Motor bearings are used to hold the shaft of the motor together. Shafts need to be properly lubricated and ground so that they can run smoothly. However, there are some common reasons for failure.
Properly lubricating motor bearings can extend the life of the motor and prevent premature wear. Proper lubrication also protects bearing surfaces and prevents rusting during idle periods.
Electric motors are constantly subjected to heat, humidity and mechanical shear. This makes it difficult to find the right lubricant for the job. However, most oil suppliers offer greases designed for high-temperature applications.
For example, polyurea-based grease is a good choice because of its high-temperature properties. It also has the added benefit of antioxidants.
There are also some other lubricants that may be useful, such as lithium greases and calcium greases. However, choosing the wrong motor can lead to premature failure of the motor.
Additionally, lubrication is a great way to protect bearings from debris and dirt. Grease also helps transfer heat from the bearings.
Proper lubrication of the motor will improve performance, reduce friction and help keep the motor running at peak efficiency. To determine the optimum lubrication interval, consult your motor manufacturer. In addition to operating hours, the type of grease as well as the size and speed of the bearing will affect how often you should lubricate.
Lubrication of the motor bearings can be done with a grease gun. Make sure the gun is filled with the proper lubricant for the job. You should always clean the area where the grease will flow before refilling.
The lubrication of the motor should be carried out in time. Failure to do so can result in excessive wear, shorted windings and increased heat generation.
If you are unsure of what is involved in proper lubrication of motor bearings, consult the Motor Lubrication Guide. These guides will tell you what you need to know and give you advice on how to maintain your motor. They usually recommend aligning the motor, keeping the shaft and windings free of small particles, and cleaning the areas where the grease will flow.
While there is no exact formula for properly lubricating motor bearings, a little practice and attention to detail will go a long way toward ensuring your motor runs at its best.
Shaft grounding device
Shaft grounding for motor bearings is used to ensure that current is diverted to ground. This prevents damage to the motor's internal components. It also helps with long-term device performance.
Electric motor bearings present many risks, including arcing, pitting and grooving. These damages increase maintenance costs and cause downtime. The shaft is particularly susceptible to these effects because it is designed to withstand high stresses.
Using a shaft grounding device for electric motors is a simple and effective way to protect this important piece of equipment. It also saves your business money in the long run by preventing parts from failing prematurely.
The shaft grounding device consists of metal rotor, brushes and non-contact isolation cover. Usually, it is mounted on the end plate of the motor. It provides an alternate path to ground, eliminating PWM waves that could damage bearings.
Shaft grounding also protects your motor from circulating currents. Often, shaft voltages can be introduced into the circuit due to electromagnetic leakage or high frequency circulating currents from variable frequency drives (VFDs).
Shaft grounding is a simple and effective method of protecting electric motors. Costly repairs and downtime can result if you don't have the right equipment. There are a variety of devices on the market today, each designed specifically to meet your needs.
Several modern advances in shaft grounding make it easier to install. However, even state-of-the-art devices still have limitations in reducing shaft currents.
Some equipment is also expensive and requires regular maintenance. Another concern is that contamination can cause loose fiber contacts. They even lose the ability to shunt current to ground.
To prevent this from happening, insulated bearings should be installed on the non-load side of the motor. Alternatively, you can use hybrid bearings.
For larger motors, a shaft grounding ring may be a better choice. This combination of isolated conductive wire loops and non-contact isolating shield eliminates PWM waves and reduces the possibility of bearing damage.
Liquid contamination in electric motor bearings can significantly affect the service life and performance of these components. Proper lubrication practices can help minimize damage from these contaminants.
While contamination is difficult to prevent, there are a number of ways to help reduce the risk of premature bearing failure. Following these recommendations can extend the life of your motor and minimize downtime.
Lubrication is an essential element in the operation of any electric motor. Lubrication prevents friction and wear by maintaining bearing and wear resistance. In addition, grease prevents dirt and other foreign matter from entering the bearings.
When choosing the right lubricant, the first step is to consider the application. Different types of grease may work better at different temperatures. Some are waterproof and will retain more oil under pressure. However, grease with too much water can cause bearings to rust.
The lubricating oil film should also be free of particles. Lubricated membrane filters capture these contaminants and help maintain membrane cleanliness. It is best to clean the grease fittings before adding new grease.
When relubricating large motors, it is important to clean the area around the grease fittings. This will ensure that no dust or solid contaminants enter the system.
Another way to prevent contamination from entering bearings is to use bearing isolators. Bearing isolators are specifically designed to prevent airborne contaminants from reaching bearings. They also reduce overall maintenance costs and increase reliability.
During installation, technicians may inadvertently introduce contaminants into motor bearings. A nitrile "slinger" can be placed on the shaft to shake off contamination.
Other ways to prevent contamination include keeping the work area clean. Brushes can collect contaminant particles, but must be cleaned regularly. Clean brushes reduce oxidation buildup that can cause mechanical wear.
Finally, periodically re-grease the bearings. Maintenance lubricants are the lifeblood of electric motor bearings. Failure to relubricate will result in damage to rotating elements and breakdown of the lubricant.
Electric motors operate under harsh conditions and are therefore susceptible to contamination. This condition can corrode the lubricant and cause premature failure of the bearing. Taking the time to understand the effects of pollutants and following these simple tips can help prevent the damage they cause.
Common failure causes
There are many factors that can cause motor bearings to fail. But these can be prevented by following a few simple steps. This article will explain the main causes of failure and how to prevent them.
Improper installation and handling can be a major cause of bearing failure. Often, these problems can be resolved with proper installation and maintenance procedures.
Another cause of bearing failure is excessive vibration. Vibration causes wear and reduces bearing life. The operating environment should be kept as cool as possible. Using a breather plug or anti-condensation heater is one way to prevent this from happening.
Overheating can also cause damage to the motor. If the temperature rises, the lubricant seeps out and the bearing degrades. Proper insulation is essential to prevent this.
Ingress of moisture can also cause corrosion of the motor. Properly installed cooling fans will help alleviate the problem. Be sure to follow the manufacturer's installation instructions.
Poor power quality is another cause of bearing failure. If you operate machinery, it is vital to check voltage and current regularly. Also, it is important to perform a vibration analysis.
Other causes of motor failure include improper lubrication and contamination. These can be caused by contaminated oil, dirt and moisture. Foreign objects in the motor can cause high levels of vibration.
Mechanical failure and overloading can also cause bearing failure. This can lead to unplanned downtime and lost revenue. To avoid this, always perform an alignment test to ensure proper positioning of the bearings.
Additionally, original equipment managers (OEMs) should consider bearing life when designing a predictive maintenance program. Accurate planning will prevent unplanned downtime and keep your operations running smoothly.
Finally, the rotor shaft of the motor should be secured. Typically, this can be done with flat steel U-bars or straps. Make sure to turn the motor regularly to avoid unnecessary damage.
It is important to determine the cause of motor failure. Performing root cause failure analysis is an effective way to deal with potential situations.