JP2005033999A - Electric motor for fan drive - Google Patents

Electric motor for fan drive Download PDF

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Publication number
JP2005033999A
JP2005033999A JP2004260439A JP2004260439A JP2005033999A JP 2005033999 A JP2005033999 A JP 2005033999A JP 2004260439 A JP2004260439 A JP 2004260439A JP 2004260439 A JP2004260439 A JP 2004260439A JP 2005033999 A JP2005033999 A JP 2005033999A
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Prior art keywords
ring
motor
rotating shaft
case
motor case
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JP2004260439A
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Japanese (ja)
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Toshio Takahashi
利夫 高橋
Shunichi Yabe
俊一 矢部
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Nsk Ltd
日本精工株式会社
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Priority to JP2004260439A priority Critical patent/JP2005033999A/en
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    • 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
    • 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
    • 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
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2202/00Solid materials defined by their properties
    • F16C2202/30Electric properties; Magnetic properties
    • 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
    • F16C2226/00Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50Positive connections
    • 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
    • F16C2380/00Electrical apparatus
    • F16C2380/26Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a current from flowing in rolling bearings 3, 3 so as to prevent electric corrosion from its generation in component parts of each of these rolling bearings 3, 3, even when the electric potential of a rotary shaft 4 is increased higher than that of a motor case 2, by allowing a current of high frequency to flow in a stator 19 by an inverter. <P>SOLUTION: An insulating material of insulating sleeves 24, 24, etc. is interposed in a circuit allowing a current to flow in the case that the electric potential of the rotary shaft 4 is high generated. As a result, the current is prevented from flowing in each of the rolling bearings 3, 3, so that the electric collosion can be prevented from its generation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、各種機器に組み込んで送風用のファンを回転駆動するファン駆動用電動モータのうち、インバータ運転を行なう交流モータの改良に関する。   The present invention relates to an improvement of an AC motor that performs inverter operation among electric motors for driving a fan that is incorporated in various devices and rotationally drives a fan for blowing air.
例えばエアコンディショナ用の送風用ファンを電動モータにより回転駆動する事が、一般的に行なわれている。又、風量調節の容易化を図る為、上記電動モータとして、インバータ運転を行なう交流モータを使用する事も、広く行なわれている。この様に交流モータのインバータ運転を行なう際に、インバータのキャリア周波数を高く設定すれば、スイッチングに伴って発生するモータ騒音の低減を図れる事が、従来から知られている。又、近年に於ける半導体素子の性能向上、並びに回路技術の向上により、上記キャリア周波数を高く設定する事が可能になってきた。この様な事情により、上記交流モータを駆動する為のインバータのキャリア周波数を高く設定する様になっている。   For example, a blower fan for an air conditioner is generally rotated by an electric motor. In order to facilitate air volume adjustment, an AC motor that performs inverter operation is widely used as the electric motor. It has been conventionally known that, when the inverter operation of an AC motor is performed in this way, the motor noise generated by switching can be reduced if the carrier frequency of the inverter is set high. In recent years, it has become possible to set the carrier frequency high by improving the performance of semiconductor elements and improving the circuit technology. Under such circumstances, the carrier frequency of the inverter for driving the AC motor is set high.
この様にキャリア周波数を高く設定するのに伴って、上記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)が増大する傾向になっている。そして、この軸電圧の増大に伴って、上記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り、上記転がり軸受内に電流が流れ易くなっている。この様な電流は、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、上記転がり軸受の耐久性を悪化させる。この様な事情に鑑みて従来は、例えば図7に示す様な構造により、上記電食の発生を防止していた。先ず、この図7により、本発明の対象となるファン駆動用電動モータの基本構造と従来の電食防止構造とに就いて説明する。   As the carrier frequency is set higher in this way, the voltage (axial voltage) generated on the rotating shaft of the AC motor based on high frequency induction tends to increase. As the shaft voltage increases, the potential difference existing between the inner ring and the outer ring of the rolling bearing that supports the rotating shaft increases, and current easily flows in the rolling bearing. Such a current causes corrosion called electric corrosion on the inner ring and outer ring raceways and the rolling surfaces of the rolling elements, thereby deteriorating the durability of the rolling bearing. In view of such circumstances, conventionally, for example, the structure shown in FIG. First, the basic structure of the electric motor for driving a fan and the conventional structure for preventing electric corrosion will be described with reference to FIG.
このファン駆動用電動モータ1は、金属製のモータケース2と、このモータケース2の内側に1対の転がり軸受3、3を介して回転自在に支持された金属製の回転軸4とを有する。上記モータケース2は、円筒状のケース本体5と、このケース本体5の前端(上記回転軸4の先端部が突出する側の端部で、図7の右端)開口を塞ぐ前蓋6と、上記ケース本体5の後端開口を塞ぐ後蓋7とから成る。このうち、前蓋6の中央部には、上記回転軸4の先端部を挿通する円孔8と、この円孔8の周囲を囲む保持段部9とを設け、上記後蓋7の中央部内面には有底円筒状の保持凹部10を設けている。上記各転がり軸受3、3は、これら保持段部9及び保持凹部10と、上記回転軸4の外周面との間に設けている。   The fan driving electric motor 1 has a metal motor case 2 and a metal rotating shaft 4 that is rotatably supported inside the motor case 2 via a pair of rolling bearings 3 and 3. . The motor case 2 includes a cylindrical case main body 5 and a front lid 6 that closes the opening of the front end of the case main body 5 (the end on the side from which the tip of the rotating shaft 4 protrudes is the right end in FIG. 7), The rear cover 7 closes the rear end opening of the case body 5. Among these, the center part of the front lid 6 is provided with a circular hole 8 through which the tip of the rotary shaft 4 is inserted and a holding step 9 surrounding the circular hole 8. A bottomed cylindrical holding recess 10 is provided on the inner surface. Each of the rolling bearings 3 and 3 is provided between the holding step portion 9 and the holding concave portion 10 and the outer peripheral surface of the rotating shaft 4.
即ち、上記各転がり軸受3、3を構成する外輪11、11を上記保持段部9又は保持凹部10に内嵌し、同じく内輪12、12を上記回転軸4に外嵌している。又、これら各内輪12、12の互いに対向する端面は、上記回転軸4の中間部に形成した段部13、13に突き当てている。又、上記保持凹部10の奥面とこの保持凹部10に内嵌した外輪11の端面との間には、波板ばね14等の弾性材を挟持して、この外輪11を他方(図7の右方)の外輪11に向け押圧している。従って、これら各外輪11、11の内周面の外輪軌道15、15と上記各内輪12、12の外周面の内輪軌道16、16との間にそれぞれ複数個ずつ設けた転動体17、17には、上記弾性材の弾力に応じた予圧が付与されている。この結果、上記回転軸4は上記モータケース2の内側に、がたつきなく、回転自在に支持されている。   That is, the outer rings 11, 11 constituting the respective rolling bearings 3, 3 are fitted into the holding step 9 or the holding recess 10, and the inner rings 12, 12 are similarly fitted to the rotating shaft 4. Moreover, the mutually opposing end surfaces of the inner rings 12, 12 abut against stepped portions 13, 13 formed in the intermediate portion of the rotating shaft 4. Further, an elastic material such as a corrugated spring 14 is sandwiched between the inner surface of the holding recess 10 and the end face of the outer ring 11 fitted in the holding recess 10, and the outer ring 11 is connected to the other (see FIG. 7). It is pressing toward the outer ring 11 on the right side. Accordingly, a plurality of rolling elements 17, 17 are provided between the outer ring raceways 15, 15 on the inner peripheral surface of each outer ring 11, 11 and the inner ring raceways 16, 16 on the outer peripheral surface of each inner ring 12, 12. Is applied with a preload corresponding to the elasticity of the elastic material. As a result, the rotating shaft 4 is rotatably supported on the inner side of the motor case 2 without rattling.
この様な回転軸4の中間部外周面にはロータ18を固定し、上記ケース本体5の内周面にはステータ19を固定して、これらロータ18の外周面とステータ19の内周面とを対向させている。又、このステータ19には、図示しないインバータから高周波交流を印加自在としている。送風ファンを回転駆動させる際には、上記ステータ19にインバータから交流電流を流し、上記回転軸4を回転させて、この回転軸4に固定したファンを回転駆動する。   The rotor 18 is fixed to the outer peripheral surface of the intermediate part of the rotating shaft 4 and the stator 19 is fixed to the inner peripheral surface of the case body 5. The outer peripheral surface of the rotor 18 and the inner peripheral surface of the stator 19 are Are facing each other. Further, high frequency alternating current can be applied to the stator 19 from an inverter (not shown). When the blower fan is rotationally driven, an alternating current is passed through the stator 19 from the inverter, the rotary shaft 4 is rotated, and the fan fixed to the rotary shaft 4 is rotationally driven.
この様なインバータ式の交流モータの場合には、前述した様に回転軸4に軸電圧が発生し、何れも金属(軸受鋼)製の外輪11と内輪12と転動体17、17とにより構成される転がり軸受3、3、モータケース2、このモータケース2が固定されたモータベース、及びこのモータベースが固定された定盤等を通って、大地に電流が流れ、上記転がり軸受3、3に、前述した電食と呼ばれる腐食を発生させる。この様な腐食を防止する為に従来から、次の(1) 〜(3) に示す様な方法が採られていた。
(1) 図7に示す様に、モータケース2と回転軸4との間に、導電材製の腕21と板ばね22とにより支持されたブラシ20を設けて、これら両部材2、4同士を導通させ、上記各転がり軸受3、3に電流が流れるのを防止する。
(2) 上記各転がり軸受3、3に封入する為のグリースとして導電性グリースを使用し、これら各転がり軸受3、3を流れる電流が外輪、内輪両軌道15、16や転動体17、17の転動面を電流が流れない様にする。
(3) 上記各転がり軸受3、3に封入する為のグリースとして、基油の粘度の高いものを使用し、これら各転がり軸受3、3の外輪、内輪両軌道15、16と転動体17、17の転動面との間に形成される油膜の厚さを大きくして、これら外輪、内輪両軌道15、16や転動体17、17の転動面を電流が流れない様にする。
In the case of such an inverter-type AC motor, a shaft voltage is generated on the rotating shaft 4 as described above, and each is constituted by an outer ring 11 made of metal (bearing steel), an inner ring 12 and rolling elements 17 and 17. Through the rolling bearings 3 and 3, the motor case 2, the motor base to which the motor case 2 is fixed, the surface plate to which the motor base is fixed, and the like. Further, the above-described corrosion called electric corrosion is generated. In order to prevent such corrosion, conventionally, the following methods (1) to (3) have been adopted.
(1) As shown in FIG. 7, a brush 20 supported by an arm 21 made of a conductive material and a leaf spring 22 is provided between the motor case 2 and the rotating shaft 4, and the two members 2, 4 are connected to each other. To prevent current from flowing through each of the rolling bearings 3 and 3.
(2) Conductive grease is used as the grease to be enclosed in each of the rolling bearings 3, 3, and the current flowing through each of the rolling bearings 3, 3 is applied to the outer ring and inner ring raceways 15, 16 and the rolling elements 17, 17. Prevent current from flowing through the rolling surface.
(3) A grease having a high base oil viscosity is used as the grease to be enclosed in each of the rolling bearings 3 and 3, and the outer ring and inner ring raceways 15 and 16 of the rolling bearings 3 and 3, and the rolling elements 17, The thickness of the oil film formed between the 17 and 17 rolling surfaces is increased so that no current flows through the outer ring and inner ring raceways 15 and 16 and the rolling surfaces of the rolling elements 17 and 17.
上述の様な従来の電食防止方法のうち、(1) のブラシ20を使用する方法の場合には、回転軸4の先端部にファンを固定する必要上、ブラシ20を設置するスペースの確保が難しかったり、或はブラシ20の摩耗粉が周囲環境を汚染する為、実施が困難な場合がある。
又、(2) の導電性グリースを使用する方法の場合には、コストが嵩む上、運転騒音が大きくなる。即ち、導電性グリースは、炭素粉等の導電性粉末を混入している為、この粉末が外輪、内輪両軌道15、16と転動体17、17の転動面との間に噛み込まれる事で運転騒音が大きくなる。又、この様な特殊なグリースを使用する事により、コストが嵩む。 更に、(3) の高粘度のグリースを使用する方法では、転がり軸受3、3の回転抵抗が増大し、運転時の温度上昇が著しくなる。又、これら転がり軸受3、3を通過しようとする電流が高周波電流であると、油膜厚さ程度の絶縁層を通過する為、電食防止効果が不十分となる。しかも、グリース自体の経時劣化やグリース中への異物の進入により、油膜の形成状態が変化し、電気的な導通状態と絶縁状態とが交互に出現して、電食が発生する可能性がある等、十分な対策とはなり得ない。
本発明のファン駆動用電動モータは、この様な不都合を何れも解消すべく発明したものである。
Of the conventional methods for preventing electric corrosion as described above, in the method using the brush 20 of (1), it is necessary to fix a fan to the tip of the rotating shaft 4 and to secure a space for installing the brush 20. It may be difficult to carry out, or it may be difficult to carry out because the abrasion powder of the brush 20 contaminates the surrounding environment.
In the case of the method (2) using the conductive grease, the cost is increased and the operation noise is increased. That is, since the conductive grease is mixed with conductive powder such as carbon powder, the powder is caught between the outer ring and inner ring raceways 15 and 16 and the rolling surfaces of the rolling elements 17 and 17. Driving noise increases. In addition, the use of such special grease increases the cost. Furthermore, in the method (3) using the high-viscosity grease, the rotational resistance of the rolling bearings 3 and 3 increases, and the temperature rise during operation becomes significant. Further, if the current passing through the rolling bearings 3 and 3 is a high-frequency current, the effect of preventing electrolytic corrosion is insufficient because it passes through an insulating layer having an oil film thickness. Moreover, due to the deterioration of the grease itself over time and the entry of foreign matter into the grease, the oil film formation state changes, and the electrical conduction state and the insulation state appear alternately, which may cause electric corrosion. It cannot be a sufficient measure.
The electric motor for driving the fan of the present invention was invented to eliminate all of these disadvantages.
本発明のファン駆動用電動モータは、前述した従来のファン駆動用モータと同様に、金属製のモータケースと、このモータケースの内側に複数の転がり軸受を介して回転自在に支持された回転軸と、この回転軸に固定されたロータと、上記モータケースに固定されて上記ロータと対向するステータとを備える。そして、このステータにインバータから交流電流を流し、上記回転軸を回転させてこの回転軸に固定したファンを回転駆動する。
特に、本発明のファン駆動用電動モータに於いては、次の(a) 〜(c) の少なくとも1個所を絶縁する事により、上記各転がり軸受に電流が流れる事を防止する。
(a) 上記転がり軸受を構成する外輪とこの外輪を保持している部材との取付個所。
(b) 上記転がり軸受を構成する内輪とこの内輪を保持している部材との取付個所。
(c) 上記モータケースと、このモータケースを取付部位に固定すべく、このモータケースの外面に固定したモータベースとの取付個所。
The electric motor for driving the fan according to the present invention includes a metal motor case and a rotary shaft that is rotatably supported inside the motor case via a plurality of rolling bearings in the same manner as the conventional fan driving motor described above. And a rotor fixed to the rotating shaft, and a stator fixed to the motor case and facing the rotor. Then, an alternating current is supplied to the stator from the inverter, the rotating shaft is rotated, and the fan fixed to the rotating shaft is rotationally driven.
In particular, in the electric motor for driving a fan of the present invention, at least one of the following (a) to (c) is insulated to prevent current from flowing through each of the rolling bearings.
(a) A mounting portion between the outer ring constituting the rolling bearing and a member holding the outer ring.
(b) A mounting portion between the inner ring constituting the rolling bearing and a member holding the inner ring.
(c) A mounting portion between the motor case and the motor base fixed to the outer surface of the motor case in order to fix the motor case to the mounting site.
上述の様に構成される本発明の場合には、インバータからステータに印加される高周波電流に基づいて回転軸に軸電圧が惹起されても、この回転軸から大地への電流の流れを1個所以上で絶縁すれば、転がり軸受に電流が流れる事がない。
先ず、(a)(b)の構成を採用した場合には、外輪又は内輪と、これら外輪又は内輪を保持している部材との取付個所が絶縁されるので、これら外輪及び内輪を組み込んで成る転がり軸受に電流が流れる事がなくなる。
又、(c) の構成を採用した場合には、モータケースとモータベースとの取付個所が絶縁されるので、転がり軸受に電流が流れなくなる。
従って、上記(a) 〜(c) の何れの構成を採用した場合でも、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事はなくなり、この転がり軸受に電食が発生する事がなくなる。
この為、コストが嵩みしかも運転音を増大させる特殊なグリースを使用せず、しかもブラシを使用しないので運転に伴って塵を発生させる事もない構造で、転がり軸受の電食を防止して、ファン駆動用電動モータの耐久性向上を図れる。
In the case of the present invention configured as described above, even if a shaft voltage is induced on the rotating shaft based on the high-frequency current applied from the inverter to the stator, the current flow from the rotating shaft to the ground is one place. If insulation is performed as described above, no current flows through the rolling bearing.
First, in the case of adopting the configuration of (a) and (b), the outer ring or the inner ring is insulated from the mounting portion of the member holding the outer ring or the inner ring, so that the outer ring and the inner ring are incorporated. No current flows through the rolling bearing.
Further, when the configuration (c) is adopted, the mounting point between the motor case and the motor base is insulated, so that no current flows through the rolling bearing.
Therefore, even when any of the above configurations (a) to (c) is adopted, current does not flow through the rolling bearing provided between the rotating shaft and the motor case, and galvanic corrosion is generated in the rolling bearing. Things disappear.
For this reason, it does not use special grease that increases costs and increases operating noise, and since it does not use brushes, it has a structure that does not generate dust during operation and prevents electrolytic corrosion of rolling bearings. The durability of the electric motor for driving the fan can be improved.
図1〜6は、本発明の実施の形態を示している。尚、本発明の特徴は、モータケース2の内側に回転軸4を支持する為の転がり軸受3、3に電流が流れるのを防止し、この転がり軸受3、3の構成部品に電食が発生するのを防止する為の構造にある。その他の部分の構造及び作用は、前述した従来構造と同様であるので、同等部分に関する説明は省略若しくは簡略にし、以下、本発明の特徴部分を中心に説明する。   1 to 6 show an embodiment of the present invention. The feature of the present invention is that current is prevented from flowing through the rolling bearings 3 and 3 for supporting the rotating shaft 4 inside the motor case 2, and electrolytic corrosion occurs in the components of the rolling bearings 3 and 3. It is in the structure for preventing it. Since the structure and operation of the other parts are the same as those of the conventional structure described above, the explanation for the equivalent parts will be omitted or simplified, and the following will focus on the characteristic parts of the present invention.
先ず、図1は、本発明の実施例1を示している。1対の転がり軸受3、3の内輪12、12は、それぞれ回転軸4の両端部に形成した小径部23、23の周囲に、絶縁スリーブ24、24を介して外嵌固定している。この絶縁スリーブ24、24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。即ち、これら各絶縁スリーブ24、24は、上記小径部23、23に外嵌自在な円筒部25の外周面一端縁に大鍔部26を、外周面他端縁に小鍔部27を、それぞれ形成している。そして、このうちの大鍔部26を上記回転軸4の外周面に形成した段部13、13に対向させた状態で、この回転軸4に外嵌している。上記各絶縁スリーブ24、24に外嵌した上記各内輪12、12を上記回転軸4に支持した状態で、上記各大鍔部26、26は、これら各内輪12、12の一端面と上記段部13、13との間に挟持されて、これら一端面と段部13、13とが当接するのを阻止する。又、上記各円筒部25、25は、上記各内輪12、12の内周面と上記小径部23、23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。更に、上記各小鍔部27、27は、上記各内輪12、12の他端面内周縁部に係合して、これら内輪12、12と上記各絶縁スリーブ24、24とが不用意に分離するのを防止する。   First, FIG. 1 shows Embodiment 1 of the present invention. The inner rings 12, 12 of the pair of rolling bearings 3, 3 are externally fixed around the small diameter portions 23, 23 formed at both ends of the rotating shaft 4 via insulating sleeves 24, 24. The insulating sleeves 24 and 24 are made of an insulating material such as hard rubber or synthetic resin and are formed in a substantially cylindrical shape with an L-shaped cross section. That is, each of the insulating sleeves 24, 24 has a large collar part 26 at one edge of the outer peripheral surface of the cylindrical part 25 that can be fitted around the small diameter parts 23, 23, and a small collar part 27 at the other edge of the outer peripheral surface. Forming. Of these, the large collar portion 26 is externally fitted to the rotary shaft 4 in a state of facing the step portions 13 and 13 formed on the outer peripheral surface of the rotary shaft 4. In a state where the inner rings 12, 12 externally fitted to the insulating sleeves 24, 24 are supported on the rotating shaft 4, the large collar portions 26, 26 are connected to one end surface of the inner rings 12, 12 and the stepped portion. It is clamped between the parts 13 and 13, and it prevents that these one end surfaces and the step parts 13 and 13 contact | abut. The cylindrical portions 25 and 25 are sandwiched between the inner peripheral surface of the inner rings 12 and 12 and the outer peripheral surface of the small-diameter portions 23 and 23 to prevent these peripheral surfaces from coming into contact with each other. To do. Further, each of the small collar portions 27, 27 engages with the inner peripheral edge of the other end surface of each of the inner rings 12, 12, and the inner rings 12, 12 and the insulating sleeves 24, 24 are inadvertently separated. To prevent.
上述の様に構成される本実施例の場合には、インバータからステータ19に印加される高周波電流に基づいて回転軸4に軸電圧が惹起されても、この回転軸4とモータケース2との間に電流が流れる事がない。即ち、上記回転軸4を支持する転がり軸受3、3を構成する内輪12、12と、これら各内輪12、12を保持している部材である回転軸4との取付個所が絶縁されているので、上記回転軸4の電位が上記モータケース2の電位より高くなっても、これら内輪12、12を組み込んで成る転がり軸受3、3に電流が流れる事がなくなる。従って、これら各転がり軸受3、3に電食が発生する事がなくなる。   In the case of this embodiment configured as described above, even if an axial voltage is induced in the rotating shaft 4 based on the high-frequency current applied from the inverter to the stator 19, the rotating shaft 4 and the motor case 2 No current flows between them. That is, since the mounting portions of the inner rings 12 and 12 constituting the rolling bearings 3 and 3 that support the rotating shaft 4 and the rotating shaft 4 that is a member holding the inner rings 12 and 12 are insulated. Even if the electric potential of the rotating shaft 4 becomes higher than the electric potential of the motor case 2, no current flows through the rolling bearings 3, 3 incorporating the inner rings 12, 12. Therefore, no electrolytic corrosion occurs in each of the rolling bearings 3 and 3.
図2は、本発明の実施例2を示している。1対の転がり軸受3、3の外輪11、11は、それぞれモータケース2の両端部に形成した保持段部9或は保持凹部10の内側に、絶縁スリーブ24a、24aを介して内嵌固定している。この絶縁スリーブ24a、24a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。即ち、これら各絶縁スリーブ24a、24aは、上記保持段部9或は保持凹部10に内嵌自在な円筒部25aの内周面一端縁に大鍔部26aを、内周面他端縁に小鍔部27aを、それぞれ形成している。そして、このうちの大鍔部26aを上記保持段部9或は保持凹部10の奥面に対向させた状態で、これら保持段部9或は保持凹部10に内嵌している。上記各絶縁スリーブ24a、24aに内嵌した上記各外輪11、11を上記保持段部9或は保持凹部10に支持した状態で、上記各大鍔部26a、26aは、これら各外輪11、11の一端面と上記保持段部9或は保持凹部10の奥面との間に挟持されて、これら一端面と奥面とが当接するのを阻止する。又、上記各円筒部25a、25aは、上記各外輪11、11の外周面と上記保持段部9或は保持凹部10の内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。更に、上記各小径鍔部27a、27aは、上記各外輪11、11の他端面外周縁部に係合して、これら外輪11、11と上記各絶縁スリーブ24a、24aとが不用意に分離するのを防止する。   FIG. 2 shows a second embodiment of the present invention. The outer rings 11 and 11 of the pair of rolling bearings 3 and 3 are fitted and fixed to the inside of the holding step 9 or holding recess 10 formed at both ends of the motor case 2 via insulating sleeves 24a and 24a, respectively. ing. The insulating sleeves 24a and 24a are made of an insulating material such as hard rubber or synthetic resin and are formed in a substantially cylindrical shape with an L-shaped cross section. That is, each of the insulating sleeves 24a, 24a has a large collar portion 26a at one edge of the inner peripheral surface of the cylindrical portion 25a that can be fitted in the holding step portion 9 or the holding recess 10 and a small edge at the other end of the inner peripheral surface. The flange portions 27a are formed respectively. Of these, the large collar portion 26 a is fitted into the holding step portion 9 or the holding recess portion 10 with the holding step portion 9 or the holding recess portion 10 facing the back surface. In a state where the outer rings 11, 11 fitted inside the insulating sleeves 24 a, 24 a are supported by the holding step portion 9 or the holding recess 10, the large collar portions 26 a, 26 a are connected to the outer rings 11, 11. Are held between the one end face and the back face of the holding step 9 or the holding recess 10 to prevent the one end face and the back face from coming into contact with each other. The cylindrical portions 25a and 25a are sandwiched between the outer peripheral surface of the outer rings 11 and 11 and the inner peripheral surface of the holding step portion 9 or the holding concave portion 10, and the two peripheral surfaces are in contact with each other. Stop contact. Further, the small diameter flanges 27a, 27a engage with the outer peripheral edge portions of the other end surfaces of the outer rings 11, 11, and the outer rings 11, 11 and the insulating sleeves 24a, 24a are carelessly separated. To prevent.
上述の様に構成される本実施例の場合にも、インバータからステータ19に印加される高周波電流に基づいて回転軸4に軸電圧が惹起されても、この回転軸4とモータケース2との間に電流が流れる事がない。即ち、上記回転軸4を支持する転がり軸受3、3を構成する外輪11、11と、これら各外輪11、11を保持している部材であるモータケース2との取付個所が絶縁されているので、上記回転軸4の電位が上記モータケース2の電位より高くなっても、これら外輪11、11を組み込んで成る転がり軸受3、3に電流が流れる事がなくなる。従って、これら各転がり軸受3、3に電食が発生する事がなくなる。   Even in the case of the present embodiment configured as described above, even if an axial voltage is induced on the rotating shaft 4 based on the high-frequency current applied from the inverter to the stator 19, the rotating shaft 4 and the motor case 2 No current flows between them. That is, since the mounting portions of the outer rings 11 and 11 constituting the rolling bearings 3 and 3 that support the rotating shaft 4 and the motor case 2 that is a member holding these outer rings 11 and 11 are insulated. Even when the electric potential of the rotating shaft 4 becomes higher than the electric potential of the motor case 2, no current flows through the rolling bearings 3, 3 incorporating the outer rings 11, 11. Therefore, no electrolytic corrosion occurs in each of the rolling bearings 3 and 3.
図3は、本発明の実施例3を示している。本実施例の場合には、回転軸4に形成した小径部23、23の基端部でそれぞれ転がり軸受3、3を構成する内輪12、12の内周面と対向する部分、並びに上記回転軸4の中間部に形成され、これら内輪12、12の一端面が対向する段部13、13の表面に、酸化膜等の絶縁層28、28を形成している。これら各絶縁層28、28が、上記各内輪12、12の内周面及び一端面と上記回転軸4との取付個所を電気的に絶縁して、これら各内輪12、12と回転軸4との間に電流が流れる事を防止する。従って、本実施例の場合も、前述の実施例1の場合と同様に、転がり軸受3、3の構成部品に電食が発生する事を防止する。   FIG. 3 shows a third embodiment of the present invention. In the case of the present embodiment, the portions facing the inner peripheral surfaces of the inner rings 12, 12 constituting the rolling bearings 3, 3 at the base end portions of the small diameter portions 23, 23 formed on the rotating shaft 4, respectively, and the rotating shaft 4, insulating layers 28 and 28 such as oxide films are formed on the surfaces of the stepped portions 13 and 13 that are formed in the middle portion of the inner ring 12 and facing one end surfaces of the inner rings 12 and 12. These insulating layers 28 and 28 electrically insulate the inner peripheral surface and one end surface of each inner ring 12 and 12 and the mounting portion between the rotating shaft 4 and the inner rings 12 and 12 and the rotating shaft 4. Prevents current from flowing between. Therefore, also in the case of the present embodiment, as in the case of the above-described first embodiment, it is possible to prevent electrolytic corrosion from occurring in the components of the rolling bearings 3 and 3.
図4は、本発明の実施例4を示している。本実施例の場合には、モータケース2に形成した保持段部9及び保持凹部10の内周面、及び奥端面の一部でそれぞれ転がり軸受3、3を構成する外輪11、11の外周面及び一端面が対向する部分の表面に、酸化膜等の絶縁層28a、28aを形成している。これら各絶縁層28a、28aが、上記各外輪11、11の外周面及び一端面と上記モータケース2との取付個所を電気的に絶縁して、これら各外輪11、11とモータケース2との間に電流が流れる事を防止する。従って、本実施例の場合も、前述の実施例2の場合と同様に、転がり軸受3、3の構成部品に電食が発生する事を防止する。   FIG. 4 shows a fourth embodiment of the present invention. In the case of the present embodiment, the outer peripheral surfaces of the outer rings 11 and 11 constituting the rolling bearings 3 and 3 respectively at the inner peripheral surface of the holding step portion 9 and the holding concave portion 10 formed on the motor case 2 and a part of the rear end surface. Insulating layers 28a, 28a such as oxide films are formed on the surface of the portion where the one end faces. These respective insulating layers 28a, 28a electrically insulate the outer peripheral surface and one end surface of each outer ring 11, 11 and the mounting portion between the motor case 2, and the outer rings 11, 11 and the motor case 2 are electrically insulated. Prevent current from flowing between them. Therefore, also in the case of the present embodiment, as in the case of the above-described second embodiment, the occurrence of electrolytic corrosion on the components of the rolling bearings 3 and 3 is prevented.
尚、外輪11と保持段部9或は保持凹部10との間、或は内輪12と回転軸4との間に設ける絶縁スリーブ若しくは絶縁層の構造は、図1〜4に示した構造に限らず、他にも、例えば図5(A)〜(D)に示す様な構造を採用する事もできる。先ず、(A)に示した構造は、外輪11の外周面(又は内輪の内周面)及び一端面に係止凹溝29、29を形成し、これら各係止凹溝29、29と絶縁スリーブ24bに形成した係止突条30、30とを係合させたものである。この様な構造によれば、上記外輪11と絶縁スリーブ24bとの分離防止をより確実に図れる。尚、この様な構造を造る場合には、上記外輪11を射出成形型のキャビティ内にセットした状態で、上記絶縁スリーブ24bを射出成形したり、或は別個射出成形した絶縁スリーブ24bを、後から外輪11に嵌合させて互いに結合する。前者の場合には、上記絶縁スリーブ24bが射出成形後の収縮により外輪11に強く噛み付き、この外輪11から外れなくなる。又、後者の場合には、エポキシ樹脂等、熱膨張係数の異なる材質同士の接着に好適な接着剤により上記両部材24b、11同士を接着する事が考えられる。   The structure of the insulating sleeve or insulating layer provided between the outer ring 11 and the holding step 9 or holding recess 10 or between the inner ring 12 and the rotating shaft 4 is limited to the structure shown in FIGS. In addition, for example, a structure as shown in FIGS. 5A to 5D can also be adopted. First, in the structure shown in (A), the locking grooves 29 and 29 are formed on the outer peripheral surface of the outer ring 11 (or the inner peripheral surface of the inner ring) and one end surface, and are insulated from these locking grooves 29 and 29. The engaging protrusions 30 and 30 formed on the sleeve 24b are engaged with each other. According to such a structure, separation of the outer ring 11 and the insulating sleeve 24b can be prevented more reliably. In the case of constructing such a structure, the insulating sleeve 24b is injection-molded with the outer ring 11 set in the cavity of the injection mold, or the insulating sleeve 24b separately molded is formed later. Are fitted to the outer ring 11 and coupled to each other. In the former case, the insulating sleeve 24b is strongly engaged with the outer ring 11 by contraction after injection molding, and cannot be detached from the outer ring 11. In the latter case, it is conceivable that the members 24b and 11 are bonded to each other with an adhesive suitable for bonding materials having different thermal expansion coefficients such as epoxy resin.
次に、(B)に示した構造は、外輪11の外周面(又は内輪の内周面)に複数本(図示の例では2本)の係止凹溝31、31を全周に亙って形成すると共に、この外輪11の外周面及び両端面に、ポリ四弗化エチレン(PTFE)等の弗素樹脂の焼き付け皮膜等の絶縁層28bを形成している。尚、この弗素樹脂の焼き付け皮膜中には、フラン樹脂、エポキシ樹脂、ポリアミドイミド樹脂等の樹脂バインダーを含ませる。更に、上記各係止凹溝31、31には、ニトリル等のゴム、或は熱可塑性エラストマー等の弾性材製のOリング32、32を装着している。上記外輪11を保持段部9或は保持凹部10(図1〜4参照)に内嵌した状態で、これら各Oリング32、32は、上記保持段部9或は保持凹部10の内周面と摩擦係合し、これら保持段部9或は保持凹部10の内側で上記外輪11が回転(クリープ)するのを防止する。尚、このクリープ防止作用を得る為、上記Oリング32、32を構成する弾性材の硬度は、70〜90HDA 程度とするのが好ましい。この様な(B)に示した構造は、上述した(A)に示した構造、並びに次述する(C)に示した構造よりも低コストである。 Next, in the structure shown in (B), a plurality (two in the illustrated example) of locking concave grooves 31, 31 are formed on the entire outer periphery of the outer ring 11 (or the inner peripheral surface of the inner ring). In addition, an insulating layer 28b such as a baked film of a fluorine resin such as polytetrafluoroethylene (PTFE) is formed on the outer peripheral surface and both end surfaces of the outer ring 11. The fluororesin baked film contains a resin binder such as furan resin, epoxy resin, or polyamideimide resin. Further, O-rings 32, 32 made of rubber such as nitrile or elastic material such as thermoplastic elastomer are mounted in the respective locking grooves 31, 31. In a state in which the outer ring 11 is fitted in the holding step 9 or the holding recess 10 (see FIGS. 1 to 4), the O-rings 32 and 32 are formed on the inner peripheral surface of the holding step 9 or the holding recess 10. And the outer ring 11 is prevented from rotating (creeping) inside the holding step 9 or holding recess 10. Incidentally, to obtain the anti-creep effect, the hardness of the elastic material constituting the O-ring 32 and 32, preferably about 70~90HD A. Such a structure shown in (B) is less expensive than the structure shown in (A) described above and the structure shown in (C) described below.
次に、(C)に示した構造は、外輪11の外周面(又は内輪の内周面)及び両端面に係止凹溝29a、29aを形成し、これら各係止凹溝29a、29aと絶縁スリーブ24cに形成した係止突条30a、30aとを係合させ、更にこの絶縁スリーブ24cの外周面2個所位置に形成した係止凹溝31a、31aにOリング32、32を装着したものである。これら各Oリング32、32の材質及び作用は、上述した(B)の構造の場合と同様である。尚、この様な構造を造る場合には、上記外輪11を射出成形型のキャビティ内にセットした状態で、上記絶縁スリーブ24cを射出成形する。この絶縁スリーブ24cの材質としては、例えば、ガラス繊維を40重量%程度含む、ポリフェニレンサルファイド樹脂(PPS)が使用可能である。この様な(C)に示した構造は、上記絶縁スリーブ24cの厚さtを、1mm程度と、上述した(B)の構造に比べて大きくできるので、(B)の構造に比べて、絶縁性に関する信頼性を高くできる。   Next, in the structure shown in (C), locking grooves 29a, 29a are formed on the outer peripheral surface of the outer ring 11 (or the inner peripheral surface of the inner ring) and both end surfaces, and each of these locking grooves 29a, 29a and The engagement protrusions 30a and 30a formed on the insulating sleeve 24c are engaged, and the locking grooves 31a and 31a formed at two positions on the outer peripheral surface of the insulation sleeve 24c are mounted with O-rings 32 and 32. It is. The materials and functions of these O-rings 32 and 32 are the same as in the case of the structure (B) described above. In the case of producing such a structure, the insulating sleeve 24c is injection-molded with the outer ring 11 set in the cavity of an injection mold. As a material of the insulating sleeve 24c, for example, polyphenylene sulfide resin (PPS) containing about 40% by weight of glass fiber can be used. In such a structure shown in (C), since the thickness t of the insulating sleeve 24c can be increased to about 1 mm as compared with the structure of (B) described above, the insulating sleeve 24c is insulated compared to the structure of (B). High reliability in terms of sex.
次に、(D)に示した構造は、ゴム、熱可塑性エラストマー等の弾性材により外輪11とは別体に造った絶縁スリーブ24dを、外輪11の外周面に、この絶縁スリーブ24dの弾性を利用して被着したものである。弾性材の硬度は、70〜90HDA 程度とする。弾性材の材質としては、絶縁性が高いものが好ましいのは勿論であるが、例えばシリコンゴム等が好ましく使用できる。又、熱伝導性を向上させる為、AlN、Al23 等の充填材を充填しても良い。更に、必要に応じて、上記絶縁スリーブ24dの内周面と上記外輪11の外周面とを接着しても良い。この様な(D)に示した構造は、簡単に造れる絶縁スリーブ24dを外輪11に被着するのみで、電食防止とクリープ防止とを図れる為、低コストで信頼性の高い構造を実現できる。 Next, in the structure shown in (D), an insulating sleeve 24d made separately from the outer ring 11 by an elastic material such as rubber or thermoplastic elastomer is used, and the elasticity of the insulating sleeve 24d is applied to the outer peripheral surface of the outer ring 11. It was used and deposited. The hardness of the elastic material is about 70 to 90 HD A. As a material of the elastic material, it is a matter of course that a material having high insulation is preferable, but, for example, silicon rubber or the like can be preferably used. Further, for improving thermal conductivity, AlN, may be filled with a filler such as Al 2 O 3. Furthermore, you may adhere | attach the inner peripheral surface of the said insulation sleeve 24d, and the outer peripheral surface of the said outer ring | wheel 11 as needed. Such a structure shown in (D) can realize a highly reliable structure at low cost because it can prevent electric corrosion and creep by simply attaching an insulating sleeve 24d that can be easily made to the outer ring 11. .
図6は、本発明の実施例5を示している。本実施例の場合には、モータケース2を構成するケース本体5の外周面と、このモータケース2を定盤等の取付け部位に固定する為、上記ケース本体5の外周面に固定したモータベース33との間に絶縁材34を挟持して、これらモータケース2とモータベース33との取付個所を電気的に絶縁している。この様に構成される本実施例の場合には、回転軸4に軸電圧が惹起されても、回転軸4から転がり軸受3、3、モータケース2、モータベース33、このモータベース33を固定した定盤等を通って、大地に電流が流れなくなる。従って、回転軸4に軸電圧が惹起されても転がり軸受3、3(図1〜4参照)に電食が発生する事がなくなる。   FIG. 6 shows a fifth embodiment of the present invention. In the case of the present embodiment, the motor base fixed to the outer peripheral surface of the case main body 5 in order to fix the outer peripheral surface of the case main body 5 constituting the motor case 2 and the mounting portion of the surface plate or the like to the motor case 2. An insulating material 34 is sandwiched between the motor case 2 and the motor case 2 and the motor base 33 so as to be electrically insulated from each other. In the case of the present embodiment configured as described above, even if an axial voltage is induced on the rotating shaft 4, the rolling bearings 3, 3, the motor case 2, the motor base 33, and the motor base 33 are fixed from the rotating shaft 4. No current flows through the ground plate. Therefore, even if a shaft voltage is induced on the rotating shaft 4, no electrolytic corrosion occurs on the rolling bearings 3 and 3 (see FIGS. 1 to 4).
本発明の実施例1を示す断面図。Sectional drawing which shows Example 1 of this invention. 同実施例2を示す断面図。Sectional drawing which shows the same Example 2. FIG. 同実施例3を示す断面図。Sectional drawing which shows the same Example 3. FIG. 同実施例4を示す断面図。Sectional drawing which shows the same Example 4. FIG. 絶縁スリーブ若しくは絶縁層の別例を示す部分断面図。The fragmentary sectional view which shows another example of an insulating sleeve or an insulating layer. 本発明の実施例5を示す断面図。Sectional drawing which shows Example 5 of this invention. 従来構造の1例を示す断面図。Sectional drawing which shows an example of a conventional structure.
符号の説明Explanation of symbols
1 ファン駆動用電動モータ
2 モータケース
3 転がり軸受
4 回転軸
5 ケース本体
6 前蓋
7 後蓋
8 円孔
9 保持段部
10 保持凹部
11 外輪
12 内輪
13 段部
14 波板ばね
15 外輪軌道
16 内輪軌道
17 転動体
18 ロータ
19 ステータ
20 ブラシ
21 腕
22 板ばね
23 小径部
24、24a、24b、24c、24d 絶縁スリーブ
25 円筒部
26 大鍔部
27 小鍔部
28、28a、28b 絶縁層
29、29a 係止凹溝
30、30a 係止突条
31、31a 係止凹溝
32 Oリング
33 モータベース
34 絶縁材
DESCRIPTION OF SYMBOLS 1 Fan drive electric motor 2 Motor case 3 Rolling bearing 4 Rotating shaft 5 Case main body 6 Front cover 7 Rear cover 8 Circular hole 9 Holding step part 10 Holding recessed part 11 Outer ring 12 Inner ring 13 Step part 14 Wave plate spring 15 Outer ring track 16 Inner ring Track 17 Rolling element 18 Rotor 19 Stator 20 Brush 21 Arm 22 Leaf spring 23 Small diameter portion 24, 24a, 24b, 24c, 24d Insulating sleeve 25 Cylindrical portion 26 Large collar portion 27 Small collar portion 28, 28a, 28b Insulating layers 29, 29a Locking groove 30, 30a Locking protrusion 31, 31a Locking groove 32 O-ring 33 Motor base 34 Insulating material

Claims (1)

  1. 金属製のモータケースと、このモータケースの内側に複数の転がり軸受を介して回転自在に支持された回転軸と、この回転軸に固定されたロータと、上記モータケースに固定されて上記ロータと対向するステータとを備え、このステータにインバータから交流電流を流し、上記回転軸を回転させてこの回転軸に固定したファンを回転駆動するファン駆動用電動モータに於いて、次の(a) 〜(c) の少なくとも1個所を絶縁する事により、上記各転がり軸受に電流が流れる事を防止した事を特徴とするファン駆動用電動モータ。
    (a) 上記転がり軸受を構成する外輪とこの外輪を保持している部材との取付個所。
    (b) 上記転がり軸受を構成する内輪とこの内輪を保持している部材との取付個所。
    (c) 上記モータケースと、このモータケースを取付部位に固定すべく、このモータケースの外面に固定したモータベースとの取付個所。
    A metal motor case, a rotating shaft rotatably supported inside the motor case via a plurality of rolling bearings, a rotor fixed to the rotating shaft, a rotor fixed to the motor case, and the rotor An electric motor for driving a fan, comprising: an opposing stator; an alternating current from the inverter is passed through the stator, the rotary shaft is rotated, and the fan fixed to the rotary shaft is rotationally driven. (c) An electric motor for driving a fan, wherein current is prevented from flowing through each of the rolling bearings by insulating at least one point.
    (a) A mounting portion between the outer ring constituting the rolling bearing and a member holding the outer ring.
    (b) A mounting portion between the inner ring constituting the rolling bearing and a member holding the inner ring.
    (c) A mounting portion between the motor case and the motor base fixed to the outer surface of the motor case in order to fix the motor case to the mounting site.
JP2004260439A 2004-09-08 2004-09-08 Electric motor for fan drive Pending JP2005033999A (en)

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JP2004260439A JP2005033999A (en) 2004-09-08 2004-09-08 Electric motor for fan drive

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Application Number Priority Date Filing Date Title
JP2004260439A JP2005033999A (en) 2004-09-08 2004-09-08 Electric motor for fan drive

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP22863196A Division JP3612879B2 (en) 1996-08-29 1996-08-29 Electric motor for fan drive

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Publication Number Publication Date
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Country Link
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JP2007185020A (en) * 2006-01-05 2007-07-19 Hitachi Ltd Dynamo-electric machine, invertor drive dynamo-electric machine system, and inspection method
JP2008148453A (en) * 2006-12-11 2008-06-26 Mitsubishi Electric Corp Insulation ring and rotary electric machine
KR101010836B1 (en) * 2008-10-07 2011-01-25 엘지전자 주식회사 Motor for driving fan
WO2011105366A1 (en) 2010-02-23 2011-09-01 日本精工株式会社 Ball bearing equipped with encoder for detecting rotational speed of wheel of two-wheeled motor vehicle, and device for detecting rotational speed of wheel of two-wheeled motor vehicle, the device using the ball bearing
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JP2006333696A (en) * 2005-05-27 2006-12-07 Taida Electronic Ind Co Ltd Motor structure
JP2007185020A (en) * 2006-01-05 2007-07-19 Hitachi Ltd Dynamo-electric machine, invertor drive dynamo-electric machine system, and inspection method
JP2008148453A (en) * 2006-12-11 2008-06-26 Mitsubishi Electric Corp Insulation ring and rotary electric machine
KR101010836B1 (en) * 2008-10-07 2011-01-25 엘지전자 주식회사 Motor for driving fan
WO2011105366A1 (en) 2010-02-23 2011-09-01 日本精工株式会社 Ball bearing equipped with encoder for detecting rotational speed of wheel of two-wheeled motor vehicle, and device for detecting rotational speed of wheel of two-wheeled motor vehicle, the device using the ball bearing
WO2011111188A1 (en) * 2010-03-10 2011-09-15 三菱電機株式会社 Electric motor rotor, electric motor, air conditioner, and production method for electric motor rotor
EP2546958A4 (en) * 2010-03-10 2016-12-28 Mitsubishi Electric Corp Electric motor rotor, electric motor, air conditioner, and production method for electric motor rotor
JP2011239508A (en) * 2010-05-07 2011-11-24 Mitsubishi Electric Corp Rotator of electromotor and electromotor and method for manufacturing rotator of electromotor, and air conditioner
CN102278294A (en) * 2010-06-11 2011-12-14 日立空调·家用电器株式会社 Displacement compressor
JP2011259646A (en) * 2010-06-11 2011-12-22 Hitachi Appliances Inc Displacement compressor
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US8636417B2 (en) 2010-07-28 2014-01-28 Nsk Ltd. Wheel support structure for motorcycle
WO2012014622A1 (en) 2010-07-28 2012-02-02 日本精工株式会社 Wheel support structure for two-wheeled vehicle
JP2012228137A (en) * 2011-04-22 2012-11-15 Daikin Ind Ltd Bearing discharge prevention mechanism and motor unit
JP2012244819A (en) * 2011-05-20 2012-12-10 Mitsubishi Electric Corp Motor and air conditioner
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US10116182B2 (en) 2015-02-25 2018-10-30 Toyota Jidosha Kabushiki Kaisha Electric motor storing device for hybrid vehicle
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