论文部分内容阅读
目前世界先进国家的直流电机,特别是直流牵引电机的电枢绕组导体与换向器升高片连接处的焊接,几乎全都采用了TIG焊即钨极氩弧焊Tungsten Inert Gas Arc Wel-ding)。锡焊和TIG焊在高温下的强度比较曲线,如图1所示。由图表明,锡焊可满足B级以下的耐热;B级以上的耐热温度,锡焊是无法满足要求的。锡焊的B级绝缘电机,在使用中往往因过载温升高,锡的机械强度降低,在转子离心力的作用下,产生甩锡开
At present, Tungsten Inert Gas Arc Weld (TIG) welding is adopted for almost all the DC motors in advanced countries in the world, especially the armature winding conductors of DC traction motors and commutator risers. . Solder and TIG welding at high temperature intensity comparison curve, shown in Figure 1. The figure shows that soldering can meet the following B-level heat; B-class heat-resistant temperature above, soldering is unable to meet the requirements. Soldering B-class insulation motor, often due to overload temperature rise, the mechanical strength of tin is reduced, under the action of the rotor centrifugal force, resulting in rejection of tin open