JPH07167480A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH07167480A JPH07167480A JP6170762A JP17076294A JPH07167480A JP H07167480 A JPH07167480 A JP H07167480A JP 6170762 A JP6170762 A JP 6170762A JP 17076294 A JP17076294 A JP 17076294A JP H07167480 A JPH07167480 A JP H07167480A
- Authority
- JP
- Japan
- Prior art keywords
- induction motor
- frequency
- compressor
- inverter
- scroll compressor
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
- 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】本発明は冷媒圧縮用にスクロール
圧縮機を用いた冷房もしくは暖房またはその双方の機能
を有する空気調和機に係り、特にスクロール圧縮機の容
量制御をするのに高キャリア周波数で駆動するインバー
タを用いてスクロール圧縮機を運転するようにした空気
調和機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a scroll compressor for refrigerant compression and having a cooling function and / or heating function, and more particularly to a high carrier frequency for controlling the capacity of the scroll compressor. The present invention relates to an air conditioner in which a scroll compressor is operated using an inverter driven by.
【０００２】[0002]
【従来の技術】運転周波数可変のインバータで冷媒圧縮
機の電動機を運転する空気調和機では、空気調和機の要
求能力に応じ、インバータの運転周波数を変化させて該
電動機の回転数を変えることにより圧縮機の容量制御を
行う。インバータは、直流（通常これは商用交流電源か
ら整流および平滑手段を用いて作られる）を運転周波数
に対応する周波数にて開閉される電力スイッチング素子
によって運転周波数の交流（一般には三相）に変換し、
電動機に出力する。同じトルクのもとで運転周波数の増
加に対応して電動機の回転数を増加させるためには、イ
ンバータの出力電圧を運転周波数の増加に応じて高くす
る必要がある。そのためには、前記変換される基になる
直流電圧を運転周波数に応じて可変とする方式もある
が、一般には、該直流電圧は一定とし、出力交流電圧を
運転周波数よりも遥かに高い周波数でチョップして、そ
のオン・デューティ比、ひいては時間的平均出力電圧を
運転周波数が高いほど大きくする様に構成した電圧型Ｐ
ＷＭ（パルス幅変調）方式のインバータを用いることが
多い。この様なパルス幅変調は、所与の上記の時間的平
均出力電圧と、高い周波数のキャリア電圧との比較に基
づき該キャリア周波数にて電力スイッチング素子を所要
のオン・デューティ比で断続することにより行われる。2. Description of the Related Art In an air conditioner in which an electric motor of a refrigerant compressor is driven by an inverter having a variable operating frequency, the operating frequency of the inverter is changed to change the rotational speed of the electric motor according to the required capacity of the air conditioner. It controls the capacity of the compressor. An inverter converts direct current (which is usually made from a commercial alternating current power supply using rectification and smoothing means) into alternating current at operating frequency (generally three-phase) by a power switching element that is opened and closed at a frequency corresponding to the operating frequency. Then
Output to electric motor. Under the same torque, in order to increase the rotation speed of the electric motor in response to the increase in the operating frequency, it is necessary to increase the output voltage of the inverter according to the increase in the operating frequency. For that purpose, there is also a method in which the DC voltage that is the basis for conversion is made variable according to the operating frequency, but generally, the DC voltage is kept constant and the output AC voltage is at a frequency much higher than the operating frequency. A voltage-type P that is configured to be chopped so that its on-duty ratio, and thus the temporal average output voltage, increases as the operating frequency increases.
In many cases, a WM (pulse width modulation) type inverter is used. Such pulse width modulation is achieved by interrupting the power switching element at the required on-duty ratio at the carrier frequency based on the comparison of the given temporal average output voltage with the high frequency carrier voltage. Done.
【０００３】従来、この様な電圧型ＰＷＭ方式のインバ
ータを用いた空気調和機においては、圧縮機を駆動する
インバータの運転周波数は３０Ｈｚから９０Ｈｚまで、
或いは３０Ｈｚから１１５Ｈｚまでとし、また、インバ
ータのキャリア周波数は１ｋＨｚ〜２ｋＨｚであった。Conventionally, in an air conditioner using such a voltage type PWM type inverter, the operating frequency of the inverter driving the compressor is from 30 Hz to 90 Hz,
Alternatively, it was set to 30 Hz to 115 Hz, and the carrier frequency of the inverter was 1 kHz to 2 kHz.
【０００４】なお、この種の装置として関連するもの
に、例えば、特開昭６２−１７８８３２号が挙げられ
る。A device related to this type of device is, for example, Japanese Patent Laid-Open No. 62-178832.
【０００５】[0005]
【発明が解決しようとする課題】上記従来技術は、電動
機を駆動するインバータのキャリア周波数が１〜２ｋＨ
ｚと低いために電動機から該キャリア周波数に因る可聴
域の電磁音が発生し、特に空気調和機として低周波数運
転を行なう場合にもこの電磁音はそのまま騒音となっ
て、快適性を損なうという問題があった。In the above-mentioned prior art, the carrier frequency of the inverter for driving the electric motor is 1 to 2 kHz.
Because of the low z, electromagnetic noise in the audible range due to the carrier frequency is generated from the electric motor, and even when low-frequency operation is performed as an air conditioner, this electromagnetic noise remains as noise and impairs comfort. There was a problem.
【０００６】又、低周波数運転を行なう場合、圧縮機の
回転数の低下により圧縮機内での給油圧が不充分とな
り、圧縮機の軸受部分に対する供給油が不充分となって
軸の摩耗につながる恐れがあるので、これを防ぐには最
低運転周波数を前述以下に下げることができないという
問題があった。When operating at low frequencies, the rotational speed of the compressor is reduced, resulting in insufficient hydraulic pressure in the compressor and insufficient oil supply to the bearing portion of the compressor, resulting in shaft wear. Therefore, there is a problem that in order to prevent this, the minimum operating frequency cannot be lowered below the above.
【０００７】本発明は、かかる従来の問題を改良するた
めに成されたものであって、その目的は耳障りな騒音を
減らし、低運転周波数でも圧縮機の回転数が過度に低下
することを防止し、最低運転周波数の引下げを可能にす
ることにある。The present invention has been made in order to improve the above-mentioned conventional problems, and its purpose is to reduce annoying noise and prevent excessive reduction of the rotational speed of the compressor even at a low operating frequency. However, the minimum operating frequency can be lowered.
【０００８】[0008]
【課題を解決するための手段】上記目的のため、本発明
の空気調和機は特許請求の範囲の各請求項に記載の特徴
を有する。To this end, the air conditioner of the present invention has the features set forth in the appended claims.
【０００９】[0009]
【作用】空気調和機の冷媒圧縮用の圧縮機にはスクロー
ル圧縮機を用い、該圧縮機用の誘導電動機を駆動する運
転周波数可変の電圧型ＰＷＭ方式のインバータのキャリ
ア周波数を１０ｋＨｚ以上とし、また、該誘導電動機の
すべりを所定適正にするよう制御して系を安定させて運
転する。A scroll compressor is used as a compressor for compressing a refrigerant in an air conditioner, and a carrier frequency of a voltage type PWM inverter having a variable operating frequency for driving an induction motor for the compressor is set to 10 kHz or more. , Control the slip of the induction motor to a predetermined proper value and stabilize the system for operation.
【００１０】それによって、電動機から発生する耳障り
な電磁音が低減でき、又、低周波数域においても電動機
の実回転数は安定するので、騒音低下、運転範囲の拡大
を行なうことができる。As a result, the annoying electromagnetic noise generated from the electric motor can be reduced, and the actual rotational speed of the electric motor is stabilized even in the low frequency range, so that noise can be reduced and the operating range can be expanded.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１において、１は室内機用熱交換器、２
は室外機用熱交換器、３は室内機用熱交換器１と室外機
用熱交換器２とを接続して冷凍サイクルを構成するため
の冷媒配管、４は冷凍サイクル用配管３に設けられ冷房
と暖房で冷凍サイクル内の冷媒の流れ方向を変える四方
弁、５は内部に誘導電動機６を有し誘導電動機６の回転
によって冷媒の吸入・圧縮・吐出を行なう機構を有する
スクロール圧縮機、７は供給電源、８は供給電源７を利
用してスクロール圧縮機５内の誘導電動機６を回転数制
御するインバータである。In FIG. 1, 1 is a heat exchanger for indoor units, 2
Is a heat exchanger for the outdoor unit, 3 is a refrigerant pipe for connecting the heat exchanger for the indoor unit 1 and the heat exchanger for the outdoor unit 2 to form a refrigeration cycle, and 4 is provided in the refrigeration cycle pipe 3. A four-way valve 5 for changing the flow direction of the refrigerant in the refrigerating cycle by cooling and heating has an induction motor 6 inside, and a scroll compressor having a mechanism for sucking, compressing and discharging the refrigerant by rotation of the induction motor 7, Is a power supply, and 8 is an inverter that controls the rotation speed of the induction motor 6 in the scroll compressor 5 by using the power supply 7.
【００１３】スクロール圧縮機５は、例えば図６の断面
図に示す如き構造を有するもので、誘導電動機６が回転
するとスクロール圧縮機５では固定スクロール１４の外
側の吸入口１６から低圧ガスが吹込まれ、渦巻状ラップ
を有する固定スクロール１４と旋回スクロール１５とで
形成される圧縮空間に封じ込められたガスは、誘導電動
機６に連結したクランク軸を介して駆動される旋回スク
ロール１５の旋回運動によってスクロールの渦巻状ラッ
プの中心に向って圧縮されてゆく。圧縮空間は中心部で
最小となり、ガスは最高に圧縮されて固定スクロール１
４の中心部の吐出口１４′から上部吐出室に吐出され、
次いで電動機室を経て吐出管１７から機外に吐出され
る。このようにして冷媒ガスは吸入→圧縮→吐出が連続
的に繰返され、吐出された冷媒は冷凍サイクルへ流れて
冷房あるいは暖房を行なう。The scroll compressor 5 has a structure as shown in the sectional view of FIG. 6, for example, and when the induction motor 6 rotates, low pressure gas is blown into the scroll compressor 5 from the suction port 16 outside the fixed scroll 14. The gas contained in the compression space formed by the fixed scroll 14 having the spiral wrap and the orbiting scroll 15 is scrolled by the orbiting motion of the orbiting scroll 15 driven via the crankshaft connected to the induction motor 6. It is compressed towards the center of the spiral wrap. The compression space is the smallest in the center, the gas is compressed to the maximum and the fixed scroll 1
It is discharged to the upper discharge chamber from the discharge port 14 'in the center of 4,
Then, it is discharged from the discharge pipe 17 to the outside of the machine through the motor room. In this way, the refrigerant gas is continuously sucked, compressed, and discharged, and the discharged refrigerant flows into the refrigeration cycle for cooling or heating.
【００１４】インバータ８は、図２に示すように、供給
電源７からの交流を直流に変換する整流素子９、平滑コ
ンデンサ１０、直流より新たに交流に変換するためのス
イッチング素子１１、誘導電動機６へ流れる電流を検出
するための電流センサ１２、電流センサ１２の検出した
電流値を取り込み、スイッチング素子１１を駆動するた
めの制御装置１３により構成されている。As shown in FIG. 2, the inverter 8 includes a rectifying element 9 for converting AC from the power supply 7 into DC, a smoothing capacitor 10, a switching element 11 for newly converting DC into AC, and an induction motor 6. A current sensor 12 for detecting a current flowing to the control device 13 and a control device 13 for fetching the current value detected by the current sensor 12 and driving the switching element 11.
【００１５】かかる構成により、供給電源７から供給さ
れる交流は整流素子９により直流に変換され、さらに平
滑コンデンサ１０により電流が平滑され、スイッチング
素子１１へ供給される。With this configuration, the alternating current supplied from the power supply 7 is converted into the direct current by the rectifying element 9, the current is smoothed by the smoothing capacitor 10, and the current is supplied to the switching element 11.
【００１６】一方、ここでは開示していないが、空気調
和機の室内側の運転状態が検出され、その運転状態が室
外側へ送信される。室外側では室内側から送信された運
転状態と室外側の運転状態を検出して圧縮機の運転指令
を制御装置１３へ送信する。この運転指令を受けて制御
装置１３はスイッチング素子１１をスイッチングさせる
ことにより、運転指令に従った任意所要の運転周波数の
交流を発生し、これを誘導電動機６に供給することによ
り、誘導電動機６を回転させる。スイッチング素子１１
には、本実施例では、ＩＧＢＴ（ゲート絶縁型バイポー
ラトランジスタ、Ｉｎｓｕｌａｔｅｄ ｇａｔｅ ｂｉ
ｐｏｌａｒ ｔｒａｎｓｉｓｔｏｒ）が用いられてい
る。インバータ制御装置１３は、運転周波数が高いほど
誘導電動機６への出力の時間的平均電圧を高くする様な
ＰＷＭ（パルス幅変調）を行なうので、誘導電動機６は
運転周波数が高いほど速い回転数で回転し、以てスクロ
ール圧縮機５の容量制御が可能となる。本実施例では、
このＰＷＭのチョッピング周波数すなわちキャリア周波
数は１０ｋＨｚ以上とし、これにより、可聴周波数の電
磁音が誘導電動機６から発生しないようにする。On the other hand, although not disclosed here, the operating state of the indoor side of the air conditioner is detected and the operating state is transmitted to the outdoor side. On the outdoor side, the operating state transmitted from the indoor side and the operating state on the outdoor side are detected, and the operation command of the compressor is transmitted to the control device 13. Upon receiving this operation command, the control device 13 switches the switching element 11 to generate an alternating current of an arbitrary required operating frequency according to the operation command, and supplies the alternating current to the induction motor 6 to drive the induction motor 6. Rotate. Switching element 11
In the present embodiment, an IGBT (gate insulation type bipolar transistor, Insulated gate bi) is used.
A polar transistor) is used. The inverter control device 13 performs PWM (pulse width modulation) such that the higher the operating frequency is, the higher the temporal average voltage of the output to the induction motor 6 is. Therefore, the higher the operating frequency of the induction motor 6, the faster the rotation speed of the induction motor 6. The rotation causes the capacity of the scroll compressor 5 to be controlled. In this embodiment,
The chopping frequency of the PWM, that is, the carrier frequency is set to 10 kHz or higher so that electromagnetic noise of an audible frequency is not generated from the induction motor 6.
【００１７】冷房運転の場合には、運転開始後、室内温
度が下って来て設定温度に近づくほど、また暖房運転の
場合には室内温度が上って来て設定温度に近づくほど、
すなわち冷房負荷または暖房負荷が小さくなるほど、イ
ンバータの運転周波数を下げて誘導電動機６の回転数を
下げ、所定の最小冷房負荷または最小暖房負荷では最低
運転周波数のもとで誘導電動機６は最低運転速度で回転
する。In the case of the cooling operation, after the operation is started, as the room temperature decreases and approaches the set temperature, and in the heating operation, the room temperature rises and approaches the set temperature.
That is, as the cooling load or the heating load decreases, the operating frequency of the inverter is lowered to lower the rotation speed of the induction motor 6, and the induction motor 6 operates at the minimum operating speed under the minimum operating frequency at a predetermined minimum cooling load or minimum heating load. To rotate.
【００１８】最低運転周波数より低い周波数が要求され
る様な場合には、圧縮機の運転は停止され、その後再び
運転される様になっている。従ってその様な場合は圧縮
機の停止・運転が反復して室温はハンチングを起すこと
になる。それ故、図３に示すように、最低運転周波数を
低く設定する方が室温の変化が少なく快適性が向上する
ことになる。When a frequency lower than the minimum operating frequency is required, the compressor is stopped and then restarted. Therefore, in such a case, the compressor is repeatedly stopped and operated, causing hunting at room temperature. Therefore, as shown in FIG. 3, when the lowest operating frequency is set low, the change in room temperature is small and the comfort is improved.
【００１９】しかし、最低運転周波数を下げれば圧縮機
が低回転数になるので、圧縮機の回転を利用したポンプ
作用による給油圧で軸受部に給油する構造の一般的なス
クロール圧縮機では、油の給油圧が不充分となって圧縮
機の軸受部分に対する供給油が不充分となり、軸受部の
摩耗につながる恐れがあるため、単純には最低運転周波
数を下げることができない。However, if the minimum operating frequency is lowered, the compressor will have a low rotational speed. Therefore, in a general scroll compressor having a structure in which oil is supplied to the bearing portion by hydraulic pressure by the pump action utilizing the rotation of the compressor, However, the minimum operating frequency cannot be simply lowered because the oil supply pressure is insufficient and the oil supplied to the bearing portion of the compressor becomes insufficient, which may lead to wear of the bearing portion.
【００２０】そこで本実施例では、下記の如き手段を講
じる。Therefore, in this embodiment, the following means are taken.
【００２１】電流センサ１２によりスクロール圧縮機５
駆動用の誘導電動機６へ流れる電流を検出し、この検出
された電流から圧縮機駆動用の誘導電動機６の電流の励
磁成分を分離してトルク成分のみを検出して、このトル
ク成分から誘導電動機６のすべりを計測する。図４に示
すようにスクロール圧縮機５への負荷、したがってトル
ク、が増大すると誘導電動機６のすべりが大きくなり、
実回転数が低下し（実回転数を破線で示す）、このた
め、低周波数域においては実回転数の低下により給油圧
が不充分になる。これを防ぐために本実施例では前述の
如く誘導電動機６のすべりを計測して、すべりを補正す
ることにより、実回転数を当該運転周波数における所定
の実回転数より低下させることがない様にし、以て供給
油を確保することができるようにする。The current sensor 12 allows the scroll compressor 5
The current flowing to the driving induction motor 6 is detected, the exciting component of the current of the compressor driving induction motor 6 is separated from the detected current, only the torque component is detected, and the induction motor is detected from this torque component. Measure the slip of 6. As shown in FIG. 4, when the load on the scroll compressor 5, and hence the torque, increases, the slip of the induction motor 6 increases,
The actual rotation speed decreases (the actual rotation speed is indicated by a broken line), and therefore, in the low frequency range, the supply oil pressure becomes insufficient due to the decrease in the actual rotation speed. In order to prevent this, in the present embodiment, the slip of the induction motor 6 is measured and the slip is corrected as described above, so that the actual rotation speed is not lowered below a predetermined actual rotation speed at the operating frequency. So that the oil supply can be secured.
【００２２】このすべりの補正は例えば図５に示す様に
行なう。同図において、或る運転周波数ｆにおいて誘導
電動機６の動作状態が破線Ｓ上のｂ点にあるとする。該
破線Ｓの横軸との交点ｄは当該周波数ｆでの同期速度
（すなわち、すべりゼロ）を表わしている。このすべり
を電流センサ１２の検出出力から前記の如く計測し、こ
れに基づき制御装置１３は、同じトルク下でのすべりを
ｂ点から同破線Ｓ上の所定の適正すべりに相当する点ａ
に補正する様に、周波数ｆに周波数補正分Δｆを加えた
周波数にインバータを制御する。これにより誘導電動機
６は、この補正後の周波数での動作曲線（破線Ｓ′）上
の同一トルクでの点ｃ（これはａ点に対応）で運転され
る結果となる。この様にして誘導電動機６のすべりを適
正すべりに補正する制御がなされる。The slip correction is performed as shown in FIG. 5, for example. In the figure, it is assumed that the operating state of the induction motor 6 is at a point b on the broken line S at a certain operating frequency f. The intersection d of the broken line S with the horizontal axis represents the synchronization speed (that is, zero slip) at the frequency f. This slip is measured from the detection output of the current sensor 12 as described above, and based on this, the control device 13 determines the slip under the same torque from the point b to a point a corresponding to a predetermined proper slip on the broken line S.
The inverter is controlled to a frequency obtained by adding the frequency correction component Δf to the frequency f so that the frequency is corrected. As a result, the induction motor 6 is operated at the point c (which corresponds to the point a) at the same torque on the operation curve (broken line S ′) at the corrected frequency. In this way, the control for correcting the slip of the induction motor 6 to a proper slip is performed.
【００２３】上記のすべりの補正制御は、各運転周波数
について行なうことも可能であるが、実際上は、低運転
周波数域（例えば６０Ｈｚ以下）で、または最低運転周
波数の近傍でのみ行なうようにしてもよい。The above-described slip correction control can be performed for each operating frequency, but in practice, it should be performed only in the low operating frequency range (for example, 60 Hz or less) or near the minimum operating frequency. Good.
【００２４】従来、図４において最低周波数ｆ1 まで運
転可能な場合に、運転範囲の負荷状態からＡ点が限界だ
とすると、本実施例では上記の如きすべりの補正制御を
することにより、最低運転周波数をｆ0 まで低下させる
ことが可能である。Conventionally, when it is possible to drive to the lowest frequency f 1 in FIG. 4, assuming that the point A is the limit from the load condition of the operating range, in this embodiment, the minimum operating frequency is controlled by performing the slip correction control as described above. Can be reduced to f 0 .
【００２５】又、本発明では圧縮機としてはスクロール
圧縮機を使用するので、図７に示す如く他の形式の圧縮
機（破線で示す）に比べて１回転中の仕事量の変化、す
なわち圧縮トルクの変動が少なく、振動、音の発生も少
ない。このため、低周波数域に向く特性がある。Further, in the present invention, since the scroll compressor is used as the compressor, the change in the work amount during one rotation, that is, the compression is compared with the compressor of another type (shown by the broken line) as shown in FIG. Little fluctuation in torque, less vibration and noise. Therefore, it has a characteristic suitable for a low frequency range.
【００２６】また、図８、図９に示す如く、ＰＷＭのた
めに行なうスイッチング素子のスイッチング周波数（キ
ャリア周波数）が従来技術の如く１〜２ｋＨｚと低い場
合には、誘導電動機６の給電がスイッチングされるため
に生ずる可聴域の電磁音が発生し、特に低周波数運転を
行なう場合にはこの電磁音が騒音として無視できなくな
る。しかし、本発明ではキャリア周波数を１０ｋＨｚ以
上に上げることにより、人の可聴域を超えるレベルに近
づくと電磁音の影響がなくなり、低騒音化の効果があ
る。Further, as shown in FIGS. 8 and 9, when the switching frequency (carrier frequency) of the switching element for PWM is as low as 1 to 2 kHz as in the prior art, the power feeding of the induction motor 6 is switched. As a result, electromagnetic noise in the audible range is generated, and this electromagnetic noise cannot be ignored as noise especially when low-frequency operation is performed. However, in the present invention, by raising the carrier frequency to 10 kHz or higher, the effect of electromagnetic noise disappears when the level exceeds the human audible range, and there is an effect of noise reduction.
【００２７】またＩＧＢＴインバータのキャリア周波数
を１０ｋＨｚ以上の高キャリア周波数とすることによ
り、インバータの出力交流を正弦波形により近づけるこ
とができ、この結果、スクロール圧縮機の駆動用電動機
の効率を向上でき、モータ巻線の温度（発熱量）を低下
できる。この結果、モータをケーシング内部の密閉チャ
ンバー内に位置させ、この密閉チャンバー内を圧縮機吐
出ガスにより高圧状態にする高圧チャンバー方式のスク
ロール圧縮機に本発明を適用することにより、圧縮機の
圧縮効率も向上できる効果がある。Further, by setting the carrier frequency of the IGBT inverter to a high carrier frequency of 10 kHz or more, the output AC of the inverter can be made closer to the sine waveform, and as a result, the efficiency of the driving motor for the scroll compressor can be improved, The temperature (heat generation amount) of the motor winding can be reduced. As a result, the compression efficiency of the compressor is improved by applying the present invention to the scroll compressor of the high-pressure chamber system in which the motor is located in the closed chamber inside the casing and the closed chamber is in a high pressure state by the compressor discharge gas. There is an effect that can be improved.
【００２８】[0028]
【発明の効果】本発明によれば、電圧型ＰＷＭ方式のイ
ンバータのキャリア周波数を上げることにより騒音の低
下が可能であり、また、スクロール圧縮機を用いること
で低周波数域にも適用でき、このように、高キャリア周
波数の電圧型ＰＷＭ方式のインバータでスクロール圧縮
機の電動機を駆動する方式の空気調和機としたことによ
り、低騒音の空気調和機を実現し得る。すなわち、スク
ロール圧縮機の使用により圧縮機の低騒音化が達成さ
れ、またインバータに起因する耳障りな電磁音の発生も
キャリア周波数を上げることで解消され、空気調和機全
体としての低騒音化を達成し得る。又、圧縮機駆動用の
誘導電動機のすべりを制御することで、運転周波数の下
限をさらに下げることが可能であるので、快適性の向上
に効果がある。According to the present invention, noise can be reduced by increasing the carrier frequency of the voltage type PWM type inverter, and it can be applied to a low frequency range by using a scroll compressor. As described above, a low noise air conditioner can be realized by using the air conditioner of the type in which the electric motor of the scroll compressor is driven by the inverter of the voltage type PWM method of the high carrier frequency. In other words, the noise reduction of the compressor was achieved by using the scroll compressor, and the generation of annoying electromagnetic noise due to the inverter was also eliminated by raising the carrier frequency, and the noise reduction of the air conditioner as a whole was achieved. You can Further, by controlling the slip of the induction motor for driving the compressor, it is possible to further lower the lower limit of the operating frequency, which is effective in improving comfort.
【図１】本発明の一実施例の空気調和機の全体概要図。FIG. 1 is an overall schematic diagram of an air conditioner according to an embodiment of the present invention.
【図２】図１におけるインバータ部の全体図。FIG. 2 is an overall view of an inverter unit in FIG.
【図３】最低周波数の違いによる空気調和機の室温変化
の違いを示す図。FIG. 3 is a diagram showing a difference in room temperature change of the air conditioner due to a difference in minimum frequency.
【図４】本発明の一実施例の空気調和機のトルク変化を
示す図。FIG. 4 is a diagram showing a torque change of the air conditioner according to the embodiment of the present invention.
【図５】本発明の一実施例における誘導電動機のすべり
補正の説明図。FIG. 5 is an explanatory diagram of slip correction of the induction motor in the embodiment of the present invention.
【図６】スクロール圧縮機の断面構造図。FIG. 6 is a cross-sectional structural diagram of a scroll compressor.
【図７】各種型式の圧縮機のトルク特性図。FIG. 7 is a torque characteristic diagram of various types of compressors.
【図８】本発明の一実施例と従来技術とのキャリア周波
数の特性図。FIG. 8 is a carrier frequency characteristic diagram of an embodiment of the present invention and a conventional technique.
【図９】本発明の一実施例と従来技術との騒音比較図。FIG. 9 is a noise comparison diagram of an embodiment of the present invention and a conventional technique.
１…室内機用熱交換器 ２…室外機用熱
交換器 ４…四方弁 ５…スクロール
圧縮機 ６…誘導電動機 ７…供給電源 ８…インバータ ９…整流素子 １０…平滑コンデンサ １１…スイッチ
ング素子 １２…電流センサ １３…制御装置1 ... Indoor unit heat exchanger 2 ... Outdoor unit heat exchanger 4 ... Four-way valve 5 ... Scroll compressor 6 ... Induction motor 7 ... Supply power 8 ... Inverter 9 ... Rectifying element 10 ... Smoothing capacitor 11 ... Switching element 12 ... Current sensor 13 ... Control device
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０２Ｐ 7/63 ３０２ Ｋ Ｆ Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location H02P 7/63 302 K F
Claims (3)
冷凍サイクルを有する空気調和機において、該スクロー
ル圧縮機の駆動用電動機が誘導電動機であり、１０ｋＨ
ｚ以上の高キャリア周波数でパルス幅変調された可変運
転周波数の交流電圧を該誘導電動機に与える電圧型ＰＷ
Ｍ方式のインバータを備えたことを特徴とする空気調和
機。1. An air conditioner having a refrigeration cycle equipped with a scroll compressor for compressing a refrigerant, wherein an electric motor for driving the scroll compressor is an induction motor and 10 kH.
Voltage type PW for applying to the induction motor an AC voltage having a variable operating frequency which is pulse width modulated at a high carrier frequency of z or more
An air conditioner characterized by having an M-type inverter.
べりを検出し、検出された該すべりが所定の適正値にな
る様にすべりを補正する制御手段を有することを特徴と
する請求項１記載の空気調和機。2. The inverter according to claim 1, further comprising control means for detecting a slip of the induction motor and correcting the slip so that the detected slip has a predetermined proper value. Air conditioner.
数が最低運転周波数もしくはそれに近い運転周波数のと
きに前記すべりの補正を行うことを特徴とする請求項１
記載の空気調和機。3. The control means corrects the slip when the operating frequency of the inverter is at or near the lowest operating frequency.
Air conditioner described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6170762A JPH07167480A (en) | 1989-09-27 | 1994-07-22 | Air conditioner |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24914589 | 1989-09-27 | ||
| JP1-249145 | 1989-09-27 | ||
| JP6170762A JPH07167480A (en) | 1989-09-27 | 1994-07-22 | Air conditioner |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2134314A Division JP2755469B2 (en) | 1989-09-27 | 1990-05-24 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07167480A true JPH07167480A (en) | 1995-07-04 |
Family
ID=26493663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6170762A Pending JPH07167480A (en) | 1989-09-27 | 1994-07-22 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07167480A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009089534A (en) * | 2007-10-01 | 2009-04-23 | Daihen Corp | Pwm signal generating circuit, grid connection inverter system with this pwm signal generating circuit, and program for achieving this pwm signal generating circuit |
| JP2014068428A (en) * | 2012-09-25 | 2014-04-17 | Mitsubishi Electric Corp | Power conversion device |
| JP2016208557A (en) * | 2015-04-15 | 2016-12-08 | 富士電機株式会社 | Control device for power conversion device |
| US9825575B2 (en) | 2014-07-04 | 2017-11-21 | Mitsubishi Electric Corporation | Power converting apparatus, dehumidifier, air conditioner, and refrigeration apparatus |
-
1994
- 1994-07-22 JP JP6170762A patent/JPH07167480A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009089534A (en) * | 2007-10-01 | 2009-04-23 | Daihen Corp | Pwm signal generating circuit, grid connection inverter system with this pwm signal generating circuit, and program for achieving this pwm signal generating circuit |
| JP2014068428A (en) * | 2012-09-25 | 2014-04-17 | Mitsubishi Electric Corp | Power conversion device |
| US9825575B2 (en) | 2014-07-04 | 2017-11-21 | Mitsubishi Electric Corporation | Power converting apparatus, dehumidifier, air conditioner, and refrigeration apparatus |
| JP2016208557A (en) * | 2015-04-15 | 2016-12-08 | 富士電機株式会社 | Control device for power conversion device |
| US10135352B2 (en) | 2015-04-15 | 2018-11-20 | Fuji Electric Co., Ltd. | Controller for power converter with frequency modulated carrier |
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