JPH03186581A - Noise control device for elevator - Google Patents

Abstract

PURPOSE:To positively prevent noise by providing a corresponding series resonance circuit on the outside of a converter and an inverter constituting VVVF power source of an elevator depending on the generation of high frequency components contributing to noise. CONSTITUTION:Using VVVF obtained by forward-converting a commercial three-phase power source 1 by an converter 2 and by backward converting it by an inverter 4, an A.C. motor 5 is driven by a command from a control circuit 900 to lift and lower a cage 8. Series resonance circuits 30, 40, 50 which are turned on and off by BPF 100 and transistors Tr 34, 44, 54, are provided on the output side of the converter 2. Series resonance circuits 60-62, 70-72, and 80-82 which are turned on and off by BPF 200-400 and Tr 604-606, 704-706 and 804-806 are connected between respective phases on the output side of the inverter 4. When the control circuit 900 detects high frequency components, Tr of the resonance circuit corresponding to the high frequency is selected to be turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elevator noise suppression device, and more particularly to an elevator noise suppression device suppressed by a static converter or an inverter.

[Conventional technology]

Conventionally, in a DC elevator using a DC motor as a drive device, a motor generator has been employed as a power source for the motor.

This motor generator uses commercial power to rotate a three-phase induction motor, and the rotation drives a DC generator to obtain DC voltage, which is used as a power source for the DC motor. However, with this method, there is a loss due to the efficiency of the induction motor DC generator.
In line with the trend toward energy conservation, motor generators are being replaced with static converters such as three-phase full-wave Iristor bridges. However, a new problem arises when using this static converter. That is, one of them is the noise generated by the drive motor. In the case of a motor generator, the ripple component included in the DC voltage is the so-called commi ripple, whose frequency is 300 kHz that exists in a static converter.
Hz (the power supply frequency is much higher than 601 Hz (360 Hz in the case of z), and the ripple rate is also very small.

Also, although the absolute value of noise from a three-phase induction motor is large, it is so-called white noise and is not unpleasant to the ears, but static converters have a peak at a specific frequency, so
This may cause discomfort to passengers riding in the cage.

Therefore, a series resonant circuit that serves as a parallel shunt for harmonics caused by the number of rectified phases may be provided. This circuit prevents harmonic components from flowing into the armature of the DC motor, so it can be said to be a very effective means for dealing with this frequency component. Also, on the other hand, this static converter can be used as an alternative to elevators.

In recent years, AC elevators that linearly control induction motors using inverter devices have appeared and are becoming mainstream. This AC elevator also had the above-mentioned problem, and in order to solve this problem,
It has been confirmed that this can be achieved by connecting a series resonant circuit as disclosed in Japanese Patent No. 7 in parallel with the converter and inverter.

[Problem to be solved by the invention]

By the way, there is no fluctuation in the power supplied by the power company,
Furthermore, it is well known that if there is a margin, or if the capacity of the converter and inverter is extremely large compared to the load factor, the load on the converter and inverter is reduced and the generation rate of harmonic components is also reduced. Therefore, if a series resonant circuit is always formed as in the conventional technology mentioned above in such a situation, the amount of power consumed by this circuit will be significant, and in recent years, energy saving measures have been called for. The disadvantage is that it cannot meet the needs.

SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator noise suppression device that has an energy saving effect and can suppress noise due to harmonic components.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an elevator noise suppression device in which an AC motor is driven by variable voltage, variable frequency AC power to operate a car.
A series resonant circuit for a converter is made up of multiple series resonant circuits that serve as parallel shunts for high-frequency components that generate noise due to the output from the converter that converts AC power to DC power. A plurality of series resonant circuits are provided on the output side of the converter and serve as parallel shunts for high frequency components, each of which is a source of noise generation due to the output from the inverter that converts DC power from the converter into AC power. When a series resonant circuit for the configured inverter is provided between the lines on the output side of the inverter, and each high frequency component that is the source of the noise caused by the output from the converter and the inverter is detected, a detection means adapted to emit a corresponding output signal is provided on the output side of the converter and inverter;
Each series resonant circuit is provided with means for forming a corresponding series resonant circuit in response to the output signal output from the detection means, and noise due to high frequency components is suppressed by these series resonant circuits. It is characterized by

[Effect]

In the present invention, a series resonant circuit corresponding to the high frequency component that is a source of noise generation from the converter and inverter is formed only when the high frequency component is generated.

It becomes possible to implement an elevator noise suppression device that can reliably suppress noise and has excellent economic efficiency and noise suppression effects that can sufficiently achieve energy saving effects.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a circuit diagram of essential parts showing an embodiment of an elevator noise suppression device of the present invention.

In Fig. 1, 1 is a commercial three-phase AC power supply, 2 is a converter that converts the commercial three-phase AC power supply 1 into a DC power supply, for example, a converter composed of a thyristor, and 3 is a converter that smoothes the DC power output from the converter 2. 4 is a DC reactor for converting the DC power output from the converter 2 to a variable voltage based on the speed command number (not shown);
an inverter that converts and outputs variable frequency AC power, 5
is an AC motor driven by the above-mentioned AC power output from the inverter 4; a drive device 6 is connected to this AC motor 5, and the main rope 7 is connected via this drive device 6. A cage 8 and a counterweight 9 are provided. 30.40 and 50 are converter 2
First, second, and third series resonant filters provided to absorb first, second, and third high frequency components of predetermined values, respectively, which are noise sources caused by the DC power output from the 31.32.33 is this series resonant filter 3
Similarly to the first series resonant filter 30, the second and third series resonant filters 40.50 are also comprised of a reactor, a capacitor, and a resistor. 34, 44 and 54 are electrically connected to the first, second and third series resonant filters 30, 40 and 50 in parallel with the output side of the converter 2, respectively, when a control signal is input to the base. Transistors connected like 60.70.80 and 61.71.
81, and 62, 72, and 82 are provided to absorb the fourth, fifth, and sixth high frequency components of predetermined values, respectively, which are noise sources caused by the above-mentioned AC power output from the inverter 4. The fourth series resonant filter 60, 70 and 80 corresponds to the harmonic components of the reactors 601 and 701.
．． 801 and capacitor 602.702.802 and resistor 6
03,703.803, and the other fifth and sixth series resonance filters 61.71.81 and 62.72.82 corresponding to the fifth and sixth harmonic components are the fourth series resonance filters. Like the filters 60 and 70, it is composed of a reactor, a capacitor, and a resistor. 604.704.
804 and 605.705.805 and 606.706
．． When a control signal is input to the base of 806, the fourth, fifth, and sixth series resonant filters 60, 70, .
80, 61, 71.81 and 62.72.82, transistors connected so as to be electrically conductive between respective corresponding lines on the output side of the inverter 4;
100 is due to the DC voltage output from converter 2.

A bandpass filter configured to emit an output signal corresponding to each harmonic component when detecting the I-th, second, and third harmonic components of respective predetermined values superimposed on the DC voltage, 200°300.400 is caused by the above-mentioned AC power output from the inverter 4, and is superimposed on this AC power. It is a bandpass filter configured to emit an output signal corresponding to each harmonic component when the fifth and sixth harmonic components are respectively detected, and the outputs from these bandpass filters 100, 200, 300 and 400 are The signals are connected to each transistor 34.44.
54 and 604,605°606 and 704,705.70
6 and 804.805.806 to a control circuit 900 that sends control signals in response to the signals.

Next, the operation of the present invention will be explained. Now, when the elevator Ka-8 runs in response to the call.

Converter 2 and inverter 4 operate to supply power to each of them, and at this time, if harmonic components that are noise generation sources are superimposed on the respective power supply waveforms, these superimposed harmonic components are transmitted to each band filter. 100,200.
300 and 400, this detection signal is input to the control circuit 900, and from the control circuit 900, each transistor 34.44.54, 604.605.60
A control signal is sent to the bases of 6.704.705.804, 805 and 806, and in response each transistor 34.44.
,704,705,706°804.805 and 80
6 is connected to each series resonant filter 30, 40, 50, 60, 61, 62, 70 with conduction between the emitter and collector.
．． 71゜72.80.81 and 82 are electrically connected between the lines on the output side of the converter 2 and inverter 4 to form a circuit that shunts the above-mentioned harmonic components in parallel. The wave components are generated by these series resonant filters 30.40.50.60°61.62.70.7
1.72.80.81 and 82, and can suppress noise due to harmonic components.

On the other hand, if harmonic components are not superimposed on the voltage output between each line on the output side of the inverter 4 in the converter 2, no output signal is emitted from each band filter 100°200, 300, 400. Therefore, from the control circuit 900, each transistor 34, 44, 54, 604, 605
,606°704.705,706,804.805.
No control signal is issued to 806, and each series resonant filter 30.40.50.60.61.62.70.71
．． 72.80.81.82 are not electrically connected, so these series resonant filters 30.40.50.60,6
1.62.70.71.72.80.81.82 will no longer consume power. Moreover, each band filter 100,
Only when a harmonic component superimposed on the output power source of 200°300.400 is detected, its output signal is input to the control circuit 900. As a result, only the corresponding series resonant filters are electrically connected, so
Since the amount of power consumption is only added, the energy saving effect is extremely large b).

Therefore, as explained above, in this embodiment, since a series resonant circuit is provided to absorb each harmonic, harmonics can be absorbed over the entire range, and an extremely large noise suppression effect can be obtained. Since only the series resonant circuit corresponding to the generation of the wave component is connected, and other series resonant circuits are not connected, it is possible to realize a noise suppression device that can achieve appropriate noise suppression and energy saving effects.

〔Effect of the invention〕

As explained above, according to the present invention, a corresponding series resonant circuit is formed only when a high frequency component is generated as a source of noise from the converter and inverter, respectively. Therefore, it is possible to reliably suppress noise and achieve a sufficient energy saving effect, thereby making it possible to realize an elevator noise suppressing device that is excellent in economy and noise suppressing effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of an embodiment of an elevator noise suppression device according to the present invention. 1... Commercial three-phase AC power supply, 2... Converter, 3...
...DC reactor, 4...Inverter, 5...AC motor, 6...Drive device, 7...Main rope, 8...
Basket, 9... Counterweight, 30.40.50.616
2.70.71.72.80.81.82...Series resonant filter, 31.601.701.801...Reactor, 32.602,702,802...Capacitor, 33.603,703. 803...Resistance, 34.
44.54,604,605.606,704°705
．． 706.804.805.806...Transistor, 100.200.300.400...Band filter, 900...Control circuit.

Claims (1)

[Claims] (1) In an elevator noise suppression device that uses variable voltage, variable frequency AC power to drive an AC motor to operate a car, noise caused by the output from the converter that converts AC power to DC power, A series resonant circuit for the converter, which is composed of a plurality of series resonant circuits that serve as parallel shunts for respective harmonic components that cause noise generation, is provided on the output side of the converter, and , a series resonant circuit for an inverter constituted by a plurality of series resonant circuits serving as parallel shunts of respective harmonic components that cause noise generation is provided between the lines on the output side of the inverter, and the A detecting means is provided on the output side of the converter and inverter, and is configured to emit an output signal corresponding to each harmonic component that is a source of noise generation due to the output from the converter and inverter when it is detected, Each series resonant circuit is provided with means for forming a corresponding series resonant circuit in response to an output signal output from the detection means, and these series resonant circuits suppress noise due to harmonic components. An elevator noise suppression device characterized by: