1. It features new type stepmotor control system and real metering mechanism adjustable without shutdown the machine.
   采用新型步进电机调整机构及真正不停机调整计量机构。
2. The driving principles and methods of step motor are introduced in this article and the stepmotor driver circuit is increasingly designed.
   阐述了步进电机驱动原理和方法,并设计出了一种步进电机的驱动电路。

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