JP2016507210A - Configuration of DC plastic packing motor - Google Patents

Configuration of DC plastic packing motor Download PDF

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JP2016507210A
JP2016507210A JP2015556365A JP2015556365A JP2016507210A JP 2016507210 A JP2016507210 A JP 2016507210A JP 2015556365 A JP2015556365 A JP 2015556365A JP 2015556365 A JP2015556365 A JP 2015556365A JP 2016507210 A JP2016507210 A JP 2016507210A
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end cover
plastic packing
bearing
package
attached
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JP6113866B2 (en
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潘明攀
黄廷▲帥▼
丁小勇
金建▲偉▼
▲趙▼勇
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中山大洋▲電▼机股▲ふん▼有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

【課題】 設計簡単、合理であり、便利に製造でき、効果的に軸電流を低くし、電食を少なくし、ボール軸受の耐用期間を長くし、モータの故障と騒音を削減する。【解決手段】 フロントエンドカバー、リアエンドカバー、プラスチックパッキン固定子パッケージ、回転子パッケージ、前軸受及び後軸受を含み、前記のプラスチックパッキン固定子パッケージが固定子コア、固定子巻線及びプラスチックパッキン・シェルを含み、プラスチックパッキン固定子パッケージの中央にキャビティが形成し、フロントエンドカバーが絶縁プラスチック製であり、フロントエンドカバーがプラスチックパッキン・シェルの一端に嵌めつけられ、フロントエンドカバーの前軸受室に前軸受が取り付けられ、リアエンドカバーが金属製であり、リアエンドカバーがプラスチックパッキン・シェルの他端に取り付けられ、リアエンドカバー内の後軸受室の内壁面に絶縁層が敷かられ、後軸受が後軸受室に取り付けられ、絶縁層が後軸受とリアエンドカバーを隔離して絶縁させ、回転子パッケージがキャビティに設置され、回転子パッケージ上の回転軸が前軸受及び後軸受に取り付けられ、支持される直流プラスチックパッキン・モータの構成。【選択図】図６PROBLEM TO BE SOLVED: To easily design, rationally and conveniently manufacture, effectively reduce shaft current, reduce electric corrosion, extend the life of a ball bearing, reduce motor failure and noise. SOLUTION: A front end cover, a rear end cover, a plastic packing stator package, a rotor package, a front bearing and a rear bearing, wherein the plastic packing stator package includes a stator core, a stator winding and a plastic packing shell. A cavity is formed in the center of the plastic packing stator package, the front end cover is made of insulating plastic, the front end cover is fitted to one end of the plastic packing shell, and the front end cover is in front of the front bearing chamber. The bearing is attached, the rear end cover is made of metal, the rear end cover is attached to the other end of the plastic packing shell, the insulating layer is laid on the inner wall surface of the rear bearing chamber in the rear end cover, and the rear bearing is in the rear bearing chamber Attached to The edge layer isolates and insulates the rear bearing and the rear end cover, the rotor package is installed in the cavity, the rotating shaft on the rotor package is attached to the front bearing and the rear bearing, and the supported DC plastic packing motor Constitution. [Selection] Figure 6

Description

本発明は直流プラスチックパッキン・モータの構成に関する。   The present invention relates to a structure of a direct current plastic packing motor.

従来、空調用プラスチックパッキン直流モータは耐用期間が短く、主な故障がボール軸受の電食に集まり、主な表現として次に挙げられる。1）プラスチックパッキン直流モータがPWM信号で制御られ、電圧高速で切り替え、軸受の内外リングの間に軸電圧が発生するので、軸受の潤滑油に絶縁破壊が発生し、軸電流を引き起こすので、軸受の内・外リング波状の摩耗が発生し、異音につながる。2）電食の原因が電流放電にあり、直流プラスチックパッキン・モータエンドカバーと固定子コアとの間に絶縁材料があり、完全に絶縁される。高周波変調電圧が固定子の巻線を通過する場合、連成効果により金属エンドカバーの間に電圧差が形成し、電流が回転軸、軸受に応じるエンドカバーを通じて回路を構成し、電流がボールと軸受の内・外リングの間でオイルフィルムを破壊して放電して高温が発生し、軸受の局部に溶融して斑点やピットが出てきて、摩耗の速度を早くし、騒音が発生し、耐用期間が短くなる。   Conventionally, air-conditioning plastic packing DC motors have a short service life, and major failures are concentrated in the electric corrosion of ball bearings. 1) Plastic packing DC motor is controlled by PWM signal, switching at high speed, and shaft voltage is generated between the inner and outer rings of the bearing, causing dielectric breakdown in the bearing lubricant and causing shaft current. Inner / outer ring wavy wear occurs, leading to abnormal noise. 2) The cause of electrolytic corrosion is current discharge, and there is an insulating material between the DC plastic packing / motor end cover and the stator core, and it is completely insulated. When high-frequency modulation voltage passes through the stator winding, a voltage difference is formed between the metal end covers due to the coupling effect, and the current forms a circuit through the end cover corresponding to the rotating shaft and bearing, and the current is The oil film is destroyed and discharged between the inner and outer rings of the bearing, causing a high temperature, melting in the local part of the bearing, causing spots and pits, increasing the speed of wear, generating noise, The service life is shortened.

本発明は目的が直流プラスチックパッキン・モータの構成を提供することにある。設計が簡単、合理であり、便利に製造でき、効果的に軸電流を低くし、電食を少なくし、ボール軸受の耐用期間を長くし、モータの故障と騒音を削減することができる。   An object of the present invention is to provide a structure of a DC plastic packing motor. Design is simple, reasonable and convenient to manufacture, can effectively reduce shaft current, reduce electric corrosion, extend the life of ball bearings, and reduce motor failure and noise.

本発明は、フロントエンドカバー、リアエンドカバー、プラスチックパッキン固定子パッケージ、回転子パッケージ、前軸受及び後軸受を含み、前記のプラスチックパッキン固定子パッケージが固定子コア、固定子巻線及びプラスチックパッキン・シェルを含み、プラスチックパッキン固定子パッケージの中央にキャビティが形成し、フロントエンドカバーが非磁性材料製であり、フロントエンドカバーがプラスチックパッキン・シェルの一端に嵌めつけられ、 フロントエンドカバーの前軸受室に前軸受が取り付けられ、 リアエンドカバーが金属製であり、リアエンドカバーがプラスチックパッキン・シェルの他端に取り付けられ、 リアエンドカバー内の後軸受室の内壁面に絶縁層が敷かられ、後軸受が後軸受室に取り付けられ、絶縁層が後軸受とリアエンドカバーを隔離して絶縁させ、回転子パッケージがキャビティに設置され、回転子パッケージ上の回転軸が前軸受及び後軸受に取り付けられ、支持されることを特徴とする直流プラスチックパッキン・モータの構成である。   The present invention includes a front end cover, a rear end cover, a plastic packing stator package, a rotor package, a front bearing, and a rear bearing, and the plastic packing stator package includes a stator core, a stator winding, and a plastic packing shell. A cavity is formed in the center of the plastic packing stator package, the front end cover is made of a non-magnetic material, and the front end cover is fitted to one end of the plastic packing shell. The front bearing is attached, the rear end cover is made of metal, the rear end cover is attached to the other end of the plastic packing shell, the insulating layer is laid on the inner wall surface of the rear bearing chamber in the rear end cover, and the rear bearing is the rear bearing. Attached to the chamber and the insulation layer DC plastic packing motor characterized in that the bearing and rear end cover are isolated and insulated, the rotor package is installed in the cavity, and the rotating shaft on the rotor package is attached to and supported by the front and rear bearings It is the composition.

前記のリアエンドカバーがSPCCスチールプレス部品又はキャストアルミニウム部品である。   The rear end cover is an SPCC steel press part or a cast aluminum part.

前記の絶縁層が高強度のプラスチック製である。   The insulating layer is made of high strength plastic.

前記のフロントエンドカバーがプラスチックパッキン・シェルと注射成形で一体となり、フロントエンドカバーがプラスチックパッキン・シェルに包まれる。   The front end cover is integrated with the plastic packing shell by injection molding, and the front end cover is wrapped in the plastic packing shell.

前記の回転子パッケージが永久磁石であり、外コア、内コア及び回転軸を含み、回転軸が内コアに取り付けられ、外コアと内コアが絶縁緩衝ベルトに連結させられ、永久磁石が外コアに取り付けられる。   The rotor package is a permanent magnet, includes an outer core, an inner core, and a rotating shaft, the rotating shaft is attached to the inner core, the outer core and the inner core are connected to an insulating buffer belt, and the permanent magnet is the outer core. Attached to.

前記のフロントエンドカバーが絶縁プラスチック素材又はPPSプラスチック製である。   The front end cover is made of an insulating plastic material or PPS plastic.

従来の技術により、本発明は次の効果がある。   According to the conventional technique, the present invention has the following effects.

1）フロントエンドカバーは絶縁プラスチックなどの非磁性材料製であり、前軸受と絶縁し、リアエンドカバーは金属製であり、加工精度及び前後軸受の同心度が確保され、 リアエンドカバー内の後軸受室の内壁面に絶縁層が敷かられ、後軸受が後軸受室に取り付けられ、絶縁層が後軸受とリアエンドカバーを隔離して絶縁させるので、連成効果を低くし、フロントエンドカバーと前軸受、リアエンドカバーと後軸受の電流通路を切断できる。この設計は簡単、合理であり、便利に製造でき、効果的に軸電流を低くし、電食を少なくし、ボール軸受の耐用期間を長くし、モータの故障と騒音を削減することができる。2）回転子パッケージが永久磁石であり、外コア、内コア及び回転軸を含み、回転軸が内コアに取り付けられ、外コアと内コアが絶縁緩衝ベルトに連結させられ、永久磁石が外コアに取り付けられるので、効果的に回転子パッケージによる軸電流や電食を削減できる。3）リアエンドカバー内の後軸受室の内壁面に絶縁層が敷かられ、絶縁層が高強度のプラスチック製であり、リアエンドカバーがSPCCスチールプレス部品又はキャストアルミニウム部品であるので、部品の製造精度、前軸受及び後軸受の同心度が保証され、構成簡単であり、便利に製造できる。4）前記のフロントエンドカバーがプラスチックパッキン・シェルと注射成形で一体となり、フロントエンドカバーがプラスチックパッキン・シェルに包まれたので、フロントエンドカバーの構成強度が向上する。   1) The front end cover is made of non-magnetic material such as insulating plastic, insulated from the front bearing, and the rear end cover is made of metal, ensuring machining accuracy and concentricity of the front and rear bearings, and the rear bearing chamber in the rear end cover Insulating layer is laid on the inner wall surface, the rear bearing is attached to the rear bearing chamber, and the insulating layer isolates and insulates the rear bearing and the rear end cover, so that the coupling effect is lowered, the front end cover and the front bearing, The current path between the rear end cover and the rear bearing can be cut. This design is simple, reasonable and convenient to manufacture, can effectively lower shaft current, reduce electric corrosion, extend the life of ball bearings, and reduce motor failure and noise. 2) The rotor package is a permanent magnet and includes an outer core, an inner core and a rotating shaft. The rotating shaft is attached to the inner core, the outer core and the inner core are connected to an insulating buffer belt, and the permanent magnet is the outer core. As a result, the shaft current and electric corrosion caused by the rotor package can be effectively reduced. 3) Since the insulating layer is laid on the inner wall surface of the rear bearing chamber in the rear end cover, the insulating layer is made of high-strength plastic, and the rear end cover is made of SPCC steel press parts or cast aluminum parts, The concentricity of the front bearing and the rear bearing is guaranteed, the structure is simple, and it can be manufactured conveniently. 4) Since the front end cover is integrated with the plastic packing shell by injection molding and the front end cover is wrapped in the plastic packing shell, the structural strength of the front end cover is improved.

本発明の立体図Three-dimensional view of the present invention 本発明の分解図1Exploded view 1 of the present invention 本発明の分解図2Exploded view 2 of the present invention 本発明の正面図Front view of the present invention 図4のA-A断面図A-A cross section of Fig. 4 本発明のプラスチックパッキン・シェルの裏の構成原理図Configuration principle diagram behind the plastic packing shell of the present invention

次に、具体的な実施例と図により本発明について詳細に説明する。   Next, the present invention will be described in detail with reference to specific examples and drawings.

図1〜6の通りに、一種直流プラスチックパッキン・モータの構成、フロントエンドカバー3、リアエンドカバー4、プラスチックパッキン固定子パッケージ1、回転子パッケージ2、前軸受5及び後軸受6を含み、前記のプラスチックパッキン固定子パッケージ1が固定子コア12、固定子巻線13及びプラスチックパッキン・シェル11を含み、プラスチックパッキン固定子パッケージの中心1にキャビティ14が形成し、フロントエンドカバー3が非磁性材料製であり、絶縁プラスチック製でも塑料PPS製でもよく、フロントエンドカバー3がプラスチックパッキン・シェル11の一端に嵌めつけられ、フロントエンドカバー3の前軸受室31に前軸受5が取り付けられ、 リアエンドカバー4が金属製であり、リアエンドカバー4がプラスチックパッキン・シェル11の他端に取り付けられ、リアエンドカバー4内の後軸受室41の内壁面に絶縁層42が敷かられ、後軸受6が後軸受室41に取り付けられ、絶縁層42が後軸受6とリアエンドカバー4を隔離して絶縁させ、回転子パッケージ2がキャビティ14に設置され、回転子パッケージ2上の回転軸21が前軸受5及び後軸受6に取り付けられ、支持され、リアエンドカバー4がSPCCスチールプレス部品又はキャストアルミニウム部品である。前記の絶縁層42は高強度のプラスチック製であり、フロントエンドカバー3はプラスチックパッキン・シェル11と注射成形で一体となり、プラスチックパッキン・シェル11はフロントエンドカバー3を包む。前記の回転子パッケージ2は永久磁石22、外コア24、内コア23及び回転軸21を含む。回転軸21は内コア23に取り付けられ、外コア24と内コア23は絶縁緩衝ベルト25により連結され、永久磁石22は外コア24に取り付けられる。   As shown in FIGS. 1 to 6, a kind of DC plastic packing motor configuration, including front end cover 3, rear end cover 4, plastic packing stator package 1, rotor package 2, front bearing 5 and rear bearing 6, The plastic packing stator package 1 includes a stator core 12, a stator winding 13, and a plastic packing shell 11. A cavity 14 is formed in the center 1 of the plastic packing stator package, and the front end cover 3 is made of a nonmagnetic material. The front end cover 3 is fitted to one end of the plastic packing shell 11 and the front bearing 5 is attached to the front bearing chamber 31 of the front end cover 3, and the rear end cover 4 Is made of metal, and the rear end cover 4 is attached to the other end of the plastic packing shell 11. An insulating layer 42 is laid on the inner wall surface of the rear bearing chamber 41 in the rear end cover 4, the rear bearing 6 is attached to the rear bearing chamber 41, and the insulating layer 42 isolates the rear bearing 6 and the rear end cover 4 from each other. Insulated, rotor package 2 is installed in cavity 14, rotating shaft 21 on rotor package 2 is mounted and supported on front bearing 5 and rear bearing 6, and rear end cover 4 is SPCC steel press part or cast aluminum part It is. The insulating layer 42 is made of high-strength plastic, and the front end cover 3 is integrated with the plastic packing shell 11 by injection molding, and the plastic packing shell 11 wraps the front end cover 3. The rotor package 2 includes a permanent magnet 22, an outer core 24, an inner core 23, and a rotating shaft 21. The rotating shaft 21 is attached to the inner core 23, the outer core 24 and the inner core 23 are connected by an insulating buffer belt 25, and the permanent magnet 22 is attached to the outer core 24.

本発明の原理として、フロントエンドカバー3が絶縁プラスチック製であり、フロントエンドカバー3が前軸受5と絶縁し、リアエンドカバー4が金属製であり、加工精度及び前後軸受の同心度が確保され、リアエンドカバー4内の後軸受室41の内壁面に絶縁層42が敷かられ、後軸受6が後軸受室41に取り付けられ、絶縁層42が後軸受6とリアエンドカバー4を隔離して絶縁させるので、連成効果を低くし、フロントエンドカバーと前軸受、リアエンドカバーと後軸受の電流通路を切断できる。この設計は簡単、合理であり、便利に製造でき、効果的に軸電流を低くし、電食を少なくし、ボール軸受の耐用期間を長くし、モータの故障と騒音を削減することができる。回転子パッケージ2の外コア24及び内コア23が絶縁緩衝ベルト25により連結され、永久磁石22が外コア24に取り付けられ、効果的に回転子パッケージによる軸電流及び電食を削減できる。   As a principle of the present invention, the front end cover 3 is made of insulating plastic, the front end cover 3 is insulated from the front bearing 5, and the rear end cover 4 is made of metal, so that machining accuracy and concentricity of the front and rear bearings are ensured. Since an insulating layer 42 is laid on the inner wall surface of the rear bearing chamber 41 in the rear end cover 4, the rear bearing 6 is attached to the rear bearing chamber 41, and the insulating layer 42 insulates and insulates the rear bearing 6 and the rear end cover 4 from each other. This reduces the coupling effect and cuts the current path between the front end cover and the front bearing, and the rear end cover and the rear bearing. This design is simple, reasonable and convenient to manufacture, can effectively lower shaft current, reduce electric corrosion, extend the life of ball bearings, and reduce motor failure and noise. The outer core 24 and the inner core 23 of the rotor package 2 are connected by an insulating buffer belt 25, and the permanent magnet 22 is attached to the outer core 24, so that axial current and electric corrosion caused by the rotor package can be effectively reduced.

１・・・プラスチックパッキン固定子パッケージ
２・・・固定子パッケージ
３・・・フロントエンドカバー
４・・・リアエンドカバー
５・・・前軸受
６・・・後軸受
１１・・・プラスチックパッキン・シェル
１２・・・固定子コア
１３・・・固定子巻線
１４・・・キャビティ
２１・・・回転軸
２２・・・永久磁石
２３・・・内コア
２４・・・外コア
２５・・・絶縁緩衝ベルト
３１・・・前軸受室
４１・・・後軸受室
４２・・・絶縁層 DESCRIPTION OF SYMBOLS 1 ... Plastic packing stator package 2 ... Stator package 3 ... Front end cover 4 ... Rear end cover 5 ... Front bearing 6 ... Rear bearing 11 ... Plastic packing shell 12 ... Stator core 13 ... Stator winding 14 ... Cavity 21 ... Rotating shaft 22 ... Permanent magnet 23 ... Inner core 24 ... Outer core 25 ... Insulation buffer belt 31 ... Front bearing chamber 41 ... Rear bearing chamber 42 ... Insulating layer

Claims (7)

フロントエンドカバー、リアエンドカバー、プラスチックパッキン固定子パッケージ、回転子パッケージ、前軸受及び後軸受を含み、
前記のプラスチックパッキン固定子パッケージが固定子コア、固定子巻線及びプラスチックパッキン・シェルを含み、プラスチックパッキン固定子パッケージの中央にキャビティが形成し、
フロントエンドカバーが非磁性材料製であり、フロントエンドカバーがプラスチックパッキン・シェルの一端に嵌めつけられ、
フロントエンドカバーの前軸受室に前軸受が取り付けられ、
リアエンドカバーが金属製であり、
リアエンドカバーがプラスチックパッキン・シェルの他端に取り付けられ、 リアエンドカバー内の後軸受室の内壁面に絶縁層が敷かられ、
後軸受が後軸受室に取り付けられ、
絶縁層が後軸受とリアエンドカバーを隔離して絶縁させ、
回転子パッケージがキャビティに設置され、回転子パッケージ上の回転軸が前軸受及び後軸受に取り付けられ、支持されることを特徴とする直流プラスチックパッキン・モータの構成。 Including front end cover, rear end cover, plastic packing stator package, rotor package, front bearing and rear bearing,
The plastic packing stator package includes a stator core, a stator winding and a plastic packing shell, and a cavity is formed in the center of the plastic packing stator package;
The front end cover is made of non-magnetic material, the front end cover is fitted to one end of the plastic packing shell,
A front bearing is installed in the front bearing chamber of the front end cover,
The rear end cover is made of metal,
A rear end cover is attached to the other end of the plastic packing shell, an insulating layer is laid on the inner wall surface of the rear bearing chamber in the rear end cover,
The rear bearing is mounted in the rear bearing chamber,
An insulating layer isolates the rear bearing and rear end cover and insulates them.
A structure of a direct current plastic packing motor, wherein a rotor package is installed in a cavity, and a rotating shaft on the rotor package is attached to and supported by a front bearing and a rear bearing. リアエンドカバーがSPCCスチールプレス部品又はキャストアルミニウム部品であることを特徴とする請求項1に記載の直流プラスチックパッキン・モータの構成。   2. The structure of a direct current plastic packing motor according to claim 1, wherein the rear end cover is an SPCC steel press part or a cast aluminum part. 前記の絶縁層が高強度のプラスチック製のものであることを特徴とする請求項1又は2に記載の直流プラスチックパッキン・モータの構成。   3. The structure of the direct current plastic packing motor according to claim 1, wherein the insulating layer is made of high-strength plastic. フロントエンドカバーがプラスチックパッキン・シェルと注射成形で一体となることを特徴とする請求項3に記載の直流プラスチックパッキン・モータの構成。   4. The structure of the direct current plastic packing motor according to claim 3, wherein the front end cover is integrated with the plastic packing shell by injection molding. 前記の回転子パッケージが永久磁石であり、外コア、内コア及び回転軸を含み、回転軸が内コアに取り付けられ、外コアと内コアが絶縁緩衝ベルトに連結させられ、永久磁石が外コアに取り付けられることを特徴とする請求項4に記載の直流プラスチックパッキン・モータの構成。   The rotor package is a permanent magnet, includes an outer core, an inner core, and a rotating shaft, the rotating shaft is attached to the inner core, the outer core and the inner core are connected to an insulating buffer belt, and the permanent magnet is the outer core. 5. The structure of the direct current plastic packing motor according to claim 4, wherein the direct current plastic packing motor is attached to the motor. フロントエンドカバーがプラスチックパッキン・シェルに包まれたことを特徴とする請求項4に記載の直流プラスチックパッキン・モータの構成。   5. The structure of a direct current plastic packing motor according to claim 4, wherein the front end cover is wrapped in a plastic packing shell. フロントエンドカバーが絶縁プラスチック製又はPPSプラスチック製であることを特徴とする請求項1又は2に記載の直流プラスチックパッキン・モータの構成。   3. The structure of a direct current plastic packing motor according to claim 1, wherein the front end cover is made of insulating plastic or PPS plastic.
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