Foreword the purpose of the nebb procedural standards for measurement of sound and vibration is to establish a uniform and systematic set of criteria for the performance of the sound and vibration testing of environmental and building operations. Home technical articles testing and commissioning procedure for electric motors. Reverse side of card at right is used to record the test data. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. Electric motor test vibration monitoring electric motor. We forget that they provide critical air flows for industrial processes, and cooling, heating, humidification and dehumidification for. Application notes vibration diagnostics for industrial electric motor drives the induction motor is the most widely employed industrial electricdrive.
We forget that they provide critical air flows for industrial processes, and. Vibration analysis of an induction motor article pdf available in journal of sound and vibration 2244. An introduction to vibration analysis theory and practice. Vibration in a motor solo run test electric motors. The existence of abnormal mechanical noises or vibrations when an electric motor is running can be a sign of internal damage.
Motor noload test shall be stopped if any abnormalities occurred which may damage the motor. Testing with the motor assembled in the past, field testing assembled ac induction motors has been somewhat of a chore. This technique along with standard vibration analysis, voltage monitoring, and temperature monitoring provides a complete diagnostic perspective of motor health and condition, power consumption, and overall efficiency. This initial survey allows us to determine quickly if the problem is in the motor or the pump, whether it is directional, the balance condition, the bearing condition, and some. Pdf some factors, such as friction, vibration, and so on, can result in the fault and. Understanding the benefits of vibration testing coleparmer.
Avoid long exposure in close proximity to machinery with high noise levels. Sales engineering department utomobiles of the 1990s face societal demands such as conserving energy. Identifying the vibration problems that can occur in inductionmotor drives have an added complexity. Procedure 3b is a general simulation test for packagedproducts shipped through a motor carrier truck delivery system, where different types of packagedproducts, often from different shippers and intended for different ultimate destinations, are mixed in the same load. This test reveals any resonancecriticalspeed problem for the entire motorbasedriven equipment system. Combined environmental testing for equipment used on. The most common method used to ch eck for shorted windings is to pe rform a drop test. 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. Initial and date the results of the following instructions and tests on attachments to this procedure. The existing swept sine wave vibration test is retained unchanged as an alternative. Pdf vibration analysis of an induction motor researchgate. How to measure vibration with the fluke 810 vibration tester.
Test to obtain more reliable values ranges of both wattmeter should be 10a, 250v for blocked rotor test. This infographic illustrates the three most important steps for a successful vibration test. General perform a vibration analysis on all motor driven equipment listed below after it is installed. Measurement tasks that took hours only two decades ago. Figure 4typical record of insulation resistance of a mill motor. During the test, check the motor for excessive vibration or temperature. Seiichi matsushige, toyota motor corporation, life test method for soldering of. A simple electric motor test like vibration monitoring can pinpoint a faulty bearing before it fails, preventing a chain reaction that could result in the failed bearing propelling the rotor to strike the winding, thus crippling the entire system indefinitely. Verify tightness of accessible bolted electrical connections by calibrated torquewrench. Test common faults and failures unchecked machine vibration can accelerate rates of wear i. Be sure the motor shaft key is captive before the motor is energized. Dc motor fault zone analysis is a vital part of any dc motor maintenance program. In the world of mechanical maintenance, vibration remains. Motor current infrared thermography 45% vibration analysis.
Test results of motor starter equipment shall be in accordance with. Similarly the range of ammeter and voltmeter during blocked rotor test, 10a, 250v. Sound intensity method in the application of motor noise. Pdf an analysis of vibration and acoustic noise of bldc. Vibration testing is an essential step in determining how your product will operate in its intended environment. The vibration level determined in the first test should be plotted versus the amount of unbalance and versus speed for the second test. The acceptance criteria shall be based on supplier approved motor routine testing procedure, but normally the calculated losses shall be less than of 110% of the theoretical loss. Pdf motor noise and vibration test research researchgate. Ieee standard test procedure for polyphase induction motors and generators 3 park avenue, new york, ny 100165997, usa ieee power engineering society sponsored by the electric machinery committee 4 november 2004 print. Vibration stabilizes at 35micrometers after motor running temp is. Vibration analysis helps diagnose the most common faults that rotating machines are susceptible to. Therefore, various parameters of the test, the test environment, the instrumentation setup, instrumentation calibration, data collection, data reduction and data analysis are extremely critical to conducting a viable test program. If the machine vibration or noise is higher, this value will increase.
Standard 851980, ieee test procedure for airborne sound. A standard vibration test method for qualification osti. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. How to select correct measurement locations on a machine fluke corporation. Testing and commissioning procedure for electric motors eep. It includes the test equipment we use, the test condition, and the test procedure we take. A random vibration test, on the other hand, excites all the frequencies in a defined spectrum at any given time. Test procedures international safe transit association. The theory and procedures of modal testing are described in.
Transportation vibration measurement free trade agreements have been on the rise in all regions of the world in the past decade. Use the hanning window for normal vibration monitoring frequency use the flat top window for calibration and accuracy amplitude use the uniform window for bump testing and resonance checks no window. Its essential that maintenance teams focus on failure modes in order to match the most suitable tool to the most likely problems. Dynamic response at vibration test points can be measured on new installations to assist in establishing standards for absolute vibrations. Multiplefunction screening tools employ algorithms that can spot flaws earlier, providing methods to share digital results with team members. Electric motor noise and vibration testing mawdsleys. Home technical articles testing and commissioning procedure for electric motors scope of motor testing it should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. There are a lot of tests for electric motors, many dependent on the size of the motor. All safety materials and equipment warning signs, barricades, fire extinguisher, etc.
The former translates position, speed, or force acceleration or torque commands to the signals needed to move the motor. Large changes in vibration level caused by small changes in speed indicate resonant condition in the support structure. The limits apply to a motor mounted on a seismic mass, and uncoupled or coupled to a piece of equipment in a way that eliminates any vibration in the driven equipment. This document describes how we conduct the environment conditions and test procedure. For instance, pretty much no one tests a 100hp or smaller motor on a dynamometer unless its a very, very special motor. Inspection and test procedures for rotating machinery. Induction motor testing routine testing or fat test.
How to measure vibration with the fluke 810 vibration. Vibration testing and dynamic analysis vibration testing of existing pump system to establish natural frequencies dynamic vibration analysis fea utilized to guide shafting and motor criteria to minimize potential for resonance validation dynamic analysis for selected equipment confirmed acceptable. There are only bearings on the motor, meaning the pump or fan is mounted. Vibration problems can vary from a mere nuisance to an indication of imminent motor failure. Test methods with the motor disassembled involve physical contact directly on the rotor. A schematic diagram of the experimental setup is shown in. Transportation vibration measurement astm international. Figure 3typical scale on the megger insulation tester. Is there any special procedure for vertical motor solo run test. In the environmental laboratory, vibration testing is per formed as part of a companys quality assurance programme together with for example temperature and humidity tests to ensure product reliability. This sae test procedure document describes the simultaneous vibration and. Vibration analysis has been around for a while and identifies rotor bar defect through high frequency fft analysis of the mechanical.
Inspection and test procedures for rotating machinery, synchronous motors and generators. More stringent specifications regarding motor vibration call for maximum velocity levels of 0. A structural vibration test on a new design is the. The theory and procedures of modal testing are described in detail by ewins. Combined environmental testing for equipment used on automobiles overview and test approach jyuro izumi espec corp. Beginning vibration analysis connection technology center, inc. There are few standard procedures and many deficiencies in test. Inspection and test procedures for rotating machinery, mynchronous motors and generators consist of visual and mechanical inspection, electrical tests. The complete guide to electrical insulation testing. Quite often we view the fans and motors that we rely on as very common machines.
Ieee std 1122004, ieee standard test procedure for. To obtain short circuit current and its power factor angle, block rotor test is performed on the motor. Application notes vibration diagnostics for industrial. Three steps for successful vibration testing element.
Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. Motor vibration is mainly induced from stator, especially from teeth excited by. Also included is a testing procedure to determine the nature and origin of the noise so that it can be treated in the proper. Work permit shall be prepared prior to start any activities. The rate at which a motor moves is dependent on the signal that drives the motor. Countries such as mexico, china, india, malaysia, even vietnam are now regularly. Rotor testing with mce pdma a leader in electric motor. Vibration screening devices provide quick feedback of equipment condition a single number for overall vibration to understand whether there is a problem, instead of analyzing vibration indepth with a spectrum. Vibration and thermal cycling test part1 unece wiki. The procedure to acquire the required data and balance the rotor is as follows. Find vibration motor test related suppliers, manufacturers, products and specifications on globalspec a trusted source of vibration motor test information.
When the motor is coupled to equipment, ensure that system vibrations are within acceptable limit per iso 108161. The overspeed test is performed to make sure that rotor speed can reach to the 1. The test object is exposed to a certain vibration level according to a procedure specified by national and internatrionai standards. A brief tutorial on machine vibration by victor wowk, p. A motor needs to be given electrical power to turn the motor. Sinusoidal vibration tests are not as helpful as random testing, because a sine test focusses upon a single frequency at any one time. Fundamentals of vibration measurement and analysis. In this test an ac voltage, normally 110 volts, is applied to the field leads. Top 5 thermal inspection points on an electrical motor discovering energy waste. Measuring fan and motor vibration connection technology center. It is good practice to completely understand the reason for conducting the test. Fundamentals of vibration measurement and analysis explained thanks to peter brown for this article.
252 1252 898 728 811 46 715 1557 1411 1221 720 218 1144 1053 931 201 550 1208 1266 70 596 639 1186 956 837 1490 1471 130 1282 157 1536 217 1155 1363 1293 654 336 228 1384 248 1215