There are many kinds of electric motors but in general they have some similar parts. Failure to consider each of these elements of the motor system could lead to an incorrect diagnosis of the root cause of failure. These motors have high torque at low speed and low torque at high speed as shown in fig 15 due to its characteristics it is used in places where high torque is required at low speed. Be sure the motor shaft key is captive before the motor is energized. The failure modes and effects analysis fmea, also known as failure modes, effects, and criticality analysis fmeca, is a systematic method by which potential failures of a product or process design are identified, analysed and documented. This additional energy is not used to turn the motor shaft but circulates in the windings and ultimately contributes to internal energy losses. Most of them are caused by the overheating of motor. Electric motor in water pump station equipment information equipment type. Potential failure mode and effects analysis slide 14 the cove.
Until the growth of the power grid in the 1890s most people middle and low classes even in cities did not have the electric light in the home. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. The reliabilit oyf an electri motoc irs dependent upo n the reliabilit oyf its parts whic, h may include bearings. Most of the electric motor failures occur at the start up. Trolleys and the connected power systems were very expensive to build but transported millions of people to work in the 1880s. An induction motor uses the principle of electromagnetic induction to cause the rotor to turn. Fmea motor electrical engineering electromagnetism. Isbn 07389785 ss95211 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. This report presents failure modes and effects analysis fmea on permanent magnet assisted synchronous reluctance motors pmasynrms. Failure mode and effects analysis of diesel engine for ship navigation system improvement danny faturachman1, shariman mustafa2, fanny octaviany3, theresia d. Pdf failure mode and effect analysis fmea of manually. Many factors affecting the system will also affect the motor and may contribute to the motor failure and vice versa. Failure modes and risk assessment of rotary compressor under. The motor system case study within this work aims to allow the process for dfmea to be simple and easily implemented and understood when it is appropriate to start.
Definition of fmea failure mode and effects analysis fmea is a method designed to. Failure modes and effect analysis which is applied to the. Conducting a failure mode effect analysis fmea of the complete system is an effective approach. Avoid long exposure in close proximity to machinery with high noise levels. Identify and fully understand potential failure modes and their causes, and the effects of failure on the system or end users, for a given product or process.
Failure mode failure cause failure effect noisy operatio n worn or ben shaft t shaft alignmen t. Lets take a closer look at electric motor failure to examine the stresses on the motor, the most common failure modes and some of the causes of. Acronyms 8d eight disciplines of problem solving aiag automotive industry action group apqp advanced product quality planning asqc american society for quality control doe design of experiments fmea potential failure mode and effects analysis fta fault tree. Part n analysis and synthesis of an electrical motor system 4. The measurements shall be carried out with an instrument conforming to iso 2954 10 hz frequency range. Failure mode and effect analysis fmea a failure mode and effect analysis or fmea in short, is an engineering technique used to define, identify, and eliminate known andor potential failures, problems, errors, so on from the system design, process, and or service before they reach the customer.
Keywords reliability, failure modes, fmea, pc cooling fan, electric motor, bldc. Failure modes and risk assessment of rotary compressor. Mve external electric motovibrators consist of an electric motor housed in a sturdy fmeadesigned cast casing, with eccentric weights fitted on both shaft ends. Implementing an failure mode and effect analysis for small. So such motors found their application in electric locomotives, elevators, cranes, trolley cars etc. The motor pump should be broken down into more subcomponents that are likely to fail and will affect the system, such as the motors bearings and the rotor shaft. Pdf failure modes and effects analysis fmea on permanent. National renewable energy laboratory national wind technology center. After defining the model, an electric motor system for hybrid vehicle is analyzed for mechanical and inverter system risks. Testing and commissioning procedure for electric motors eep. Many factors that affect the system will also affect the motor and may contribute to the motor failure and viceversa.
Ieee std 1122004, ieee standard test procedure for polyphase. Electric motors should be installed very carefully and should be looked after at regular intervals. Rotates a number of degrees with each electric pulse. When higher loads are present, an alloyed steel such as chromiummolybenum crmo is frequently used, and for applications with extreme corrosion or hostile environment a. Motor shaft materials for most motor applications, hot rolled carbon steel is a good choice. System theoretic process analysis of electric power. How to conduct a failure modes and effects analysis fmea. The electric motor s world impact before light bulbs. Assess the risk associated with the identified failure. The rotor sits the middle most of the time, and is subject to the magnetic field created. Each motor has a stator, which may be a permanent magnet as shown in the universal motor above or wound insulted wires an electromagnet like in the photo aboveright. Yun united technologies carrier corporation co daewoo carner corporation kwangju, korea abstract under an extraordinary operating condition, any rotary compressor will eventually fail if the condition is harsh enough andor lasts long enough.
There are also other factors which greatly affect the performance of electric motors such as low resistance, dirt, moisture, overcurrent and vibrations. For bearings fitted with proximity probes, the unfiltered peaktopeak value of vibration including. Consider steam turbine drives for rotating equipment. Function mve external electric motovibrators can be used as flow aids, on hoppers or silos to improve material discharge, or as drives on vibrating machines for several purposes such as. Backed by 150 years of experience, simotics motors are unrivaled when it comes to reliability, ruggedness, compactness, efficiency, and performance.
Failure modes and effects analysis redesign headlamp circuit to produce headlamp failon, wtimed off feature to protect battery, or eliminate relayuse hd sw. Though configurations vary, the stator is most often a permanent magnet or row of magnets lining the edge of the motor casing, which is usually a round plastic drum. Dc motor p probabilities chance of occurrences final design. Mar 09, 2016 how the powertrain of an electric vehicle is modeled first in software, then elaborated using virtual hardware running target code, to enable virtual fmea with rich datagathering and analysis capabilities. Phl pha fmea fmeca classical fmea question for each system element. Common causes for electric motor failure motor failure. D likelihood that the defect will reach the customer. Failure mode and effects analysis fmea page 2 of 3 subsystemname. Introduction the fans are rotating machines used to increase the air flow by changing the mechanical energy received at the motor shaft.
Gearbox typical failure modes, detection and mitigation. System theoretic process analysis of electric power steering. Potential failure mode and effects analysis fmea fmea fmea. When a 3phase motor expirience phase failure, what a mess home technical articles when a 3phase motor expirience phase failure, what a mess a phase failure is an interruption of a single conductor. The object of fmea is to help design identified failures out of the system with the least cost in terms of time and money. The frequent use of variable frequency drives vfds is showing detrimental effects to electric motors due to the condition of power within manufacturing facilities. Often, failure modes and effects analysis fmea or reliabilitycentered maintenance rcm can serve that purpose because both technologies require intimate knowledge of how things can break down.
Uca1s2r2 additional feedback might be required to report demanded current by the motor. The fmea will be used to prevent the probability of failure for each component or subcomponent. Failure modes and risk assessment of rotary compressor under extraordinary operating conditions k. The speed of an ac motor depends on the frequency of the input power and the number of poles for which the motor is wound. The motor and system although a complete system analysis is beyond the scope of this paper, when conducting a root cause failure analysis, it is important to recognize that the motor is only one component of a system. You can then select either the motor or turbine as the prime mover by increasing or. The general system is composed by a photovoltaic panel for power supplying, the charger and the battery module, the control module and the motor part of the system. Introduction motivation increasing pressure to add more and more functionality to automobiles, e.
In this paper, ordinary fmea failure mode and effects analysis was applied during the design phase of an electric motor control system for vehicle hvac heatingventilationair conditioning. Mar 19, 2015 the motor pump should be broken down into more subcomponents that are likely to fail and will affect the system, such as the motors bearings and the rotor shaft. Motor speed relationship the synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. System theoretic process analysis of electric power steering for automotive applications by rodrigo sotomayor martinez s. Reliability centered maintenance 1 reliability of electric motor in pump station 2. Implementation of design failure modes and effects analysis. A failure mode and effect analysis fmea for a commercial. Simotics industrial electric motors provide you with the optimum solution for every application.
A comparison of stpa and automotive fmeca rodrigo sotomayor system design and management. The present paper emphasizes the fmea analysis, considering the usual faults which might occur in the running of the mentioned electric motors. Gearbox typical failure modes, detection and mitigation methods. System level validation shall ensure that electric sensors, actuators and modules do not irradiate electromagnetic noise that could cause improper behavior of modules, actuators and sensors of the system and the vehicle. Hello all, i am looking for a standard fmea for 3 phase induction ac motors and dc brushed motors. Pdf failure mode and effect analysis fmea of manually and. Steam turbine flexibility equipment redundancy and improved reliability can be obtained by mounting a steam turbine drive and an electric motor on opposite ends of the drivenequipment shaft. With the motor at normal operating temperature, the vibration velocity shall not exceed 2. Motor company that affect customer safety andor could result in noncompliance with government regulations and thus require special controls to ensure 100% compliance.
Uca1s1r3 system level validation shall ensure that electric sensors, actuators and modules signal to noise ratio remains. In electric motors, stator and rotor are aligned with. If you had a 100 hp motor and an unbalance factor of 3%, you woul d need to derate the motor to 0. Implementation of design failure modes and effects. Failure mode and effects analysis fmea approach is chosen as a risk assessment methodology in this paper to synthesize the potential failure modes and their associated causes for product design, especially in ship diesel engine. Fmea for motors fmea for motors electrocuted1 electrical op 18 jan 18 10. Electric motor threephase electric supply threephase electric supply valve or damper control steam, gas, or kerosene fuel or steam control large energy loss in throttling valve or damper.
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