大学毕业设计__桥式起重机的变频调速.docVIP

毕业设计（论文） 论文题目：桥式起重机的变频调速 系 部： 电气工程系 专 业： 电机与电器 班 级： 2013级01班 学生姓名： 学 号： 指导教师： 2016年05月06号 摘要 桥式起重机作为物料搬运系统中的一种典型设备，在工业生产中应用广泛，作用显著。因此对于提高桥式起重机的运行效率，确保运行的安全可靠性，降低物料搬运成本是十分必要的。 本文根据桥式起重机大车运行的特点，采用分散驱动，结合变频调速技术，完成了桥式起重机固定三段频率的调速。将PLC作为逻辑控制器，并且为其设计了梯形图，将凸轮控制器的信号作为PLC的输入信号，PLC的输出接中间继电器线圈，通过继电器的触点控制变频器的数字输入口实现与变频器相连的两台电动机的变频调速。为了方便控制和应急处理，设计了起动、停止、故障复位和急停按钮。同时可以将电动机铭牌相关参数输入到变频器，运用变频器的保护功能保护电路。通过本设计可以控制电动机的起动、停止、运行方向、速度换挡和故障复位。从而减少了传统继电—接触式控制系统的中间环节，减少了硬件和控制线，极大提高了系统的稳定性和可靠性。 关键词 ：桥式起重机，凸轮控制器，可编程序控制器，变频调速 ABSTRACT Bridge crane as a material handling system of a kind of typical equipment, is widely used in industrial production, significant role. Therefore to improve the operating efficiency of the bridge crane to ensure the safety and reliability of operation, reduce material handling costs is very necessary. The according to the characteristics of the crane operation, adopting the driving of disperse, combining with the technology of frequency conversion, completed the bridge crane fixed frequency speed control. The PLC as logic controller, and the design of the ladder diagram, the cam controller signal as the input signal of the PLC, the PLC output connected to an intermediate relay coil, through the contacts of the relay control of the digital converter input port and inverter connected two motor variable frequency speed regulation. In order to facilitate control and emergency treatment, the design of the starting, stop, reset the fault and emergency stop button. At the same time the motor nameplate parameters input to the inverter, Using inverter protection circuit protection. Through this design can control the motor starting, stop, running direction, shift speed and fault reset. Thus reducing the traditional relay - contact type control system of intermediate links, reducing the hardware and control line, greatly i