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