EP1662640A1 - Kohlenstoffbürste für eine elektrische maschine - Google Patents

Kohlenstoffbürste für eine elektrische maschine Download PDF

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Publication number
EP1662640A1
EP1662640A1 EP04772954A EP04772954A EP1662640A1 EP 1662640 A1 EP1662640 A1 EP 1662640A1 EP 04772954 A EP04772954 A EP 04772954A EP 04772954 A EP04772954 A EP 04772954A EP 1662640 A1 EP1662640 A1 EP 1662640A1
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EP
European Patent Office
Prior art keywords
brush
silicone oil
water
base material
carbon brush
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Application number
EP04772954A
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English (en)
French (fr)
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EP1662640A4 (de
EP1662640B1 (de
Inventor
Takahiro c/o Totan Kako Co. Ltd. SAKODA
Takashi c/o Totan Kako Co. Ltd. MAEDA
Yoshikazu c/o Totan Kako Co. Ltd. KAGAWA
Hidenori c/o Totan Kako Co. Ltd. SHIRAKAWA
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TotanKako Co Ltd
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TotanKako Co Ltd
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Publication of EP1662640A1 publication Critical patent/EP1662640A1/de
Publication of EP1662640A4 publication Critical patent/EP1662640A4/de
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Publication of EP1662640B1 publication Critical patent/EP1662640B1/de
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    • 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
    • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
    • 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 generally to an electromechanical carbon brush and, more particularly, to an electromechanical carbon brush for use with small-sized motors.
  • Electrically-powered motors have evolved into having smaller size, larger capacity and higher output.
  • motors used for electric vacuum cleaners are required to be of smaller size and higher sucking force. Therefore, the external diameters of motor's fans are reduced, the motors are rotated at ultra-high speed (30,000 rpm or more) .
  • ultra-high speed 30,000 rpm or more
  • an important challenge is to maintain a better electrical contact by keeping a good sliding condition between an electromechanical carbon brush (hereinafter referred to as a brush) and a commutator which is a conductive rotating body.
  • resin bonded brushes which are graphite powder bonded by synthetic resins.
  • resin bonded brushes better electrical contact is ensured by the graphite powder providing better sliding performances and by the resins providing better riding conditions.
  • a current density of a brush can be made higher by increasing input power to the motor.
  • bad rectification can be generated by being increased temperature of the brush or by being increased wear of the brush due to prolonged usage.
  • the strongly desired brush has been a brush which can ensure stable rectification and which can provide higher efficiency (output relative to input) to a motor.
  • Patent Document 1 discloses a method for partially reducing specific resistance of a brush by plating a brush surface with metal, such as copper.
  • metal such as copper.
  • this method since apparent specific resistance is reduced, the temperature of the brush is prevented from rising; stable rectification is achieved; the wear of the brush is reduced; and higher motor efficiency can be obtained.
  • Patent Document 2 discloses a method for improving wear characteristics of a brush by impregnating pores of the brush with silicone oil. In this method, by improving sliding performance between the brush and the commutator, the temperature of the brush is prevented from rising and the wear of the brush is reduced.
  • the present invention was conceived in view of these situations and an object thereof is to provide an electromechanical carbon brush which ensures more stable rectification and which can achieve higher efficiency for the motor, a longer life, a reduced temperature, suppressed sliding noises and reduced wear of the commutator.
  • an electromechanical carbon brush of the present invention is an electromechanical carbon brush applied against a conductive rotating body; and comprises a brush base material that is a material made of an aggregate including carbon as at least one (1) ingredient and a binder, wherein the electromechanical carbon brush contains a water-soluble lubricant, and wherein the content of the water-soluble lubricant is 0.2 to 10 % by weight relative to the brush base material.
  • the above purpose is achieved by providing an electromechanical carbon brush to which higher efficiency relative to a motor, a longer life, a reduced temperature, suppression of sliding noises and reduced wear of the commutator can be applied.
  • void parts called "pores" exist, as used herein, impregnation means to make the water-soluble lubricant exist in the pores in the material.
  • pores Sizes and capacities of the existing pores are different depending on differences between types, production methods and production conditions of the brush.
  • the pores exist all over the brush and include open pores continued from the surface of the brush to the inside thereof and closed pores isolated within the brush.
  • the term means the open pores.
  • the water-soluble lubricant is aqueous solution
  • the pores of the brush can be impregnated with the water-soluble lubricant remaining a size of a molecular level.
  • the water-soluble lubricant has surface active effects, reduces surface tension and facilitates the impregnation through the inside of microscopic pores by the capillary phenomenon. Therefore, the water-soluble lubricant can be impregnated in the microscopic pores of the brush and is impregnated not only in a surface portion of the brush, but also toward the inner part.
  • the water-soluble lubricant uniformly acts upon an entire sliding surface of the rotating body for a long time period, reduces mechanical resistance on the sliding surface and achieves a better sliding performance for attempting to achieve improvement of the motor efficiency, a longer life, a reduced temperature, suppression of sliding noises and reduced wear of the commutator. If the content of the water-soluble lubricant relative to the brush is less than 0.2 % by weight, advantages of the water-soluble lubricant is not generated, and if the content is 10 % by weight or more, the motor efficiency is decreased. In the case that the content of the water-soluble lubricant relative to the brush is 0.2 to 3 % by weight, since equivalent advantages can be obtained when the content is reduced, this case is economical and more preferred.
  • the water-soluble lubricant is a material soluble in water with the lubricating ability
  • the water-soluble lubricants preferred for applying to the electromechanical carbon brush of the present invention are polyethylene glycol and derivatives thereof, polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble silicone oil or mixtures thereof.
  • the derivatives of polyethylene glycol include polyethylene glycol ester, polyethylene glycol ether and the like.
  • the water-soluble silicone oil has better stability at high temperature and is more preferred.
  • the material impregnated in the electromechanical carbon brush may be fluorine denatured silicone oil, instead of the water-soluble lubricant.
  • the content of fluorine denatured silicone oil is preferred to be 0.2 to 3 % by weight relative to the brush base material.
  • the above purpose is achieved by providing an electromechanical carbon brush to which higher efficiency relative to a motor, a longer life, a reduced temperature, suppression of sliding noises and reduced wear of the commutator can be applied.
  • the fluorine denatured silicone oil Since the fluorine denatured silicone oil has small surface tension to the brush surface and easily permeates through the inside of microscopic pores by the capillary phenomenon, the fluorine denatured silicone oil can be contained in the brush by impregnation. Therefore, the fluorine denatured silicone oil can be impregnated in microscopic pores of the brush and is impregnated not only in surface pores of the brush, but also through the inner pores uniformly.
  • the fluorine denatured silicone oil uniformly acts upon an entire sliding surface of the rotating body for a long time period, reduces mechanical resistance on the sliding surface and achieves a better sliding performance for attempting to achieve improvement of the efficiency relative to the motor. If the content of the fluorine denatured silicone oil relative to the brush is less than 0.2 % by weight, advantages of the fluorine denatured silicone oil is not generated, and if the content is more than 3 % by weight, the motor efficiency is decreased.
  • the material impregnated in the electromechanical carbon brush may have composition containing water-soluble lubricant and a metallic compound, instead of the above material.
  • the content of the water-soluble lubricant is 0.2 to 10 % by weight relative to the brush base material and the content of the metallic compound is preferred to be 0.05 to 10 % by weight relative to the brush base material, and since equivalent advantages can be obtained when the content is reduced in the case of 0.1 to 4 % by weight, this case is economical and more preferred.
  • the water-soluble lubricant and the metallic compound are uniformly impregnated on the surface of the brush and within the microscopic pores to further reduce the wear of the brush and the commutator, to reduce the temperature and the sliding noises and to further improve the efficiency of the motor.
  • the binder is preferred to consist of a synthetic resin.
  • the above purpose is achieved by uniformly impregnating such a brush with the water-soluble lubricant, the fluorine denatured silicone oil, and the water-soluble lubricant and the metallic compound.
  • the binder may be carbonization product of the synthetic resin or carbonization product of a pitch.
  • the synthetic resins include epoxy resins, phenol resins, polyester resins, vinylester resins, furan resins, polyamide resins, polyimide resins and mixtures thereof.
  • the pitches include coal pitches, petroleum pitches and mixtures thereof.
  • the electromechanical carbon brush of the present invention can utilize a brush with good-conductive metal coating formed on at least one portion of the surface of the carbon brush except the surface contacting with the conductive rotating body of the electromechanical carbon brush.
  • Fig. 1 shows a schematic configuration of a motor using a brush according to an embodiment of the present invention.
  • the brush 1 slides on a portion where a rotating body 2, i.e. a commutator, of the motor contacts with a under surface 1a of the brush 1.
  • a base material of the brush 1 is a material made of an aggregate including carbon as at least one (1) ingredient and a binder.
  • the base material has pores as stated above and, in this embodiment, is impregnated with water-soluble lubricant, fluorine denatured silicone oil or both of the water-soluble lubricant and a metallic compound in the pores of the brush base material.
  • the brush base material may have pores with a small pore radius which has less than 1 ⁇ m of an average pore radius obtained by the mercury porosimetry.
  • the brush can be a carbon graphite brush called CG (Carbon Graphite) type, an electric graphite brush called EG (Electric Graphite) type, a resin bonded brush which is a synthetic resin with a non-carbonized binder, a metal type brush using metal powder such as copper powder, iron powder, silver powder or the like as a portion of the aggregate, and the like, and especially, the resin bonded brush is preferred.
  • CG Carbon Graphite
  • EG Electric graphite brush
  • resin bonded brush which is a synthetic resin with a non-carbonized binder
  • metal type brush using metal powder such as copper powder, iron powder, silver powder or the like as a portion of the aggregate, and the like, and especially, the resin bonded brush is preferred.
  • a production method of the resin bonded brush base material is described as follows.
  • the aggregate and the binder are mixed and kneaded in approximate compounding ratio of a 10 to 40 binder weight portion to a 100 aggregate weight portion.
  • artificial graphite natural graphite, exfoliated graphite and the like can be used.
  • especially preferred composition is the artificial graphite with less development of crystallization of the graphite or a composition with the natural graphite and the artificial graphite compounded.
  • thermosetting synthetic resins or thermoplastic synthetic resins are used as the binder, and either or mixture of thermosetting synthetic resins or thermoplastic synthetic resins may be used.
  • thermosetting synthetic resins or thermoplastic synthetic resins include epoxy resins, phenol resins, polyester resins, vinylester resins, furan resins, polyamide resins, polyimide resins.
  • organic solvents such as alcohols, acetone or the like may be added in an appropriate amount if necessary.
  • a portion of the aggregate may be added with addition agents such as solid lubricants or coating regulators, for example, if necessary.
  • solid lubricants such as molybdenum disulfide and tungsten disulfide or coating regulators such as alumina, silica or silicon carbide may be added.
  • the mixed and kneaded block is broken up and adjusted to powder for forming.
  • the powder is formed into the shape of the brush base material.
  • the formed material is heat-treated under the curing temperature of resins (generally, 100 to 300 °C) to cure the resins.
  • good-conductive metal coating may be formed on whole are or one portion of the side surface 1b and the upper surface 1a of the brush 1, except the under surface 1a.
  • Materials of this coating can include nickel, copper and silver. Thickness of this coating is about 3 to 10 ⁇ m, however, the present invention is not limited to this.
  • This metal coating can be performed by known methods such as electrolytic plating or electroless plating.
  • employable methods include a method for mixing the brush with the aggregate and the binder in the middle of manufacturing or a method for impregnating the brash base material manufactured in advance with the water-soluble lubricant, the fluorine denatured silicone oil or both of the water-soluble lubricant and the metallic compound.
  • Fig. 2 shows a constitutional formula of the water-soluble silicone oil.
  • the silicone oil In this water-soluble silicone oil, one of methyl groups coupled to a principal chain consisting of SiO is replaced by a functional group which is an alkyl group and polyalkylene oxide coupled to each other.
  • the average molecular weight of the silicone oil is varied by values of x and y (natural numbers) of Fig. 2 and the kinetic viscosity is also varied correspondingly.
  • the silicone oil is preferred to have 10 to 20000 mm 2 /s of the kinetic viscosity (20 °C). It is more preferred to use the water-soluble silicone oil having 10 to 1000 mm 2 /s of the kinetic viscosity.
  • an aqueous solution of the water-soluble silicone oil shown in Fig. 2 (silicone oil aqueous solution) is prepared. Since the water-soluble silicone oil and water is easily mixed, the silicone oil aqueous solution can be prepared by simple operation such as stirring with a stirrer by hand. An amount of the water-soluble silicone oil in the silicone oil aqueous solution is determined accordingly to an intended impregnation rate, an impregnating condition, a type of the selected base material and the like.
  • the prepared silicone oil aqueous solution permeates through the inside of the microscopic pores by the capillary phenomenon and impregnates the pores of the brush base material uniformly. Therefore, the impregnation can be performed by simply dipping the brush base material into the silicone oil aqueous solution.
  • vacuum degassing or pressurize operation known as common impregnation methods may be used at the same time.
  • the temperature of the silicone oil aqueous solution can be room temperature on the order of 20 to 30 °C. If necessary, the impregnation may be performed at higher temperature such as 60 to 80 °C.
  • the impregnation time is determined accordingly to conditions such as a viscosity of the silicone oil aqueous solution, temperature and the brush base material and, for example, is on the order of 10 to 60 minutes.
  • the brush After impregnating the brush for a given length of time, the brush is taken out and dried under temperature of 100 °C or more to remove water from the silicone oil aqueous solution impregnated in the brush.
  • the weight of the water-soluble silicone oil remaining in the brush base material is the impregnated weight. In this embodiment, the weight of the impregnated water-soluble silicone oil will be 0.2 to 10 % by weight relative to the brush base material.
  • a lead wire 3 or the like is accordingly attached to the brush impregnated with the water-soluble silicone oil in this way.
  • Fig. 3 shows a constitutional formula of the fluorine denatured silicone oil.
  • the silicone oil is preferred to have 10 to 20000 mm 2 /s of the kinetic viscosity (20 °C). It is more preferred to use the fluorine denatured silicone oil having 10 to 1000 mm 2 /s of the kinetic viscosity.
  • the fluorine denatured silicone oil has small surface tension to the brush surface, permeates through the inside of microscopic pores by the capillary phenomenon and impregnates the pores of the brush base material uniformly. Therefore, the impregnation can be performed by simply dipping the brush base material into the fluorine denatured silicone oil. However, vacuum degassing or pressurize operation known as common impregnation methods may be used at the same time.
  • the temperature of the fluorine denatured silicone oil can be room temperature on the order of 20 to 30 °C. If necessary, the impregnation may be performed at higher temperature such as 60 to 80 °C.
  • the impregnation time is determined accordingly to conditions such as a viscosity of the fluorine denatured silicone oil, temperature and the brush base material and, for example, is on the order of 10 to 60 minutes.
  • the brush After impregnating the brush for a given length of time, the brush is taken out to remove the fluorine denatured silicone oil adhering to the brush surface by wiping away with a soft cloth, for example.
  • the weight of the fluorine denatured silicone oil remaining in the brush base material is the impregnated weight.
  • the weight of the fluorine denatured silicone oil will be 0.2 to 3 % by weight relative to the brush base material.
  • a lead wire 3 or the like is accordingly attached to the brush impregnated with the fluorine denatured silicone oil in this way.
  • the metallic compound is a metallic compound soluble to water or organic solvents and preferably is a chelate compound.
  • Metal species of the metallic compound is groups 3 to 14 and period 3 to 5 on the periodic table of the elements and preferably are Al, Ti, Fe, Ni, Cu, Zn, Ag and Sn, and more preferably are Fe, Cu, Zn and Ag.
  • the metallic compound used in this embodiment may be electrovalent or covalent bonded compounds and includes inorganic salts such as sulfates, nitrates and hydrochlorides of the metallic species, organic salts such as acetates, oxalates, benzoates and benzenesulfonates of the metallic species, and metallic complex compounds and chelate compounds whose central atoms are the metallic species, however, the present invention is not specifically limited to these and can utilize commercially available metallic compounds.
  • ligands of complex compounds or chelate compounds are amine compounds such as ethylene diamine (en), diethylene triamine (dien), triethylene tetramine (trien), ethylene diamine tetra-acetic acid (edta), bipyridine (bpy) and terpyridine (terpy), ketonic compounds such as acetylacetone (acac), oxime compounds such as dimethylglyoxime, and the like.
  • amine compounds such as ethylene diamine (en), diethylene triamine (dien), triethylene tetramine (trien), ethylene diamine tetra-acetic acid (edta), bipyridine (bpy) and terpyridine (terpy), ketonic compounds such as acetylacetone (acac), oxime compounds such as dimethylglyoxime, and the like.
  • the silicone oil is preferred to have 10 to 20000 mm 2 /s of the kinetic viscosity (20 °C). It is more preferred to use the mixture of the water-soluble silicone oil and the metallic compound having 10 to 1000 mm 2 /s of the kinetic viscosity.
  • the mixture of the water-soluble lubricant and the metallic compound also has small surface tension, permeates through the inside of microscopic pores by the capillary phenomenon and impregnates the pores of the brush base material uniformly. Therefore, the impregnation can be performed by simply dipping the brush base material into the mixture of the water-soluble silicone oil and the metallic compound. However, vacuum degassing or pressurize operation known as common impregnation methods may be used at the same time.
  • the temperature of the mixture of the water-soluble lubricant and the metallic compound can be room temperature on the order of 20 to 30 °C
  • the impregnation is preferred to be performed at higher temperature such as 40 to 60 °C.
  • the impregnation time is determined accordingly to conditions such as a viscosity of the mixture of the water-soluble lubricant and the metallic compound, temperature and the brush base material and, for example, is on the order of 10 to 60 minutes.
  • the brush After impregnating the brush for a given length of time, the brush is dried at 100 °C. The weight of the mixture of the water-soluble lubricant and the metallic compound remaining in the brush base material is the impregnated weight.
  • the content of the water-soluble lubricant will be 0.2 to 10 % by weight relative to the brush base material, and the content of the metallic compound will be 0.05 to 10 % by weight relative to the brush base material.
  • this composition a synergic effect is generated due to using two (2) materials which are the water-soluble lubricant oil and the metallic compound as the impregnated materials, and it is believed that this composition remarkably achieves improvement of the efficiency relative to the motor, a longer life, a reduced temperature, suppression of sliding noises and reduced wear of the commutator.
  • a resin bonded brush base material used in the examples was produced as follows.
  • a 30 weight portion of an epoxy resin was combined with a 100 weight portion of artificial graphite powder (100 ⁇ m average grain diameter, 5 % or less by weight of ash content) and was mixed and kneaded at normal temperature for a certain length of time (30 to 120 minutes) such that the resin and the artificial graphite powder is mixed uniformly.
  • This mixed and kneaded material was broken up into 40 Mesh or less to produce forming powder for forming the brush.
  • the forming powder was formed into the shape of the brush (dimensions: 5.5 x 6 x 25 mm) using a metal mold and then heat-treated at 150 °C using a commercially available drier to cure the resin.
  • a powder density was 1.45 g/cm 3 and a resistivity was 700 ⁇ m.
  • an accumulative pore capacity is 212 mm 3 /g and an average pore radius was 0.76 ⁇ m.
  • the porosity was obtained by the mercury porosimetry (using the mercury porosimetry Model MAPO 120 and PO 2000, FISONS Instrument co.).
  • water-soluble silicone oil having the chemical structure shown in Fig. 2 was impregnated in pores of a resin bonded brush base material produced as above.
  • a kinetic viscosity was 100 mm 2 /s (20°C) .
  • the water-soluble silicone oil was dissolved in a predetermined amount of water to form silicone oil aqueous solution, and the brush base material was dipped into the aqueous solution for a predetermined length of time.
  • the brush base material was taken out of the silicone oil aqueous solution, and the brush impregnated with the silicone oil aqueous solution was put into a drier kept at 120 °C to remove only water impregnated along with the silicone oil by drying.
  • the motor efficiency ( ⁇ ) is shown in table 1 as the efficiency of the motor for the case of using a brush which is not impregnated with the water-soluble silicone oil and the case of using the four (4) types of brushes impregnated with the water-soluble silicone oil.
  • Table 1 Impregnation Rate of Water-Soluble Silicone Oil (% by weight) Motor Efficiency ⁇ (%) 0 40.2 0.2 40.3 1.2 40.4 2.7 40.3 4.0 39.8
  • the motor efficiency is 40. 4%, which is 0.2 % higher than the motor efficiency of the brush without impregnation of the water-soluble silicone oil (non-impregnation brush) which is 40.2 %.
  • the motor efficiency is 40.3 %, which is 0.1 % higher than the motor efficiency of the non-impregnation brush.
  • the rate of impregnation is 4.0 % by weight, the motor efficiency is decreased as a result.
  • 0.1 to 0.2 % improvements of the motor efficiency is determined as a remarkable advantage in the field of small motors used with electric vacuum cleaners and the like. Therefore, these improvements are of great significance and are evaluated as improvements with a high utility value. Especially, in the situation that the input power is regulated by specifications and the like of motors, considering that the output power can not be increased by increasing the input power, it is inevitable that such a brush with higher motor efficiency is required.
  • the brush base material with the copper coating was impregnated with the same water-soluble silicone oil using the same method as above (of this example) .
  • the rate of impregnation of the water-soluble silicone oil was lowered by on the order of 20 percent in comparison to the brush without the copper coating.
  • the rate of impregnation equivalent to the case of the brush without the copper coating could be obtained by methods such as elongating the time period of the impregnation or changing the temperature of the impregnation.
  • the brush base material produced in example 1 was impregnated with the fluorine denatured silicone oil having the chemical structure shown in Fig. 3.
  • a kinetic viscosity was 100 mm 2 /s.
  • the impregnation of the fluorine denatured silicone oil was performed by dipping the brush base material into the fluorine denatured silicone oil for a predetermined length of time at room temperature of 25 °C. Then, the brush was taken out to remove the fluorine denatured silicone oil adhering to the brush surface by wiping away with a soft cloth.
  • the brushes with the same rates of impregnation as example 1 was obtained and, in other words, (four (4) types of) brushes impregnated with the fluorine denatured silicone oil were obtained and respective rates of impregnation were 0.2, 1.2, 2.7 and 4.0 % by weights.
  • the rates of impregnation were obtained by the method same as the case of example 1.
  • the motor efficiency ( ⁇ ) is shown in table 2 for the case of using a brush which is not impregnated with the fluorine denatured silicone oil and the case of using the four (4) types of brushes impregnated with the fluorine denatured silicone oil.
  • Table 2 Impregnation Rate of fluorine denatured Silicone Oil (% by weight) Motor Efficiency ⁇ (%) 0 40.2 0.2 40.4 1.2 40.7 2.7 40.5 4.0 39.7
  • the brush base material produced in example 1 was impregnated with a mixture of the water-soluble silicone oil having the chemical structure shown in Fig. 2 and a metal complex compound Cu(edta).
  • a kinetic viscosity was 100 mm 2 /s.
  • the impregnation of the water-soluble silicone oil and the metallic compound was performed by dipping the brush base material into the mixture for 15minutes at liquid temperature of 50 °C. Then, the brush base material was taken out of the mixture, and the brush was put into a drier kept at 100 °C to remove water impregnated along with the water-soluble silicone oil and the metallic compound.
  • the respective obtained brushes had the rates of impregnation of the water-soluble silicone oil and the metallic compound shown in table 3.
  • the rates of impregnation were obtained by the methods same as the case of example 1.
  • the motor efficiencies are 41. 4 to 41. 9 %, which is 0.4 to 0.9 % higher than the motor efficiency of the brush without impregnation of the water-soluble silicone oil and the metallic compound (non-impregnation brush) which is 41.0 %, and the motor efficiencies show significant advantages.
  • the sample numbers (2) to (4) and (6) to (17) have values ranged from 3.8 to 7 (mm/100h), which are significantly reduced in comparison to that of the non-impregnation brush which is 10 (mm/100h). Further, the temperatures are suppressed at 100 °C or less. Further, in the sample numbers (2) to (4) and (6) to (17), the sliding noises are lowered in comparison to that of the non-impregnation brush which is 110 dB.
  • sample numbers (2) to (4) and (6) to (17) have values ranged from 0.04 to 0.08 (mm/100h), which are significantly reduced in comparison to that of the non-impregnation brush which is 0.12 (mm/100h).
  • the present invention can be utilized in these motors. Moreover, the present invention achieves a longer brush life, can reduce sliding noises, is beneficial from an economical standpoint, can make the brush short and can contribute to miniaturization of the motor.

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EP04772954.6A 2003-09-04 2004-09-06 Kohlenstoffbürste für eine elektrische maschine Active EP1662640B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003312561 2003-09-04
PCT/JP2004/013272 WO2005025035A1 (ja) 2003-09-04 2004-09-06 電気機械用カーボンブラシ

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EP1662640A1 true EP1662640A1 (de) 2006-05-31
EP1662640A4 EP1662640A4 (de) 2006-12-27
EP1662640B1 EP1662640B1 (de) 2016-08-24

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KR (1) KR101011999B1 (de)
CN (1) CN100388600C (de)
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US20160240989A1 (en) * 2013-10-02 2016-08-18 Toyo Tanso Co., Ltd. Metal-carbonaceous brush and method of manufacturing the same
DE102015205735A1 (de) * 2015-03-30 2016-10-06 Schunk Hoffmann Carbon Technology Ag Verwendung eines Kohlenstoffverbundmaterials zur Herstellung von elektrischen Kontaktkörpern für eine Kraftstoffpumpe sowie Kontaktkörper

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JP5825705B2 (ja) * 2010-03-26 2015-12-02 東洋炭素株式会社 カーボンブラシ
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CN105470778B (zh) * 2014-09-03 2018-07-13 苏州东南碳制品有限公司 一种清洗机电机用电刷及其制备方法
CN106549283B (zh) * 2016-10-28 2019-03-15 湖南大学 一种摩擦膜具有自我修复功能的树脂型电碳材料及其制备方法
CN116505341B (zh) * 2023-05-10 2023-11-28 湖北东南佳新材料有限公司 一种耐磨碳刷材料及其制备方法

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WO2014207047A1 (de) * 2013-06-25 2014-12-31 Pantrac Gmbh Vorrichtung zur ableitung von erdungsströmen, insbesondere in windkraftanlagen
US10109969B2 (en) 2013-06-25 2018-10-23 Pantrac Gmbh Device discharging ground currents, particularly in wind turbines
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EP3054570A4 (de) * 2013-10-02 2017-06-07 Toyo Tanso Co., Ltd. Metall-kohlenstoffhaltige bürste und verfahren zur herstellung davon
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WO2005025035A1 (ja) 2005-03-17
KR20060113346A (ko) 2006-11-02
CN100388600C (zh) 2008-05-14
CN1701487A (zh) 2005-11-23
EP1662640A4 (de) 2006-12-27
KR101011999B1 (ko) 2011-01-31
EP1662640B1 (de) 2016-08-24

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