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JP3635948B2 - Rotating electric machine - Google Patents
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JP3635948B2 - Rotating electric machine - Google Patents

Rotating electric machine Download PDF

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Publication number
JP3635948B2
JP3635948B2 JP32650498A JP32650498A JP3635948B2 JP 3635948 B2 JP3635948 B2 JP 3635948B2 JP 32650498 A JP32650498 A JP 32650498A JP 32650498 A JP32650498 A JP 32650498A JP 3635948 B2 JP3635948 B2 JP 3635948B2
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Japan
Prior art keywords
rolling bearing
bearing
ring
rotating shaft
stator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP32650498A
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Japanese (ja)
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JP2000156952A (en
Inventor
好秀 金原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP32650498A priority Critical patent/JP3635948B2/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07Fixing them on the shaft or housing with interposition of an element
    • F16C35/077Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173Means 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
    • H02K5/1732Means 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07Fixing them on the shaft or housing with interposition of an element
    • F16C35/073Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08Insulating casings

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

Description

【0001】
【発明の属する技術分野】
この発明は、軸受として転がり軸受を用いた回転電機に係り、特にインバータ駆動される誘導電動機として好適な交流電動機等の回転電機に関する。
【0002】
【従来の技術】
交流モータのインバータ運転を行なう際に、スイッチングに伴って発生するモータ騒音の低減を図る目的から、インバータのキャリア周波数を高く設定するようになっている。
キャリア周波数を高く設定するに伴って、交流モータの回転軸に高周波誘導に基づいて発生する電圧(軸電圧)が増大し、回転軸を支持している転がり軸受の内輪と外輪との間に存在する電位差が大きくなるので、転がり軸受に電流が流れ易くなっている。この転がり軸受に流れる電流は、内輪、外輪両軌道並びに転動体の転動面に電食と呼ばれる腐食を発生させて、転がり軸受の耐久性を悪化させるという問題点があった。
【0003】
図8は、例えば特開平10−75551号公報に示された従来のファン駆動用モータの構造を示す図で、回転軸とモータケースとの間に設けた転がり軸受に電流が流れるのを防止し、転がり軸受に電食が発生するのを防止することを目的としたものである。
【0004】
図において、41aはファン駆動用電動モータで、金属製のモータケース42と、このモータケース42の内側に一対の転がり軸受43,43を介して回転自在に支持された金属製の回転軸44とを有する。モータケース42は、円筒状のケース本体(フレーム)45と、ケース本体45の前端開口を塞ぐ前蓋46と、ケース本体45の後端開口を塞ぐ後蓋47とから成る。48は前蓋46の保持段部、49は後蓋47の保持凹部である。
【0005】
51は転がり軸受43の外輪、52は転がり軸受43の内輪、53は外輪51の内周面の外輪軌道と内輪52の外周面の内輪軌道との間にそれぞれ複数個ずつ設けられた転動体である。54は、保持凹部49の奥面と保持凹部49に内嵌した転がり軸受43の外輪51の端面との間に挟持され、外輪51を他方の外輪51に向け押圧する波板ばねである。
55はロータ(回転子)、56はステータ(固定子)である。57は回転軸44の両端部に形成した小径部、58は回転軸44の外周面に形成した段部である。
【0006】
一対の転がり軸受43の内輪52は、回転軸44の両端部に形成した小径部57の周囲に、絶縁スリーブ60aを介して外嵌固定している。この絶縁スリーブ60aは、硬質ゴム、合成樹脂等の絶縁材により、断面L字形で全体を略円筒状に形成している。すなわち、絶縁スリーブ60aは、小径部57に外嵌自在な円筒部61aの外周面一端縁に大鍔部62aを、外周面他端縁に小鍔部63aをそれぞれ形成している。
【0007】
大鍔部62aを回転軸44の外周面に形成した段部58に対向させた状態で、回転軸44に外嵌している。
絶縁スリーブ60aに外嵌した内輪52を回転軸44に支持した状態で、大鍔部62aは内輪52の一端面と段部58との間に挟持されて、これら内輪52の一端面と段部58とが当接するのを阻止する。また、円筒部61aは内輪52の内周面と小径部63aの外周面との間に挟持されて、これら両周面同士が当接するのを阻止する。さらに、小鍔部63aは内輪52の他端面内周縁部に係合して、内輪52と絶縁スリーブ60aとが不用意に分離するのを防止する。
【0008】
回転軸44を支持する転がり軸受43を構成する内輪52と、内輪52を保持している部材である回転軸44との取付個所が絶縁されているので、回転軸44の電位がモータケース42の電位より高くなっても、内輪52を組み込んで成る転がり軸受43に電流が流れることがなくなる。
インバータからステータ56に印加される高周波電流に基づいて回転軸44に軸電圧が惹起されても、回転軸44とモータケース42との間に電流が流れることがないので、転がり軸受43に電食が発生することがなくなる。
【0009】
図9は、例えば特開平10−75551号公報に示された従来のファン駆動用モータの構造を示す図で、一対の転がり軸受の外輪を、モータケースの両端部に形成した前蓋あるいは後蓋の保持凹部の内側に、絶縁スリーブを介して内嵌固定したものである。
【0010】
図において、42〜49、51〜59は前述の図8と同様であり、その説明を省略する。41bはファン駆動用電動モータ、60bは絶縁スリーブ、61bは円筒部、62bは大鍔部、63bは小鍔部である。
【0011】
また、回転軸44を支持する転がり軸受43,43を構成する外輪51,51と、外輪51,51を保持している部材であるモータケース42との取付個所が絶縁されているので、回転軸44の電位がモータケース42の電位より高くなっても、外輪51,51を組み込んで成る転がり軸受43,43に電流が流れることがなくなり、転がり軸受43に電食が発生することがなくなる。
【0012】
図10は、例えば特開平10−75551号公報に示された従来の転がり軸受の構造を示す図で、転がり軸受の外輪と保持段部あるいは保持凹部との間、あるいは転がり軸受の内輪と回転軸との間に設ける絶縁スリーブ若しくは絶縁層の構造を示すものである。
【0013】
図において、(a)は転がり軸受の外輪の外周面(または内輪内周面)および一端面に係止凹溝71,71を形成し、これら各係止凹溝71,71と絶縁スリーブ72に形成した係止突状73,73とを係合させたもので、外輪と絶縁スリーブとの分離防止を図る。
【0014】
図において、(b)は転がり軸受の外輪外周面(または内輪内周面)に複数本の係止凹溝74,74を全周に亙って形成するとともに、この外輪の外周面および両端面に、ポリ四弗化エチレン(PTFE)等弗素樹脂の焼き付け皮膜等の絶縁層75を形成している。さらに、各係止凹溝74,74には、ニトリル等のゴム、あるいは熱可塑性エラストマー等の弾性材製のOリング76,76を装着している。
外輪を保持段部あるいは保持凹部に内嵌した状態で、これらOリングは、保持段部あるいは保持凹部の内周面と摩擦係合し、これら保持段部あるいは保持凹部の内側で外輪が回転(クリープ)するのを防止する。
【0015】
【発明が解決しようとする課題】
上記の図8、図9に示したような従来のモータにおいては、転がり軸受の外輪と保持段部あるいは保持凹部との間、あるいは転がり軸受の内輪と回転軸との間に絶縁スリーブ若しくは絶縁層を設けることにより、回転軸とモータケースとの間に設けた転がり軸受に電流が流れるのを防止し、転がり軸受に電食が発生するのを防止するものであるが、転がり軸受と絶縁スリーブとの分離防止を図るために固く嵌め合わせる必要があり、モータ組立における作業性が悪いという問題点があった。
【0016】
また、図10においては、転がり軸受と絶縁スリーブとの分離防止を図るために、転がり軸受の外輪(または内輪)の外周面および一端面に、絶縁スリーブに形成した係止突状とを係合させるための係止凹溝を形成しなければならず、特殊な形状の転がり軸受を使用しなければならないという問題点があった。
【0017】
この発明は、上述のような課題を解決するためになされたもので、回転軸とモータケースとの間に設けた転がり軸受に電流が流れるのを防止し、転がり軸受に電食が発生するのを防止できる、簡便な構成で組み立ての容易な回転電機を得るものである。
【0018】
【課題を解決するための手段】
コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着され、転がり軸受を介して回転自在に支承される回転軸と、絶縁材を介して前記転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記軸受ブラケットの前記絶縁材と接触する側の前記転がり軸受の外輪の外周面と対応する側および前記転がり軸受の外輪の側面と対応する側であってプレロードスプリングの当たり面に凹部を設け、前記軸受ブラケットの凹部に対応する凸部を設けた絶縁材の凸部を、前記軸受ブラケットの凹部に勘合し固定するようにしたものである。
【0024】
また、コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着され、転がり軸受を介して回転自在に支承される回転軸と、Oリングを介して前記転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記軸受ブラケットの前記Oリングと接触する側前記Oリングを挿入する凹部を設けるとともに、前記転がり軸受の外輪の側面と前記軸受ブラケットとの間に絶縁ワッシャーを設けたものである。
【0025】
また、コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着される回転軸と、Oリングを介してこの回転軸を回転自在に支承する転がり軸受と、この転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記回転軸の前記転がり軸受を支持する側前記Oリングを挿入する凹部を設けるとともに、前記転がり軸受の内輪の側面と前記回転軸の段部との間に絶縁ワッシャーを設けたものである。
【0026】
【発明の実施の形態】
実施の形態1.
図1はこの発明の一実施の形態である回転電機の軸受部の構造を示す図であり、軸受ブラケットと転がり軸受との間に絶縁材を挿入するようにしたものである。軸受ブラケットの絶縁材と接触する側に凹部を設けるとともに、絶縁材に軸受ブラケットの凹部に対応する凸部を設け、軸受ブラケットの凹部に絶縁材の凸部を勘合し固定するようにしたものである。
【0027】
図において、1aはフレームなどのケース本体(図示せず)とモータケース(図示せず)を構成する軸受ブラケット、2aはテフロンやニトリルゴム、シリコンゴム等からなる絶縁材、3は転がり軸受、4は押え板またはプレロードスプリングである。ここで、軸受ブラケット1aは従来例で記載の前蓋46、後蓋47に相当するものである。
5a,5bは軸受ブラケット1aの絶縁材2aと接触する側に設けられた凹部、6a,6bは絶縁材2aに設けられた凸部で、軸受ブラケット1aに設けられた凹部5a,5bに対応するものである。凹部5aは転がり軸受との嵌め合い側に設けられた凹部であり、凹部5bは転がり軸受の外輪の側面側であって押え板またはプレロードスプリングなどの当たり面に設けられた凹部である。
また、44は回転軸、57は回転軸44の小径部、58は回転軸44の段部である。
【0028】
図2はこの発明の一実施の形態である回転電機の軸受部の構造を示す図である。図において、1bはフレームなどのケース本体(図示せず)とモータケース(図示せず)を構成する軸受ブラケット、2bはテフロンやニトリルゴム、シリコンゴム等からなる絶縁材、3は転がり軸受、4は押え板またはプレロードスプリングである。
5c,5dは軸受ブラケット1bの絶縁材2bと接触する側に設けられた凹部、6c,6dは絶縁材2bに設けられた凸部で、軸受ブラケット1bに設けられた凹部5c,5dに対応するものである。凹部5c,5dは転がり軸受との嵌め合い側に設けられた凹部である。
また、44は回転軸、57は回転軸44の小径部、58は回転軸44の段部である。
【0029】
組立時には、絶縁材2a,2bは軸受ブラケット1a,1bに嵌め合わせるだけで良く、転がり軸受3の外輪、押え板またはプレロードスプリングなどで押されることにより、軸受ブラケットの凹部と絶縁材の凸部とが勘合し、安定に固定できる。
【0030】
この実施の形態では、軸受ブラケットの絶縁材と接触する側に凹部を設けるとともに、絶縁材に軸受ブラケットの凹部に対応する凸部を設けるようにし、軸受ブラケットの凹部に絶縁材の凸部を勘合し固定するようにしたので、絶縁材としてテフロンやニトリルゴム、シリコンゴム等を使用してもずれることはなく、長期間安定に保持できる。
また、軸受ブラケットに設けた凹部と絶縁材に設けた凸部とを使用して絶縁材を固定するようにしたので、一般に使用しているものと同等の転がり軸受が使用できる。
【0031】
実施の形態2.
図3は、この発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。図において、3は転がり軸受、4は押え板またはプレロードスプリング、11は軸受ブラケット、12は回転軸、13は回転軸12の小径部、14は回転軸12の段部、15はテフロンやニトリルゴム、シリコンゴム等からなる絶縁材である。
16a,16bは回転軸12の絶縁材15と接触する側に設けられた凹部、17a,17bは絶縁材15に設けられた凸部で、回転軸12に設けられた凹部16a,16bに対応するものである。凹部16aは回転軸12の段部側に設けられた凹部であり、16bは転がり軸受との嵌め合い側に設けられた凹部である。
また、18は絶縁材15に設けられたテーパ部である。
【0032】
絶縁材は、転がり軸受の内輪の空転を防ぐため、固く嵌め合わせる必要があり、固めの材質のものを使用する。また、転がり軸受を圧入しやすいようにテーパ状とし、回転軸及び内輪との嵌め合い部分にはすべり止めのためのローレット加工等をすると良い。
【0033】
この実施の形態では、回転軸の絶縁材と接触する側に凹部を設けるとともに、絶縁材に回転軸の凹部に対応する凸部を設けるようにし、回転軸の凹部に絶縁材の凸部を勘合し固定するようにしたので、絶縁材としてテフロンやニトリルゴム、シリコンゴム等を使用してもずれることはなく、長期間安定に保持できる。
また、回転軸に設けた凹部と絶縁材に設けた凸部とを使用して絶縁材を固定するようにしたので、一般に使用しているものと同等の転がり軸受が使用できる。
【0034】
実施の形態3.
図4は、この発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。図において、1cはフレームなどのケース本体(図示せず)とモータケース(図示せず)を構成する軸受ブラケット、3は転がり軸受、4は押え板またはプレロードスプリングである。5e,5fは軸受ブラケット1cに設けられた凹部、20はOリング、21は絶縁ワッシャーである。
また、44は回転軸、57は回転軸44の小径部、58は回転軸44の段部である。
【0035】
軸受ブラケット1cにOリング溝としての凹部5e,5fを設け、Oリング20を介して転がり軸受3の外輪の外周面を支持固定するとともに、転がり軸受3の外輪の側面とプレロードスプリングとの間に絶縁ワッシャーを設けたものである。
【0036】
Oリングは一般に弾力性のあるゴムやプラスチックを材料としている絶縁体である。軸受ブラケットにはOリング溝を凹状に設け、そこにOリングを嵌め込むが、転がり軸受挿入時転がり軸受と軸受ブラケットとの間にわずかな空隙ができるように設定される。
Oリング接触部分の摩擦力はかなり強いが、グリース等が混入することによりすべることもある。その対策としては、ベアリングの内輪及び軸のOリング溝にローレット状の凹凸を設けることにより対策できる。
【0037】
転がり軸受3は、Oリング20と絶縁ワッシャー21とにより軸受ブラケット1cと絶縁されるので、回転軸とモータケースを構成する軸受ブラケットとの間に設けた転がり軸受に電流が流れるのを防止し、転がり軸受に電食が発生するのを防止できる。
【0038】
絶縁ワッシャーは、プレロードスプリングにより常に適度な圧力がかけられているので、安定に固定することができる。
また、Oリングは転がり軸受を中心に保持し、回り止めの効果があり、さらにOリングにすることにより、ガタがなく、また、ステータの巻線の電磁力による振動音がベアリングを通じて伝わることがないので、低騒音の回転電機が実現できる。
【0039】
図5は、この発明の一実施の形態に係る回転電機の軸受部の構造を示す図であり、転がり軸受の外輪に凹部を設けたものである。図において、4は押え板またはプレロードスプリング、11はフレームなどのケース本体(図示せず)とモータケース(図示せず)を構成する軸受ブラケットである。20はOリング、21は絶縁ワッシャー、22は転がり軸受、23は転がり軸受22の外輪にOリング溝として設けられた凹部である。
また、44は回転軸、57は回転軸44の小径部、58は回転軸44の段部である。
【0040】
実施の形態4.
図6はこの発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。図において、3は転がり軸受、4は押え板またはプレロードスプリング、11はフレームなどのケース本体(図示せず)とモータケース(図示せず)を構成する軸受ブラケットである。24は回転軸、25は回転軸24の小径部、26は回転軸24の段部、27は小径部25の外周面にOリング溝として設けられた凹部である。28は絶縁ワッシャー、29はOリングである。
【0041】
回転軸24の小径部25の外周面にOリング溝として凹部27を設け、この凹部27にOリング29を装着し、回転軸24と転がり軸受3の内輪の内周面との間にわずかな空隙ができるように設定する。また、転がり軸受3の内輪の側面と回転軸24の段部26と間に絶縁ワッシャー28を装着する。
【0042】
転がり軸受3は、 絶縁ワッシャー28およびOリング29により回転軸24と絶縁されるので、回転軸とモータケースを構成する軸受ブラケットとの間に設けた転がり軸受に電流が流れるのを防止し、転がり軸受に電食が発生するのを防止できる。
【0043】
図7はこの発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。図において、4は押え板またはプレロードスプリング、11はフレームなどのケース本体(図示せず)とモータケース(図示せず)を構成する軸受ブラケットである。30は転がり軸受、31は転がり軸受30の内周面にOリング溝として設けられた凹部、32はOリング、33は絶縁ワッシャーである。
また、44は回転軸、57は回転軸44の小径部、58は回転軸44の段部である。
【0044】
図6では回転軸の小径部の外周面に、回転軸と転がり軸受の内輪の内周面との間にわずかな空隙ができるように装着するOリング用の凹部を設けた例を示したが、図7はOリング用の凹部を転がり軸受の内輪の内周面に設けたものである。
【0045】
【発明の効果】
この発明は、以上説明したように構成されているので、以下に示すような効果を奏する。
【0046】
コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着され、転がり軸受を介して回転自在に支承される回転軸と、絶縁材を介して前記転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記軸受ブラケットの前記絶縁材と接触する側の前記転がり軸受の外輪の外周面と対応する側および前記転がり軸受の外輪の側面と対応する側であってプレロードスプリングの当たり面に凹部を設け、前記軸受ブラケットの凹部に対応する凸部を設けた絶縁材の凸部を、前記軸受ブラケットの凹部に勘合し固定するようにしたので、一般に使用しているものと同等の転がり軸受を使用して、回転軸とモータケースとの間に設けた転がり軸受に電流が流れるのを防止する構成で、組み立ての容易な回転電機が得られる。
【0052】
また、コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着され、転がり軸受を介して回転自在に支承される回転軸と、前記転がり軸受をOリングを介して支持する軸受ブラケットと、を有する回転電機において、前記軸受ブラケットの前記Oリングと接触する側前記Oリングを挿入する凹部を設けるとともに、前記転がり軸受の外輪の側面と前記軸受ブラケットとの間に絶縁ワッシャーを設けたので、凸部を設けた絶縁材を使用することなく、簡便な構成で組み立ての容易な回転電機が得られる。
【0053】
また、コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着される回転軸と、Oリングを介してこの回転軸を回転自在に支承する転がり軸受と、この転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記回転軸の前記転がり軸受を支持する側前記Oリングを挿入する凹部を設けるとともに、前記転がり軸受の内輪の側面と前記回転軸の段部との間に絶縁ワッシャーを設けたので、凸部を設けた絶縁材を使用することなく、簡便な構成で組み立ての容易な回転電機が得られる。
【図面の簡単な説明】
【図1】 この発明の一実施の形態である回転電機の軸受部の構造を示す図であり、軸受ブラケットと転がり軸受との間に絶縁材を挿入するようにしたものである。
【図2】 この発明の一実施の形態である回転電機の軸受部の構造を示す図である。
【図3】 この発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。
【図4】 この発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。
【図5】 この発明の一実施の形態に係る回転電機の軸受部の構造を示す図であり、転がり軸受の外輪に凹部を設けたものである。
【図6】 この発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。
【図7】この発明の一実施の形態に係る回転電機の軸受部の構造を示す図である。
【図8】 例えば特開平10−75551号公報に示された従来のファン駆動用モータの構造を示す図である。
【図9】 例えば特開平10−75551号公報に示された従来のファン駆動用モータの構造を示す図である。
【図10】 例えば特開平10−75551号公報に示された従来の転がり軸受の構造を示す図である。
【符号の説明】
1a,1b,1c 軸受ブラケット、 2a,2b 絶縁材、 3 転がり軸受、 4 押え板またはプレロードスプリング、 5a,5b,5c,5d,5e,5f 軸受ブラケット1a,1b,1cに設けられた凹部、 6a,6b,6c,6d 絶縁材2a,2bに設けられた凸部、 11 軸受ブラケット、 12 回転軸、 13 回転軸12の小径部、 14 回転軸12の段部、 15 絶縁材、 16a,16b 回転軸12に設けられた凹部、 17a,17b 絶縁材15に設けられた凸部、 18 絶縁材15に設けられたテーパ部、20 Oリング、 21 絶縁ワッシャー、 22 転がり軸受、 23 転がり軸受22の外輪に設けられた凹部、 24 回転軸、 25 回転軸24の小径部、 26 回転軸24の段部、 27 小径部25の外周面に設けられた凹部、 28 絶縁ワッシャー、 29 Oリング、 30 転がり軸受、 31 転がり軸受30の内周面に設けられた凹部、 32 Oリング、 33 絶縁ワッシャー、 41a,41b ファン駆動用電動モータ、 42 金属製のモータケース、 43 転がり軸受、 44 回転軸、 45 ケース本体、 46 前蓋、 47 後蓋、 48 前蓋46の保持段部、 49 後蓋47の保持凹部、 51 転がり軸受43の外輪、 52 転がり軸受43の内輪、 53 転動体、 54 波板ばね、 55 ロータ、 56 ステータ、 57小径部、 58 段部、 60a,60b 絶縁スリーブ、 61a,61b円筒部 、 62a,62b 大鍔部、 63a,63b 小鍔部、 71 係止凹溝、 72 絶縁スリーブ、 73 係止突状、 74 係止凹溝、 75 絶縁層、 76 Oリング。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine using a rolling bearing as a bearing, and more particularly to a rotating electrical machine such as an AC motor suitable as an inverter-driven induction motor.
[0002]
[Prior art]
When the inverter operation of an AC motor is performed, the carrier frequency of the inverter is set high for the purpose of reducing motor noise generated with switching.
As the carrier frequency is set higher, the voltage (shaft voltage) generated on the rotating shaft of the AC motor based on high frequency induction increases and exists between the inner ring and outer ring of the rolling bearing that supports the rotating shaft. Since the potential difference to be increased becomes large, current easily flows through the rolling bearing. The current flowing in the rolling bearing has a problem in that the durability of the rolling bearing is deteriorated by causing corrosion called electric corrosion on both the inner ring and outer ring raceways and the rolling surfaces of the rolling elements.
[0003]
FIG. 8 is a diagram showing the structure of a conventional fan driving motor disclosed in, for example, Japanese Patent Application Laid-Open No. 10-75551, and prevents current from flowing through a rolling bearing provided between a rotating shaft and a motor case. The purpose is to prevent the occurrence of electrolytic corrosion in the rolling bearing.
[0004]
In the figure, 41a is an electric motor for driving a fan, a metal motor case 42, and a metal rotary shaft 44 rotatably supported inside the motor case 42 via a pair of rolling bearings 43, 43. Have The motor case 42 includes a cylindrical case main body (frame) 45, a front lid 46 that closes the front end opening of the case main body 45, and a rear lid 47 that closes the rear end opening of the case main body 45. 48 is a holding step portion of the front lid 46, and 49 is a holding recess portion of the rear lid 47.
[0005]
51 is an outer ring of the rolling bearing 43, 52 is an inner ring of the rolling bearing 43, and 53 is a rolling element provided between the outer ring raceway on the inner peripheral surface of the outer ring 51 and the inner ring raceway on the outer peripheral surface of the inner ring 52. is there. A corrugated leaf spring 54 is sandwiched between the inner surface of the holding recess 49 and the end surface of the outer ring 51 of the rolling bearing 43 fitted in the holding recess 49 and presses the outer ring 51 toward the other outer ring 51.
55 is a rotor (rotor) and 56 is a stator (stator). 57 is a small-diameter portion formed at both ends of the rotating shaft 44, and 58 is a step portion formed on the outer peripheral surface of the rotating shaft 44.
[0006]
The inner rings 52 of the pair of rolling bearings 43 are externally fixed around the small diameter portions 57 formed at both ends of the rotating shaft 44 via insulating sleeves 60a. The insulating sleeve 60a is made of an insulating material such as hard rubber or synthetic resin, and is formed in a substantially cylindrical shape with an L-shaped cross section. That is, the insulating sleeve 60a has a large flange portion 62a at one end edge of the outer peripheral surface of the cylindrical portion 61a that can be fitted to the small diameter portion 57, and a small flange portion 63a at the other end edge of the outer peripheral surface.
[0007]
The large collar portion 62 a is externally fitted to the rotating shaft 44 with the stepped portion 58 formed on the outer peripheral surface of the rotating shaft 44 being opposed thereto.
The large collar portion 62a is sandwiched between one end surface of the inner ring 52 and the step portion 58 in a state where the inner ring 52 externally fitted to the insulating sleeve 60a is supported on the rotating shaft 44, and the one end surface and the step portion of the inner ring 52 are sandwiched between them. 58 is prevented from coming into contact. The cylindrical portion 61a is sandwiched between the inner peripheral surface of the inner ring 52 and the outer peripheral surface of the small-diameter portion 63a, and prevents these peripheral surfaces from coming into contact with each other. Further, the small collar portion 63a engages with the inner peripheral edge of the other end surface of the inner ring 52 to prevent the inner ring 52 and the insulating sleeve 60a from being inadvertently separated.
[0008]
Since the attachment portion between the inner ring 52 constituting the rolling bearing 43 that supports the rotating shaft 44 and the rotating shaft 44 that is a member holding the inner ring 52 is insulated, the electric potential of the rotating shaft 44 is set to the motor case 42. Even if the potential becomes higher than the electric potential, no current flows through the rolling bearing 43 including the inner ring 52.
Even if a shaft voltage is induced in the rotating shaft 44 based on the high-frequency current applied from the inverter to the stator 56, no current flows between the rotating shaft 44 and the motor case 42. Will not occur.
[0009]
FIG. 9 is a diagram showing the structure of a conventional fan driving motor disclosed in, for example, Japanese Patent Application Laid-Open No. 10-75551. A front lid or a rear lid in which outer rings of a pair of rolling bearings are formed at both ends of a motor case. The inside of the holding recess is fitted and fixed via an insulating sleeve.
[0010]
In the figure, reference numerals 42 to 49 and 51 to 59 are the same as those in FIG. 41b is an electric motor for driving the fan, 60b is an insulating sleeve, 61b is a cylindrical part, 62b is a large collar part, and 63b is a small collar part.
[0011]
Further, since the mounting portion between the outer rings 51 and 51 constituting the rolling bearings 43 and 43 that support the rotating shaft 44 and the motor case 42 that is a member holding the outer rings 51 and 51 is insulated, the rotating shaft Even if the electric potential of 44 becomes higher than the electric potential of the motor case 42, no current flows through the rolling bearings 43, 43 including the outer rings 51, 51, and no electrolytic corrosion occurs in the rolling bearing 43.
[0012]
FIG. 10 is a diagram showing the structure of a conventional rolling bearing disclosed in, for example, Japanese Patent Application Laid-Open No. 10-75551, between the outer ring of the rolling bearing and the holding step or holding recess, or the inner ring and the rotating shaft of the rolling bearing. The structure of the insulating sleeve or insulating layer provided between the two is shown.
[0013]
In the drawing, (a) shows that the locking grooves 71, 71 are formed on the outer peripheral surface (or inner peripheral surface) and one end surface of the outer ring of the rolling bearing. The formed locking projections 73 and 73 are engaged to prevent separation of the outer ring and the insulating sleeve.
[0014]
In the figure, (b) shows that a plurality of locking grooves 74, 74 are formed over the entire circumference on the outer ring outer peripheral surface (or inner ring inner peripheral surface) of the rolling bearing, and the outer peripheral surface and both end surfaces of the outer ring. Further, an insulating layer 75 such as a baked film of a fluorine resin such as polytetrafluoroethylene (PTFE) is formed. Further, O-rings 76 and 76 made of an elastic material such as rubber such as nitrile or thermoplastic elastomer are attached to the respective locking grooves 74 and 74.
With the outer ring fitted into the holding step or holding recess, these O-rings frictionally engage with the inner peripheral surface of the holding step or holding recess, and the outer ring rotates inside the holding step or holding recess ( Prevent creep.
[0015]
[Problems to be solved by the invention]
In the conventional motor as shown in FIG. 8 and FIG. 9, an insulating sleeve or insulating layer is provided between the outer ring of the rolling bearing and the holding step or holding recess, or between the inner ring of the rolling bearing and the rotating shaft. By preventing the electric current from flowing through the rolling bearing provided between the rotating shaft and the motor case and preventing the electric corrosion from occurring in the rolling bearing, the rolling bearing and the insulating sleeve In order to prevent separation, it is necessary to fit firmly together, and there is a problem that workability in motor assembly is poor.
[0016]
Further, in FIG. 10, in order to prevent separation between the rolling bearing and the insulating sleeve, the outer peripheral surface and one end surface of the outer ring (or inner ring) of the rolling bearing are engaged with locking protrusions formed on the insulating sleeve. Therefore, there is a problem in that a locking groove to be formed must be formed, and a rolling bearing having a special shape must be used.
[0017]
The present invention has been made to solve the above-described problems, and prevents electric current from flowing through the rolling bearing provided between the rotating shaft and the motor case, so that electric corrosion is generated in the rolling bearing. Thus, a rotating electrical machine that can be easily assembled with a simple configuration can be obtained.
[0018]
[Means for Solving the Problems]
A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator with a slight gap, and the rotor is fixed and freely rotatable via a rolling bearing. In the rotating electrical machine having a rotating shaft supported by the bearing and a bearing bracket that supports the rolling bearing via an insulating material, an outer peripheral surface of the outer ring of the rolling bearing on the side of the bearing bracket in contact with the insulating material ; A concave portion is provided on the corresponding side and the side corresponding to the side surface of the outer ring of the rolling bearing and on the contact surface of the preload spring, and the convex portion of the insulating material is provided with a convex portion corresponding to the concave portion of the bearing bracket. It fits into the concave part of the bracket and is fixed.
[0024]
In addition, a stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, and the rotor are fixed, via a rolling bearing In a rotating electrical machine having a rotating shaft that is rotatably supported and a bearing bracket that supports the rolling bearing via an O-ring, a recess for inserting the O-ring on a side of the bearing bracket that contacts the O-ring And an insulating washer is provided between the side surface of the outer ring of the rolling bearing and the bearing bracket.
[0025]
A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, a rotating shaft to which the rotor is fixed, and an O In a rotating electrical machine having a rolling bearing that rotatably supports the rotating shaft via a ring and a bearing bracket that supports the rolling bearing, the O-ring is inserted on a side of the rotating shaft that supports the rolling bearing. And an insulating washer is provided between the side surface of the inner ring of the rolling bearing and the step portion of the rotating shaft.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a view showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention, in which an insulating material is inserted between a bearing bracket and a rolling bearing. A recess is provided on the side of the bearing bracket that comes into contact with the insulating material, and a convex portion corresponding to the concave portion of the bearing bracket is provided on the insulating material, and the convex portion of the insulating material is fitted and fixed to the concave portion of the bearing bracket. is there.
[0027]
In the figure, 1a is a bearing bracket constituting a case body (not shown) such as a frame and a motor case (not shown), 2a is an insulating material made of Teflon, nitrile rubber, silicon rubber or the like, 3 is a rolling bearing, 4 Is a presser plate or a preload spring. Here, the bearing bracket 1a corresponds to the front lid 46 and the rear lid 47 described in the conventional example.
5a and 5b are concave portions provided on the side of the bearing bracket 1a that contacts the insulating material 2a, and 6a and 6b are convex portions provided on the insulating material 2a, corresponding to the concave portions 5a and 5b provided on the bearing bracket 1a. Is. The recessed part 5a is a recessed part provided on the fitting side with the rolling bearing, and the recessed part 5b is a recessed part provided on the side surface side of the outer ring of the rolling bearing and on a contact surface such as a press plate or a preload spring.
Further, 44 is a rotation shaft, 57 is a small diameter portion of the rotation shaft 44, and 58 is a step portion of the rotation shaft 44.
[0028]
FIG. 2 is a view showing the structure of the bearing portion of the rotating electrical machine according to the embodiment of the present invention. In the figure, 1b is a bearing bracket that constitutes a case body (not shown) such as a frame and a motor case (not shown), 2b is an insulating material made of Teflon, nitrile rubber, silicon rubber or the like, 3 is a rolling bearing, 4 Is a presser plate or a preload spring.
5c and 5d are concave portions provided on the side of the bearing bracket 1b in contact with the insulating material 2b, and 6c and 6d are convex portions provided on the insulating material 2b, which correspond to the concave portions 5c and 5d provided on the bearing bracket 1b. Is. The recesses 5c and 5d are recesses provided on the fitting side with the rolling bearing.
Further, 44 is a rotation shaft, 57 is a small diameter portion of the rotation shaft 44, and 58 is a step portion of the rotation shaft 44.
[0029]
At the time of assembly, the insulating materials 2a and 2b only have to be fitted to the bearing brackets 1a and 1b. By being pushed by the outer ring of the rolling bearing 3, a holding plate or a preload spring, the concave portions of the bearing bracket and the convex portions of the insulating material are Can be fixed stably.
[0030]
In this embodiment, a concave portion is provided on the side of the bearing bracket that contacts the insulating material, and a convex portion corresponding to the concave portion of the bearing bracket is provided on the insulating material, and the convex portion of the insulating material is fitted into the concave portion of the bearing bracket. Since it is fixed, it does not deviate even if Teflon, nitrile rubber, silicon rubber or the like is used as an insulating material, and can be stably maintained for a long time.
In addition, since the insulating material is fixed using the concave portion provided in the bearing bracket and the convex portion provided in the insulating material, a rolling bearing equivalent to that generally used can be used.
[0031]
Embodiment 2. FIG.
FIG. 3 is a diagram showing the structure of the bearing portion of the rotating electrical machine according to the embodiment of the present invention. In the figure, 3 is a rolling bearing, 4 is a presser plate or preload spring, 11 is a bearing bracket, 12 is a rotating shaft, 13 is a small diameter portion of the rotating shaft 12, 14 is a step portion of the rotating shaft 12, and 15 is Teflon or nitrile rubber. Insulating material made of silicon rubber or the like.
Reference numerals 16a and 16b denote recesses provided on the side of the rotating shaft 12 in contact with the insulating material 15, and reference numerals 17a and 17b denote convex portions provided on the insulating material 15, which correspond to the recesses 16a and 16b provided on the rotating shaft 12. Is. The recessed part 16a is a recessed part provided on the step part side of the rotating shaft 12, and 16b is a recessed part provided on the fitting side with the rolling bearing.
Reference numeral 18 denotes a tapered portion provided in the insulating material 15.
[0032]
In order to prevent idling of the inner ring of the rolling bearing, the insulating material needs to be tightly fitted, and a hard material is used. Further, it is preferable that the rolling bearing is tapered so as to be easily press-fitted, and a knurling process or the like for preventing slipping is performed on a fitting portion between the rotating shaft and the inner ring.
[0033]
In this embodiment, a concave portion is provided on the side of the rotating shaft that contacts the insulating material, and a convex portion corresponding to the concave portion of the rotating shaft is provided on the insulating material, and the convex portion of the insulating material is fitted into the concave portion of the rotating shaft. Since it is fixed, it does not deviate even if Teflon, nitrile rubber, silicon rubber or the like is used as an insulating material, and can be stably maintained for a long time.
In addition, since the insulating material is fixed using the concave portion provided on the rotating shaft and the convex portion provided on the insulating material, a rolling bearing equivalent to that generally used can be used.
[0034]
Embodiment 3 FIG.
FIG. 4 is a diagram showing the structure of the bearing portion of the rotating electrical machine according to the embodiment of the present invention. In the figure, 1c is a bearing bracket constituting a case body (not shown) such as a frame and a motor case (not shown), 3 is a rolling bearing, and 4 is a press plate or a preload spring. 5e and 5f are recesses provided in the bearing bracket 1c, 20 is an O-ring, and 21 is an insulating washer.
Further, 44 is a rotation shaft, 57 is a small diameter portion of the rotation shaft 44, and 58 is a step portion of the rotation shaft 44.
[0035]
The bearing bracket 1c is provided with recesses 5e and 5f as O-ring grooves to support and fix the outer peripheral surface of the outer ring of the rolling bearing 3 via the O-ring 20, and between the side surface of the outer ring of the rolling bearing 3 and the preload spring. An insulating washer is provided.
[0036]
The O-ring is generally an insulator made of elastic rubber or plastic. An O-ring groove is provided in a concave shape in the bearing bracket, and an O-ring is fitted therein, but is set so that a slight gap is formed between the rolling bearing and the bearing bracket when the rolling bearing is inserted.
Although the frictional force of the O-ring contact portion is quite strong, it may slip due to the presence of grease or the like. As a countermeasure, a knurl-like unevenness can be provided in the inner ring of the bearing and the O-ring groove of the shaft.
[0037]
Since the rolling bearing 3 is insulated from the bearing bracket 1c by the O-ring 20 and the insulating washer 21, the current is prevented from flowing through the rolling bearing provided between the rotating shaft and the bearing bracket constituting the motor case. It is possible to prevent electric corrosion from occurring in the rolling bearing.
[0038]
The insulating washer can be fixed stably because an appropriate pressure is always applied by the preload spring.
In addition, the O-ring is held around the rolling bearing and has the effect of preventing rotation. Furthermore, by using the O-ring, there is no backlash, and vibration noise due to the electromagnetic force of the stator windings can be transmitted through the bearing. Therefore, a low noise rotating electric machine can be realized.
[0039]
FIG. 5 is a view showing the structure of the bearing portion of the rotating electrical machine according to the embodiment of the present invention, in which a recess is provided in the outer ring of the rolling bearing. In the figure, 4 is a pressing plate or preload spring, and 11 is a bearing bracket that constitutes a case body (not shown) such as a frame and a motor case (not shown). 20 is an O-ring, 21 is an insulating washer, 22 is a rolling bearing, and 23 is a recess provided in the outer ring of the rolling bearing 22 as an O-ring groove.
Further, 44 is a rotation shaft, 57 is a small diameter portion of the rotation shaft 44, and 58 is a step portion of the rotation shaft 44.
[0040]
Embodiment 4 FIG.
FIG. 6 is a view showing the structure of the bearing portion of the rotating electrical machine according to the embodiment of the present invention. In the figure, 3 is a rolling bearing, 4 is a pressing plate or a preload spring, and 11 is a bearing bracket that constitutes a case body (not shown) such as a frame and a motor case (not shown). Reference numeral 24 denotes a rotating shaft, 25 denotes a small diameter portion of the rotating shaft 24, 26 denotes a step portion of the rotating shaft 24, and 27 denotes a recess provided as an O-ring groove on the outer peripheral surface of the small diameter portion 25. 28 is an insulating washer, and 29 is an O-ring.
[0041]
A concave portion 27 is provided as an O-ring groove on the outer peripheral surface of the small-diameter portion 25 of the rotary shaft 24, and an O-ring 29 is attached to the concave portion 27, and a slight amount is provided between the rotary shaft 24 and the inner peripheral surface of the inner ring of the rolling bearing 3. Set to create a gap. Further, an insulating washer 28 is mounted between the side surface of the inner ring of the rolling bearing 3 and the step portion 26 of the rotating shaft 24.
[0042]
Since the rolling bearing 3 is insulated from the rotating shaft 24 by the insulating washer 28 and the O-ring 29, current is prevented from flowing through the rolling bearing provided between the rotating shaft and the bearing bracket constituting the motor case. It is possible to prevent electric corrosion from occurring on the bearing.
[0043]
FIG. 7 is a view showing the structure of the bearing portion of the rotating electrical machine according to the embodiment of the present invention. In the figure, 4 is a pressing plate or preload spring, and 11 is a bearing bracket that constitutes a case body (not shown) such as a frame and a motor case (not shown). Reference numeral 30 is a rolling bearing, 31 is a recess provided as an O-ring groove on the inner peripheral surface of the rolling bearing 30, 32 is an O-ring, and 33 is an insulating washer.
Further, 44 is a rotation shaft, 57 is a small diameter portion of the rotation shaft 44, and 58 is a step portion of the rotation shaft 44.
[0044]
FIG. 6 shows an example in which the outer peripheral surface of the small-diameter portion of the rotating shaft is provided with a recess for an O-ring that is mounted so that a slight gap is formed between the rotating shaft and the inner peripheral surface of the inner ring of the rolling bearing. FIG. 7 shows an O-ring recess provided on the inner peripheral surface of the inner ring of the rolling bearing.
[0045]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0046]
A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator with a slight gap, and the rotor is fixed and freely rotatable via a rolling bearing. In the rotating electrical machine having a rotating shaft supported by the bearing and a bearing bracket that supports the rolling bearing via an insulating material, an outer peripheral surface of the outer ring of the rolling bearing on the side of the bearing bracket in contact with the insulating material ; A concave portion is provided on the corresponding side and the side corresponding to the side surface of the outer ring of the rolling bearing and on the contact surface of the preload spring, and the convex portion of the insulating material is provided with a convex portion corresponding to the concave portion of the bearing bracket. since as is fitted into the concave portion of the bracket is fixed, typically by using the equivalent of a rolling bearing to that used, current rolling bearing provided between the rotary shaft and the motor case In a configuration to prevent the flowing, easy rotary electric machine assembly is obtained.
[0052]
In addition, a stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, and the rotor are fixed, via a rolling bearing In a rotating electrical machine having a rotary shaft that is rotatably supported and a bearing bracket that supports the rolling bearing via an O-ring, a recess for inserting the O-ring on a side of the bearing bracket that contacts the O-ring Since an insulating washer is provided between the side surface of the outer ring of the rolling bearing and the bearing bracket, a rotating electrical machine that is easy to assemble with a simple configuration without using an insulating material provided with a convex portion is provided. can get.
[0053]
A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, a rotating shaft to which the rotor is fixed, and an O In a rotating electrical machine having a rolling bearing that rotatably supports the rotating shaft via a ring and a bearing bracket that supports the rolling bearing, the O-ring is inserted on a side of the rotating shaft that supports the rolling bearing. Since the insulating washer is provided between the side surface of the inner ring of the rolling bearing and the step portion of the rotating shaft, the assembly can be performed with a simple configuration without using the insulating material provided with the convex portion. An easy rotating electrical machine can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention, in which an insulating material is inserted between a bearing bracket and a rolling bearing.
FIG. 2 is a diagram showing a structure of a bearing portion of a rotating electrical machine that is an embodiment of the present invention.
FIG. 3 is a diagram showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention.
FIG. 4 is a diagram showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention.
FIG. 5 is a view showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention, in which a concave portion is provided on an outer ring of a rolling bearing.
FIG. 6 is a diagram showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention.
FIG. 7 is a view showing a structure of a bearing portion of a rotating electrical machine according to an embodiment of the present invention.
FIG. 8 is a diagram showing the structure of a conventional fan driving motor disclosed in, for example, Japanese Patent Laid-Open No. 10-75551.
FIG. 9 is a diagram showing the structure of a conventional fan driving motor disclosed in, for example, Japanese Patent Laid-Open No. 10-75551.
FIG. 10 is a diagram showing a structure of a conventional rolling bearing disclosed in, for example, Japanese Patent Laid-Open No. 10-75551.
[Explanation of symbols]
1a, 1b, 1c Bearing bracket, 2a, 2b Insulating material, 3 Rolling bearing, 4 Presser plate or preload spring, 5a, 5b, 5c, 5d, 5e, 5f Recessed portion provided in bearing bracket 1a, 1b, 1c, 6a , 6b, 6c, 6d Protruding portions provided on the insulating materials 2a, 2b, 11 bearing bracket, 12 rotating shaft, 13 small diameter portion of the rotating shaft 12, 14 step portion of the rotating shaft 12, 15 insulating material, 16a, 16b rotation Concave portion provided on the shaft 12, 17a, 17b Convex portion provided on the insulating material 15, 18 Tapered portion provided on the insulating material 15, 20 O-ring, 21 Insulating washer, 22 Rolling bearing, 23 Outer ring of the rolling bearing 22 24, a rotating shaft, 25 a small diameter portion of the rotating shaft 24, 26 a step portion of the rotating shaft 24, 27 a recessed portion provided on the outer peripheral surface of the small diameter portion 25, 28 Insulating washers, 29 O-rings, 30 Rolling bearings, 31 Recesses provided on the inner peripheral surface of the rolling bearings 30, 32 O-rings, 33 Insulating washers, 41a, 41b Electric motors for driving fans, 42 Metal motor cases, 43 Rolling bearing, 44 Rotating shaft, 45 Case body, 46 Front lid, 47 Rear lid, 48 Holding step of front lid 46, 49 Holding recess of rear lid 47, 51 Outer ring of rolling bearing 43, 52 Inner ring of rolling bearing 43 53 rolling elements, 54 corrugated leaf springs, 55 rotors, 56 stators, 57 small diameter parts, 58 stepped parts, 60a, 60b insulating sleeves, 61a, 61b cylindrical parts, 62a, 62b large collar parts, 63a, 63b small collar parts, 71 Locking groove, 72 Insulating sleeve, 73 Locking protrusion, 74 Locking groove, 75 Insulating layer, 76 O-ring.

Claims (3)

コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着され、転がり軸受を介して回転自在に支承される回転軸と、絶縁材を介して前記転がり軸受を支持する軸受ブラケットと、を有する回転電機において、
前記軸受ブラケットの前記絶縁材と接触する側の前記転がり軸受の外輪の外周面と対応する側および前記転がり軸受の外輪の側面と対応する側であってプレロードスプリングの当たり面に凹部を設け、前記軸受ブラケットの凹部に対応する凸部を設けた絶縁材の凸部を、前記軸受ブラケットの凹部に勘合し固定するようにしたことを特徴とする回転電機。
A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, and the rotor is fixed, and is rotatable through a rolling bearing. In a rotating electrical machine having a rotating shaft supported by a bearing bracket and a bearing bracket that supports the rolling bearing via an insulating material,
A recess corresponding to a side corresponding to an outer peripheral surface of the outer ring of the rolling bearing and a side corresponding to a side surface of the outer ring of the rolling bearing on the side contacting the insulating material of the bearing bracket; A rotating electrical machine characterized in that a convex portion of an insulating material provided with a convex portion corresponding to a concave portion of a bearing bracket is fitted into and fixed to the concave portion of the bearing bracket.
コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着され、転がり軸受を介して回転自在に支承される回転軸と、Oリングを介して前記転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記軸受ブラケットの前記Oリングと接触する側に前記Oリングを挿入する凹部を設けるとともに、前記転がり軸受の外輪の側面と前記軸受ブラケットとの間に絶縁ワッシャーを設けたことを特徴とする回転電機。A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, and the rotor is fixed, and is rotatable through a rolling bearing. In a rotating electrical machine having a rotating shaft supported by a bearing and a bearing bracket that supports the rolling bearing via an O-ring, a recess for inserting the O-ring is provided on a side of the bearing bracket that contacts the O-ring. In addition, the rotating electrical machine is characterized in that an insulating washer is provided between a side surface of the outer ring of the rolling bearing and the bearing bracket. コイルが巻回されてなる固定子と、この固定子を固定するフレームと、前記固定子とわずかな空隙を介して対向する回転子と、この回転子が固着される回転軸と、Oリングを介してこの回転軸を回転自在に支承する転がり軸受と、この転がり軸受を支持する軸受ブラケットと、を有する回転電機において、前記回転軸の前記転がり軸受を支持する側に前記Oリングを挿入する凹部を設けるとともに、前記転がり軸受の内輪の側面と前記回転軸の段部との間に絶縁ワッシャーを設けたことを特徴とする回転電機。A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator via a slight gap, a rotating shaft to which the rotor is fixed, and an O-ring In a rotating electrical machine having a rolling bearing that rotatably supports the rotating shaft via a bearing bracket that supports the rolling bearing, a recess for inserting the O-ring on the side of the rotating shaft that supports the rolling bearing And an insulating washer provided between the side surface of the inner ring of the rolling bearing and the step portion of the rotating shaft.
JP32650498A 1998-11-17 1998-11-17 Rotating electric machine Expired - Fee Related JP3635948B2 (en)

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