Application of linear motor

Linear motor is a kind of transmission device that directly converts electric energy into linear motion mechanical energy without any intermediate conversion mechanism. It can be seen as a rotating motor cut radially and developed into a plane.

From 1971 to now, linear motors have finally entered the period of independent application. The application of various linear motors has been rapidly promoted, and many practical devices and products have been made, such as steel pipe conveyors driven by linear motors, coal conveyors, various electric doors, electric windows, etc. The speed of maglev train driven by linear motor has exceeded 500km / h, which is close to the speed of aviation flight.

The research and application of linear motor in China began in the early 1970s. At present, the main achievements include factory driving, electromagnetic hammer, stamping machine, etc. Although some achievements have been made in the research of linear motor in China, there is still a big gap in its popularization and application compared with foreign countries. At present, many domestic research organizations have noticed this.

Linear motor is a kind of transmission device that directly converts electric energy into linear motion mechanical energy without any intermediate conversion mechanism. It can be seen as a rotating motor cut radially and developed into a plane.

The side evolved from the stator is called primary, and the side evolved from the rotor is called secondary. In practical application, the primary and secondary are made into different lengths to ensure that the coupling between the primary and secondary remains unchanged within the required stroke range. Linear motors can be short primary and long secondary, or long primary and short secondary. Considering the manufacturing cost and operation cost, short primary and long secondary are generally adopted at present. The working principle of linear motor is similar to that of rotary motor. Take linear induction motor as an example: when the primary winding is connected to the AC power supply, a traveling wave magnetic field will be generated in the air gap, and the secondary winding will induce electromotive force and generate current under the cutting of the traveling wave magnetic field, which will generate electromagnetic thrust when interacting with the magnetic field in the air gap. If the primary is fixed, the secondary moves in a straight line under the action of thrust; On the contrary, the primary level moves in a straight line. Linear motor www.51zh A linear motor application system must not only have a linear motor with good performance, but also have a control system that can realize the scientific 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 motor. The research on linear motor control technology can be basically divided into three aspects: the first is traditional control technology, the second is modern control technology, and the third is intelligent control technology. Traditional control technologies such as PID reverberation control and decoupling control have been widely used in AC servo system. Among them, PID control contains the past, present and future information in the dynamic control process, and the configuration is almost optimal, with strong robustness. It is the most basic control pipeline in the AC servo motor drive system. In order to improve the control effect, decoupling control and vector control technology are often used.