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一、正弦交流电的四值问题 1．最大值当线圈平面与磁感线平行时, 电动势最大,即Em=NBωS．最大值与线圈形状和转轴位置无关,在计算电气元件和用电器耐压时,往往用到交流电的最大值． 2．瞬时值交流电流的瞬时值反映的是不同时刻交变电流大小和方向,正弦交流电的瞬时值为e=Emsinωt,(中性面开始计时)．在计算电动势、作用力、力矩、功率等物理量的瞬时值时要用到交流电的瞬时值． 3．平均值交变电流的平均值是交变电
First, the four-valued problem of sinusoidal alternating current 1. Maximum When the coil plane is parallel to the magnetic induction line, the electromotive force is maximum, that is, Em=NBωS. The maximum value has nothing to do with the shape of the coil and the position of the shaft. When calculating the withstand voltage of electrical components and electrical appliances, the maximum value of the alternating current is often used. 2. The instantaneous value of the instantaneous AC current reflects the magnitude and direction of the alternating current at different times. The instantaneous value of the sinusoidal AC is e=Emsinωt (the neutral plane starts timing). In the calculation of the instantaneous value of the electromotive force, force, torque, power and other physical quantities, the instantaneous value of AC is used. 3. The mean value of the alternating current is the alternating current