JP2010075011A - Stator for motor, motor, and compressor - Google Patents

Stator for motor, motor, and compressor Download PDF

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Publication number
JP2010075011A
JP2010075011A JP2008242753A JP2008242753A JP2010075011A JP 2010075011 A JP2010075011 A JP 2010075011A JP 2008242753 A JP2008242753 A JP 2008242753A JP 2008242753 A JP2008242753 A JP 2008242753A JP 2010075011 A JP2010075011 A JP 2010075011A
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Prior art keywords
stator
fixing member
stator core
electric motor
core
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JP5042178B2 (en
Inventor
Koji Yabe
浩二 矢部
Isato Yoshino
勇人 吉野
Kazuhiko Baba
和彦 馬場
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for a motor capable of reducing a magnetic flux flowing through a fixing member by an air hole for a stator core and capable of decreasing an iron loss generated in the fixing member, and to provide a motor and a compressor. <P>SOLUTION: In the stator 100 for the motor, the stator core 1 is fixed in the cylindrical fixing member 5 composed of a magnetic substance. In the stator 100 for the motor, the stator core 1 includes: notches 4 formed with a predetermined length in the peripheral direction at a plurality of positions of an outer periphery to form spaces 6 between the notches 4 and the fixing member 5; and the air holes 8 so formed on core backs 7 among the notches 4 as to penetrate in the axial direction. In the stator 100 for the motor, contactless portions 10 communicated with the spaces 6, extended to the air hole 8 sides clockwise or counterclockwise from the spaces 6 and formed to reach the air holes 8 outside in the radial direction of the air holes 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、電動機の固定子に関する。詳しくは、電動機の固定子外の切欠以外に、電動機の固定子外周と電動機の固定子を収容する固定部材との間に空隙を設けて高効率化を図ったものである。また、その電動機の固定子を用いた電動機及び圧縮機に関する。   The present invention relates to a stator for an electric motor. Specifically, in addition to the notch outside the stator of the motor, a high efficiency is achieved by providing a gap between the outer periphery of the stator of the motor and the fixing member that houses the stator of the motor. The present invention also relates to an electric motor and a compressor using the stator of the electric motor.

従来、円筒状の固定部材と、前記固定部材の内面に接触する円弧状に形成された接触面と前記固定部材の内面に接触しないようほぼ平面状に切り欠いた非接触面とを外周に設け該接触面を前記固定部材に嵌合して固定した固定子とを備え、前記固定部材の内部において前記固定子の軸方向に流体を通過する通路部が形成された圧縮機用電動機において、前記固定子の全ての前記非接触面側において流体を通過し得る軸方向に形成された第１の前記通路部と、前記固定子の全ての前記接触面側において流体を通過し得る軸方向に形成された第２の前記通路部を備え、前記第１の通路部は前記固定部材の半径方向より周方向の距離が長い断面形状であり、前記第２の通路部はスロット歯の外部延長線上に形成され且つ円形の断面形状であり、前記第１及び第２の通路部の各々は固定子の中心に対する最短距離部分が該中心に対し同一円周上に沿って配置されていることを特徴とする圧縮機用電動機が提案されている（例えば、特許文献１参照）。
特公平７−３２５４８号公報 Conventionally, a cylindrical fixing member, an arc-shaped contact surface that contacts the inner surface of the fixing member, and a non-contact surface that is cut out in a substantially flat shape so as not to contact the inner surface of the fixing member are provided on the outer periphery. A compressor electric motor including a stator that is fixed by fitting the contact surface to the fixing member, wherein a passage portion that passes fluid in an axial direction of the stator is formed inside the fixing member. The first passage portion formed in an axial direction capable of passing a fluid on all the non-contact surface sides of the stator and formed in an axial direction capable of passing a fluid on all the contact surface sides of the stator. The first passage portion has a cross-sectional shape that is longer in the circumferential direction than the radial direction of the fixing member, and the second passage portion is on the external extension line of the slot tooth. Formed and circular cross-sectional shape, Each of the first and second passage portions has a compressor motor characterized in that the shortest distance portion with respect to the center of the stator is arranged along the same circumference with respect to the center (for example, , See Patent Document 1).
Japanese Patent Publication No. 7-32548

しかしながら、上記特許文献１に記載された固定子の流体が通過する通路部であっても、磁束は通路部を回り込むように磁路を形成する。固定子を保持するための固定部材が磁性体の時、磁束は通路部を回り込むように磁路を形成するため、固定部材にも磁束が流れることになる。固定子は、一般的に鉄損を低減するため、電磁鋼板のような固定子鉄心板を複数枚積層して構成するが、固定部材は、電磁鋼板に比べ鉄損が大きい材料が使用される。そのため、通路部により固定部材に磁束が流れることにより、固定部材の鉄損が固定子に磁束が流れる場合の鉄損より大きくなり、電動機の効率が低下する課題があった。   However, even in the passage portion through which the stator fluid described in Patent Document 1 passes, the magnetic flux forms a magnetic path so as to go around the passage portion. When the fixing member for holding the stator is a magnetic material, a magnetic path is formed so that the magnetic flux goes around the passage portion, so that the magnetic flux also flows through the fixing member. In general, the stator is configured by stacking a plurality of stator core plates such as electromagnetic steel sheets in order to reduce iron loss. However, the stator member is made of a material having a larger iron loss than the electromagnetic steel sheets. . Therefore, when the magnetic flux flows through the fixing member through the passage portion, the iron loss of the fixing member becomes larger than the iron loss when the magnetic flux flows through the stator, and there is a problem that the efficiency of the electric motor is reduced.

上記特許文献１で使用されている「通路部」に対し、この明細書では「風穴」を用いる。   In this specification, “air holes” are used in contrast to the “passage portion” used in Patent Document 1.

この発明は、上記のような課題を解決するためになされたもので、固定子鉄心の風穴により固定部材に流れてしまう磁束を低減させ、固定部材に発生する鉄損を低減できる電動機の固定子及び電動機及び圧縮機を提供することを目的とする。   The present invention has been made to solve the above-described problems, and reduces the magnetic flux that flows to the fixing member due to the air holes in the stator core, thereby reducing the iron loss generated in the fixing member. And it aims at providing an electric motor and a compressor.

この発明に係る電動機の固定子は、磁性体で構成される円筒状の固定部材の内部に固定子鉄心が固定される電動機の固定子であって、
前記固定子鉄心は、
外周部の複数箇所に周方向に所定の長さで形成され、前記固定部材との間に空間を形成する切欠き部と、
前記切欠き部同士の間のコアバックに設けられ、軸方向に貫通する風穴とを備え、
前記空間に連通し、該空間から時計方向又は反時計方向に前記風穴側に延び、前記風穴の径方向外側で該風穴まで達するように形成される非接触部を設けたことを特徴とする。 The stator of the electric motor according to the present invention is an electric motor stator in which a stator iron core is fixed inside a cylindrical fixing member made of a magnetic material,
The stator core is
A notch portion that is formed in a predetermined length in the circumferential direction at a plurality of locations on the outer peripheral portion, and forms a space between the fixing member,
Provided in the core back between the notches, provided with an air hole penetrating in the axial direction,
A non-contact portion is provided which communicates with the space and extends from the space in the clockwise or counterclockwise direction toward the air hole and reaches the air hole on the radially outer side of the air hole.

この発明に係る電動機の固定子鉄心は、固定部材と切欠き部との間に形成される空間に連通し、空間から時計方向又は反時計方向に風穴側に延び、風穴の径方向外側で風穴まで達するように形成される非接触部を設けたことにより、固定部材に磁束が流れにくくなり、固定部材の鉄損が低下し、電動機の高効率化が図れる。   The stator core of the electric motor according to the present invention communicates with a space formed between the fixing member and the notch, extends from the space to the air hole side in the clockwise direction or the counterclockwise direction, and the air hole on the radially outer side of the air hole By providing the non-contact portion formed so as to reach up to, the magnetic flux hardly flows through the fixing member, the iron loss of the fixing member is reduced, and the efficiency of the electric motor can be increased.

実施の形態１．
図１は比較のために示す一般的な電動機の固定子１００を示す平面図である。図１により、一般的な電動機の固定子１００について説明する。電動機の固定子１００は、略ドーナッツ状の固定子鉄心１と、この固定子鉄心１の内径側に沿って複数形成されるスロット２（空間）に絶縁部材（図示せず）を介して施される巻線（図示せず）とを備える。但し、電動機の固定子１００は、固定部材５の内部に固定されている。固定部材５は、電動機ではフレームに相当する。また、圧縮機では、密閉容器に相当するものである。 Embodiment 1 FIG.
FIG. 1 is a plan view showing a stator 100 of a general electric motor shown for comparison. A general electric motor stator 100 will be described with reference to FIG. The stator 100 of the electric motor is applied to a substantially donut-shaped stator core 1 and a plurality of slots 2 (spaces) formed along the inner diameter side of the stator core 1 via insulating members (not shown). Windings (not shown). However, the stator 100 of the electric motor is fixed inside the fixing member 5. The fixing member 5 corresponds to a frame in the electric motor. In the compressor, it corresponds to a sealed container.

固定子鉄心１は、所定の形状に打ち抜かれた厚さ０．１〜１．０ｍｍ程度の薄い電磁鋼板を積層し、カシメ・溶接等により固定して製作される。   The stator core 1 is manufactured by laminating thin electromagnetic steel plates having a thickness of about 0.1 to 1.0 mm punched into a predetermined shape and fixing them by caulking, welding, or the like.

固定子鉄心１の内径側に沿って複数形成されるスロット２は、周方向に略等間隔に配置される。図１の例では、スロット２の数は１８個である。但し、スロット２の数は、任意でよい。   A plurality of slots 2 formed along the inner diameter side of the stator core 1 are arranged at substantially equal intervals in the circumferential direction. In the example of FIG. 1, the number of slots 2 is 18. However, the number of slots 2 may be arbitrary.

隣接するスロット２の間の鉄心部分を、磁束が通る磁路の一部を構成するティース３と呼ぶ。例えば、ティース３の周方向の幅Ｗｔは、径方向に略一定になっている。従って、スロット２の周方向の幅Ｗｓは、内周から外周に向って徐々に大きくなる。但し、ティース３の周方向の幅Ｗｔは、径方向に略一定でなくてもよい。   An iron core portion between adjacent slots 2 is called a tooth 3 constituting a part of a magnetic path through which a magnetic flux passes. For example, the circumferential width Wt of the teeth 3 is substantially constant in the radial direction. Therefore, the circumferential width Ws of the slot 2 gradually increases from the inner periphery toward the outer periphery. However, the circumferential width Wt of the teeth 3 may not be substantially constant in the radial direction.

固定子鉄心１は、略ドーナッツ状の形状である。内周部も外周部と同様、断面が円形状になっている。但し、外周部には断面が一つの直線からなる切欠き部４が存在する。   The stator core 1 has a substantially donut shape. Similarly to the outer peripheral portion, the inner peripheral portion has a circular cross section. However, a cutout portion 4 whose cross section is a straight line exists on the outer peripheral portion.

切欠き部４は、固定子鉄心１を打ち抜く電磁鋼板（フープ材）の幅を小さくして、材料取りを向上さる。また、固定子鉄心１と固定部材５（円筒状）との間に空間６を作り、この空間６を電動機の固定子１００の冷却のための流路として利用する。   The notch 4 reduces the width of the electromagnetic steel plate (hoop material) that punches out the stator core 1 and improves material removal. Further, a space 6 is formed between the stator core 1 and the fixing member 5 (cylindrical shape), and this space 6 is used as a flow path for cooling the stator 100 of the electric motor.

切欠き部４は、複数の直線を組み合わせた形状や、一部に円弧形状が存在する形状でもよい。   The cutout portion 4 may have a shape in which a plurality of straight lines are combined or a shape in which an arc shape exists in part.

スロット２は、内周側が開口している。この開口している部分を、通常スロット開口部２ａ（又はスロットオープニング）と呼ぶ。スロット開口部２ａがあるため、固定子鉄心１の内周は、不連続な円である。スロット開口部２ａは、スロット２内に巻線を納めるために必要である。巻線を納めるためには、スロット開口部２ａの周方向の長さは大きい方がよい。但し、スロット開口部２ａが広くなると、電動機の固定子１００と回転子（図示せず）との間に形成される空隙（実質的な）が大きくなる、或いは磁気回路が滑らかにならないという不具合が生じる。そのため、スロット開口部２ａは、巻線が可能な範囲で極力小さく設計される。   The slot 2 is open on the inner peripheral side. This open portion is generally called a slot opening 2a (or slot opening). Because of the slot opening 2a, the inner periphery of the stator core 1 is a discontinuous circle. The slot opening 2 a is necessary for accommodating the winding in the slot 2. In order to accommodate the winding, the circumferential length of the slot opening 2a is preferably large. However, when the slot opening 2a is widened, there is a problem that a gap (substantially) formed between the stator 100 and the rotor (not shown) of the motor becomes large or the magnetic circuit is not smooth. Arise. Therefore, the slot opening 2a is designed to be as small as possible within the range in which winding is possible.

スロット２と固定子鉄心１の外周部との間は、ティース２と同様、磁束の通る磁路の一部を構成するコアバック７である。   A space between the slot 2 and the outer periphery of the stator core 1 is a core back 7 that constitutes a part of a magnetic path through which a magnetic flux passes, like the tooth 2.

コアバック７には、電動機の固定子１００の冷却と、流体（空気、冷媒等）の流路確保のため、風穴８を設けている。図１の例では、４個の風穴８が周方向に略等間隔に配置されている。   The core back 7 is provided with air holes 8 for cooling the stator 100 of the electric motor and securing a flow path of fluid (air, refrigerant, etc.). In the example of FIG. 1, four air holes 8 are arranged at substantially equal intervals in the circumferential direction.

しかしながら、風穴８の部分の内部は空間であるから、透磁率が低く磁束が通りにくいため、コアバック７を通る磁束の磁路を狭める課題が生じる。   However, since the inside of the portion of the air hole 8 is a space, the magnetic permeability is low and it is difficult for the magnetic flux to pass through, so that a problem arises of narrowing the magnetic path of the magnetic flux passing through the core back 7.

固定部材５に磁性体を用いる場合、図１の矢印で示すように、コアバック７を通る磁束が風穴８があるため、固定部材５の方に回り込み、固定部材５の部分も磁路となる。   When a magnetic body is used for the fixing member 5, as indicated by an arrow in FIG. 1, since the magnetic flux passing through the core back 7 has the air holes 8, the magnetic flux goes around the fixing member 5, and the portion of the fixing member 5 also becomes a magnetic path. .

固定部材５に磁性体を用いる場合、鉄損が大きい材料である一般的な鉄を使用することが多い。また、固定部材５は固定子鉄心１のように薄板を積層したものではない。従って、固定部材５に磁束が流れると電磁鋼板に比べ大きな鉄損が発生する。そのため、鉄損が増加し、効率が低下する課題があった。   When a magnetic material is used for the fixing member 5, general iron that is a material having a large iron loss is often used. Further, the fixing member 5 is not a laminate of thin plates like the stator core 1. Therefore, when a magnetic flux flows through the fixing member 5, a large iron loss is generated as compared with the electromagnetic steel sheet. For this reason, there is a problem that iron loss increases and efficiency decreases.

この課題を解決する方法として、固定子鉄心１を、風穴８により固定部材５の方に回り込む磁束が固定部材５を通りにくい構造にすることが考えられる。それにより、固定部材５に流れる磁束が小さくなり、固定部材５の鉄損が低下し、電動機の高効率化が可能である。   As a method for solving this problem, it is conceivable that the stator core 1 has a structure in which the magnetic flux that goes around the fixing member 5 through the air holes 8 does not easily pass through the fixing member 5. Thereby, the magnetic flux which flows into the fixing member 5 becomes small, the iron loss of the fixing member 5 falls, and the high efficiency of an electric motor is possible.

図２乃至図５は実施の形態１を示す図で、図２は固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図、図３は固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図、図４は変形例の固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図、図５は変形例の固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図である。   2 to 5 show the first embodiment. FIG. 2 is a plan view of a stator 100 of an electric motor provided with a non-contact portion 10 on the stator core 1 side, and FIG. 3 is non-contact on the fixing member 5 side. 4 is a plan view of the stator 100 of the motor provided with the portion 10, FIG. 4 is a plan view of the stator 100 of the motor provided with the non-contact portion 10 on the stator core 1 side of the modification, and FIG. 5 is a fixing member of the modification. It is a top view of the stator 100 of the electric motor which provided the non-contact part 10 in 5 side.

図２により実施の形態１の電動機の固定子１００について説明する。電動機の固定子１００は、略ドーナッツ状の固定子鉄心１と、この固定子鉄心１の内径側に沿って複数形成されるスロット２（空間）に絶縁部材（図示せず）を介して施される巻線（図示せず）とを備える。但し、電動機の固定子１００は、固定部材５の内部に固定されている。固定部材５は、電動機ではフレームに相当する。また、圧縮機では、密閉容器に相当するものである。   The stator 100 of the electric motor according to the first embodiment will be described with reference to FIG. The stator 100 of the electric motor is applied to a substantially donut-shaped stator core 1 and a plurality of slots 2 (spaces) formed along the inner diameter side of the stator core 1 via insulating members (not shown). Windings (not shown). However, the stator 100 of the electric motor is fixed inside the fixing member 5. The fixing member 5 corresponds to a frame in the electric motor. In the compressor, it corresponds to a sealed container.

図２に示すように、固定子鉄心１外周には、磁性体で形成される固定部材５が配置される。固定部材５は、例えば、厚さが数ミリ程度の鋼板で構成される。   As shown in FIG. 2, a fixing member 5 made of a magnetic material is disposed on the outer periphery of the stator core 1. The fixing member 5 is made of, for example, a steel plate having a thickness of about several millimeters.

固定子鉄心１は、所定の形状に打ち抜かれた厚さ０．１〜１．０ｍｍ程度の薄い電磁鋼板を積層し、カシメ・溶接等により固定して製作される。   The stator core 1 is manufactured by laminating thin electromagnetic steel plates having a thickness of about 0.1 to 1.0 mm punched into a predetermined shape and fixing them by caulking, welding, or the like.

また、固定子鉄心１は、略ドーナッツ状の形状である。内周部も外周部と同様、断面が円形状になっている。但し、例えば、外周部には断面が一つの直線からなる切欠き部４が、周方向に略等間隔に４個存在する。但し、切欠き部４は、一つの直線からなるものや、周方向に略等間隔に配置されるものに限定されない。   The stator core 1 has a substantially donut shape. Similarly to the outer peripheral portion, the inner peripheral portion has a circular cross section. However, for example, there are four notches 4 having a straight section in the outer circumferential portion at substantially equal intervals in the circumferential direction. However, the notch part 4 is not limited to what consists of one straight line, or what is arrange | positioned in the circumferential direction at substantially equal intervals.

固定子鉄心１の内周側に沿って複数形成されるスロット２は、周方向に略等間隔に配置される。図２の例では、スロット２の数は１８個である。但し、スロット２の数は、任意でよい。   A plurality of slots 2 formed along the inner peripheral side of the stator core 1 are arranged at substantially equal intervals in the circumferential direction. In the example of FIG. 2, the number of slots 2 is 18. However, the number of slots 2 may be arbitrary.

スロット２は、内周側がスロット開口部２ａで開口している。スロット開口部２ａは、巻線が可能な範囲で極力小さく設計される。   The slot 2 is opened on the inner peripheral side by a slot opening 2a. The slot opening 2a is designed to be as small as possible within a range in which winding is possible.

固定子鉄心１の外周部とスロット２との間は、ティース２とともに磁束の通る磁路の一部を構成するコアバック７である。   Between the outer peripheral part of the stator core 1 and the slot 2 is a core back 7 that constitutes a part of a magnetic path along which the magnetic flux passes with the teeth 2.

コアバック７には、外周部に切欠き部４が存在しない部分（径方向の長さが、外周部に切欠き部４が存在する部分に比べて長い部分）に、風穴８が設けられる。風穴８は、電動機の固定子１００の冷却と、流体（空気、冷媒等）の流路確保のために設けられる。図２の例では、風穴８の数は４個である。   The core back 7 is provided with an air hole 8 in a portion where the cutout portion 4 does not exist in the outer peripheral portion (a portion whose radial length is longer than a portion where the cutout portion 4 exists in the outer peripheral portion). The air hole 8 is provided for cooling the stator 100 of the electric motor and securing a flow path of fluid (air, refrigerant, etc.). In the example of FIG. 2, the number of the air holes 8 is four.

本実施の形態の特徴は、固定子鉄心１を、風穴８が存在するため固定部材５の方に回り込む磁束が固定部材５を通りにくい構造にする点にある。   The feature of the present embodiment is that the stator core 1 has a structure in which the magnetic flux that goes around the fixing member 5 hardly passes through the fixing member 5 because the air holes 8 exist.

本実施の形態では、固定子鉄心１の外周部に形成されている断面が一つの直線からなる切欠き部４と固定部材５との間に形成される空間６と連通する非接触部１０（空間）を、風穴８が存在するコアバック７の外周部に設ける。風穴８の外側に非接触部１０を設ける。   In the present embodiment, the non-contact portion 10 (the non-contact portion 10 (the cross section formed on the outer peripheral portion of the stator core 1) communicates with the space 6 formed between the notch portion 4 and the fixing member 5 formed of one straight line. Space) is provided on the outer periphery of the core back 7 where the air holes 8 exist. A non-contact portion 10 is provided outside the air hole 8.

非接触部１０は、固定子鉄心１の外周部の切欠き部４が存在しない円弧部分の一部の径を他の円弧部分の径よりも小さくすることで形成する。この他の円弧部分の径よりも小さい箇所を、外径小部９と呼ぶ。   The non-contact part 10 is formed by making the diameter of a part of the arc part where the notch part 4 of the outer peripheral part of the stator core 1 does not exist smaller than the diameter of the other arc part. A portion smaller than the diameter of the other arc portion is referred to as a small outer diameter portion 9.

固定子鉄心１のパンチング（打ち抜き板）を外径小部９が形成される形状にし、それらを積層することにより、固定部材５の内部に固定した場合に、軸方向に貫通する非接触部１０が形成される。   The non-contact portion 10 that penetrates in the axial direction when the stator core 1 is punched (punched plate) into a shape in which the small outer diameter portion 9 is formed and stacked inside the fixing member 5 by stacking them. Is formed.

図２の例では、矢印で磁束の流れを示している部分付近の非接触部１０は、空間６から反時計方向に風穴８側に延び、風穴８を通りすぎる所まで、形成されている。   In the example of FIG. 2, the non-contact portion 10 in the vicinity of the portion where the flow of magnetic flux is indicated by an arrow extends from the space 6 to the air hole 8 side in the counterclockwise direction and is formed to a place passing through the air hole 8.

非接触部１０の径方向の寸法は、磁束が固定部材５に流れないようにするには、できるだけ大きい方がよい。しかし、非接触部１０の径方向の寸法が大きいと、コアバック７の径方向の磁路幅が小さくなって、電動機の効率が悪化する。そこで、非接触部１０の径方向の寸法は、０．１〜３ｍｍ程度（所定の径方向寸法）とする。   The dimension of the non-contact portion 10 in the radial direction is preferably as large as possible so that the magnetic flux does not flow to the fixed member 5. However, if the dimension in the radial direction of the non-contact portion 10 is large, the magnetic path width in the radial direction of the core back 7 becomes small, and the efficiency of the electric motor deteriorates. Therefore, the dimension in the radial direction of the non-contact portion 10 is about 0.1 to 3 mm (predetermined radial dimension).

固定子鉄心１の外周部に形成されている断面が一つの直線からなる切欠き部４と隣り合う切欠き部４との間に風穴８が存在する時、風穴８の部分の内部は空間であるから、透磁率が低く磁束が通りにくくなり、コアバック７を通る磁束の磁路を狭める課題が生じる。固定部材５が磁性体の場合は、図１の矢印で示すように、コアバック７を通る磁束が風穴８があるため、固定部材５の方に回り込み、固定部材５の部分も磁路となるが、図２に示すように、空間６から反時計方向に風穴８側に延び、風穴８を通りすぎる所まで形成されている非接触部１０（図２の矢印付近の）を設けることにより、磁束が固定部材５の方に回り込むのを抑制することができる。   When the air hole 8 exists between the notch part 4 in which the cross section formed on the outer peripheral part of the stator core 1 is a straight line and the adjacent notch part 4, the inside of the part of the air hole 8 is a space. Therefore, the magnetic permeability is low and the magnetic flux is difficult to pass, and there arises a problem of narrowing the magnetic path of the magnetic flux passing through the core back 7. When the fixing member 5 is a magnetic body, as indicated by an arrow in FIG. 1, the magnetic flux passing through the core back 7 has the air holes 8, so that the fixing member 5 turns around the fixing member 5 and the portion of the fixing member 5 also becomes a magnetic path. However, as shown in FIG. 2, by providing a non-contact portion 10 (near the arrow in FIG. 2) extending from the space 6 in the counterclockwise direction toward the air hole 8 and passing through the air hole 8, It is possible to suppress the magnetic flux from going around the fixing member 5.

図２の矢印付近の非接触部１０の左右対称（図２において）の位置にある非接触部１０は、空間６から時計方向に風穴８側に延び、風穴８を通りすぎる所まで形成されている。   The non-contact part 10 located in the left-right symmetrical position (in FIG. 2) of the non-contact part 10 near the arrow in FIG. 2 extends from the space 6 to the air hole 8 side in the clockwise direction and is formed to pass through the air hole 8. Yes.

また、図２の例では、非接触部１０は４箇所に存在するが、同図において、４箇所の非接触部１０は、左右対称且つ上下対称である。   Moreover, in the example of FIG. 2, the non-contact part 10 exists in four places, but in the same figure, the four non-contact parts 10 are left-right symmetric and vertically symmetrical.

固定子鉄心１の外周部に形成されている断面が一つの直線からなる切欠き部４と固定部材５との間の空間６と連結する非接触部１０を、風穴８が存在するコアバック７の外周部に設けることにより、その部分においてはコアバック７の外周部と固定部材５との間に所定の径方向寸法の隙間が存在するので、コアバック７の風穴８の外側に向かう磁束は、図２の矢印で示すように固定部材５には流れにくい。コアバック７の風穴８の外側に向かう磁束は、非接触部１０と風穴８との間を通る。その結果、固定部材５の鉄損が図１の一般的な電動機の固定子１００よりも低減し、電動機の高効率化が可能となる。   A core back 7 in which a non-contact portion 10 connected to a space 6 between a notch portion 4 and a fixing member 5 having a cross section formed on one outer periphery of the stator core 1 is formed in a core back 7. Since a gap with a predetermined radial dimension exists between the outer peripheral portion of the core back 7 and the fixing member 5 at that portion, the magnetic flux toward the outside of the air hole 8 of the core back 7 is As shown by the arrows in FIG. 2, it is difficult for the fixing member 5 to flow. The magnetic flux toward the outside of the air hole 8 of the core back 7 passes between the non-contact portion 10 and the air hole 8. As a result, the iron loss of the fixing member 5 is lower than that of the general electric motor stator 100 shown in FIG. 1, and the efficiency of the electric motor can be increased.

コアバック７の磁路は、スロット２の径方向外側に存在するコアバックの磁路幅（径方向）よりも、ティース３の径方向の延長線上に存在するコアバックの磁路幅（径方向）が大きい。そのため、風穴８はティース３の径方向の延長線上に存在するほうがよい。   The magnetic path of the core back 7 has a magnetic path width (radial direction) of the core back existing on the extension line in the radial direction of the tooth 3 rather than the magnetic path width (radial direction) of the core back existing outside the slot 2 in the radial direction. ) Is large. Therefore, the air holes 8 are preferably present on the extension line in the radial direction of the teeth 3.

本実施の形態でも、図２に示すように、各風穴８をティース３の径方向の延長線上に設けている。   Also in this embodiment, as shown in FIG. 2, each air hole 8 is provided on an extension line in the radial direction of the tooth 3.

そのため、固定子鉄心１の外周部で、切欠き部４の間に存在する外周部が円弧部分のコアバック７にある風穴８は、その外周部が円弧部分のコアバック７の中央部ではなく、中央部から時計方向又は反時計方向にずれて配置されている。   Therefore, in the outer peripheral portion of the stator core 1, the air hole 8 in which the outer peripheral portion existing between the cutout portions 4 is in the core back 7 of the arc portion is not the central portion of the core back 7 of the arc portion. In this case, they are arranged to be shifted clockwise or counterclockwise from the central portion.

例えば、図２の左上隅の風穴８は、外周部が円弧部分のコアバック７の中央部から時計方向にずれて配置されている。   For example, the air hole 8 in the upper left corner of FIG. 2 is arranged such that the outer peripheral portion is shifted in the clockwise direction from the central portion of the core back 7 of the arc portion.

また、図２の右上隅の風穴８は、外周部が円弧部分のコアバック７の中央部から反時計方向にずれて配置されている。その他の箇所は、上下対称である。   Further, the air hole 8 in the upper right corner of FIG. 2 is arranged such that the outer peripheral portion is shifted counterclockwise from the central portion of the core back 7 of the arc portion. Other portions are vertically symmetrical.

空間６と連結する非接触部１０を、風穴８の両側にある空間６のどちらから延ばすのがよいかということに関しては、風穴８から近い方の空間６から形成するのが好ましい。何故ならば、空間６と連結する非接触部１０を、風穴８から近い方の空間６から形成する方が、風穴８から遠い方の空間６から形成するのに比べ、非接触部１０の周方向長さを短くできる。非接触部１０の周方向長さが短くなれば、外径小部９を設けることにより径方向の磁路幅が狭くなるコアバック７の周方向の長さも短くなり、外径小部９によるコアバック７の磁路幅減少への影響を小さくすることが可能となる。   With respect to which of the spaces 6 on both sides of the air hole 8 should be extended, the non-contact portion 10 connected to the space 6 is preferably formed from the space 6 closer to the air hole 8. This is because the non-contact portion 10 connected to the space 6 is formed from the space 6 closer to the air hole 8 than the space 6 far from the air hole 8 compared to the periphery of the non-contact portion 10. The direction length can be shortened. When the circumferential length of the non-contact portion 10 is shortened, the circumferential length of the core back 7 is reduced by providing the small outer diameter portion 9 and the radial magnetic path width is narrowed. It is possible to reduce the influence of the core back 7 on the magnetic path width reduction.

また、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成する方法として、図２に示すような固定子鉄心１の外周部の円弧部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法以外に、例えば、図３に示すように、固定部材５の内径の一部を固定子鉄心１外径より大きい内径大部５ａとし、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成するようにしてもよい。さらに、図示はしないが、固定子鉄心１と固定部材５との両方の形状を変更することで非接触部１０を形成してもよい。   Further, as a method of forming the non-contact portion 10 between the outer peripheral portion of the stator core 1 and the fixing member 5, a part of the arc portion of the outer peripheral portion of the stator core 1 as shown in FIG. For example, as shown in FIG. 3, a part of the inner diameter of the fixing member 5 is a large inner diameter portion 5 a larger than the outer diameter of the stator core 1. A non-contact portion 10 may be formed between the outer peripheral portion of the core 1 and the fixing member 5. Furthermore, although not shown, the non-contact portion 10 may be formed by changing the shapes of both the stator core 1 and the fixing member 5.

上記のいずれの方法でも、コアバック７の風穴８の外側に向かう磁束を、固定部材５に流れにくいようにすることができる。   Any of the above methods can make it difficult for the magnetic flux toward the outside of the air hole 8 of the core back 7 to flow to the fixing member 5.

図３の固定部材５の内径の一部を固定子鉄心１の外径より大きい形状の内径大部５ａとする方法は、固定子鉄心１のコアバック７の径方向幅が狭くならないので、コアバック７の磁路を確保する点では好ましい。但し、固定部材５の作りやすさから言えば、図２の固定子鉄心１の外周部の円弧部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法の方が好ましい。   In the method in which a part of the inner diameter of the fixing member 5 in FIG. 3 is larger than the outer diameter of the stator core 1, the inner diameter large portion 5a does not reduce the radial width of the core back 7 of the stator core 1. This is preferable in terms of securing the magnetic path of the back 7. However, in terms of ease of making the fixing member 5, the method in which a part of the circular arc portion of the outer peripheral portion of the stator core 1 in FIG. Is preferred.

また、固定子鉄心１の外径小部９又は固定部材５の内径大部５ａを直線形状とすると、径方向幅の大きい部分ができ、コアバック７の磁路の幅が狭くなる箇所ができる。そのため、固定子鉄心１の外径小部９又は固定部材５の内径大部５ａを円弧形状にて構成し、空隙部分の幅が略一定になるようにすることにより、部分的にコアバック７の磁路の幅が狭くなる箇所ができるのを抑制することができる。   Moreover, when the outer diameter small portion 9 of the stator core 1 or the inner diameter large portion 5a of the fixing member 5 is linear, a portion having a large radial width is formed, and a portion where the width of the magnetic path of the core back 7 is narrowed is formed. . Therefore, the core back 7 is partially provided by configuring the small outer diameter portion 9 of the stator core 1 or the large inner diameter portion 5a of the fixing member 5 in an arc shape so that the width of the gap portion is substantially constant. It can suppress that the location where the width | variety of this magnetic path becomes narrow is formed.

また、固定子鉄心１と固定部材５との非接触部１０は、対応する風穴８の一部の
外側に構成しても効果を示すことは可能である。 Further, even if the non-contact portion 10 between the stator core 1 and the fixing member 5 is configured outside a part of the corresponding air hole 8, the effect can be exhibited.

また、切欠き部４が存在するコアバック７部分は、他のコアバック７部分よりも磁路幅が狭く、磁束密度が高いため、切欠き部４が存在するコアバック７部分に風穴８を設けると、磁束密度が高くなり効率が低下するため、切欠き部４が存在するコアバック７部分には風穴８は設けないほうがよい。   In addition, the core back 7 portion where the notch 4 is present has a narrower magnetic path width and higher magnetic flux density than the other core back 7 portions, so that the air hole 8 is provided in the core back 7 portion where the notch 4 exists. If provided, the magnetic flux density is increased and the efficiency is lowered. Therefore, it is better not to provide the air hole 8 in the core back 7 portion where the notch 4 is present.

図４は変形例の電動機の固定子１００の平面図であり、隣り合う切欠き部４同士の間に風穴８が二つ存在する形状である。   FIG. 4 is a plan view of the stator 100 of the electric motor according to the modification, and has a shape in which two air holes 8 exist between the adjacent notch portions 4.

隣り合う切欠き部４同士の間に風穴８が二つ存在する場合、夫々の切欠き部４と固定部材５との間の空間６から、時計方向又は反時計方向に風穴８側に延び、風穴８を通りすぎる所まで夫々非接触部１０を形成するようにしても同様の効果が得られる。   When there are two air holes 8 between the adjacent notches 4, the air holes 8 extend from the space 6 between each notch 4 and the fixing member 5 toward the air holes 8 in the clockwise direction or the counterclockwise direction. The same effect can be obtained even if the non-contact portions 10 are formed so as to pass through the air holes 8 respectively.

また、別の表現をすると、隣り合う切欠き部４同士の間に存在する二つの風穴８の外側の、固定子鉄心１の中心を通る夫々の接線のなす角度をθ３、固定子鉄心１の外周部の固定部材５と接触する接触部１１の角度をθ４とした時、接触部１１は角度θ３内に配置され、且つθ４＜θ３とする。   In other words, the angle formed by each tangent line passing through the center of the stator core 1 outside the two air holes 8 existing between the adjacent notch portions 4 is θ3, and the stator core 1 When the angle of the contact portion 11 that contacts the outer peripheral fixing member 5 is θ4, the contact portion 11 is disposed within the angle θ3 and θ4 <θ3.

このように構成することにより、コアバック７の風穴８の外側に向かう磁束は、固定部材５に流れにくくすることができる。それにより、電動機の高効率化が可能となる。   By configuring in this way, the magnetic flux toward the outside of the air hole 8 of the core back 7 can be made difficult to flow to the fixing member 5. As a result, the efficiency of the electric motor can be increased.

また、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成する方法として、図４に示すような固定子鉄心１の外周部の円弧部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法以外に、例えば、図５に示すように、固定部材５の内径の一部を固定子鉄心１外径より大きい内径大部５ａとし、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成するようにしてもよい。さらに、図示はしないが、固定子鉄心１と固定部材５とお両方の形状を変更することで非接触部１０を形成してもよい。   Further, as a method of forming the non-contact portion 10 between the outer periphery of the stator core 1 and the fixing member 5, a part of the arc portion of the outer periphery of the stator core 1 as shown in FIG. For example, as shown in FIG. 5, a part of the inner diameter of the fixing member 5 is a large inner diameter portion 5 a larger than the outer diameter of the stator core 1. A non-contact portion 10 may be formed between the outer peripheral portion of the core 1 and the fixing member 5. Furthermore, although not illustrated, the non-contact portion 10 may be formed by changing the shapes of both the stator core 1 and the fixing member 5.

上記のいずれの方法でも、コアバック７の風穴８の外側に向かう磁束を、固定部材５に流れにくいようにすることができる。   Any of the above methods can make it difficult for the magnetic flux toward the outside of the air hole 8 of the core back 7 to flow to the fixing member 5.

図５の固定部材５の内径の一部を固定子鉄心１の外径より大きい形状の内径大部５ａとする方法は、固定子鉄心１のコアバック７の径方向幅が狭くならないので、コアバック７の磁路を確保する点では好ましい。但し、固定部材５の作りやすさから言えば、図４の固定子鉄心１の外周部の円弧部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法の方が好ましい。   In the method in which a part of the inner diameter of the fixing member 5 in FIG. 5 is a larger inner diameter portion 5a having a shape larger than the outer diameter of the stator core 1, the radial width of the core back 7 of the stator core 1 is not reduced. This is preferable in terms of securing the magnetic path of the back 7. However, in terms of ease of making the fixing member 5, the method in which a part of the arc portion of the outer peripheral portion of the stator core 1 in FIG. 4 is changed to a small outer diameter portion 9 having a shape smaller than the inner diameter of the fixing member 5. Is preferred.

以上のように、この実施の形態によれば、固定子鉄心１の外周部に形成されている断面が一つの直線からなる切欠き部４と固定部材５との間の空間６と連結する非接触部１０を、風穴８が存在するコアバック７の外周部に設けることにより、その部分においてはコアバック７の外周部と固定部材５との間に所定の径方向寸法の隙間が存在するので、コアバック７の風穴８の外側に向かう磁束は、図２の矢印で示すように固定部材５には流れない。コアバック７の風穴８の外側に向かう磁束は、非接触部１０と風穴８との間を通る。その結果、固定部材５の鉄損が図１の一般的な電動機の固定子１００よりも低減し、電動機の高効率化が可能となる。   As described above, according to this embodiment, the cross section formed in the outer peripheral portion of the stator core 1 is connected to the space 6 between the notch portion 4 and the fixing member 5 formed of one straight line. By providing the contact portion 10 on the outer peripheral portion of the core back 7 where the air holes 8 exist, there is a gap of a predetermined radial dimension between the outer peripheral portion of the core back 7 and the fixing member 5 in that portion. The magnetic flux toward the outside of the air hole 8 of the core back 7 does not flow to the fixing member 5 as shown by the arrow in FIG. The magnetic flux toward the outside of the air hole 8 of the core back 7 passes between the non-contact portion 10 and the air hole 8. As a result, the iron loss of the fixing member 5 is lower than that of the general electric motor stator 100 shown in FIG. 1, and the efficiency of the electric motor can be increased.

また、空間６と連結する非接触部１０を、風穴８の両側にある空間６のどちらから延ばすのがよいかということに関しては、風穴８から近い方の空間６から形成するのが好ましい。何故ならば、空間６と連結する非接触部１０を、風穴８から近い方の空間６から形成する方が、風穴８から遠い方の空間６から形成するのに比べ、非接触部１０の周方向長さを短くできる。非接触部１０の周方向長さが短くなれば、外径小部９を設けることにより径方向の磁路幅が狭くなるコアバック７の周方向の長さも短くなり、外径小部９によるコアバック７の磁路幅減少への影響を小さくすることが可能となる。   Further, as to which of the spaces 6 on both sides of the air hole 8 should be extended, the non-contact portion 10 connected to the space 6 is preferably formed from the space 6 closer to the air hole 8. This is because the non-contact portion 10 connected to the space 6 is formed from the space 6 closer to the air hole 8 than the space 6 far from the air hole 8 compared to the periphery of the non-contact portion 10. The direction length can be shortened. When the circumferential length of the non-contact portion 10 is shortened, the circumferential length of the core back 7 is reduced by providing the small outer diameter portion 9 and the radial magnetic path width is narrowed. It is possible to reduce the influence of the core back 7 on the magnetic path width reduction.

また、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成する方法として、固定部材５の内径の一部を固定子鉄心１外径より大きい内径大部５ａとし、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成するようにしてもよく、同様の効果を奏する。   Further, as a method of forming the non-contact portion 10 between the outer peripheral portion of the stator core 1 and the fixing member 5, a part of the inner diameter of the fixing member 5 is a large inner diameter portion 5 a larger than the outer diameter of the stator core 1 and fixed. The non-contact portion 10 may be formed between the outer peripheral portion of the core 1 and the fixing member 5, and the same effect is produced.

また、固定子鉄心１の外径小部９又は固定部材５の内径大部５ａを直線形状とすると、径方向幅の大きい部分ができ、コアバック７の磁路の幅が狭くなる箇所ができるため、固定子鉄心１の外径小部９又は固定部材５の内径大部５ａを円弧形状にて構成し、空隙部分の幅が略一定になるようにすることにより、部分的にコアバック７の磁路の幅が狭くなる箇所ができるのを抑制することができる。   Moreover, when the outer diameter small portion 9 of the stator core 1 or the large inner diameter portion 5a of the fixing member 5 is linear, a portion having a large radial width is formed, and a portion where the width of the magnetic path of the core back 7 is narrowed is formed. Therefore, the core back 7 is partially provided by configuring the small outer diameter portion 9 of the stator core 1 or the large inner diameter portion 5a of the fixing member 5 in an arc shape so that the width of the gap portion is substantially constant. It can suppress that the location where the width | variety of this magnetic path becomes narrow is formed.

また、隣り合う切欠き部４同士の間に風穴８が二つ存在する場合、夫々の切欠き部４と固定部材５との間の空間６から、時計方向又は反時計方向に風穴８側に延び、風穴８を通りすぎる所まで夫々非接触部１０を形成するようにしても同様の効果が得られる。   Further, when there are two air holes 8 between the adjacent notches 4, from the space 6 between each notch 4 and the fixing member 5, the air holes 8 are moved in the clockwise or counterclockwise direction. Even if the non-contact portions 10 are formed to extend and pass through the air holes 8, the same effect can be obtained.

また、隣り合う切欠き部４同士の間に存在する二つの風穴８の外側の、固定子鉄心１の中心を通る接線のなす角度をθ３、固定子鉄心１の外周部の固定部材５と接触する接触部１１の角度をθ４とした時、接触部１１は角度θ３内に配置され、且つθ４＜θ３とすることにより、コアバック７の風穴８の外側に向かう磁束は、固定部材５に流れにくくすることができる。それにより、電動機の高効率化が可能となる。   Further, an angle formed by a tangent line passing through the center of the stator core 1 outside the two air holes 8 existing between the adjacent notch portions 4 is in contact with the fixing member 5 on the outer peripheral portion of the stator core 1. When the angle of the contact portion 11 is θ4, the contact portion 11 is disposed within the angle θ3 and θ4 <θ3, so that the magnetic flux toward the outside of the air hole 8 of the core back 7 flows to the fixed member 5. Can be difficult. As a result, the efficiency of the electric motor can be increased.

実施の形態２．
図６乃至図９は実施の形態２を示す図で、図６は固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図、図７は固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図、図８は変形例の固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図、図９は変形例の固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図である。 Embodiment 2. FIG.
6 to 9 are diagrams showing the second embodiment. FIG. 6 is a plan view of a stator 100 of an electric motor provided with a non-contact portion 10 on the stator core 1 side. FIG. 7 is a non-contact diagram on the fixing member 5 side. FIG. 8 is a plan view of the stator 100 of the motor provided with the non-contact portion 10 on the stator core 1 side of the modified example, and FIG. 9 is a fixed member of the modified example. It is a top view of the stator 100 of the electric motor which provided the non-contact part 10 in 5 side.

図６に示すように、本実施の形態では、固定子鉄心１の外周部に切欠き部４が存在しない例を説明する。   As shown in FIG. 6, in the present embodiment, an example in which the cutout portion 4 does not exist in the outer peripheral portion of the stator core 1 will be described.

近接する二つ風穴８が、４箇所に分かれて配置されている。合計８個の風穴８が、設けられる。   Two adjacent air holes 8 are arranged in four locations. A total of eight air holes 8 are provided.

近接する二つ風穴８は、図６の四隅に夫々配置されている。二つ風穴８の外側に、一つの非接触部１０を設ける。近接する二つの風穴８の内側（対向している）の、固定子鉄心１の中心を通る夫々の接線のなす角度をθ１、非接触部１０の角度をθ２とするとき、二つの風穴８は非接触部分θ２内に配置され、さらにθ１＜θ２としている。   Two adjacent air holes 8 are arranged at the four corners of FIG. One non-contact portion 10 is provided outside the two air holes 8. When the angle formed by the respective tangents passing through the center of the stator core 1 inside the two adjacent air holes 8 is θ1 and the angle of the non-contact portion 10 is θ2, the two air holes 8 are It arrange | positions in the non-contact part (theta) 2, and also is (theta) 1 <(theta) 2.

非接触部１０は、固定子鉄心１の外周部の一部の径を他の部分の径よりも小さくすることで形成する。この他の部分の径よりも小さい箇所を、外径小部９と呼ぶ。   The non-contact part 10 is formed by making the diameter of a part of the outer peripheral part of the stator core 1 smaller than the diameter of the other part. A portion smaller than the diameter of this other portion is called a small outer diameter portion 9.

図６のように、近接する二つの風穴８の外側に非接触部１０を形成し、近接する二つの風穴８が非接触部分θ２内に配置され、さらにθ１＜θ２とすることにより、風穴８により風穴８の外側に回り込む磁束が存在しても、固定部材５に磁束が通りにくくなる。   As shown in FIG. 6, the non-contact portion 10 is formed outside the two adjacent air holes 8, and the two adjacent air holes 8 are arranged in the non-contact portion θ2, and further, θ1 <θ2 is satisfied. Therefore, even if there is a magnetic flux that circulates outside the air hole 8, the magnetic flux does not easily pass through the fixing member 5.

非接触部１０の径方向幅は、実施の形態１と同様、０．１〜３ｍｍ程度である。   The radial width of the non-contact portion 10 is about 0.1 to 3 mm as in the first embodiment.

二つの風穴８が存在するコアバック７の外周部に非接触部１０を設けることにより、非接触部１０においてはコアバック７の外周部の外径小部９と固定部材５との間に所定の径方向寸法（０．１〜３ｍｍ程度）の隙間が存在するので、コアバック７の二つの風穴８の外側に向かう磁束は、図６の矢印で示すように固定部材５には流れにくくなる。   By providing the non-contact portion 10 at the outer peripheral portion of the core back 7 where the two air holes 8 exist, a predetermined distance between the outer diameter small portion 9 of the outer peripheral portion of the core back 7 and the fixing member 5 is provided in the non-contact portion 10. Since there is a gap with a radial dimension of about 0.1 to 3 mm, the magnetic flux toward the outside of the two air holes 8 of the core back 7 hardly flows to the fixing member 5 as shown by the arrows in FIG. .

コアバック７の風穴８の外側に向かう磁束は、非接触部１０と風穴８との間を通る。その結果、固定部材５の鉄損が図１の一般的な電動機の固定子１００よりも低減し、電動機の高効率化が可能となる。   The magnetic flux toward the outside of the air hole 8 of the core back 7 passes between the non-contact portion 10 and the air hole 8. As a result, the iron loss of the fixing member 5 is lower than that of the general electric motor stator 100 shown in FIG. 1, and the efficiency of the electric motor can be increased.

また、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成する方法として、図６に示すような固定子鉄心１の外周部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法以外に、例えば、図７に示すように、固定部材５の内径の一部を固定子鉄心１外径より大きい内径大部５ａとし、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成するようにしてもよい。さらに、図示はしないが、固定子鉄心１と固定部材５とお両方の形状を変更することで非接触部１０を形成してもよい。   As a method of forming the non-contact portion 10 between the outer periphery of the stator core 1 and the fixing member 5, a part of the outer periphery of the stator core 1 as shown in FIG. In addition to the method of forming the small outer diameter portion 9 with a small shape, for example, as shown in FIG. 7, a part of the inner diameter of the fixing member 5 is a large inner diameter portion 5 a larger than the outer diameter of the stator core 1. The non-contact part 10 may be formed between the outer peripheral part and the fixing member 5. Furthermore, although not illustrated, the non-contact portion 10 may be formed by changing the shapes of both the stator core 1 and the fixing member 5.

上記のいずれの方法でも、コアバック７の風穴８の外側に向かう磁束を、固定部材５に流れにくいようにすることができる。   Any of the above methods can make it difficult for the magnetic flux toward the outside of the air hole 8 of the core back 7 to flow to the fixing member 5.

図７の固定部材５の内径の一部を固定子鉄心１の外径より大きい形状の内径大部５ａとする方法は、固定子鉄心１のコアバック７の径方向幅が狭くならないので、コアバック７の磁路を確保する点では好ましい。但し、固定部材５の作りやすさから言えば、図６の固定子鉄心１の外周部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法の方が好ましい。   The method in which a part of the inner diameter of the fixing member 5 in FIG. 7 is a larger inner diameter portion 5a having a shape larger than the outer diameter of the stator core 1, the radial width of the core back 7 of the stator core 1 is not reduced. This is preferable in terms of securing the magnetic path of the back 7. However, in terms of ease of making the fixing member 5, a method in which a part of the outer peripheral portion of the stator core 1 in FIG. 6 is made into a small outer diameter portion 9 having a shape smaller than the inner diameter of the fixing member 5 is preferable.

また、図８に示すような切欠き部４が存在する固定子鉄心１であっても有効である。図８に示す電動機の固定子１００は、図６に示す電動機の固定子１００の固定子鉄心１に、図２と同様の切欠き部４を設けたものである。   Further, the stator core 1 having the notch 4 as shown in FIG. 8 is also effective. The stator 100 of the electric motor shown in FIG. 8 is obtained by providing the stator core 1 of the stator 100 of the electric motor shown in FIG.

近接する二つの風穴８の内側（対向している）の、固定子鉄心１の中心を通る夫々の接線のなす角度をθ１、非接触部１０の角度をθ２とするとき、二つの風穴８は非接触部分θ２内に配置され、さらにθ１＜θ２としている。   When the angle formed by the respective tangents passing through the center of the stator core 1 inside the two adjacent air holes 8 is θ1 and the angle of the non-contact portion 10 is θ2, the two air holes 8 are It arrange | positions in the non-contact part (theta) 2, and also is (theta) 1 <(theta) 2.

このように構成することにより、固定部材５に流れる磁束が低減し、固定部材５の鉄損低減が可能である。   By configuring in this way, the magnetic flux flowing through the fixing member 5 is reduced, and the iron loss of the fixing member 5 can be reduced.

また、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成する方法として、図８に示すような固定子鉄心１の外周部の一部を、固定部材５の内径より小さい形状の外径小部９にする方法以外に、例えば、図９に示すように、固定部材５の内径の一部を固定子鉄心１外径より大きい内径大部５ａとし、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成するようにしてもよい。さらに、図示はしないが、固定子鉄心１と固定部材５とお両方の形状を変更することで非接触部１０を形成してもよい。   Further, as a method of forming the non-contact portion 10 between the outer periphery of the stator core 1 and the fixing member 5, a part of the outer periphery of the stator core 1 as shown in FIG. In addition to the method of forming the small outer diameter portion 9 with a small shape, for example, as shown in FIG. 9, a part of the inner diameter of the fixing member 5 is a larger inner diameter portion 5 a larger than the outer diameter of the stator core 1, and the stator core 1 The non-contact part 10 may be formed between the outer peripheral part and the fixing member 5. Furthermore, although not illustrated, the non-contact portion 10 may be formed by changing the shapes of both the stator core 1 and the fixing member 5.

上記のいずれの方法でも、コアバック７の風穴８の外側に向かう磁束を、固定部材５に流れにくいようにすることができる。   Any of the above methods can make it difficult for the magnetic flux toward the outside of the air hole 8 of the core back 7 to flow to the fixing member 5.

また、コアバック７の磁路は、スロット２の径方向に存在するコアバック７の磁路幅に対して、ティース３の径方向の延長線上に存在するコアバック７の磁路幅が大きく、風穴８はティース３の径方向の延長線上に存在するほうがよい。さらに、非接触部１０の周方向端部もティースの径方向の延長線上に存在する方が好ましいが、必須ではない。   In addition, the magnetic path of the core back 7 has a larger magnetic path width of the core back 7 existing on the radial extension line of the teeth 3 than the magnetic path width of the core back 7 existing in the radial direction of the slot 2. The air holes 8 are preferably present on the radial extension of the teeth 3. Furthermore, although it is preferable that the circumferential direction end part of the non-contact part 10 exists also on the extension line | wire of the radial direction of teeth, it is not essential.

非接触部１０の径方向の寸法は、磁束が固定部材５に流れないようにするには、できるだけ大きい方がよい。しかし、非接触部１０の径方向の寸法が大きいと、コアバック７の径方向の磁路幅が小さくなって、電動機の効率が悪化する。そこで、非接触部１０の径方向の寸法は、０．１〜３ｍｍ程度（所定の径方向寸法）とする。   The dimension of the non-contact portion 10 in the radial direction is preferably as large as possible so that the magnetic flux does not flow to the fixed member 5. However, if the dimension in the radial direction of the non-contact portion 10 is large, the magnetic path width in the radial direction of the core back 7 becomes small, and the efficiency of the electric motor deteriorates. Therefore, the dimension in the radial direction of the non-contact portion 10 is about 0.1 to 3 mm (predetermined radial dimension).

また、非接触部１０の断面形状を直線形状とすると、空隙の大きい部分が発生し、コアバック７の磁路の幅が狭くなる部分ができる。そのため、固定子鉄心１外周または固定部材５の内径を円弧形状にて構成し、空隙部分の径方向幅が略一定になるようにすることにより、コアバック７の磁路の幅が狭くなる部分ができるのを回避できる。非接触部１０によるコアバック７の幅の縮小を抑制することができる。   Further, when the cross-sectional shape of the non-contact portion 10 is a linear shape, a portion having a large gap is generated, and a portion where the width of the magnetic path of the core back 7 is narrowed is formed. Therefore, a portion where the width of the magnetic path of the core back 7 is narrowed by configuring the outer periphery of the stator core 1 or the inner diameter of the fixing member 5 in an arc shape and making the radial width of the gap portion substantially constant. You can avoid being able to. Reduction of the width of the core back 7 by the non-contact part 10 can be suppressed.

また、固定子と固定部材との非接触部分は、対応する風穴の一部の外側に構成しても効果を示すことは可能である。   Further, even if the non-contact portion between the stator and the fixing member is formed outside a part of the corresponding air hole, the effect can be exhibited.

また、切欠き部４が存在するコアバック７部分は、他のコアバック７部分よりも磁路幅が狭く、磁束密度が高いため、切欠き部４が存在するコアバック７部分に風穴８を設けると、磁束密度が高くなり効率が低下するため、切欠き部４が存在するコアバック７部分には風穴８は存在しないほうがよい。   In addition, the core back 7 portion where the notch 4 is present has a narrower magnetic path width and higher magnetic flux density than the other core back 7 portions, so that the air hole 8 is provided in the core back 7 portion where the notch 4 exists. If provided, the magnetic flux density is increased and the efficiency is lowered. Therefore, it is preferable that the air hole 8 does not exist in the core back 7 portion where the notch portion 4 exists.

以上のように、本実施の形態では、固定子鉄心１の外周部に切欠き部４が存在しない場合で、近接する二つ風穴８が、４箇所に分かれて配置されている。近接する二つの風穴８の外側に非接触部１０を形成し、近接する二つの風穴８が非接触部分θ２内に配置され、さらにθ１＜θ２とすることにより、風穴８により風穴８の外側に回り込む磁束が存在しても、固定部材５に磁束が通りにくくなり、固定部材５の鉄損低減が可能である。   As described above, in the present embodiment, when the notched portion 4 is not present on the outer peripheral portion of the stator core 1, the two adjacent air holes 8 are arranged in four portions. The non-contact part 10 is formed outside the two adjacent air holes 8, and the two adjacent air holes 8 are arranged in the non-contact part θ 2, and further θ 1 <θ 2, so that the air holes 8 bring the outside of the air hole 8. Even if the magnetic flux that wraps around exists, it is difficult for the magnetic flux to pass through the fixing member 5, and iron loss of the fixing member 5 can be reduced.

また、固定部材５の内径の一部を固定子鉄心１外径より大きい内径大部５ａとし、固定子鉄心１外周部と固定部材５との間に非接触部１０を形成するようにしても同様の効果を奏する。   In addition, a part of the inner diameter of the fixing member 5 may be a large inner diameter portion 5 a larger than the outer diameter of the stator core 1, and the non-contact portion 10 may be formed between the outer periphery of the stator core 1 and the fixing member 5. The same effect is produced.

また、固定子鉄心１と固定部材５とお両方の形状を変更することで非接触部１０を形成しても同様の効果を奏する。   Moreover, even if the non-contact part 10 is formed by changing the shapes of both the stator core 1 and the fixing member 5, the same effect is obtained.

実施の形態１又は実施の形態２の切欠き部４は、固定子鉄心１の外周部に、断面が直線のみ、または直線と曲線（例えば、円弧）とで構成される形状（図示せず）である。   The notch 4 of the first embodiment or the second embodiment has a shape (not shown) in which the cross section is only a straight line or a straight line and a curved line (for example, an arc) on the outer periphery of the stator core 1. It is.

さらに、非接触部１０は、固定子鉄心１と固定部材５との間に、径方向寸法が０．１〜３ｍｍ程度で形成される。   Further, the non-contact part 10 is formed between the stator core 1 and the fixing member 5 with a radial dimension of about 0.1 to 3 mm.

また，図示はしないが、非接触部１０の一部にくぼみを設けてもよい。   Although not shown, a recess may be provided in a part of the non-contact portion 10.

また、回転子に焼結希土類磁石を使用すると、焼結希土類磁石は高磁力であるため、固定子鉄心１のコアバック７の磁束密度が高くなり、固定部材５の鉄損が大きくなる。このような場合、実施の形態１または実施の形態２の固定子鉄心１を用いることにより、固定部材５の鉄損が大きくなるのを抑制することができる。   Further, when a sintered rare earth magnet is used for the rotor, the sintered rare earth magnet has a high magnetic force, so that the magnetic flux density of the core back 7 of the stator core 1 increases, and the iron loss of the fixing member 5 increases. In such a case, by using the stator core 1 of the first embodiment or the second embodiment, the iron loss of the fixing member 5 can be suppressed from increasing.

また、実施の形態１または実施の形態２に示す固定子鉄心１を用いた電動機は、固定部材５の鉄損が減少するので電動機の効率が上がり、そのため経年変化が小さくなり、長寿命な電動機が得られる。   Further, in the electric motor using the stator core 1 shown in the first embodiment or the second embodiment, the iron loss of the fixing member 5 is reduced, so that the efficiency of the electric motor is increased. Is obtained.

また、実施の形態１または実施の形態２に示す固定子鉄心１を用いた電動機は、巻線方式が分布巻又は集中巻によらず上記効果を奏する。   Moreover, the electric motor using the stator core 1 shown in the first embodiment or the second embodiment has the above effect regardless of whether the winding method is distributed winding or concentrated winding.

また、実施の形態１または実施の形態２に示す固定子鉄心１を用いた電動機を圧縮機に搭載することにより、高効率、安価、長寿命な圧縮機が得られる。   Further, by mounting an electric motor using the stator core 1 shown in Embodiment 1 or Embodiment 2 on the compressor, a highly efficient, inexpensive, and long-life compressor can be obtained.

比較のために示す一般的な電動機の固定子１００を示す平面図。The top view which shows the stator 100 of the common electric motor shown for a comparison. 実施の形態１を示す図で、固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 3 shows the first embodiment, and is a plan view of a stator 100 of an electric motor in which a non-contact portion 10 is provided on the stator core 1 side. 実施の形態１を示す図で、固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 5 shows the first embodiment, and is a plan view of a stator 100 of an electric motor provided with a non-contact portion 10 on the fixing member 5 side. 実施の形態１を示す図で、変形例の固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 5 shows the first embodiment, and is a plan view of a stator 100 of an electric motor in which a non-contact portion 10 is provided on the stator core 1 side of a modified example. 実施の形態１を示す図で、変形例の固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 5 shows the first embodiment, and is a plan view of a stator 100 of an electric motor in which a non-contact portion 10 is provided on the fixed member 5 side of a modified example. 実施の形態２を示す図で、固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 5 shows the second embodiment and is a plan view of a stator 100 of an electric motor in which a non-contact portion 10 is provided on the stator core 1 side. 実施の形態２を示す図で、固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 5 shows the second embodiment, and is a plan view of a stator 100 of an electric motor provided with a non-contact portion 10 on the fixing member 5 side. 実施の形態２を示す図で、変形例の固定子鉄心１側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 10 shows the second embodiment, and is a plan view of a stator 100 of an electric motor in which a non-contact portion 10 is provided on the stator core 1 side of a modified example. 実施の形態２を示す図で、変形例の固定部材５側に非接触部１０を設けた電動機の固定子１００の平面図。FIG. 9 shows the second embodiment, and is a plan view of a stator 100 of an electric motor in which a non-contact portion 10 is provided on the fixed member 5 side of a modified example.

符号の説明Explanation of symbols

１ 固定子鉄心、２ スロット、２ａ スロット開口部、３ ティース、４ 切欠き部、５ 固定部材、５ａ 内径大部、６ 空間、７ コアバック、８ 風穴、９ 外径小部、１０ 非接触部、１１ 接触部、１００ 電動機の固定子。   DESCRIPTION OF SYMBOLS 1 Stator iron core, 2 slots, 2a slot opening part, 3 teeth, 4 notch part, 5 fixing member, 5a inner diameter large part, 6 space, 7 core back, 8 air hole, 9 outer diameter small part, 10 non-contact part , 11 Contact portion, 100 Stator of electric motor.

Claims (11)

磁性体で構成される円筒状の固定部材の内部に固定子鉄心が固定される電動機の固定子であって、
前記固定子鉄心は、
外周部の複数箇所に周方向に所定の長さで形成され、前記固定部材との間に空間を形成する切欠き部と、
前記切欠き部同士の間のコアバックに設けられ、軸方向に貫通する風穴とを備え、
前記空間に連通し、該空間から時計方向又は反時計方向に前記風穴側に延び、前記風穴の径方向外側で該風穴まで達するように形成される非接触部を設けたことを特徴とする電動機の固定子。 A stator of an electric motor in which a stator core is fixed inside a cylindrical fixing member made of a magnetic material,
The stator core is
A notch portion that is formed in a predetermined length in the circumferential direction at a plurality of locations on the outer peripheral portion, and forms a space between the fixing member,
Provided in the core back between the notches, provided with an air hole penetrating in the axial direction,
An electric motor comprising: a non-contact portion that communicates with the space, extends from the space in the clockwise or counterclockwise direction to the air hole side, and is formed to reach the air hole on a radially outer side of the air hole. Stator. 磁性体で構成される円筒状の固定部材の内部に固定子鉄心が固定される電動機の固定子であって、
前記固定子鉄心は、
外周部の複数箇所に周方向に所定の長さで形成され、前記固定部材との間に空間を形成する切欠き部と、
前記切欠き部同士の間のコアバックに設けられ、軸方向に貫通する少なくとも二つの風穴とを備え、
前記空間に連通し、該空間から時計方向又は反時計方向に前記風穴側に延び、前記風穴の径方向外側で該風穴まで達するように形成される非接触部を設け、且つ前記二つの風穴の外側の前記固定子鉄心の中心を通る夫々の接線のなす角度をθ３、前記接触部の角度をθ４とする時、前記接触部は角度θ３内に配置され、且つθ４＜θ３とすることを特徴とする電動機の固定子。 A stator of an electric motor in which a stator core is fixed inside a cylindrical fixing member made of a magnetic material,
The stator core is
A notch portion that is formed in a predetermined length in the circumferential direction at a plurality of locations on the outer peripheral portion, and forms a space between the fixing member,
Provided in the core back between the notches, and comprising at least two air holes penetrating in the axial direction;
A non-contact portion that communicates with the space, extends from the space in the clockwise or counterclockwise direction toward the air hole, and reaches the air hole on the radially outer side of the air hole; and When the angle formed by the respective tangents passing through the center of the outer stator core is θ3 and the angle of the contact portion is θ4, the contact portion is disposed within the angle θ3, and θ4 <θ3. The stator of the motor. 磁性体で構成される円筒状の固定部材の内部に固定子鉄心が固定される電動機の固定子であって、
前記固定子鉄心は、コアバックに軸方向に貫通する複数の風穴を備え、前記風穴の径方向外側に非接触部を設け、且つ近接する二つの前記風穴の内側の前記固定子鉄心の中心を通る接線のなす角度をθ１、前記非接触部の角度をθ２とするとき、前記二つの風穴は非接触部分θ２内に配置され、さらにθ１＜θ２とすることを特徴とする電動機の固定子。 A stator of an electric motor in which a stator core is fixed inside a cylindrical fixing member made of a magnetic material,
The stator core includes a plurality of air holes penetrating in the axial direction in the core back, a non-contact portion is provided on the radially outer side of the air hole, and the center of the stator core inside the two adjacent air holes is provided. The stator of the motor according to claim 1, wherein the angle between the tangents passing through is θ1 and the angle of the non-contact portion is θ2, the two air holes are arranged in the non-contact portion θ2, and θ1 <θ2. 前記固定子鉄心は、前記風穴が存在しない前記コアバックの外周部に切欠き部を備えることを特徴とする請求項３記載の電動機の固定子。   4. The stator for an electric motor according to claim 3, wherein the stator core includes a notch in an outer peripheral portion of the core back where the air hole is not present. 前記非接触部は、以下に示すいずれかの方法により形成することを特徴とする請求項１乃至４のいずれかに記載の電動機の固定子。
（１）前記固定子鉄心の外周部の前記切欠き部の間の円弧部の一部を、前記固定部材の内径より小さい外径小部とする；
（２）前記固定部材の内径の一部を前記固定子鉄心の外径より大きい内径大部とする；
（３）前記（１）と前記（２）との組み合わせ。 The stator of an electric motor according to any one of claims 1 to 4, wherein the non-contact part is formed by any of the following methods.
(1) A part of the circular arc portion between the cutout portions of the outer peripheral portion of the stator core is a small outer diameter portion smaller than the inner diameter of the fixing member;
(2) A part of the inner diameter of the fixing member is a larger inner diameter than the outer diameter of the stator core;
(3) A combination of (1) and (2). 前記固定子鉄心の前記外径小部又は前記固定部材の前記内径大部を略円弧形状にて構成し、前記非接触部の径方向の幅が略一定になるようにしたことを特徴とする請求項５記載の電動機の固定子。   The outer diameter small portion of the stator core or the large inner diameter portion of the fixing member is formed in a substantially arc shape, and the radial width of the non-contact portion is substantially constant. The stator of the electric motor according to claim 5. 前記風穴は、前記固定子鉄心のティースの径方向の延長線上の前記コアバックに存在することを特徴とする請求項１乃至６のいずれかに記載の電動機の固定子。   The stator of an electric motor according to any one of claims 1 to 6, wherein the air hole is present in the core back on a radial extension line of teeth of the stator core. 前記非接触部の周方向端部が、前記固定子鉄心のティースの径方向の延長線上に存在することを特徴とする請求項１乃至７のいずれかに記載の電動機の固定子。   The stator of the electric motor according to any one of claims 1 to 7, wherein an end portion in a circumferential direction of the non-contact portion exists on an extension line in a radial direction of teeth of the stator core. 請求項１乃至８いずれかに記載の電動機の固定子を備えたことを特徴とする電動機。   An electric motor comprising the stator of the electric motor according to claim 1. 焼結希土類磁石を使用した回転子を備えたことを特徴とする請求項９記載の電動機。   The electric motor according to claim 9, further comprising a rotor using a sintered rare earth magnet. 請求項９又は請求項１０記載の電動機を備えたことを特徴とする圧縮機。   A compressor comprising the electric motor according to claim 9 or 10.
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