this article demonstrates how to detect the 13 most common causes of winding insulation and bearing failure in advance.
expert failure analysis of engines, motors, bearings, and mechanical systems by g2mt labs, including metallurgical and corrosion analysis.
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.
the use of methodologies for condition monitoring of rotating machines has been growing to reduce unplanned downtime and to increase the reliability of the industrial processes. the companies must select a correct maintenance strategy to follow the evolution of rotating machines. condition monitoring is the collection of data related to the health status of the machine and it has been widely studied so far. different methodologies have been developed to identify specific behaviors in the condition of induction motors. this paper proposes a methodology for bearing failure detection by using vibrations data, based on the frequency spectrum applied to induction motors. this methodology allows the use of vibration data obtained from motor bearings to establish their condition and therefore determine the type of damage to the bearing. the effectiveness of the proposed methodology is validated using a data set obtained from nasa (national aeronautics and space administration). the results showed that this type of approach is very useful for analyzing bearings and in this way creating maintenance routes based on the condition of the electric machines.
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.
when bearings fail, production literally grinds to a halt. keeping up with bearing maintenance is key to preventing failure, and it starts with recognizing the signs of potential problems.
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.
motor bearing care
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
this blog post discusses some of the common causes of bearing failure and some of the steps to take to avoid premature bearing failure.
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.
click to learn about common motor bearing failures and the proper maintenance required to prevent your motor from damaging itself.
sepco discussed the benefits of bearing isolators in preventing motor failure in a recent industrial trade magazine article.
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…
learn more about bearing failure analysis, when it’s needed, and how to perform it to help keep your operations running and profitable.
http://new.abb.com/events/detail/2017/07/13/customers/motors-drives-electric-motor-bearing-failure-causes-and-prevention
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
protecting motor bearings and windings is the first step in preventing motor failures. if you want to make a plant manager’s day, just say: “production’s down because a motor failed.” fortunately, such situations can usually be overcome with some relatively simple techniques and straightforward solutions to protect the bearings and stator windings. these two vulnerable…
bearings are essential components within pumps, we've listed 8 common reasons for bearing failures to look out for. if you're experiencing issues, contact us.
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
causes of electrical fluting discharge in wind turbine generator bearings and solutions.
common causes of motor bearing failure
learn about the five most common causes of motor bearing failure, according to an article by skf.
here are the five warning signs that you should look out for which indicate that it may be time to replace your bearings before failure occurs.
want to troubleshoot, repair and prevent electric motor failure at your plant? get tips for report writing, root cause analysis, motor management and more!
this article is a guide to the major factors that can lead to bearing failure as well as how you can prevent the issues from happening. by learning more about these potential problems and kn…
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...
bearing currents problems
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.
bearing failures related to motors controlled by variable frequency drives vfds? the cause could be electrical discharge machining (edm).
learn how to prevent premature bearing failures with these helpful tips from industrial electrical company. contact us for additional information.
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.
the accurate diagnosis of a bearing failure is imperative to prevent repeat failures and additional expense. rolling bearings are precision machine elements found in a wide variety of applications....