In the auxiliary systems of power plants, electric motors serve as the primary power source, ensuring the smooth and safe operation of the entire unit. Any failure in these motors can result in significant losses, particularly for medium-sized motors, which can severely impact the operational safety of the system. According to our statistical analysis of motor failures, over 60% of all motor faults are caused by bearing damage or issues related to bearings. Therefore, addressing bearing damage is a critical step in solving motor-related problems.
Medium-sized motors typically use either "end-cap sliding bearing" or "end-cap rolling bearing" structures. Based on our extensive experience in maintaining such motors, we have identified several key issues:
1. **End-Cap Sliding Bearing Type**: Many of these motors suffer from overheating and oil leakage in the bearing bush, leading to corrosion of the stator windings. Excessive oil and dust accumulation inside the motor also causes poor ventilation, resulting in high temperatures that damage the motor.
2. **Box-Type High-Voltage Motor**: This type of motor, introduced in recent years in China, offers better performance and design compared to older models like the "JS series." However, some units produced by certain manufacturers have design flaws in their bearing systems, leading to frequent bearing failures. These motors often feature an oil damper with a small gap near the bearing, intended to maintain sufficient grease. Unfortunately, this design has several drawbacks: it hinders heat dissipation and grease circulation, causing temperature rise and reduced grease performance. Additionally, the oil damper prevents proper inspection during minor maintenance, and cleaning becomes difficult during major overhauls, leading to unnecessary replacement and waste. Furthermore, repeated removal of the oil damper can cause it to loosen and escape during operation, leading to malfunctions.
3. **Double-Bearing Motor**: Some Chinese-made medium-sized motors use a double-bearing structure on the load side, increasing radial load capacity but complicating maintenance. During overhaul, bearings cannot be cleaned or inspected properly and must be replaced, increasing costs. Moreover, these motors tend to run hotter, shortening bearing life and increasing failure risks.
4. **Bearing Accessory Design Issues**: Most domestic motors use internal and external oil caps, which have poor sealing performance. This allows dust to enter the bearing, accelerating wear and reducing service life. The lack of effective cooling and grease circulation further raises operating temperatures, leading to early failure. In contrast, imported motors typically use dual-sealing devices on both sides of the bearing, ensuring cleanliness. They also incorporate cooling and positioning systems outside the bearing, providing a larger oil chamber space that significantly reduces operating temperatures and improves lubrication, thereby extending bearing life.
5. **Bearing Selection Problems**: Our analysis shows that bearing failure is closely related to improper selection. Domestic medium-sized motors often use "medium roller bearings" on the load side, which have higher radial load capacity than required but lower allowable rotational speeds than the actual motor speed, resulting in shorter service life. In contrast, imported motors typically use larger "light ball bearings" on the load side and smaller "light roller bearings" on the no-load side, balancing load capacity and speed, allowing the bearings to reach or exceed their expected lifespan.
**Transformation Process and Method**:
After analyzing these issues, our factory has been performing motor bearing upgrades for many years, achieving excellent results. Since its establishment in 1958, we began addressing the problems of "end-cap sliding bearing" motors in the early 1970s, gaining valuable experience. In the 1980s, after introducing imported boilers and auxiliary equipment, we conducted multiple overhauls and observed the advantages of the imported motor's bearing design. We then adapted these designs to fit the structure of domestically produced motors.
During the transformation process, we first evaluated bearing selection and identified the existing issues. Bearings were recalculated, redesigned, and selected based on the motor’s actual dimensions. We adopted the bearing and accessory structure of imported motors as much as possible. After implementing these changes, the bearing life was more than doubled, significantly reducing the frequency of bearing failures and ensuring the safe and stable operation of the unit.
Modular Cleanroom Wall Panel Materials
Haochen Clean Technology is committed to the intelligent manufacturing of clean panels for modular cleanroom enclosure systems in China. With rich product application and service experience, Haochen Intelligent Manufacturing provides customers with more valuable clean enclosure system application solutions.
Jilin HaoChen cleaning Engineering Technology Co., Ltd. is a technological innovation enterprise focusing on the pharmaceutical purification engineering industry. The enterprise has a superb purification engineering technical team and excellent construction force. The company has always pursued the service tenet of "safety first, quality-oriented, customer first and technology first". Many representative air purification projects have been established in Jilin Province, Heilongjiang Province, Liaoning Province and Inner Mongolia Autonomous Region. With a registered capital of 5.8 million yuan, the company has grade II qualification for professional contracting of Building Decoration Engineering; Grade II qualification for professional contracting of building electromechanical installation engineering.
Modular Cleanroom Wall Panel Materials,Polystyrene Sheets Wickes,Electroplated Steel,Rock Wool Rockboard
Jilin HaoChen cleaning Engineering Technology Co., Ltd , https://www.hcaircare.com