Servo motor maintenance is divided into mechanical part and electrical part.
1. The mechanical part is repaired for bearing damage replacement. Compared with the maintenance of ordinary motors, the bearing is only special. Because most servo motors are synchronous motors with magnetic poles on the rotor, common materials cannot solve the problem, so material customization becomes particularly critical, and the alignment requirements are higher than ordinary motors.
2. The electrical maintenance mainly includes the maintenance of winding, magnet and encoder.
As long as the original motor line and wire diameter can be wound back, the premise is to select high-quality copper wire.
Magnetization needs a certain technical content, which is usually external magnetization and disassembly magnetization. The former is suitable for the magnetization of some stator magnetic fields; However, dismantling and magnetizing requires skills. In addition to knowing the magnetic strength of the original motor, we also need to know the distribution and ensure the shape.
Most of the early servo motors used black magnets with slightly poor quality, and they were generally used shortly after magnetization. Some of them can cure the symptoms but not the root cause. In order to save costs, we can consider it, but we do not recommend it. We will re-select ferrite magnets that are resistant to high temperature and high electromagnetic interference for replacement.
Encoder replacement and maintenance is a test of the technical content of servo motor maintenance. After all, most of the imported servo motors are non-standard communication formats. The early incremental products can be matched and replaced with each other, but the new generation products have formed their own internal standards. Different manufacturers have different standard modes. In addition, the pulse density is too high. In addition, the encoder alignment has different algorithms, which makes the products of different brands lack commonality, which increases the difficulty of maintenance.
Source: Wangcai servo and motion control
