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