What are the ways of linear motor drive control technology?
Release time:
2022-01-10
A linear motor application system must not only have a good performance of the linear motor, but also must have a safe and reliable conditions to achieve technical and economic requirements of the control system. With the development of automatic control technology and microcomputer technology, there are more and more linear motor control methods. The research on linear motor control technology can basically be divided into three aspects: one is the traditional control technology, the other is the modern control technology, and the third is the intelligent control technology.
A linear motor application system must not only have a good performance of the linear motor, but also must have a safe and reliable conditions to achieve technical and economic requirements of the control system. With the development of automatic control technology and microcomputer technology, there are more and more linear motor control methods. The research on linear motor control technology can basically be divided into three aspects: one is the traditional control technology, the other is the modern control technology, and the third is the intelligent control technology.
Traditional control techniques such as PID feedback control and decoupling control have been widely used in AC servo systems. PID control contains the past, present and future information in the process of dynamic control, and the configuration is almost optimal, with strong robustness, is the most basic control mode in the AC servo motor drive system. In order to improve the control effect, decoupling control and vector control technology are often used.
Under the condition that the object model is determined, does not change and is linear, and the operating conditions and operating environment are determined and unchanged, it is simple and effective to adopt the traditional control technology. However, in high-precision micro-feed high-performance occasions, it is necessary to consider the changes in the structure and parameters of the object. A variety of nonlinear effects, changes in the operating environment and environmental interference and other time-varying and uncertain factors, in order to get a satisfactory control effect. Therefore, modern control technology in the study of linear servo motor control has attracted great attention. Common control methods are: adaptive control, sliding mode variable structure control, robust control and intelligent control.
In recent years, intelligent control methods such as fuzzy logic control and neural network control have also been introduced into the control of linear motor drive systems. At present, the fuzzy logic, neural network and PID, H-control and other existing mature control methods are combined to obtain better control performance.
The linear motor is similar to the ordinary motor in principle. It is only the expansion of the cylindrical surface of the motor, and its types are the same as traditional motors, such as: DC linear motor, AC permanent magnet synchronous linear motor, AC induction asynchronous linear motor, stepper linear motor, etc.
As a linear servo motor with controllable motion accuracy, after it appeared in the late 1980 s, with the development of materials (such as permanent magnet materials), power devices, control technology and sensing technology, the performance of linear servo motors has been continuously improved, and the cost has been increasing. Decline has created conditions for its wide application.
In recent years, the progress of linear motor and its drive control technology is shown in the following aspects:
(1) continuous improvement of performance (such as thrust, speed, acceleration, resolution, etc.);
(2) The volume decreases and the temperature rise decreases;
(3) the variety covers a wide range, which can meet the requirements of different types of machine tools;
(4) Significant cost reduction;
(5) Easy installation and protection;
(6) Good reliability;
(7) the supporting technology, including numerical control system, is becoming more and more perfect;
(8) high degree of commercialization.
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