JPH06169555A - Small motor - Google Patents
Small motorInfo
- Publication number
- JPH06169555A JPH06169555A JP31989792A JP31989792A JPH06169555A JP H06169555 A JPH06169555 A JP H06169555A JP 31989792 A JP31989792 A JP 31989792A JP 31989792 A JP31989792 A JP 31989792A JP H06169555 A JPH06169555 A JP H06169555A
- Authority
- JP
- Japan
- Prior art keywords
- commutator
- case
- commutator pieces
- pieces
- shape
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/04—Commutators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/06—Manufacture of commutators
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Motor Or Generator Current Collectors (AREA)
- Dc Machiner (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、たとえば音響機器、精
密機器等に使用される小型モータに関するものであり、
特に小型モータを構成する整流子の改良により、電気的
かつ機械的ノイズの発生を防止するようにした小型モー
タに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor used in, for example, audio equipment and precision equipment.
In particular, the present invention relates to a small motor in which the generation of electrical and mechanical noise is prevented by improving the commutator constituting the small motor.
【０００２】[0002]
【従来の技術】図５は従来の小型モータの例を示す要部
縦断面正面図である。図５において、１はケースであ
り、例えば軟鉄のような金属材料により有底中空筒状に
形成され、内周面に例えばアークセグメント状に形成さ
れた永久磁石２を固着する。このケース１内には前記永
久磁石２に対向する電機子３と整流子４とからなる回転
子５を介装し得るように構成する。次に６はケースキャ
ップであり、絶縁材料によって形成され、ケース１の開
口部に嵌着される。７はブラシであり、自由端を前記整
流子４と摺動係合するように設け、このブラシ７と電気
的に接続されてなる入力端子８と共にケースキャップ６
に設けられる。９，１０は軸受であり、各々ケース１の
底部とケースキャップ６の中央部に固着され、回転子５
を構成する軸１１，１２を回転自在に支持する。2. Description of the Related Art FIG. 5 is a vertical sectional front view of an essential part showing an example of a conventional small motor. In FIG. 5, reference numeral 1 denotes a case, which is formed of a metal material such as soft iron into a hollow cylindrical shape with a bottom, and has an inner peripheral surface to which a permanent magnet 2 formed in, for example, an arc segment shape is fixed. A rotor 5 including an armature 3 facing the permanent magnet 2 and a commutator 4 can be provided in the case 1. Next, 6 is a case cap, which is made of an insulating material and is fitted into the opening of the case 1. Reference numeral 7 denotes a brush, the free end of which is slidably engaged with the commutator 4 and an input terminal 8 electrically connected to the brush 7 together with a case cap 6
It is provided in. Reference numerals 9 and 10 denote bearings, which are fixed to the bottom portion of the case 1 and the central portion of the case cap 6, respectively.
The shafts 11 and 12 constituting the above are rotatably supported.
【０００３】上記の構成により、入力端子８からブラシ
７を介して回転子５を構成する整流子４を経由して電機
子３に電流を供給することにより、ケース１の内周面に
固着された永久磁石２によって形成されている磁界中に
存在する電機子３に回転力が付与され、回転子５を回転
させることができ、出力側の軸１１を介して外部機器
（図示せず）を駆動することができる。With the above structure, the current is supplied from the input terminal 8 to the armature 3 via the brush 7 and the commutator 4 constituting the rotor 5, so that the case 1 is fixed to the inner peripheral surface of the case 1. The rotating force is applied to the armature 3 existing in the magnetic field formed by the permanent magnet 2 to rotate the rotor 5, and an external device (not shown) can be driven via the output side shaft 11. Can be driven.
【０００４】[0004]
【発明が解決しようとする課題】上記構成の小型モータ
を構成する整流子４の外周面は、ブラシ７と密着して摺
動するように平滑かつ真円度を確保するように形成され
ている。図６は図５における整流子４を示す要部端面図
である。図６において整流子４は、絶縁材料によって円
筒状に形成された芯材４１の外周面に、例えば銅板によ
りセグメント状に形成された複数個の整流子片４２を円
周方向に間隙４３を介して等間隔に配設して構成される
のが通常である。The outer peripheral surface of the commutator 4 which constitutes the small motor having the above-described structure is formed so as to be in smooth contact with the brush 7 and to ensure a roundness. . FIG. 6 is an end view of the main part showing the commutator 4 in FIG. In FIG. 6, the commutator 4 has a plurality of commutator pieces 42 formed in a segment shape, for example, a copper plate, on an outer peripheral surface of a core material 41 formed of an insulating material in a cylindrical shape with a gap 43 in the circumferential direction. Are usually arranged at equal intervals.
【０００５】そして整流子片４２の外周面の真円度を確
保するために、図７（ａ）に示すようにバイト１３によ
る旋削加工を施す場合がある。この場合において、円周
方向の整流子片４２相互間に間隙４３が存在し、かつ整
流子片４２の側面部はバイト１３の切削方向と略直角に
なっているため、整流子片４２の間隙４３に臨む角隅部
にバリ４４が発生する。Then, in order to secure the roundness of the outer peripheral surface of the commutator piece 42, turning may be performed by the cutting tool 13 as shown in FIG. 7 (a). In this case, a gap 43 exists between the commutator pieces 42 in the circumferential direction, and the side surface portion of the commutator piece 42 is substantially perpendicular to the cutting direction of the cutting tool 13. Burrs 44 occur at the corners facing 43.
【０００６】一方図７（ｂ）に示すように、モールド型
の整流子４の場合には、整流子片４２の外周を旋削加工
後において、メタルソー若しくはスリ割りフライスなど
の工具によって、整流子片４２相互の間隙４３を形成し
た場合にも、バリ４５が発生するのである。On the other hand, as shown in FIG. 7B, in the case of the mold type commutator 4, after turning the outer periphery of the commutator piece 42, the commutator piece is cut by a tool such as a metal saw or a slitting milling cutter. Even when the mutual gap 43 is formed, the burr 45 is generated.
【０００７】上記のように整流子片４２にバリ４４，４
５が発生したままの状態において、ブラシ７と摺動させ
ると、ブラシ７と整流子片４２との接触が不安定とな
り、電気的ノイズおよび機械的ノイズが増大し、小型モ
ータの性能を著しく低下させる。またブラシ７の摩耗を
助長して寿命を低下させるのみならず、回転中に上記バ
リ４４，４５が整流子片４２から剥離、脱落すると、短
絡事故をも惹起するという危険性がある。As described above, the burrs 44, 4 are formed on the commutator piece 42.
When the brush 7 is slid in the state in which No. 5 is still generated, the contact between the brush 7 and the commutator piece 42 becomes unstable, electrical noise and mechanical noise increase, and the performance of the small motor significantly deteriorates. Let Further, not only is the wear of the brush 7 promoted to shorten the life thereof, but there is a risk that a short circuit accident may be caused if the burrs 44 and 45 are separated and dropped from the commutator piece 42 during rotation.
【０００８】このため上記切削加工後において、上記バ
リ４４，４５を除去する作業が必要となる。しかしなが
らこのバリ除去作業は通常細目のやすり若しくはカッタ
ー等を使用する手作業に依存せざるを得ず、また対象部
位が狭小であるため煩雑であり、時間と工数を要し、コ
ストアップの原因となるという問題点がある。更に上記
作業によって除去されたバリ４４，４５は微小片である
ため、整流子４のみならず回転子５（図５参照）を構成
する他の構成部材にも付着係止するおそれがあり、電気
的障害の原因ともなり得る。従ってバリ除去作業後の清
掃作業も必要となり、製造コストを更に高騰させるとい
う問題点がある。Therefore, it is necessary to remove the burrs 44 and 45 after the cutting process. However, this burr removal work usually has to rely on a fine file or a manual work such as using a cutter, and it is complicated because the target area is small, which requires time and man-hours, and causes a cost increase. There is a problem that Further, since the burrs 44 and 45 removed by the above-mentioned work are minute pieces, there is a risk that they will adhere to and lock not only the commutator 4 but also other components constituting the rotor 5 (see FIG. 5). Can also cause intellectual disability. Therefore, a cleaning operation is required after the burr removal operation, which causes a problem of further increasing the manufacturing cost.
【０００９】本発明は上記従来技術に存在する問題点を
解決し、整流子片に機械加工時のバリを発生させること
がなく、かつ低コストで製造し得る小型モータを提供す
ることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems existing in the prior art and to provide a small motor which does not cause burrs on a commutator piece during machining and can be manufactured at low cost. To do.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明においては、金属材料により有底中空筒状に
形成されかつ内周面に永久磁石を固着してなるケース
と、前記永久磁石に対向する電機子と整流子とからなる
回転子と、前記ケースの開口部に嵌着されかつ前記整流
子と摺動係合されるブラシとこのブラシに電気的に接続
されてなる入力端子とを設けてなるケースキャップとか
らなり、前記ケースの底部とケースキャップとに設けら
れた軸受を介して前記回転子を回転自在に支持してなる
小型モータにおいて、樹脂材料からなる芯材の外周面に
導電性金属材料によりセグメント状に形成した複数個の
整流子片を円周方向に間隙を介して配設して整流子を構
成すると共に、整流子片の間隙に臨む外周角隅部に面取
部を設ける、という技術的手段を採用した。In order to achieve the above object, in the present invention, a case formed of a metal material in a hollow cylindrical shape with a bottom and a permanent magnet fixed to the inner peripheral surface thereof, A rotor including an armature facing the magnet and a commutator, a brush fitted in the opening of the case and slidably engaged with the commutator, and an input terminal electrically connected to the brush. In a small motor comprising a case cap provided with and a rotor provided rotatably via a bearing provided on the bottom of the case and the case cap, the outer periphery of a core material made of a resin material. A commutator is formed by arranging a plurality of commutator pieces formed in a segment shape from a conductive metal material on the surface with a gap in the circumferential direction, and at the outer peripheral corners facing the gap of the commutator pieces. To have a chamfer It adopted the operative means.
【００１１】本発明において面取部の大きさをあまり大
に形成すると、ブラシが整流子片間の間隙を通過する際
の振動発生の原因ともなるため好ましくないが、少なく
とも整流子片の外周面若しくは整流子片間の間隙を加工
した後においても残存する大きさ、すなわち片側切削代
より大なる寸法とする必要がある。In the present invention, if the chamfered portion is made too large, it is not preferable because it causes vibration when the brush passes through the gap between the commutator pieces, but at least it is not preferable. Alternatively, it is necessary to make the size that remains even after processing the gap between the commutator pieces, that is, the size larger than the cutting allowance on one side.
【００１２】また整流子片の外周面の旋削加工を行う場
合には、面取部は整流子片の加工方向下流側の角隅部の
みに設けるようにしてもよい。Further, when the outer peripheral surface of the commutator piece is turned, the chamfered portion may be provided only at the corner portion on the downstream side of the commutator piece in the processing direction.
【００１３】[0013]
【作用】上記の構成により、整流子片の旋削加工による
バリの発生を防止することができる。すなわち面取部を
設けない状態で旋削加工を行った場合には、切粉の始端
部から終端部に至るまでの厚さ寸法が同一であるのに対
し、本発明の整流子片においては、少なくとも整流子片
の加工方向下流側の角隅部に面取部を設けた構成である
ため、切粉の終端部の厚さ寸法が中間部より小となり、
所謂三日月状断面になることにより、バリの発生を抑制
することができるのである。With the above construction, it is possible to prevent burrs from being generated by turning the commutator piece. That is, when performing the turning process without the chamfered portion, the thickness dimension from the starting end portion to the end portion of the chips is the same, in the commutator piece of the present invention, At least the commutator piece has a chamfered portion at the downstream corner in the processing direction, so that the thickness of the end portion of the chips is smaller than that of the middle portion,
The so-called crescent-shaped cross section can suppress the generation of burrs.
【００１４】[0014]
【実施例】図１は本発明の実施例における整流子を示す
拡大斜視図、図２は図１における整流子片を示す拡大斜
視図であり、同一部分は前記図５ないし図７と同一の参
照符号にて示す。図１および図２において、整流子片４
２は、例えば銅板をプレス加工によりセグメント状に成
形し、樹脂材料からなる芯材４１の外周面に、円周方向
に間隙４３を介して配設する。４６は端子片であり、自
由端を略Ｕ字状に形成し、整流子片４２の端部に一体に
突設し、電機子を形成するコイル（何れも図示せず）の
端末を電気的に接続する。次に４７は面取部であり、整
流子片４２の長手方向の外周角隅部に設ける。４８は固
着部材であり、整流子片４２の端子片４６側に介装する
ことにより、複数個の整流子片４２を芯材４１の外周に
固着可能に構成する。1 is an enlarged perspective view showing a commutator according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view showing a commutator piece in FIG. 1, and the same portions are the same as those in FIGS. It is indicated by a reference numeral. 1 and 2, the commutator piece 4
2 is, for example, formed by pressing a copper plate into a segment shape, and is arranged on the outer peripheral surface of a core material 41 made of a resin material with a gap 43 in the circumferential direction. Reference numeral 46 denotes a terminal piece, the free end of which is formed in a substantially U shape, and which is integrally projectingly provided at the end of the commutator piece 42 to electrically connect the end of a coil (not shown) forming an armature Connect to. Next, 47 is a chamfered portion, which is provided at the outer peripheral corner of the commutator piece 42 in the longitudinal direction. Reference numeral 48 denotes a fixing member, and by interposing the commutator piece 42 on the terminal piece 46 side, a plurality of commutator pieces 42 can be fixed to the outer periphery of the core material 41.
【００１５】図３は整流子片４２に設けられる面取部４
７を示す要部端面図であり、（ａ）は整流子片４２の両
角隅部に設けたもの、（ｂ）は整流子片４２の一方の角
隅部に設けたものを示し、同一部分は前記図１および図
２と同一の参照符号で示す。まず図３（ａ）において、
ｄ0 およびｄは各々整流子片４２の旋削加工前後の外径
寸法、ｔは片側切削代、ｃは面取部４７の面取寸法であ
る。FIG. 3 shows a chamfered portion 4 provided on the commutator piece 42.
7A and 7B are end views of the main part, where FIG. 7A is provided at both corners of the commutator piece 42, and FIG. 7B is provided at one corner of the commutator piece 42. Are designated by the same reference numerals as those in FIGS. 1 and 2. First, in FIG. 3 (a),
d 0 and d are outer diameter dimensions of the commutator piece 42 before and after turning, t is one-side cutting allowance, and c is a chamfered dimension of the chamfered portion 47.
【００１６】すなわち面取寸法ｃは、整流子片４２の片
側切削代ｔよりも大に形成し、整流子片４２を外径寸法
ｄ0 から外径寸法ｄに旋削加工した後においても、整流
子片４２の外周角隅部に残存するように形成する。この
ような面取部４７は、図２に示す整流子片４２のプレス
成形時において同時に形成してもよく、整流子４を構成
した後に切削加工によって形成してもよい。That is, the chamfer dimension c is formed to be larger than the one-side cutting allowance t of the commutator piece 42, and even after the commutator piece 42 is turned from the outer diameter dimension d 0 to the outer diameter dimension d, the commutation is performed. It is formed so as to remain at the outer peripheral corners of the child piece 42. Such a chamfered portion 47 may be formed at the same time when the commutator piece 42 shown in FIG. 2 is press-molded, or may be formed by cutting after forming the commutator 4.
【００１７】図４は旋削加工時における切粉の形状を模
式的に示す説明図である。図４において、バイト１３に
よって削り取られた切粉１４の断面は略三日月状に形成
される。すなわち整流子片４２に面取部４７を設けたこ
とにより、切粉１４の始端部と終端部とにおける厚さ寸
法は、バイト１３の切込量と対応する中間部より小であ
るため、前記図７（ａ）に示すようなバリ４４の発生が
抑制されるのである。FIG. 4 is an explanatory view schematically showing the shape of chips during turning. In FIG. 4, the cross section of the cutting chips 14 scraped off by the cutting tool 13 is formed into a substantially crescent shape. That is, since the commutator piece 42 is provided with the chamfered portion 47, the thickness dimension at the starting end portion and the terminating end portion of the cutting powder 14 is smaller than the intermediate portion corresponding to the cutting amount of the cutting tool 13. The generation of the burr 44 as shown in FIG. 7A is suppressed.
【００１８】次に図３（ｂ）に示すものは、整流子片４
２の一方の角隅部に設けた例である。すなわち整流子片
４２の外周を旋削加工する場合、被加工材である整流子
片４２の回転方向は一方向に限定されることが殆ど（例
えば矢印方向）である。従って面取部４７は加工方向下
流側の角隅部のみに設けても、図４において説明したも
のと同様にバリの発生を抑制することができるのであ
る。Next, as shown in FIG. 3B, the commutator piece 4 is used.
2 is an example provided at one corner of 2. That is, when turning the outer periphery of the commutator piece 42, the rotation direction of the commutator piece 42 that is the workpiece is almost always limited to one direction (for example, the arrow direction). Therefore, even if the chamfered portion 47 is provided only at the corner portion on the downstream side in the processing direction, it is possible to suppress the occurrence of burrs as described in FIG.
【００１９】[0019]
【発明の効果】本発明は以上記述のような構成および作
用であるから、整流子片の外周面の旋削によっても有害
なバリの発生を抑制することができ、電気的かつ機械的
ノイズの発生を防止し、小型モータの性能を向上させ得
る。また手作業による煩雑なバリ除去作業およびこれに
付随する清掃作業が不要となり、製造コストの低減が可
能であるという効果がある。Since the present invention has the structure and operation as described above, generation of harmful burrs can be suppressed even by turning the outer peripheral surface of the commutator piece, and electrical and mechanical noise is generated. Can be prevented and the performance of a small motor can be improved. Further, there is an effect that a complicated deburring work by hand and a cleaning work associated therewith are unnecessary, and the manufacturing cost can be reduced.
【図１】本発明の実施例における整流子を示す拡大斜視
図である。FIG. 1 is an enlarged perspective view showing a commutator according to an embodiment of the present invention.
【図２】図１における整流子片を示す拡大斜視図であ
る。FIG. 2 is an enlarged perspective view showing a commutator piece in FIG.
【図３】整流子片４２に設けられる面取部４７を示す要
部端面図であり、（ａ）は整流子片４２の両角隅部に設
けたもの、（ｂ）は整流子片４２の一方の角隅部に設け
たものを示す。3A and 3B are end views of a main part showing a chamfered portion 47 provided on a commutator piece 42, FIG. 3A being provided at both corners of the commutator piece 42, and FIG. The one provided at one corner is shown.
【図４】旋削加工時における切粉の形状を模式的に示す
説明図である。FIG. 4 is an explanatory view schematically showing the shape of chips during turning.
【図５】従来の小型モータの例を示す要部縦断面正面図
である。FIG. 5 is a vertical sectional front view of a main part showing an example of a conventional small motor.
【図６】図５における整流子４を示す要部端面図であ
る。6 is an end view of a main part showing a commutator 4 in FIG.
【図７】整流子４の加工時に発生するバリの状態を示す
要部端面図であり、（ａ）は旋削加工の場合、（ｂ）は
フライス加工の場合を示す。FIG. 7 is an end view of a main part showing a state of burrs generated during processing of a commutator 4, where (a) shows a case of turning and (b) shows a case of milling.
４２ 整流子片 ４７ 面取部 42 commutator piece 47 chamfer
Claims (1)
かつ内周面に永久磁石を固着してなるケースと、前記永
久磁石に対向する電機子と整流子とからなる回転子と、
前記ケースの開口部に嵌着されかつ前記整流子と摺動係
合されるブラシとこのブラシに電気的に接続されてなる
入力端子とを設けてなるケースキャップとからなり、前
記ケースの底部とケースキャップとに設けられた軸受を
介して前記回転子を回転自在に支持してなる小型モータ
において、 樹脂材料からなる芯材の外周面に導電性金属材料により
セグメント状に形成した複数個の整流子片を円周方向に
間隙を介して配設して整流子を構成すると共に、整流子
片の間隙に臨む外周角隅部に面取部を設けたことを特徴
とする小型モータ。1. A case formed of a metallic material in the shape of a hollow cylinder with a bottom and having a permanent magnet fixed to the inner peripheral surface thereof, and a rotor composed of an armature and a commutator facing the permanent magnet.
The bottom of the case comprises a brush fitted into the opening of the case and slidably engaged with the commutator, and a case cap provided with an input terminal electrically connected to the brush. In a small motor in which the rotor is rotatably supported by a bearing provided on a case cap, a plurality of commutations formed in a segment shape by a conductive metal material on an outer peripheral surface of a core material made of a resin material. A small motor characterized in that a commutator is formed by disposing a child piece in a circumferential direction with a gap therebetween, and a chamfered portion is provided at an outer peripheral corner portion facing the gap of the commutator piece.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31989792A JPH06169555A (en) | 1992-11-30 | 1992-11-30 | Small motor |
| DE19934339981 DE4339981A1 (en) | 1992-11-30 | 1993-11-24 | Miniature motor |
| GB9324457A GB2273003B (en) | 1992-11-30 | 1993-11-29 | Miniature motor |
| CN93120419A CN1034538C (en) | 1992-11-30 | 1993-11-29 | Miniature motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31989792A JPH06169555A (en) | 1992-11-30 | 1992-11-30 | Small motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06169555A true JPH06169555A (en) | 1994-06-14 |
Family
ID=18115458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31989792A Pending JPH06169555A (en) | 1992-11-30 | 1992-11-30 | Small motor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH06169555A (en) |
| CN (1) | CN1034538C (en) |
| DE (1) | DE4339981A1 (en) |
| GB (1) | GB2273003B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006060895A (en) * | 2004-08-18 | 2006-03-02 | Asmo Co Ltd | Rotary electric machine, commutator, and manufacturing method for commutator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010028854A (en) * | 1999-09-27 | 2001-04-06 | 윤종용 | Non directional frequency generator |
| DE29922730U1 (en) * | 1999-12-23 | 2001-05-03 | Nettelhoff Friedrich Fa | Molded commutator |
| DE10151696A1 (en) * | 2001-10-19 | 2003-04-30 | Bsh Bosch Siemens Hausgeraete | Sliding contact system and commutator for a dynamo-electric machine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2486875A (en) * | 1945-10-30 | 1949-11-01 | Gen Electric | Commutator for dynamoelectric machines and method of making the same |
| US3212171A (en) * | 1961-02-08 | 1965-10-19 | Echter Magnetic Products Compa | Method of making commutators |
| GB1572495A (en) * | 1976-02-20 | 1980-07-30 | Lucas Industries Ltd | Commutator |
| GB2217922A (en) * | 1988-04-20 | 1989-11-01 | Johnson Electric Ind Mfg | Commutator for an electric motor |
-
1992
- 1992-11-30 JP JP31989792A patent/JPH06169555A/en active Pending
-
1993
- 1993-11-24 DE DE19934339981 patent/DE4339981A1/en not_active Ceased
- 1993-11-29 GB GB9324457A patent/GB2273003B/en not_active Expired - Fee Related
- 1993-11-29 CN CN93120419A patent/CN1034538C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006060895A (en) * | 2004-08-18 | 2006-03-02 | Asmo Co Ltd | Rotary electric machine, commutator, and manufacturing method for commutator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9324457D0 (en) | 1994-01-12 |
| CN1096141A (en) | 1994-12-07 |
| GB2273003B (en) | 1996-03-06 |
| CN1034538C (en) | 1997-04-09 |
| GB2273003A (en) | 1994-06-01 |
| DE4339981A1 (en) | 1994-06-01 |
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