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1.正弦式交流发电机 例1 磁铁在电器中有广泛的应用,如发电机.如图1所示,已知一台发电机转子导线框共有N匝,线框长为l1,宽为l2,转子转动的角速度为ω,磁极间的磁感应强度为B,试导出发电机的瞬时电动势E的表达式. 现在知道有一种强永磁材料钕铁硼,用它制成发电机的磁极时,磁感应强度可增大到原来的K倍,如果保持发电机的结构和尺寸、转子转动角速度、需产生的电动势都不变,那么这时转子上的导线框需要
1. Sinusoidal alternator Example 1 Magnets have a wide range of applications in electrical appliances, such as generators. As shown in Fig. 1, a generator rotor wire box is known to have a total of N匝, the wire frame is l1, and the width is l2. The rotational speed of the rotor is ω, and the magnetic induction between the magnetic poles is B. Try to derive the expression of the instantaneous electromotive force E of the generator. Now that there is a strong permanent magnet material NdFeB, use it to make the magnetic pole of the generator. The magnetic induction can be increased by a factor of K. If the structure and size of the generator, the rotational speed of the rotor, and the electromotive force to be generated are all maintained, then the lead frame on the rotor is required.