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三相交流电是电学教学中一个难点,加强演示实验非常必要,物理课本及其它有关书籍,多是介绍在三相发电机的每组线圈中串联一只电流表,根据三个电流表的指针随转子的转动而摆动,从而观察三相交流电的周期、振幅和相位差。可是在同一时刻里观察三个电流表的摆动情况是很困难的;此外电流表指针的惯性及固有频率的影响,这个演示实验很难收到预期的效果,笔者制作了一个《三相交流电示教板》,结构简单,易于制作,配合广东省海南教学仪器厂或其他厂家出品的手摇三相交流发电机使用,直观性较强,在演示
Three-phase alternating current is a difficult point in the teaching of electricity. It is very necessary to strengthen the demonstration experiment. Physics textbooks and other related books mostly introduce a current meter in series for each set of three-phase generators. According to the three ammeters, the pointers follow the rotor. Rotate and swing to observe the period, amplitude and phase difference of the three-phase alternating current. However, it is very difficult to observe the swing of the three ammeters at the same time; in addition to the influence of the inertia of the ammeter pointer and the natural frequency, this demonstration experiment is difficult to receive the expected results. The author produced a “three-phase alternating current teaching board”. 》The structure is simple and easy to make. It is used together with hand-cranked three-phase alternator produced by Hainan Teaching Instrument Factory of Guangdong Province or other manufacturers. It is intuitive and strong.