But it has main key problems such as long response time, low speed stiffness, imperfect control performance and efficiency because "of. it includes inverter and electromotor. The main research contents are as follows.
但是，由于大功率大惯性变频泵控马达调速系统包括了变频器和电机环节，使得整个调速系统存在响应慢、速度刚性低、控制特性差及效率等主要难点问题。
参考来源 - 变频泵控马达调速及补偿特性的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
并用方块图与反馈控制理论导出了这种调速回路速度刚性的数学表达式，估算了由负载引起的速度误差。
By block diagram and feedback-control principles expression is derived for speed-stiffness in the loop and speed error due to load calculated.
采用竹帘卷内放置有孔棱的空心刚性轴进行束缚干燥，可以有效提高干燥速度和干燥质量；
We have adopted the method to place a hollow rigidity axle (with hole and ridge) in the bamboo curtain reel to proceed bound drying, which can improve drying velocity and drying quality effectively.
扩展速度能力，运行精度高，系统的刚性，低发热程度高，噪音低，振动水平只是表现的一些挑战。
Extended speed capability, a high degree of running accuracy, high system rigidity, low heat generation, and low noise and vibration levels are just some of the performance challenges.
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