主从同步定时模式的转速变M/T法测量设计与实现

Research on Revolving Speed Measurement with Master-Slave Synchronous Timing Mode Based on Different M/T

针对旋转机械的转速测量问题,根据变M/T法原理,提出了一种主从同步定时模式的转速测量设计实现方法。设计了处理器内部两定时器同步计数协同工作方式,以及外部触发脉冲生成电路,由外部触发能够同时启动两定时器计数,并由主定时器在计数达到的条件下停止从定时器,两计数值同步对应。结合当前转速,可以动态设定主定时器计数条件,使本方法适合高、低转速测量应用。实验结果表明本方法相对测量误差小于0. 2‰、覆盖5～20 000 r/min的高低转速范围,并且软件处理简捷,易于实现,具有实用价值。

A master-slave synchronous timing mode implementation method of revolving speed measurement is put forward based on different M/T aimed at the rotating machinery in this paper.The MCU is set to make two timers synchronously count and cooperatively work,and the external trigger pulse generating circuit is designed.The external trigger can start the two timers at the same time,and the master timer can stop the slave timer under the condition of counting terminate that makes the two timers achieve synchronization.The counting value of master timer can be dynamically set according to the current speed,which makes this method suitable for high speed and low speed measurement applications.Experimental results show that the relative measurement error of this method is less than0.2‰,has wide measurement range of5r/min^20000r/min,and the processing routine is simple,easy to implement.