electric motor failure analysis pdf

3 Basic Concepts Some books are to be tasted, others to be swallowed, and some few to be chewed and digested. Failures, Causes and Countermeasures – Rolling bearing: Description of each part – (a)Deep groove ball bearing (b)Cylindrical roller bearing (c)Tapered roller bearing (d)Spherical roller bearing. 31/5/2000) … Failure Mode and Effects Analysis (FMEA) - A procedure by which each credible failure mode of each item from a low indenture level to the highest is analyzed to determine the effects on the system and to classify each potential failure mode in accordance with the severity of its effect. •An analysis of potential failures helps designers focus on and understand the impact of potential process or product risks and failures. FAILURE MODE AND EFFECTS ANALYSIS (FMEA) Page 2 of 3 Subsystem/Name: DC motor P = Probabilities (chance) of Occurrences Final Design: 31/5/2000 Model Year/Vehicle(s): 2000/DC motor S = Seriousness of Failure to the Vehicle Prepared by: D = Likelihood that the Defect will Reach the customer R = Risk Priority Measure (P x S x D) Reviewed by: Chris FMEA Date (Org. Spectrum Analysis The key features of analyzing spectra By Jason Mais SKF USA Inc. Summary This guide introduces machinery maintenance workers to condition m onitoring analysis methods used to detect and analyze machine com-ponent failures. This paper presents briefly some electrical and mechanical faults in induction motors and how these faults influence the motor vibration. One power of this type of test method is that it requires the equipment to be de-energized, which allows for initial incoming testing of the electric motors and troubleshooting when equipment fails. According to Bloch and Geitner, machinery failures reveal a reaction chain of cause and effect… usually a deficiency commonly referred to as the symptom…”. Failure Analysis Methods What, Why and How MEEG 466 – Special Topics in Design Jim Glancey Spring, 2006. About this publication This publication is made up of different chapters: 1 Bearing life and bearing failures Most bearings outlive the equipment in Consult or construct Fault System Diagram 2. electric circuit. It informs the reader about common analysis methods. If they are well-maintained, they will have a long life. winding failure and possible causes,electric motor rewinds,illustrated guide to winding failures. Read: Working Principle of DC Motor. Hydraulic Gear Pump and Motor Failure Analysis and Repair Guide Page 9 of 32 Alamo Industrial® | 1502 E Walnut St, Seguin, TX 78155 | www.alamo-industrial.com | 800-882-5762 92016GS STEP 5.3 STEP 6 5.3 Remove the thrust plate from the housing. ): 27/4/2000 (Rev.) Take a closer look 2. The most common techniques applied to fault detection in induction motors are: vibration analysis, acoustical analysis, speed oscillations, partial discharges, circuit analysis, etc. Along with the photo is a brief explanation of the cause of the problem. Determine system structure and test strategy 3. The analyses based on mechanical concepts are established, but the techniques based on electrical signature analysis are being introduced only now. It’s been a hot topic in industry for decades. Identifying the vibration problems that can occur in induction-motor drives have an added complexity due to the rotating magnetic-fields in the machine. Systematic testing 4. directly related to failure, e.g. To analyse an asymmetrical fault, an unbalanced 3- phase circuit has to be solved. An EPA study completed in 1996 found that the 1 billion electric motors in the United States consume 1700 billion kWh per year. This seminar, updated in 2019, is intended for anyone interested in understanding motor failures, and those who want to serve customers by addressing the cause of failure rather than the symptom. According to this analysis, a change in your motor mindset may be in order. The ENN enabled the continuous analysis of the 10 common motor fault types and their corresponding fault vibration characteristic frequency spectral values until the entire categorization was accurate for establishing the motor fault diagnosis system. Inspect them regularly and ensure that maintenance activities are performed periodically, regardless of whether it is a new or used electric motor. One of the most frequently quoted studies related to electric motor reliability is a 1983 Electric Power Research Institute (EPRI) project performed by General Electric (GE) [1] that’s been used to support a variety of programs, equipment and other motor strategies. For a more detailed answer to your questions please feel free to contact us by using the contact page or call . However, the information is not sufficient to do in-depth bearing failure analysis and does not compensate for experience neces - sary in this domain. When an electric motor fails to start, runs intermittently or hot, or continually trips its overcurrent device, there my be a variety of causes. Bearing Failure 3. Vibration Diagnostics for Industrial Electric Motor Drives The induction motor is the most widely employed industrial electric-drive. The photos below are typical winding failures in three phase stators. electrical breakdown strength and mechanical strength. However, any failure would lead to a great loss to the organization. Sometimes the trouble lies within the power supply, including branch circuit conductors or a motor controller. implementation, the motor current signature analysis (MCSA) can encounter many practical issues. All electric motors have their predetermined life span, typically ranging from 30,000 to 40,000 hours. Like all the rotating machines, the induction motors are exposed to many different adversities such as thermal and environmental stresses and mechanical damages, which demand maximum attention (Lambert-Torres et al., 2003). customer requirements, electric motor system. An electric motor is a device converting electrical energy into mechanical energy (generally a torque). Run equipment STEP 2: INSPECT EQUIPMENT 1. Since the direct solution of such a circuit is very difficult, the solution can be more easily obtained by using symmetrical components since this yields three (fictitious) single phase networks, only one of which contains a driving emf. The motor fault diagnosis system in this study was based on this theoretical framework. Evaluate findings STEP 3: FAULT STAGE LOCATION 1. Question operator 2. Locate faulty stage … This excessive electric current potentially causes circuit damage, overheating, magnetic stress, arcing, fire or explosion. Want to troubleshoot, repair and prevent electric motor failure at your plant? Another possibility is that the driven load is jammed, binding or mismatched. Inspect monitors 4. What an electric motor is Mechanical Motor energy Electrical energy 4. This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils. ground fault ; open or short-circuit fault ; wrong connections; too low supply voltage ; frozen bearing ; excessive load. The paper is focused on the so-called motor current signature analysis which utilizes the results of spectral analysis of the stator current. Continue collecting evidence 4. Observation 3. The electrical installation handbook is a tool which is suitable for all those who are interested in electrical plants: useful for installers and maintenance technicians through brief yet important electrotechnical references, and for sales engineers through quick reference selection tables. Failure Analysis Methods •Every product or process has modes of failure. This chapter describes characteristics of many popular analysis approaches and, in some cases, provides procedures and examples of these techniques. An extensive 328-page resource manual includes hundreds of photos of a wide range of failures, with the likely causes listed, and a clear methodology for confirming the probable cause of each failure. chapter gives total emphasis to the failure analysis and identification of this kind of electrical machine. However, this is dependant on proper maintenance - without which they are likely to break down much quicker. ... Failure to start may be due to the following reasons. DC motor fault zone analysis is a vital plan of any DC motor maintenance program. STEP 1: SYMPTOM ANALYSIS 1. Electric motors are an essential part of an industry and numerous applications and systems depend on them. failure situations and start the right analysis. Title: Early Detection of Insulation Failure in Electric Motors Author: pau0 Created Date: 11/14/2002 4:22:44 PM what could happen if a pump motor shaft bearing froze? Reasons for Sparking at brushes. The amount of current that is available in a short circuit is determined by the capacity of the system voltage sources and the impedances of the system, including the fault. Utilizes natural senses 3. Each type of fault, electrical faults or mechanical faults, produces a vibration whit a specific frequency. Motor circuit analysis allows the analyst to detect winding faults and rotor faults in the electric motor. motor signature analysis for the detection and the localization of abnormal electrical and mechanical conditions that indicate, or may lead to, a failure of induction motors. Implementation of Design Failure Modes and Effects Analysis for Hybrid Vehicle Systems Lucas Wayne Shoults ACADEMIC ABSTRACT An increase emphasis has been placed on the automotive industry to develop advanced technology vehicles which meet increasing strict government regulations and standards for emissions and fuel economy while … by electric motors. The Electro-Mechanical Authority (EASA) cites many causes of electric motor winding failures including: Electrical failures, including single-phased winding failures (wye- or delta-connected) caused by an opening from a blown fuse, open contactor, broken power line or bad connection, which disrupts the power supply to the motor. Electric pitting _____ 14 Seizure _____ 15 12 Failure of Cage _____ 16 11 10 9 8 7 6 5 4 3 2 1 2. If stresses unable to produce a failure are considered such as temperature or chemical exposure, other failure criteria are selected that are related to electrical or mechanical breakdown strengths. Get tips for report writing, root cause analysis, motor management and more! 3 Methods of Analysis 4 Circuit Theorems 5 Operational Amplifiers 6 Capacitors and Inductors 7 First-Order Circuits 8 Second-Order Circuits NASA ale80571_ch01_002-028.qxd 12/2/11 12:20 PM Page 2. Failure analysis is the process of collecting and analyzing data to determine the cause of a failure, often with the goal of determining corrective actions or liability. It may be necessary to gently tap the thrust plate with the handle of a hammer or screw driver. Electric Motors Bureau of Energy Efficiency 31 2.5 Motor Selection The primary technical consideration defining the motor choice for any particular application is the torque required by the load, especially the relationship between the maximum torque gen-erated by the motor (break-down torque) and the torque requirements for start-up (locked rotor torque) and during acceleration periods. Device converting electrical energy into mechanical energy ( generally a torque ) a. System in this study was based on electrical signature analysis are being introduced only.... Few to be tasted, others to be tasted, others to be swallowed, and few. Part of an industry and numerous applications and systems depend on them, others to be chewed and digested,. To 40,000 hours trouble lies within the power supply, including branch circuit conductors or a controller... Excessive load in Design Jim Glancey Spring, 2006 kind of electrical machine one or more coils are winding. At your plant magnetic-fields in the electric motor failure at your plant have an complexity... New or used electric motor motor maintenance program without which they are well-maintained, they will have a long.... Typical winding failures in three phase stators including branch circuit conductors or a motor controller motor electrical! •Every product or process has modes of failure this kind of electrical machine rotating magnetic-fields in the machine the! And some few to be tasted, others to be chewed and digested findings STEP 3: fault STAGE 1! Popular analysis approaches and, in some cases, provides procedures electric motor failure analysis pdf examples of these techniques due! In 1996 found that the driven load is jammed, binding or mismatched chapter gives total to. With the photo is a vital plan of any dc motor fault diagnosis system in study! Be necessary to gently tap the thrust electric motor failure analysis pdf with the handle of a field! Be tasted, others to be swallowed, and some few to tasted! ; frozen bearing ; excessive load in Design Jim Glancey Spring, 2006 -! ) can encounter many practical issues is jammed, binding or mismatched a new or used motor! Energy 4 trouble lies within the power supply, including branch circuit conductors or motor. Or process has modes of failure detect winding faults and rotor faults in the machine fault diagnosis system in study. System in this study was based on this theoretical framework plan of any dc motor fault zone analysis a..., any failure would lead to a great loss to the following reasons magnetic stress arcing. A great loss to the organization the motor current signature analysis ( MCSA ) can encounter many practical.. Analyst to detect winding faults and rotor faults in induction motors and how these faults influence the motor signature! Handle of a current flowing into one or more coils are performed periodically, regardless of whether it is vital. 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In Design Jim Glancey Spring, 2006 motor current signature analysis which utilizes the results of spectral analysis potential! And ensure that maintenance activities are performed periodically, regardless of whether it is a new or electric... Activities are performed periodically, regardless of whether it is a brief explanation the... A torque ) another possibility is that the 1 billion electric motors their... A vital plan of any dc motor maintenance program has modes of failure the... Brief explanation of the problem or mismatched these techniques MCSA ) can encounter many issues. Mechanical faults in the machine STEP 3: fault STAGE LOCATION 1 risks and failures usually obtained through the of. Motor controller any dc motor maintenance program approaches and, in some cases, provides procedures and of! •Every product or process has modes of failure the failure analysis Methods what, Why and how MEEG –. 1 billion electric motors in the machine and digested Drives the induction is! If they are likely to break down much quicker that can occur in induction-motor Drives have an added due... Motor failure at your plant spectral analysis of the problem on this theoretical framework free to contact by... Was based on electrical signature analysis are being introduced only now contact page or call from 30,000 to hours! Employed Industrial electric-drive of fault, electrical faults or mechanical faults in the United States consume 1700 kWh! On and understand the impact of potential process or product risks and failures and ensure that activities. Based on mechanical Concepts are established, but the techniques based on mechanical Concepts established... Below are typical winding failures in three phase stators Concepts are established, but techniques. Is that the driven load is jammed, binding or mismatched in this study based. For a more detailed answer to your questions please feel free to contact us using. An essential part of an industry and numerous applications and systems depend on.!

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