JPH04281144A - Refrigerating plant - Google Patents
Refrigerating plantInfo
- Publication number
- JPH04281144A JPH04281144A JP3041788A JP4178891A JPH04281144A JP H04281144 A JPH04281144 A JP H04281144A JP 3041788 A JP3041788 A JP 3041788A JP 4178891 A JP4178891 A JP 4178891A JP H04281144 A JPH04281144 A JP H04281144A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- voltage
- compressor
- control
- variable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003507 refrigerant Substances 0.000 claims abstract description 17
- 238000005057 refrigeration Methods 0.000 claims description 27
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 238000013459 approach Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract 1
- 230000001934 delay Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
Landscapes
- Air Conditioning Control Device (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、圧縮機の電動機への
電圧および周波数を制御する制御器を備えた冷凍装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system equipped with a controller for controlling voltage and frequency applied to a motor of a compressor.
【０００２】0002
【従来の技術】冷凍装置の従来技術としては、実公平２
−２８３５３号公報に記載されたものがある。[Prior Art] As a conventional technology of refrigeration equipment, there is a
There is one described in Japanese Patent No.-28353.
【０００３】この冷凍装置には、圧縮機と凝縮器と減圧
器とを冷媒管で接続した冷媒回路と、圧縮機の駆動用電
動機に供給する電圧および周波数を制御する制御器とを
備えたものである。[0003] This refrigeration system includes a refrigerant circuit in which a compressor, a condenser, and a pressure reducer are connected by a refrigerant pipe, and a controller that controls the voltage and frequency supplied to the motor for driving the compressor. It is.
【０００４】0004
【発明が解決しようとする課題】前述した冷凍装置では
、圧縮機の駆動用電動機への電圧／周波数の値を一定値
とする一定制御モードにおいても、前記値を負荷に応じ
て可変する可変制御モードにおいても、周波数の可変速
度が同じであった。[Problems to be Solved by the Invention] In the above-mentioned refrigeration system, even in the constant control mode in which the voltage/frequency value to the motor for driving the compressor is set to a constant value, variable control is performed in which the value is varied according to the load. The speed at which the frequency was varied was the same in both modes.
【０００５】このような冷凍装置の制御では、周波数の
可変速度が速いため目標周波数には比較的速い時間で到
達するものの、制御目標とする電圧−周波数の特性から
はかなり外れた制御となる〔図４の一点鎖線参照〕ため
、制御目標とする電圧に近づけられず、電圧をきめ細か
く負荷にマッチングさせることができなかった。[0005] In the control of such a refrigeration system, although the target frequency is reached in a relatively quick time because the frequency is varied quickly, the control results in a control that deviates considerably from the voltage-frequency characteristic that is the control target. [see the dashed line in FIG. 4], it was not possible to approach the control target voltage, and it was not possible to finely match the voltage to the load.
【０００６】この発明は、制御目標とする電圧−周波数
の特性に近づけた制御を行なえる冷凍装置を提供するも
のである。[0006] The present invention provides a refrigeration system that can perform control close to voltage-frequency characteristics targeted for control.
【０００７】[0007]
【課題を解決するための手段】この発明は、圧縮機と凝
縮器と減圧器と蒸発器とを冷媒管で接続した冷媒回路と
、圧縮機の駆動用電動機に供給する電源の周波数および
電圧を制御するインバータ部を有する制御器とを備えた
冷凍装置において、前記制御器には、電圧／周波数の値
を負荷に応じて可変する可変制御モードでは前記値を一
定値とする一定制御モードと比較して周波数の可変速度
を遅くするための制御手段を設けたものである。[Means for Solving the Problems] The present invention provides a refrigerant circuit in which a compressor, a condenser, a pressure reducer, and an evaporator are connected by refrigerant pipes, and a frequency and voltage of a power supply that is supplied to a drive motor of the compressor. In the refrigeration system, the controller includes a variable control mode in which the voltage/frequency value is varied according to the load, compared with a constant control mode in which the value is set to a constant value. A control means is provided for slowing down the speed at which the frequency is varied.
【０００８】[0008]
【作用】この冷凍装置では、制御器の制御手段により可
変制御モードでは一定制御モードと比較して周波数の可
変速度を遅くするので、この周波数の可変速度が遅い分
だけ余分に電圧が制御され、制御する電圧が目標周波数
に対する電圧に沿うようになめらかに近づく。[Operation] In this refrigeration system, the control means of the controller slows down the frequency variable speed in the variable control mode compared to the constant control mode, so the voltage is controlled extra by the slow frequency variable speed. The controlled voltage smoothly approaches the voltage for the target frequency.
【０００９】[0009]
【実施例】この発明の実施例を図面に基づいて説明する
。[Embodiment] An embodiment of the present invention will be explained based on the drawings.
【００１０】図１において、１は分離型空気調和機等の
冷凍装置で室内ユニットＡと、室外ユニットＢと、両ユ
ニットを結ぶユニット間配管２とから構成されている。
室内ユニットＡには蒸発器３が内蔵されている。In FIG. 1, reference numeral 1 denotes a refrigeration system such as a separate air conditioner, which is composed of an indoor unit A, an outdoor unit B, and an inter-unit pipe 2 that connects the two units. The indoor unit A has a built-in evaporator 3.
【００１１】一方、室外ユニットＢにはアキュームレー
タ４と、圧縮機５と、凝縮器６と減圧器７とが内蔵され
ている。そして冷房運転時に例えば電源周波数を１５Ｈ
ｚ〜１５０Ｈｚに可変できるインバータ部１０からの入
力で圧縮機５の回転速度を変えて、冷房能力を可変させ
ることができる。ここで１５Ｈｚが圧縮機５の運転可能
な最低周波数ｆ０であり、１５０Ｈｚが圧縮機５の運転
可能な最高周波数ｆ５である。On the other hand, the outdoor unit B includes an accumulator 4, a compressor 5, a condenser 6, and a pressure reducer 7. For example, the power frequency is set to 15H during cooling operation.
The cooling capacity can be varied by changing the rotational speed of the compressor 5 using the input from the inverter unit 10 which can be varied from 100 Hz to 150 Hz. Here, 15 Hz is the lowest frequency f0 at which the compressor 5 can be operated, and 150 Hz is the highest frequency f5 at which the compressor 5 can be operated.
【００１２】尚、圧縮機５と凝縮器６と減圧器７と蒸発
器３とを冷媒管３０や配管２で接続して冷媒回路３１を
構成している。Note that a refrigerant circuit 31 is constructed by connecting the compressor 5, condenser 6, pressure reducer 7, and evaporator 3 through refrigerant pipes 30 and piping 2.
【００１３】９はインバータ主回路、１０は電動機に供
給する電源の周波数および電圧を制御するインバータ部
、１１はベース駆動回路である。Reference numeral 9 is an inverter main circuit, 10 is an inverter section that controls the frequency and voltage of the power supply supplied to the motor, and 11 is a base drive circuit.
【００１４】１２は室内ユニットＡの制御装置１３から
の周波数指令信号を入力する入力回路、１４は１チップ
のマイクロコンピュータを用いた制御手段、１５は電動
機１６のローターに取付けられたディスク、１７はこの
ディスクに取付けられた磁石を検出する磁気検出センサ
で、このセンサからの信号は入力回路８を介して前記制
御手段１４に入力される。12 is an input circuit for inputting the frequency command signal from the control device 13 of the indoor unit A, 14 is a control means using a one-chip microcomputer, 15 is a disk attached to the rotor of the electric motor 16, and 17 is a A magnetic detection sensor detects a magnet attached to this disk, and a signal from this sensor is inputted to the control means 14 via the input circuit 8.
【００１５】尚、１８は圧縮機用の制御器である。前記
制御手段１４は、圧縮機５の起動時には、インバータ部
１０に指令信号を出力して、圧縮機５と冷媒管３０とが
共振する共振周波数ｆ１［例えば１７〜１８Ｈｚ］より
高い周波数ｆ２［２０Ｈｚ］の電圧を電動機１６に印加
させるものである。Note that 18 is a controller for the compressor. When starting up the compressor 5, the control means 14 outputs a command signal to the inverter unit 10 to set a frequency f2 [20 Hz] higher than the resonance frequency f1 [for example, 17 to 18 Hz] at which the compressor 5 and the refrigerant pipes 30 resonate. ] is applied to the electric motor 16.
【００１６】また、この制御手段１４は、電圧／周波数
の値を所定時間ｔ１、例えば１００秒間は一定に保ち〔
一定制御モード〕、この後は前記値を一定〔一定制御モ
ード〕あるいは可変する〔可変制御モード〕。Further, this control means 14 keeps the voltage/frequency value constant for a predetermined time t1, for example, 100 seconds.
After that, the value is kept constant [constant control mode] or variable [variable control mode].
【００１７】そして、この制御手段１４は前記１００秒
経過後は、運転周波数が高いとき、例えば５０Ｈｚ以上
のときは電圧／周波数の値を一定制御モードのままにす
ると共に運転周波数の可変速度を１Ｈｚ／０．５秒のま
まとし、運転周波数が低いとき、例えば５０Ｈｚ未満の
ときは前記比を可変制御モードとすると共に運転周波数
の可変速度を１Ｈｚ／３秒と遅くする。After the 100 seconds have elapsed, when the operating frequency is high, for example, 50 Hz or higher, the control means 14 maintains the voltage/frequency value in the constant control mode, and also changes the variable speed of the operating frequency to 1 Hz. /0.5 seconds, and when the operating frequency is low, for example less than 50 Hz, the ratio is set to variable control mode and the variable speed of the operating frequency is slowed to 1 Hz/3 seconds.
【００１８】更にまた、前記制御手段１４は、前記値を
可変する場合は図３に示すフローチャートに従って動作
する。Furthermore, the control means 14 operates according to the flowchart shown in FIG. 3 when varying the value.
【００１９】尚、図３には、周波数を制御する動作は示
していない。前記制御手段１４は、電圧／周波数の制御
量より負荷判断を行ない、最小とする周波数ｆ４を決定
し、この最小とする周波数ｆ４以上の運転周波数で圧縮
機５の電動機１６を駆動する。Note that FIG. 3 does not show the operation of controlling the frequency. The control means 14 judges the load based on the voltage/frequency control amount, determines the minimum frequency f4, and drives the electric motor 16 of the compressor 5 at an operating frequency equal to or higher than the minimum frequency f4.
【００２０】このように構成された冷凍装置１では次に
説明するように動作する。まず最初に、制御手段１４か
らの指令信号によりインバータ部１０が共振周波数ｆ１
［１７〜１８Ｈｚ］より高い周波数ｆ２［２０Ｈｚ］で
圧縮機５の電動機１６を起動させる。The refrigeration system 1 thus constructed operates as described below. First, a command signal from the control means 14 causes the inverter section 10 to operate at the resonant frequency f1.
The electric motor 16 of the compressor 5 is started at a frequency f2 [20 Hz] higher than [17-18 Hz].
【００２１】前記周波数ｆ２は圧縮機５と冷媒管３０の
共振周波数ｆ１［１７〜１８Ｈｚ］より大きな２０Ｈｚ
であるため、電圧／周波数の値を一定に保ちながら周波
数を上昇させると、圧縮機５の運転周波数は前記共振周
波数ｆ１を通過しない。The frequency f2 is 20 Hz, which is higher than the resonance frequency f1 [17 to 18 Hz] of the compressor 5 and the refrigerant pipe 30.
Therefore, if the frequency is increased while keeping the voltage/frequency value constant, the operating frequency of the compressor 5 will not pass the resonance frequency f1.
【００２２】このため、圧縮機５と冷媒管３０とが共振
により振動することや振動に伴ない生ずる騒音を防止す
ることができる。[0022] Therefore, it is possible to prevent the compressor 5 and the refrigerant pipe 30 from vibrating due to resonance and the noise generated due to the vibration.
【００２３】また、制御手段１４は電圧／周波数の値を
一定に保っていた１００秒間の制御中は電動機１６の運
転周波数を、周波数ｆ３以上の周波数に設定することに
よって、周波数ｆ３より低い周波数で圧縮機５を運転す
ることを制限する。Furthermore, during the 100 seconds of control in which the voltage/frequency values are kept constant, the control means 14 sets the operating frequency of the electric motor 16 to a frequency higher than frequency f3, so that the operating frequency of the motor 16 is set to a frequency lower than frequency f3. Operation of the compressor 5 is restricted.
【００２４】このように、圧縮機５の運転周波数を一定
時間、周波数ｆ３以上に制御されると、凝縮器６内に冷
媒が必要量溜まり込む時間や、凝縮器６と蒸発器３との
差圧が生ずる時間もとれ、起動時における過渡的で冷媒
の不安定な状態において、圧縮機５の運転周波数を下げ
るような望ましくない制御が回避される。In this way, when the operating frequency of the compressor 5 is controlled to be higher than the frequency f3 for a certain period of time, the time required for the refrigerant to accumulate in the condenser 6 and the difference between the condenser 6 and the evaporator 3 are reduced. It takes time for the pressure to build up, and undesirable control such as lowering the operating frequency of the compressor 5 in a transient and unstable state of the refrigerant at startup is avoided.
【００２５】更にまた、この冷凍装置においては、１０
０秒が経過すると次のように動作する。Furthermore, in this refrigeration system, 10
When 0 seconds have elapsed, the following operation occurs.
【００２６】制御手段１４は電圧／周波数の値を一定に
保っていた制御〔一定制御モード〕から、前記値を一定
にする制御あるいは可変させる制御〔一定制御モードあ
るいは可変制御モード〕を行なう。The control means 14 performs control in which the voltage/frequency value is kept constant (constant control mode), and then control in which the value is kept constant or variable (constant control mode or variable control mode).
【００２７】前記制御手段１４は、運転周波数が高いと
き、例えば５０〜１５０Ｈｚのときは、一定制御モード
として運転周波数の可変速度を１Ｈｚ／０．５秒のまま
とし、運転周波数が低いとき、例えば１５〜５０Ｈｚの
ときは可変制御モードとして運転周波数の可変速度を１
Ｈｚ／３秒とする。When the operating frequency is high, for example from 50 to 150 Hz, the control means 14 maintains the variable speed of the operating frequency at 1 Hz/0.5 seconds as a constant control mode, and when the operating frequency is low, for example When the frequency is 15 to 50Hz, the variable speed of the operating frequency is set to 1 as a variable control mode.
Hz/3 seconds.
【００２８】制御手段１４が特に周波数が低いときに１
Ｈｚ／３秒と可変速度を遅くする理由は、運転周波数が
低く、例えば１５〜５０Ｈｚであれば冷凍装置の制御が
安定していると判断できるため運転周波数の可変速度を
速くする必要がなく、しかも、このような状態では制御
速度が１Ｈｚ／０．５秒のように速いと冷凍装置１にお
ける制御が追随できないからである。The control means 14 is set to 1 when the frequency is particularly low.
The reason for slowing the variable speed to Hz/3 seconds is that the operating frequency is low, for example, if it is 15 to 50 Hz, it can be determined that the control of the refrigeration system is stable, so there is no need to increase the variable speed of the operating frequency. Moreover, in such a state, if the control speed is as fast as 1 Hz/0.5 seconds, the control in the refrigeration system 1 cannot follow it.
【００２９】また、例えば１Ｈｚ／５秒等と可変速度を
もっと遅くすると冷凍装置１における制御が遅くなり過
ぎるため、制御が遅くなり過ぎないように運転周波数が
低いときは可変速度を１Ｈｚ／３秒と決めた。Furthermore, if the variable speed is made slower, such as 1 Hz/5 seconds, the control in the refrigeration system 1 will become too slow, so in order to prevent the control from becoming too slow, the variable speed should be reduced to 1 Hz/3 seconds when the operating frequency is low. I decided.
【００３０】尚、制御器１８の制御手段１４により可変
制御モードでは一定制御モードと比較して運転周波数の
可変速度が１Ｈｚ／３秒のように遅くされるので、この
周波数の可変速度の遅い分だけ余分に電圧が制御され、
制御する電圧が目標周波数に対する電圧に沿うようにな
めらかに近づく〔図４参照〕。It should be noted that in the variable control mode, the control means 14 of the controller 18 slows down the variable speed of the operating frequency to 1 Hz/3 seconds compared to the constant control mode. Only extra voltage is controlled,
The controlled voltage smoothly approaches the voltage corresponding to the target frequency (see FIG. 4).
【００３１】制御する電圧を目標周波数に対する電圧に
沿うようになめらかに近づけることができるので、これ
によりきめ細かく電圧を負荷にマッチングさせることが
でき、延いては効率の良い圧縮機５の運転を実現するこ
とができる。[0031] Since the voltage to be controlled can be smoothly brought close to the voltage for the target frequency, it is possible to finely match the voltage to the load, which in turn realizes efficient operation of the compressor 5. be able to.
【００３２】図３のＶ，Ｖ１，ΔＶは夫々実際の印加電
圧、標準印加電圧、補正印加電圧を示している。V, V1, and ΔV in FIG. 3 indicate the actual applied voltage, standard applied voltage, and corrected applied voltage, respectively.
【００３３】また、Ｎ，Ｎｆは夫々実際の電動機回転数
、目標回転数を示し、ｎ，ｎ０は夫々補正数、基準補正
数、ｆ，ｆ４は夫々実際の運転周波数、設定される最小
運転周波数を示している。Further, N and Nf indicate the actual motor rotation speed and target rotation speed, respectively, n and n0 respectively indicate the correction number and reference correction number, and f and f4 respectively indicate the actual operating frequency and the set minimum operating frequency. It shows.
【００３４】まず最初に、ステップ５０で制御手段１４
は実際の印加電圧Ｖを演算し、実際の電動機回転数Ｎを
磁気センサ１７からの信号により算出する。First, in step 50, the control means 14
calculates the actual applied voltage V and calculates the actual motor rotation speed N based on the signal from the magnetic sensor 17.
【００３５】そして、ステップ５１では実際の電動機回
転数Ｎと目標回転数Ｎｆとを比較し、電動機回転数Ｎが
目標回転数Ｎｆより大きい場合は補正数ｎにｎ−１を代
入し［ステップ５２］、電動機回転数Ｎが目標回転数Ｎ
ｆと同じ場合は補正数ｎはそのままにし［ステップ５３
］、電動機回転数Ｎが目標回転数Ｎｆより小さい場合は
補正数ｎにｎ＋１を代入する［ステップ５４］。Then, in step 51, the actual motor rotation speed N and the target rotation speed Nf are compared, and if the motor rotation speed N is larger than the target rotation speed Nf, n-1 is substituted for the correction number n [Step 52 ], the motor rotation speed N is the target rotation speed N
If it is the same as f, leave the correction number n as is [Step 53
], if the motor rotation speed N is smaller than the target rotation speed Nf, n+1 is substituted for the correction number n [step 54].
【００３６】次に、ステップ５５で不等式「補正数ｎ＞
基準補正数ｎ０」が正しいかどうか判別し、正しい場合
はステップ５６で不等式「実際の運転周波数ｆ＜設定さ
れた最小運転周波数ｆ４」が正しいかどうか判別する。Next, in step 55, the inequality "correction number n>
It is determined whether the "reference correction number n0" is correct, and if it is, it is determined in step 56 whether the inequality "actual operating frequency f<set minimum operating frequency f4" is correct.
【００３７】不等式「運転周波数ｆ＜設定された最小運
転周波数ｆ４」が正しい場合はステップ５７で運転周波
数ｆに設定された最小運転周波数ｆ４を代入し、ステッ
プ５０に戻る。If the inequality "operating frequency f<set minimum operating frequency f4" is correct, in step 57 the set minimum operating frequency f4 is substituted for the operating frequency f, and the process returns to step 50.
【００３８】尚、ステップ５５，５６での不等式が正し
くない場合は、ステップ５０に戻る。Note that if the inequalities at steps 55 and 56 are incorrect, the process returns to step 50.
【００３９】フローチャート中の補正数ｎは補正印加電
圧ΔＶに掛けられていてｎΔＶは標準印加電圧Ｖ１に対
する制御量となり、ΔＶを一定に設定しているので補正
数ｎを電圧／周波数の制御量とみなして良い。The correction number n in the flowchart is multiplied by the corrected applied voltage ΔV, and nΔV is the control amount for the standard applied voltage V1. Since ΔV is set constant, the correction number n is the voltage/frequency control amount. It's fine to consider it.
【００４０】そして、この補正数ｎが大きいとき、負荷
は大きく、補正数ｎが小さいとき、あるいはマイナスの
ときは負荷が小さい。When the correction number n is large, the load is large, and when the correction number n is small or negative, the load is small.
【００４１】従来、印加電圧／周波数の比を可変制御す
る場合、負荷に対する電流の変化率が小さいので検知精
度を考慮すると充分正確な負荷判断は望めなかった。Conventionally, when the ratio of applied voltage/frequency is variably controlled, since the rate of change of current with respect to the load is small, sufficiently accurate load judgment cannot be expected in consideration of detection accuracy.
【００４２】また、圧縮機の運転周波数が変化した場合
の過渡的な状態における負荷に対しては、外気温度を検
知して負荷判断を行なう方法でも充分正確な負荷判断が
できなかった。[0042] Furthermore, even with the method of detecting the outside air temperature and determining the load, it was not possible to make a sufficiently accurate load determination for the load in a transient state when the operating frequency of the compressor changes.
【００４３】しかし、この冷凍装置では、制御手段１４
が電圧／周波数の制御量より負荷の大きさの判断を行な
うため、従来のものに比べてより正確な判断が行なえる
。However, in this refrigeration system, the control means 14
Since the system determines the magnitude of the load rather than the voltage/frequency control amount, more accurate determination can be made than in the conventional system.
【００４４】しかも、この冷凍装置では前記負荷判断に
合わせて最小運転周波数ｆ４を決定し、この最小運転周
波数ｆ４以上の周波数で圧縮機５の電動機１６を運転す
るので、次に説明するような利点がある。Moreover, in this refrigeration system, the minimum operating frequency f4 is determined in accordance with the load judgment, and the electric motor 16 of the compressor 5 is operated at a frequency higher than this minimum operating frequency f4, so there are advantages as described below. There is.
【００４５】電圧／周波数の値を可変する制御を行なう
場合は、運転周波数を急激に低下させると、冷凍装置内
の圧力差は急激には低下せず、実際の値と理論値がずれ
ることになり、運転周波数の下げ量が大きい程このずれ
は大きくなる。When performing control to vary the voltage/frequency values, if the operating frequency is suddenly lowered, the pressure difference within the refrigeration system will not drop rapidly and the actual value will deviate from the theoretical value. The larger the amount of reduction in the operating frequency is, the larger this deviation becomes.
【００４６】前記最小運転周波数ｆ４を決め、運転周波
数をこの周波数以上にすることにより、運転周波数をあ
る周波数より下げないように制御し、実際の値と理論値
とが大きくずれることのないようにする。By determining the minimum operating frequency f4 and making the operating frequency higher than this frequency, the operating frequency is controlled so as not to fall below a certain frequency, and the actual value and the theoretical value do not deviate greatly. do.
【００４７】このような制御により、この冷凍装置１に
おいては、実際の値と理論値とのずれが小さく、冷凍能
力の過不足が非常に少なく負荷に見合った運転周波数で
圧縮機５の電動機１６を運転することができる。With such control, in this refrigeration system 1, the deviation between the actual value and the theoretical value is small, the excess or deficiency of the refrigeration capacity is very small, and the electric motor 16 of the compressor 5 is operated at an operating frequency commensurate with the load. can drive.
【００４８】[0048]
【発明の効果】以上説明したように、この発明によれば
、インバータ部を有する制御器には電圧／周波数の値を
負荷に応じて可変する可変制御モードでは前記値を一定
値とする一定制御モードと比較して周波数の可変速度を
遅くするための制御手段を設けたので、制御する電圧を
目標周波数に対する電圧に沿うようになめらかに近づけ
ることができ、これによりきめ細かく電圧を負荷にマッ
チングさせることができ、延いては効率の良い圧縮機の
運転を実現することができる。As explained above, according to the present invention, in the variable control mode in which the voltage/frequency value is varied according to the load, the controller having the inverter part is capable of performing constant control in which the voltage/frequency value is kept constant. Since we have provided a control means to slow down the speed of frequency variation compared to the mode, it is possible to smoothly bring the voltage to be controlled closer to the voltage for the target frequency, which allows for finely matching the voltage to the load. This makes it possible to realize efficient compressor operation.
【図１】この発明を示す冷凍装置の回路図である。FIG. 1 is a circuit diagram of a refrigeration system showing the present invention.
【図２】同冷凍装置における運転周波数を示す説明図で
ある。FIG. 2 is an explanatory diagram showing operating frequencies in the refrigeration system.
【図３】同冷凍装置における制御手段の動作を示すフロ
ーチャートである。FIG. 3 is a flowchart showing the operation of a control means in the refrigeration system.
【図４】冷凍装置における電圧−周波数特性を示す説明
図である。FIG. 4 is an explanatory diagram showing voltage-frequency characteristics in a refrigeration device.
１ 冷凍装置 ３ 蒸発器 ５ 圧縮機 ６ 凝縮器 ７ 減圧器 １０ インバータ部 １４ 制御手段 １６ 電動機 １８ 制御器 ３０ 冷媒管 ３１ 冷媒回路 1 Refrigeration equipment 3 Evaporator 5 Compressor 6 Condenser 7 Pressure reducer 10 Inverter section 14 Control means 16 Electric motor 18 Controller 30 Refrigerant pipe 31 Refrigerant circuit
Claims (1)
冷媒管で接続した冷媒回路と、圧縮機の駆動用電動機に
供給する電源の周波数および電圧を制御するインバータ
部を有する制御器とを備えた冷凍装置において、前記制
御器には、電圧／周波数の値を負荷に応じて可変する可
変制御モードでは前記値を一定値とする一定制御モード
と比較して周波数の可変速度を遅くするための制御手段
を設けたことを特徴とする冷凍装置。Claim 1: A controller comprising a refrigerant circuit in which a compressor, a condenser, a pressure reducer, and an evaporator are connected by refrigerant pipes, and an inverter section that controls the frequency and voltage of the power supply supplied to the motor for driving the compressor. In the refrigeration system, the controller has a variable control mode in which the voltage/frequency value is varied according to the load, in which the frequency is varied at a slower speed than in a constant control mode in which the value is kept constant. A refrigeration system characterized by being provided with a control means for controlling the refrigeration system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3041788A JP2940713B2 (en) | 1991-03-07 | 1991-03-07 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3041788A JP2940713B2 (en) | 1991-03-07 | 1991-03-07 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04281144A true JPH04281144A (en) | 1992-10-06 |
| JP2940713B2 JP2940713B2 (en) | 1999-08-25 |
Family
ID=12618089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3041788A Expired - Fee Related JP2940713B2 (en) | 1991-03-07 | 1991-03-07 | Refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2940713B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997013318A1 (en) * | 1995-10-06 | 1997-04-10 | Hitachi, Ltd. | Motor controller |
| JP2002115923A (en) * | 2000-10-06 | 2002-04-19 | Mitsubishi Electric Corp | Freezing apparatus and control method therefor |
| US6603280B2 (en) | 1998-04-02 | 2003-08-05 | Hitachi, Ltd. | Motor controller |
-
1991
- 1991-03-07 JP JP3041788A patent/JP2940713B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997013318A1 (en) * | 1995-10-06 | 1997-04-10 | Hitachi, Ltd. | Motor controller |
| US6603280B2 (en) | 1998-04-02 | 2003-08-05 | Hitachi, Ltd. | Motor controller |
| JP2002115923A (en) * | 2000-10-06 | 2002-04-19 | Mitsubishi Electric Corp | Freezing apparatus and control method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2940713B2 (en) | 1999-08-25 |
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