EP1979995A1 - Balai pour moteur electrique - Google Patents
Balai pour moteur electriqueInfo
- Publication number
- EP1979995A1 EP1979995A1 EP06829570A EP06829570A EP1979995A1 EP 1979995 A1 EP1979995 A1 EP 1979995A1 EP 06829570 A EP06829570 A EP 06829570A EP 06829570 A EP06829570 A EP 06829570A EP 1979995 A1 EP1979995 A1 EP 1979995A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- collector
- brush
- contact
- blades
- life
- 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
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
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
-
- 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
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/26—Solid sliding contacts, e.g. carbon brush
-
- 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
-
- 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
- H01R43/12—Manufacture of brushes
Definitions
- the present invention relates to brushes for an electric motor. These include electric motors used in ventilation systems for a motor vehicle.
- Electric motors usually used for ventilation systems (air conditioning) of motor vehicles conventionally include a stator and a rotor.
- the collector of this rotor is provided with electrical contact blades (generally made of machined copper) adapted to ensure electrical contact with brushes made of graphite (also called coals). These brooms are integral with the stator.
- electrical contact blades generally made of machined copper
- brushes made of graphite (also called coals).
- These brooms are integral with the stator.
- the brushes In known manner to ensure good electrical contact between the collector and the brushes must be applied to the collector with sufficient pressure. When the contact is not sufficient, the brushes can jump, thereby intermittently breaking the electrical contact. This usually causes sparks. By cons if the contact is too important mechanical losses increase as well as temperature and wear.
- the brushes are set up, conventionally, in brush holders provided with elastic means adapted to maintain electrical contact between the brushes and the collector.
- the collector has a cylindrical shape of revolution and carries on its outer periphery a plurality of conductive blades.
- the brushes are, in turn, arranged radially around the collector and have a contact surface with the collector blades. In particular, there are brooms for two collector blades or three blades.
- This configuration has the disadvantage of being noisy, especially at the beginning of life. This is mainly related to the switching uncertainty (point of random contact between the blade and the blade).
- a patina consisting of a deposit containing essentially metal (and its oxides) of carbon and water is formed on the surface of the collector. This patina tends to make the operation of the engine less noisy. However this patina is formed after a few hours of operation of the engine.
- Such engines are thus too noisy at the beginning of life which is hardly compatible with their installation in a passenger compartment of a motor vehicle.
- P number of collector blades.
- These brooms present the advantage of being less noisy at the beginning of life but have the particularity of increasing the temperature level.
- To better dissipate the heat increases the friction section with the collector, but this results in a change in the size of the brushes.
- the object of the present invention is to reduce the noise of electromagnetic and mechanical operation of the motor between the beginning of life of the engine and the regime in stabilized operation and this without changing the size of the brushes.
- the present invention relates to a brush adapted to come into contact with conductive blades arranged on an electric motor collector, said brush being characterized in that it has a means for adjusting its polar cover between the beginning of life of the motor and its stabilized operation.
- the means for adjusting the polar cover is a function of the width of the blade at its contact zone with the collector.
- variable polar cover is obtained by producing at least one zone of limited width on the periphery of a zone of contact with the collector blades, the said adapted zone being adapted to reduce the polar cover of the brush at the beginning of the motor life and to guarantee a polar cover determined in stabilized operation of the engine.
- the adjustment means comprises two arranged zones (chamfered) formed on either side of the contact zone between the brush and the collector. These areas are gradually worn out by the rotation of the collector. As a result, the contact surface between the collector and the brush gradually increases as the motor ages.
- a reduced contact surface (at the beginning of the life of the motor) creates larger currents between the collector and the brush. These currents increase the speed of growth of the patina. It is this patina that contributes to the reduction of engine noise.
- a reduced contact surface reduces the "arcing" phenomena related to so-called multiple switching (mutual inductances).
- the developed zones created on either side of the zone of contact with the collector thus advantageously make it possible to accelerate the formation of the patina, to reduce the dispersions of the electromechanical performances, to reduce the level and the vibroacoustic dispersions, to reduce the electromagnetic phenomena (such as discharges), while maintaining the thermal stresses at their usual level, without additional cost (the developed areas are made by molding) and without significant modification of the size of the brushes.
- This "in situ” running-in is, however, a simple break-in which does not require any complex operation and which simply refines the pairing between the brushes and the collector.
- FIG. 1 is a diagrammatic sectional view showing a brush according to the invention in contact with a collector
- FIG. 2 is a view similar to FIG. 1 showing in detail the geometry of the brush according to the invention
- FIG. 3 is a schematic sectional view showing a brush according to the invention at the beginning of life of the engine, the brush then bears on two collector blades,
- FIG. 4 is a schematic sectional view showing a brush according to the invention in stabilized operation of the motor, the brush then bears on three collector blades,
- FIG. 5 is a schematic perspective view of the blade according to the invention.
- FIG. 6 is a curve showing the evolution of the polar cover of a broom according to the invention as a function of the length of the blade
- FIG. 7 is a schematic view similar to FIG. 2 showing an embodiment variant with developed zones having radii of curvature
- FIGS. 8a and 8b are diagrammatic views similar to FIG. 2, showing an embodiment variant with a single developed zone.
- the blade 10 according to the invention is adapted to come into contact with a collector 11.
- the collector 11 of an electric motor (not shown) is driven in movement (arrow R - Figure 1 -) with the rotor portion of this electric motor.
- This collector is provided on its periphery with a plurality of conductive blades 12. These blades (twelve in number - in the example shown -) are better visible in FIGS. 3 and 4.
- the brushes 10 are in turn secured to the stator portion.
- the brushes are made, in known manner, graphite (with a certain percentage of copper and various additives) and are also still commonly called “coals”.
- the brushes 10 To maintain a permanent contact zone 13 between the blades 12 of the collector and the brushes 10, in order to transmit an electric current between these two elements, the brushes 10 must be applied to the collector 11 with a sufficient pressure P. When contact is not sufficient, there is a risk of sparks. On the other hand, if the contact is too great, the mechanical losses increase as well as the temperature and wear.
- the brushes 10 are set up, conventionally, in brush holders (not shown) provided with elastic means (not shown) adapted to apply the brushes against the collector (arrow P - Figure 1 -). Little by little during the operation of the motor, the brushes wear out. In the example shown, the brushes have a length L of the order of 14 mm at the start. It is considered that they are worn when they measure only 6 mm and that the braid 14 is almost in contact with the collector 11.
- the position of the average contact point between the brush and the collector remains stable throughout the operating life of the motor (that is to say even after wear of the brush).
- the electrical commutation angle and the rotational speed of the motor also remain stable throughout the life of the engine.
- the average contact point between the brush and the collector is centered relative to the face of the brush in contact with the collector.
- the electric motors have a first period of operation, called early life, during which a progressive burn-in takes place, as well as a deposit of patina on the collector. This first period lasts (in the example shown) a few hundred hours.
- the engines then have a second period (very long - several thousand hours), called stabilized operation.
- stabilized operation brush wear continues steadily, but at a lower rate, and the patina is well formed and allows sliding with optimum friction between the brushes and the collector.
- the end of life in which the wear of the brushes is such that their supply braid 14 contacts the collector.
- the brooms must then be changed.
- the blade 10 is provided with means for adjusting its polar cover between the beginning of life of the engine and its stabilized operation.
- the brush according to the invention is in the general form of a parallelepiped ( Figure 5) consisting essentially of graphite. According to the invention, two developed zones (in the case represented, these are chamfered zones) are formed on either side of the contact zone 13 with the collector (see also FIG.
- these two chamfered zones are produced by molding the graphite during the formation of the blade.
- graphite broom it is not necessary to machine the graphite broom to create them.
- Such obtaining by molding allows to achieve easily, quickly and especially without real cost over these two chamfered areas.
- the chamfered zones 15 constitute a means for adjusting the polar cover of the blade.
- the engine is early in life and the brush has the form described above and is therefore provided with two chamfered areas.
- the width I 1 (FIG. 2) of the zone in contact with the collector is less than the width I 2 of the brush.
- the broom then bears on two collector blades.
- the advantage of only two blades at the beginning of life is to accelerate the formation of patina, to reduce (see delete) the electrical switching effects related to mutual inductances and thus reduce the noise operation.
- the width (I 1 , I 2 ) of the zone in contact with the collector it is possible to make vary the polar angle of the broom. Therefore it is possible to use the advantages of a reduced polar angle at the beginning of life (accelerated patina formation therefore less vibration therefore less noise) without the long-term disadvantages of this type of angle polar. Indeed in the long term the polar angle is greater than 41, 5 ° which allows to bring the broom on three blades. In stabilized operation is then used to the maximum benefits of this configuration (less noise, good patina, less wear).
- the invention therefore consists in adjusting the polar angle of the blade differently as a function of the life of the motor. To do this, it is sufficient to vary the width of the brush (I 1 , I 2 ) throughout the operation of the engine.
- the variation of the width of the blade is progressive (this is due to the two chamfered zones 15).
- the developed area could have more than one shoulder or more than one chamfer on each side of the contact zone 13.
- the developed area may have radii of curvature and be made on either side of the contact area or on only one of these sides (see Figure 7).
- the developed zone 15 could be made on only one of the sides of the contact zone 13 and not on either side of this zone.
- Figure 6 illustrates in particular the variation of the polar angle of the blade as a function of the wear thereof, that is to say as a function of the service life of the engine.
- On the ordinate ( Figure 6) is the polar angle in degree (also called polar blanket) and the abscissa length L of the brush.
- the broom When the broom comes out of the molding, it measures substantially (in the example shown) 14 mm long (L). Its polar coverage angle is 25 °. A first "in situ" burn-in (ie a grinding of the broom to give it the exact shape of the collector with which it will be associated) will reduce the length of the broom to 13.6 mm. At this time the polar cover angle of the blade is about 30 °. At this level of completion the engine is put into operation (early life of the engine).
- Figure 6 therefore shows how the variation of the width I of the blade, makes it possible to vary the polar angle.
- the control of the polar cover of the broom according to the life of the engine allows to always be placed in optimum configurations by limiting the noise of the engine mainly during all the passage from the beginning of life of the engine until reaching steady state. This also makes it possible to choose the polar angle of the broom according to the service life of the broom by designing a broom with a width adapted to the desired polar angle.
- the operating time is extended more or less on two or three commutator blades. Note that a chamfer having a slope of 60 °, has the further advantage of being easily achievable by molding.
- the invention is not limited to the embodiment described above.
- the numerical values given for the length L, the width I, and the polar angle ⁇ are only given by way of illustrative and nonlimiting example.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0600223A FR2896095B1 (fr) | 2006-01-11 | 2006-01-11 | Balai pour moteur electrique |
| PCT/EP2006/011995 WO2007079892A1 (fr) | 2006-01-11 | 2006-12-13 | Balai pour moteur electrique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1979995A1 true EP1979995A1 (fr) | 2008-10-15 |
| EP1979995B1 EP1979995B1 (fr) | 2013-02-20 |
Family
ID=36933156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06829570A Not-in-force EP1979995B1 (fr) | 2006-01-11 | 2006-12-13 | Balai pour moteur electrique |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8040016B2 (fr) |
| EP (1) | EP1979995B1 (fr) |
| FR (1) | FR2896095B1 (fr) |
| WO (1) | WO2007079892A1 (fr) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009045265A1 (de) * | 2009-10-01 | 2011-04-07 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Gleichstrommaschine |
| DE102010040520A1 (de) * | 2010-09-09 | 2012-03-15 | Robert Bosch Gmbh | Verfahren zum Bestimmen eines Zustands eines Startermotors |
| CN102957288B (zh) * | 2011-08-10 | 2017-12-12 | 德昌电机(深圳)有限公司 | 驱动装置及其有刷电机 |
| DE102012211359A1 (de) * | 2012-06-29 | 2014-01-02 | Robert Bosch Gmbh | Gleichstrommotor, Gleichstrommotorsystem, Verfahren zur Herstellung |
| DE102013217077A1 (de) * | 2013-08-27 | 2015-03-05 | Robert Bosch Gmbh | Bürsteneinrichtung für eine elektrische Maschine und elektrische Maschine |
| CN105743289A (zh) * | 2014-12-31 | 2016-07-06 | 德昌电机(深圳)有限公司 | 电机驱动装置及其电机、电刷 |
| DE102016222924A1 (de) * | 2016-11-21 | 2018-05-24 | Seg Automotive Germany Gmbh | Kommutierungseinrichtung für eine elektrische Maschine |
| CN108233583B (zh) * | 2016-12-14 | 2021-11-30 | 德昌电机(深圳)有限公司 | 电机及其电刷 |
| JP7255976B2 (ja) | 2018-05-22 | 2023-04-11 | ミネベアミツミ株式会社 | モータ |
| US12266987B1 (en) | 2022-04-20 | 2025-04-01 | Larry A. Burchfield | Rotating brushes for electric motors |
| CN114824990A (zh) * | 2022-04-26 | 2022-07-29 | 安徽衡盛五金机电制品有限公司 | 一种耐磨碳刷的快速成型工艺方法 |
| FR3142617B1 (fr) * | 2022-11-28 | 2025-10-03 | Valeo Systemes Dessuyage | Balai pour moteur électrique et moteur électrique associé |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB813649A (en) * | 1955-10-07 | 1959-05-21 | Westinghouse Electric Int Co | Improvements in or relating to electrical contact brushes |
| US5485049A (en) * | 1994-05-25 | 1996-01-16 | United Technologies Motor Systems, Inc. | Multi-speed motor |
| DE19533031A1 (de) * | 1995-01-03 | 1996-07-04 | Teves Gmbh Alfred | Kohlebürste |
| US6528923B2 (en) * | 2000-12-07 | 2003-03-04 | Denso Corporation | Rotary electric machine with stacked brush |
| JP4159263B2 (ja) * | 2001-04-19 | 2008-10-01 | 株式会社ミツバ | モータ |
| JP3641238B2 (ja) * | 2001-12-26 | 2005-04-20 | アスモ株式会社 | ブラシ保持装置、回転電機の組み付け方法 |
| US6750585B2 (en) * | 2002-10-25 | 2004-06-15 | Korea Delphi Automotive Systems Corporation | Brush assembly of alternator for vehicle having improved brush and wiring to prevent lead wire interference during brush extraction and retraction |
| DE10347764A1 (de) * | 2003-10-14 | 2005-05-12 | Bsh Bosch Siemens Hausgeraete | Isolierte Kohlebürstenführung |
| DE10355813A1 (de) * | 2003-11-28 | 2005-06-23 | Robert Bosch Gmbh | Bürste für eine elektrische Maschine |
-
2006
- 2006-01-11 FR FR0600223A patent/FR2896095B1/fr not_active Expired - Fee Related
- 2006-12-13 EP EP06829570A patent/EP1979995B1/fr not_active Not-in-force
- 2006-12-13 US US12/087,693 patent/US8040016B2/en not_active Expired - Fee Related
- 2006-12-13 WO PCT/EP2006/011995 patent/WO2007079892A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007079892A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20090152978A1 (en) | 2009-06-18 |
| US8040016B2 (en) | 2011-10-18 |
| WO2007079892A1 (fr) | 2007-07-19 |
| FR2896095B1 (fr) | 2008-06-13 |
| EP1979995B1 (fr) | 2013-02-20 |
| FR2896095A1 (fr) | 2007-07-13 |
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