EP0072693A2 - Electrical brushes - Google Patents
Electrical brushes Download PDFInfo
- Publication number
- EP0072693A2 EP0072693A2 EP82304314A EP82304314A EP0072693A2 EP 0072693 A2 EP0072693 A2 EP 0072693A2 EP 82304314 A EP82304314 A EP 82304314A EP 82304314 A EP82304314 A EP 82304314A EP 0072693 A2 EP0072693 A2 EP 0072693A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- brush
- sensor
- loop
- transverse hole
- bore
- 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
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
- H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear
Definitions
- This invention relates to electrical brushes having a wear sensor in the form of an electrical conductor or lead within the brush body.
- Such wear sensor leads have, of course, to be insulated from the electrically conductive brush bodies
- United Kingdom Patent Specification No. 1,158,298 in the name of Cello-Pak A/S is an example of a brush body incorporating an embedded loop of an insulated conductor extending down to the limit of permissible wear of the brush.
- difficulty is experienced in anchoring the necessary high temperature insulators which are based on materials such as polymers of fluoroethylene. These high temperature insulators have a smooth, generally inert surface that cannot be simply bonded in the brush body to anchor the sensor.
- an electrical brush has a brush wear sensor in the form of a loop of insulated electrical conductor lying in a bore in the brush leading from an upper surface thereof to a depth equivalent to the point at which brush wear is to be sensed, the sensor loop passing around a fixed part of or in the brush at the bottom of the bore to anchor the sensor loop in the brush.
- the brush body between the two bores provides the loop anchorage.
- the transverse bore may be filled with an epoxy resin cement or the like.
- a brush 1 has a pair of silastomer sleeved flexible current shunts 2 and 3 located by tamped copper powder connections in the top 4 of the brush.
- Two fine bores 5 and 6 are drilled from the brush top 4, close to the side 7, and angled towards one another to converge at a short hole 8 drilled transversely from the side 7. Hole 8 is drilled at a depth d from the brush top 4 at which it is desired to sense brush wear.
- a brush wear sensor 9 in the form of a lead or conductor insulated with TEFLON (Trade Mark) is made into a loop of which the two arms 10 and 11 are each fed into one of the bores 5 and 6 via the side hole 8.
- the sensor arms are twisted together above the brush and the free ends are connected to a terminal 12.
- This construction has the advantages of ease of assembly as the lead ends are simple to insert through the side hole 8 into the bores 5 and 6.
- the wear depth d can be set accurately, as it is a combination of the siting of hole 8 and the protrusion into the hole of the loop end 13.
- the hole 8 is filled with ARALDITE (Trade Mark) to bond the loop end 13 in the hole 8, to seal the hole and to help to retain the loop and the ends thereof formed as the brush wears past the hole 8.
- ARALDITE Trade Mark
- the sensor lead 9 is used in known manner to detect wear by current leakage.
- a single larger diameter bore leads from the brush top to a side hole at the wear depth.
- a loop of sensor lead is passed down the bore and is anchored into the brush by a plug or locking pin of brush or other conducting or non-conducting material passed and locked into the side hole and through the loop end.
- the plug or pin material must be one which would not cause damage to the surface of a commutator as it comes into rubbing contact.
Abstract
Description
- This invention relates to electrical brushes having a wear sensor in the form of an electrical conductor or lead within the brush body.
- Such wear sensor leads have, of course, to be insulated from the electrically conductive brush bodies, United Kingdom Patent Specification No. 1,158,298 in the name of Cello-Pak A/S is an example of a brush body incorporating an embedded loop of an insulated conductor extending down to the limit of permissible wear of the brush. However, in the high temperature conditions experienced by heavy duty or heavy current brushes, difficulty is experienced in anchoring the necessary high temperature insulators which are based on materials such as polymers of fluoroethylene. These high temperature insulators have a smooth, generally inert surface that cannot be simply bonded in the brush body to anchor the sensor.
- It is an object of the present invention to overcome the aforesaid difficulty of anchoring sensor leads in a brush body.
- According to the present invention an electrical brush has a brush wear sensor in the form of a loop of insulated electrical conductor lying in a bore in the brush leading from an upper surface thereof to a depth equivalent to the point at which brush wear is to be sensed, the sensor loop passing around a fixed part of or in the brush at the bottom of the bore to anchor the sensor loop in the brush.
- In a preferred embodiment of the invention, a pair of fine bores led from the brush top to meet a transverse hole in a side or face of the brush at said depth, the wear sensor conductor lying in the two bores and looping from one to the other via the transverse hole. In this embodiment the brush body between the two bores provides the loop anchorage. The transverse bore may be filled with an epoxy resin cement or the like.
- The invention is illustrated by way of example in the Drawings, wherein:-
- Fig. 1 is a side elevation of a brush in accordance with the invention, and
- Fig. 2 is a front elevation of the brush of Fig. 1.
- As shown, a brush 1 has a pair of silastomer sleeved flexible
current shunts - Two
fine bores side 7, and angled towards one another to converge at ashort hole 8 drilled transversely from theside 7.Hole 8 is drilled at a depth d from the brush top 4 at which it is desired to sense brush wear. - A
brush wear sensor 9 in the form of a lead or conductor insulated with TEFLON (Trade Mark) is made into a loop of which the twoarms bores side hole 8. The sensor arms are twisted together above the brush and the free ends are connected to aterminal 12. This construction has the advantages of ease of assembly as the lead ends are simple to insert through theside hole 8 into thebores hole 8 and the protrusion into the hole of theloop end 13. - Finally, the
hole 8 is filled with ARALDITE (Trade Mark) to bond theloop end 13 in thehole 8, to seal the hole and to help to retain the loop and the ends thereof formed as the brush wears past thehole 8. - The
sensor lead 9 is used in known manner to detect wear by current leakage. - In an alternative, unillustrated embodiment, a single larger diameter bore leads from the brush top to a side hole at the wear depth. A loop of sensor lead is passed down the bore and is anchored into the brush by a plug or locking pin of brush or other conducting or non-conducting material passed and locked into the side hole and through the loop end. The plug or pin material must be one which would not cause damage to the surface of a commutator as it comes into rubbing contact.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8124882 | 1981-08-14 | ||
GB8124882 | 1981-08-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0072693A2 true EP0072693A2 (en) | 1983-02-23 |
EP0072693A3 EP0072693A3 (en) | 1983-03-09 |
EP0072693B1 EP0072693B1 (en) | 1986-02-05 |
Family
ID=10523944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19820304314 Expired EP0072693B1 (en) | 1981-08-14 | 1982-08-16 | Electrical brushes |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0072693B1 (en) |
DE (1) | DE3268958D1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2130809A (en) * | 1982-08-30 | 1984-06-06 | Gen Electric | Brush wear indicator |
US5870026A (en) * | 1997-07-15 | 1999-02-09 | The Morgan Crucible Company Plc | Brush wear indicator |
DE19755232B4 (en) * | 1997-12-12 | 2008-12-24 | Continental Automotive Gmbh | Fuel pump |
DE10192143B4 (en) * | 2000-05-26 | 2016-09-15 | Schleifring Und Apparatebau Gmbh | Holding and contacting device for sliding contacts |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB795998A (en) * | 1955-06-29 | 1958-06-04 | Erich Mittelsten Scheid | Improvements in or relating to carbon brushes |
US3153164A (en) * | 1961-05-15 | 1964-10-13 | Kirkwood Carbon Corp | Commutator brush and connection |
GB1158298A (en) * | 1966-10-18 | 1969-07-16 | Cello Pak As | Improvements in and relating to Contact Carbon Bushes and Equipments Comprising such Brushes. |
US4316186A (en) * | 1980-02-06 | 1982-02-16 | Eltra Corporation | Brush wear detection and warning system |
-
1982
- 1982-08-16 DE DE8282304314T patent/DE3268958D1/en not_active Expired
- 1982-08-16 EP EP19820304314 patent/EP0072693B1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB795998A (en) * | 1955-06-29 | 1958-06-04 | Erich Mittelsten Scheid | Improvements in or relating to carbon brushes |
US3153164A (en) * | 1961-05-15 | 1964-10-13 | Kirkwood Carbon Corp | Commutator brush and connection |
GB1158298A (en) * | 1966-10-18 | 1969-07-16 | Cello Pak As | Improvements in and relating to Contact Carbon Bushes and Equipments Comprising such Brushes. |
US4316186A (en) * | 1980-02-06 | 1982-02-16 | Eltra Corporation | Brush wear detection and warning system |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2130809A (en) * | 1982-08-30 | 1984-06-06 | Gen Electric | Brush wear indicator |
US5870026A (en) * | 1997-07-15 | 1999-02-09 | The Morgan Crucible Company Plc | Brush wear indicator |
DE19755232B4 (en) * | 1997-12-12 | 2008-12-24 | Continental Automotive Gmbh | Fuel pump |
DE10192143B4 (en) * | 2000-05-26 | 2016-09-15 | Schleifring Und Apparatebau Gmbh | Holding and contacting device for sliding contacts |
Also Published As
Publication number | Publication date |
---|---|
EP0072693A3 (en) | 1983-03-09 |
EP0072693B1 (en) | 1986-02-05 |
DE3268958D1 (en) | 1986-03-20 |
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