KR100631570B1 - Driving control method for refrigerator for capacity variable type reciprocating compressor - Google Patents

Driving control method for refrigerator for capacity variable type reciprocating compressor Download PDF

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KR100631570B1
KR100631570B1 KR1020050038139A KR20050038139A KR100631570B1 KR 100631570 B1 KR100631570 B1 KR 100631570B1 KR 1020050038139 A KR1020050038139 A KR 1020050038139A KR 20050038139 A KR20050038139 A KR 20050038139A KR 100631570 B1 KR100631570 B1 KR 100631570B1
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operating frequency
current operating
stroke
reciprocating compressor
frequency
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KR1020050038139A
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Korean (ko)
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성지원
이철웅
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엘지전자 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0206—Length of piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0401—Current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0402—Voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/01—Load in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/04—Settings
    • F04B2207/045—Settings of the resonant frequency of the unit motor-pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/04—Settings
    • F04B2207/046—Settings of length of piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/14—Refrigerants with particular properties, e.g. HFC-134a

Abstract

An operation control method of a variable capacity reciprocating compressor is provided to improve operation efficiency by performing TDC control with an inverter and varying operation frequency for following a resonant point in fluctuating natural frequency according to load. Input voltage or stroke is increased, and present input voltage or stroke is maintained if stroke reaches the top dead center predetermined by a user. A variable capacity reciprocating compressor is controlled by comparing the present operation frequency with a resonant point and adjusting operation frequency based on the decision result. The present operation frequency is maintained in integrating the present operation frequency with the resonant point, and the operation frequency is adjusted according to access of the present operation frequency to the resonant point in not integrating the present operation frequency with the resonant point.

Description

용량 가변형 왕복동식 압축기의 운전제어방법{DRIVING CONTROL METHOD FOR REFRIGERATOR FOR CAPACITY VARIABLE TYPE RECIPROCATING COMPRESSOR}DRIVING CONTROL METHOD FOR REFRIGERATOR FOR CAPACITY VARIABLE TYPE RECIPROCATING COMPRESSOR}

도1은 종래 왕복동식 압축기의 운전제어장치에 대한 구성을 보인 블록도.1 is a block diagram showing a configuration for a driving control apparatus of a conventional reciprocating compressor.

도2는 도1에 있어서, 스트로크 제어를 보인 동작흐름도.Fig. 2 is a flow chart showing stroke control in Fig. 1;

도3은 종래 용량 가변형 왕복동식 압축기의 운전제어방법을 보인 동작흐름도.Figure 3 is a flow chart showing the operation control method of a conventional variable displacement reciprocating compressor.

도4는 본 발명 용량 가변형 왕복동식 압축기의 운전제어방법을 보인 동작흐름도.Figure 4 is a flow chart showing the operation control method of the variable displacement reciprocating compressor of the present invention.

본 발명은 용량 가변형 왕복동식 압축기의 운전제어방법에 관한 것으로, 특히 인버터를 채용하여 TDC제어를 수행하면서, 부하에 따라 시스템의 고유주파수가 변동되면 그에 맞는 공진점을 추종하도록 운전주파수를 가변시킴으로써, 운전효율을 향상시키도록 한 용량가변형 왕복동식 압축기의 운전제어방법에 관한 것이다.The present invention relates to an operation control method of a variable displacement reciprocating compressor, in particular, by performing an inverter to perform the TDC control, by varying the operation frequency to follow the resonance point when the natural frequency of the system changes according to the load, driving The present invention relates to an operation control method of a variable displacement reciprocating compressor for improving efficiency.

일반적으로, 왕복동식 압축기(Reciprocating Compressor)는 피스톤이 실린더의 내부에서 선형으로 왕복운동을 하면서 냉매가스를 흡입 압축하여 토출하는 것으 로, 보다 구체적으로는 피스톤을 구동하는 방식에 따라 레시프로(Recipro) 방식과 리니어(Linear) 방식으로 구분할 수 있다.In general, a reciprocating compressor (Reciprocating Compressor) is a piston reciprocating linearly in the interior of the cylinder to suck and compress the refrigerant gas discharged, more specifically, according to the method of driving the piston (Recipro) It can be divided into a linear method and a linear method.

레시프로(Recipro) 방식은 회전모터에 크랭크 샤프트를 결합하고 이 크랭크 샤프트에 피스톤을 결합하여 회전모터의 회전력을 직선 왕복운동으로 전환하는 방식인데 반하여, 리니어(Linear) 방식은 직선모터의 가동자에 피스톤을 직접 연결하여 모터의 직선운동으로 피스톤을 왕복운동시키는 방식이다.Recipro method combines the crankshaft with the rotary motor and piston with the crankshaft to convert the rotational force of the rotary motor into linear reciprocating motion, whereas the linear method is applied to the actuator of the linear motor. Directly connecting the piston to reciprocate the piston by the linear motion of the motor.

본 발명은 리니어(Linear) 방식을 적용한 왕복동식 압축기에 관한 것이다.The present invention relates to a reciprocating compressor applying a linear system.

이러한 리니어(Linear) 방식의 왕복동식 압축기는 전술한 바와 같이 회전 운동을 직선 운동으로 변환하는 크랭크 샤프트(Crankshaft)가 없어 마찰 손실이 적으므로, 압축 효율면에서 일반 압축기 보다 압축 효율이 높다.As described above, the linear reciprocating compressor does not have a crankshaft for converting rotational motion into linear motion and thus has low frictional loss, and thus, the compression efficiency is higher than that of a general compressor.

상기 왕복동식 압축기가 냉장고나 에어컨에 사용될 경우에, 상기 왕복동식 압축기에 입력되는 전압(Voltage)을 가변 시킴에 따라 상기 왕복동식 압축기의 압축비(compression ratio)를 가변 할 수 있어 냉력(Freezing Capacity)을 제어할 수 있다.When the reciprocating compressor is used in a refrigerator or an air conditioner, the compression ratio of the reciprocating compressor can be varied by varying the voltage input to the reciprocating compressor, thereby reducing the freezing capacity. Can be controlled.

도1은 종래 왕복동식 압축기의 운전제어장치에 대한 구성을 보인 블록도로서, 이에 도시된 바와같이 모터에 인가되는 모터전류를 검출하는 전류검출부(4)와; 모터에 인가되는 모터 전압을 검출하는 전압검출부(3)와; 상기 검출된 모터 전류와 모터 전압 및 모터 파라미터에 의해, 스트로크를 추정하는 스트로크 추정기(5)와; 상기 스트로크 추정치와 스트로크 지령치를 비교하여 그에 따른 차이신호를 출력하는 비교기(1)와; 상기 차이신호에 따라, 모터에 인가되는 전압을 가변하여 스트로 크를 제어하는 제어기(2)로 구성되며, 이와같은 종래 장치의 동작을 설명한다.1 is a block diagram showing a configuration of an operation control apparatus of a conventional reciprocating compressor, and as shown therein, a current detection unit 4 for detecting a motor current applied to a motor; A voltage detector (3) for detecting a motor voltage applied to the motor; A stroke estimator (5) for estimating a stroke based on the detected motor current, motor voltage and motor parameters; A comparator (1) for comparing the stroke estimate value with the stroke command value and outputting a difference signal accordingly; In accordance with the difference signal, the controller 2 is configured to control the stroke by varying the voltage applied to the motor, and the operation of the conventional apparatus will be described.

먼저, 전류검출부(4)는 모터에 인가되는 모터전류를 검출하고, 전압검출부 (3)는 모터에 인가되는 모터전압을 검출한다.First, the current detector 4 detects a motor current applied to the motor, and the voltage detector 3 detects a motor voltage applied to the motor.

이때, 스트로크 추정기(5)는, 상기 모터전류와 모터전압 및 모터 파라미터를 하기의 수학식에 적용하여 스트로크추정치를 연산한후, 그 스트로크 추정치를 비교기(1)에 인가한다.At this time, the stroke estimator 5 applies the motor current, the motor voltage, and the motor parameter to the following equation to calculate a stroke estimate, and then applies the stroke estimate to the comparator 1.

[수학식][Equation]

Figure 112005023976848-pat00001
Figure 112005023976848-pat00001

이에 따라, 상기 비교기(1)는 상기 스토로크 추정치와 상기 스트로크 지령치를 비교하여 그에 따른 차이신호를 제어기(2)에 인가하고, 이에 의해 상기 제어기(2)는 모터에 인가되는 전압을 가변하여 스트로크를 제어한다. Accordingly, the comparator 1 compares the stroke estimate and the stroke command value and applies a difference signal to the controller 2 according to which the controller 2 varies the voltage applied to the motor to make a stroke. To control.

즉, 상기 제어기(2)는, 도2에서 보는 바와같이, 스트로크 추정치가 스트로크 지령치보다 크면 모터 인가전압을 감소시키고, 스트로크 추정치가 스트로크 지령치보다 작으면 모터 인가전압을 증가시킨다.That is, as shown in Fig. 2, the controller 2 decreases the motor applied voltage when the stroke estimate is larger than the stroke command value, and increases the motor applied voltage when the stroke estimate is smaller than the stroke command value.

여기서, 도3은 용량 가변형 왕복동식 압축기의 운전제어방법을 보인 동작흐름도이다. 3 is a flowchart illustrating an operation control method of a variable displacement reciprocating compressor.

즉, 초기에 입력전압 또는 피스톤의 스트로크를 증가시켜, 원하는 TDC에 도달하면 상기 입력전압 또는 스트로크를 유지시키고, 원하는 TDC보다 크면 입력전압 또는 스트로크를 감소시키며, 원하는 TDC보다 작으면 입력전압 또는 스트로크를 증 가시킨다.That is, initially increasing the input voltage or the stroke of the piston, and maintains the input voltage or stroke when the desired TDC is reached, and decreases the input voltage or stroke if it is larger than the desired TDC, and decreases the input voltage or stroke if it is smaller than the desired TDC. Increase.

다시 말해서,풀스트로크로 운전하는 경우에, TDC=0인 지점을, 스트로크와 전류의 위상차의 변곡점으로부터 검출하여, 모든 부하에서 동일한 운전주파수로 TDC 운전제어를 실시한다.In other words, when operating at full stroke, the point where TDC = 0 is detected from the inflection point of the phase difference between the stroke and the current, and TDC operation control is performed at the same operating frequency at all loads.

상술한 종래 용량 가변형 왕복동식 압축기의 운전제어방법은, 저부하 영역에서 일정주파수 운전시, 시스템 고유 주파수가 공진점을 벗어나게 되는데, 즉 시스템 고유 주파수가 운전주파수보다 작게 되어 실제 부하는 작으나 고냉력을 발생하게 되므로 운전효율이 저하되는 문제점이 있다.In the above-described operation control method of the variable displacement reciprocating compressor, when the constant frequency operation in the low load region, the system natural frequency is out of the resonance point, that is, the system natural frequency is smaller than the operating frequency, the actual load is small but generates high cooling power Since there is a problem that the operating efficiency is reduced.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, 인버터를 채용하여 TDC제어를 수행하면서, 부하에 따라 시스템의 고유주파수가 변동되면 그에 맞는 공진점을 추종하도록 운전주파수를 가변시킴으로써, 운전효율을 향상시키도록 한 용량가변형 왕복동식 압축기의 운전제어방법을 제공함에 그 목적이 있다. The present invention has been made to solve the above problems, and while operating the TDC control employing an inverter, if the natural frequency of the system changes depending on the load, by varying the operating frequency to follow the resonance point according to the load, operating efficiency is improved It is an object of the present invention to provide an operation control method for a variable displacement reciprocating compressor.

상기와 같은 목적을 달성하기 위한 본 발명은, 운전주파수 가변이 가능한 왕복동식 압축기에 있어서,The present invention for achieving the above object, in the reciprocating compressor having a variable operating frequency,

입력전압 또는 스트로크를 증가시키는 과정과;Increasing the input voltage or stroke;

사용자가 기설정한 TDC에 스트로크가 도달하면 현재 입력전압 또는 스트로크를 그대로 유지하는 과정과;Maintaining a current input voltage or stroke when the stroke reaches the TDC preset by the user;

현재 운전주파수가 공진점과 일치하는지를 판단하고, 그 판단결과에 근거하 여 운전주파수를 가감하는 과정을 수행함을 특징으로 한다.It is characterized by determining whether the current operating frequency coincides with the resonance point and performing or subtracting the operating frequency based on the determination result.

이하, 본 발명에 의한 용량 가변형 왕복동식 압축기의 운전제어방법에 대한 작용과 효과를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, the operation and effect of the operation control method of the variable displacement reciprocating compressor according to the present invention will be described in detail with reference to the accompanying drawings.

본 발명 용량 가변형 왕복동식 압축기의 운전제어방법이 적용되는 장치는, 도1과 동일하며, 다만 운전주파수를 가변시키기 위한 인버터가 더 포함되는 것이 다르다.The apparatus to which the operation control method of the variable displacement reciprocating compressor of the present invention is applied is the same as that of FIG. 1 except that an inverter for varying the operating frequency is further included.

도4는 본 발명 용량 가변형 왕복동식 압축기의 운전제어방법에 대한 실시예의 동작흐름도이다.4 is an operation flowchart of an embodiment of the operation control method of the variable displacement reciprocating compressor of the present invention.

도4에 도시한 바와같이 본 발명은, 입력전압 또는 스트로크를 증가시키는 과정과; 사용자가 기설정한 TDC에 스트로크가 도달하면 현재 입력전압 또는 스트로크를 그대로 유지하는 과정과; 현재 운전주파수가 공진점과 일치하는지를 판단하는 과정과; 상기 판단결과, 현재 운전주파수가 공진점과 일치하면 현재 운전주파수를 그대로 유지하고, 현재 운전주파수가 공진점과 일치하지 않으면 현재 운전주파수가 공진점에 접근중인지의 여부에 따라 운전주파수를 가감하는 과정으로 이루어지며, 이와 같은 본 발명의 동작을 설명한다.As shown in Fig. 4, the present invention provides a method for increasing an input voltage or a stroke; Maintaining a current input voltage or a stroke as long as the stroke reaches the TDC preset by the user; Determining whether the current operating frequency coincides with the resonance point; As a result of the determination, if the current operating frequency coincides with the resonance point, the current operating frequency is maintained as it is, and if the current operating frequency does not coincide with the resonance point, the operation frequency is added or subtracted according to whether the current operating frequency is approaching the resonance point. This operation of the present invention will be described.

먼저, 압축기가 기동되면, 입력전압 또는 스트로크를 서서히 증가시키면서, 사용자가 기설정한 TDC에 도달하는지를 판단한다.First, when the compressor is started, it is determined whether the user reaches the preset TDC while gradually increasing the input voltage or stroke.

상기 판단결과, 현재 피스톤의 위치가 TDC에 도달하지 않으면, 그 피스톤의 위치가 TDC를 초과하였는지를 판단하여, 피스톤의 위치가 TDC를 초과하면 입력전압 또는 스트로크를 감소시키고, 피스톤의 위치가 TDC에 미달하면 입력전압 또는 스트 로크를 증가시킨다.As a result of the determination, if the current position of the piston does not reach the TDC, it is determined whether the position of the piston has exceeded the TDC, and if the position of the piston exceeds the TDC, the input voltage or stroke is reduced, and the position of the piston falls short of the TDC. Increase the input voltage or the stroke.

상기 판단결과, 현재 피스톤의 위치가 TDC에 도달하면 현재 입력전압 또는 스트로크를 그대로 유지시키면서 공진점 체크모드로 진입하는데, 상기 공진점 체크 모드를 상세히 설명한다.As a result of the determination, when the current position of the piston reaches the TDC, the resonance point check mode is entered while maintaining the current input voltage or the stroke as it is. The resonance point check mode will be described in detail.

우선, 현재 운전주파수가 공진점과 일치하는지를 판단하고, 그 판단결과에 근거하여 운전주파수를 가감하는데, 즉 현재 운전주파수가 공진점과 일치하면 현재 운전주파수를 그대로 유지하고, 현재 운전주파수가 공진점과 일치하지 않으면 현재 운전주파수가 공진점에 접근중인지의 여부에 따라 운전주파수를 가감한다.First, it is determined whether the current operating frequency coincides with the resonance point, and the operating frequency is added or subtracted based on the determination result, that is, if the current operating frequency coincides with the resonance point, the current operating frequency is kept as it is, and the current operating frequency does not coincide with the resonance point. If not, the operating frequency is added or subtracted depending on whether the current operating frequency is approaching the resonance point.

예를 들어, 현재 운전주파수가 공진점에 접근중이면, 현재 운전주파수가 증가중인지를 판단하고, 그 판단결과 현재 운전주파수가 증가중이면 현재 운전주파수를 증가시키고, 현재 운전주파수가 증가중이 아니면 현재 운전주파수를 감소시킨다.For example, if the current operating frequency is approaching the resonance point, it is determined whether the current operating frequency is increasing, and as a result of the determination, if the current operating frequency is increasing, the current operating frequency is increased, and if the current operating frequency is not increasing, Reduce operating frequency

만약, 현재 운전주파수가 공진점에 접근중이 아니면, 현재 운전주파수가 증가중인지를 판단하고, 그 판단결과 현재 운전주파수가 증가중이면, 현재 운전주파수를 감소시키고, 현재 운전주파수가 증가중이 아니면 현재 운전주파수를 증가시킨다.If the current operating frequency is not approaching the resonance point, it is determined whether the current operating frequency is increasing. If the current operating frequency is increasing as a result of the determination, the current operating frequency is decreased, and if the current operating frequency is not increasing, Increase the operating frequency.

즉, 종래에는 저부하영역에서 일정 주파수 운전시, 시스템 고유주파수를 벗어나 실제부하는 작으나 고냉력을 발생하여 효율이 저하되는 문제점이 있는 반면에, 본 발명은 인버터를 사용하여 운전주파수를 공진점을 추종하도록 제어함으로써, 운전효율을 향상시키도록 한 것이다.That is, in the prior art, when a constant frequency operation is performed in a low load region, the actual load is smaller than the system natural frequency but a high cooling force is generated, resulting in a decrease in efficiency, while the present invention uses an inverter to follow the resonance point of the operating frequency. The control is to improve the driving efficiency.

상기 본 발명의 상세한 설명에서 행해진 구체적인 실시 양태 또는 실시예는 어디까지나 본 발명의 기술 내용을 명확하게 하기 위한 것으로 이러한 구체적 실시예에 한정해서 협의로 해석해서는 안되며, 본 발명의 정신과 다음에 기재된 특허 청구의 범위내에서 여러가지 변경 실시가 가능한 것이다.Specific embodiments or examples made in the detailed description of the present invention are intended to clarify the technical contents of the present invention to the extent that they should not be construed as limited to these specific embodiments and should not be construed in consultation. Various changes can be made within the scope of.

이상에서 상세히 설명한 바와같이 본 발명은, 인버터를 채용하여 TDC제어를 수행하면서, 부하에 따라 시스템의 고유주파수가 변동되면 그에 맞는 공진점을 추종하도록 운전주파수를 가변시킴으로써, 운전효율을 향상시키는 우수한 효과가 있다. As described in detail above, the present invention, while performing the TDC control by using an inverter, by varying the operating frequency to follow the resonance point when the natural frequency of the system changes according to the load, there is an excellent effect of improving the operating efficiency have.

Claims (6)

운전주파수 가변이 가능한 왕복동식 압축기에 있어서,In the reciprocating compressor having a variable operating frequency, 입력전압 또는 스트로크를 증가시키는 과정과;Increasing the input voltage or stroke; 사용자가 기설정한 TDC에 스트로크가 도달하면 현재 입력전압 또는 스트로크를 그대로 유지하는 과정과;Maintaining a current input voltage or a stroke as long as the stroke reaches the TDC preset by the user; 현재 운전주파수가 공진점과 일치하는지를 판단하고, 그 판단결과에 근거하여 운전주파수를 가감하는 과정을 수행함을 특징으로 하는 용량가변형 왕복동식 압축기의 운전제어방법.Determining whether the current operating frequency coincides with the resonance point, and performing or subtracting the operating frequency based on the determination result. 제1 항에 있어서, 운전주파수를 가감하는 과정은,The method of claim 1, wherein the step of adding or subtracting the driving frequency is performed. 현재 운전주파수가 공진점과 일치하면 현재 운전주파수를 그대로 유지하는 단계와;If the current operating frequency coincides with the resonance point, maintaining the current operating frequency as it is; 현재 운전주파수가 공진점과 일치하지 않으면 현재 운전주파수가 공진점에 접근중인지의 여부에 따라 운전주파수를 가감하는 단계를 포함하는 것을 특징으로 하는 용량가변형 왕복동식 압축기의 운전제어방법.And if the current operating frequency does not coincide with the resonance point, adding or subtracting the operating frequency according to whether the current operating frequency is approaching the resonance point. 제2 항에 있어서, 운전주파수를 가감하는 단계는,The method of claim 2, wherein the step of adding or subtracting the operating frequency, 현재 운전주파수가 공진점에 접근중이면, 현재 운전주파수가 증가중인지의 여부에 따라 주파수를 가감하는 단계를 포함하는 것을 특징으로 하는 용량가변형 왕복동식 압축기의 운전제어방법.If the current operating frequency is approaching the resonance point, the operation control method for a variable displacement reciprocating compressor comprising the step of adding or subtracting the frequency according to whether or not the current operating frequency is increasing. 제3 항에 있어서, 운전주파수를 가감하는 단계는,The method of claim 3, wherein the step of adding or subtracting the operating frequency, 현재 운전주파수가 증가중이면 현재 운전주파수를 증가시키고, 현재 운전주파수가 증가중이 아니면 현재 운전주파수를 감소시키는 단계를 포함하는 것을 특징으로 하는 용량가변형 왕복동식 압축기의 운전제어방법.And increasing the current operating frequency if the current operating frequency is increasing, and decreasing the current operating frequency if the current operating frequency is not increasing. 제2 항에 있어서, 운전주파수를 가감하는 단계는,The method of claim 2, wherein the step of adding or subtracting the operating frequency, 현재 운전주파수가 공진점에 접근중이 아니면, 현재 운전주파수 증가중인지의 여부에 따라 주파수를 가감하는 단계를 포함하는 것을 특징으로 하는 용량가변형 왕복동식 압축기의 운전제어방법.If the current operating frequency is not approaching the resonance point, the operation control method for a variable displacement reciprocating compressor comprising the step of adding or subtracting the frequency depending on whether the current operating frequency is increasing. 제5 항에 있어서, 주파수를 가감하는 단계는,The method of claim 5, wherein the step of adding or subtracting frequency, 현재 운전주파수가 증가중이면, 현재 운전주파수를 감소시키고, 현재 운전주파수가 증가중이 아니면 현재 운전주파수를 증가시키는 단계를 포함하는 것을 특징으로 하는 용량가변형 왕복동식 압축기의 운전제어방법.And if the current operating frequency is increasing, reducing the current operating frequency, and if the current operating frequency is not increasing, increasing the current operating frequency.
KR1020050038139A 2005-05-06 2005-05-06 Driving control method for refrigerator for capacity variable type reciprocating compressor KR100631570B1 (en)

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