What kind of controoer used in CNC lathe? PD, PI or PID Control?
* PID with some improvements. * A proportional-integral-derivative (PID) is a generic feedback loop control mechanism widely used in industrial control systems. A PID controller attempts to correct the error between a measured process variable and a desired setpoint by calculating and then outputting a corrective action that can adjust the process accordingly. The PID controller calculation (algorithm) involves three parameters: the proportional, integral and derivative securities. The proportional value that determines the reaction to the current error, the Integral determines the reaction based on the sum of recent errors and the resulting reaction determines the rate at which the error has been changing. The weighted sum of these three actions is issued to a control element, such as the position of a control valve or power a heating element. to "tailor" the three constants in the PID control algorithm can provide PID control action designed for specific process requirements. The response of the controller can be described in terms of the responsiveness of the controller to an error, the degree to which the driver exceeded the setpoint and the degree of oscillation of the system. Note that the use of PID control algorithm for control does not guarantee an optimal system. Http: / / en.wikipedia.org / wiki / PID_controller
Posted on 18:25, March 13th, 2010 by 
Tags: 
Posted in 
