摘要
现在很多可编程控制器(PLC)中集成了高速脉冲输出功能,这为运动控制提供了方便,但是高速脉冲输出的占空比一般固定不变,这使PLC直接应用到直流伺服电机调速系统中出现了困难。选用L298N驱动芯片,充分利用PLC高速脉冲输出功能,在不增加外围器件情况下,提出定占空比调频调速的方法,并将其应用到IC卡生产线。实际应用结果表明直流伺服电机的转速与PLC脉冲输出频率成线性关系,定占空比调频能够在一定条件下实现电机的精确调速。
Many programmable logic controllers （PLC） have integrated high-speed pulse output functions, which provide convenience for motion control. But high-speed pulse output of fixed duty cycle caused difficulties when PLC directly applied to the PWM speed regulation of DC servo motor. Took full use of PLCrs highspeed pulse output selected the driver chip L298N, and proposed the method of adjusting the frequency to change speed at fixed duty cycle without extra external devices and applied to production line of IC card. Experimental result shows the DC servo motor speed and the pulse output frequency is linear relationship. The method can achieve the precise speed regulation of DC servo motor.
出处
《电气传动》
北大核心
2012年第7期73-76,共4页
Electric Drive
关键词
调频调速
定占空比
伺服电机
可编程控制器
speed regulation by adjusting frequency
fixed duty cycle
servo motor
programmable logic controller
