JP3761749B2 - Compressor motor and compressor - Google Patents
Compressor motor and compressor Download PDFInfo
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- JP3761749B2 JP3761749B2 JP25581899A JP25581899A JP3761749B2 JP 3761749 B2 JP3761749 B2 JP 3761749B2 JP 25581899 A JP25581899 A JP 25581899A JP 25581899 A JP25581899 A JP 25581899A JP 3761749 B2 JP3761749 B2 JP 3761749B2
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Description
【０００１】
【発明の属する技術分野】
本発明は空気調和装置等に搭載される圧縮機に組み込まれる圧縮機用電動機に関し、特に電動機の固定子の構造に関する。
【０００２】
【従来の技術】
図１に示すように、空気調和装置に搭載される圧縮機１は、電動機部２と圧縮部１１から構成されている。
電動機部２は、回転軸３に一体に取付けられる回転子４と、この回転子４の外周面と狭小の間隙を在して配置される固定子５とから構成される。
【０００３】
図１０に従来の固定子の組立図を示す。また、図１１に図１０中のＡ−Ａ線における断面図を示す。また、図１２に図１１の一部拡大図を示す。
図１１に示すように固定子５は、電磁鋼板を積層した固定子鉄心６に絶縁部材７を嵌め、その上に巻線８を巻くことによって形成される。
【０００４】
固定子５において、固定子鉄心６の回転軸３の軸方向と同一方向の長さをｔ、同様に固定子５の上端と下端に巻線８が延出して形成されるコイルエンド９１とコイルエンド９２からなるコイルエンド部９の長さをｈとすると、コイルエンド部９と固定子鉄心６の比（ｈ／ｔ）が０．６より大きくなっていた。
ここで、ｈはコイルエンド部全ての長さ（コイルエンド９１の長さｈ１とコイルエンド９２の長さｈ２の合計）である。
【０００５】
また、一般的に絶縁部材７には、ポリエステルフィルムが用いられ、その体積抵抗は１×１０８Ωより小さかった。
【０００６】
そして、前記電動機２が駆動する際に巻線８を流れる電流は以下の２つの経路を通り、漏洩電流となっていた。
１） 巻線８に付着した潤滑油または冷媒を通り圧縮機ケース１０に流れる。
２） 固定子鉄心６と巻線８の間の絶縁材７を通過して固定子鉄心６を流れる。
【０００７】
このような従来の構成では、コイルエンド部９の占める割合が多い分、巻線８に付着する潤滑油や冷媒も多く、巻線へ流れる電流が漏洩しやすかった。また、絶縁部材７に用いる材料の体積抵抗も小さいため、絶縁が不完全であり、固定子鉄心６へも漏洩していた。
【０００８】
【発明が解決しようとする課題】
上述した従来の構成においては、漏洩電流を減らすために、巻線の径を細くするという対策がとられていた。
【０００９】
しかしながら、巻線の径を細くするという対策では、銅損が大きくなり、電動機の効率が低下するなどの問題があった。
【００１０】
本発明は、上記事情を考慮してなされたもので、漏洩電流を少なくし、効率の良い圧縮機用電動機および圧縮機を提供することを目的とするものである。
【００１１】
【課題を解決するための手段】
上記課題を解決するために請求項１の発明は、内周部に沿って複数の磁極歯が所定間隔を在して放射状に設置される環状の固定子鉄心と、前記固定子鉄心の磁極歯に絶縁部材を介して巻装される巻線とからなる固定子の前記巻線を集中巻とするとともに、固定子鉄心の回転軸軸方向と同一方向の長さに対する前記固定子の上端と下端に巻線が延出してなるコイルエンドの前記回転軸軸方向と同一方向の長さの比を０．６以下とし、かつ、前記固定子鉄心と前記巻線の間を絶縁する絶縁部材に体積抵抗率が１×１０ １４ Ωｍ以上の材料を用いるとともに絶縁部材の体積抵抗を１×１０８Ω以上としている。
【００１２】
請求項２の発明は、請求項１の発明において、固定子鉄心断面における前記絶縁部材の厚さと、固定子鉄心と絶縁部材との接触部分の長さの比を７×１０−４ 以上としている。
【００１４】
請求項３の発明は、請求項１及び２のいずれかの発明において、絶縁部材に樹脂成形材を用いた構成としている。
【００１６】
請求項４の発明は、請求項１〜３のいずれかの発明に係る圧縮機用電動機を搭載して冷媒を圧縮する圧縮機であって、圧縮する冷媒にＨＦＣ系冷媒を用いた構成としている。
【００１７】
上述した構成により、請求項１の発明によれば、容易に固定子鉄心の回転軸軸方向と同一方向の長さに対するコイルエンドの回転軸軸方向と同一方向の長さの比を０．６以下にでき、また、少ない絶縁部材で巻線に付着した潤滑油や冷媒を介して流れる漏洩電流及び絶縁部材を介して固定子鉄心に流れる漏洩電流を小さく出来る。
【００１８】
請求項２の発明によれば、請求項１の発明に加えて、絶縁部材を介して固定子鉄心に流れる漏洩電流をより小さく出来る。
【００２０】
請求項３の発明によれば、請求項１及び２の発明に加えて、容易に体積抵抗率を１×１０１４Ωｍ以上とすることができる。
【００２２】
請求項４の発明によれば、ＨＣＦＣ冷媒に対して漏洩電流が大きくなる傾向のあるＨＦＣ冷媒を用いても、本発明に係る圧縮機用電動機の構成により、漏洩電流の増加を防止することができる。
【００２３】
【発明の実施の形態】
以下、本発明の実施の形態につき、図面を参照して詳細に説明する。まず、本発明に係る電動機の第１の実施の形態について説明する。
【００２４】
尚、本実施の形態は空気調和機等に用いられる圧縮機に適用したもので、圧縮機の構成は図１に示したものと同様であるため、同一の部分についてはその図示及び説明を省略する。
【００２５】
図２に本実施の形態に係る電動機部２に用いられる固定子５の組立図を示す。また、図３に図２中のＡ−Ａ線における断面図を示す。また、図４に図３の一部拡大図を示す。また、図５に固定子５の上面図を示す。
【００２６】
固定子５は内周部に沿って複数の磁極歯１２が所定間隔を在して放射状に設置される環状の固定子鉄心６と、この鉄心の磁極歯１２に絶縁部材７を介して巻装される巻線８とから形成されている。
【００２７】
コイルエンド部９と固定子鉄心６の回転軸と同一方向の長さをそれぞれｈとｔとすると、その比（ｈ／ｔ）が０．６以下となるように形成する。
尚、ｈはコイルエンド部９の全ての長さ（コイルエンド９１の長さｈ１とコイルエンド９２の長さｈ２の合計）である。
【００２８】
図６にｈ／ｔと漏洩電流の関係を示す。ｈ／ｔが大きい範囲においては、コイルエンド部９の占める割合が多いため、巻線８に付着した潤滑油または冷媒を通りケース１０に流れる量が多くなる。逆にｈ／ｔが小さくなるほど漏洩電流が少なくなる。なお、ｈ／ｔが０．６以下では、漏洩電流は略一定である。
【００２９】
また、図７にｈ／ｔを０．５とした場合の絶縁部材７の体積抵抗と漏洩電流の関係を示す。図７より、絶縁部材７の体積抵抗を１×１０８Ω以上に設計すると漏洩電流を小さくできることがわかる。また、この傾向はｈ／ｔが０．６以下の範囲において同様の傾向を示す。
【００３０】
よって、ｈ／ｔが０．６以下の範囲においてさらに漏洩電流を低減できるように絶縁材８の体積抵抗を１×１０８Ω以上に設計する。
【００３１】
次に本発明に係る圧縮機の第２の実施の形態について説明する。
図４に示すように、固定子鉄心６のＡ−Ａ断面における絶縁材７の厚さをＷ、固定子鉄心６と絶縁部材７の接触部分の長さをＬとする。ここで、接触部分の長さＬは、絶縁材が複数ある場合は全接触部分の合計の長さ（Ｌ＝Ｌ１＋Ｌ２＋Ｌ３＋・・・＋Ｌｎ）を意味する。
【００３２】
図８にＷ／Ｌと漏洩電流の関係を示す。図８よりＷ／Ｌが７×１０−４以上となったところから漏洩電流の低減の割合が大きくなっていることがわかる。
【００３３】
また、この図８においては、ｈ／ｔが０．５の場合であるが、図８における傾向は、ｈ／ｔが０．６以下の範囲においても同様である。
よって、ＷとＬの比（Ｗ／Ｌ）が７×１０−４以上となるように形成する。
【００３４】
次に本発明に係る圧縮機の第３の実施の形態について説明する。
図９に体積抵抗率と漏洩電流の関係を示す。図９より体積抵抗率が１×１０１４Ωｍ以上となったところから漏洩電流の低減の割合が大きくなっていることがわかる。
また、この図９においては、ｈ／ｔが０．５の場合であるが、図９における傾向は、ｈ／ｔが０．６以下の範囲においても同様である。
よって、絶縁材８の体積抵抗率を１×１０１４Ωｍ以上に設計することにより、少ない絶縁材料で漏洩電流の低減が計れる。
【００３５】
また、本発明の実施の形態では、絶縁材８に樹脂成形材を用いたが、樹脂成形材としては、ポリフェニレンサルファイド（ＰＰＳ）、ナイロン（ＰＡ）、ポリブチレンラレフタード（ＰＢＴ）や液晶ポリマー（ＬＣＤ）等が挙げられる。これらの材料を絶縁材８に用いることによって、体積抵抗率を１×１０１４Ωｍ以上として形成することができる。
【００３６】
さらに上記第１ないし第３の実施の形態においては、ＨＣＦＣ冷媒に対して漏洩電流が大きくなる傾向のあるＨＦＣ冷媒を用いても、本発明に係る圧縮機用電動機の構成により、漏洩電流の増加を防止することができる。
【００３７】
尚、ＨＣＦＣ系冷媒を用いた場合でも漏洩電流の低減効果はＨＦＣ系冷媒を用いたときと同様に得られる。
【００３８】
また、本発明では、圧縮機構にロータリタイプのものを備えた圧縮機を説明したが、これに限らず、例えばスクロールタイプのものを備えた圧縮機でもよい。
【００３９】
【発明の効果】
以上説明したように、本発明によれば、電動機の効率を低下させることなく、電動機運転中に、巻線に付着した潤滑油や冷媒を介して圧縮機ケースに流れる漏洩電流や、絶縁部材を介して固定子鉄心に流れる漏洩電流を低減できる。
【図面の簡単な説明】
【図１】本発明に係る圧縮機の断面図。
【図２】本発明に係る圧縮機用電動機の固定子の組立図。
【図３】図２中のＡ−Ａ線における断面図。
【図４】図３の一部拡大図
【図５】第１の実施の形態に係る固定子の上面図。
【図６】ｈ／ｔと漏洩電流の関係を示すグラフ。
【図７】ｈ／ｔを０．５とした場合の絶縁部材の体積抵抗と漏洩電流の関係を示すグラフ。
【図８】Ｗ／Ｌと漏洩電流の関係を示すグラフ。
【図９】体積効率と漏洩電流の関係を示すグラフ。
【図１０】従来の固定子の組立図。
【図１１】図１０中のＡ−Ａ線における断面図。
【図１２】図１１の一部拡大図。
【符号の説明】
１…圧縮機
２…電動機部
１１…圧縮部
３…回転軸
４…回転子
５…固定子
１２…磁極歯
６…固定子鉄心
７…絶縁部材
８…巻線
９…コイルエンド部
９１、９２…コイルエンド[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor for a compressor incorporated in a compressor mounted on an air conditioner or the like, and more particularly to a structure of a stator of the electric motor.
[0002]
[Prior art]
As shown in FIG. 1, the compressor 1 mounted on the air conditioner includes an electric motor unit 2 and a compression unit 11.
The electric motor unit 2 includes a rotor 4 that is integrally attached to the rotating shaft 3 and a stator 5 that is disposed with a small gap from the outer peripheral surface of the rotor 4.
[0003]
FIG. 10 shows an assembly drawing of a conventional stator. FIG. 11 is a cross-sectional view taken along line AA in FIG. FIG. 12 is a partially enlarged view of FIG.
As shown in FIG. 11, the stator 5 is formed by fitting an insulating member 7 on a stator core 6 in which electromagnetic steel plates are laminated, and winding a winding 8 thereon.
[0004]
In the stator 5, a coil end 91 and a coil formed by extending the length 8 in the same direction as the axial direction of the rotating shaft 3 of the stator core 6 and similarly extending the winding 8 to the upper end and the lower end of the stator 5. When the length of the coil end portion 9 composed of the end 92 is h, the ratio (h / t) between the coil end portion 9 and the stator core 6 is larger than 0.6.
Here, h is the length of all the coil end portions (the sum of the length h1 of the coil end 91 and the length h2 of the coil end 92).
[0005]
In general, a polyester film was used for the insulating member 7 and its volume resistance was less than 1 × 10 8 Ω.
[0006]
And when the said motor 2 drives, the electric current which flows through the coil | winding 8 passed the following two paths | routes, and became a leakage current.
1) Flows through the lubricating oil or refrigerant adhering to the winding 8 to the compressor case 10.
2) Flows through the stator core 6 through the insulating material 7 between the stator core 6 and the winding 8.
[0007]
In such a conventional configuration, since the ratio of the coil end portion 9 is large, the lubricating oil and refrigerant adhering to the winding 8 are also large, and the current flowing through the winding is likely to leak. Further, since the volume resistance of the material used for the insulating member 7 is small, the insulation is incomplete, and the material leaks to the stator core 6.
[0008]
[Problems to be solved by the invention]
In the conventional configuration described above, a measure has been taken to reduce the winding diameter in order to reduce the leakage current.
[0009]
However, the measures to reduce the diameter of the winding have problems such as increased copper loss and reduced motor efficiency.
[0010]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an efficient compressor motor and compressor that reduce leakage current.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is directed to an annular stator core in which a plurality of magnetic pole teeth are radially arranged along the inner peripheral portion at a predetermined interval, and the magnetic pole teeth of the stator core The windings of the stator consisting of the windings wound around the insulation member are concentrated windings, and the upper and lower ends of the stator with respect to the length in the same direction as the rotation axis direction of the stator core The ratio of the length of the coil end formed by extending the winding in the same direction as the direction of the rotation axis is 0.6 or less, and the volume of the insulating member that insulates between the stator core and the winding. A material having a resistivity of 1 × 10 14 Ωm or more is used, and a volume resistance of the insulating member is set to 1 × 10 8 Ω or more.
[0012]
According to a second aspect of the present invention, in the first aspect of the invention, the ratio of the thickness of the insulating member in the cross section of the stator core to the length of the contact portion between the stator core and the insulating member is 7 × 10 −4 or more . .
[0014]
According to a third aspect of the present invention, in any one of the first and second aspects, a resin molding material is used for the insulating member.
[0016]
Invention of Claim 4 is a compressor which mounts the motor for compressors which concerns on any one of Claims 1-3 , and compresses a refrigerant | coolant, Comprising: It is set as the structure which used the HFC type refrigerant | coolant for the refrigerant | coolant to compress. .
[0017]
With the configuration described above, according to the first aspect of the present invention, the ratio of the length in the same direction as the rotation axis direction of the coil end to the length in the same direction as the rotation axis direction of the stator core is easily set to 0.6. In addition, the leakage current flowing through the lubricating oil or refrigerant attached to the winding with a small number of insulating members and the leakage current flowing through the stator core through the insulating members can be reduced.
[0018]
According to the invention of claim 2, in addition to the invention of claim 1, the leakage current flowing through the stator core via the insulating member can be further reduced.
[0020]
According to the invention of claim 3 , in addition to the inventions of claims 1 and 2, the volume resistivity can be easily set to 1 × 10 14 Ωm or more.
[0022]
According to the invention of claim 4 , even if an HFC refrigerant that tends to have a large leakage current with respect to the HCFC refrigerant is used, an increase in the leakage current can be prevented by the configuration of the compressor motor according to the present invention. it can.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, a first embodiment of an electric motor according to the present invention will be described.
[0024]
The present embodiment is applied to a compressor used in an air conditioner or the like, and the configuration of the compressor is the same as that shown in FIG. 1, and therefore, illustration and description of the same parts are omitted. To do.
[0025]
FIG. 2 shows an assembly diagram of the stator 5 used in the electric motor unit 2 according to the present embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a partially enlarged view of FIG. FIG. 5 shows a top view of the stator 5.
[0026]
The stator 5 is an annular stator core 6 in which a plurality of magnetic pole teeth 12 are radially arranged along the inner peripheral portion at a predetermined interval, and the magnetic pole teeth 12 of the iron core are wound around an insulating member 7. And the winding 8 to be formed.
[0027]
When the lengths in the same direction as the rotation axes of the coil end portion 9 and the stator core 6 are h and t, respectively, the ratio (h / t) is 0.6 or less.
Note that h is the total length of the coil end portion 9 (the sum of the length h1 of the coil end 91 and the length h2 of the coil end 92).
[0028]
FIG. 6 shows the relationship between h / t and leakage current. In the range where h / t is large, since the ratio of the coil end portion 9 is large, the amount flowing through the case 10 through the lubricating oil or refrigerant adhering to the winding 8 increases. Conversely, as h / t decreases, the leakage current decreases. Note that when h / t is 0.6 or less, the leakage current is substantially constant.
[0029]
FIG. 7 shows the relationship between the volume resistance of the insulating member 7 and the leakage current when h / t is 0.5. FIG. 7 shows that the leakage current can be reduced when the volume resistance of the insulating member 7 is designed to be 1 × 10 8 Ω or more. Moreover, this tendency shows the same tendency in the range where h / t is 0.6 or less.
[0030]
Therefore, the volume resistance of the insulating material 8 is designed to be 1 × 10 8 Ω or more so that the leakage current can be further reduced in the range where h / t is 0.6 or less.
[0031]
Next, a second embodiment of the compressor according to the present invention will be described.
As shown in FIG. 4, the thickness of the insulating material 7 in the section AA of the stator core 6 is W, and the length of the contact portion between the stator core 6 and the insulating member 7 is L. Here, the length L of the contact portion means the total length of all the contact portions (L = L 1 + L 2 + L 3 +... + L n ) when there are a plurality of insulating materials.
[0032]
FIG. 8 shows the relationship between W / L and leakage current. It can be seen from FIG. 8 that the rate of reduction of leakage current increases from the point where W / L is 7 × 10 −4 or more.
[0033]
In FIG. 8, h / t is 0.5, but the tendency in FIG. 8 is the same even when h / t is 0.6 or less.
Therefore, it is formed so that the ratio of W to L (W / L) is 7 × 10 −4 or more.
[0034]
Next, a third embodiment of the compressor according to the present invention will be described.
FIG. 9 shows the relationship between volume resistivity and leakage current. From FIG. 9, it can be seen that the rate of reduction of leakage current is increased from the point where the volume resistivity is 1 × 10 14 Ωm or more.
In FIG. 9 , h / t is 0.5, but the tendency in FIG. 9 is the same even when h / t is 0.6 or less.
Therefore, the leakage current can be reduced with a small amount of insulating material by designing the volume resistivity of the insulating material 8 to 1 × 10 14 Ωm or more.
[0035]
Further, in the embodiment of the present invention, a resin molding material is used for the insulating material 8, but as the resin molding material, polyphenylene sulfide (PPS), nylon (PA), polybutylene raftade (PBT), and liquid crystal polymer are used. (LCD). By using these materials for the insulating material 8, the volume resistivity can be set to 1 × 10 14 Ωm or more.
[0036]
Furthermore, in the first to third embodiments, even if an HFC refrigerant that tends to have a large leakage current with respect to the HCFC refrigerant is used, the increase in the leakage current is achieved by the configuration of the compressor motor according to the present invention. Can be prevented.
[0037]
Even when the HCFC refrigerant is used, the effect of reducing the leakage current can be obtained in the same manner as when the HFC refrigerant is used.
[0038]
Further, in the present invention, the compressor having a rotary type compressor has been described. However, the present invention is not limited to this, and for example, a compressor having a scroll type may be used.
[0039]
【The invention's effect】
As described above, according to the present invention, the leakage current flowing through the compressor case and the insulating member through the lubricating oil and refrigerant attached to the windings can be reduced during operation of the motor without reducing the efficiency of the motor. The leakage current flowing through the stator core can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a compressor according to the present invention.
FIG. 2 is an assembly drawing of a stator of an electric motor for a compressor according to the present invention.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a partially enlarged view of FIG. 3. FIG. 5 is a top view of the stator according to the first embodiment.
FIG. 6 is a graph showing the relationship between h / t and leakage current.
FIG. 7 is a graph showing the relationship between the volume resistance of the insulating member and the leakage current when h / t is 0.5.
FIG. 8 is a graph showing the relationship between W / L and leakage current.
FIG. 9 is a graph showing the relationship between volumetric efficiency and leakage current.
FIG. 10 is an assembly diagram of a conventional stator.
11 is a cross-sectional view taken along line AA in FIG.
12 is a partially enlarged view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Electric motor part 11 ... Compression part 3 ... Rotating shaft 4 ... Rotor 5 ... Stator 12 ... Magnetic pole tooth 6 ... Stator core 7 ... Insulation member 8 ... Winding 9 ... Coil end part 91, 92 ... Coil end
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25581899A JP3761749B2 (en) | 1999-09-09 | 1999-09-09 | Compressor motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25581899A JP3761749B2 (en) | 1999-09-09 | 1999-09-09 | Compressor motor and compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001082335A JP2001082335A (en) | 2001-03-27 |
| JP3761749B2 true JP3761749B2 (en) | 2006-03-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25581899A Expired - Lifetime JP3761749B2 (en) | 1999-09-09 | 1999-09-09 | Compressor motor and compressor |
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| Country | Link |
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| JP (1) | JP3761749B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4019786B2 (en) * | 2002-05-08 | 2007-12-12 | ダイキン工業株式会社 | DC motor winding method |
| JP2010057211A (en) * | 2008-08-26 | 2010-03-11 | Nippon Densan Corp | Motor |
| JP2012139069A (en) * | 2010-12-27 | 2012-07-19 | Mitsubishi Electric Corp | Sealed compressor |
| JP6582236B2 (en) * | 2015-06-11 | 2019-10-02 | パナソニックＩｐマネジメント株式会社 | Refrigeration cycle equipment |
-
1999
- 1999-09-09 JP JP25581899A patent/JP3761749B2/en not_active Expired - Lifetime
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| JP2001082335A (en) | 2001-03-27 |
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