Start induction motor dynamic and steadystate performance of a. An885 ds00885apage 2 2003 microchip technology inc. Three phase induction motor electromagnetic induction. There are two types of rotors which are employed in 3 phase induction motor. Pdf on may 21, 2006, walid balid and others published 3phase ac induction motor find, read and cite all the research you. The 1hp, 3hp, and 5hp threephase induction motor are. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Be careful it can hurt to tangle with a threephase motor.
Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, the absence of commutator and good speed regulation. This is the principle of operation of an induction motor of any type. This would result in a balanced three phase current. Assuming that the stator resistance r1 is measured at dc and that phase power.
These are excited by a balanced threephase voltage supply. The friction and windage losses are 600 w, the core losses are 1800 w, and the stray losses are negligible. The rotor of the induction motor contains cylindrical core with parallel slots that contain conductors. Induction motor totallyenclosed fancooled nema standard epact three phase induction motors. Pdf induction motors have been the workhorse of industry since decades. It consists stator winding it is housed on the motor frame. Two day national conference rteece2014 17th,18th january 2014 40 simulation of three phase electronic soft starter using four thyristors 1vishva pandya, 2vinod patel. If the speeds become equal, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. A singlephase motor is a rotating machine that has both main and auxiliary windings and a squirrelcage rotor. The same field is utilized by one of the stator windings to work as an induction motor to meet mechanical load while, a three phase emf is induced in the other two sets of windings.
Mostafa elshahed objectives learn a brief history of the electrical power systems construction. You should also make a dc measurement of stator winding linetoline resistance. How to wind threephase stators selfpaced, highly focused, computerbased training for winding technicians. The threephase induction motor is the extensively used for various. Single phase induction motor the singlephase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. How to test a 3 phase motor windings with an ohmmeter.
The frame is either made up of diecast or fabricated steel. The arrangement of the winding is so as to produce a rotating magnetic field. 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. Thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. Threephase induction motors authorstream presentation. The three phase induction motor is the most widely used electrical motor. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. Ppt induction motor powerpoint presentation free to. Simulation of three phase electronic soft starter using.
Differentiate between the various types of generating electric power stations. Threephase induction motor common itemsiinstruction manual. Rms calculation and curve fitting technique are used to convert and smooth the data before calculation and analysis. The most common configuration of a three phase motor is the delta. Record all nameplate information for the induction motor. Types, construction and principle of operation, 3 phase induction motor, general phasor diagram, equivalent circuit, power and torque relations, condition for. Every 3 phase motor has six 6 terminals with the supply voltage connected to three 3 of those terminals. Induction machines guru nanak dev engineering college. The shaft should be rotated several revolutions about every month to maintain proper distribution of the grease within the. There are a lot of applications of 3 phase induction motor, to name a few 1. The singlephase motor stator has a laminated iron core with two windings arranged perpendicularly.
The single phase induction motor resembles, threephase, squirrelcage motor except that, single phase induction motor has no starting torque and some special arrangement have to be made to make it as self starting. Lecture 6 three phase induction motors cairo university. All about motors page motor protection 83 notes on engineering 815 circuit documents 819 power supply 821 control circuit supply 824 contactor markings 825 directonline start of threephase motors 826 control circuit devices for directonline start 834 stardelta switching of threephase motors 835. Accurate representation of a 6 pole 3phase ac induction motor file. Simulation of three phase electronic soft starter using four thyristors issn. What is the three phase induction motor working principle.
If the motor is not in operation over three months, add grease to each bearing per lubrication nameplate. A 3 phase induction motor consists of a stator which contains 3 phase winding connected to the 3 phase ac supply. Threephase and sixphase induction motor electromagnetic. Use the three phase induction motor with plc for any application. The most common type of ac motor being used throughout the work today is the induction motor. Although designed for novice winders, experienced technicians will benefit, too. The stator copper losses are 2 kw, and the rotor copper losses are 700 w. So the rotor speed will depend on the ac supply and the speed can be controlled by varying the input supply. Presentation on 3 phase motor free download as powerpoint presentation. 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. Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, absence of commutator and good speed regulation. Frame provides mechanical support to the stator and rotor. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor.
Performance characteristics of 3phase induction motors objectives to carry out a load test on a squirrel. The frame of three phase induction motor should be strong and rigid as the air gap length of three phase induction motor is very small. Synchronous motors are special types of motors used in constant speed applications, whereas most of the motors used in the industrial applications are of induction type. How to test a 3 phase motor windings with an ohmmeter custom search. If a three phase motor is running when the single phase condition occurs, it will attempt to deliver its full horsepower, enough to drive. The retardation test method is also used to identify the rotor moment of inertia and the viscous friction coefficient of the test system. A wound rotor or slip ring motor has a 3phase winding, similar to the stator winding. This document was uploaded by user and they confirmed that they have the permission to share it. Threephase induction motor protection systems and its. Construction of three phase induction motor electrical4u. Single phase induction motor speed control this project is designed to control the speed of a singlephase induction motor by using operating knob. Star wye configuration with the delta side connected to supply voltage.
Turn on and reverse the direction of induction motor. The stator of the motor consists of overlapping winding offset by an electrical angle of 120o. Supplying of both main and auxiliary windings enables the singlephase machine to be driven as a twophase machine. Introduction to induction motor instrumentation and. Design and implementation of three phase induction motor control system in closeloop mode. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain.
As previously, we have covered a lot of important topics. Single phase induction is the property of its rightful owner. Principle of operation a rotating magnetic field rmf is set up in the stator when a 3. Threephase or polyphase motors are of mainly two types. Like any electric motor, a 3phase induction motor has a stator and rotor. In this chapter, we shall focus our attention on the construction. Further, in an induction machine, the windings are not all located in the same. One single phase wattmeter plus miscellaneous apparatus as needed. It acts as a covering and provides protection and mechanical strength to all the inner parts of the machine. Download 3 phase induction motor powerpoint presentation. Applications of threephase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. Speed control of three phase induction motor by vvvf. The major difference between them is that transformer is static in nature i. Equations 1 3 represent the currents that ow in the three phase windings.
Today we are going to made available a powerpoint presentation file for all. Bldc motors come in singlephase, 2phase and 3phase configurations. Experiment 3 application on three phase induction motor. Three phase induction motor free download as powerpoint presentation. Presentation on 3 phase motor electromagnetic induction machines. A 480v, 60 hz, 50hp, three phase induction motor is drawing 60 a at 0. Ppt single phase induction powerpoint presentation.
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