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| Linear motors can also be called linear motors, linear motors, linear motors, and push rod motors. The common types of linear motors are flat plate and U-slot type. The typical composition of the coil is three-phase, with Hall elements to achieve brushless commutation. The side of the linear motor evolved from the stator is called the primary, and the side evolved from the rotor is called the secondary. In practical applications, the primary and secondary are manufactured into different lengths to ensure that the coupling between the primary and the secondary remains unchanged within the required stroke range.The linear motor needs the feedback device of the linear position-linear encoder, which can directly measure the position of the load to improve the position accuracy of the load. It can be short primary and long secondary or long primary and short secondary. Linear motor drive control technology not only requires a linear motor application system not only to have a linear motor with good performance, but also a control system that can achieve technical and economic requirements under safe and reliable conditions.With the development of automatic control technology and microcomputer technology, there are more and more control methods of linear motors. The research on linear motor control technology can basically be divided into three aspects: one is traditional control technology, the other is modern control technology, and the third is intelligent control technology. Traditional control techniques such as PID feedback control and decoupling control have been widely used in AC servo systems.Among them, PID control contains the information in the dynamic control process, has strong robustness, and is the basic control method in the AC servo motor drive system. In order to improve the control of linear motors, decoupling control and vector control techniques are often used. Under the condition that the object model is determined, unchanged and linear, and the operating conditions and operating environment are determined and constant, the use of traditional control technology is simple and effective. But in the high-performance occasions of high-precision micro-feed, the change of object structure and parameters must be considered. A variety of nonlinear effects, changes in the operating environment, and environmental disturbances and other time-varying and uncertain factors can achieve satisfactory control results. Therefore, modern control technology has attracted much attention in the research of linear servo motor control. Common control methods: adaptive control, sliding mode variable structure control, robust control and intelligent control. It is mainly to combine fuzzy logic, neural network with PID, H∞ control and other existing mature control methods, and learn from each other to obtain better control performance. |
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