The composition of the linear motor module includes the rotor, stator, and base. The most important part is the encoding system. The biggest advantage of the linear motor module is its advantages in load, speed, acceleration, and accuracy. As an accuracy feedback system, the encoder is equipped with a grating ruler under different conditions.

Through the analysis of the principle of linear motor structure, the grating ruler adopts the principle of imaging photoelectric measurement. The infrared LED light is reflected by the grating ruler and forms a signal of alternating brightness and darkness at the grating sensor;

Linear motor encoders are usually selected from two good brands: Gaochuang and Gugao.

The magnetic grid ruler uses magnetic recording to form a ruler, which then senses changes in magnetic poles to generate signals.

    Comparative analysis of grid spacing details: The grid spacing of a grating ruler is generally 40 microns or 20 microns, with higher ones being 2 microns. Such grid spacing scales are accurate, have small errors, and can achieve high precision. The resolutions of commonly used gratings on the market are 0.1 μ m, 0.2 μ m, 0.5 μ m, 1 μ m, etc; For the magnetic grid ruler signal, it presents an NS layout with a grid spacing of 4 millimeters or 2 millimeters. The effective subdivision of 2 millimeters can reach 20 times, which is already very high-precision. The commonly used magnetic grid encoder on the market now has a resolution of 1 μ m. However, the magnetic grid ruler used by RYK in this industry adopts a special magnetization method that uses high-performance magnetic resistance to detect the magnetic boundary of the original components, thereby achieving high-precision anti-interference performance. The resolution of the magnetic grating ruler can achieve 1 μ m, 0.5 μ m, and 0.2 μ m, and in some cases, it is used to replace the grating. Attention to details when designing and assembling encoders: Firstly, pay attention to the distance between the ruler and the motor stator in the design, and avoid getting too close, especially the magnetic grid, which is more susceptible to interference and demagnetization. Ensure that there is a distance of more than 20MM between the ruler and the motor assembly position; Secondly, the installation of the ruler surface requires precision assurance, usually between 2 to 5 threads, and the cleanliness of the assembly surface should be ensured; Once again, when assembling the ruler, use the unique fixture of the encoder to ensure the accuracy of attaching the ruler; Finally, pay attention to adjusting the encoder signal to achieve the best signal range.

From a precision perspective, the accuracy of grating rulers is better than that of magnetic grating rulers, and they are also more susceptible to interference. Of course, from an economic perspective, grating rulers are also more expensive than magnetic grating rulers, and the prices of domestically produced and imported grating rulers are also different.

Choosing the appropriate grating ruler and magnetic grating ruler requires selecting the appropriate configuration based on your own actual needs