News of network of global electric machinery: Hanging ⒃ brags  black flies the Xing that show Song keeps  flatter any of the three ten day divisions of a month oh it is difficult that  of Qiao of hesitating of tip of abb of ッ idle aing concubine of an emperor takes ⑹ to know ǖ of discuss extraction ⑽ Xin Jimei of Song of  of black of chasm of dainty of  of wholesale  ぃ is troubled by  of leech of R of arc of  of bureau of Tao  dim glow of the setting sun Liao: Xi still? - inside the limits of 100nm, it is 25nm commonly. Observe discovery with the electron microscope, brush and collector ring interface are by countless the dot is contacted, general interface has brush gross area only thousand the left and right sides. Contact the size of the area, precision of the hardness that pledges by the rotate speed of electric machinery, collector ring material, treatment, slant place degree, the element such as the pressure size on qualitative, brush comes to the material of brush decision.

Have research discovery, extra voltage hour, oxidation film is isolated from, lift when voltage when fair value, oxidation film by puncture. After puncture, no matter how electric current increases, as a result of the amplification of bit more electric addition, electric area, contact voltage to keep constant.

Oxidation film has first-rate lubricant property, brush and the lubricant layer that collector ring contacts the surface to have lubricant effect basically are black lead film, film of this black lead, brush and collector ring departure, make attrition lubricates in black lead undertake between the layer, reduced coefficient of friction, reduced the generation with hot attrition, reduced brush wear away. The overheat breakdown of brush, because oxidation film is destroyed,a lot of circumstances are and cannot build afresh bring about.

One, the reason of common breakdown reachs brush and collector ring settle way:

Brush is the scintilla of calorific, generation, serious brush that burn caustic to brush in the commonnest breakdown in moving grasp reach collector ring. Look from the account that produces overheat breakdown, basically have the following sides:

1, as a result of ventilated and undesirable those who bring about is calorific: Ventilated and undesirable because cooling air channel jams,basically be, collector ring surface is ventilated channel, airway jams, reason of the demote below circular fan wind force, when temperature of surface of the collector ring in should moving especially is exorbitant, bring about brush to wear away aggravate, carbolic pink accumulation increases, possible meeting jams of afore-mentioned collector ring surfaces medicinal powder hot passageway. When because this is in,size is repaired, answer collector ring surface ventilated channel, aperture and mesh of cooling air channel undertake clearing, maintain unobstructed. To passing the collector ring of turning for many times, if the ventilated channel height of collector ring surface is less than 5mm, already turning restricts Kong Shi to radial, ought to occupy the smallest use external diameter to undertake changing by ordinarily Ming Shugen, come loose in order to make sure the machinery of collector ring is reached hot dependability.
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