Increased bandwidth of feed drives of machine tools with improper inertia ratio

在现代机床中，为了获得较高的快速进给速度，通常采用低传动比的进给传动系统。然而，传动比较低，导致滑台与伺服电机之间的惯性比不合理，影响了系统的可控性。在本研究项目中，将针对不适当惯性比的进给驱动系统开发一种新的控制方法。目标是增加位置控制环路的带宽。该方法将弱整定电机速度控制器与附加的滑车速度控制回路相结合。第一个机械固有振动在大多数情况下限制了进给系统的带宽，它可以由电机衰减，电机由一个弱设置控制器控制。外部叠加的雪橇速度控制环在频域中提高了电机速度控制环的相位和幅值，从而使系统在不需要任何额外传感器或执行器的情况下获得更高的带宽。在前期工作中进行了实验测量，以检验该方法的功能。

For modern machine tools, feed drive systems with low transmission ratio have always been used, in order to achieve a high rapid feed rate. However, the low transmission ratio leads to an improper inertia ratio between sled and servo motor, which has a negative effect on the controllability. In this proposed research project, a new control method will be developed for the feed drive system with improper inertia ratio. The objective is to increase the bandwidth of the position control loop. The new method synthesizes a weakly set motor speed controller with an additional sled speed control loop. The first mechanical natural vibration, which limits the bandwidth of the feed system in most cases, can be attenuated by the motor, which is governed by a weakly set controller. The outside superimposed sled speed control loop raises the phase and amplitude of the motor speed control loop in the frequency domain, so that the system can achieve a higher bandwidth without any extra sensor or actuator. The experimental measurements have been carried out within the pre-work to examine the functioning of this method.