Electrical and motor machine shop safety procedures. Repair and design of electrical machines, induction motor rewinding, electric motor design. Excess current causes heat, which must be dissipated. If youve done everything properly, your motor should function like new. By performance characteristics, we mean the nameplate ratings e. Practical information and data covering winding and reconnecting procedure for direct and alternating current machines, compiled for electrical men responsible for the operation and repair of motors and generators in industrial plants and for repairmen and. Full rewinding 36slot single phase 3hp motor rpm 1440. The effect of repair rewinding on motor efficiency.
This included studying the effects of a number of variables. To rewind an electric motor, remove the motors outer housing and use your hands to pull the armature out of the stator. Hes rebuilding a small machine, of 1940s vintage, on which the motor is wound for 440v only, 3 phase, of course. Please practice handwashing and social distancing, and check out our resources for adapting to these times.
This standard is intended to be a basic or primary document that can be utilized and referenced by owners of ac motors and generators machines that need refurbishment, repair, andor rewinding, as well as service or repair facilities. Electrical and motor machine 61 electrical and motor machine shop safety procedures this section has been formulated to set guidelines for all electrical work performed by this department. Global electronic services offers a total range of machine shop and motor rewinding services for electric motors of all sizes. Reduced speed is provided down to about 50%, rated speed, but efficiency is low. This standard covers reconditioning, repair, and rewind of horizontal and vertical induction motors and of synchronous motors. Jan 15, 2016 for the purpose of this document, the term motor is used in lieu of, and shall equate to, the terms wound rotor, generator, and machine. Jul 06, 2016 the basic procedure is to measure the startup and running current for any motor while its connected to a load. Quality control requirements for calibration, materials, and documentation 4. How different burnout temperatures affect stator core losses. A text book of motor winding guide in urdu urdu books pdf.
In this instructables i will show you, how to rewind and renovate old electric single phase electric motor. Practical information and data covering winding and reconnecting procedure for direct and alternating current machines, compiled for electrical men responsible for the operation and repair of motors and generators in industrial plants and for repairmen and armature winders in electrical repair shops. At all times remember te follow correct safety procedures during the performance activity. I should mention though, that the process is rather difficult though doable and buying the stocks of wire and other materials required, wasnt cheap. Keeping motor windings dry internet version of this manual created september 2000. How different burnout temperatures affect stator core. With the motor at normal operating temperature, the vibration velocity shall not exceed 2. Leeson electric, has a threegeneration history in electric motor manufacturing. Handoperated hydraulic pump giving up to 20 tonnes power. Rewinding of motors pdf the information in this report and the good practice guide to maintain motor efficiency part 2 was. Use of the star of slots in designing fractionalslot singlelayer synchronous motors. Once youve successfully rewound your motor, reinsert the armature into the stator and fit both pieces back into the motor housing. Alternating current ac and direct current dc motors employ an insulated, currentcarrying coil essential to their operation. The newly rewound coil is warmed in an oven, immersed in an epoxy varnish and baked in an oven at a temperature of 300 degrees fahrenheit for at least four hours.
In its simplest form, the threephase, random wound stator winding process consists of removing an existing winding from a stator and replacing it with a winding that duplicates the original winding performance characteristics. Here are some of the things a designer needs to know in order to make an accurate winding calculation. Learn the basics of electromagnetic induction, motor selection criteria and proper maintenance techniques. Hello everyone, i am niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor. Pdf the paper unifies previous experiences related to the motor rewinding. Apr 14, 2018 full rewinding 36slot single phase 3hp motor rpm 1440. Electric motor fundamentals free online training program this is a free online training program aiming to enhance your motor knowledge. Electric motor repair equipment whitelegg machines. We maintain the highest safety standards and with qualified professionals. As motors age, the current drawn generally rises because winding insulation resistance drops. Chuck yung easa senior technical support specialist when rewinding field coils, there are a couple of common problems that make life difficult for the service center. How to calculate winding data of a motor for particular hp.
Please practice handwashing and social distancing, and. Electric motor rewinding and rebuilding tutorial global. A fulltime writer since 2006, david dunning is a professional. It applies to all voltages 15 kv and less, and all ratings above 0. Most of the time we glance at the user manual once, and then we put that little booklet away in order that we are able to still find it easily whenever we have to have it. Glossary sections 14 are part of the package that accompanies the motor to the service center. Improves power factor of the motor resulting in lesser current drawn and reduced cable losses key points to remember. Model repair specifications for low voltage induction motors. Troubleshooting with insulation resistance test instruments.
The traditional method for motor rewinding involves removing the old coil, winding a new coil and varnishing. Once these details are recorded the damaged windings are carefully removed and check for the details such as no of turns per slots, the gauge of the conductor. Ac singlephase motors part 1 centrifugal switcha switch used to disconnect the start windings in a splitphase motor after the. An electric motor is an electrical apparatus that converts electrical activity into automated energy. Aemteasa rewind study and good practice guide illustrates that when performed properly, electric motor repairrewind does not degrade efficiency. Extraction height adjustable by hand crank operated rack and pinion. Electric motors are relatively simple mechanical devices, but rewinding them isntin fact, its one project thats usually best left. This standard specification describes the requirements for the contractor to overhaul ashore in a suitable repair facility an alternating current ac induction or synchronous motor removed from a coast guard vessel. During rewinding process, efficiency gets reduced by reducing number of turns from the winding specification. Motor repair form for purchaser to describe the motor s condition, operating environment, and desired service 5. When rewinding, the new insulation should be given special impregnation, for humid climates, which is. Follow these procedures to reduce problems when rewinding. Motor rewinding procedure pdf pages 1 6 text version. Commercially, this is done by baking the stationary part of a motor in an oven at 650 degrees fahrenheit for several hours.
A guide to maintenance practices for small horsepower vering construction control and maintenance, including armature winding. Armature winding1920pdf armature winding and motor repair. An insulation multimeter can be used to check insulation integrity between commutator segments prior to rewinding. Nov 10, 2017 motor rewinding procedure pdf motor rewinding diagram electrical principles guide. Get motor rewinding procedure pdf file for free from our online library pdf file. This is the story about how i did just that and how you can do it too.
Old coils are removed by heating the stationary part of the motor stator in an oven. Connect a megohmmeter to measure the resistance of each winding lead to ground. A general mathematical formulation for winding layout. Abb training abb service for motors and generators. This can be accomplished by connecting reactors of the proper design across the motor starter contacts so that when the contacts are open the motor remains energized, but at a very. The purpose of this manual is to provide direction and to the greatest extent possible, to assure a safe work environment for all electrical employees. The classification of motors can be done with considerations like the. Rewinding motors with no specific controls on stripping and rewind procedures. With our online resources, you can find motor rewinding procedure or just about anytype of ebooks, for any type of product. Electrical motor rewinding procedure steps before the commencement of rewinding it is important to note the nameplate data and the connection of winding pattern of the machine. Jan 04, 2017 electrical motor rewinding procedure steps before the commencement of rewinding it is important to note the nameplate data and the connection of winding pattern of the machine. Compare the reading to documented or nameplate specifications.
Unless you are experienced, having a professional perform the task will save you money and headache in the long run. Rewinding an electric motor is a tedious and difficult procedure. I wonder if motor shops even make money on rewinding motors. The motor for any application should not be oversized or undersized. Removal old coils are removed by heating the stationary part of the motor stator in an oven. Priest electric is a reliable service provider trained in electric motor rewinding in boise, idaho, nevada, and oregon. Vaezzadeh and hendi 2005 presented an online optimization controller for induction motor drives for smooth system performance and. Shown at left is a motor from the early 1900s,made by st. Read online now motor rewinding procedure ebook pdf at our library. Were an industryleading partner, focused on getting your motor back up and running so your operations can minimize downtime and get back to profitability.
If you are searching for rewinding of one phase motor you can find it here. Electric motor repair and rewind we are the only company in the sydney eastern suburbs repairing and rewinding electrical motors of all sizes for industrial and marine industry. Testing and commissioning procedure for electric motors eep. One problem occurs when the newly rewound set of shunt fields is returned to the service center, roasted again. Electrical induction motor winding design software just about everything that you just find or searching incorporates electrical induction motor winding design software. Our rewinding and remanufacturing procedures are fast, efficient and employ the latest available testing equipment, while using only the highest quality.
The effect of repairrewinding on motor efficiency iecex. Jan 31, 2015 help diploma of associate engineering d. The new windings are wound on a coil winding machine, under the supervision of a technician, who controls the tension, layering and number. Comprehensive guide to electrical motor rewinding process. Best of all, they are entirely free to find, use and download, so there is no cost or stress at all. It has been developed for the petroleum, chemical, and process industries, and it may be adapted to other areas of interest. Nor is motor efficiency reduced through multiple repairsrewinds. This method produces heat in the winding conductor where it is most effective in driving out moisture. Sep 26, 2016 full rewinding 36slot single phase 3hp motor rpm 1440. At right is a motor from the late 1930s,made by electro machines,later doerr electric and now part of emerson electric. The first step in rewinding a motor is to remove the old winding. Replace the endplates on either side of the unit and tighten the screws until theyre secure. Power factor of a motor at full load varies between 0. No repair methods or materials may be used which make the motor more vulnerable to these conditions than it was as originally built.
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