基于PLC的恒功率液压马达自动控制系统设计

Design of Automatic Control for Constant Power Hydraulic Motor System based on PLC

针对传统伺服式恒功率液压马达存在的问题,开发出基于PLC的恒功率液压马达自动控制系统。该系统测算液压马达的输出功率,经下位机的PID运算后,输出PWM信号,控制电液比例方向阀,驱动液压马达的变量机构,调节马达的每转排量从而控制它的转速,确保液压马达的输出功率维持在某一设定值上。该控制系统能提高恒功率液压马达的控制精度和抗干扰能力,可以考虑在船用起货机、绞缆机、锚机和舵机等液压系统上推广应用。

Aiming at the problems existing in the traditional servo-type constant power hydraulic motor,the automatic control system based on PLC is developed.The system measures the output power of the hydraulic motor.After the PID operation of the lower machine,the output PWM signal controls the electro-hydraulic proportional direction valve,drives the variable mechanism of the hydraulic motor,adjusts the displacement of each revolution of the motor to control its speed,and ensures that the output power of the hydraulic motor is maintained at a set value.The control system can improve the control accuracy and anti-interference ability of the constant power hydraulic motor,and can be widely used in Marine cargo winch,mooring winch,windlass,steering gear and other hydraulic systems.