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

对于现代机床，为了实现高的快速进给速率，一直使用具有低传动比的进给驱动系统。然而，低传动比导致滑橇与伺服电机之间的惯性比不合适，这对可控性有负面影响。在本研究计画中，将针对不适当惯量比之进给驱动系统，发展一种新的控制方法。目的是增加位置控制回路的带宽。新方法综合了一个弱设置的电机速度控制器与一个额外的雪橇速度控制回路。在大多数情况下限制馈送系统的带宽的第一机械固有振动可以由电机衰减，其由弱设置控制器控制。外部叠加的滑橇速度控制回路在频域中提高了电机速度控制回路的相位和幅度，使得系统可以实现更高的带宽而无需任何额外的传感器或致动器。实验测量已在前期工作中进行，以检查该方法的功能。

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.