Motor rewinding procedure pdf

Quality control requirements for calibration, materials, and documentation 4. Removal old coils are removed by heating the stationary part of the motor stator in an oven. Once youve successfully rewound your motor, reinsert the armature into the stator and fit both pieces back into the motor housing. Global electronic services offers a total range of machine shop and motor rewinding services for electric motors of all sizes. Unless you are experienced, having a professional perform the task will save you money and headache in the long run. 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. Keeping motor windings dry internet version of this manual created september 2000. Electric motor rewinding and rebuilding tutorial global. When rewinding, the new insulation should be given special impregnation, for humid climates, which is. No repair methods or materials may be used which make the motor more vulnerable to these conditions than it was as originally built.

The effect of repair rewinding on motor efficiency. Best of all, they are entirely free to find, use and download, so there is no cost or stress at all. At all times remember te follow correct safety procedures during the performance activity. Jul 06, 2016 the basic procedure is to measure the startup and running current for any motor while its connected to a load. Power factor of a motor at full load varies between 0.

To rewind an electric motor, remove the motors outer housing and use your hands to pull the armature out of the stator. Get motor rewinding procedure pdf file for free from our online library pdf file. Electric motor fundamentals free online training program this is a free online training program aiming to enhance your motor knowledge. Excess current causes heat, which must be dissipated. If you are searching for rewinding of one phase motor you can find it here. 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.

Electric motor repair equipment whitelegg machines. Aemteasa rewind study and good practice guide illustrates that when performed properly, electric motor repairrewind does not degrade efficiency. With the motor at normal operating temperature, the vibration velocity shall not exceed 2. 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. Comprehensive guide to electrical motor rewinding process. Our rewinding and remanufacturing procedures are fast, efficient and employ the latest available testing equipment, while using only the highest quality.

Connect a megohmmeter to measure the resistance of each winding lead to ground. 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. Improves power factor of the motor resulting in lesser current drawn and reduced cable losses key points to remember. Rewinding an electric motor is a tedious and difficult procedure. Abb training abb service for motors and generators. It has been developed for the petroleum, chemical, and process industries, and it may be adapted to other areas of interest. Priest electric is a reliable service provider trained in electric motor rewinding in boise, idaho, nevada, and oregon. 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. A general mathematical formulation for winding layout. Glossary sections 14 are part of the package that accompanies the motor to the service center. The new windings are wound on a coil winding machine, under the supervision of a technician, who controls the tension, layering and number. 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. The traditional method for motor rewinding involves removing the old coil, winding a new coil and varnishing.

During rewinding process, efficiency gets reduced by reducing number of turns from the winding specification. A text book of motor winding guide in urdu urdu books pdf. Reduced speed is provided down to about 50%, rated speed, but efficiency is low. I wonder if motor shops even make money on rewinding motors. Apr 14, 2018 full rewinding 36slot single phase 3hp motor rpm 1440. By performance characteristics, we mean the nameplate ratings e. Learn the basics of electromagnetic induction, motor selection criteria and proper maintenance techniques. 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. Model repair specifications for low voltage induction motors.

Were an industryleading partner, focused on getting your motor back up and running so your operations can minimize downtime and get back to profitability. How different burnout temperatures affect stator core losses. Please practice handwashing and social distancing, and check out our resources for adapting to these times. 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.

With our online resources, you can find motor rewinding procedure or just about anytype of ebooks, for any type of product. Rewinding of motors pdf the information in this report and the good practice guide to maintain motor efficiency part 2 was. Hello everyone, i am niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor. Compare the reading to documented or nameplate specifications. 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.

Read online now motor rewinding procedure ebook pdf at our library. As motors age, the current drawn generally rises because winding insulation resistance drops. If youve done everything properly, your motor should function like new. An insulation multimeter can be used to check insulation integrity between commutator segments prior to rewinding. How different burnout temperatures affect stator core. Electrical induction motor winding design software just about everything that you just find or searching incorporates electrical induction motor winding design software. Full rewinding 36slot single phase 3hp motor rpm 1440. This standard covers reconditioning, repair, and rewind of horizontal and vertical induction motors and of synchronous motors.

Sep 26, 2016 full rewinding 36slot single phase 3hp motor rpm 1440. Handoperated hydraulic pump giving up to 20 tonnes power. I should mention though, that the process is rather difficult though doable and buying the stocks of wire and other materials required, wasnt cheap. Follow these procedures to reduce problems when rewinding. Replace the endplates on either side of the unit and tighten the screws until theyre secure. This is the story about how i did just that and how you can do it too. Here are some of the things a designer needs to know in order to make an accurate winding calculation. Extraction height adjustable by hand crank operated rack and pinion. 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. 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. Nor is motor efficiency reduced through multiple repairsrewinds. 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. Jan 31, 2015 help diploma of associate engineering d. A fulltime writer since 2006, david dunning is a professional.

A guide to maintenance practices for small horsepower vering construction control and maintenance, including armature winding. Troubleshooting with insulation resistance test instruments. It applies to all voltages 15 kv and less, and all ratings above 0. The classification of motors can be done with considerations like the. Testing and commissioning procedure for electric motors eep. The first step in rewinding a motor is to remove the old winding. Repair and design of electrical machines, induction motor rewinding, electric motor design. 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. Rewinding motors with no specific controls on stripping and rewind procedures. Motor repair form for purchaser to describe the motor s condition, operating environment, and desired service 5.

This included studying the effects of a number of variables. Old coils are removed by heating the stationary part of the motor stator in an oven. Alternating current ac and direct current dc motors employ an insulated, currentcarrying coil essential to their operation. Electric motors are relatively simple mechanical devices, but rewinding them isntin fact, its one project thats usually best left. Vaezzadeh and hendi 2005 presented an online optimization controller for induction motor drives for smooth system performance and. Pdf the paper unifies previous experiences related to the motor rewinding. 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. Use of the star of slots in designing fractionalslot singlelayer synchronous motors. Commercially, this is done by baking the stationary part of a motor in an oven at 650 degrees fahrenheit for several hours. In this instructables i will show you, how to rewind and renovate old electric single phase electric motor. How to calculate winding data of a motor for particular hp. Nov 10, 2017 motor rewinding procedure pdf motor rewinding diagram electrical principles guide.

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. The effect of repairrewinding on motor efficiency iecex. The motor for any application should not be oversized or undersized. Armature winding1920pdf armature winding and motor repair. Hes rebuilding a small machine, of 1940s vintage, on which the motor is wound for 440v only, 3 phase, of course. Ac singlephase motors part 1 centrifugal switcha switch used to disconnect the start windings in a splitphase motor after the. This method produces heat in the winding conductor where it is most effective in driving out moisture. 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. We maintain the highest safety standards and with qualified professionals. Please practice handwashing and social distancing, and.

An electric motor is an electrical apparatus that converts electrical activity into automated energy. Electrical and motor machine shop safety procedures. One problem occurs when the newly rewound set of shunt fields is returned to the service center, roasted again. Leeson electric, has a threegeneration history in electric motor manufacturing. Shown at left is a motor from the early 1900s,made by st. At right is a motor from the late 1930s,made by electro machines,later doerr electric and now part of emerson electric. Motor rewinding procedure pdf pages 1 6 text version.