一台汽车用有刷 1 2Ｖ、 50 0Ｗ交流发电机不发电 ,有异响声。拆下交流发电机进行检查 ,发现其定、转子铁心有撞伤。经测试 ,定子绕组已搭铁短路 ,整流二极管良好 ,磁场绕组未发现搭铁 ,轴承已损坏。该交流发电机经重绕定子绕组、更换轴承并组装之后 ,在自制简易试验台上测试 , A car with a brush 1 2V, 50 0W alternator does not generate electricity, a different sound. Remove the alternator for inspection and found that the rotor core is damaged. After testing, the stator windings have been shorted, the rectifier diode is good, the field winding is not found on the ground, the bearing has been damaged. The alternator by rewinding the stator windings, replace the bearings and assembled, tested in self-made simple test bench,