matlab里怎么仿真串励直流电机？
在simulink里找了个DC machine的模型，想做串励直流电机的仿真，但仿真不对，看了下DC machine的help，发现只能用作他励直流电机，要怎么改才能作为串励直流电机用呢？Description
The DC Machine block and the Discrete DC Machine block (also in the Machines library) both implement a separately excited DC machine. The DC Machine block implements a continuous model, and the Discrete DC Machine block implements a discrete model. The following description applies to both blocks.
An access is provided to the field terminals (F+, F-) so that the machine model can be used as a shunt-connected or a series-connected DC machine. The torque applied to the shaft is provided at the Simulink input TL. 直接串起来 直接串起来试过了，仿真结果感觉不对，转速一直很低，
The DC Machine block and the Discrete DC Machine block (also in the Machines library) both implement a separately excited DC machine
这句话是说这个电机模型只能他励吗？
我用他励电机双闭环已经仿真好了，把这个电机改成串励的，仿真的结果就不对，转速一直很低。
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