To rewind an electric motor, remove the motors outer housing and use your hands to pull the armature out of the stator. This valuable resource is available only to easa members. While the stator is the same as that of the squirrel cage motor, it has a set. All stator and rotor windings shall be tested as part of the initial evaluation of the motor. At electrical apparatus, we understand the significance of your motor repair, and therefore restore ac and dc stators to service in a timely manner with repairs of the highest quality. Controlling the core temperature assures the continuation of the electrical characteristics of your stator. 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. Form wound electric motor repair specification specification for the repair of form wound electric motors volts ac to 6000 volts ac up to 12,500 horsepower 1. Electric motor repair rosenberg, robert, rosenberg, john, hand, august on. The current is carried through an armature or stator. Pdf electric motor repair for low voltage induction motors in pwm.
The electric motor operation is based on the following points. The rotor and stator windings are connected in parallel. Tutorial how to rewind electric motor part one youtube. While it is normally not practical to repair small, direct current dc motors that have burned out, other motors can be repaired by rewinding. We have a team of talented technicians and an array of tools and equipment at our disposal to provide you with stator services you can trust. Electric motor repair, model repair specifications for low voltage motors, and motor repair tech brief were produced by the u. Repair and overhaul services motion electric motor services. The rotor and stator are each connected from a different power supply, this gives another degree of freedom for controlling the motor over the shunt. The significant difference between the rotor and the stator is that the rotor is the rotating part of the motor whereas the stator is the stationary part of the motor. The armature windings conduct ac even on dc machines, due to the commutator action which periodically reverses current direction or due to electronic commutation, as in brushless dc motors. As with all modifications on electric or electronic equipment, make sure that you unplug.
Electric motor system diagnostics electric motor system diagnostics richard scott alltest pro, llc this session is eligible for 1 contact hour. Table of contents introduction motor cutaways dc motor 2 ac motor 4. This mechanical energy then can be supplied to various types of loads. The armature contains the coiled starformation for a stator copper or aluminum wiring commonly referred to as. 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. Electric motor rewinding can be done to make the motor workable again without the high cost of paying for a new motor.
The operation of an induction motor is not possible with an unequal number of stator and rotor poles, and this type of rotor does not respond automatically to change in a number of stator poles. The armature can be on either the rotor rotating part. The effect of repairrewinding on motor efficiencyeasaaemt. Three key measurements for electric motor reliability are. The effect of repairrewinding on motor efficiency easa. Internal alignment is making sure all the air gaps between the electric stator and rotor. Electric motor electric motor construction of induction motors. I dont miss the stress of trying to get customers motor repaired in a timely manner. This version of the easa motor rewind database software takes a large leap forward with the data that it provides members. We provide electric motor repair services for a broad range of clients all around the world. Stator windings to have all contaminants removed between coils and.
The key here is to avoid inserting a new winding into a defective core, then having to repair the core and repeat the rewind process, or worse, having to scrap the stator core. Causes and failures classification of industrial electric. Have your badge scanned at the door attend 90% of this presentation fill out the online evaluation for this session. Draw coils from your stator to your winding diagram. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotors axis. When repairing an electric motor,is it necessary to know the number of hours worked to fill out a work.
Get motor rewinding procedure pdf file for free from our online library pdf file. In electrical engineering, an armature is the component of an electric machine which carries alternating current. Easa warranty report forms resource library easa the. If you are searching for rewinding of one phase motor you can find it here. Watch the entire electric motor rewind process with this video from the gibbons engineering group workshop in essex. The singlephase induction motor is not selfstarting. Electric motor repair has always been at the core of leppertnutmeg.
For over 20 years ricky stator has been rewinding modifying and repairing stators for the powersports industry. Model repair specifications for low voltage induction motors. Predictive maintenance through electrical testing and. Downloadelectric motor repair pdf robert rosenberg. An electric motor is a device which converts an electrical energy into a mechanical energy. The insulcore solutions process provides the ultimate opportunity to potentially restore the core plate without dismantling the core, saving labor, eliminating the chance of unsatisfactory restack results and the possibility of scrapping an expensive piece of electrical equipment.
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. If the motor problems cant be resolved with this list. Predictive maintenance through electrical testing and motor. In repulsion motors the stator windings are connected directly to. At least one of the two magnetic field is generated by a solenoid carrying a current. Unit 16 electric motors objectives after studying this unit, the student will be able to state the purpose of an electric motor. The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Electric motor repair, model repair specifications for low voltage motors, and. An introduction to electric motors stmicroelectronics. Varnishing the windings of an electric motor or generator functions to insulate the windings from contaminants, to make the windings rigid and tight, and to dissipate heat.
The speed in a dc motor can be adjusted through the intensity of its current. The first copy of this software is free to active and allied members. Pdf it is necessary to present a motor repair specification for the repair of. With its vast experience and extensive data bank from all major electric motor oems, motion electric motor services is a key partner to maintain and protect the productivity of the critical equipment at the heart of your activities.
A twopole motor has one coil and one magnetic field arranged around the stator, a fourpole motor has two coils. Air gap is the space between an electric stator and a rotor. The frequency of routine service varies widely between applications. Ac and dc stator repair electric motor stator winding. Hence the number of rotor poles must be made equal to the number of stator poles. Electric motor repair equipment whitelegg machines. Electric motor management drives predictive maintenance. Mike brook, business development director for wyko industrial services, provides a basic guide for plant and maintenance. Conduct a stator core test before and after winding removal. Dip and bake epoxy varnishing, trickle varnishing, vacuum pressure. When we perform our dc motor rewinding service for your motor, we can then return the rewound coil and reinstall it with rebuilt armatures or other components as needed to get your motor functioning properly again. Read online now motor rewinding procedure ebook pdf at our library. Electric motor construction of induction motors britannica.
In this instructables i will show you, how to rewind and renovate old electric single phase electric motor. The text that was researched and compiled contains explanations of the motor parts, theory about electromagnetism and how current is used to make an electrical motor rotate. Repulsion motors are classified under single phase motors. Pool pump repair video series by the pump guys joseph and robert from the website. Unit 16 electric motors washington state university. Electric motor components causes of motor failures static electrical tests megohm, polarization index, hipot, surge static motor testing case studies static motor testing benefits dynamic electrical parameters connections dynamic motor testing case studies networked dynamic monitoring dynamic motor testing benefits. Ac electric motors and generators are the most common machines found in industries worldwide. Rewinding an electric motor is delicate and professional care is needed.
When we perform our dc motor rewinding service for your motor, we can then return the rewound coil and reinstall it with rebuilt armatures. Rewinding is the process that we sometimes use as a way to repair shorted, grounded or damaged motor coils. Under no circumstances shall the stator windings be touched by any of the. Many manufacturers request that warranty work be documented on this form. As the name suggests, this type of motor has only one stator winding main winding and operates with a singlephase power supply. The ultimate solution for stator core and lamination repair. A 4pole motor has twice as many windings, and it actually creates two sets of noh and south poles at the. After performing some core tests, the student should have a better understanding of how much time and potential cost can be saved by performing core tests before and. There are four types of varnishing methods that we will describe below.
What are electric motor rewinding and electric motor rebuilding services and why do you need them. When the motor is connected to a singlephase power. C troubleshoot and repair equipment repair and rebuild defective mechanical parts in electric motors, generators, and related equipment, using hand tools and power tools conduit to complete circuits between boxes. Integrated power services, or ips, is the leading provider of electric motor and generator repair services in north america. The rotor will constantly be turning to align its magnetic field with that of the stator field. The laminations are insulated from each other usually by a varnish layer. Then, use a flat head screwdriver to pry open the tabs on the brush pads, and then cut through the wires and pull them out by hand. Hello everyone, i am niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor.
Fitted with a turntable for easy rotation of the stator. Helping our members with engineering support and education for all aspects of repair and maintenance of electric motors, drives, gearboxes, transformers, controls, pumps. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors. For these hours to appear on your certificate, you must. This way we can evaluate your stator and make sure. An indepth troubleshooting guide to help you with your ac electric motor issues. The basic idea of an electric motor is to generate two magnetic fields. Electric motor repair electric motor repair rev 1116 resins, varnishes, and epoxies for elantas electrical insulation companies are strategically located throughout the world to meet the primary insulation, secondary insulation and electronic and. A repulsion motor is a type of electric motor which runs on alternating current ac. The phase relation between the rotor and stator magnetic field i. After a motor is rewound, the windings must be further insulated with resin or varnish.
There are various reasons and factors when deciding to have a motor rewound rather than purchasing a new one. Ideal for impregnation of stators and transformers where good electrical and moisture resistant properties are needed. Causes and failures classification of industrial electric motor conference paper pdf available october 2016 with 2,546 reads how we measure reads. 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. Insulcore solutions electric motor core repair msc. Pc line pclw310 driver c program files hewlettpackard digital imaging bin hpfccopy. Small electric motor repair by josh weber updated july 21, 2017. The ultimate goal in measuring the stator is concentricity within 10% of the total diameter and air gap from stator to rotor. We use only the best materials available and can rewind a wide range of stators. Measure velocity, horsepower, revolutions per minute rpm, a mperage, circuitry, and. A factory can kick out a motor winding in minutes when making hundreds. The varnishing method used in the repair process is important for efficiency and for the application of the electric motor or generator. The stator is the stationary part of a rotary system, found in electric generators, electric motors, sirens, mud motors or biological rotors. The other differences between the stator and rotor are shown below in the comparison chart.
Department of energys office of industrial technologies oit with input from trade associations, consulting companies, manufacturers, nonprofit corporations, and others. The stator frame consists of laminations of silicon steel, usually with a thickness of about 0. Repair and rebuild defective mechanical parts in electric motors, generators, and related. This insulation protects the windings from contamination, shorting electrically, and also make the windings more mechanically rigid. The ace energy efficient motor stripping system eemss pdf specifications provides motor shops with the ultimate in control. Rotor and stator magnetic fields 3 20062016 the rotation is obtained thanks to the attractive force between two magnetic fields. Finally, a comparison between different motors is presented. Why do you think the motor needs repair it smokes, it doesnt run, it needs preventive. The motors which are all operating under dc supply is called dc motor. Sometimes 2 additional for shunt field terminals cabinet type and position dc field supply required. Sr class cp and sr class sl electric multiple units but has been superseded by other types of motors. In all singlephase induction motors, the rotor is the squirrel cage type.
I removed the coils off my evinrude to test and inspect them. The intent of this specification is to prescribe the minimum standards to be followed by repair. This article describes ac electrical motor troubleshooting. The motor speed depends on the number of separate magnetic fields created by the coils in the stator. Jan 24, 2014 three key measurements for electric motor reliability are. Bookmark file pdf johnson evinrude electric outboards service manual electric start to outboard motor 92 johnson boat motor is retrofitted to work both electric start as well as pull start. Type slt heavy duty hydraulic stator lifting table with hydraulic power unit to raise and lower the table to give the best working height. Jan 05, 2019 sa video na ito ay papakita ko sa inyo kung paano mag repair ng electric fan. The magnetic field in the stator rotates around the motor at a speed of 3 600 rmin. An electric motor will always run at a slightly slower speed than the cycling magnetic field. The 3phase set of currents, each of equal magnitude and with a phase. Electric motor service motor rewinding, stator winding leppert. It was formerly used as a traction motor for electric trains e.
Ips shreveport service center electric motor repair. Easas warranty report forms provide the ideal way to record your warranty service accurately. Lift units or parts such as motors or generators, using cranes or chain hoists, or signal. Aug 19, 2019 to rewind an electric motor, remove the motor s outer housing and use your hands to pull the armature out of the stator.