Based on the basic equation of A.C. exciting alterna tor,the vector chart and power flow chart of the alternator are studied,and a me thod of variable-speed and constant frequency (VSCF) is proposed.

• 从交流励磁发电机的基本方程出发，通过对其矢量图和功率流程的研究,提出了变速恒频的实现方法。