Types, construction and principle of operation, 3 phase induction motor, general phasor diagram, equivalent circuit, power and torque relations, condition for. Equations 1 3 represent the currents that ow in the three phase windings. Simulation of three phase electronic soft starter using. Download 3 phase induction motor powerpoint presentation. Threephase and sixphase induction motor electromagnetic. Single phase induction is the property of its rightful owner. Two day national conference rteece2014 17th,18th january 2014 40 simulation of three phase electronic soft starter using four thyristors 1vishva pandya, 2vinod patel. A 480v, 60 hz, 50hp, three phase induction motor is drawing 60 a at 0. How to test a 3 phase motor windings with an ohmmeter custom search. These are excited by a balanced threephase voltage supply. The arrangement of the winding is so as to produce a rotating magnetic field. One single phase wattmeter plus miscellaneous apparatus as needed.
Characteristics evaluation of 3 phase induction motors. Threephase or polyphase motors are of mainly two types. Three phase induction motor free download as powerpoint presentation. Construction of three phase induction motor electrical4u. You should also make a dc measurement of stator winding linetoline resistance. Experiment 3 application on three phase induction motor. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. A wound rotor or slip ring motor has a 3phase winding, similar to the stator winding. 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. 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. The frame is either made up of diecast or fabricated steel. So the rotor speed will depend on the ac supply and the speed can be controlled by varying the input supply.
This document was uploaded by user and they confirmed that they have the permission to share it. Introduction to induction motor instrumentation and. 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. 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. 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. Although designed for novice winders, experienced technicians will benefit, too.
Be careful it can hurt to tangle with a threephase motor. Use the three phase induction motor with plc for any application. The singlephase motor stator has a laminated iron core with two windings arranged perpendicularly. 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. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Threephase induction motor protection systems and its. The retardation test method is also used to identify the rotor moment of inertia and the viscous friction coefficient of the test system. Further, in an induction machine, the windings are not all located in the same. How to wind threephase stators selfpaced, highly focused, computerbased training for winding technicians. Threephase induction motor common itemsiinstruction manual. Lecture 6 three phase induction motors cairo university. Ppt induction motor powerpoint presentation free to. Rms calculation and curve fitting technique are used to convert and smooth the data before calculation and analysis.
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. Accurate representation of a 6 pole 3phase ac induction motor file. Presentation on 3 phase motor free download as powerpoint presentation. Star wye configuration with the delta side connected to supply voltage. Supplying of both main and auxiliary windings enables the singlephase machine to be driven as a twophase machine. Bldc motors come in singlephase, 2phase and 3phase configurations. What is the three phase induction motor working principle. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. The rotor of the induction motor contains cylindrical core with parallel slots that contain conductors. Differentiate between the various types of generating electric power stations.
The stator threephase windings can also be connected in a delta configuration. 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. Single phase induction motor speed control this project is designed to control the speed of a singlephase induction motor by using operating knob. Presentation on 3 phase motor electromagnetic induction machines. 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. It acts as a covering and provides protection and mechanical strength to all the inner parts of the machine. The three phase induction motor is the most widely used electrical motor. The stator copper losses are 2 kw, and the rotor copper losses are 700 w. An885 ds00885apage 2 2003 microchip technology inc. Principle of operation a rotating magnetic field rmf is set up in the stator when a 3. If the motor is not in operation over three months, add grease to each bearing per lubrication nameplate. 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.
Induction machines guru nanak dev engineering college. Induction motor totallyenclosed fancooled nema standard epact three phase induction motors. Today we are going to made available a powerpoint presentation file for all. Design and implementation of three phase induction motor control system in closeloop mode. The friction and windage losses are 600 w, the core losses are 1800 w, and the stray losses are negligible. When we connect the primary winding, or the stator to a 3 phase ac. How to test a 3 phase motor windings with an ohmmeter. Introduction threephase induction motors are the most common and frequently encountered machines in industry simple design, rugged.
Speed control of three phase induction motor by vvvf. There are two types of rotors which are employed in 3 phase induction motor. As previously, we have covered a lot of important topics. Simulation of three phase electronic soft starter using four thyristors issn. 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. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. Ppt single phase induction powerpoint presentation.
Frame provides mechanical support to the stator and rotor. Assuming that the stator resistance r1 is measured at dc and that phase power. Turn on and reverse the direction of induction motor. Record all nameplate information for the induction motor. A 3 phase induction motor consists of a stator which contains 3 phase winding connected to the 3 phase ac supply. The rotor winding terminals are connected to three slip rings which turn with the rotor. The 1hp, 3hp, and 5hp threephase induction motor are. In this chapter, we shall focus our attention on the construction. The most common configuration of a three phase motor is the delta. 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. A singlephase motor is a rotating machine that has both main and auxiliary windings and a squirrelcage rotor.
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 threephase induction motor is the extensively used for various. The major difference between them is that transformer is static in nature i. 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. Start induction motor dynamic and steadystate performance of a. Learn the principle of power factor improvement and evaluating the cost of electricity. It consists stator winding it is housed on the motor frame.
Threephase induction motors authorstream presentation. Three phase induction motor electromagnetic induction. Applications of threephase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. Pdf induction motors have been the workhorse of industry since decades. Performance characteristics of 3phase induction motors objectives to carry out a load test on a squirrel. This article concentrates only on threephase induction motor and its protection. Like any electric motor, a 3phase induction motor has a stator and rotor. List and describe the more commonly used equipment in an electric substation. This would result in a balanced three phase current. The stator of the motor consists of overlapping winding offset by an electrical angle of 120o. The motor is supplied by balanced threephase voltage at the terminals. The most common type of ac motor being used throughout the work today is the induction motor.