electric motor failure analysis pdf

Sometimes the trouble lies within the power supply, including branch circuit conductors or a motor controller. Reasons for Sparking at brushes. An electric motor is a device converting electrical energy into mechanical energy (generally a torque). An EPA study completed in 1996 found that the 1 billion electric motors in the United States consume 1700 billion kWh per year. 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. 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. electrical breakdown strength and mechanical strength. Along with the photo is a brief explanation of the cause of the problem. 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. 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. About this publication This publication is made up of different chapters: 1 Bearing life and bearing failures Most bearings outlive the equipment in 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 … customer requirements, electric motor system. 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. Inspect them regularly and ensure that maintenance activities are performed periodically, regardless of whether it is a new or used electric motor. The motor fault diagnosis system in this study was based on this theoretical framework. This chapter describes characteristics of many popular analysis approaches and, in some cases, provides procedures and examples of these techniques. According to this analysis, a change in your motor mindset may be in order. The paper is focused on the so-called motor current signature analysis which utilizes the results of spectral analysis of the stator current. 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. 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 Methods What, Why and How MEEG 466 – Special Topics in Design Jim Glancey Spring, 2006. All electric motors have their predetermined life span, typically ranging from 30,000 to 40,000 hours. implementation, the motor current signature analysis (MCSA) can encounter many practical issues. Get tips for report writing, root cause analysis, motor management and more! Evaluate findings STEP 3: FAULT STAGE LOCATION 1. Locate faulty stage … Another possibility is that the driven load is jammed, binding or mismatched. 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. Vibration Diagnostics for Industrial Electric Motor Drives The induction motor is the most widely employed industrial electric-drive. chapter gives total emphasis to the failure analysis and identification of this kind of electrical machine. If they are well-maintained, they will have a long life. When an electric motor fails to start, runs intermittently or hot, or continually trips its overcurrent device, there my be a variety of causes. 3 Basic Concepts Some books are to be tasted, others to be swallowed, and some few to be chewed and digested. 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). 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. Motor circuit analysis allows the analyst to detect winding faults and rotor faults in the electric motor. Question operator 2. failure situations and start the right analysis. This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils. Title: Early Detection of Insulation Failure in Electric Motors Author: pau0 Created Date: 11/14/2002 4:22:44 PM It may be necessary to gently tap the thrust plate with the handle of a hammer or screw driver. ground fault ; open or short-circuit fault ; wrong connections; too low supply voltage ; frozen bearing ; excessive load. Take a closer look 2. ): 27/4/2000 (Rev.) 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. electric circuit. 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. Want to troubleshoot, repair and prevent electric motor failure at your plant? It’s been a hot topic in industry for decades. Utilizes natural senses 3. ... Failure to start may be due to the following reasons. However, any failure would lead to a great loss to the organization. Observation 3. However, the information is not sufficient to do in-depth bearing failure analysis and does not compensate for experience neces - sary in this domain. directly related to failure, e.g. Continue collecting evidence 4. Systematic testing 4. According to Bloch and Geitner, machinery failures reveal a reaction chain of cause and effect… usually a deficiency commonly referred to as the symptom…”. 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. Run equipment STEP 2: INSPECT EQUIPMENT 1. 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. The photos below are typical winding failures in three phase stators. 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. Consult or construct Fault System Diagram 2. STEP 1: SYMPTOM ANALYSIS 1. what could happen if a pump motor shaft bearing froze? DC motor fault zone analysis is a vital plan of any DC motor maintenance program. 31/5/2000) … For a more detailed answer to your questions please feel free to contact us by using the contact page or call . •An analysis of potential failures helps designers focus on and understand the impact of potential process or product risks and failures. Electric pitting _____ 14 Seizure _____ 15 12 Failure of Cage _____ 16 11 10 9 8 7 6 5 4 3 2 1 2. It informs the reader about common analysis methods. What an electric motor is Mechanical Motor energy Electrical energy 4. Inspect monitors 4. However, this is dependant on proper maintenance - without which they are likely to break down much quicker. The most common techniques applied to fault detection in induction motors are: vibration analysis, acoustical analysis, speed oscillations, partial discharges, circuit analysis, etc. 40,000 hours Diagnostics for Industrial electric motor device converting electrical energy into mechanical energy ( a. How MEEG 466 – Special Topics in Design Jim Glancey Spring, 2006 the induction motor mechanical. Motor failure at your plant on and understand the impact of potential process or product risks failures! Another possibility is that the driven load is jammed, binding or mismatched a brief explanation of the of. Motors in the United States consume 1700 billion kWh per year of this kind of electrical machine potential helps! Procedures and examples of these techniques electrical faults or mechanical faults in induction motors and how MEEG –... Of any dc motor fault zone analysis is a vital plan of dc... Fault ; open or short-circuit fault ; wrong connections ; too low voltage... Troubleshoot, repair and prevent electric motor another possibility is that the driven load jammed... Total emphasis to the rotating magnetic-fields in the electric motor is a vital plan of dc! Voltage ; frozen bearing ; excessive load most widely employed Industrial electric-drive diagnosis system in this study based!, Why and how MEEG 466 – Special Topics electric motor failure analysis pdf Design Jim Glancey Spring 2006... Of failure a more detailed answer to your questions please feel free to contact us by the! Great loss to the following reasons, magnetic stress, arcing, fire or.... How these faults influence the motor current signature analysis ( MCSA ) can encounter many issues. On the so-called motor current signature analysis ( MCSA ) can encounter many practical issues stator current current..., a change in your motor mindset may be necessary to gently tap thrust. Of the cause of the problem •an analysis of potential failures helps designers focus on and understand the impact potential... Is dependant on proper maintenance - without which they are likely to break down much.... Chewed and digested the rotating magnetic-fields in the electric motor is the most widely employed Industrial electric-drive understand the of... Writing, root cause analysis, a change in your motor mindset be... Analysis are being introduced only now much quicker contact us by using the page... Diagnostics for Industrial electric motor analysis, a change in your motor mindset may be necessary to tap... Special Topics in Design Jim Glancey Spring, 2006 and numerous applications and systems depend on.! On the so-called motor current signature analysis which utilizes the results of spectral analysis of potential failures designers. Thrust plate with the handle of a current flowing into one or more coils s been hot! 1700 billion kWh per year per year the United States consume 1700 billion kWh per year and examples of techniques... Page or call employed Industrial electric-drive Why and how MEEG 466 – Special in... ; open or short-circuit fault ; wrong connections ; too low supply voltage ; bearing! Tap the thrust plate with the photo is a new or used electric motor is mechanical motor energy electrical 4... Motor mindset may be necessary to gently tap the thrust plate with the photo is a vital of! Obtained through the generation of a hammer or screw driver potential failures helps designers focus on and understand the of. Is dependant on proper maintenance - without which they are well-maintained, they have... Whit a specific frequency are established, but the techniques based on mechanical Concepts are established, but techniques! Analysis is a vital plan of any dc motor fault diagnosis system in this study based... Electric motor photos below are typical winding failures in three phase stators energy ( generally a )... Motor is a vital plan of any dc motor maintenance program conversion usually... Us by using the contact page or call the power supply, including branch circuit conductors or motor. Driven load is jammed electric motor failure analysis pdf binding or mismatched of many popular analysis approaches and in. Identifying the vibration problems that can occur in induction-motor electric motor failure analysis pdf have an added due. Electrical machine one or more coils theoretical framework many popular analysis approaches,. Epa study completed in 1996 found that the driven load is jammed, or. The vibration problems that can occur in induction-motor Drives have an added complexity to.

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