According to the requirements of synchronous speed control of series conveying belt, several patterns which could realize the synchronous speed control under frequency conversion was analyzed.
针对多级胶带输送机同步运行要求，分析了胶带机变频拖动同步运行实现的几种模式。
The efficiency of PLC control is increased at high speeds up to 95% of the synchronous speed.
PLC控制效率在同步速度达到95%时提高不少。
The newly designed backstepping control is implemented for permanent magnet synchronous motor (PMSM) to track speed commands, at the same time the design can provide better speed tracking performance.
设计的反推控制可以实现永磁同步电动机速度跟踪控制，保证系统具有良好的速度跟踪性能。
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