Analysis and Reconstruction of Bearing Problems in Medium Motors (I)

In the power plant's auxiliary equipment, electric motors serve as the primary power source, ensuring the smooth operation of the entire unit. Therefore, the losses caused by motor failures are significant, especially with medium-sized motors, which can severely impact the safety and reliability of the system. According to our analysis of motor faults, more than 60% of motor problems are attributed to bearing damage or issues caused by damaged bearings. As a result, addressing bearing-related problems in motors is a critical concern. Most medium-sized motors are designed with either "end-bearing sliding type" or "end-bearing rolling type" configurations. Based on our experience and analysis of various motor maintenance cases, we have identified several common issues: 1. **End-Bearing Sliding Type Motors**: Many of these motors exhibit signs such as overheating of the bearing bush, oil leakage, and corrosion of the stator windings. Excessive accumulation of oil and dust inside the motor leads to poor ventilation, causing high temperatures that can eventually damage the motor. 2. **Box-Type High-Voltage Motors**: These are newer models developed in China, offering improved performance and design compared to the older "JS series" motors. However, some units produced by certain manufacturers suffer from bearing-related issues. These motors feature an external oil-retaining disc placed near the bearing, which is intended to keep the grease in place. Unfortunately, this design has several drawbacks: - It hinders heat dissipation and grease circulation, leading to increased bearing temperature and reduced lubricant effectiveness. This creates a cycle of rising temperatures and eventual bearing failure. - During minor repairs, the bearing cover cannot be inspected without removing the oil-retaining disc, making it difficult to access the bearing. - Repeated maintenance can cause the oil-retaining disc to loosen from the shaft, potentially leading to detachment during operation. 3. **Double-Bearing Motors**: Some modern medium-sized motors use a double-bearing layout on the load side. While this increases radial load capacity, it also complicates maintenance. Bearings are hard to remove and inspect, requiring extra effort for replacement and increasing maintenance costs. Additionally, these motors often operate at higher temperatures, shortening bearing life and increasing the risk of failure. For more information on bearing-related topics, you may explore articles such as: - How to handle overheating in agricultural motor bearings - The standard process of rolling bearing manufacturing - The effect of cooperation between NSK bearings and lubricating oil - New techniques in motor bearing ring grinding and machining This article is sourced from China Bearing Network. For more details, visit: http://www.chinabearing.net Previous Article: Nylon Bearings and Temperature Considerations Next Article: Long-Life Bearing Devices and Adjustments

Carbon Steel Nut

Hexagon nuts (also known as finished hexagon nuts) are available in ASTM A563-A and are compatible with mild steel Bolts, such as ASTM A307, ASTM F1554 Grade 36, SAE Grade 2 and AASHTO M183. SAE Grade 5 and Grade 8 nuts are also available in finished style. Since hot-dip galvanizing usually increases the thickness of the threaded part of the fastener by 2.2 to 5 mils, the thread size of the galvanized hexagon nut is too large to compensate for the anti-corrosion coating on the bolt.
Chinese hex nut manufacturer Hongchuang Hardware provides hex nuts of various materials, such as carbon steel, stainless steel, alloy steel, titanium, etc.

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Taizhou Hongchuang Hardware Co., Ltd. , https://www.taizhouhongchuang.com