JPH11299275A - Power unit for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accumulate the regeneration energy of a motor in a capacitor and to supply the regeneration power. SOLUTION: Commercial power is given to a motor 8 from a rectification means 3 and an inverter 6 through a smoothing capacitor 5. When a first voltage (V15) detected by a first voltage detection means 15 of the smoothing capacitor 5 is not less than first voltage which is previously decided, the regeneration power of the motor is absorbed and accumulated in a capacitor 14 via a converter 13. When a commercial power obtained by the first voltage (V15) and a first current (I17) detected by the first current detection means 17 of commercial power is not less than power, which is previously decided, power accumulated in the capacitor 14 is supplied to the motor via the converter 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator power supply device for supplying power to a motor for driving an elevator car up and down, and more particularly to an emergency power supply technology for load leveling, energy saving, and power failure. About.

[0002]

2. Description of the Related Art The mainstream of an elevator power supply main circuit uses a voltage type inverter which converts commercial AC power into DC power by a rectifier and converts this power into AC power having a variable frequency and a variable voltage. I have. In the power supply main circuit, regenerative power generated from the elevator car elevator motor raises the voltage of the DC electric circuit section of the main circuit via a diode included in the inverter. In the DC electric circuit part of the power supply main circuit, in order to prevent circuit destruction due to overvoltage of the DC electric circuit part with regenerative power, when the DC electric circuit part exceeds the set voltage, heat is consumed by resistors Means are provided for performing the operations. As described above, in a general elevator power supply circuit, regenerative electric power is currently consumed by the resistor, and improvement is required from the viewpoint of energy saving.

In the prior art of elevator load leveling,
There has been proposed a configuration in which a lead battery is connected to a DC electric circuit section of a power supply main circuit directly or via a converter, and power for driving the elevator car elevator is supplied from the lead battery.

In another prior art for saving energy using regenerative electric power of an elevator, a lead battery is connected to a DC electric circuit portion of a power supply main circuit. The regenerative electric power is charged into the electric power, and the electric power is reused for supplying power to the elevator car elevator motor.

[0005] In the prior arts of charging and reusing regenerative electric power using such a lead battery and supplying power from a lead battery to powering power of an elevator car elevating motor, the lead battery itself has low energy efficiency and excessive energy. The performance deterioration is promoted by the number of times of charging and discharging and the current burden. Therefore, replacement of the lead battery becomes frequent, resulting in poor economy.

As another prior art, there has been proposed a configuration in which an inverter for returning power from a DC electric circuit section of a power supply main circuit to a commercial AC electric circuit section is additionally provided. In the configuration in which the regenerative power is returned from the DC electric circuit section to the commercial electric circuit section by the inverter, the power running electric power of the elevator car elevating motor cannot be supplied.

[0007] Still another prior art is disclosed in Japanese Patent Application Laid-Open No. 4-236.
181. In this prior art, commercial power is rectified,
When power is supplied from the inverter to the elevator car elevating motor via the smoothing capacitor and the regenerative energy returns from the motor, the regenerative energy is absorbed by the regenerative power absorbing capacitor when the voltage of the smoothing capacitor exceeds a certain set value. To save energy. During power running of the motor, when it is detected that the voltage of the smoothing capacitor has dropped due to the power running, the power of the regenerative power absorption capacitor is periodically injected into the smoothing capacitor to supply power to the motor. The major problem of this prior art is that when the capacity of the commercial power supply is sufficiently large, the voltage of the smoothing capacitor does not drop when the elevator car elevating motor is running, so that the energy absorbed by the regenerative power absorption capacitor is supplied. Is not possible. As a result, it is insufficient to effectively regenerate the regenerative power and enhance the energy saving effect.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the energy saving effect by using the regenerative power of a motor for lifting and lowering an elevator car, to further reduce the capacity of a commercial power supply and to reduce the wiring capacity. It is an object of the present invention to provide a power supply device for an elevator, which is capable of improving maintenance efficiency and improving economic efficiency.

[0009]

According to the present invention, power from a commercial power supply is rectified by a rectifying means 3, smoothed by a smoothing capacitor 5, and further supplied via an inverter 6 to a motor for driving the elevator car up and down. In the elevator power supply device, the first voltage V15 of the smoothing capacitor 5
, A first current detecting means 17 for detecting a first current I17 from a commercial power supply, a capacitor 14 for absorbing regenerative power of the motor, and a smoothing capacitor 5 which are connected in parallel with each other. A converter 13 stores electricity in the capacitor 14 and feeds power from the capacitor 14, and the first voltage V 15 is set to a predetermined voltage V 0 by each output of the first voltage detecting means 15 and the first current detecting means 17.
When it is 1 or more, the regenerative power of the motor is absorbed by the capacitor 14 by the converter 13 and stored, and the first voltage V
15 is a power supply device for an elevator, wherein the converter 13 supplies the power of the capacitor 14 when the commercial power Pi determined by the power supply 15 and the first current I17 is equal to or higher than the predetermined power Pm.

The present invention also includes second voltage detecting means 16 for detecting the second voltage V16 of the capacitor 14, and second current detecting means 18 for detecting the second current I18 on the smoothing capacitor 5 side of the converter 13. , The capacitor 14
It is characterized in that power (= ΔV · I18), which is the product of the voltage increase ΔV of the smoothing capacitor 5 during regeneration and the second current I18, is supplied.

According to the present invention, a capacitor is connected to a power supply main circuit of a motor for raising and lowering a car of an elevator, and the regenerative power of the motor is charged to the capacitor via a converter. Aim. Further, the output of a capacitor is supplied to the power running power of the motor via a converter, so that the installed capacity and the wiring capacity of the commercial power supply can be reduced.

The capacitor can be charged and discharged a number of times, can be used for a large current load, has excellent energy efficiency, and has a relatively small configuration even with a large capacity. There are excellent advantages. This capacitor has a rated voltage of 2.3 V and a rated electric capacity of 12
80 capacitor cells of 00F are connected in series. As the capacitor cell, for example, a part number EECW2R3A128 (product name) manufactured by Matsushita Electronic Components Co., Ltd. can be used.

According to the present invention, when the first voltage V15, which is the voltage across the smoothing capacitor 5, is equal to or higher than the predetermined voltage V01, that is, when the regenerative power of the motor is generated, the control circuit 19 controls the converter. By the function of 13, the regenerative electric power is absorbed by the capacitor 14, charged and stored. Thereby, an energy saving effect is achieved.

The commercial power Pi of the commercial power source is changed to the first voltage V1
5 and the first current I17, or equivalently, the commercial power is obtained by a wattmeter. When the commercial power Pi is equal to or higher than the predetermined power Pm, the power of the capacitor 14 is supplied to the smoothing capacitor 5 by the converter 13. The supplied power is supplied to the motor 8 by the inverter 6. In the present invention, when the commercial power Pi is equal to the predetermined power P as described above,
When m is greater than or equal to m, replenishing electricity is supplied by the capacitor 14, so that the regenerative energy stored in the capacitor 14 can be reliably and effectively reused. Pm
Is, for example, the rated power of the commercial power supply equipment, or may be a predetermined value that is less than the rated power.

According to the present invention, when the voltage across the smoothing capacitor 5 described in connection with the prior art described above decreases, the power of the capacitor is not replenished, but the first voltage V1 is supplied.
5 and the first electric current I17
Is detected, and the power of the capacitor 14 is supplied.
For example, even when the equipment capacity and the wiring capacity of the commercial power supply are relatively large, the supply of power from the capacitor 14 is reliable, and the regenerative energy can be effectively reused.

As described above, in the power supply system according to the present invention, during the power running operation of the elevator car elevating motor, the commercial power is supplied from the commercial power supply so that the power is set to be smaller than the motor running power. It is also possible to supply the insufficient power from a capacitor via a converter. Furthermore, when the powering power of the elevator car elevating motor becomes smaller than the preset power for the commercial power, the preset power for the commercial power is transferred from the commercial power to the capacitor having a reduced storage amount. The difference between the power and the power running power of the motor can be given to the capacitor to be charged.

Further, according to the present invention as described above, the generation of the regenerative power of the motor causes the first
When the voltage V15 rises above the predetermined voltage V01, the power for raising the first voltage V15 is absorbed by the capacitor via the converter and charged, and the power of the capacitor is reused.

Further, the present invention includes means for detecting a power failure of the commercial power supply, and the control circuit responds to the output of the power failure detection means and supplies power to the capacitor by the converter.

According to the present invention, the power failure detection means
When a power failure of the commercial power supply is detected, the power of the capacitor is supplied by the converter and supplied to the motor. The energy stored in the capacitor in this way is reused for the power running power of the motor, so that the capacitor can be secured as an emergency power source even during a power outage, and the elevator can be used. Therefore, in the present invention, an emergency power supply function is achieved. Therefore, even if the elevator car loses power during ascent and descent, it is possible to land on the destination floor without leaving the car stopped, which is safe.

The capacitor has an electric capacity capable of supplying electric power required for powering operation of the elevator car elevating / lowering motor only by electric power stored in the capacitor when a commercial power supply fails. The capacitor may be a so-called assembled cell in which a plurality of cells are combined in parallel and connected in series.

Further, according to the present invention, the power failure detecting means responds to the output of the first voltage detecting means 15 to discriminate the level of the first voltage V15, and the first voltage V15 is changed to the predetermined voltage V01.
When the voltage is less than the predetermined power failure detection voltage V02 that is less than the power failure detection voltage V02, a means for determining that a power failure has occurred is included.

According to the present invention, in order to detect a power failure of the commercial power supply, when the output of the first detection means 15 for detecting the voltage between both ends of the smoothing capacitor drops to a voltage lower than the power failure detection voltage V02 (where V02 < V01), it is determined that a power failure has occurred, and the power is supplied to the smoothing capacitor side via a converter to drive the motor.

[0023]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. Power is supplied from the main circuit 1 to the motor 8 for driving the elevator 10 up and down. Cable 22 in the elevator 21
A car 10 for passengers or the like is connected to one end of the car, a counterweight 11 is connected to the other end, and the car 10 is wound around the car hoisting machine 9 in a so-called all-in-one manner. The counterweight 11 is set to, for example, about half the weight of the rated load including the car 10 and the passengers. Basket hoisting machine 9
Is driven by a motor 8. The motor 8 is, for example, an electric motor such as an induction motor.

In the main circuit 1, the commercial power from the commercial AC power supply 2 is rectified by the rectifying means 3 when the motor 8 is running, and is smoothed by the smoothing capacitor 5 provided in the electric circuit section 4. Electric power is supplied to the motor 8 via the motor 8 and the operation of the elevator 21 is performed. The regenerative electric power generated from the motor 8 when the car 10 is raised and lowered by the motor 8 is rectified by a diode or the like provided in the inverter 6, and the smoothing capacitor 5 is charged.
The voltage between 3 and 24 increases.

A capacitor 14 is connected to the lines 23 and 24 via a converter 13. Smoothing capacitor 5
The first voltage V15, which is a voltage between both ends, is detected by the first voltage detecting means 15. From the rectifying means 3 to the line 23,
24, the first current I17 supplied to the lines 23, 24
Upstream of the connection point of the smoothing capacitor 5 and the converter 13 (the left side which is the rectifying means 3 side in FIG. 1).
Is detected by the first current detecting means 17 connected to Converter 13 can be implemented using, for example, a diode.

A second voltage V 16, which is a voltage across the capacitor 14, is detected by the second voltage detecting means 16.
The second current detecting means 18 detects a second current I18 flowing through the line 25 of the converter 13 on the side of the smoothing capacitor 5. The control circuit 19 is realized by a microcomputer, for example, and has a memory 26. The output of the first and second voltage detecting means 15 and 16 and the output of the first and second current detecting means 17 and 18 are controlled by the control circuit 19. Given each,
Thus, the control circuit 19 controls the operation of the converter 13. The main circuit 1 is also connected to a power supply circuit 12 to which electric power is applied between the lines 23 and 24.
Power for operation is supplied to the control circuit 19 by the power from the second circuit.

FIG. 2 is a flowchart for explaining the outline of the overall operation of control circuit 19. Step a1
Then, the process proceeds to step a2, where the first voltage V15 is detected by the first voltage detecting means 15. In step a3, the detected first voltage V15 is set to a predetermined voltage V01.
It is determined whether this is the case (V01 <V15). This predetermined voltage V01 may be set to a predetermined value exceeding the rated voltage of commercial power supply 2. When it is determined in step a3 that the detected first voltage V15 is equal to or higher than the predetermined voltage V01, the regenerative energy generated by the motor 8 in the next step a4 is stored in the capacitor 1
The operation shown in FIG. 3 to be described later for charging, storing, and storing electricity is performed.

If it is determined in step a3 that the detected first voltage V15 is lower than the predetermined voltage V01, the process proceeds to the next step a6, in which the first voltage V15 is set.
It is determined whether the voltage V15 is equal to or higher than a predetermined power failure detection voltage V02 (V02 ≦ V15, where V02 <V01). If it is determined in step a6 that the first voltage V15 is equal to or higher than the power failure detection voltage V02, the process proceeds to the next step a7. In step a7, the electric power Pc of the electric power stored in the capacitor 14 is supplied to the lines 23 and 24 by the operation of the converter 13 from the capacitor 14, and supplied to the motor 8 together with the commercial AC power. In step a6, the first voltage V
When it is determined that the voltage is less than the power failure detection voltage V02, this indicates that a power failure has occurred, and in step a8, an operation during a power failure is performed as shown in FIG. Electric power is supplied to the motor 8 from the capacitor 14 so that the car 10 arrives at the destination floor.

The first and second voltages V15 and V16 detected by the first and second voltage detecting means 15 and 16 are stored in a memory 26 provided in the control circuit 19 at short predetermined cycles. At the same time, the first and second currents I17 and I18 detected by the first and second current detection means 17 and 18 are stored.

FIG. 3 is a flowchart for explaining the operation of the control circuit 19 for absorbing the regenerative power from the motor 8 to the capacitor 14 in step a4 of FIG. The regenerative electric power generated from the motor 8 is
, The voltage across the smoothing capacitor 5 of the DC electric circuit unit 4 is increased. In this case, converter 13 supplies power of voltage increase ΔV of DC electric circuit unit 4 to capacitor 14 by operation of control circuit 19 shown in FIG. 3 to cause capacitor 14 to absorb regenerative energy. The energy stored in the capacitor 14 is reused for the power running power of the motor 8. In step b2, a voltage increase ΔV during regeneration is calculated.

ΔV = V15−V01 (1) In step b3, the converter 13 detects the second voltage V16 detected by the second voltage detector 16 and the second current detector 18 by the operation of the control circuit 19. The second current I detected by the second current I18
18, the power of the voltage increase ΔV (= ΔV · I
18) to the capacitor 14 to be supplied with power. Thus, regenerative power is stored in the capacitor 14.

FIG. 4 is a flowchart for explaining the operation of the control circuit 19 in which the electric power from the commercial power supply 2 and the capacitor 14 is supplied to the motor 8 in step a7 in FIG. The process proceeds from step c1 to step c2, where the first voltage V15 detected by the first voltage detecting means 15 is used.
And the first current I17 from the AC power supply 2 detected by the first current detection means 17 are supplied to the control circuit 19 and read therefrom, and stored in the memory 26. Thereby, in step c3, the commercial power Pi is calculated. In another embodiment of the present invention, a wattmeter is provided on the lines 23 and 24 for detecting the commercial power from the commercial power supply 2 or provided on the commercial power supply 2 side of the rectifier 3 so that the commercial power supply can be detected. The power Pi may be obtained equivalently.

In step a4, it is determined whether the commercial power Pi is equal to or higher than the predetermined power Pm (Pi≥Pm), and if so, the process proceeds to the next step c5. The predetermined power Pm may be set to the rated power of the commercial power supply facility as described above, or may be set to a predetermined value that is less than the rated power.

In step c5, the power running power P of the motor 8
Insufficient power is supplied from the capacitor 14 by the operation of the converter 13 so as to supply power of the predetermined power Pm set to be smaller than i.

Pc = Pi−Pm (2) In order to supply the power Pc from the capacitor 14, the control circuit 19 controls the second voltage detected by the second voltage detection unit 16. V16 and the second current I18 detected by the second current detection means 18 are fetched and stored in the memory 26. In step c7, the control circuit 19 controls the converter 13 so that the power Pc is supplied by the second voltage V16 and the second current I18.

During the operation shown in FIG. 4, when the power running power Pi of the motor 8 becomes smaller than the set power Pm for the commercial power supply 2, the converter 13 calculates the difference power Pc by:
The charge is supplied from the capacitor 14.

FIG. 5 is a flow chart for explaining the operation of the control circuit 19 for operating the converter 13 so that power is supplied from the capacitor 14 to the motor 8 at the time of power failure of the commercial power supply 2 at step a8 in FIG. is there. The process proceeds from step d1 to step d2, and when a power failure occurs, the control circuit 19 takes in the outputs of the second voltage detecting means 16 and the second current detecting means 18 and stores them.
As for the power running power Pi of the motor 8, the outputs of the respective detecting means 15 to 18 are stored in the memory 26. Control circuit 19
Calculates the power running power Pi based on the stored contents of the memory 26 immediately before the power failure of the commercial power supply 2 occurs. Accordingly, in step d3, the control circuit 19 controls the converter 13 so that the power running power Pi immediately before the power failure is output from the capacitor 14 by the converter 13. As a result, electric power is continuously supplied to the motor 8 even after the commercial power supply 2 is cut off.
Resupply is performed without interruption of i. Therefore, the car 10 can be landed on the target floor.

FIG. 6 is a diagram showing the lapse of time of the electric power supplied to the motor 8 according to the embodiment of the present invention shown in FIGS. In the power running operation of the motor 8 in a state where the power failure of the commercial power source 2 has not occurred, a predetermined power Pm is supplied from the commercial power source 2, and the insufficient power Pc with respect to the power running power Pi of the motor 8 is reduced by the capacitor 14. Is supplied as described above. When a commercial power supply 2 power failure occurs, the motor 8
Is supplied with voltage from the capacitor 14. At the time of this power failure, electric power is also supplied from the capacitor 14 to the motor for opening and closing the door provided on the car 10.

[0039]

According to the first aspect of the present invention, the regenerative energy of the elevator car elevating motor is absorbed by the capacitor and stored, so that the energy saving effect can be achieved. The power of this capacitor can be used for make-up power for the motor running power, thus reducing the commercial power used. Moreover, the facility capacity and the wiring capacity of the commercial power supply can be reduced, for example, the capacity of the power receiving facility of the commercial power supply can be reduced.

Further, according to the present invention, when supplying power to the capacitor, the first voltage V15 and the first
Since the commercial power Pi obtained by the current I17 is compared with the predetermined power Pm to perform level discrimination, even if the capacity of the commercial power supply is large, the power saving effect of the commercial power can be achieved. In this way, the regenerative power can be absorbed by the capacitor and can be reused with high efficiency.

According to the second aspect of the present invention, the capacitor 1
4 is supplied by the power of the product of the increase ΔV of the voltage across the smoothing capacitor 5 and the second current I18 during regeneration.
Since the capacitor 13 absorbs the power by the converter 13, the regenerative power can be reliably stored, and there is no waste in storing the commercial power in the capacitor 14.

According to the third aspect of the present invention, it is possible to secure an emergency power supply at the time of a power failure of the commercial power supply. You can land on the destination floor.

According to the fourth aspect of the present invention, when the voltage V15 across the smoothing capacitor detected by the first detecting means 15 at the time of a power failure of the commercial power supply has dropped below the power failure detection voltage V02, the level is discriminated. Since it is determined that a power failure has occurred, the first detection means 15 can be used not only for charging and discharging the capacitor 14 in normal times when the commercial power supply does not cause a power failure, but also for detecting the power failure as described above. The configuration can also be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for describing an outline of an overall operation of a control circuit 19;

FIG. 3 is a control circuit 19 for absorbing regenerative power from the motor 8 into a capacitor 14 in step a4 of FIG.
5 is a flowchart for explaining the operation of FIG.

FIG. 4 is a flowchart for explaining the operation of a control circuit 19 in which electric power from the commercial power supply 2 and the capacitor 14 is supplied to the motor 8 in step a7 of FIG.

5 is a diagram showing a commercial power supply 2 in step a8 in FIG. 2;
Control circuit 1 that operates converter 13 so that power is supplied from capacitor 14 to motor 8 when a power outage occurs
9 is a flowchart for explaining the operation of FIG.

FIG. 6 is a diagram showing a lapse of time of electric power supplied to the motor 8 according to the embodiment of the present invention shown in FIGS. 1 to 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main circuit 2 Commercial AC power supply 3 Rectifier 4 Electric circuit 5 Smoothing capacitor 6 Inverter 8 Motor 9 Car hoist 10 Car 11 Counter weight 12 Power supply circuit 13 Converter 14 Capacitor 15 First voltage detecting means 16 Second voltage detecting means 17 First current detecting means 18 Second current detecting means 19 Control circuit 21 Elevator

Claims (4)

[Claims] An electric motor from a commercial power supply is rectified by a rectifying means to a motor for driving an elevator car up and down,
Smoothing is performed by the smoothing capacitor 5 and the inverter 6
A first voltage detecting means 15 for detecting a first voltage V15 of the smoothing capacitor 5; a first current detecting means 17 for detecting a first current I17 from a commercial power supply; A capacitor connected to the smoothing capacitor in parallel with the capacitor for absorbing regenerative electric power, and a converter for storing power in the capacitor and supplying power from the capacitor to the first voltage detecting means and the first current detecting means; When the first voltage V15 is equal to or higher than the predetermined voltage V01, the regenerative power of the motor is absorbed by the capacitor 13 by the converter 13 and stored, and the first voltage V15
And the first electric current I17
A power supply device for an elevator, wherein the converter 13 supplies power to a capacitor 14 when i is equal to or higher than a predetermined power Pm. 2. A second voltage detecting means 16 for detecting a second voltage V16 of the capacitor 14, and a second current I18 on the smoothing capacitor 5 side of the converter 13.
And a second current detecting means 18 for detecting the current. The capacitor 14 has a power (= ΔV · I) which is the product of the voltage increase ΔV of the smoothing capacitor 5 during regeneration and the second current I18.
18. The elevator power supply according to claim 1, wherein the power is supplied to the elevator. 3. The power supply system according to claim 1, further comprising means for detecting a power failure of a commercial power supply, wherein the control circuit supplies power to the capacitor by the converter in response to an output of the power failure detection means. Elevator power supply. 4. The power failure detection means responds to the output of the first voltage detection means 15 and responds to an output of the first voltage V15.
And means for discriminating that a power failure has occurred when the first voltage V15 is lower than the predetermined power failure detection voltage V02 which is lower than the predetermined voltage V01. An elevator power supply as described.