loop feeding meaning in Chinese

环行供电

In service both in loop feed and terminal feed , and power supply reliability is improved
环网和终端供电均可使用，运行方便，供电可靠
The design of excitation power source based on principle of three phase step motor and pulse width modulation ( pwm ) technology , intelligent power model ( ipm ) is used for inverter switches , the output ac pulse used as excitation signals . the speed of rotation and magnetic intensity can be changed by regulate the exciting converted frequency and magnitude of exciting current . constant current is achieved by closed loop feed back
励磁电源结合步进电机原理与脉宽调制技术,选用智能功率模块ipm作为逆变开关器件,输出交流脉冲励磁信号,以调节励磁转换频率和励磁电流大小为手段,实现对磁场旋转频率和磁场强度大小的有效调节,并通过闭环反馈实现闭环恒流控制。