基于PLC电机速度监测的程序设计

Programming for Motor Speed Monitoring Based on PLC

电机转速是判定电机运行状态的关键参数,也是电机事故频发的主要原因之一,所以对电机的转速进行监测至关重要,以光电编码器作为脉冲发生器,常规PLC的定时器进行时间间隔,计数器对单位时间内电机高速脉冲进行记数。设计了一种对电机超速或欠速进行监测的应用程序,速度监测方法的优点是;实时性好,精度高。

Motor speed is a key parameter for judging operational status of the motor, and one of the main reasons for frequent motor accidents as well. Therefore, monitoring of motor speed is of great importance. We use a photoelectric encoder as pulse generator and a conventional PLC timer to determine time interval. A counter is used to count the high-speed pulses of the motor during the unit interval. An application program is designed to monitor over/under-speed of the motor. The speed monitoring method has the advantages of good real-time property and high accuracy, speed, a monitoring of motor speed design, application of monitoring the motor overspeed or lack of speed, according to the M method can get the rotation speed of the motor.