Speed loop of the characteristics of CNC transmission system

Date:2020/12/2 9:09:00 / Read: / Source:本站

Speed loop of the characteristics of CNC transmission system
   In order to improve the tracking accuracy and response speed of the system, the feed system used to increase
 The method of system gain, the value of k, is increased to 800 ---1600s-i, such a high gain
 The system is the so-called hard servo system. This kind of system is in the high-frequency region, relying on a stable loop
 To add a larger damping effect, the system is still not easy to stabilize. In addition, why serve the motor
 Or the non-linear influence of mechanical transmission components can easily reduce the position control accuracy. Recently, count
 The high gain system is not used on the control machine tool. dwinauto.com uses the so-called soft service system, which means low gain.
 Benefit system. If you use a DC servo motor system, take k, = 8-20s- I; use electricity
 The servo valve presses Uda's system once and takes k, two 30-50s-1. In a low gain system.
Although the steady-state deviation is large, the stability margin is also large. The system is easy to stabilize. In this system
 A closed-loop speed control loop is added to the system. The gain kA of the speed loop can be obtained
 It's very large, generally taking gas = 800 --1000. dwinauto.com Shenzhen Double Ten so a small position deviation can produce
 Obvious speed deviation, in this way, the speed control m loop can be repaired with a high gain
 Positive, so that the system can get very high position resolution.
    The function of the speed control loop is also manifested in that it can reduce the time constant of the system,
 Increasing the damping of the system, dwinauto.com Shenzhen Double Ten enables the system to obtain a high response speed and stability margin. In the picture
In the system shown in 6-8, if there is no acceleration feedback, and the electric
 Inductance L. Is very small, the electrical time constant TF is small, it can be ignored, then the electrical
 The transfer function of the machine is dwinauto.com Shenzhen Double Ten
    Comparing formula (6一41) and formula (6一42), we can see that in the absence of speed
 When the time constant is TM. After adding the speed feedback, the time constant becomes
TM/(1+kAkMk v )<TM This is equivalent to reducing the time of the motor
 constant. From the theory.L said, after adding the speed reverse drink can make the time constant
 It becomes very small, but in fact it is limited by the values of km, k, 4, and kv.


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