混合式步进电机的转子用永久磁钢，由励磁和永磁产生的电磁力矩实现步进运行。
Hybrid stepping motor rotor with permanent magnets, excitation and produced by permanent magnet electromagnetic torque realize stepping operation.
另外，用两极之间的电流表示励磁绕组磁动势，对应于各极之间磁场的大小和方向。
Also, MMF of the field winding is represented as electric currents in the gap between poles, with regard to magnitude and direction of magnetic field at respective poles.
结合当前电力系统的实际需要，提出了稳定计算用励磁系统数学模型仿真建模及参数校核方法。
The simulation modeling method of excitation system for stability calculation and the check method of parameters are proposed based on the current need of power system.
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