JPH04368446A - Grounding device for shaft of electric rotating machine - Google Patents
Grounding device for shaft of electric rotating machineInfo
- Publication number
- JPH04368446A JPH04368446A JP3145029A JP14502991A JPH04368446A JP H04368446 A JPH04368446 A JP H04368446A JP 3145029 A JP3145029 A JP 3145029A JP 14502991 A JP14502991 A JP 14502991A JP H04368446 A JPH04368446 A JP H04368446A
- Authority
- JP
- Japan
- Prior art keywords
- rotating shaft
- silver
- shaft
- grounding device
- electric brush
- 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
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052709 silver Inorganic materials 0.000 claims abstract description 22
- 239000004332 silver Substances 0.000 claims abstract description 22
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 5
- 239000004020 conductor Substances 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 6
- 238000007751 thermal spraying Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 244000145845 chattering Species 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Motor Or Generator Frames (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、回転電機の回転軸接
地装置、特に回転軸の外周表面に取付けられる導電材の
構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft grounding device for a rotating electric machine, and more particularly to the structure of a conductive material attached to the outer peripheral surface of the rotating shaft.
【０００２】0002
【従来の技術】回転電機は運転中回転子に静電荷が発生
する。また回転子の回転軸は軸受によって軸支しされて
おり、軸受部には潤滑油膜が形成されているので回転子
と固定子との間には電位差が生じる。この電位差によっ
て回転子の金属部に電解腐食を生じる。そのため回転子
の静電荷を大地に逃してやらなければならない。その方
法として回転軸に電刷子を接触させ電刷子に接地工事を
施して静電荷を大地に逃していた。しかしながら電刷子
を直接回転軸に接触させたのでは両者間の接触抵抗値が
大きくなり接地効果が減少するので、図３及び図４に示
すように、回転軸の外周表面に導電材を取付け、この導
電材に電刷子を摺動させることが行われている。2. Description of the Related Art Static charges are generated on the rotor of a rotating electric machine during operation. Further, the rotating shaft of the rotor is supported by a bearing, and a lubricating oil film is formed on the bearing, so that a potential difference occurs between the rotor and the stator. This potential difference causes electrolytic corrosion in the metal parts of the rotor. Therefore, the static charge of the rotor must be dissipated to the ground. As a method of doing this, an electric brush was brought into contact with the rotating shaft, and the electric brush was grounded to release the static charge to the ground. However, if the electric brush is brought into direct contact with the rotating shaft, the contact resistance value between the two will increase and the grounding effect will decrease. Therefore, as shown in Figs. 3 and 4, a conductive material is attached to the outer peripheral surface of the rotating shaft. An electric brush is slid onto this conductive material.
【０００３】図３はこのような接地装置を備えた回転軸
部分の側面図、図４は図３のＰ矢視図である。すなわち
、回転軸１の外周面に銀（または銅）板２を巻付け、こ
の円周上に電刷子３を摺動接触させる。この電刷子３は
刷子ホルダー４に保持され、この刷子ホルダー４に取付
けられたばねのばね圧により常時銀板２面に押圧され電
気的に接触されている。また電刷子３からはリード線５
が引出され、このリード線５は接地されている。FIG. 3 is a side view of a rotating shaft portion equipped with such a grounding device, and FIG. 4 is a view taken along arrow P in FIG. That is, a silver (or copper) plate 2 is wound around the outer peripheral surface of the rotating shaft 1, and an electric brush 3 is brought into sliding contact with the circumference of the silver (or copper) plate 2. This electric brush 3 is held by a brush holder 4, and is constantly pressed against the silver plate 2 surface by the spring pressure of a spring attached to this brush holder 4 so as to be in electrical contact with it. Also, from the electric brush 3, the lead wire 5
is drawn out, and this lead wire 5 is grounded.
【０００４】0004
【発明が解決しようとする課題】このような従来の構造
では電刷子３と銀板２とは常にばね力により密着してお
り両者間の接触抵抗値が低くなり良好である。しかしな
がら回転軸１に巻かれる銀板２はその工作方法如何によ
り回転軸１との接触度にバラツキがあり、したがって両
者間の接触抵抗値は必ずしも一定しない。さらに大容量
機では回転子径もも大きく、周速も早くなり、電刷子接
触抵抗の増大、電刷子の損傷、チャタリング摺動面の損
傷が発生する可能性がある。In such a conventional structure, the electric brush 3 and the silver plate 2 are always in close contact with each other due to the spring force, and the contact resistance between them is low and good. However, the degree of contact between the silver plate 2 wound around the rotating shaft 1 varies depending on its working method, and therefore the contact resistance value between the two is not necessarily constant. Furthermore, in large-capacity machines, the rotor diameter is large and the circumferential speed is high, which may increase electric brush contact resistance, damage the electric brush, and damage the chattering sliding surface.
【０００５】この発明の目的は上述した問題点に鑑み、
電刷子と回転軸との接触抵抗値を極力低くして接地効果
が顕著な回転電機の回転軸接地装置を提供することにあ
る。[0005] In view of the above-mentioned problems, the object of the present invention is to
To provide a rotating shaft grounding device for a rotating electrical machine that has a remarkable grounding effect by minimizing the contact resistance between an electric brush and a rotating shaft.
【０００６】[0006]
【課題を解決するための手段】この発明では、回転電機
の回転軸の外周表面に導電材を取付け、この導電材に電
刷子を摺動させるとともにこの電刷子を接地して回転軸
を接地するものにおいて、導電材を回転軸の外周表面に
銀溶射処理を施して形成する。さらに銀溶射処理の下地
処理（前処理）としてニッケルアルミ材を溶射する。さ
らにまたかかる構成において、銀溶射処理後その外周表
面を機械加工やローラ掛けなどにより平滑化する。[Means for Solving the Problems] In this invention, a conductive material is attached to the outer peripheral surface of a rotating shaft of a rotating electric machine, and an electric brush is slid on this conductive material, and the electric brush is grounded to ground the rotating shaft. In this method, a conductive material is formed on the outer circumferential surface of the rotating shaft by subjecting it to a silver spraying process. Furthermore, nickel-aluminum material is thermally sprayed as a base treatment (pretreatment) for silver thermal spraying. Furthermore, in such a configuration, after the silver thermal spraying treatment, the outer peripheral surface is smoothed by machining, rolling, etc.
【０００７】[0007]
【作用】この発明の構成によれば、導電材を回転軸の外
周表面に銀溶射処理を施して形成たので銀と回転軸との
間の接触抵抗値は極めて小さくなる。さらに銀溶射処理
の下地処理（前処理）としてニッケルアルミ材を溶射し
たので回転軸の外周表面と導電材との密着性が極めてよ
い。また銀溶射表面は機械加工やローラ掛けなどにより
平滑化されるのでこれに摺動される電刷子との密着性も
よく両者間の接触抵抗値は低くなる。According to the structure of the present invention, since the conductive material is formed by spraying silver onto the outer peripheral surface of the rotating shaft, the contact resistance between the silver and the rotating shaft becomes extremely small. Furthermore, since a nickel-aluminum material was sprayed as a base treatment (pretreatment) for the silver spraying process, the adhesion between the outer peripheral surface of the rotating shaft and the conductive material was extremely good. In addition, since the silver sprayed surface is smoothed by machining or rolling, it has good adhesion to the electric brush that is slid on it, and the contact resistance between the two is low.
【０００８】[0008]
【実施例】図１はこの発明の一実施例である接地装置を
備えた回転軸部分の側面図、図２は図１のＱ矢視図で、
図１，図２と同一符号で示すものは同一部品である。こ
の実施例が従来例と異なる点は回転軸に取付けられる導
電材の構成である。すなわち、回転軸１の外周表面には
下地処理としてニッケルアルミ材２Ａが溶射されている
。この下地処理は後述する銀の密着性をよくするために
行なうもので、溶射されたニッケルアルミ材２Ａの外周
表面に銀２Ｂが溶射されている。銀２Ｂを溶射した外周
表面は機械加工（研削，超仕上げなど）やローラ掛けな
どによって平滑化される。このように平滑化された銀２
Ｂ外周表面を電刷子３が摺動することにより回転軸１は
接地されながら運転される。[Embodiment] Fig. 1 is a side view of a rotating shaft portion equipped with a grounding device according to an embodiment of the present invention, and Fig. 2 is a view taken in the direction of arrow Q in Fig. 1.
Components indicated by the same symbols as in FIGS. 1 and 2 are the same parts. This embodiment differs from the conventional example in the configuration of the conductive material attached to the rotating shaft. That is, the outer peripheral surface of the rotating shaft 1 is thermally sprayed with a nickel-aluminum material 2A as a base treatment. This base treatment is performed to improve the adhesion of silver, which will be described later, and silver 2B is sprayed on the outer peripheral surface of the sprayed nickel-aluminum material 2A. The outer circumference surface sprayed with silver 2B is smoothed by machining (grinding, superfinishing, etc.) or rolling. Silver 2 smoothed like this
B The rotating shaft 1 is operated while being grounded by the electric brush 3 sliding on the outer circumferential surface.
【０００９】[0009]
【発明の効果】この発明では回転軸に銀溶射を行なって
導電材を形成したので導電材と電刷子との接触性がよい
。また下地処理を施したのち銀溶射を行なったので導電
材の密着性が極めてよい。さらに銀溶射表面を平滑に加
工することにより摺動される電刷子との接触性もよくな
り両者間の接触抵抗値は低くなる。これらにより回転軸
と大地との接地抵抗値が小さくなり、回転軸の静電荷を
大地に容易に逃がすことができる。[Effects of the Invention] In the present invention, since a conductive material is formed on the rotating shaft by spraying silver, the contact between the conductive material and the electric brush is good. Furthermore, since the silver spraying was performed after the base treatment, the adhesion of the conductive material was extremely good. Furthermore, by smoothing the silver sprayed surface, the contact with the sliding electric brush becomes better, and the contact resistance between the two becomes lower. These reduce the grounding resistance between the rotating shaft and the earth, and the static charge on the rotating shaft can be easily released to the earth.
【図１】この発明の一実施例である回転軸接地装置を備
えた回転軸部分の側面図FIG. 1 is a side view of a rotating shaft portion equipped with a rotating shaft grounding device that is an embodiment of the present invention.
【図２】図１のＱ矢視図[Figure 2] Q arrow view in Figure 1
【図３】従来の回転軸接地装置を備えた回転軸部分の側
面図[Figure 3] Side view of a rotating shaft portion equipped with a conventional rotating shaft grounding device
【図４】図３のＰ矢視図[Figure 4] P arrow view in Figure 3
１ 回転軸
２Ａ ニッケルアルミ材（溶射された）２Ｂ 銀（
溶射された）
３ 電刷子1 Rotating shaft 2A Nickel aluminum material (sprayed) 2B Silver (
thermal sprayed) 3 electric brush
Claims (3)
付け、この導電材に電刷子を摺動させるとともにこの電
刷子を接地して回転軸を接地するものにおいて、導電材
を回転軸の外周表面に銀溶射処理を施して形成したこと
を特徴とする回転電機の回転軸接地装置。Claim 1: A rotating electric machine in which a conductive material is attached to the outer circumferential surface of a rotating shaft, an electric brush is slid on the conductive material, and the electric brush is grounded to ground the rotating shaft. A rotating shaft grounding device for a rotating electric machine, characterized in that the outer peripheral surface of the rotating shaft is formed by applying a silver spraying treatment.
の下地処理（前処理）としてニッケルアルミ材を溶射し
たことを特徴とする回転電機の回転軸接地装置。2. A rotating shaft grounding device for a rotating electric machine according to claim 1, wherein a nickel-aluminum material is thermally sprayed as a base treatment (pretreatment) for silver thermal spraying.
溶射処理後その外周表面を機械加工やローラ掛けなどに
より平滑化したことを特徴とする回転電機の回転軸接地
装置。3. A rotating shaft grounding device for a rotating electrical machine according to claim 1, wherein the outer circumferential surface is smoothed by machining or roller application after being sprayed with silver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3145029A JP2924300B2 (en) | 1991-06-18 | 1991-06-18 | Rotary shaft grounding device for rotating electrical machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3145029A JP2924300B2 (en) | 1991-06-18 | 1991-06-18 | Rotary shaft grounding device for rotating electrical machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04368446A true JPH04368446A (en) | 1992-12-21 |
| JP2924300B2 JP2924300B2 (en) | 1999-07-26 |
Family
ID=15375769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3145029A Expired - Lifetime JP2924300B2 (en) | 1991-06-18 | 1991-06-18 | Rotary shaft grounding device for rotating electrical machines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2924300B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008130851A1 (en) | 2007-04-23 | 2008-10-30 | Illinois Tool Works Inc. | Improved grounding brush system for mitigating electrical current on rotating shafts |
| US8107260B2 (en) | 2007-11-15 | 2012-01-31 | Illinois Tool Works Inc. | EMI shielding and environmental seal device |
| US8169766B2 (en) | 2003-03-17 | 2012-05-01 | Illinois Tool Works, Inc. | Shaft current control brush ring assembly |
| US20130099624A1 (en) * | 2006-03-17 | 2013-04-25 | Inpro/Seal Llc | Current Diverter Ring |
| EP3982520A1 (en) * | 2020-10-06 | 2022-04-13 | ZF Friedrichshafen AG | Arrangement for sealing and grounding a shaft for a transmission, for an electric machine, or for an electric axle drive unit |
-
1991
- 1991-06-18 JP JP3145029A patent/JP2924300B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8169766B2 (en) | 2003-03-17 | 2012-05-01 | Illinois Tool Works, Inc. | Shaft current control brush ring assembly |
| US8199453B2 (en) | 2003-03-17 | 2012-06-12 | Illinois Tool Works Inc. | Shaft current control brush ring assembly |
| US20130099624A1 (en) * | 2006-03-17 | 2013-04-25 | Inpro/Seal Llc | Current Diverter Ring |
| US8664812B2 (en) * | 2006-03-17 | 2014-03-04 | Inpro/Seal Llc | Current diverter ring |
| WO2008130851A1 (en) | 2007-04-23 | 2008-10-30 | Illinois Tool Works Inc. | Improved grounding brush system for mitigating electrical current on rotating shafts |
| JP2010525787A (en) * | 2007-04-23 | 2010-07-22 | イリノイ トゥール ワークス インコーポレイティド | Improved ground brush system for reducing rotating shaft current |
| US8189317B2 (en) | 2007-04-23 | 2012-05-29 | Illinois Tool Works Inc. | Grounding brush system for mitigating electrical current on rotating shafts |
| US8107260B2 (en) | 2007-11-15 | 2012-01-31 | Illinois Tool Works Inc. | EMI shielding and environmental seal device |
| EP3982520A1 (en) * | 2020-10-06 | 2022-04-13 | ZF Friedrichshafen AG | Arrangement for sealing and grounding a shaft for a transmission, for an electric machine, or for an electric axle drive unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2924300B2 (en) | 1999-07-26 |
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