感应起电机能演示放电现象或作静电源用，效果明显，可有效突破教学难点，但受空气的温度和湿度影响很大。在潮湿多雨的春季尤难起电，有时上课前调试好，上课演示时就不起电了。按说明书进行检查，电刷、集电梳、起电盘位置无误且较清洁。我在实践中找到了一个省时省力的应急 The induction motor can demonstrate the discharge phenomenon or use as the static power source. The effect is obvious. It can effectively break through the teaching difficulties, but it is greatly affected by the temperature and humidity of the air. In the wet and rainy spring, it is difficult to electrify, and sometimes it is easy to debug before class. When the class is presented, it will not be electrified. According to the instructions for inspection, the brush, collector comb, and the position of the electrifying disk are correct and relatively clean. I found a time-saving and emergency response in practice