JP2004159437A - Carbon brush - Google Patents
Carbon brush Download PDFInfo
- Publication number
- JP2004159437A JP2004159437A JP2002323279A JP2002323279A JP2004159437A JP 2004159437 A JP2004159437 A JP 2004159437A JP 2002323279 A JP2002323279 A JP 2002323279A JP 2002323279 A JP2002323279 A JP 2002323279A JP 2004159437 A JP2004159437 A JP 2004159437A
- Authority
- JP
- Japan
- Prior art keywords
- added
- carbon
- binder
- particle size
- less
- 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.)
- Granted
Links
Images
Landscapes
- Motor Or Generator Current Collectors (AREA)
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、電気機械用のカーボンブラシに関し、特に、電動工具や電気掃除機等の整流子電動機用のカーボンブラシで、無線妨害特性が改善されたカーボンブラシに関する。
【０００２】
【従来の技術】
従来、この種の電気機械用カーボンブラシは、特許文献１にあるように、カーボン基材に固体潤滑剤及び研削剤を添加し、整流子との接触部分を除く周囲全面に電気良導性金属を被覆することで、ブラシの温度上昇を抑制し、長期間にわたって安定した整流効果を維持できることに主眼を置いて開発がなされてきた。また、無線妨害特性を改善するためにブラシ基材に油含浸することも検討されている。
【０００３】
【特許文献１】
特開２０００−１９７３１５号公報
【０００４】
【発明が解決しようとする課題】
ところが、電気掃除機や電動工具等の整流子電動機用のカーボンブラシは、近年、特に小型化、高出力化、高速回転化が進んでいる。そのため、小型ながら抵抗損が小さく、かつ摩耗が少ないカーボンブラシが要求されるようになった。
【０００５】
このような要求に対応するカーボンブラシは、一方ではラジオノイズを発生し易くなる。ラジオノイズが発生すると、周囲の電気機器に誤作動させるなどの影響を及ぼすことがあるため、日本を含めた各国、特に欧米諸国では、ラジオノイズの発生に対して厳しい規格を設け、ラジオノイズ発生に対して対策が施されるようになっている。
【０００６】
そこで、本発明は、ラジオノイズの発生を抑制した無線妨害特性が改善されたカーボンブラシを提供することを目的とする。
【０００７】
【課題を解決するための手段】
前記課題を解決するために本発明者らは、ブラシのカーボン基材に、二硫化モリブデン及び炭化ケイ素を所定量の範囲内で添加することによって、無線妨害特性が改善されることを見出し本発明を完成した。
【０００８】
すなわち、本発明のカーボンブラシは、カーボン基材に、添加剤として二硫化モリブデン及び炭化ケイ素が添加され、無線妨害特性が改善されたものである。また、二硫化モリブデンは、カーボン基材とバインダーとの合計量に対して０．５％以上、３％以下となるように添加され、炭化ケイ素は、カーボン基材とバインダーとの合計量に対して０．１％以上、０．５％以下となるように添加されているものである。また、バインダーが、熱硬化性樹脂又はピッチであるものである。
【０００９】
本発明におけるカーボン基材は、天然黒鉛、膨張黒鉛、人造黒鉛等が例示できるが、中でも、結晶化度の余り高くない、人造黒鉛が特に好ましい。また、これらを混合した黒鉛粒子であってもよい。また、鱗状黒鉛、土状黒鉛等その形態は特に限定されない。これらカーボン基材を用い、生成段階において、混合条件や、焼成条件等を調整することによって、ブラシ基材を所望の固有抵抗とすることが可能となる。
【００１０】
これら黒鉛粒子の粒子間を結合するバインダーは、一般的な熱硬化性樹脂を使用することができ、例えば、固体状或いは液体状のエポキシ樹脂、フェノール樹脂及びこれらを変性して得られる種々の熱硬化性樹脂等を使用することができる。これら、樹脂は、バインダー分として１０〜４０％を使用することが好ましい。
【００１１】
添加剤として添加する二硫化モリブデンは、単独で樹脂などに混合すると、静電気等の影響により凝集しやすく、樹脂内に均等に分散しにくい。しかしながら、本発明では通電性を有する黒鉛粒子と混合するため、静電気による凝集が非常に少なくなる。更に、バインダーを添加して混捏した上で、粉砕する。このため、メカノケミカル効果により二硫化モリブデンは完全に分散し、バインダー及び黒鉛粒子と強固に接着結合する。このようにして得られた黒鉛粒子を主成分とする混合粉を成形し、熱処理を行いブラシ基材とする。
【００１２】
しかしながら、二硫化モリブデンを含むブラシは、使用中に、整流子表面に皮膜を形成しやすい。この皮膜が厚くなりすぎると、剥離しやすくなる。そして、部分的に剥離等を起こした場合、その部分に電流が集中してしまい、整流特性が悪くなる。場合によっては、整流子自身が損傷を負い、交換を余儀なくされる場合がある。そのため、添加する二硫化モリブデンはカーボン基材とバインダーの合計量に対して０．５％以上、３％以下、好ましくは１．０％以上、２．０％以下の範囲内とすることが好ましい。これによって、ラジオノイズを規格以内に収めることが可能となる。二硫化モリブデンの添加量が０．５％より少ない場合は整流子との間の潤滑特性が悪くなりラジオノイズが発生し、また、３％より多い場合は整流子表面に形成される皮膜が過剰となり、整流特性が悪くなり、結果としてラジオノイズが発生する。
【００１３】
また、この二硫化モリブデンによって整流子表面に形成される皮膜を調整するために、ブラシ基材に研削剤の役目をする炭化ケイ素を添加する。この炭化ケイ素も量が多い場合や、粒径が大きすぎたり、均一に分散せずに、凝集したりした場合には、整流子表面を傷つけ、ラジオノイズの発生の要因の一つとなる。そのため、添加する炭化ケイ素はカーボン基材とバインダーの合計量に対して０．１％以上、０．５％以下、好ましくは０．１％以上、０．３％以下の範囲内が好ましい。０．１％より少ないと、効果が発揮されず、また、０．５％より多いと整流子表面を傷つける可能性が出てくるとともに、ブラシ温度が上昇し、整流子を焼損する場合があるためである。また、炭化ケイ素の粒径が、１００μｍよりも粗すぎると研削作用が強く、整流子表面が荒れる上に、整流子摩耗が多くなり、５μｍより細かいと整流子表面の皮膜の除去作用が低くなる。したがって、粒径は５〜１００μｍの範囲が好ましい。また、これら炭化ケイ素は、樹脂等との親和性、分散性が高いので、これらの添加は最初に潤滑剤と一緒に添加混合しても、混捏、粉砕後に添加混合してもよい。
【００１４】
このように、カーボン基材に、二硫化モリブデン及び炭化ケイ素を所定の割合で添加することによって、二硫化モリブデンの有する潤滑性と、炭化ケイ素の有する整流子表面の被膜調整機能が相互に作用しあって、整流特性が安定し、ラジオノイズの発生を抑制することができる。
【００１５】
【実施例】
以下に、実施例を挙げ、本発明を詳しく説明する。なお、本発明は以下の実施例に限定されるものではない。
【００１６】
（実施例１）
平均粒径４０μｍ、灰分０．１％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末を１％と、平均粒径５０μｍの炭化ケイ素０．１５％とを混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００１７】
（実施例２）
平均粒径４０μｍ、灰分０．１％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末を１％と、平均粒径５０μｍの炭化ケイ素０．３％とを混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００１８】
（実施例３）
平均粒径４０μｍ、灰分０．１％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末を２％と、平均粒径５０μｍの炭化ケイ素０．１５％とを混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００１９】
（実施例４）
平均粒径４０μｍ、灰分０．１％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末を０．５％と、平均粒径５０μｍの炭化ケイ素０．１５％とを混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００２０】
（実施例５）
平均粒径４０μｍ、灰分０．１％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末を３％と、平均粒径５０μｍの炭化ケイ素０．１５％とを混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００２１】
（比較例１）
平均粒径４０μｍ、灰分０．２％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して平均粒径５０μｍの炭化ケイ素０．１５％を混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００２２】
（比較例２）
平均粒径４０μｍ、灰分０．２％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末を１％と、平均粒径７５μｍ以下のアルミニウム粉末１％とを混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００２３】
（比較例３）
平均粒径４０μｍ、灰分０．２％以下の人造黒鉛粉８０質量部と、人造黒鉛粉と後述するバインダーとなる汎用性エポキシ樹脂との合計量に対して二硫化モリブデン粉末０．５％を混合し、これに汎用性エポキシ樹脂２０質量部を加えて常温で１時間混捏した。その後、粒径が４００μｍ以下になるように粉砕し、２００ＭＰａの圧力で７×１１×３０ｍｍの寸法に型押し成形した。次に、この成形体を２００℃で硬化し、カーボンブラシを得た。
【００２４】
実施例１〜５及び比較例１〜３の各々のブラシについて、ＣＩＳＰＲ１４規格に基づくＥＭＩ試験により、ＡＣ２３０Ｖ，５０Ｈｚ−１５ｍｉｎの条件で端子妨害電圧測定と妨害電力測定を実施した。端子妨害電圧測定の結果を表１及び図１、図２に示し、妨害電力測定の結果を表２及び図３に示した。なお、図２は、図１の低周波数領域の拡大図である。
【００２５】
【表１】
【表２】
表１、表２及び図１乃至図３に示すように、カーボン基材に、二硫化モリブデンをカーボン基材とバインダーとの合計量に対して０．５％以上、３％以下となるように添加し、炭化ケイ素をカーボン基材とバインダーとの合計量に対して０．１％以上、０．５％以下となるように添加した実施例１〜５に係るカーボンブラシは、欧米諸国でのラジオノイズの規格以下であった。
【００２８】
【発明の効果】
本発明は以上のように構成されており、カーボン基材に、二硫化モリブデン及び炭化ケイ素を所定の割合で添加することによって、ラジオノイズが低減し、無線妨害特性が安定的に改善される効果を得ることができる。
【図面の簡単な説明】
【図１】本実施例に係るカーボンブラシの端子妨害電圧測定の結果を示す図である。
【図２】図１における低周波数領域の拡大図である。
【図３】本実施例に係るカーボンブラシの妨害電力測定の結果を示す図である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a carbon brush for an electric machine, and more particularly, to a carbon brush for a commutator motor such as a power tool or a vacuum cleaner having improved radio interference characteristics.
[0002]
[Prior art]
Conventionally, as described in Patent Document 1, a carbon brush for an electric machine of this type is obtained by adding a solid lubricant and a grinding agent to a carbon base material and forming an electrically conductive metal on the entire surface except for a contact portion with a commutator. The development has been made with a primary focus on suppressing the rise in temperature of the brush and maintaining a stable rectifying effect over a long period of time by coating. In addition, oil impregnation of the brush base material has been studied to improve the radio interference characteristics.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-197315
[Problems to be solved by the invention]
However, in recent years, carbon brushes for commutator motors such as vacuum cleaners and electric tools have recently been particularly reduced in size, increased in output, and increased in rotation speed. Therefore, there has been a demand for a carbon brush which has a small resistance loss and a small abrasion in spite of its small size.
[0005]
On the other hand, a carbon brush corresponding to such a demand tends to generate radio noise. When radio noise is generated, it may affect nearby electrical equipment, for example, causing malfunctions.Therefore, in countries including Japan, especially in Europe and the United States, strict standards have been set for the generation of radio noise, and radio noise Measures have been taken against
[0006]
Therefore, an object of the present invention is to provide a carbon brush in which the occurrence of radio noise is suppressed and the radio interference characteristic is improved.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have found that the addition of molybdenum disulfide and silicon carbide to a carbon substrate of a brush within a predetermined amount improves radio interference characteristics. Was completed.
[0008]
That is, the carbon brush of the present invention is one in which molybdenum disulfide and silicon carbide are added as additives to the carbon base material to improve the radio interference characteristics. Further, molybdenum disulfide is added so as to be 0.5% or more and 3% or less based on the total amount of the carbon base material and the binder, and silicon carbide is added to the total amount of the carbon base material and the binder. Is added so as to be 0.1% or more and 0.5% or less. Further, the binder is a thermosetting resin or a pitch.
[0009]
Examples of the carbon substrate in the present invention include natural graphite, expanded graphite, artificial graphite, and the like. Among them, artificial graphite, which does not have a very high crystallinity, is particularly preferable. Further, graphite particles obtained by mixing these may be used. Further, the form thereof such as scaly graphite and earthy graphite is not particularly limited. By using these carbon base materials and adjusting the mixing conditions, firing conditions, and the like in the production stage, the brush base material can have a desired specific resistance.
[0010]
As the binder for binding the graphite particles, a general thermosetting resin can be used. For example, a solid or liquid epoxy resin, a phenol resin, and various types of thermosetting resins obtained by modifying these resins can be used. A curable resin or the like can be used. These resins preferably use 10 to 40% as a binder component.
[0011]
When molybdenum disulfide added as an additive is mixed alone with a resin or the like, it tends to aggregate due to the influence of static electricity or the like, and is difficult to be uniformly dispersed in the resin. However, in the present invention, since the particles are mixed with graphite particles having electrical conductivity, aggregation due to static electricity is extremely reduced. Further, the mixture is kneaded with a binder, and then pulverized. For this reason, molybdenum disulfide is completely dispersed by the mechanochemical effect, and is firmly bonded to the binder and the graphite particles. The mixed powder containing the graphite particles as a main component obtained in this way is molded and heat-treated to obtain a brush base material.
[0012]
However, brushes containing molybdenum disulfide tend to form a coating on the commutator surface during use. If this film is too thick, it will be easy to peel off. Then, when peeling or the like occurs partially, current concentrates on that part, and the rectification characteristics deteriorate. In some cases, the commutator itself may be damaged and must be replaced. Therefore, the amount of molybdenum disulfide to be added is preferably 0.5% or more and 3% or less, more preferably 1.0% or more and 2.0% or less based on the total amount of the carbon base material and the binder. . This makes it possible to keep radio noise within the standard. If the addition amount of molybdenum disulfide is less than 0.5%, the lubricating property between the commutator and radio noise is deteriorated, and if it is more than 3%, the film formed on the commutator surface is excessive. And the rectification characteristics deteriorate, and as a result, radio noise occurs.
[0013]
Further, in order to adjust a film formed on the commutator surface by the molybdenum disulfide, silicon carbide serving as an abrasive is added to the brush base material. When the amount of the silicon carbide is too large, when the particle size is too large, or when the silicon carbide is aggregated without being uniformly dispersed, the surface of the commutator is damaged, which is one of the causes of radio noise. Therefore, the amount of silicon carbide to be added is preferably 0.1% or more and 0.5% or less, and more preferably 0.1% or more and 0.3% or less based on the total amount of the carbon substrate and the binder. If it is less than 0.1%, the effect is not exhibited, and if it is more than 0.5%, there is a possibility that the commutator surface may be damaged, and the brush temperature increases, which may burn the commutator. That's why. If the particle size of the silicon carbide is too coarse than 100 μm, the grinding action is strong, the commutator surface is roughened, and the commutator wear is increased. If the particle size is smaller than 5 μm, the action of removing the film on the commutator surface is reduced. . Therefore, the particle size is preferably in the range of 5 to 100 μm. Further, since these silicon carbides have high affinity and dispersibility with resins and the like, they may be added and mixed together with a lubricant first, or may be added and mixed after kneading and pulverizing.
[0014]
As described above, by adding molybdenum disulfide and silicon carbide at a predetermined ratio to the carbon substrate, the lubricating property of molybdenum disulfide and the function of adjusting the coating on the commutator surface of silicon carbide interact. Accordingly, the rectification characteristics are stabilized, and the generation of radio noise can be suppressed.
[0015]
【Example】
Hereinafter, the present invention will be described in detail with reference to Examples. Note that the present invention is not limited to the following examples.
[0016]
(Example 1)
80% by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.1% or less, and 1% of molybdenum disulfide powder based on the total amount of artificial graphite powder and a general-purpose epoxy resin serving as a binder described later, 0.15% of silicon carbide having a particle size of 50 μm was mixed, and 20 parts by mass of a general-purpose epoxy resin was added thereto and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0017]
(Example 2)
80% by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.1% or less, and 1% of molybdenum disulfide powder based on the total amount of artificial graphite powder and a general-purpose epoxy resin serving as a binder described later, 0.3% of silicon carbide having a particle size of 50 μm was mixed, and 20 parts by mass of a general-purpose epoxy resin was added thereto and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0018]
(Example 3)
80% by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.1% or less, and 2% of molybdenum disulfide powder based on the total amount of artificial graphite powder and a general-purpose epoxy resin serving as a binder described later, 0.15% of silicon carbide having a particle size of 50 μm was mixed, and 20 parts by mass of a general-purpose epoxy resin was added thereto and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0019]
(Example 4)
80 parts by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.1% or less, and 0.5% of molybdenum disulfide powder with respect to the total amount of the artificial graphite powder and a general-purpose epoxy resin serving as a binder described later. And 0.15% of silicon carbide having an average particle size of 50 μm, and 20 parts by mass of a general-purpose epoxy resin was added thereto, followed by kneading at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0020]
(Example 5)
80 parts by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.1% or less, and 3% of molybdenum disulfide powder with respect to the total amount of artificial graphite powder and a general-purpose epoxy resin serving as a binder described below, 0.15% of silicon carbide having a particle size of 50 μm was mixed, and 20 parts by mass of a general-purpose epoxy resin was added thereto and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0021]
(Comparative Example 1)
80 parts by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.2% or less, and silicon carbide 0.15 having an average particle size of 50 μm with respect to the total amount of the artificial graphite powder and a general-purpose epoxy resin serving as a binder described later. %, And 20 parts by mass of a general-purpose epoxy resin was added thereto and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0022]
(Comparative Example 2)
80% by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.2% or less, and 1% of molybdenum disulfide powder with respect to the total amount of artificial graphite powder and a general-purpose epoxy resin serving as a binder described below. 1% of aluminum powder having a particle size of 75 μm or less was mixed, and 20 parts by mass of a general-purpose epoxy resin was added thereto and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0023]
(Comparative Example 3)
80 parts by mass of artificial graphite powder having an average particle size of 40 μm and an ash content of 0.2% or less, and 0.5% of molybdenum disulfide powder mixed with the total amount of the artificial graphite powder and a general-purpose epoxy resin serving as a binder described below. Then, 20 parts by mass of a general-purpose epoxy resin was added and kneaded at room temperature for 1 hour. Then, it was pulverized so that the particle size became 400 μm or less, and embossed to a size of 7 × 11 × 30 mm at a pressure of 200 MPa. Next, this molded body was cured at 200 ° C. to obtain a carbon brush.
[0024]
For each of the brushes of Examples 1 to 5 and Comparative Examples 1 to 3, the terminal interference voltage measurement and the interference power measurement were performed by an EMI test based on the CISPR14 standard under the conditions of 230 VAC and 50 Hz for 15 minutes. The results of the terminal interference voltage measurement are shown in Table 1 and FIGS. 1 and 2, and the results of the interference power measurement are shown in Table 2 and FIG. FIG. 2 is an enlarged view of the low frequency region of FIG.
[0025]
[Table 1]
[Table 2]
As shown in Tables 1 and 2, and FIGS. 1 to 3, molybdenum disulfide is added to the carbon base material in an amount of 0.5% or more and 3% or less based on the total amount of the carbon base material and the binder. The carbon brushes according to Examples 1 to 5 in which silicon carbide was added in an amount of 0.1% or more and 0.5% or less based on the total amount of the carbon base material and the binder, It was below the radio noise standard.
[0028]
【The invention's effect】
The present invention is configured as described above. By adding molybdenum disulfide and silicon carbide at a predetermined ratio to a carbon base material, radio noise is reduced, and radio interference characteristics are stably improved. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a result of a terminal interference voltage measurement of a carbon brush according to an embodiment.
FIG. 2 is an enlarged view of a low frequency region in FIG.
FIG. 3 is a diagram illustrating a result of measurement of interference power of the carbon brush according to the present embodiment.
Claims (3)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002323279A JP4152726B2 (en) | 2002-11-07 | 2002-11-07 | Carbon brush |
| GB0311986A GB2389358B (en) | 2002-06-06 | 2003-05-23 | Carbon brush |
| DE10324855.2A DE10324855B4 (en) | 2002-06-06 | 2003-06-02 | carbon brush |
| IT000422A ITTO20030422A1 (en) | 2002-06-06 | 2003-06-05 | CARBON BRUSH |
| CNB031386652A CN100375343C (en) | 2002-06-06 | 2003-06-06 | Carbno brush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002323279A JP4152726B2 (en) | 2002-11-07 | 2002-11-07 | Carbon brush |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004159437A true JP2004159437A (en) | 2004-06-03 |
| JP4152726B2 JP4152726B2 (en) | 2008-09-17 |
Family
ID=32803177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002323279A Expired - Fee Related JP4152726B2 (en) | 2002-06-06 | 2002-11-07 | Carbon brush |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4152726B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006320067A (en) * | 2005-05-11 | 2006-11-24 | Hitachi Chem Co Ltd | Process of metal graphite brush |
| JP2012513024A (en) * | 2008-12-19 | 2012-06-07 | エスコム ホールディングス エスオーシー リミテッド | Method and system for monitoring shaft signals of rotating machinery |
| US10199789B2 (en) | 2013-10-02 | 2019-02-05 | Totan Kako Co. Ltd. | Metal-carbonaceous brush and method of manufacturing the same |
-
2002
- 2002-11-07 JP JP2002323279A patent/JP4152726B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006320067A (en) * | 2005-05-11 | 2006-11-24 | Hitachi Chem Co Ltd | Process of metal graphite brush |
| JP2012513024A (en) * | 2008-12-19 | 2012-06-07 | エスコム ホールディングス エスオーシー リミテッド | Method and system for monitoring shaft signals of rotating machinery |
| JP5913724B1 (en) * | 2008-12-19 | 2016-04-27 | エスコム ホールディングス エスオーシー リミテッド | Method and system for monitoring shaft signals of rotating machinery |
| US10199789B2 (en) | 2013-10-02 | 2019-02-05 | Totan Kako Co. Ltd. | Metal-carbonaceous brush and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4152726B2 (en) | 2008-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1315254B1 (en) | Carbon brush for electric machine | |
| JP5825705B2 (en) | Carbon brush | |
| KR102098193B1 (en) | Carbon brush for motor using surface modified graphite powder and method for preparing the same | |
| CN100375343C (en) | Carbno brush | |
| US10903613B2 (en) | Resin bonded carbonaceous brush and method of manufacturing the same | |
| WO2007055164A1 (en) | Carbon brush of motor and method for producing the same | |
| JP2000197315A (en) | Carbon brush for electric machine | |
| JP2008259352A (en) | Carbon rectifier and carbon brush for fuel pump, and fuel pump with built-in carbon rectifier and carbon brush | |
| JP2004159437A (en) | Carbon brush | |
| CN100521404C (en) | Carbon brush | |
| JP4533513B2 (en) | Carbon brush for electric machine | |
| CN104365002A (en) | Metal-carbonaceous brush and method for producing same | |
| JP2007325401A (en) | Carbon brush and manufacturing method therefor | |
| JP2004099782A (en) | Carbon brush | |
| JP6137835B2 (en) | Carbon brush for fuel pump and manufacturing method thereof | |
| US7094366B2 (en) | Resin-bonded graphite material, method for the production of a resin bonded graphite material and use thereof | |
| US10199789B2 (en) | Metal-carbonaceous brush and method of manufacturing the same | |
| JPH07213022A (en) | Preparation of metal graphite quality brush | |
| JP2005176492A (en) | Brush for dc motor | |
| JP2002084715A (en) | Carbon brush for electric machine | |
| JP2004312803A (en) | Carbon brush | |
| JPH114563A (en) | Carbon brush | |
| WO2024122575A1 (en) | Copper carbon brush | |
| JP2003347006A (en) | Metallic graphite brush | |
| JP2004307563A (en) | Carbon brush and its manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050524 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20061218 |
|
| A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A712 Effective date: 20061218 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20061218 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070213 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070406 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20080304 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080311 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080512 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20080701 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080702 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4152726 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110711 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110711 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120711 Year of fee payment: 4 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120711 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130711 Year of fee payment: 5 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |