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微风吊扇,由于具有安全、节能、方便等优点.用微风电扇完成的实验亦具有易于携带、便于操作等特点.下面介绍几则应用于教学的例子. 一、演示“磁生电”以及“电动机和发电机的关系”. 常见的微风电扇电动机,其转子在外层,由8对磁极构成;定了在内层,由线圈组成.通以交流电后,外层的转子(磁极)转动,将电能转换为机械能. 如图1所示,在微风电扇插头处并接一交流伏特表(例如万用电表的交流100伏挡).用手拨动风扇叶片带动转子(磁极)转动,由于电磁感应会在定子(线圈)中产生感生电流,于是电风扇变成了“发电机”.从而可说明: (1)磁极绕线圈旋转可产生电流(旋转磁极式发电机原理); (2)电动机和发电机的结构是大同小异的,但是
The breeze ceiling fan has the advantages of safety, energy saving, convenience, etc. The experiments performed with the breeze fan also have the features of being easy to carry and easy to operate. Here are some examples of teaching applications. 1. Demonstration of “Magnetic Generator” and “Motor The relationship between the generator and the generator.” The common micro-wind fan motor has its rotor in the outer layer and consists of 8 pairs of magnetic poles. It is fixed in the inner layer and consists of coils. After the alternating current is passed, the outer rotor (magnetic pole) rotates to turn the electric energy. Converting to mechanical energy. As shown in Fig. 1, an AC voltmeter is connected to the plug of the breeze fan (for example, the AC 100 volts of the universal meter). The fan blade is moved by hand to drive the rotor (magnetic pole) to rotate due to electromagnetic induction. An induced current will be generated in the stator (coil), so the electric fan becomes a “generator”. It can be explained that: (1) The magnetic pole rotates around the coil to generate current (rotary pole generator principle); (2) Motor The structure of the generator is similar, but