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在近年高考及各地高考模拟试卷中,有一些涉及正弦交变电流的题目,而这些题目中正弦交变电流的产生也有几种不同的类型.下面举例分析. 类型1 在匀强磁场中,线圈绕垂直于磁场方向的转轴匀速转动,线圈中产生正弦交变电流,这是交流发电机的模型 若线圈从中性面开始计时,交变电动势的瞬时值表达式为e=E_msinwt,其中,E_m=nBSw,与线圈的形
In the recent college entrance examination and local college entrance examination simulation test papers, there are some topics involving sinusoidal alternating currents, and there are several different types of sinusoidal alternating current generation in these topics. The following examples are analyzed. Type 1 In a uniform magnetic field, coils Rotating around the axis perpendicular to the direction of the magnetic field at a constant speed, the sinusoidal alternating current is generated in the coil. This is the model of the alternator. If the coil is clocked from the neutral plane, the instantaneous value of the alternating electromotive force is expressed as e=E_msinwt, where E_m= nBSw, with the shape of the coil