中文摘要：

三维电控位移平台控制系统采用一片AT89C52，在占用较少片上资源的情况下，实现了对3个步进电机的速度控制、限位保护等。采用串行变速和并行匀速相结合的方法，满足手动控制和自动控制在速度上的不同要求。描述了系统的硬件配置、电路的端口分配及工作原理，详细讨论了串行变速和并行匀速2种速度控制及限位保护的实现方法。

英文摘要：

3-dimensional electric moving stage control system that used by a AT89C52, with only a few of on - chip resources, speed control, position limiting protection,etc. , for three step motors were achieved. Serial varying speed control and parallel uniform speed control were combined to meet different speed demands in manual and auto control mode. The hardware configuration, the port arrangement and operating principle of the circuit were described. Serial varying speed control, parallel uniform speed control, and position limiting protection methods were discussed in detail.