Roughly 30 million new electric motors are sold each year for industrial purposes, some 300. Buy electric motors workshop practice s 2nd revised edition by cox, jim isbn. Member asae asae asae asae abstract large quantities of electric power are used by electric motors in the production and processing of food, feed, and fiber. There are a few very often mentioned standards like the ieee43 and ieee95.
Onsite electric motor testing onsite electric motor. Electric motors in the home workshop october 1996 edition. The energy efficiency certification requirements for the electrical motor products vary from country to country and are summarised here. Test methods for determining the impact of motor condition on. Whitelegg began manufacturing coil winding machines and accessories in 1940. An electric motor emotor test stand also referred to as bench is a test stand for reproducible testing of electric motors.
This recommended practice also defines certification and test reporting. In practice, the important point to be borne in mind is that unless an exotic cooling. Ieee 1668 recommended practice workshop final ieee section. There are a lot of tests for electric motors, many dependent on the size of the motor. The brushes on some brush type motors may not be replaceable and the tool may need to be discarded. Electric motor shop facilities,motor testing,balancing. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors.
A motor placed in storage may or may not work, regardless of its physical appearance. This test can be done in your own workshop using simple hand tools and a specialized electric testing device. However, there are other applicable standards worth knowing about where the mcemax technology can be utilized to assist in verifying motor acceptability to the standard. Safety 9 report accidents such as spells, burns, cuts or injuries to the teacher immediately wear safety shoes while working in a workshop. Always unplug motors when testing and use insulated gloves and electricians gloves. Guide for the use of electric motor testing methods based on iec 6003421 p ll determined from residual loss 8. Ieee std 1122004, ieee standard test procedure for.
In addition to the mechanical design, an electric motor test stand consists of accompanying measurement devices, sensors and application software. The first 12 are specific free practice exams and the last one below is general to all areas. This article discusses the financial impact of motor condition on electric motor efficiency and reliability by. Event sponsored by ieee and the electric power research institute. Guidelines on application, maintenance, cleaning, and testing of motors. For instance, pretty much no one tests a 100hp or smaller motor on a dynamometer unless its a very, very special motor.
The menzel load test field is the second test facility at the berlin location. Smoking, eating or drinking are not permitted in labs and workshops keep the workshop clean and tidy at all times keep the workshop floor dry keep your tools and work area organized. Mar 29, 2019 check that the windings are not open or blown. Electric motor repair equipment whitelegg machines. This electric motor repair course is designed to provide the student with practical information for winding. Jul 01, 2015 basic motor testing with multimeters and ammeters july 1, 2015 by david herres 12 comments when an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. To ensure the electrical motor condition is good or not,we must know how to testing it. Argus workshop practice series publications an excellent. Conduct testing of electrical installation must be performed on a real existing installation like wiring in the college building.
This course covers the operation and maintenance of ac and dc motors, including 3phase, dual voltage and multiple speed motors. A practical guide to methods of utilizing readily available electric motors in typical small workshop applications. This new 20,000 square foot facility, along with our additional equipment acquisitions has enabled ems to handle larger motors and further enhance the efficiency. How to check an electric motor if it is bad hunker. Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses. However, there are other applicable standards worth knowing about where the mcemax technology can be utilized to assist in. Electric motor testing proactive predictive maintenance. Measuaring motor insulation using hi pot tester electrical. Hunker may earn compensation through affiliate links in this story. Inman electric motors runs all motors through,000 horsepower at full rated voltage. Alltest pro offers consulting services, as well as advanced online and onsite training programs by technical experts accredited by smrp and iacet for motor testing and predictive maintenance that enable our customers to diagnose rotating equipment faults and maintain crucial machinery. Ac electric motors best practice lifetime reliability solutions. Electric motors have had a reputation for being a mix of science and magic.
Many simple across the line singlephase and 3phase motors used in household appliances and industry respectively can be checked simply by changing the range of the ohm meter to the lowest offered r x 1, zeroing the meter again, and measuring the resistance between the leads of the motor. Worksheets practical worksheets, for use under supervision in the workshop, are included in a separate book as a pdf or printing. Sandals or slippers are not allowed in workshops keep your lab bench organized and. Internet archive bookreader workshop practice series. 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.
Synchronous motors and generators procedures index 1. Depending on the specific application and issue, megger testing, voltage drop testing, and core loss testing, among others, can be critical for ensuring optimal motor functioning and longevity. Perform special tests such as airgap spacing and machine alignment. Electric motors workshop electric motor electrodynamics. The purpose of this guide is to inform on new standards for electric motors that will facilitate trade of high efficient motors across the globe. As a critical element of most systems, industrial electric motors cannot always easily be packed up and shipped for testing, maintenance and repair. When we need to evaluate the motor condition,hipot tester or high potential tester is the common equipment are used. To learn about the other tests renown electric conducts on electrical motors, download our new ebook, the basics of motor testing. Motor circuit evaluation reliability testing services, inc. The literature indicates many individuals responsible for the selection and application of motors have a limited knowledge of motor performance characteristics specifically, efficiency and power factor. Ieee std 1122004, ieee standard test procedure for polyphase. Cox all types ofelectric motors for workshop use are described principles, characteristics, operation, installation, speed control, braking etc. This is about the easiest book you will find to read on electric motors and devices such as rotary phase converters, static phase converters, and variable frequency drives. A practical guide to methods of utilizing readily available electric motors in typical small workshop applications workshop practice series cox, jim on.
Direct link workshop practice series 16 electric motors. Everyday low prices and free delivery on eligible orders. Electric motors in the home workshop workshop practice. Here, a team of experts carries out tests up to 1800 kw under load and up to 0 kw with no load in accordance with the latest state of technology. As we know,a multimeter or ohm meter reading only can determine if a motor winding is open or shorted but cannot checked winding insulation condition if shorted with ground or phase. Electric motor testing electrical engineering centre. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. Easa, recommended practice for the repair of electrical apparatus, easa ar1001998, electrical apparatus service association, st. Electric motors and drives fundamentals, types and applications third edition austin hughes senior fellow, school of electronic and electrical engineering, university of leeds amsterdam boston heidelberg london new york oxford paris san diego san francisco singapore sydney tokyo newnes is an imprint of. Formerly called a standard, this document describes record keeping, tests.
Integrated power services, or ips, is the leading provider of electric motor and generator repair services in north america. The bus systems used to control and monitor the test objects are also included in the test stand. 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. Dc shunt motor theory quiz questions electrician practice tests. If you want to learn more about best practice machinery maintenance, or world. It very important device to made production smoothly. Wire inserting tools in 10 tongue sizes, from 3 12mm. Electric motor testing manufacturers, service companies and distributors are listed in this trusted and comprehensive vertical portal. Scribd is the worlds largest social reading and publishing site. Knowledge of the basics together with powerful new test equipment vastly simplifies the job.
Basic motor tests include shorting between the windings, capacitor testing, test for winding resistance, insulation tests, and test of power consumption, he said. The aim of this section is to provide clarity on the removal of seals for testing to ensure uniformity of practice around the world. Headquartered in greenville, sc, with locations coast to coast, we offer inshop repair services, field services and distribution to over 4,000 customers working in continuous process, assetintensive industries. Measuaring motor insulation using hi pot tester 28012012 by lemau 1 comment when we need to evaluate the motor condition, hipot tester or high potential tester is the common equipment are used. Take one of our 12 free 2019 ase practice tests below to see what type of questions appear on an ase auto mechanic certification exam. Hioki usa sales engineer bob damico said the company markets power analyzers, insulation testers and dmms for testing electric motors. One of the most critical capabilities of an electric motor service shop is the ability to test run repaired motors at full rated nameplate voltage. Electric motor testing explained the electricity forum. It includes the reconditioning and conversion of engines, both non. Automotive repair maintenance apprenticeshipcentral. It was set up in our specially converted test hall in 20.
When a motor fails, it is often difficult to see why it failed just by looking at it. Saf test panels for the running up of motors in the workshop. So when a motor fails to operate it may not be obvious what the problem is. Only downside is its british so it assumes the line voltage is 230vac. Touch one lead to each motor power lead and the other to the metal motor casing. Published october 1996 by transatlantic publications. Motor testing at rated voltage ensures reliability. If you have a dc motor that is malfunctioning or drawing and bleeding power through the wires, there are tests that can be done to test the efficacy of the dc motor. Electric motors objectives after studying this unit, the student will be able to state the purpose of an electric motor.
All the books in this workshop practice are worth reading. Designconstruction related features in ac motors that lead to longer service life and. How to check an electric motor if it is bad by pauline gill updated july 17, 2017. Testing electric motors doesnt have to be a mystery. Select ohms resistance on the multimeter and set for the 30,000ohm range. Test for direct shorts in the motor s power windings in. Recommended interpretation of iec 6003421 external contact seals at the drive shaft extension ends shall be removed prior to testing. For each motor application, factors such as driven load, environmental conditions, power availability and performance capabilities will help determine what type of motor is the best fit for a given purpose. If you have a 3phase motor and a single splitphase power to your house, read this and discover your options. Motor circuit evaluation from raliability testing services, inc. To enhance student understanding of these concepts, two motor testing.
Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. Jul 06, 2016 testing electric motors doesnt have to be a mystery. The snell group is a leader in electric motor testing emt using portable, computersupported test equipment to monitor and trend the condition of electric motors and supporting circuitry to reveal a widerange of hidden problems. Electric motor testing 07012011 by lemau 15 comments electrical motor is the common used in industry all over the world. An auto mechanic can get certified by taking the automotive service excellence ase exams, covering fourteen different subject areas, such as diesel and gas engines. Facilities committed to better serving our customers, increasing our capabilities and extending our geographic coverage within the southeast region, we have completed a major expansion of our wake forest, nc facility. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to. Electric motors workshop free download as powerpoint presentation. This established a link with the manufacture and repair of electric motors and over the years whitelegg have consistently added to their range of equipment to mirror the changes in technology and customers requirements. Electric motors in the home workshop a practical guide to methods of utilizing readily available electric motors in typical small workshop applications workshop practice series, no 24 by jim cox.
It is alltest pros mission to design and deliver a comprehensive learning experience that incorporates theory, new technology, and practical field applications to educate attendees in the scope of motor diagnostics and comprehensive testing, including motor circuit analysis mca and electrical signature analysis esa. The authors earlier book electric motors workshop practice series no. As we know,a multimeter or ohm meter reading only can determine if a motor winding is open or shorted but cannot checked winding insulation condition. But smart companies understands is that what this means for maintenance programs is billions of dollars of lost revenue through increased motor repair costs, downtime, and waste in industrial and commercial companies. This book provides additional information about popular workshop applications for motors. When transporting a motor is economically or physically prohibitive, leppertnutmegs dedicated onsite electric motor testing and repair service is here to step in. Buy electric motors in the home workshop workshop practice by cox, jim isbn. Inspection and test procedures for rotating machinery. Information on the introduction of new testing standards, efficiency classes, labels and minimum energy performance standards meps for electric motors in global markets. A 5 hp three phase motor with a name plate fla of 25 a is used for. Jul 17, 2017 check for shorts between the power wiring and ground. Participants learn the basics of electric motors including how to maintain and troubleshoot common problems found in the workplace.
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