步进式伺服系统的自动升降速控制设计

The Design of Auto Acceleration and Deceleration Control for Stepping Servo System

首先介绍了FX系列PLC斜坡信号输出指令RAMP的功能、特点以及应用方法.根据三相六拍通电方式的脉冲步进电动机的控制要求,用RAMP指令设计控制程序,使步进电动机变速启动时,从零速按所希望的斜率自动升至高速运行;停机时,也按同样斜率从高速逐渐降至零速而停止运行,以保证步进电动机启动和停机时的平稳性.同时可使步进电动机的最高运行频率提高2～8倍而不失步.

The functions, features and application methods of RAMP of the FX series PLC were described. The control program was designed in RAMP instructions according to the control requirement of the three - phase six - beat pulse stepper motor. When the stepper motor starts, the status auto changes from zero speed status to high speed status according to the given slope, and it changes from high speed status to zero speed status gradually when the stepper motor stops. In this method, the stepper motor starts/stops smoothly, and the max frequency is increased 2 -8 times but not asynchronous.