KR100455405B1 - System and method for reducing noise of elevator at midnight by reducing control frequency of three-phase induction motor for driving elevator - Google Patents

Abstract

The present invention relates to a system and method for decelerating an elevator by reducing the control frequency of an elevator driving three-phase induction motor to 1/2 to reduce noise generated at night when the surroundings are quiet. Operation time determination unit (2) for judging night operation time and daytime operation time, and command of an elevator driving motor corresponding to the corresponding operation week by dividing the operation speed of the elevator into acceleration operation week, high speed operation week, and deceleration operation week. According to the central processing unit (CPU) 1 indicating the frequency fo, the command frequency fo of the central processing unit (CPU) 1, and the traveling time determination signal of the traveling time determining unit 2; The frequency is controlled by the frequency control unit 3 for determining the control frequency fc of the suitable elevator drive motor and the control frequency fc determined by the frequency control unit 3. And a frequency converter (5) and a motor driving circuit (6, 7, 8) for driving the elevator drive motor (9) at a frequency determined by the frequency change section (5) to ring.

Therefore, the present invention reduces the control frequency (fc) of the three-phase induction motor for driving the elevator to 1/2 at night to automatically reduce the operating speed of the elevator by 1/2, the noise generated by the high speed operation of the elevator This reduces the noise pollution of residents.

Description

Late Night Noise Reduction System of Elevator

The present invention relates to a system and method for reducing noise generated by a high speed elevator running at high speed, and in particular, to control the control frequency of a three-phase induction motor for driving an elevator to reduce the noise generated at night when the surroundings are quiet. The present invention relates to a system and method capable of decelerating an elevator by reducing it by half.

As the modern society enters the building, the buildings are getting higher and higher, so the elevators installed in these high-rise buildings are accelerating their speed so as to be suitable for high-rise buildings.

As a result, the operation of the elevator is accelerated and the basic operation noise is increased, causing damage to passengers and the people around them. Especially, the noise caused by the high speed operation of the elevator at night when the elevator is used less often and the surroundings feel quieter This causes noise pollution to people living in buildings.

However, in the conventional elevator operating system, as shown by the flowchart shown in FIG. 1, when an elevator call signal is generated in a platform or a lift, the elevator stops at a constant speed regardless of day or night. In order to speed up, to reach a certain speed through the accelerated driving to maintain a high speed and to maintain the speed, the speed of the elevator to reach the desired floor to reduce the speed to stop at the call generation floor.

Therefore, the conventional elevator driving system is operated at the same high speed as the high-speed driving speed which is predetermined and the driving frequency is high or the night is low. Due to this, there is no problem during the day, but there is a problem that the noise generated by the high speed driving of the elevator is transmitted to the building at night time when the surroundings are quiet, resulting in noise pollution.

Therefore, the present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to distinguish between day time and night time to operate the elevator during the day and the speed of the elevator in the night time 2-3 It is to provide a system and method that can reduce the noise generated at night by doubling.

In order to achieve the above object, the present invention provides a driving time determining unit (2) for determining a night driving time zone and a weekly driving time zone according to a set driving time, and an operation speed of an elevator during an acceleration driving week, a high speed driving week, and a deceleration driving week. Divided by the central processing unit (CPU) (1) and the command frequency (fo) of the central processing unit (CPU) (1) indicating the command frequency (fo) of the elevator drive motor corresponding to the corresponding driving week and A frequency control unit 3 for determining a control frequency fc of an elevator driving motor suitable for the operation time determination signal of the travel time determination unit 2, and a control frequency fc determined by the frequency control unit 3; And a motor converter circuit 6, 7, 8 for driving the elevator drive motor 9 at a frequency determined by the frequency converter 5 for converting the furnace frequency.

The frequency controller 3 is configured to set the command frequency fo from the CPU 1 at least two natural numbers n when a determination signal indicating a night time zone is applied from the travel time determiner 2. The control frequency (fc = fo / n) corresponding to the value divided by is determined.

The motor driving circuits 6, 7, and 8 are converter circuits 8 for three-phase full-wave rectification of the three-phase alternating current power supply, and a three-phase induction motor for driving an elevator using direct current power rectified by the converter circuit 8. The power transistor base of the inverter circuit 7 is driven in accordance with the inverter circuit 7 for converting to a three-phase AC power source suitable for the rating of (9) and the control frequency fc from the frequency converter 5. The base driving circuit 6 is included.

In addition, the night noise reduction method of an elevator according to another aspect of the present invention is divided into 24 hours a day time zone and daytime operation time zone and the operation to determine whether the moment when the call signal of the elevator corresponds to any of the time zones A frequency converting step of converting the command frequency fo from the CPU 1 into 1/2 when the time determining step and the operation time range determined in the determining step are determined to be a night running time, and the frequency A first calculation step of calculating a rotational speed of the three-phase induction motor for driving an elevator according to the control frequency (fc = fo / 2) converted in the conversion step, and corresponding to the rotational speed of the motor calculated in the first operation step; And a driving step of driving the elevator according to the driving speed calculated in the second operation step and calculating a driving speed of the elevator.

1 shows an operational flowchart of a drive system for a conventional elevator.

Figure 2 shows the configuration of an embodiment of the late night noise reduction system of the elevator according to the present invention.

Figure 3 shows an operational flowchart of the late night noise reduction system of the elevator according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: central processing unit (CPU) 2: running time determination unit

3: frequency controller 4: voltage converter

5: frequency converter 6: base driving circuit

7: inverter circuit 8: converter circuit

9: elevator driving motor 10: sheave

11: lift 12: counterweight

Hereinafter, the configuration and operation of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, Figure 2 shows the configuration of an embodiment of the late-night noise reduction system of the elevator according to the present invention, Figure 3 shows an operational flowchart of the late-night noise reduction system of the elevator according to the present invention.

First, with reference to the accompanying drawings Figure 2 will be described the configuration of an embodiment for a night noise reduction system of an elevator.

The configuration of this embodiment is largely divided into a central processing unit (CPU) 1, a running time determination unit 2, a frequency control unit 3, a frequency converter 5, a voltage converter 4 and a base drive circuit. Furnace 6. As the peripheral device of the present embodiment, the converter circuit 8, the inverter circuit 7, the three-phase induction motor 9, and the elevator 11 for supplying three-phase AC power for driving the elevator driving motor 9 are driven. In particular, the drive device is composed of a sheave 10, the balance weight 12 and the elevator (11).

The central processing unit (CPU) (1) not only controls the elevator to the destination floor in accordance with the driving direction in accordance with the call of the platform or the call of the elevator, but also for the operation of the elevator, such as the speed of the elevator, opening and closing of the elevator door. It is a control device that controls overall related matters. However, in the present embodiment, the CPU 1 transmits a command frequency fo for controlling the speed of the electric motor to the frequency controller 3 according to the acceleration, high speed, and deceleration driving weeks of the elevator. It is characterized in that it has a function of applying a control signal for converting the base driving voltage to the voltage converting section 4 so as to be suitable for the driving week.

The driving time determination unit 2 is composed of a timer. The driving time determination unit 2 is a means for dividing the signal into the frequency control unit 3 in the night driving time zone by dividing the 24 hours a day into the main driving time zone and the night driving time zone. In particular, the running time determination unit 2 is designed to adjust the running time zone arbitrarily. Therefore, it is possible to adjust the night time zone from 9 pm the previous day to 5 am the next day from 10 pm the previous day to 6 am the next day.

The frequency control unit 3 receives a command frequency fo from the CPU 1 and, when the operation time determination signal from the operation time determination unit 2 is a daytime signal, the frequency. A control frequency fc equal to the command frequency fo is applied to the converting unit 5 (fo = fc), and when the running time determination signal is a night signal, the command frequency fo is applied to the frequency converting unit 5. ) Is applied with a control frequency (fc = fo / n) having the value divided by the natural number n (2≤n≤5). More preferably, n is 2. That is, if the n is too large, the control frequency fc is too small to reduce the operating speed of the elevator, which may cause boring to the riders. When n is less than 2, the control frequency fc is commanded. It is equal to the frequency (fo), so no noise reduction effect can be expected.

The frequency converter 5 is a means for converting the frequency appropriately in accordance with the control frequency fc determined by the frequency controller 3.

The base driving circuit 6 controls the base terminal of the power transistor constituting the inverter circuit 7 according to the voltage and frequency converted and applied by the voltage converter 4 and the frequency converter 5. Means.

In addition, the converter circuit 8 is composed of six rectifier diodes to generate a DC power by full-wave rectification of a three-phase AC power applied from an AC power source (not shown).

The inverter circuit 7 is composed of six power transistors or Insulated Gate Bipolar Transistors (IGBTs), and the DC power applied from the converter circuit 8 is suitable for the rating of the three-phase induction motor 9 for driving the elevator. It has a function of converting into a three-phase AC power source.

The elevator drive device described above is provided in all the conventional elevators and has the same structure and function in this embodiment. Therefore, the description of the structure and operation thereof will be omitted.

Looking at the operation of the late-night noise reduction system of the present embodiment having the structure as described above centering on the night operation time, the passenger presses the boarding button to board the elevator at the night operation time set in the operation time determination unit (2) The call signal is transmitted to the central processing unit (CPU) 1 embedded in the elevator control panel.

The central processing unit (CPU) 1 receiving the call signal instructs the frequency control section 3 of the acceleration driving command frequency fo ₁ for accelerating the stationary electric motor 9 in order to reach the constant speed of the elevator. Meanwhile, the driving time determination unit 2 receives a call signal from the CPU 1 and applies a determination signal (night driving time determination signal) corresponding to the corresponding driving time to the frequency controller 3. do.

Thus, the frequency control section 3 is divided by the acceleration traveling reference frequency (fo ₁₎ from a central processing unit (CPU) (1) to 2 (fo _1/2) to control the frequency (fc = fo _1/2 Decide on) The control frequency fc determined as described above is applied to the frequency driving unit 5 and the frequency driving unit 5 is applied to the base driving circuit 6 together with the voltage converted by the voltage converting unit 4. Rotates the electric motor 9 by controlling the base terminal of the power transistor of the inverter circuit 7.

By determining the control frequency fc, the rotation speed of the three-phase induction motor is determined by the following equation.

N = [120 × fc] / P (1)

In Equation (1), N represents the rotational speed (rpm) of the motor, P represents the number of poles of the motor, and fc represents the control frequency (Hz) of the motor.

In addition, if the rotational speed of the three-phase induction motor is obtained, the operating speed of the elevator can be obtained by the following equation.

V = [∏ × D × N] / [I × R] (2)

In Equation (2), V is the speed of the elevator (m / min), I is the gear ratio of the reducer, R is the roping factor, 원 is the circumference, D is the diameter of the sheave, N is the rotational speed of the motor. (rpm).

As can be seen from the above formulas (1) and (2), the number of poles (P) of the motor, the gear ratio (I) of the reduction gear, the roping coefficient (R), the circumference (∏), and the diameter (D) of the sheave are constant. As a result, the running speed of the elevator becomes proportional to the control frequency fc of the motor. Therefore, during the night operation of the elevator, since the control frequency fc is 1/2 of the command frequency fo, the running speed of the elevator is also reduced to 1/2 in proportion to the control frequency fc. The above description applies not only to the initial acceleration driving week, but also to the high speed driving cycle and the deceleration driving week. This can be easily seen from the flowchart of FIG. 3.

The present invention is not limited to the above-described embodiments, and various modifications and variations are made by those skilled in the art to which the present invention pertains without departing from the spirit and scope of the appended claims. Of course it is possible.

As described above, the present invention reduces the control frequency (fc) of the three-phase induction motor for driving the elevator at night and automatically reduces the operating speed of the elevator to 1/2 due to the high speed operation of the elevator. The noise generated is reduced to reduce noise pollution of residents.

Claims (6)

A driving time determination unit 2 for determining a night driving time zone and a daytime driving time zone according to the set driving time; Central processing unit (CPU) (1) which instructs the command frequency (f0) (f1) of the elevator drive conductor corresponding to the corresponding operating week by dividing the operating speed of the elevator into an acceleration driving week, a high speed driving week, and a deceleration driving week. Wow; A frequency for determining a control frequency fc (f) of a suitable elevator driving motor according to the command frequency f0 of the CPU 1 and the travel time determination signal of the travel time determination unit 2. A control unit 3; A frequency converter (5) for converting a frequency into a control frequency (fc) (f) determined by the frequency controller (3); And In an elevator midnight noise reduction system comprising motor drive circuits 6, 7, 8 for driving an elevator drive motor at a frequency determined by the frequency change unit, The frequency controller 3 receives a command frequency f0 (f1) from the central processing unit (CPU) 1 by at least two when a determination signal indicating a night time zone is applied from the travel time determination unit 2. An elevator midnight noise reduction system, characterized by determining a control frequency fc (f = f1 / n) corresponding to a value divided by a natural number n. The method of claim 1, The night noise reduction system of the elevator, characterized in that the at least two natural number n has a range of 2≤n≤5. The method of claim 2, The night noise reduction system of the elevator, characterized in that n is preferably 2. A driving time determining step of dividing the 24 hours into a daytime time zone and a nighttime time zone, and determining whether the moment when the call of the elevator occurs corresponds to any of the above time zones; A frequency converting step of converting a command frequency f0 (f1) from the CPU 1 into 1/2 when the driving time range determined in the determining step is determined to be a night running time zone; A first calculation step of calculating a rotational speed of the three-phase induction motor for driving an elevator according to the control frequency fc (f = f 1/2) converted in the frequency conversion step; A second calculation step of calculating a driving speed of an elevator corresponding to the rotation speed of the electric motor calculated in the first calculation step; And And a driving step for driving the elevator according to the driving speed calculated in the second operation step. The method of claim 4, wherein The first operation step of calculating the night noise of the elevator, characterized in that for calculating the rotation speed satisfying the following equation. N = [120 × fc] / P Here, N is the rotational speed of the motor (rpm), P is the number of poles of the motor, and fc is the control frequency (fc) (Hz) of the motor. The method of claim 4, wherein The second operation step of calculating the night noise of the elevator, characterized in that for calculating the drive speed satisfying the following equation. V = [II × D × N] / [I × R] Where V is the speed of the elevator (m / min), I is the gear ratio of the reducer, R is the roping factor, II is the circumference, D is the diameter of the sheave, N is the motor The rotation speed (rpm) is shown.

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