Magnetic Materials in Linear Motors
Linear motor is a kind of transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion. It can be regarded as a rotating motor that is radially dissected into a plane (that is, a rotating motor is flattened, and works the same).
Linear motors are similar to rotary motors. After electrification, a magnetic field will be generated in the air gap. If the end effect is not considered, the magnetic field is sinusoidally distributed in the linear direction, but this magnetic field is translated rather than rotated, so it is called a traveling wave magnetic field. The interaction between the traveling wave magnetic field and the secondary produces electromagnetic thrust, which is the basic principle of linear motor operation.
The linear motion of traditional linear transmission devices is mostly realized by rotating motors and related transmission devices such as chains, belts, screws, etc. The entire system is large in size, low in efficiency, and poor in accuracy. Compared with rotary motors, linear motors have simple structure, high positioning accuracy, fast response speed, high sensitivity, good follow-up, safe and reliable work, and long life.
The stator in the linear motor adopts NdFeB permanent magnet material or samarium cobalt permanent magnet material with high magnetic energy product, high remanence and strong coercive force, and the N poles and S poles of the magnets are arranged alternately.