improper lubrication causes 80% of all bearing failure due to insufficient quantity, incorrect type, or improper application.
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monitoring electric motor bearing condition is paramount to insure reliability. electric motors are an asset that must be managed, and prolonging their life will insure more contribution to …
the number one reason for the removal of vertical motors from service is the failure of the bearing system. these systems can be much more complicated than those used in horizontal motors.the purpose of this paper is to present the various bearing systems used on vertical motors and the reasons why these systems can fail prematurely. suggestions will be given for extending the bearing life including how to specify these bearings and their accessories correctly. the scope of this paper includes motors up to 5000 hp, all speeds and enclosures.
discover why motor bearings fail prematurely and strategies for optimizing the lifespan and performance of your equipment.
bearing currents problems
learn more about bearing failure analysis, when it’s needed, and how to perform it to help keep your operations running and profitable.
click to learn about common motor bearing failures and the proper maintenance required to prevent your motor from damaging itself.
bearings are a critical element of electric motors. they facilitate even load handling, reduce friction, provide shaft support, and enhance the reliability and longevity of rotating components. however, without proper installation, operation, and maintenance, bearings can become damaged or fail. here, we’ll go over some of the most common causes…
the below video is a 15 minute segment of an hour long presentation given by todd hatfield of heco at the 2017 reliability, process, and maintenance (rpm) symposium. this presentation discusses common preventable causes of electric motor failures. this section of the presentation discusses bearing related failures as bearings account for about 51% of all …
a methodology for identifying the cause of failure for antifriction bearings used in electric motors is presented. an analysis of the corrective actions required to minimize or prevent reoccurrence of the problem is provided. specific tabular material on bearing temperature is supplied, and bearing failure patterns are enumerated.<
electric motors are essential to numerous plant operations, no matter the industry, so understanding how and why they fail can help you develop a better maintenance program in your plant.
vsd’s are the largest single source of bearing failures in the world today. there is a 57% increase in bearing failures worldwide, which is due to the introduction of igbt variable speed drives.
electric motor bearing maintenance good maintenance practices yield excellent service from your electric motors. up to 80% of all electric motors, regardless of size, are rebuilt because of bearing…
knowledge of common bearing failure symptoms can help you prevent damage to your machinery. this technical article provides analysis techniques and real-life examples for better understanding.
how do you know if a bearing is about to fail? bearings don’t last forever and can be damaged if proper precautions are not taken, so it’s important to know the signs of impending bearing failure. in this blog, we will go over the four stages of bearing failure and how this tends to show
bearing failures related to motors controlled by variable frequency drives vfds? the cause could be electrical discharge machining (edm).
mechanical failure is the cause of 80% of motor failures. understanding the causes behind bearing failures can prolong the life of the equipment.
the 50 failure modes of electric motors electric motors are essential to numerous plants operations, no matter the industry, which is why understanding their 50 failure modes can help you develop a better maintenance program in your plant. electric motors...
research shows that most bearing failure is due to contamination of the oil. what are some of the other common causes? read on to find out!
rolling bearings in electric motors have one failure mode which is common to this application: the problem of electric current passing through the bearings causing damage in the contact area between rolling elements and rings. the lubricant film present in the bearing provides separation between rolling elements and raceways, and the lubrication film also creates a small
the common causes of bearing failures in electric motors include electrical erosion, metal to metal contact due to a lack of lubrication and more. prime engineering are experts in repairing and replacing motor rotor shafts.
shaft currents can have a destructive effect on electric motor bearings. this article, with information from our friends at aegis shaft grounding rings, is intended to inform professionals about these voltages and their effects on bearings in electric motors. because of the high-speed switching frequencies in pwm inverters, variable frequency drives induce shaft currents in …
motor bearing failure (emoji) the rear bearing has failed causing damage to the bearing housing and melting the cooling fan from the drive shaft. also, the late
the occurrence of the motor shaft voltage and bearing current caused by the inverter will aggravate bearing damage and lead to the premature failure of bearings. many types of equipment are being shut down due to bearing currents, such as filters, insulated bearings and grounding brushes. traditional suppression measures cannot eliminate the bearing current and the bearing damage mechanism under the bearing current is not clear. in this paper, the damage caused by the bearing current to bearings is analyzed in detail. the influences of different working conditions on the bearing current and the damage caused are discussed. the source of bearing currents is introduced and the bearing current model under different working conditions is reviewed. an outlook for future studies is proposed, based on the current research status and challenges.
common causes of motor bearing failure
get the low-down on bearing failure and a handy checklist to help you identify what's up with yours, including signs to look for and proven fixes.
in modern electric equipment, especially electric vehicles, inverter control systems can lead to complex shaft voltages and bearing currents. within an electric motor, many parts have electrical failure problems, and among which bearings are the most sensitive and vulnerable components. in recent years, electrical failures in bearing have been frequently reported in electric vehicles, and the electrical failure of bearings has become a key issue that restricts the lifetime of all-electric motor-based power systems in a broader sense. the purpose of this review is to provide a comprehensive overview of the bearing premature failure in the mechanical systems exposed in an electrical environment represented by electric vehicles. the electrical environments in which bearing works including the different components and the origins of the shaft voltages and bearing currents, as well as the typical modes of electrical bearing failure including various topographical damages and lubrication failures, have been discussed. the fundamental influence mechanisms of voltage/current on the friction/ lubrication properties have been summarized and analyzed, and corresponding countermeasures have been proposed. finally, a brief introduction to the key technical flaws in the current researches will be made and the future outlook of frontier directions will be discussed.
motor bearing care
learn why bearings fail in electric motors. discover common causes, prevention tips, and solutions to extend the life and performance of your electric motors.
in this guide, we cover what bearing failure means, different types of failures, common reasons why bearings fail, and tips to prevent bearing failures
eight vertical circulating water pumps are used to circulate condenser water at the generation station in a nuclear power plant. the pump installation is pictured in figure 1. the motor pump system is arranged vertically with the drive motor above the pump. each pump is driven by a 28-pole, 2500 hp synchronous motor at 271 rpm. the motors sit on a platform that projects out over a large reservoir and each one delivers 275,000 gpm at about 12 psig. the pumps are location below the motors in the reservoir. there are four pumps per generating unit. each unit can run at full capacity drops about 10 percent. three lower motor bearing failures occurred shortly after sudden ambient temperature drops. analysis showed that there was adequate lubrication but the original bearing design was very sensitive to clearance. a finite element analysis of the motor proved that the case would pinch the bearing when cooled from 70 degrees f to 25 degrees f. this reduced the bearing clearance significantly and caused the failures. a new profiled bearing was developed that would provide better rotor support with larger clearances that would be more tolerant of thermal clearance changes. the bearing failure analysis was wide in scope and was conducted by a large team including engineers from the power plant, turbomachinery consultants, repair shops, and bearing manufacturers. many different theories were considered and investigated. this paper examines the investigations of the bearings lubrication with a computational fluid dynamics (cfd) analysis, the motor rotordynamics, the effects of ambient temperature drop, and the manufacture of a new bearing design.
bpi offers thorough bearing failure analysis to identify and address the source of bearing problems. supervisory support for bearing installation.