Knowledge
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Are high voltage motors more prone to vibration problems than low voltage motors?
Compared with low-voltage motors, high-voltage motors, especially high-voltage asynchronous motors, are mostly based on cage-type rotor structures. During the manufacturing and operation of the motors, due to improper matching of mechanical structural parts, the motors may cause severe vibrations...Read more -
Relationship between motor temperature rise and efficiency level
Recently, the results of random inspections on motor quality at different levels have been announced one after another. From the comparison of unqualified items, it can be found that the efficiency performance of high-efficiency motors is not in compliance with the standards, which is a very seri...Read more -
Mechanism of motor bearing damage caused by variable frequency power supply
The reason why the variable frequency power supply damages the motor bearings is that there is current flowing through the bearings, and this current is in a state of intermittent connection. The intermittently connected circuit will generate an arc, and the arc will burn the bearings. There are ...Read more -
How to Analyze the Special Functions of a Rotor from Its Surface Characteristics
From the structural analysis of the rotor, we can divide the motor rotor into winding rotor and squirrel cage rotor. In comparison, due to the particularity of the production and manufacturing of the winding rotor, the degree of freedom of its structure and slot shape change is relatively small, ...Read more -
How to control the radial clearance and positioning of the bearing to better ensure the performance of the motor?
In the previous article, we talked about the coaxiality control requirements of the motor bearing system. To ensure the coaxiality control requirements of the bearing system, the radial clearance and radial positioning control of the bearing are particularly critical and important. 0 1 ...Read more -
Why does a motor running at industrial frequency have shaft current?
The basic conditions for the formation of current are voltage and a closed circuit. The premise for the generation of shaft current is the existence of shaft voltage and a closed circuit. Why does a motor running at industrial frequency have shaft voltage? There are two reasons for the generation...Read more -
Do the implementation rules for energy efficiency labels corresponding to the GB30253 standard need to be revised?
After the release and implementation of the standard 30253-2013 “Energy Efficiency Limit Values and Energy Efficiency Grades for Permanent Magnet Synchronous Motors”, on April 22, 2020, the “Catalogue of Products Implementing Energy Efficiency Labeling in the People’s Re...Read more -
Sealed bearings, what problems will be encountered in the application of motor products?
According to the actual motor design, sealed bearings are used for small-sized motors, and the motor end cover has the dual functions of bearing chamber and bearing outer cover, thus eliminating the need for inner bearing cover, making the motor structure relatively simple, and naturally reducing...Read more -
Steps and points for replacing motor bearings
Bearings are key components in motors, responsible for supporting the rotating parts, reducing friction, and ensuring efficient operation of the motor. Damage to the bearings can lead to reduced motor efficiency or even more serious failures. Therefore, timely replacement of damaged bearings is e...Read more -
Why does the motor shaft breakage problem occur?
Any problem with a product is likely to be related to manufacturing or use. For example, the motor shaft breakage problem: On the one hand, the motor manufacturer will take necessary measures in the shaft design and manufacturing process, but whether the designed motor matches the operating condi...Read more -
Measures to eliminate electromagnetic interference
According to the basic principles of electromagnetics, the formation of electromagnetic interference ( EMI ) requires three elements: electromagnetic interference source, electromagnetic interference path, and system sensitive to electromagnetic interference. To prevent interference, hardware and...Read more -
Check the contents of grounding of electrical equipment
1. Check whether the connecting bolts are loose or rusted. 2. Check the corrosion of the grounding wire and grounding body below the ground, and whether they are desoldered. 3. Check whether the grounding wire is damaged, broken, corroded, etc. For the overhead power lines including the neutral l...Read more