Rotating flux is only possible when 3 phase voltage or poly phase which is 120 degree apart in time is applied to a three phase winding or poly phase winding 120 degree apart in space then a three phase rotating magnetic flux is. Each motor is given a routine test as required by bs4999, as59 or nema mg 1 to determine that it is free from electrical or mechanical defects. Rotating flux is only possible when 3 phase voltage or poly phase which is 120 degree apart in time is applied to a three phase winding or poly phase winding 120 degree apart in space. Motor rewinding and remanufacturing at koffler youtube. In this instructables i will show you, how to rewind and renovate old electric single phase electric motor. Dc kirloskar induction motor rewinding pondicherry id company profile capability statement electric motor rewinding company albury about us motor rewinding services electric abb 200 kw motor rewinding part 4. Class y and a cover the various organic materials without and with impregnation respectively, while classes b and c cover inorganic materials, respectively with and without a binder. If motor is used is dc powered then it is called dc servo motor, and if it is ac. We hold expertise in offering wide variety of rewinding motor works to our clients. Aug 19, 2019 use a screwdriver to pry open the tabs on the brush pads. The repair work and testing being carried out is strictly as per is standards. Testing of increased safety ht induction motor for hazardous area.
Along with the photo is a brief explanation of the cause of the problem. Electric motors should be installed very carefully and should be looked after at regular intervals. Hello everyone, i am niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor. The tests and assessment for the ex e motors are as. For motors falling outside this description, the more comprehensive model specifications below are recommended.
Most of them are caused by the overheating of motor. Jul 06, 2016 a dmm digital multimeter, such as this keithley dmm7510 from tektronix, is a musthave instrument for motor testing. Feb 15, 2014 high voltage motor rewinding work, generator armeture rewinding, bangladesh. Do not lift both the motor and driven equipment with the motor lifting means. There are also other factors which greatly affect the performance of electric motors such as low resistance, dirt, moisture, overcurrent and vibrations. Singlephase threewire submersible motors require the use of control boxes. This degree of rotation can be controlled by applying the electrical pulse of proper width, to its control pin. Electric motors are key components in most industrial plants and equipment. For example, if a 100 hp motor has an unbalance factor of 3 percent, the motor should be derated to 0. The measurements shall be carried out with an instrument conforming to iso 2954 10 hz frequency range. Jan 31, 2015 help diploma of associate engineering d. Read online now motor rewinding procedure ebook pdf at our library. A wellplanned preventive maintenance program is the key to dependable, longlife operation of motors and generators.
Tender document for repair rewinding of 450 kw, kec. A general mathematical formulation for winding layout. Ac motor rewinding services our rich industry experience also allows us to offer our customers competitive low voltage ac motor rewinding services. Salient features of ht transformer design software packages. Charles dix, account manager, holland industrial, points out that the size of the motor can have a direct impact on cost. Motor synchronous speed varies directly with the control output frequency. Ht motor rewinding, motor rewinding sun tech enterprises. An electric motor is an electrical apparatus that converts electrical activity into automated energy. Htlt powerdistribution transformer design software. Model repair specifications for low voltage induction motors. Pdf winding design, modeling, and control for polephase. Motor coil winding machine motor winding machines exporter. Quality is emphasised at each step as a motor proceeds through each stage of design, assembly and testing.
A guide to maintenance practices for small horsepower vering construction control and maintenance, including armature winding. Claims that rewinding inevitably decreases the efficiency of induction motors are. Testing and assessment of ex e motor the designed ex e ht squirrel cage induction motor are tested and assessed for performance of motor to ensure that these designed motor will not be unsafe in hazardous area. All the motors are installed on varies locations in bhel factory and township. Maintenance safe maintenance practices performed by qualified personnel are imperative. They account for twothirds of all the electrical energy used by industrial commercial. The frequent use of variable frequency drives vfds can result in detrimental effects to electric motors because of. Use proper protective gear, care and procedures when handling, lifting, installing, operating and. This removes the starting winding and the motor continues to run on the main.
Offering you a complete choice of products which include motor winding machines, motor winding machine, motor rewinding equipment, coil winding for motors, ht coil winding machines and semi automatic motor coil winding machine. If you want to rotate and object at some specific angles or distance, then you use servo motor. No load trial upto 20 mw on rated voltage and speed. Electrical winding wire is used to create inductors. Simply rewinding a preepact motor could be less costly, but the energy savings seen on a newer premium efficient motor will offer tremendous energy savings over the life of the motor. Therefore, the frequency required to achieve a desired application speed can be approximated by dividing the desired speed by the motor rated speed and then multiplying by the rated. The wide array of our services includes ac motor rewinding, dc motors traction motors rewinding, ht motors rewinding, acdc electric motors and electric motor rewinding. All motor rewinding are considering f class insulation and separate prices shall be applicable for h class insulation. Page 1 page 2 page 3 page 4 table of contents page 5 page 6 names of partsmain features page 7 page 8 page 9 page 10 taking care of your page 11 strap and case page 12. What is the difference between ht and lt motor dear friend for the same power rating the size of lt motor is much bigger than ht motor. A wide range of dmms are available to measure voltage, current, and resistance, depending on the motor power ratings. Tender document for repair rewinding of 450 kw, kec make ht. Although management probably realizes the value of a good preventive maintenance pm program, they. If you are searching for rewinding of one phase motor you can find it here.
An inductor is a iron core with coils of wire wrapped around it. The high cost of the resultant downtime eats deeply into profits. Ht motor high tension motor latest price, manufacturers. For bearings fitted with proximity probes, the unfiltered peaktopeak value of vibration including. Old coils are removed by heating the stationary part of the motor stator in an oven. All these services are executed by our expert team of technicians under the supervision of. Additional special tests beyond the routine test are available on request.
Motor rewinding rewinding motor eletricalmotor rewinding rewinding dinamo rewinding small electric motors bruininks oseretsky test of motor proficiency desarrollo motor stroke, cylinder, motor, piston, and motor dc motor 2. The rotor consists of copper or aluminium bars connected. In modern plant operations, unscheduled stoppage of production or long repair shutdowns are intolerable. Testing and commissioning procedure for electric motors eep. Common causes for electric motor failure motor failure.
Most of the electric motor failures occur at the start up. Here, our team of experienced industry professionals allows us to offer low voltage ac motor solutions that can range from 110 volts to 440 volts 50hz60hz. Servo motor can be rotated from 0 to 180 degree, but it can go up to 210 degree, depending on the manufacturing. May 03, 2020 dc kirloskar induction motor rewinding pondicherry id company profile capability statement electric motor rewinding company albury about us motor rewinding services electric abb 200 kw motor rewinding part 4. On some motors, there may be as many as 1216 tabs in total.
Wedge the tip of a flatblade screwdriver underneath the thin metal tabs, then pull up gently on the handle to lift them enough to loosen the coiled wire. Winding design, modeling, and control for polephase modulation induction motors article pdf available in ieee transactions on magnetics 492. All these services are executed by our expert team of technicians under the supervision of our engineers. A text book of motor winding guide in urdu urdu books pdf. 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. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. The traditional method for motor rewinding involves removing the old coil, winding a new coil and varnishing. A thermal protector, automatic or manual, mounted in the end frame or on. Pdf the paper unifies previous experiences related to the motor rewinding. Determine the impact of rewindingrepair on motor effi ciency. Use a screwdriver to pry open the tabs on the brush pads. A servo motor is an electrical device which can push or rotate an object with great precision. The frequent use of variable frequency drives vfds can result in detrimental effects to electric motors because of the condition of power in manufacturing facilities.
It is just made up of simple motor which run through servo mechanism. Before starting maintenance procedures, be positive that. Inductors are used in a variety of electrical devices including. Try to bend the tabs as little as possible to avoid damaging them. Irregular windings in wound rotor induction motors. But in practical situation, there are several derating factors which need to be considered. Rewinding in ht motors codes description qty in no stator rewinding unit price a inr rotor rewinding unit. Other interesting manual andor automated methods and algorithms. The number of turns of the coil wire determines the inductance value.
The speed of an ac motor depends on the frequency of the input power and the number of poles for which the motor is wound. Testing of increased safety ht induction motor for. Winding layout, single layer winding, induction motors, rewinding technique, three phase motor. Model repair specifications for low voltage induction motors these model repair specifications are intended to cover routine repair and rewind of lowvoltage randomwound threephase ac squirrel cage induction motors. Electric motors and drives fundamentals, types and applications third edition austin hughes senior fellow, school of electronic and electrical engineering, university of leeds amsterdam boston heidelberg london new york oxford paris san diego san francisco singapore sydney tokyo newnes is an imprint of. The broken ends can damage the stator winding also. The bidder must have past experience of repairing rewinding of ht motors during last 7 years ending on 31. How to calculate electrical winding wires by weight. Winding to a singlephase induction motor to allow this motor to start and rotate normally. Alternating current ac and direct current dc motors employ an insulated, currentcarrying coil essential to their operation. But the insulaton level in ht motor is more strenghter than lt motor. Get motor rewinding procedure pdf file for free from our online library pdf file.
With the motor at normal operating temperature, the vibration velocity shall not exceed 2. Sk electric works rewinding repair of all ht lt ac dc moter geo lind nigeria limited. When the motor is coupled to equipment, ensure that system vibrations are within acceptable limit per iso 108161 to avoid failure of the motor. To rewind an electric motor, remove the motors outer housing and use your hands to pull the armature out of the stator. With the existence of newer insulating materials, namely, the plastics and silicones, during the middle of this century, a need was felt to reorganize the classification of the insulating materials. The electric motor in its simplest terms is a converter of electrical energy to useful. This is a single phase representation of windings and current flow. Sun tech enterprises in sector 24, faridabad offering ht motor rewinding, motor rewinding, motorrewinding. The effect of repairrewinding on motor efficiency iecex. T e c o mo t or p r c t s and i c s 2 large and large and high voltage motor range from teco teco s position as a world leader in the design and manufactuing of large induction motors is secured by an unfailing commitment.
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