Optimal Control Method of Servo Motor Based on Servo Turret Controller

Abstract

The invention relates to an optimized control method of a servo motor based on a servo tool rest controller. The method comprises the following steps of automatically generating a shortest cutter replacing route of a servo tool rest by the servo tool rest controller, adopting the route as the transposition displacement for the servo motor to drive a cutter head to rotate, acquiring a speed and displacement of the servo motor at any moment in the cutter replacing process by utilizing a speed planning algorithm, adopting the displacement as a given value of the servo motor so as to execute the position closed-loop control, and driving the cutter head to execute the transposition cutter replacement; limiting the torque output of the servo tool rest controller by adopting a torque output time-division control algorithm when in the transposition cutter replacement process of the cutter head, so that the servo motor controls the cutter head to complete the transposition. By adopting the method, the programming difficulty of the control logic of a principal computer tool rest can be alleviated; the time of the cutter replacement process is shortened, and the cutter replacing efficiency can be improved; the overcurrent problem of the motor is effectively solved, and the device is protected; the utilization rate of the device is remarkably improved, and the service life of the device is remarkably prolonged.

Description

technical field [0001] The invention belongs to the field of numerical control tool post control, in particular to an optimal control algorithm of a servo motor based on a servo tool post controller. Background technique [0002] The servo tool post is a high-grade functional accessory of the machine tool. Compared with the traditional hydraulic tool post, this type of tool post has the characteristics of high reliability, fast indexing, good rigidity, simple structure, and stable operation. Since the domestic research and development of servo tool holders started later than abroad, there is still a big gap between my country's servo tool holders and the world's advanced level in terms of technical quality such as indexing time and indexing accuracy. There are mature professional servo product series for servo tool post. At present, there are two mainstream tool post control schemes in China: 1. With ordinary servo as the main body, the actions of servo tool post selection, p...

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Problems solved by technology

The disadvantages of the above two control schemes are that they occupy additional system resources, increase the cost unreasonably, and reduce the reliability of the equipment.

The position control methods of traditional tool post controllers are mostly linear acceleration and deceleration control, exponential acceleration and deceleration control, and S-curve acceleration and deceleration control. However, it is still unable to solve the contradiction between improving the tool change efficiency and reducing the mechanical start-stop impact, that is, if you want to reduce the mechanical start-stop impact, you cannot maximize the tool change efficiency; if you want to improve the tool change efficiency, you cannot guarantee the maximum reduction Mechanical start-stop impact, especially in the case of a small inertia motor driving a large inertia load, the phenomenon of servo motor overcurrent will occur with the mechanical start-stop impact

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