While it is normally not practical to repair small, direct current dc motors that have burned out, other motors can be repaired by rewinding. They are used in situations where large power is required. Southfair electric can use a variety of tools, testers, tracers, and sometimes compact miniature cameras to find a problem. Motor troubleshooting includes a motor connection box to practice handson skills such as troubleshooting faults in a dc motor and ac singlephase and threephase motors, evaluating dc electric motor commutator and brush health, and using a multimeter to test an ac motor startrun capacitor. Being nonstatic machines motors are subjected to electrical. Wear appropriate protective clothing and equipment. Electric motor maintenance and troubleshooting, second edition explains in detail how all types of ac and dc motors work. Discussion of motor bearing maintenance for optimizing reliability. When an electric motor is broken, one suspect is the armature with commutator of the motor. It should be less than the full load rating stamped on the nameplate.
Department of energys office of industrial technologies oit with input from trade associations, consulting companies, manufacturers, nonprofit corporations, and others. Operators are complaining that a large compressor on several occasions has failed to start. Refer to the wiring diagram to verify the motor is wired correctly. Consult your computer or terminal emulator user manual for instructions.
Below are some of the frequently asked questions regarding electric motor troubleshooting that have been answered by. Three phase induction motors are one of the most popular electric motors commonly found in processing plants or any manufacturing concern. Noise indicates motor problems but ordinarily does not cause. See the motor nameplate for proper connection diagrams. Oct 07, 2016 in this video we will present you with the full repair process of an electric motor including. Fuse or circuit breaker is tripped replace the fuse or reset the breaker. Common electric motor failure types and causes youtube.
Post a question or comment about how to troubleshoot electric motors such as air conditioning compressor motors, heating equipment burner or fan motors, swimming pool motors, water well pump motors. They provide the most surface contact since they are worn in. Chapter 9 electrical system maintenance general all electrical systems require periodic maintenance in addition to nonscheduled maintenance caused by unpredictable events such as storms, accidents, and equipment failure. Remove motor voltage and disengage the motor from the machine that it is running. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in. Downloadelectric motor repair pdf robert rosenberg.
Electrical installation, repair and troubleshooting articles. Dc motor fault zone analysis is a vital part of any dc motor maintenance program. Sizes range from cframe up through the twodigit frames 42, 48 and 56. Slide a flathead screwdriver between the bearing and the outer casing and you will find you can lift them off easily. Some standard lincoln electric motors are also capable of pws, yds or both as indicated in the following chart. The modern electric motor installation the individual motor drive has practically replaced all other types.
Remove the load from the motor and inspect the amp draw of the motor unloaded. Pry out the bearings on the top and bottom half of the ac motor one set at the front and back of each half. The intent of periodic maintenance is to keep the system operating at an acceptable level of service to the public. The above electric motor troubleshooting chart will get you down to the specific failure cause like a capacitor or a centrifugal switch, but will not get into details like electric motor troubleshooting capacitor, its self. Electric motor repair, model repair specifications for low voltage motors, and motor repair tech brief were produced by the u. Introduction to electric motor system diagnostics the reliability and energy consumption of electric motors and the systems they drive has a direct financial impact to industrial and commercial enterprises we will discuss the financial justification for a motor testing program, a general discussion of deenergized and energized. The method of repair to damaged cores shall be discussed with purchaser and. Typical inspections when troubleshooting dc motor problems or doing preventative maintenance. Motor capacitors store electrical energy for the motor to use. Always keep hands and clothing away from moving parts. Most of the electric motor failures occur at the start up.
Electric trolling motor diagnose and repair duration. No matter how urgent the problem and motor failure can cause some very urgent problems always develop a plan of attack before you start repair work. Fixing a dented fan shroud on the back of an electric motor. Dc motor analysis pdma a leader in electric motor testing.
Participants learn the basics of electric motors including how to maintain and troubleshoot common problems found in the workplace. Hatfield, vp of engineering and repair at heco all systems go, goes over common types and causes of failures in electric motors at. An imprint of the brush, signs of arcing or uneven wear indicate the need to remove the motor from service and repair or replace the rings. As with all modifications on electric or electronic equipment, make sure that you unplug. This latest edition features a new chapter on solid state control and undated technology on microprocessor controls. Electric motor troubleshooting questions about electric. Dc motor troubleshooting, inspection and learn to repair of dc motor brushes and commutators. Unit 16 electric motors washington state university. Ball bearings in motors can wear out without lubrication. Why do you think the motor needs repair it smokes, it doesnt run, it needs preventive. How to troubleshoot a 3phase electric motor hunker. Selected office of industrial us department of energy.
However, it is possible to perform electric motor troubleshooting and repair safely. Electric motors and power systems and electric motors and voltage edward cowern, p. There are, of course, two broad categories of motors, ac and dc. The basic parts of electric power tools electric power tools have many parts in common because they are built with similar electric motors. In this article we provide a diagnostic guide to determine and repair problems with electric motors. Pc line pclw310 driver c program files hewlettpackard digital imaging bin hpfccopy. Electric motor maintenance and troubleshooting, 2nd. If the motor problems cant be resolved with this list, please contact your supplier for assistance.
Implementing a predictive maintenance program takes a. Failure of this pump will result in the loss of a generator currently producing half of the stations power output. These motors usually function without many problems, but they do require maintenance and repairs at times. A motor having high lrt, such as defined by the national electrical manufacturers association nema for design c on small motors, or large motors with less exaggerated high torque curves, will normally have a large dip in torque in the 5080% speed range. Motor repair may be needed to complete electric saw repair, floor polisher repair. Reconnect motor voltage and see if the motor now runs. Maintenance and troubleshooting of electric motors reliance electric posted 11005 motor maintenance scheduled routine care. Maintenance manual chapter 9 electrical system maintenance. The frequency of routine service varies widely between applications. Most semiconductor devices can be easily damaged due to electrostaticity. Dime city cycles is the premier choice for diy custom motorcycle parts, accessories and life style gear. This course covers the operation and maintenance of ac and dc motors, including 3phase, dual voltage and multiple speed motors. Use features like bookmarks, note taking and highlighting while reading electric motor maintenance and troubleshooting, 2nd edition.
This motor is a baldor cl3509 1 hp 3450 rpm electric motor. First, disconnect all power to the motor before beginning work, including the circuit breaker. Motor and motor control troubleshooting techniques. Electric motor repair second edition 1970 by robert rosenberg and august hand and a great selection of related books, art and collectibles available now at. Electric motor repair equipment whitelegg machines. Unit 16 electric motors objectives after studying this unit, the student will be able to state the purpose of an electric motor. Praise for electronic troubleshooting the fourth edition of electronic.
A wide variety of electric motor repair tools options are available to you, there are 782 suppliers who sells electric motor repair tools on, mainly located in asia. The top countries of suppliers are china, taiwan, china, and india, from which the percentage of electric motor repair tools supply is 99%, 1%, and 1% respectively. All motors are suitable for full voltage or acrosstheline start. Whitelegg now offer an unrivalled range of equipment to the electric motor repair industry. Troubleshooting problems on your ac motor is relatively straightforward, and providing you have reasonable doityourself abilities, repairing it is not too difficult. Common causes for electric motor failure motor failure. Electric motor maintenance and troubleshooting, 2nd edition.
Electric motor maintenance and troubleshooting, 2nd edition kindle edition by hand, augie. There are also other factors which greatly affect the performance of electric motors such as low resistance, dirt, moisture, overcurrent and vibrations. Stator is shorted or went to ground motor will make a humming noise and the circuit breaker or fuse will trip check for leaks through the coils. Properly installed and maintained lincoln electric polyphase ac induction motors operated within the nameplate ratings will run troublefree for many years. Model repair specifications for low voltage induction motors. If an electric motor operates at too high a voltage, excess current flowing through the windings can cause them to become hot and burn out. Troubleshooting a small electric motor that fails is most effective when you follow a stepbystep procedure that rules out potential causes and helps isolate defective circuits or components. Working on an electric motor carries a risk of fatal electric shock. However, a patient home handyman with common sense, good tool skills, and a comprehensive book on electrical repair can do many electrical repairs safely and efficiently. Aug 21, 2012 a simple fix for your fan that doesnt start.
How to repair a small electric motor jungle explorer. Examine the motors electrical connections and terminals. Practical solutions to power quality problems for engineers and technicians practical communications and automation for electrical networks. These instruments are used to measure voltage,current, resistance. A bad motor capacitor may cause starting problems or could shut off the motor while running.
Below are some of the frequently asked questions regarding electric motor troubleshooting that have been answered by the experts. I dont miss the stress of trying to get customers motor repaired in a timely manner. The only userserviceable parts on an ac motor are the brushes and the bearings. For those looking to troubleshoot and repair their electric mower, here are some tips on a few of the most common problems. Maintenance and troubleshooting of electric motors reliance electric posted 11005 motor maintenance scheduled routine care introduction the key to minimizing motor problems is scheduled routine inspection and service. It is important to be aware of your local laws regarding electrical repairs. In this video i show how to test, dismantle, repair and reassemble a small ac motor patreon link. Remove power to the motor and repair any damaged or loose connections. How to test if a motor armature with commutator is damaged. Check the owners manual for your appliance to determine what regular. When a motor fails, it is often difficult to see why it failed just by looking at it. The higher the capacitance of the capacitor the more energy it can store. A small problem can become a big one quickly and, soon, the motor is damaged. Dec 12, 2012 breakdown causes by electric motor failures always happen in our operation due to of 2 major factors.
This design has a reduction in torque where it is needed the most. The page top photo was taken of of an oil burner electric motor not an air conditioning blower fan motor or pump motor, but youll see that all of these electric motors look a lot alike. Second, discharge the capacitors to avoid electric shock. Electric motors, gearmotors and drives site search sub motor troubleshooting chart caution. Tips for troubleshooting electric motors understanding the nuances of various motor types is essential when servicing or installing such units b y d e n n i s b u s h a fter more than 100 years of use, with an ever increasing installed base, there are probably few aspects of an electric motor s usage and failure modes. This article presents a basic explanation of electric motor construction and. Electric motor troubleshooting industrial motor training.
Armature winding1920 pdf armature winding and motor repair. Visual inspection and electrical testing of the armature and fields give the maintenance personnel an understanding of the condition of the motor. Typical instruments used for troubleshooting motor operation problems include a multimeter, clampon meter,insulation resistance meter, and infrared thermometer. If your motor is spinning, but it has recently overheated or sustained damage, you may want to dry test it to see if there are any problems with it. For more information, refer to the holt cat electrical safety. Download it once and read it on your kindle device, pc, phones or tablets. Maintain the systems components to ensure smooth, efficient operation isolate and resolve system hardware problems problem isolation. Basic electrical troubleshooting a boiler feed pump being powered by two 3500 hp inducti on motors appears to be developing a problem.
A factory can kick out a motor winding in minutes when making hundreds. How to troubleshoot an electric motor capacitor problem. It is comparatively easy to obtain the required speed through the use of motors directly connected to the driven machine, through speed reducers, or the now more economical geared motors, or even through vbelt or chain or sprocket drive. When you hire an electrician to perform an inspection on your homes electrical system, make sure these steps are covered.
Ac electric motor troubleshooting guide test procedures. It is mechanical component defect and electrical circuit failure. Motors and power systems there seems to be a lot of confusion about the voltage standards for motors and why they are structured the way they are. An electric motor is an extremely handy device which has multiple uses. This article describes ac electrical motor troubleshooting. Essential for anyone who needs to buy, install, troubleshoot, maintain, or repair small to industrialsize electric motors, this practical guide contains new information on threephase motors along with coverage of the. In many towns, there are limitations on the work an unlicensed person may do.
How to check an electric motor if it is bad hunker. Conduct a hazard assessment and follow approved safe work practices. Maintain the systems components to ensure smooth, efficient operation. Applications types of generators motor repair generator repair preventive maintenance. Verify that the motor is getting enough air for proper cooling. Most of them are caused by the overheating of motor. The types of motors applicable to this article are ac, single and threephase, squirrel cage, and induction. How to repair an electric motor that turns slow how to test ac motors. Check the source of power, overload, fuses, controls, etc. Five tips for better electric motor maintenance it is essential to perform preventive maintenance pm checks on electric motors as a part of managing facility assets because they have a massive impact on a business productivity and profit. Tips for troubleshooting electric motors understanding the nuances of various motor types is essential when servicing or installing such units b y d e n n i s b u s h a fter more than 100 years of use, with an ever increasing installed base, there are probably few aspects of an electric motors.
Maassen, erik, maintenance tips for electric motor bearings. Complete handson approach to the repair and control of ac and dc motors. Disconnect power to the motor before performing service or maintenance. Electric motor repair robert rosenberg, august hand. Whether your interest is cafe racers, bobbers, choppers, brats, trackers, scramblers or you just want something a little different for your current ride, you are sure to find the parts you need right here. An electric mower doesnt necessarily break down in the same ways as a gas powered mower, and many repair shops dont have the same expertise with electric mowers that they do gas mowers. Tests at reduced voltage may not reveal certain motor problems. Use insulated gloves, tools, blankets, and barriers if required. Before calling an electrician it is a good idea to call the power company first if you are unsure of the problem. Electric motor repair, model repair specifications for low voltage motors, and. If you have separated all the wires you can and the motor still resists spinning, you can assume you have an internal short circuit. The type of motor will determine the types of tests you will perform to troubleshoot it. The electrician should check the electric meter for defects such as insecure installation, broken meter seals and rust at the bottom of the box that could indicate the presence of water. Wipe the place where the bearings were situated using a clean cloth.
A motor placed in storage may or may not work, regardless of its physical appearance. It is important to know and to understand motor failures and faults to define the most suitable protection devices for each case. Small electric motor repair by josh weber updated july 21, 2017. Elecric motor repair by robert rosenberg goodreads. Be sure required safety guards are in place before starting. Electrical troubleshooting 1 before using a voltmeter on electrical components, do the following.
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