Introduction - If you have any usage issues, please Google them yourself
The model obviously shows that the design of the model mainly consists of two negative feedback loops: current regulator and speed regulator,
Take the output of the speed regulator as the input of the current regulator, and control the circuit behind it through the output of the current regulator.
Here, the current loop is the inner loop and the voltage loop is the outer loop, so a DC speed regulation system with speed current double closed loop control is formed.