounted on the rotating shaft 9, 28 Is a speed detection circuit for detecting the angular velocity ω of the rotary shaft 9 from the encoder 27, and 29 is a car load detection circuit for detecting a car load.

Reference numeral 30 denotes a power failure control unit that controls the elevator during a power failure. Of these, 31 is a power failure detection circuit that detects that the three-phase AC power supply 1 has lost power, and 32 is a main circuit switch 15 that switches the main circuit switch 15 from the three-phase AC power supply 1 to the main circuit storage battery 14 when the power failure detection circuit 31 detects a power failure. A power switching circuit for switching the field circuit switch 17 from the three-phase AC power supply 1 to the field circuit storage battery 16; a stop position detection circuit 33 for detecting the position of the car 12 stopped due to the power failure;
Numeral 34 denotes a driving direction determining circuit for lowering the heavier one of the car 12 and the counterweight 13 to drive to the nearest floor based on the detection signal of the car internal load detecting circuit 29. Each of the above is a well-known matter, and the details are omitted.

Reference numeral 41 denotes a field current command generation circuit, which comprises a capacitor voltage command generation circuit 41a and a field current command control circuit 41b as shown in detail in FIG. The capacitor voltage command value Vcp shown in b) is output, and the command value Vcp and the capacitor voltage detection circuit 2 are output from the field current command control circuit 41b.
2 is compared with the capacitor voltage Vc, and calculated based on the equation (7) to output the field current command value Ifc as shown in FIG. 3C. That is, when Vc> Vcp, control is performed so as to weaken the field current If and reduce the effective magnetic flux Φ so that the equation (7) is satisfied with respect to the angular velocity ω at that time. 42 compares the command value Ifc of the field current command generation circuit 41 with the actually detected field current If,
A field current control circuit 43 calculates a field voltage command so that the field current If becomes a command value Ifc. A field current control circuit 43 generates a PWM signal based on the field voltage command of the field current control circuit 42.
A WM circuit 44 is a gate drive circuit that controls the gate of the DC chopper circuit 7 on / off by a signal of the PWM circuit 43 to control a field voltage.

Reference numeral 45 denotes a speed pattern Sp shown in FIG.
The speed pattern generation circuit 46 generates the speed pattern Sp and the actual speed Sf detected by the speed detection circuit 28.
A speed control circuit which outputs a value calculated by the equation (1) from a difference value between the torque control value and the in-car load as a torque command value, and a speed control circuit 47 calculates (2) the torque command value from the speed control circuit 46 and the field current If. )), An armature current control circuit for calculating an induced voltage E required for the armature current Ia according to the equation (6) and outputting it as a voltage command. A PWM circuit that generates a PWM signal based on a voltage command from the control circuit 47, and a gate 49 of the DC chopper circuit 4 is turned on by a signal of the PWM circuit 48
This is a gate drive circuit that performs / OFF control.

Next, the operation will be described. 1. Normal operation The main circuit switching device 15 and the field circuit switching device 17 are both connected to the three-phase AC power supply 1 and control the DC of the converter 2 by the DC chopper circuit 4 to control the DC motor 5.
To drive the car 12 up and down. When the heavy load of the car 12 increases, the DC motor 5 functions as a motor,
When the heavy load drops, it functions as a generator and returns the regenerative power to the three-phase AC power supply 1 via the DC chopper circuit 4 and the converter 2 to perform the up / down operation.

2. Operation at the time of a power failure When a power failure occurs, the power failure detection circuit 31 operates, and the main circuit switch 15 and the field circuit switch 17 are supplied to the main circuit storage battery 14 and the field circuit storage battery 16, respectively. With this input, the capacitor 3 and the DC chopper circuit 4 are connected as shown in FIG.
As shown in (b), the voltage Vb of the main circuit storage battery 14 is applied, and the field winding 8 is excited with the field current reference value Ifs as shown in FIG. Assuming that the car 12 is stopped between floors and has a light load, the car 12 is operated to rise by the driving direction determination circuit 34. This ascending operation will be described with reference to FIG.

(1) Times t0 to t1 It is assumed that the car 12 starts the ascending operation at the time t0. The speed of the DC motor 5 is controlled according to the speed pattern Sp in FIG. During this time, the DC motor 5 functions as a motor to accelerate the car 12. Therefore, since no regenerative electric power has yet been generated, the capacitor voltage Vc is charged by the main circuit storage battery 14 to become the voltage Vb as shown in FIG. 3B, and the field current is as shown in FIG. As shown in FIG. At time t1, the DC motor 5 functions as a generator to generate regenerative power.

(2) Times t1 to t2 The regenerated power is returned by the DC chopper circuit 4 to charge the smoothing capacitor 3. The actual speed Sf rises following the speed pattern Sp, and accordingly, the capacitor voltage V
As shown in FIG. 5B, c also rises and coincides with the commanded capacitor voltage value Vcp at time t2. Thereafter, the field current If is controlled so that the regenerative power is consumed by the DC motor 5.

(3) Time t2 to t3 to t4 The capacitor current command value V is set by the field current command control circuit 41b.
When cp is compared with the capacitor voltage Vc and the capacitor voltage Vc exceeds the command value Vcp, the field current command control circuit 41b calculates based on the equation (7) and sets the field current command value Ifc to the field current reference. It is decreased from the value Ifs. The field current If decreases according to the command value Ifc, and accordingly, the armature current Ia increases according to the equation (2). As the armature current Ia increases, the consumption of regenerative power in the armature resistance Ra increases. When the regenerative electric power is completely absorbed by the DC motor 5 at time t3, the capacitor voltage Vc becomes equal to the command value V
cp. Thereafter, this state continues until time t4.

(4) Time t4 to t5 When deceleration is started at time t4 in accordance with the speed pattern Sp, the deceleration torque is energized and the regenerative electric power is increased more than before. For this reason, the field current command value Ifc further decreases,
As a result, the armature current Ia increases, and the regenerative power is absorbed by the DC motor 5 in its entirety. Although the regenerative power also decreases as the speed decreases, the capacitor voltage Vc is prevented from being discharged by the converter 2 and the DC chopper circuit 4 and holds the command value Vcp. When the vehicle arrives at the nearest floor at time t5 and stops, the smoothing capacitor 3 discharges to the voltage Vb, and the field current If becomes the reference value Ifs.

According to the first embodiment, at the time of a power failure, the main circuit storage battery 14 is connected to the three-phase AC power supply 1 side of the converter 2 to supply power to the DC motor 5 to start up.
Even if regenerative braking is performed, the terminal voltage Vc of the smoothing capacitor 3
Is controlled to be maintained at a predetermined command value Vcp. For this reason, basket 1 and counterweight 1
3 is unbalanced, and when the heavier one is lowered to land on the nearest floor, the terminal voltage Vc of the smoothing capacitor 3 is maintained at the predetermined command value Vcp. The regenerative electric power generated in this way is consumed entirely in the DC motor 5. Therefore, even if a power failure occurs and the regenerative power can no longer be absorbed on the three-phase AC power supply 1 side, the speed pattern Sp is applied while applying regenerative braking without causing the car 12 to overspeed.
Accordingly, the car 12 can be driven to the nearest floor to land on the floor, and riding comfort and landing system can be secured. Further, when a power failure occurs, even if the car 12 and the counterweight 13 are balanced, the DC motor 5 can be driven by the main circuit storage battery 14 to land the car 12 on the nearest floor. Further, the main circuit storage battery 14 is connected to the three-phase AC power source 1 of the converter 2.
Side to prevent charging of the main circuit storage battery 14 by the regenerative power, so that it is easily detected whether the regenerative power flows out of the DC motor to the outside by detecting the terminal voltage Vc of the smoothing capacitor 3. it can.

Embodiment 2 In the second embodiment, the regenerative power is limited by suppressing the speed so that the regenerative power can be absorbed in the DC motor 5. 4 to 6 show:
Embodiment 2 of the present invention will be described. In the drawing, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts, and the description will be omitted. 5
Reference numeral 0 denotes a power failure control unit that controls the elevator during a power failure. Reference numeral 51 denotes a field current command generation circuit that outputs the field current command value Ifc shown in FIG. Reference numeral 52 denotes a speed pattern generation circuit. As shown in detail in FIG. 5, a capacitor voltage command generation circuit 41a generates a capacitor voltage command value Vcp shown in FIG. 6B, and the speed pattern control circuit 52b generates a command value Vcp. The capacitor voltage Vc from the capacitor voltage detection circuit 22 is compared. From this comparison result, V
If c> Vcp, the speed pattern control circuit 52b
In order to limit the regenerative power, calculation is performed based on equation (3), and the speed pattern Sp is changed and output as shown by the solid line in FIG. 6A.

Next, the operation will be described. The normal operation is the same as in the first embodiment, and the description is omitted. Hereinafter, the operation during a power failure will be described with reference to FIG. (1) Times t10 to t11 It is assumed that the car 12 starts the ascending operation at the time t10. The speed of the DC motor 5 is controlled according to the speed pattern Sp in FIG. During this time, the DC motor 5 functions as a motor to accelerate the car 12 due to the running resistance and acceleration torque of the car 12. Therefore, since no regenerative power has been generated yet, the capacitor voltage Vc is charged by the main circuit storage battery 14 as shown in FIG.
b, and the field current is held at the reference value Ifc as shown in FIG. At time t11, DC motor 5 functions as a generator, and thereafter generates regenerative power.

(2) Times t11 to t12 The regenerative power is returned by the DC chopper circuit 4 to charge the smoothing capacitor 3. As shown in FIG.
The actual speed Sf rises following the speed pattern Sp, and accordingly, the capacitor voltage Vc rises to the capacitor voltage command value Vcp at time t12.

(3) Time t12 to t13 to t14 The capacitor voltage command value V is set by the speed pattern control circuit 52b.
cp and the capacitor voltage Vc are compared. The capacitor voltage Vc matches the command value Vcp at time t12, and thereafter exceeds the command value Vcp. The speed pattern control circuit 52b
In order to limit the regenerative power, calculation is performed based on equation (3), and the speed pattern Sp is reduced and output as shown by the solid line in FIG. The speed control circuit 46 controls the speed pattern S
The actual speed Sf of the DC motor 5 is reduced according to p. At time t13, the capacitor voltage Vc becomes the command value Vcp,
All the regenerative power is consumed by the DC motor 5. As a result, the car 12 is regeneratively braked and moves up and down at a constant speed. This state is continued until time t14 when deceleration is started.

(4) Time t14 to t15 When deceleration is started at time t14 in accordance with the speed pattern Sp, the deceleration torque is energized and the regenerative electric power is increased more than before. For this reason, the armature current Ia increases and the regenerative electric power is absorbed entirely by the DC motor 5. Although the regenerative power also decreases as the speed decreases, the capacitor voltage Vc is prevented from being discharged by the converter 2 and the DC chopper circuit 4 and holds the command value Vcp. When the user arrives at the nearest floor and stops at time t15, the smoothing capacitor 3 discharges to the voltage Vb.

According to the second embodiment, the first embodiment can be used.
Similarly, when the car 12 and the counterweight 13 are unbalanced and any of the heavy ones is lowered to land on the nearest floor, excessive regenerative power is generated by this lowering operation. When the terminal voltage Vc of the smoothing capacitor 3 exceeds a predetermined command value Vcp, the speed of the DC motor 5 is suppressed by reducing the speed pattern Sp to limit the regenerative power. Consumed entirely. Therefore, the car 12 can be driven to the nearest floor and landed according to the speed pattern Sp while regenerative braking is applied without causing the car 12 to overspeed. Also, as in the first embodiment, at the time of a power failure, the DC motor 5 is driven by the main circuit storage battery 14, so even if the car 12 and the counterweight 13 are balanced, the car 12 is moved to the nearest floor. Can be implanted.

In each of the above-described embodiments, the main circuit storage battery 14 is provided. However, the elevator is usually operated with one passenger 12a during most of the time except for the peak time at the time of commuting and leaving work and lunch. The car 12 is in a light extreme unbalanced state. Therefore, only the operation using the unbalanced weight without the main circuit storage battery 14 may be performed. In each of the above embodiments, the main circuit storage battery 14 is connected to the input side of the converter 2 during a power failure so that regenerative power does not flow. The connection may be made. As a result, the regenerative power is consumed in the DC motor 5 and the main circuit storage battery 14
Can also be charged. Further, in each of the above-described embodiments, the DC chopper circuit is configured by an IGBT. However, the present invention is not limited to this, and any switching element may be used.

[0032]

Since the present invention is configured as described above, it has the following effects. A first elevator power failure operation device according to the present invention converts a direct current smoothed by a smoothing capacitor into a variable voltage direct current by a DC chopper circuit to drive a direct current motor, and a counterweight and a slipper type. In an elevator in which a suspended car is raised and lowered, when a power failure occurs, a car or a counterweight is moved down to the floor by using the heavier one of the two, and a DC motor is provided. By controlling the field current of the DC motor, the terminal voltage of the smoothing capacitor of the DC circuit is maintained at a predetermined value, so that the regenerative power generated by the operation is consumed in the DC motor. For this reason,
Even if the regenerative electric power cannot be absorbed on the AC power supply side due to a power failure, the car can be smoothly raised and lowered while regenerative braking can be performed and landing can be performed without overspeeding the car.

A second elevator power outage operating device according to the present invention is such that one of the two elevators is driven down to the floor by descending the heavier one, and the speed pattern for controlling the speed of the DC motor is controlled. By controlling the terminal voltage of the smoothing capacitor of the DC circuit to a predetermined value by controlling, the regenerative power generated by the operation is consumed in the DC motor. For this reason, there is an effect that the car can be smoothly driven in accordance with the speed pattern and the car can be landed without applying the regenerative braking without causing the car to overspeed.

According to a third elevator power failure operation device according to the present invention, in the above first or second elevator power failure operation device, a DC motor is driven by a DC power supply when a power failure is detected by a power failure detection circuit. It is something to do. For this reason, when a power failure occurs, even if the car and the counterweight are balanced, the DC motor can be started by the DC power supply and the car can be landed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an entire operation device for a power failure of an elevator according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a main part of the first embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of the first embodiment of the present invention.

FIG. 4 is a block diagram showing an entire elevator power failure operation device according to Embodiment 2 of the present invention.

FIG. 5 is a block diagram showing a main part of a second embodiment of the present invention.

FIG. 6 is an operation explanatory view of Embodiment 2 of the present invention.

FIG. 7 is an explanatory diagram for analyzing the operation principle of the present invention.

FIG. 8 is a block diagram of a conventional elevator power failure operation device.

[Explanation of symbols]

1 three-phase AC power supply, 2 converter, 3 smoothing capacitor, 4 DC chopper circuit, 5 DC motor,
6 converter, 7 DC chopper circuit, 8 field winding, 9 rotating shaft, 10 hoisting machine, 11 main cable,
12 basket, 13 counterweight, 14 main circuit storage battery, 15 main circuit switch, 16 field circuit storage battery, 17 field circuit switch, 21 detection terminal, 2
2 Capacitor voltage detector, 23 DC current transformer, 2
4 Armature current detector, 25 DC current transformer, 26 field current detector, 27 encoder, 28 speed detector, 29 car load detector, 30 power failure control unit, 31 power failure detection circuit, 32 power supply switching circuit ,
33 stop position detection circuit, 34 operation direction determination circuit,
41 field current command generation circuit, 41a capacitor voltage command generation circuit, 41b field current command control circuit,
42 field current control circuit, 43 PWM circuit, 4
4 Gate drive circuit, 50 Power failure control unit, 51
Field current command generation circuit, 52 speed pattern generation circuit, 52b speed pattern control circuit.

Claims (3)

[Claims] 1. A direct current obtained by rectifying an alternating current from an alternating current power supply with a rectifier is smoothed by a smoothing capacitor, and a switching element and a diode connected in anti-parallel are further connected in a bridge form to form a forward / reverse circuit. A DC chopper circuit that performs DC voltage control in both directions, converts the smoothed DC into a variable voltage DC, drives a DC motor, and raises and lowers a basket suspended in a counterweight and a slidable manner. In the elevator, when the AC power supply fails, the AC power supply is activated to cut off the AC power supply, and a power failure detection circuit that supplies a field current to the DC motor. An operation direction determining circuit for operating the floor by lowering the heavier one of the counterweights; and a DC chopper circuit for generating regenerative power generated in the operation. And a capacitor voltage detecting circuit for detecting a terminal voltage of the smoothing capacitor, which fluctuates by being returned through the capacitor, and controlling the field current so that the terminal voltage becomes equal to or less than a predetermined capacitor voltage command value. An elevator power failure operation device comprising: a field current control circuit for causing the DC motor to consume regenerative power generated during operation. 2. A DC obtained by rectifying an AC from an AC power supply with a rectifier is smoothed by a smoothing capacitor, and a circuit element in which a switching element and a diode are connected in anti-parallel is further connected in a bridge form so as to be forward / reverse. A DC chopper circuit that performs DC voltage control in both directions, converts the smoothed DC into a variable voltage DC, drives a DC motor, and raises and lowers a basket suspended in a counterweight and a slidable manner. In the elevator, a power failure detection circuit that detects a power failure of the AC power supply and disconnects the AC power supply and supplies a field current to the DC motor, and operates by the power failure detection to operate the car and the counterweight. A driving direction determining circuit for lowering the heavier one to drive to the floor, and controlling the DC chopper circuit to move the car according to a predetermined speed pattern. A speed control circuit for raising and lowering, a capacitor voltage detection circuit for detecting a terminal voltage of the smoothing capacitor, which fluctuates when regenerative power generated in the operation is returned through the DC chopper circuit, A speed pattern control circuit for controlling the speed pattern so as to be equal to or lower than a capacitor voltage command value and causing the DC motor to consume regenerative power generated during the elevating operation; 3. A DC voltage equal to or less than a capacitor voltage command value is output, and is connected by a power failure detection of a power failure detection circuit.
3. The elevator power failure operation device according to claim 1, wherein a DC power supply for driving a DC motor via a C chopper circuit is provided on an input side of the rectifier.