What are the characteristics of linear motors?Application of linear motors

The linear motor can be considered as a deformation of the rotary motor in terms of structure. It can be regarded as a rotary motor cut along its radial direction, and then flattened and evolved. In recent years, with the high-speed development of automatic control technology and microcomputers, higher requirements have been placed on the positioning accuracy of various automatic control systems. The advanced linear motion drive equipment is far from satisfying the requirements of modern control systems. For this reason, many countries in the world have been studying, developing and using linear motors in recent years, making the application of linear motors more and more extensive.

Compared with the rotary motor, the linear motor mainly has the following characteristics: First, the structure is simple. Because the linear motor does not need to turn the rotary motion into an additional device for the linear motion, the structure of the stability system itself is greatly simplified, and the weight and volume are greatly reduced. Second, the positioning accuracy is high. In the place where linear motion is required, the linear motor can complete the direct transmission, so it can eliminate various positioning errors caused by the base link, so the positioning accuracy is high. The positioning accuracy of the whole system of ground trekking; the third is fast response, high flexibility and good follow-up. The linear motor simply makes its mover supported by magnetic levitation, so that there is always a certain air gap between the mover and the stator without touching, which eliminates the contact resistance between the stator and the mover, thus greatly improving the system. The flexibility, flexibility and follow-up; Fourth, the operation is safe and reliable, and the service life is long. The linear motor can achieve no-touch transmission force, and the mechanical friction loss is almost zero, so there are few defects and no repairs, so the operation is safe and reliable, and the service life is long.

Linear motors are mainly used in three aspects: first, they are used in active control systems, and there are many such applications; second, they are used as drive motors for long-term direct connection operations; Linear motion energy equipment.

——High-speed maglev train The maglev train is the most typical example of the practical application of linear motors. At present, the United States, Britain, Japan, France, Germany, Canada and other countries are developing linear levitation trains, among which Japan is the fastest.

——Elevator Driven by Linear Motor The first elevator driven by linear motor was installed in Wanshi Building, Guam District, Tokyo, Japan in April 1990. The elevator has a load of 600kg, a speed of 105m/min and a travel height of 22.9m. Since the elevator driven by the linear motor has no traction unit, the machine room at the top of the building can be omitted. Assuming that the height of the building increases to about 1000 meters, it is necessary to use a wire rope-free elevator. This elevator is driven by a linear motor with high-temperature superconducting technology, the coil is installed in the hoistway, and the car is equipped with high-performance permanent magnet materials. Like the maglev train, it is controlled by radio waves or light control technology.

——When the ultra-high-speed motor rotates beyond a certain limit, the motor using the rolling bearing will cause sintering and damage. For this reason, over the years, a linear suspension motor (electromagnetic bearing) has been developed abroad. The suspension technology is used to make the mover of the motor levitate in the air, eliminating the mechanical contact and resistance between the mover and the stator, and its rotational speed can reach 25,000 rpm. ~100000r/min or more, so it is widely used in high-speed motors and high-speed spindle components. For example, the 5-axis controllable electromagnetic high-speed spindle for multi-process automatic CNC lathes recently developed by Yaskawa Corporation of Japan uses two radial electromagnetic bearings and one axial thrust electromagnetic bearing, which can bear the load of the machine tool in any direction. At the base of the shaft, in addition to the high-speed motor, it is also equipped with a tool automatic communication device that is used to multi-process automatic CNC lathes.

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