The paper presents a SPWM frequency variable and velocity variable system with SCR as main switching devices. The proposed scheme has been verified through experiment.
介绍一种以SCR作主开关器件的SPWM控制方式的变频调速系统，并通过实验对提出的方案进行了验证。
The lessons of this experiment have been learned through an existence that has been much more demanding than was ever imagined at the outset.
这个试验的课程是要在（比一开始想像的更加苛刻的）存在中学习。
This has occurred through the experiment and the different paths it took.
这是通过实验所产生的，可以有不同的道路来选择。
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