JP2000318939A - Power levelling device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power system for an elevator contriving a great energy saving effect and effective use of inexpensive contract demand and regenerative power for reduced operating cost, environment conservation and further improved reliability in emergency. SOLUTION: A power levelling device for an elevator has a motor 8 for driving an elevator, a capacitor 2 for storing power supplied from a system power supply 1 and a controller 5 for supplying power from at least one of the system power supply 1 and the capacitor 2 to the motor 8. In the controller 5, signals are automatically or manually issued to properly combine or switch two powers as required for storing the power regenerated in moving the elevator in the capacitor 2, and when the system power supply 1 is cut, the power of the battery 2 is supplied to the motor 8 or an emergency lamp. The power of the capacitor 2 is always monitored by a capacitor controller 9 and storage power, if over a set value, is supplied from the system power supply 1 to the capacitor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator power leveling device, and more particularly to an elevator power leveling device provided with an elevator power supply system for leveling output power.

[0002]

2. Description of the Related Art Conventionally, there are elevators for passengers, luggage or shared cargo, and there are various types of elevators from high-rise building elevators to home-use home elevators. In this type of elevator, a vehicle called a car that lifts and lowers a person or an object is attached to one end of a cable, a weight is attached to the other end, and an elevator drive motor via a drive gear and the like is arranged in the middle between them. . Such an elevator drives the cable up and down via the motor in such a manner as to balance the car side and the weight side.

[0003] Generally, the weight of the weight is set so as to keep a balance with the total weight of the car obtained by adding one half of the loaded weight to the weight of the car. When the total weight of the car is greater than the weight of the weight, when the car is to be lifted, drive power is supplied to the motor, and the car moves up to the destination floor. When lowering the car under the same conditions, drive power is supplied to the motor until a predetermined speed is reached, but finally, by regenerative braking,
Electric power larger than the added total driving electric power is generated as regenerative electric power. On the other hand, when the total weight of the basket is smaller than the weight of the weight, the above-described operation works in reverse. Conventionally, the regenerative power is converted to heat by a resistor and consumed, or returned to a system power supply.

[0004]

However, as described above, the method of converting the regenerative electric power into thermal energy in the resistor and dissipating it to the surrounding space has a simple structure, but does not reuse the electric power. Since power is not consumed, power is wasted and power cannot be saved. Moreover, the environment is adversely affected in the sense of global warming, which is not preferable.

On the other hand, the method of returning the regenerative electric power to the system power supply effectively reuses the electric power, but has a disadvantage that the equipment cost and the like increase.

[0006] In the event of a disaster such as an earthquake or a fire, or a power outage, the power supplied to the elevator may be interrupted. In the event of such a disaster or power outage, a situation may occur in which a person is trapped in the elevator car. In order to avoid the occurrence of such a situation, in many cases, when the system power supply is cut off, a system in which electric power is supplied from the storage battery to emergency lights and communication communication devices, or to the nearest floor. Has been adopted.

However, most of the above-mentioned electric storage devices use chemical batteries having a short life, such as lead-acid batteries, and when sufficient capacity is lost in an emergency and required functions cannot be instantaneously exhibited. There were many and had many problems.

The present invention has been made in order to solve the above-mentioned conventional problems, and has a specific object to realize a large energy saving effect, effective use of system power and regenerative power, reduction of operation cost, An object of the present invention is to provide an electric power leveling device for an elevator, which improves environmental integrity and reliability in an emergency.

[0009]

The above object is effectively achieved by the inventions described in claims 1 to 4 of the present application. The invention according to claim 1 of the present application includes a storage battery and a controller that distributes or switches at least one of the system power and the power of the storage battery to the elevator drive motor. The regenerative electric power from the elevator drive motor is stored in the elevator electric power leveling device.

According to the present invention, both or one of the system power and the storage power of the storage battery is efficiently used as the power to be supplied to the elevator drive motor. Both of the regenerative power from the motor are stored. That is, in the normal operation, the elevator is driven with a small contract electric power, and the shortage of the supplied electric power is supplemented by the electric power or the like stored in the electric storage device. In such a case, the distribution and switching of the power are automatically performed according to a command from the controller. Of course, the distribution and switching can be performed manually.

More specifically, when the elevator is moved up and down, for example, when the total weight of the car is lower than the weight of the elevator, or when the total weight of the car is lower than the weight of the elevator, the elevator drive motor is driven. Function as a regenerative brake, that is, a generator, and convert the rotational energy of the motor into electric energy. At this time, a signal for returning the electric power generated from the motor to the electric storage device as regenerative electric power is issued from the controller, and charging and discharging of the electric storage device are leveled. Note that a single elevator drive motor can be used as the generator, but the elevator drive motor and the generator can be separately arranged.

According to the present invention, since the controller supplies the motor with either or both of the system power and the storage power of the battery, the power supplied to, for example, a plurality of elevators is leveled. Becomes possible. As a result, the contract power can be used effectively. In addition, the regenerative electric power is returned to the storage battery without being returned to the heat energy and diffused to the outside as in the related art, so that the regenerative electric power can be effectively used. Furthermore, since it is not necessary to dissipate the regenerative electric power into the air, the environmental preservation is sufficiently secured.

According to a second aspect of the present invention, when the system power is cut off, the controller has switching means for switching to supply of the storage power of the storage battery instead of the system power as emergency power. .

According to the present invention, during normal operation, the elevator is driven with a small contract power as described above, and the shortage of the supplied power is supplemented by the power stored in the electric storage device or the like. When the system power supply is cut off in an emergency such as a disaster or a power outage, the switching means of the controller instantaneously switches to the electric power stored in the storage battery, and the electric power is used to drive the nearest floor and the emergency light. It is possible to smoothly respond to lighting or the like. Therefore, emergency reliability is sufficiently ensured.

In the invention according to claim 3, for example, a flywheel battery is employed as the electric storage device. By employing a flywheel battery, it is possible to use the battery for a long period of time at a low cost of equipment, and it is possible to quickly exert sufficient capacity in an emergency.

According to a fourth aspect of the present invention, a carbon fiber reinforced plastic material is applied to the rotor of the flywheel battery. Flywheels composed of carbon fiber reinforced plastic materials have a higher weight energy density than metal materials.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The present invention is shown in FIG.
And an elevator power leveling device including the elevator power supply system shown in FIG. FIG. 1 is a system block diagram showing a basic configuration of an apparatus according to the present invention.

As shown in FIG. 1, the electric power from the system power supply 1 is temporarily stored in the electric storage device 2 via the electric storage controller 9. The amount of power stored in the power storage device 2 is managed by the power storage controller 9 so that storable power is always secured.
In addition, the life can be grasped and managed by monitoring the amount of natural discharge during non-operation, and a warning indicator such as a buzzer or a lamp can be displayed as necessary.

When the car 3 is lifted when the car 3 side of the elevator is heavier than the weight 4, the power from the system power supply 1 is supplied to the inverter 6 through the rectifier 7 according to a command from the elevator controller 5, and the elevator driving motor 8
Rotates. If insufficient power occurs during this drive,
The elevator controller 5 calculates the power shortage,
The shortage of electric power is instantaneously supplied from the electric storage device 2. Thereby, the basket 3 is moved to the target floor.

Next, when the car 3 is lowered when the car 3 side of the elevator is heavier than the weight 4, the power of the system power supply 1 is supplied to the inverter 6 by the command of the elevator controller 5 until the car 3 reaches a predetermined speed. And drives the motor 8 to rotate. If insufficient power occurs during this driving, the elevator controller 5
Calculates the amount of power shortage and causes the power storage device 2 to supply the shortage power instantaneously.

Thereafter, when the car 3 is stopped at the target floor, the car is stopped by a mechanical brake, but the motor 8 is operated as a generator from a predetermined speed until immediately before the stop.
For example, the motor 8 is sufficiently decelerated by generating regenerative electric power. The regenerative power generated at this time is smoothly stored in the electric storage device 2 and used for the next operation.

According to this embodiment, for example, when the elevator is moved up and down, the motor 8 is operated as a regenerative brake, that is, a generator, and the rotational energy of the motor 8 is converted into electric energy. At this time, the electric power generated from the motor 8 by the elevator controller 5 is returned to the electric storage device 2 as regenerative electric power. In this way, since the regenerative electric power is stored in the electric storage device 2, the rotational energy of the motor 8 can be effectively used without waste. Therefore, the energy saving effect is extremely large. In the present embodiment, the motor 8 is also used as the generator, but it can be switched when necessary by connecting the motor 8 and the generator.

In the system of the present invention, for example, it is assumed that the contract power of the system power supply 1 is smaller than the load power of the motor 8, and the sum of the supply power of the battery 2 and the contract power of the system power supply 1 is The system is constructed so as to be larger than the maximum load power. If the elevator is not operated for a long period of time, the electric power of the electric storage device 2 becomes insufficient due to discharge or the like, and the sum of the electric power of the electric storage device 2 and the electric power of the system power supply 1 reduces the maximum load power of the motor 8 It is also assumed that the vehicle will fall below that and hinder driving. For this reason, the system is constructed such that the electric energy of the electric storage device 2 is constantly monitored by the electric storage controller 9 and when the electric power is likely to be insufficient, the electric power can be supplied from the system power supply 1 to the electric storage device 2. .

Further, since the electric energy of the electric storage device 2 is constantly monitored by the electric storage controller 9, even if the power from the system power supply 1 is cut off in an emergency such as a power failure or a disaster, the electric storage device 2 can be monitored.
Power can be instantaneously and reliably supplied, and the car 3 can be driven to the nearest floor, used for turning on an emergency light, and the like. Furthermore, the power storage controller 9
It is possible to constantly monitor the state of the electric storage device 2, so that the life of the electric storage device 2 can be grasped,
The replacement work and maintenance management can be easily performed without missing the replacement time.

Hereinafter, the power leveling device for an elevator according to the first and second exemplary embodiments of the present invention using the above system will be described in detail with reference to FIG. FIG. 1 is a system block diagram for explaining an elevator power supply system applied to an embodiment of the present invention. In addition,
In the embodiment shown in FIG. 2, any of the accumulators will be described using a flywheel battery as an example, but the present invention is not limited to this, and a lead storage battery, a sodium-sulfur storage battery, a lithium storage battery, or the like can be applied. . Further, the system power supply includes a case where a part of electric power is supplied not only to an elevator drive but also to, for example, an electric lighting device and an electric appliance.

According to the elevator power leveling apparatus of the first embodiment according to the present invention, an elevator power supply system having a configuration as shown in FIG.
And a flywheel battery having a rotor made of SS400 as storage battery 2 (manufactured by Nippon Flywheel: 2K
VA).

The flywheel battery 2 includes a flywheel battery controller 90, an inverter 1
0 and flywheel 11 with motor / generator
It has. The flywheel 11 of the flywheel battery 2 is made of a carbon fiber reinforced plastic material (CFR).
P). The flywheel 11 made of carbon fiber reinforced plastic material has a higher weight energy density than the flywheel made of metal material.

In this embodiment, the flywheel battery controller 90 controls the flywheel 11
The motor is set to stand by at 500 rpm, and the minimum rotation speed when discharging power is set to 3,000 rpm or more. For example, when the regenerative power from the motor 8 is stored, the maximum rotation speed is 5 rpm. , 500 r.pm or less.

Further, when the rotation speed of the flywheel 11 is 4,
If the speed falls below 500 rpm, the flywheel battery controller 9a supplies a small amount of power from, for example, the system power supply 1 only when the elevator is not operated.
It is set so as to maintain the rotation speed of 500 rpm. The elevator controller 5 controls the system power supply 1 and the flywheel battery 2a in consideration of the amount of driving and movement of the car 3 and the amount of power stored in the flywheel battery 2a.
Is calculated so as to optimize the leveling of the power.

The car 3 and the weight 4 of the elevator are set so that the car 3 is always heavier. In addition, as described above, when the system power supply 1 is used for power supply of, for example, an electric lighting device and an electric appliance,
The distribution of the amount of power supplied to the system power supply 1 and the flywheel battery 2a is set.

Under the above set conditions, the 3 kW motor 8
In order to raise the car 3 by driving the car, the elevator controller 5 replenishes the shortage of the power of 2 KVA supplied from the system power supply 1 through the rectifier 7 from the flywheel battery 2 a through the rectifier 7. .
The output power from the system power supply 1 and the output power from the flywheel battery 2a are supplied to the motor 8 via the inverter 6.
And the cage 3 was driven to a predetermined position. Then
At this time, the rotation speed of the flywheel 11 is 4,500 r.
pm to 3,850 rpm.

Next, when a command is issued from the elevator controller 5 to lower the car 3 to return to the original position, the initial drive power of the motor 8 is supplied only from the flywheel battery 2a, and finally, The regenerative electric power from the motor 8 was stored in the flywheel battery 2a. At this time, the rotation speed of the flywheel battery 2a recovered from 3,850 rpm to 4,600 rpm.

Further, when the system power supply 1 was shut off and a command was issued from the elevator controller 5 to move the car 3 by a predetermined amount, the car 3 was moved by a predetermined amount and stopped. At this time, the rotation speed of the flywheel 11 was reduced from 4,600 rpm to 4,000 rpm. The same operation was performed even if such an operation was repeated one million times.

According to the elevator power leveling apparatus according to the second embodiment of the present invention, an elevator power supply system having a configuration as shown in FIG.
And a flywheel battery 2 having a CFRP rotor as a power storage device (Mitsubishi Rayon: 20KV
A) can be adopted. This flywheel battery 2
Is provided with a flywheel battery controller 9a, an inverter 10, and a flywheel 11 mounted with a motor / generator that rotates in a vacuum vessel.

In the second embodiment, the flywheel battery controller 9a
Is set to stand by at 28,000 rpm, and the minimum number of revolutions when power is released is set to 10,000 rpm or more. Further, for example, the maximum number of revolutions when the regenerative electric power from the motor 8 is stored is set to be 35,000 rpm or less. Further, for example, when the rotation speed of the flywheel 11 falls below 28,000 rpm, the flywheel battery controller 9a supplies a small amount of power from the system power supply 1 only when the elevator is not operated. 000r.pm is set.

The elevator controller 5 calculates the distribution of the amount of power supplied from the system power supply 1 and the flywheel battery 2b in consideration of the amount of driving and movement of the car 3 and the amount of power stored in the flywheel battery 2, so that the power level is reduced. It is set to be optimal. The car 3 and the weight 4 of the elevator are always set in a state where the car 3 is heavier.

Under these set conditions, the motor 8 of 20 kW is driven to raise the car 3. In accordance with a command from the elevator controller 5, the power of 7 KVA from the system power supply 1 through the rectifier 7 and the power output from the flywheel battery 2 for replenishing the insufficient power are combined, and the total power is transmitted via the inverter 6. The car 3 was supplied to the motor 8 and the car 3 was driven to a predetermined position. The rotation speed of the flywheel 11 at this time is 28,000 rpm
To 19,500 rpm.

Next, when a command is issued from the elevator controller 5 to lower the car 3 to return it to the original position, the initial drive power of the motor 8 is supplied only from the flywheel battery 2 and ultimately The regenerative electric power from the motor 8 was stored in the flywheel battery 2. At this time, the rotation speed of the flywheel battery 2b is 1
It recovered from 9,500 rpm to 26,300 rpm.

Further, when the system power supply 1 was cut off and a command was issued from the elevator controller 5 to move the car 3 by a predetermined amount, the car 3 was moved by a predetermined amount and stopped. At this time, the number of rotations of the flywheel 11 is 26,300 rpm to 20,
The operation decreased to 500 rpm. Such an operation is 1
The same operation was performed even after the repetition of one million times.

As is clear from the above description, according to the elevator power leveling apparatus of the present invention, the same operation as the conventional one can be realized with the contract power smaller than the motor capacity, and the power leveling is achieved. It is possible to construct an elevator power supply system that effectively achieves a reduction in running costs and good environmental conservation. It should be noted that the present invention is not limited to the above-described embodiments, but naturally includes a technical range that can be easily changed by those skilled in the art from those embodiments.

[Brief description of the drawings]

FIG. 1 is a block diagram of a basic elevator power supply system applied to an elevator power leveling device according to the present invention.

FIG. 2 is a block diagram showing an elevator power supply system applied to an elevator power leveling apparatus according to a representative embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 System power supply 2 Electric storage battery (flywheel battery) 3 Basket 4 Weight 5 Elevator controller 6 Inverter 7 Rectifier 8 Motor 9, 9a Flywheel battery controller 10 Inverter 11 Flywheel

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H02K 7/02 H02K 7/02 5H607 F term (Reference) 3F002 GA03 GA07 3F304 CA05 EC00 EC03 5G003 AA01 BA01 DA07 GB06 5G015 GA06 JA26 JA27 JA52 5G066 JA07 JB02 JB03 5H607 BB01 CC07 EE41

Claims (4)

[Claims] 1. An electric storage device, comprising: a controller for distributing or switching at least one of system power and electric power of the electric storage device to an elevator drive motor; An electric power leveling device for an elevator, wherein regenerative electric power from a drive motor is stored. 2. The elevator power leveling device according to claim 1, wherein when the system power is cut off, the controller has switching means for switching to supply of stored power of the storage battery as emergency power. 3. The power leveling device for an elevator according to claim 1, wherein the storage battery is a flywheel battery. 4. The power leveling device for an elevator according to claim 3, wherein the rotor of the flywheel battery is made of a carbon fiber reinforced plastic material.