一、磨損的不可預見 安全滑觸線現大多采用集電器碳刷與導電面緊壓接觸，通過摩擦滑動的方式實現連續供電的。碳刷磨損的快慢，磨損量的多少及磨損*的時刻，是與滑觸線的使用頻率、工作制度、工作環境、導電面粗糙程度及壓力大小等因素有關，是人所不能監控的。這種碳刷磨損*后不可預見的停電，一直是集電器使用中要解決的難題。
An unforeseen, wear safety sliding contact line is mostly by the collector and the conductive surface press contact, through frictional sliding mode to realize the continuous power supply. Carbon brush wear rate, wear quantity and wear the ultimate moment, is associated with the sliding contact line frequency of use, working system, working environment, the conductive surface roughness and the size of the pressure and other factors, people can monitor. The carbon brush wear unforeseen ultimate power outages after, has been a difficult problem to solve in the use set of electrical appliances.
  二、磨損*的隱患 滑觸線集電器在碳刷有效磨損范圍內供電是正常的。但碳刷磨損*后，從靜態看，彈簧彈力不足，壓力幾乎沒有，電阻變大，接觸不良。從動態看，磨損是漸進的，工作處于運動狀態，甚至是點動狀態，因而起動電流很大，加上運動時的震動，滑觸線安裝的缺陷，變形等因素使集電器碳刷與導電面似觸非觸，因此產生強烈火花，燒得集電器發黑，碳刷框變形，滑觸線導電面摩擦系數加大，影響了導電性能。
Two, wear the ultimate hidden sliding contact line collector effective wear range of power supply in the carbon brush is normal. But the ultimate carbon brush wear, from the view of static state, the elastic force of the spring pressure is insufficient, almost no, resistance becomes large, poor contact. From the view of dynamic state, wear is a gradual, work in motion, or even move state, thus starting current is large, coupled with the movement of the sliding contact line motion, defects in installation, deformation and other factors make the collector and the conductive surface touch non contact, therefore have a strong spark, burned collector blackening, a carbon brush frame deformation, sliding contact line conducting surface friction coefficient increase, affecting the conductivity.