一台新购置的万象牌农用汽车,在磨合后期起动时,将点火开关转至起动位置,起动机开关处发出“哒哒哒”的频繁响声,而发动机飞轮未被带转。根据故障的现象分析,接通电源后,磁力开关起动线圈产生的磁力大于回位弹簧的弹力,使触点闭合,发出哒的声音。 为什么触点闭合后能自动分离,而分离后又被吸合发出“哒哒哒”的响声呢?判断是:其 A newly purchased Vientiane brand agricultural vehicle turned on the ignition switch at the start-up after the break-in period started, and the “da da da” sound was heard at the starter switch, while the engine flywheel was not taken over. According to the analysis of the phenomenon of failure, after the power is turned on, the magnetic force generated by the magnetic switch starting coil is greater than the spring force of the return spring, so that the contact is closed and a loud sound is emitted. Why the contact closed automatically separated, and after separation was sucked together issued a “da da da” sound? Judgment is: its