The voltage ratio is derived and the system closed-loop control is realized with PI regulator.
从理论上推导了电压传输比，采用PI调节器实现了系统的闭环控制。
Software of the drive and control system realizes the current and speed closed-loop control, which contain PI adjuster.
软件部分是主要是实现对直线电机电流和速度的双闭环控制，电流和速度的调节均采用PI调节。
The current closed-loop system is composed of current controllers that control variable parameter PI.
并通过变参数PI数字电流控制器构成电流闭环系统。
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