(一) 问题的提出牵引电动机转子线圈焊接不良,一直是204和410电机的一大惯性质量问题。我段在运用中,由于焊接不良出现线头过热、氧化、开焊、甩锡等故障较为严重,有的甚至出现匝间短路、接地、崩无纬带,给修理造成很大困难。对转子线圈焊接不良者,我段过去均采用锡焊。可是锡焊只能焊在升高片表面一层,锡液根本没有吸入升高片背面,因此电机装车后 (A) the issue of traction traction motor rotor coil poor welding, 204 and 410 has been a large motor inertial quality problems. I segment in use, due to poor welding head thread overheating, oxidation, welding, rejection of tin and other more serious failures, and some even turn to turn short circuit, grounding, collapsing no latitude, to repair great difficulties. Poor welding of the rotor coil, I have used in the past soldering tin. However, soldering can only be welded on the surface of the sheet, the tin solution does not inhale the back of the sheet, so the motor is loaded