基于LabVIEW的变频器多段速控制

摘要

In industrial applications,the inverter runs at different speeds at different times to realize the multistage speed control of the AC motor.LabVIEW was used to generate a specific section of the multistage speed control curve.The communication between inverter and upper machine was implemented through Modbus serial communication protocol,and the operation of the inverter was controlled according to the multistage speed control curve that was set in the upper machine.The parameter settings and multisegment speed control procedures between the inverter and the upper machine LabVIEW were analyzed in detail.The no-load test experiment of the control method and the test curve indicate that the control method can not only flexibly control the inverter according to different requirements,to realize the multistage speed operation of different segments,but also the output test curve can be perfectly matched with the set control curve.The control method overcomes the limitation of the number of inverter segments in multisegment speed control.%在工业应用中,变频器在不同的时间运行不同的速度来实现对交流电机的多段速控制.利用LabVIEW产生特定的多段速度控制曲线,通过Modbus串行通信协议实现变频器和上位机的通信,控制变频器按照上位机中设定的多段曲线运行.对变频器和上位机LabVIEW之间的参数设置、多段速控制程序详细分析.对该控制方法进行空载测试试验,试验测试曲线表明,该控制方法不仅能够根据不同需要灵活控制变频器,实现不同分段的多段速度运行,而且输出测试曲线能够与设定控制曲线完美匹配.克服了变频器自身在进行多段速度控制时分段数受限的缺点.