问:在修理手电钻时,磨碳刷接触面的方法,一般是在整流器面上包一条细砂布,将碳刷沿轴向在砂布上慢慢磨擦,直到碳刷接触面能全部和整流器接触。但装上起动后,火花仍然较大,拆下检查碳刷接触面只磨光一点,接触面太小是何原因? 答:磨好的碳刷,运行起来,接触面却很小,象这种情况,一般是由于碳刷的尺寸较小,或“刷握”扩大了,装上碳刷后,碳刷在“刷握”内摇动,所以原接触面不能和整流器全部 Q: When repairing the hand drill, the method of grinding the brush contact surface is generally to wrap an abrasive cloth on the surface of the rectifier. The carbon brush is slowly rubbed on the abrasive cloth along the axial direction until all the contact surfaces of the brush can contact with the rectifier . However, after the start of the installation, the spark is still large, remove the check brush contact surface only polished a little, the contact surface is too small What is the reason? A: The polished carbon brush, up, the contact surface is small, like this The situation is generally due to the smaller size of the carbon brush, or “brush holder” to expand, with a carbon brush, the carbon brush in the “brush holder” shaking, so the original contact surface can not and the rectifier all