JPH0744796B2 - Hermetic electric compressor - Google Patents
Hermetic electric compressorInfo
- Publication number
- JPH0744796B2 JPH0744796B2 JP62234221A JP23422187A JPH0744796B2 JP H0744796 B2 JPH0744796 B2 JP H0744796B2 JP 62234221 A JP62234221 A JP 62234221A JP 23422187 A JP23422187 A JP 23422187A JP H0744796 B2 JPH0744796 B2 JP H0744796B2
- Authority
- JP
- Japan
- Prior art keywords
- winding
- compressor
- current density
- electric
- electric 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.)
- Expired - Lifetime
Links
Landscapes
- Windings For Motors And Generators (AREA)
- Superconductive Dynamoelectric Machines (AREA)
Description
この発明は、冷凍，空気調和機等の冷媒ガスの圧縮に用
いられる密閉形電動圧縮機に関する。The present invention relates to a hermetic electric compressor used for compressing refrigerant gas such as refrigeration and air conditioners.
従来、日本冷凍協会出版「密閉形冷凍機」10.2節に開示
された密閉形電動圧縮機は、密閉容器内に収容した圧縮
要素，及びこれを駆動する誘導電動機である電動要素と
から成り、電動要素により圧縮要素を回転することで、
冷媒ガスを密閉容器外に配置した吸入マフラから圧縮要
素内へ吸入し、圧縮した後、密閉容器内の空間に放出
し、電動要素の隙間を上昇する冷媒を、密閉容器に設け
た吐出管から外部の蒸発器へ導出するようになってい
る。 一般に、電動圧縮機の電動要素である誘導電動機では、
無負荷で滑りｓが０の同期速度と最大トルクで滑りが最
大smとの間で運転され、その滑りの増加に従い巻線電流
が増大する。圧縮機の最大運転条件はsm以下の滑りで運
転されるよう設定される。しかし、滑りが１の起動時及
びロック時には上記最大運転条件下での巻線電流より大
きい電流が流れる。Conventionally, the hermetic electric compressor disclosed in Section 10.2 published by the Japan Refrigeration Association "Hermetic refrigerator" consists of a compression element housed in a hermetic container and an electric element that is an induction motor for driving the electric element. By rotating the compression element by the element,
Refrigerant gas is sucked into the compression element from the suction muffler arranged outside the closed container, compressed, and then discharged into the space inside the closed container, and the refrigerant that rises in the gap of the electric element is discharged from the discharge pipe provided in the closed container. It is led to an external evaporator. Generally, in an induction motor which is an electric element of an electric compressor,
With no load, the slip s is operated between a synchronous speed of 0 and the maximum torque at the maximum sm, and the winding current increases as the slip increases. The maximum operating conditions of the compressor are set so that the compressor operates with slip of less than sm. However, when starting and locking when the slip is 1, a current larger than the winding current under the maximum operating condition flows.
【発明が解決しようとする問題点】 上記のような従来の密閉形電動圧縮機では、電動要素を
構成する巻線が常伝導材から成っているため、それの抵
抗値が起動時やロック時の電流制限には役立っているも
のの、電動要素の通常運転範囲内である運転許容圧力範
囲内において、圧縮機運転圧力が上昇して巻線電流が増
大すると、ジュールの法則によって巻線温度が上昇し、
これに伴い電動要素のみならず圧縮要素の摺動部も温度
上昇し、圧縮機の信頼性が低下すると云う問題があっ
た。 この発明は、上記のような問題点を解決するためになさ
れたもので、運転許容圧力範囲内では巻線温度を低温に
保ち、信頼性の高い密閉形電動圧縮機を提供することを
目的とする。[Problems to be Solved by the Invention] In the conventional hermetic electric compressor as described above, since the windings constituting the electric element are made of the normal conductive material, the resistance value thereof is at the time of starting or locking. However, if the compressor operating pressure rises and the winding current increases within the allowable operating pressure range that is the normal operating range of the electric element, the winding temperature rises according to Joule's law. Then
Along with this, not only the electric element but also the sliding portion of the compression element rises in temperature, and there is a problem that the reliability of the compressor decreases. The present invention has been made to solve the above problems, and an object of the present invention is to provide a highly reliable hermetic electric compressor that maintains the winding temperature at a low temperature within the operation allowable pressure range. To do.
この発明に係る密閉形電動圧縮機は、誘導電動機である
電動要素の固定子巻線を超電導材料により形成すると共
に、この超電導材料の臨界電流密度が、圧縮要素の最大
運転条件下における巻線の電流密度と起動時における巻
線の電流密度との中間値となるようにしたものである。In the hermetic electric compressor according to the present invention, the stator winding of the electric element that is an induction motor is formed of a superconducting material, and the critical current density of the superconducting material is the winding of the winding under the maximum operating condition of the compression element. This is set to an intermediate value between the current density and the current density of the winding at the time of startup.
この発明においては、臨界電流密度が、圧縮要素の最大
運転条件下における巻線の電流密度と、起動時における
巻線の電流密度との中間値をとる超電導材料により電動
要素の巻線を形成するから、圧縮機の最大運転条件下に
おいて、巻線にジュール熱の発生がほとんどなく、巻線
温度を低温に維持できると共に、圧縮機の信頼性を向上
できる。According to the present invention, the critical current density takes an intermediate value between the current density of the winding under the maximum operating condition of the compression element and the current density of the winding at the time of starting to form the winding of the electrically driven element by the superconducting material. Therefore, under the maximum operating condition of the compressor, Joule heat is hardly generated in the winding, the winding temperature can be kept low, and the reliability of the compressor can be improved.
以下、この発明の密閉形電動圧縮機の実施例を図面につ
いて説明する。 第１図は、この発明方式を適用いた密閉形電動圧縮機の
断面図である。同図において、１は密閉容器、２は密閉
容器１内に上部に位置して装着した誘導電動機である電
動要素で、固定子2aと回転子2bを備え、固定子2aの巻線
2cは、特定の臨界磁束密度，臨界電流密度及び臨界温に
おいて超電導現象を生じる超電導材料から形成され、そ
して、超電導材料の臨界電流密度は、圧縮機の最大運転
条件下における巻線の電流密度と起動時にける巻線の電
流密度との中間値となるように設定されている。 また、前記密閉容器１内の下部側には圧縮要素３が装着
されており、この圧縮要素３は前記電動要素２の回転子
3bに直結されている。 また、第１図において、４は吸入マフラ、５は圧縮され
た冷媒を容器の外へ導出する吐出管である。 第２図は、電動要素２の固定子巻線2cに使用される超電
導材料の抵抗一電流密度特性を示す。 この第２図において、巻線2cの超電導現象が消失する臨
界電流密度ILは、圧縮機の最大運転条件（圧縮要素によ
り決定される運転許容圧力の上限）における巻線2cの電
流密度IMAXと、圧縮機の起動時に巻線に流れる電流密度
Isの中間に選定されている。 従って、圧縮要素3bに最大運転条件の範囲内で運転され
る時は、巻線2cは超電導状態におかれるため、巻線2cで
のジュール熱の発生がほとんどなく、その結果、巻線2c
を含めた電動要素２の温度は低温に維持され、圧縮要素
３の温度が上昇することがない。 また、圧縮機の起動時は、巻線2cには臨界電流密度ILを
越える起動電流が流れるため、巻線2cの超電導現象が消
失し、その結果、巻線2cの抵抗は第２図に示すように増
大するので、起動電流は従来並に維持されることにな
る。 このような本実施にあっては、圧縮機の運転許容圧力範
囲での巻線温度を低温に維持できると共に、起動時の起
動電流も制限でき、圧縮機の信頼性を向上できる。 なお、本発明においては、電流要素２の巻線部分に、温
度又は温度と電流の両方を検知して作動する保護素子を
埋設すれば、臨界電流密度以上の運転条件、もしくは、
圧縮機の起動不良による起動電流の連続通電下における
巻線温度の急上昇に伴う保護ができ、良好な密閉形電動
圧縮機を提供できる。 また、上記実施例ではかご形電動要素の巻線を超電導材
料により形成した場合について述べたが、巻線形電動要
素の場合は、固定子及び回転子の両方の巻線が第２図に
示す特性の超電導材料により形成される。An embodiment of a hermetic electric compressor of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a hermetic electric compressor to which the method of the present invention is applied. In the figure, 1 is an airtight container, 2 is an electric element which is an induction motor mounted in the upper part of the airtight container 1, and is provided with a stator 2a and a rotor 2b, and a winding wire of the stator 2a.
2c is formed from a superconducting material that causes a superconducting phenomenon at a specific critical magnetic flux density, critical current density and critical temperature, and the critical current density of the superconducting material is equal to the current density of the winding under the maximum operating condition of the compressor. It is set to an intermediate value with the current density of the winding at startup. A compression element 3 is mounted on the lower side of the closed container 1, and the compression element 3 is a rotor of the electric element 2.
It is directly connected to 3b. Further, in FIG. 1, 4 is a suction muffler, and 5 is a discharge pipe for discharging the compressed refrigerant to the outside of the container. FIG. 2 shows the resistance-current density characteristics of the superconducting material used for the stator winding 2c of the electric element 2. In FIG. 2, the critical current density I L at which the superconducting phenomenon of the winding 2c disappears is the current density IMAX of the winding 2c under the maximum operating condition of the compressor (the upper limit of the allowable operating pressure determined by the compression element). , The current density flowing in the winding when the compressor starts
Selected in the middle of I s . Therefore, when the compression element 3b is operated within the range of the maximum operation condition, the winding 2c is in a superconducting state, so that Joule heat is hardly generated in the winding 2c, and as a result, the winding 2c is generated.
The temperature of the electric element 2 including is kept low, and the temperature of the compression element 3 does not rise. At the time of starting the compressor, a starting current exceeding the critical current density I L flows through the winding 2c, so that the superconducting phenomenon of the winding 2c disappears, and as a result, the resistance of the winding 2c is as shown in FIG. Since it increases as shown, the starting current will be maintained at the same level as the conventional one. In the present embodiment as described above, the winding temperature in the allowable operating pressure range of the compressor can be maintained at a low temperature, and the starting current at the time of starting can be limited, so that the reliability of the compressor can be improved. In the present invention, if a protection element that operates by detecting temperature or both temperature and current is embedded in the winding portion of the current element 2, an operating condition of a critical current density or higher, or
It is possible to provide a good hermetic electric compressor, which can be protected due to a sudden increase in the winding temperature under continuous energization of the starting current due to defective starting of the compressor. Further, in the above embodiment, the case where the winding of the squirrel cage electric element is formed of the superconducting material has been described, but in the case of the winding electric element, both the windings of the stator and the rotor have the characteristics shown in FIG. Of superconducting material.
以上のように、この発明によれば、臨界電流密度が、圧
縮要素の最大運転条件下における巻線の電流密度と、起
動時における巻線の電流密度との中間値をとる超電導材
料により電動要素の巻線を形成するから、圧縮機の最大
運転条件下において巻線にジュール熱の発生がほとんど
なく、巻線を含めた電動要素の温度を低い温度に保持で
き、これに伴い圧縮機の信頼性を大幅に向上できる。As described above, according to the present invention, the critical current density is an electric element made of a superconducting material that takes an intermediate value between the current density of the winding under the maximum operating condition of the compression element and the current density of the winding at startup. Since the winding is formed, the Joule heat is hardly generated in the winding under the maximum operating condition of the compressor, and the temperature of the electric elements including the winding can be maintained at a low temperature. You can greatly improve the property.
第１図はこの発明の密閉形電動圧縮機の実施例を示す断
面図、第２図は実施例における巻線材料の抵抗一電流密
度特性図である。 １…密閉容器、２…電動要素、2a…固定子,2b…回転子,
2c…巻線、３…圧縮要素。FIG. 1 is a sectional view showing an embodiment of the hermetic electric compressor of the present invention, and FIG. 2 is a resistance-current density characteristic diagram of winding materials in the embodiment. 1 ... Airtight container, 2 ... Electric element, 2a ... Stator, 2b ... Rotor,
2c ... winding, 3 ... compression element.
フロントページの続き (72)発明者 滝本 直 静岡県静岡市小鹿３丁目18番１号 三菱電 機株式会社静岡製作所内 (56)参考文献 特開 昭59−198868（ＪＰ，Ａ)Front page continuation (72) Inventor Nao Takimoto 3-18-1, Oka, Shizuoka City, Shizuoka Prefecture Mitsubishi Electric Corporation Shizuoka Plant (56) Reference JP-A-59-198868 (JP, A)
Claims (1)
ある電動要素を密閉容器内に収容してなる密閉形電動圧
縮機において、前記電動要素の固定子巻線を超電導材料
により形成し、前記超電導材料の臨界電流密度を、圧縮
機の最大運転条件下における巻線の電流密度と起動時に
おける巻線の電流密度との中間値に設定したことを特徴
とする密閉形電動圧縮機。1. A hermetic electric compressor in which a compression element and an electric element that is an induction motor for driving the compression element are housed in a hermetically sealed container, wherein a stator winding of the electric element is formed of a superconducting material. A hermetic electric compressor, wherein the critical current density of the superconducting material is set to an intermediate value between the current density of the winding under the maximum operating conditions of the compressor and the current density of the winding at startup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62234221A JPH0744796B2 (en) | 1987-09-18 | 1987-09-18 | Hermetic electric compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62234221A JPH0744796B2 (en) | 1987-09-18 | 1987-09-18 | Hermetic electric compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6481636A JPS6481636A (en) | 1989-03-27 |
| JPH0744796B2 true JPH0744796B2 (en) | 1995-05-15 |
Family
ID=16967597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62234221A Expired - Lifetime JPH0744796B2 (en) | 1987-09-18 | 1987-09-18 | Hermetic electric compressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0744796B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1348251A1 (en) * | 2000-12-29 | 2003-10-01 | General Electric Company | Superconductive armature winding for an electrical machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59198868A (en) * | 1983-04-22 | 1984-11-10 | Toshiba Corp | Rotor of superconductive rotary electric machine |
-
1987
- 1987-09-18 JP JP62234221A patent/JPH0744796B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6481636A (en) | 1989-03-27 |
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