An electric motor is a device that converts electrical energy into mechanical energy. Regardless of the size or type of motor, it always includes two components: the motor rotor and the end cover bearing housing. The motor end cover is the main component that supports the rotor and is generally made of cast iron. Cast iron is widely used in motors due to its ease of machining and cost-effectiveness.
Common motor problems:
Wear of the motor end cover bearing housing and the motor shaft bearing seat often occurs during motor operation.
Causes of wear in the bearing housing of the motor end cover:
1. Machining errors cause clearance issues in the fit;
2. Improper disassembly and installation caused damage and wear to the bearing housing;
3. Insufficient contact surface area leads to metal fatigue;
4. Bearing damage causes wear to the bearing housing.
Repair techniques for addressing wear in the bearing housing of motor end covers:
The current solution to the wear of the bearing housing in motor end covers is mainly replacement. However, for minor wear, some companies use copper pads and polishing to quickly repair and restore production. Some machining units also use inserts, but this method is only used when spare parts for the motor end covers are unavailable.
Emergency repairs using copper pads and pitting only provide temporary relief. Under load and operation, the motor will quickly experience further wear and tear, leading to vibrations and compromised safe operation. How can this be repaired quickly?
To address wear in the motor end cover bearing, it is essential to first understand the causes of bearing housing wear and effective control measures.
The causes of metal wear are twofold: first, normal fatigue wear, which is an inherent characteristic of metals; and second, the issue of fit relationships. No matter how high the machining precision is during the manufacturing process, it is impossible to achieve 100% fit between the mating surfaces of the parts. From a microscopic perspective, the mating surfaces of metals can only achieve 30%-50% fit. Therefore, the small stress-bearing surface of the mating parts is also one of the fundamental causes of metal fatigue wear.
Solvay's new carbon nanotube polymer repair technology for motor bearing housings:
The characteristics of carbon nanotube polymer repair technology are as follows: First, this technology is fundamentally different from traditional repair processes and cannot be treated with the mindset of metals. It is a new type of application technology. Second, during motor operation, it is mainly affected by various pressures and impacts. The repair of wear by carbon nanotube polymer materials emphasizes comprehensive mechanical properties, namely the elastic deformation, toughness, and stiffness of metals. The material can withstand 1200 kg of pressure per square centimeter, which can fully meet the operating pressure and strength requirements of various shafts.
Furthermore, because carbon nanopolymers are in a paste form, they can achieve 100% surface fit after repair, avoiding gaps. Thirdly, after curing, Solvay carbon nanopolymer materials can be machined using turning, milling, planing, and grinding, and the wear dimensions of the bearing housing can be restored through various repair methods.
Case study of on-site repair of wear in motor end cover bearing housing using carbon nanotube polymer materials
Case study of repairing wear on motor end cover bearing housing using carbon nanotube polymer materials through machining.
