Linear motor applications continue to increase market demand

linear actuator point,

According to experts, the linear motor transport system places the primary windings of converters, traction control equipment, and linear induction motors on ore carts. The reaction plates of linear induction motors are laid along the lines, creating traction between the primary and the secondary, and pushing the trolleys. run. As a propulsion power, linear motor is different from the existing five kinds of transportation methods of wheel-rail (railway, urban rail), highway, aviation, waterway, and pipeline transportation. It is called the sixth mode of transportation, with a large climbing slope and land occupation. Less, low investment, fast speed, smooth operation, easy to implement automatic control, no noise, operation and maintenance, and low cost of energy consumption, is a green transportation method.

What is a linear motor? What will happen to the industrialization of linear motors?

Four advantages over rotary motors

A linear motor is a novel motor that directly converts electric energy into linear motion mechanical energy. Rotary electric motors have almost all kinds of linear motors, their application range is constantly expanding, and they have been made available in places where it can uniquely function. Satisfactory results.

First, the structure is simple. The linear motor does not need to go through the intermediate conversion mechanism and directly generate a linear motion, which greatly simplifies the structure and reduces the movement inertia. At the same time, it also increases the reliability, saves the cost, and makes the manufacture and maintenance easier. Its initial sub-level can directly become a part of the organization. This unique combination makes this advantage further manifested.

Second, for high-speed linear motion. Because there is no constraint of centrifugal force, higher speeds can be achieved. Moreover, if the gap between the primary and secondary air cushions or magnetic mats is preserved, there will be no mechanical contact during movement, and therefore the moving part will be free from friction and noise. In this way, the drive components are not worn, which can greatly reduce the mechanical losses, thereby increasing the overall efficiency, and also improving the sensitivity, rapidity, and follow-up of the system.

Maglev train applications are linear motor technology. Utilizing the concept of “first-secondary” air cushions or magnetic mats to preserve gaps and no mechanical contact during movement, maglev trains really became possible. Maglev trains changed the way traditional railcars were propelled by wheel-rail friction so that trains were on track. It is a major breakthrough in the history of traffic technology development and has been hailed as an ideal means of transportation in the 21st century.

Third, high positioning accuracy. In the place where linear motion is needed, the linear motor can realize direct transmission, so it can eliminate various positioning errors brought by intermediate links. Therefore, the positioning accuracy is high. If microcomputer control is used, the positioning accuracy of the entire system can be greatly improved.

This feature of the linear motor is of great significance for high speed computing computer equipment. On the host computer, in terms of hard disk drives, the linear servo motor was first used on the IBM 2314 main drive, and later on the IBM 333. Panasonic also uses a linear servo motor on a 3.5-inch disk drive. With a linear motor, the computer effectively shortens access time and improves work efficiency.

In addition, linear motors are also used in computer input and output devices. For example, Japan's Kobelco Electric Co., Ltd. and Fujitsu Co., Ltd. used linear stepper motors and linear DC motors for printers, achieving improved resolution and stop accuracy, as well as better acceleration characteristics. Matsushita Electric Co., Ltd. uses a linear servo motor to drive a digital scanner, which reduces the overall weight of the scanner, increases the starting thrust, reduces image fluctuations, and increases the scanning speed by nearly five times.

Fourth, the work is safe, reliable and has a long life. The linear motor can realize the non-contact transmission force, and the mechanical friction loss is almost zero, so the failure is less and maintenance-free, so the work is safe and reliable, and the service life is long.

The Vancouver Skytrain, which is driven by a linear induction motor, transported 450 million passengers safely over a 14-year period. The operating mileage exceeded 1 billion kilometers and maintained a long-term record of safe operation. Japan was in Osaka, March 7, 1990. The line uses a linear induction motor-driven subway. In 1991, after the Tokyo Metro line 12 used a linear motor to drive the subway, Kobe, Yokohama, Fukuoka, Sendai, and other cities also introduced linear motor subways.

In China, a new type of linear motor metro vehicle developed by CSR Qingdao Sifang was put into operation on the Guangzhou Metro Line 5 in early 2011, while the new linear motor subway vehicles are on Line 4, Line 6, and Line 7 of Guangzhou Metro. Some are already in use, and some will be used.

The penetration of the entire field of linear motor technology has caused a sharp increase in market demand. High demand will inevitably bring more business opportunities. However, for domestic linear motor companies, how can we grasp this "surge" wealth?

Will upgrade traditional manufacturing

The theory of linear motors has long appeared in the late 19th century, but it was not until the mid-1950s that the theory and application of linear motors developed rapidly. In the mid-1990s, many companies in the world had manufactured linear motor transmissions and took the lead in high-speed machine tools.

In 1993, Ex-cell-O company in Germany exhibited the world's first ultra-high speed machining center using linear motor drive technology at the Hannover International Machine Tool Expo. The machine's maximum rapid movement speed is 60m/min. Japan's machine tool equipment is developing rapidly, and high-end machine tools use a large number of linear motor drive technologies.

The research of linear motor technology in China began in the 1970s. Shanghai Electric Machinery Factory, Ningbo University, Shenyang University of Technology, Tsinghua University, National University of Defense Technology, Zhejiang University, Guangdong University of Technology and other universities have done related research, but failed to achieve real Apply to high-speed machine tools. As China enters the stage of industrial development and upgrading of advanced manufacturing industries, the opening of the Shanghai Maglev train in 2002 marked a new stage in the research, application and development of linear motor in China, and gradually narrowed the gap with the world leader. gap.

Although China's linear motor research has made some achievements, compared with foreign countries, there is still a big gap in its promotion and application. No matter whether the product's performance, variety, or application are in the initial stage, even a large number of them are blank. Experts believe that if we can't catch the current market demand, we will catch up with the development and application of linear motors and their drive control technologies. Our country will have high-efficiency drive, energy saving and emission reduction, and safety production in many areas. A lot of hidden dangers.

At present, many domestic research institutions have already noticed this. The long-stroke permanent-magnet linear servo unit studied by the Institute of Manufacturing Engineering, Tsinghua University, has a rated thrust of 1500N, a maximum speed of 60m/min, and a stroke of 600mm. The research focus of Shenyang University of Technology is on the control method and servo of a permanent magnet synchronous linear motor. System; At the China International Machine Tool Fair 2003, Beijing Institute of Electrical and Mechanical Technology High-Technology Co., Ltd. and Jiangsu Duoling CNC Machine Tool Co., Ltd. exhibited the first batch of vertical motor-driven vertical machining centers in China. The X and Y axes were adopted. Linear motor, maximum feed rate 60m/s. These studies have played an active role in the application of linear motor technology in domestic high-speed machine tools.

In China's machine tool industry, there are more and more products using linear motor feed systems. At the China International Machine Tool Show in April 2007, the application of linear motors became more and more widespread. Hangzhou Machine Tool Group introduced the first time a surface grinder using linear motors in China.

The new linear motor transport system jointly developed by Northern Jiaotong University, Chinese Academy of Sciences, Inner Mongolia University of Science and Technology and Mengtai Coal and Electricity Group fundamentally changed the current mode of coal flocking mainly based on automobile transportation and railway lines, and solved the constraints. China's coal transportation bottlenecks.

It is reported that this project has been listed in the National Science and Technology Support Program, which will form a complete independent intellectual property right and a full set of technical standards system for China's new linear motor transportation system. It will also establish a corresponding R&D center, manufacturing base and promotion base.

Experts believe that the development and application of linear motors in various industries all reflect the strong momentum of linear motors. China has vigorously developed advanced manufacturing industries. The linear motor industry, as its hidden basic industry, is of great significance to advanced manufacturing.

On the other hand, the application of linear motors has also contributed to the improvement of productivity of labor-intensive enterprises in China. For example, labor-intensive industries such as food processing, batteries, and toy processing usually require a large amount of labor resources. If the production line is upgraded to an automated production line driven by a linear motor, the company will overcome labor shortages, save labor costs, and reduce product production costs. Play an active role.

It can be seen that the development of linear motors in China is imperative and has unlimited potential.