CN1917304A - Shaft current control brush assembly with drainage - Google Patents
Shaft current control brush assembly with drainage Download PDFInfo
- Publication number
- CN1917304A CN1917304A CN 200610108310 CN200610108310A CN1917304A CN 1917304 A CN1917304 A CN 1917304A CN 200610108310 CN200610108310 CN 200610108310 CN 200610108310 A CN200610108310 A CN 200610108310A CN 1917304 A CN1917304 A CN 1917304A
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- baffle
- main shaft
- outer baffle
- current control
- wall
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Abstract
A shaft current control brush ring assembly includes a channel and a brush ring assembly secured within the channel. A drain is provided to direct liquids and contaminants away from said brush ring assembly.
Description
The cross-reference of related application
The application requires the priority of No. 60/709021 provisional application of the U.S. of submission on August 17th, 2005.
Technical field
The present invention relates generally to earthing device, particularly be used to be electrically connected to and produce the earthing device that electric charge maybe can stand electric machine main shaft, main turbine shaft and other rotating spindle on the parts that electric charge gathers.
Background technology
The axle induced current results from the motor, and results from usually in the three phase electric machine that is driven by variable speed drive.Variable speed drive utilizes the pulse-width regulated technology to change the speed of alternating current machine, thereby allows cheap alternating current machine to be used for using in the past the application of more expensive direct current machine.The shortcoming that use has the alternating current machine of variable speed drive is: produce higher common-mode voltage (CMV) by variable speed drive, this has increased the axle induced current.
Voltage induced on the motor shaft goes out electric current, and the electric current main shaft bearing of flowing through arrives motor frame, flows to the earth then.When motor rotation, bearing becomes and more hinders electric current and flow, thereby causes electric charge to accumulate in the main shaft surface.After the short period section, CMV causes electric charge to accumulate to higher level.Because electric charge surpasses the threshold level in minimum resistance path, so discharge or instantaneous springing up through the minimum resistance path sometimes by the electric energy of the ball bearing on the main shaft.This release causes edm, if bearing is passed in the minimum resistance path, then this can damage the ball in bearing race and the bearing.Electric energy springs up the molten hole of generation, and the particulate that the formation of molten hole is produced is retained in sealed bearing inside.Molten hole in the bearing and microparticle material play the free smooth effect of rotating of disturbing bearing, and this can cause physical damnification and permanent bearing failure.
Used multiple mitigation strategy to attempt to overcome this problem.Known trial comprises the bearing grease that uses conduction, the bearing and the use copper/phosphorus brush and the Faraday shield of insulation.Somewhat cost-effective solution commonly used is to use to the earth and provides the copper brush that spring is housed of continuous current to make main shaft ground connection.Copper brush can wear and tear fast, thereby needs frequent periodic maintenance and replacing.In addition, accumulating in oxide on the main shaft and other barrier between brush and the main shaft has reduced electric current and has caused the springing up through brush and main shaft of electric energy.The brush of loading spring also trends towards vibrating because of the friction law between brush and the main shaft surface changes.No matter why and the vibration of the brush that produces all can cause not wishing the spark that occurs.
Above-mentioned related application discloses the grounding brush that comprises conductive filament in the support around the main shaft.Brush can be used as contactless ion generator with the electric charge on the rolling element of the main shaft that reduces to isolate or isolation.
Known have an another kind of grounding brush device.When being used as the continuous loop that surrounds main shaft, the grounding brush device can hold oil or other liquid of threaded shaft.The liquid that is received can disturb the operation and the function of grounding brush.Pollutant can enter into the bearing on the main shaft and can cause damage or decreased performance.Device is taken off so that to carry out periodic cleaning be consuming time and can not implement the equipment of continued operation basically.
What need in the prior art is the grounding system that can be effective to cycle time expand, and oil or other liquid are lodged near the main shaft that this system is installed.
Summary of the invention
The invention provides and have grounding brush device that is used for discharging tube that liquid is drained from device and the main shaft that device is installed.
One aspect of the present invention provides shaft current control brush ring assembly, and it is used to have the motor of panel and main shaft.Device comprise have foreign section, the groove of Internal baffle and outer baffle.Brushgear is in groove and remain between Internal baffle and the outer baffle.The discharging tube that is connected with outer baffle is drained pollutant from brushgear.
Another aspect of the present invention provides shaft current control brush ring assembly, and it has cylinder segment, and cylinder segment has the Internal baffle of inside guiding and has the outer baffle of inside guiding at a relative end at the one end, thereby forms cannelure.Brushgear is in groove and remain between Internal baffle and the outer baffle.The pollutant chamber comprises general cylindrical outer shroud that is connected with described outer baffle and the outer wall of inwardly guiding from outer shroud, and outer wall and described outer baffle are in the relative spacing relation.The discharging tube opening is formed on the outer wall.
In still another aspect of the invention, the invention provides motor with motor faceplate; Electric machine main shaft stretches out and shaft current control brush ring assembly encirclement main shaft from panel.Shaft current control brush ring assembly comprises Internal baffle and the outer baffle that is in relative spaced relationship.The opening of main shaft on Internal baffle and outer baffle extends.Brushgear is between Internal baffle and outer baffle; And discharging tube is connected so that pollutant is drained from brushgear with outer baffle.
Advantage of the present invention provides effective conduction brushgear does not accumulate the operation that can disturb earthing device and performance to reduce the shaft current on the rotating spindle oil or other liquid pollutant.
Another advantage of the present invention provides the earthing device that is used for electric machine main shaft, and earthing device plays effectively that prolongation is not keeped in repair, the effect of the time period of maintenance and repair.
Another advantage of the present invention provides the conduction brushgear, and the conduction brushgear provides the protection that does not contact with pollutant near the bearing the device on the main shaft, and this device and bearing are installed on the main shaft.
Another advantage of the present invention provides the discharging tube that is used for the earthing device on the motor.
Other features and advantages of the present invention will be by will be more obvious to those skilled in the art with reference to following detailed, claim and accompanying drawing, and wherein, same tag is used to represent same characteristic features.
Description of drawings
Fig. 1 is the phantom that has according to the motor of shaft current control brush ring assembly of the present invention.
Fig. 2 is the end cross-section of motor shaft shown in Fig. 1 and brush loop device.
Fig. 3 is the phantom with motor of shaft current control brush ring assembly according to a second embodiment of the present invention.
Fig. 4 is the phantom with motor of shaft current control brush ring assembly according to another embodiment of the present invention.
Fig. 5 is the phantom with motor of shaft current control brush ring assembly according to still another embodiment of the invention.
Before describing embodiment of the present invention in detail, should be appreciated that the invention is not restricted to be applied in describe below or illustrated structure detail and component configuration in.The present invention can have other embodiments, and can implement in many ways or carry out.It is also understood that phraseology and terminology used in this are used for explanation and do not will be understood that is to limit." comprise ", the use of " comprising " and modification thereof means and comprises after this listed object and equivalent thereof, and other object and equivalent thereof.
Embodiment
More specifically with reference to accompanying drawing and especially with reference to Fig. 1, mark 10 expressions are according to shaft current control brush ring assembly of the present invention now.Brush loop device 10 is installed on the main shaft 14 that also specifically is installed on motor 12 on the motor 12 to be used to eliminate the electric charge on the main shaft 16 that can accumulate in motor 12.It should be understood that brush loop device 10 can be provided as multiple different size to use in dissimilar motors and on the main shaft 16 of different-diameter.
Brush loop device 10 is generally annular to center on main shaft 16.Brush loop device 10 be fixed on the panel 14 and be operably mounted to main shaft 16 and panel 14 between to eliminate static or other electric charge in the operating process of motor 12, accumulate on the electric machine main shaft 16.
Brush loop device 10 comprises cannelure 20 and the brushgear 22 that is positioned at wherein.Groove 20 comprises columniform foreign section 24, the outer baffle 28 that foreign section 24 has Internal baffle 26 and extends to main shaft 16 from section 24.Foreign section 24, Internal baffle 26 and outer baffle 28 together form circular casing or the groove 20 that wherein is placed with brushgear 22.Groove 20 is made by electric conducting material, and for example metal includes but not limited to aluminium, stainless steel, bronze and brass.Groove 20 also can be made by conductive plastics.
Brushgear 22 comprises can be arranged as continuous substantially annular ring or the circular-arc a plurality of single fibrous conductor 30 that centers on the bundle of main shaft 16 individually.In one exemplary embodiment, each conductor 30 is by carbon fiber, stainless steel, the conductive plastics thin hair-like silk made of acrylic acid or nylon fiber for example, perhaps can have enough little silk with other conductive fiber type of causing Ionized diameter when electric field exists.In this embodiment, conductor 30 has usually less than about 150 microns diameter.In one arrangement, conductor 30 is to have about 5 microns conductive filaments to about 100 micrometer range interior diameters.Perhaps, conductor 30 can be to be retained as the bigger electric conducting material fiber that contacts with main shaft 16.
The accurate recesses machined 50 that comprises suitable diameter in the panel 14 is pushed in the layout so that groove 20 is contained in.Brushgear 22 is installed in the groove 20 in advance.The finishing device of brush loop device 10 is pressed into recess 50 and remains in wherein with the interference fit relation.The accurate processing of recess 50 is convenient to conductor 30 is located to realize the optimum performance of shaft current control brush ring assembly 10 accurately, best with respect to main shaft 16.Groove 20 can be taper or have chamfering so that groove 20 is inserted in the recess 50 in the junction of Internal baffle 26 and foreign section 24.
When mounted, conductor 30 can directly contact main shaft 16 with as grounding brush, so that electric charge directly is transferred to brush loop device 10 from main shaft 16.Perhaps, but conductor 30 minimallies and main shaft 16 is at interval, thereby owing to accumulate in the electric field that electric charge produced on the main shaft 16, and produces ion field, with allow electric charge from main shaft 16 indirect communication to conductor 30.In another suitable layout, the thin and light conductor 30 that uses sufficient length is to quit work at motor 10 or contact main shaft 16 during with low-speed handing.Because the speed of main shaft 16 increases in startup and use, so air-flow makes conductor 30 remove from main shaft 16.Eliminate or the CONTACT WITH FRICTION time between conductor 30 and the main shaft 16 of reducing reduces to wear and tear and prolongs life-span of conductor 30.Panel 14 is electrically connected with the earth, and the electric charge that accumulates on the main shaft 16 flows into the earth before brush loop device 10 is producing electric arc.
The liquid of the opening 46 that forms of flowing through between main shaft 16 and outer wall 44 outwards flows into pollutant chamber 40 because of the rotation of main shaft 16.Chamber 40 provides stagnant zone, mist drip can be in this zone in conjunction with and accumulate to discharge from drain hole 48.
Fig. 3 represents to be used for another embodiment of the present invention of brush loop device 60, and it is similar to the embodiment of the brush loop device 10 shown in Fig. 1 and 2.The corresponding construction of device in 60 represented by the reference marker identical with similar structures in the device 10.Essence is positioned on the main shaft 16 for main shaft seal body contiguous outer baffle 28 in chamber 40 of O shape ring 62.O shape ring 62 is with main shaft 16 rotations.The material that comes close to or in contact with O shape ring 62 will outwards be dished out to lodge in the chamber 40 by centrifugal force.O shape ring 62 provides around the sealing of main shaft 16, and further stops liquid or other pollutant from opening 38 processes, thereby conductor 30 is provided the protection of improvement.Perhaps, O shape ring 62 can be positioned near outer wall 44.As the another embodiment shown in Fig. 5, O shape ring 62 can be present in the narrow chamber 64, thus 62 slipper seals that provide with respect to outer baffle 28 and outer wall 44 of O shape ring.
Fig. 4 represents to be used for further embodiment of this invention of brush loop device 70.Drain hole 72 is provided in the outer baffle 74, and the pollutant chamber that does not isolate is provided.Drain hole 72 and baffle plate 74, extend enough distances to receive liquid stream from the inside diameter surface 34 of fixed structure 32 from opening 76.Brush loop device 70 can be advantageously used in axial space and be restricted to installation on the main shaft 16, and has the utilized space that is not enough to form the pollutant chamber.
Represented herein and describe accumulate the chamber and the discharging tube notion can be used for installing rather than the grounding brush device.For example, use can be united to be used for that pollutant is not used the grounding brush device even from the bearing discharge with bearing in current drainage and pollutant chamber.
Aforesaid change and modification are all within the scope of the present invention.Should be appreciated that all optional combinations of two or more independent characteristics that invention open at this and that limit can expand to this paper and/or accompanying drawing is mentioned or therefrom can obviously draw.All these are different constitutes a plurality of optional aspect of the present invention.Embodiment described here has been explained and has been implemented known best mode of the present invention, and can make those skilled in the art use the present invention.Will be understood that claim has comprised the optional embodiment in the prior art allowed band.
Various feature of the present invention is listed in the claim of enclosing.
Claims (20)
1. shaft current control brush ring assembly is used to have the motor of panel and main shaft, and described device comprises:
Groove has foreign section, Internal baffle and outer baffle;
Brushgear is in described groove and remain between described Internal baffle and the described outer baffle; And
Discharging tube is connected so that pollutant is drained from described brushgear with described outer baffle.
2. shaft current control brush ring assembly according to claim 1 comprises:
The pollutant chamber that described outer baffle is outer, and described chamber has the discharging tube opening from its extension.
3. shaft current control brush ring assembly according to claim 2, described pollutant chamber is formed between described outer baffle, outer wall and the outer shroud, and outer wall and described outer baffle are in the relative spacing relation, and outer shroud is between described outer baffle and described outer wall.
4. shaft current control brush ring assembly according to claim 3, described discharging tube opening passes described outer wall.
5. shaft current control brush ring assembly according to claim 4 comprises the main shaft seal body that is arranged in described chamber.
6. shaft current control brush ring assembly according to claim 5, described main shaft seal body is against described outer baffle setting.
7. shaft current control brush ring assembly according to claim 5, described main shaft seal body is against described outer wall setting.
8. shaft current control brush ring assembly according to claim 5, described main shaft seal body is against described outer baffle and described outer wall setting.
9. shaft current control brush ring assembly according to claim 1, described discharging tube comprise the discharging tube opening in the described outer baffle.
10. shaft current control brush ring assembly comprises:
Cylinder segment, one end have the Internal baffle of inside guiding and have the outer baffle of inside guiding at a relative end, thereby form cannelure;
Brushgear is in described groove and remain between described Internal baffle and the described outer baffle;
The pollutant chamber comprises general cylindrical outer shroud that is connected with described outer baffle and the outer wall of inwardly guiding from outer shroud, and outer wall and described outer baffle are in the relative spacing relation; And
Discharging tube opening in outer wall.
11. device according to claim 10 comprises the O shape ring that is arranged in described chamber.
12. device according to claim 11, described O shape ring is against described outer baffle setting.
13. device according to claim 11, described O shape ring is against described outer wall setting.
14. device according to claim 11, described O shape ring is against described outer baffle and described outer wall setting.
15. a motor comprises:
Motor faceplate;
Electric machine main shaft stretches out from described panel;
Shaft current control brush ring assembly surrounds described main shaft, and described shaft current control brush ring assembly comprises:
Be in the Internal baffle and the outer baffle of relative spacing relation, described main shaft extends through the opening in described Internal baffle and described outer baffle;
Brushgear is between described Internal baffle and described outer baffle; And
Discharging tube is connected so that pollutant is drained from described brushgear with described outer baffle.
16. comprising by the fixed structure between the outer baffle in described, motor according to claim 15, described brushgear be fixed in fiber in the described groove.
17. motor according to claim 15, described fixed structure has inner surface, and described discharging tube comprises the drain hole that is arranged in described outer baffle, and described drain hole exposes the part of the described inner surface of described fixed structure.
18. motor according to claim 17 comprises that described chamber comprises the outer wall that surrounds described main shaft from the outside chamber of described outer baffle, described outer wall has the discharging tube opening that runs through it.
19. motor according to claim 18 is included in the seal that is positioned in the described chamber on the described main shaft.
20. motor according to claim 19, described outer wall and described outer baffle are in relative spacing relation, and in described seal and described outer baffle and the described outer wall at least one is in slipper seal and concerns.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70902105P | 2005-08-17 | 2005-08-17 | |
| US60/709,021 | 2005-08-17 | ||
| US11/455,374 | 2006-06-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1917304A true CN1917304A (en) | 2007-02-21 |
| CN100431226C CN100431226C (en) | 2008-11-05 |
Family
ID=37738222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101083100A Active CN100431226C (en) | 2005-08-17 | 2006-08-01 | Shaft current control brush assembly with drainage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100431226C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282058A (en) * | 2013-03-14 | 2018-07-13 | 雷勃美国公司 | Motor and earthing or grounding means for motor |
| CN112963953A (en) * | 2021-03-23 | 2021-06-15 | 杭州职业技术学院 | Air conditioner installation and debugging simulation regulator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8816196B2 (en) | 2012-10-04 | 2014-08-26 | Itt Manufacturing Enterprises Llc | Pressure balanced connector termination |
| US8816197B2 (en) | 2012-10-04 | 2014-08-26 | Itt Manufacturing Enterprises Llc | Pressure balanced connector termination |
| US9853394B2 (en) | 2014-05-02 | 2017-12-26 | Itt Manufacturing Enterprises, Llc | Pressure-blocking feedthru with pressure-balanced cable terminations |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5981254U (en) * | 1982-11-24 | 1984-06-01 | 三菱電機株式会社 | Grounding device for preventing galvanic corrosion of rotating electrical machine bearings |
| US4801270A (en) * | 1987-10-05 | 1989-01-31 | Xerox Corporation | Shaft mounting and electrical grounding device |
| JP3424797B2 (en) * | 1997-08-12 | 2003-07-07 | セイコーインスツルメンツ株式会社 | Spindle motor and rotating device using the spindle motor as a driving source of the rotating body |
| US6686673B1 (en) * | 1999-05-21 | 2004-02-03 | Sumitomo Electric Industries, Ltd. | Bearing structures, spindle motor, and hard disk drive |
| US20020121821A1 (en) * | 2001-03-02 | 2002-09-05 | Ritter Allen Michael | Method and apparatus for reducing bearing current in a motor and/or generator |
| US7136271B2 (en) * | 2003-03-17 | 2006-11-14 | Illinois Tool Works Inc | Static charge neutralizing assembly for use on rollers and shafts |
| US7193836B2 (en) * | 2003-03-17 | 2007-03-20 | Illinois Tool Works Inc | Grounding brush for mitigating electrical current on motor shafts |
-
2006
- 2006-08-01 CN CNB2006101083100A patent/CN100431226C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282058A (en) * | 2013-03-14 | 2018-07-13 | 雷勃美国公司 | Motor and earthing or grounding means for motor |
| CN108282058B (en) * | 2013-03-14 | 2020-03-27 | 雷勃美国公司 | Electric machine and grounding device for an electric machine |
| CN112963953A (en) * | 2021-03-23 | 2021-06-15 | 杭州职业技术学院 | Air conditioner installation and debugging simulation regulator |
| CN112963953B (en) * | 2021-03-23 | 2022-03-18 | 杭州职业技术学院 | Air conditioner installation and debugging simulation regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100431226C (en) | 2008-11-05 |
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