SKF: Analysis of the needs of motors and generators

Source: China Bearing Network Time: 2013-06-27

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1. Prevent current damage When stray current passes through the bearing; it can cause damage; then the raceway and the tumbling external surface will show small pits. The smoothing agent will also be affected; and the corresponding degradation will occur. Once the bearing is caused by the current passing Damage; because of noise advancement, smoothing agent efficiency, temperature rise and excessive oscillation; the service life of the bearing will be greatly shortened.
To deal with this problem; a reliable and cost-effective way is to use insulated bearings. SKF supplies a wide variety of insulated bearings; and supply engineering consulting services; to support or advocate the construction or handling of stray current problems.
2. Cut protection Motor protection usually includes smooth bearing and monitoring motor function. Smooth or make up for smoothness will lead to excessive wear; and shorten the bearing life. Bearings may even appear premature; cause operating costs A large increase. Proper sealing is an important part of the smooth function of the bearing.
The motor is equipped with a sealed and life-smooth bearing; there is no need to make up for smoothness; therefore the motor is considered to be unprotected.
3. Proper protection

SKF bearings have outstanding reliability; they can operate without problems; but in some cases require protection. In these cases; in order to maximize the reliability of the bearings and the longest service life; choose the appropriate protection methods, things and products It is very important.
3.1 Equipment and disassembly The life of the bearing depends on the environment in which it operates. However, the procedures for equipment and bearing protection have a direct impact on the service life.
There are many ways to disassemble and mount the bearings for the equipment. Mechanical methods or hydraulic pullers can be used. It is also possible to use pressure or heating. Pick the right equipment and unpack things and methods for future operations and service. The number has a crucial impact.
3.2 smooth

To achieve the best reliability; extend the lifespan; smoothness is extremely important. Grease or oil can be used as a smoothing agent. Where demand is simplified, cleanliness is improved (leakage is reduced) and pollution is improved; Should use grease. In high-speed applications; because the external heat source or the equipment itself is too high heat; so the normal operating temperature is very high; then the oil should be smooth.
4. Prevent unplanned stoppages When the condition monitoring system detects faults or early warning signals; can plan and implement corrective measures; prevent the formation of equipment failures. This will prevent costly unplanned outages. SKF also announced that it is more comprehensive Parameter monitoring method; this is the most complete, reliable and accurate equipment monitoring and analysis method.
The components and systems that can be monitored are:
â€¢ Bearings â€¢ Belt drive equipment â€¢ Gearboxes â€¢ Motors are analyzed by on-line monitoring for all-weather bearing and equipment analysis; worker safety and data consistency are at the highest level. The system includes sensors from Eternal Equipment; easy to achieve optimal supervision.
5. Reaction of speed and direction of rotation Three-phase induction motor is a powerful and protection-free treatment solution; it is the most commonly used type in industrial applications. However, in order to control the speed and direction of rotation, it is necessary to use a device that records the speed of the motor. Most of them are device differentiation instruments or decoders on induction motors to perform this function.

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INA plastic bearing noise "detection method discussion"
Analysis: The functional requirements of the motor bearing grease are correct. The device should be thrust (positioning). The bearing clearance of the bearing and the standard value of the rolling bearing should be considered.

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