Based on the rotor construction, 3 phase induction motor can be of two types. Divide the leakage reactances based on the nema design types. Single phase and three phase are the two types of an ac induction motor. Ieee std 1122004 revision of ieee std 1121996 112tm ieee standard test procedure for polyphase induction motors and generators 3 park avenue, new york, ny 100165997, usa. The purpose of these tests is to estimate the performance characteristics of the induction motor. Induction machines are by far the most common type of motor used in industrial, commercial or residential settings. When threephase stator winding of an induction motor is energized from a 3 phase supply, a rotating magnetic field is set up which rotates around the stator at synchronous speed ns.
This test consists of the following tests in addition to the routine tests. As energy costs rise, more emphasis is being placed on determining the health of large inductive motors. A universal motor is a special type of motor which is designed to run on either dc or single phase ac supply. As the electrical load increases on the generator, the mechanical power increases into the generator and out of the induction motor, thus increasing the load on the induction motor shaft. It is conducted on each product manufactured to confirm proper maufacturing of each and every units. Ieee std 1122004, ieee standard test procedure for. Srms are made up of laminated stator and rotor cores with ns2mq poles on. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. Induction motor basics, single phase and three phase. Dec 19, 2015 once the motor picks up the speed, this additional winding is removed from the supply. The purpose of this test at induction motor testing is to measure the resistance of stator, rotor and exciter windings to ensure that the. Determination of inductionmotor parameters determination of inductionmotor parameters dc test determines r1 connect any two stator leads to a variablevoltage dc power supply adjust the power supply to.
With rated electrical input the motor will deliver rated output. Selection of induction motors for industrial applications part 1 photo credit. In this test, a rated, balanced ac voltage at a rated frequency is applied to the stator while it is running at no load. These tests are performed to check the electrical or mechanical defects of the induction motor. Induction motor, no load test, blocked rotor test, vibration test, temperature test, phase sequence test, insulation resistance test. Motorcad induction motor combined electromagnetic and thermal model february 2015 description the motorcad allows the machine performance, losses and temperatures to be calculated for an induction machine. Determination of inductionmotor parameters noload test determine the magnetizing reactance, xm and combined core, friction, and windage losses. The no load test on an induction motor is conducted to measure the rotational losses of the motor and to determine some of its equivalent circuit parameters. Ieee std 1122004, ieee standard test procedure for polyphase. Motor vibration shall be measured in a triaxial direction, i. Introduction the induction motor is one of the most important motors used in industrial applications. This test is not repeated on other products of same type. Along with preliminary tests, these tests are also done on motor. At full load power factor of an induction motor ranges from 0.
There are mainly two types of induction motor on the basis of power supply, single phase induction motor and three phase induction motor. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. The ideal value of the motor run capacitor varies with t. An induction motor also known as an asynchronous motor is a commonly used ac electric motor.
No load test and block rotor test testing of induction. What is the difference between type test and routine test. Jul 06, 2016 the test generally applies between 100 and 5,000 v or more. Hence, an utmost care should be exercised in selection of most appropriate type of motor considering number of technical factors for each application, so that the motor would provide desired and optimum performance. There basically 2 types of induction motor depending upon the type. The types of induction motor depend upon the input supply. Srms are made up of laminated stator and rotor cores with ns2mq poles on the stator and nr poles on the rotor. Like any electric motor, a 3phase induction motor has a stator and a rotor. Oct 29, 2018 in this video i will show you types of electrical motor and its applications. The locked rotor test is made at 15 hz to minimize the errors due to saturation and skin effects. Draw the approximate equivalent circuit for the motor lockrotor noload dc test v line 36. Conduct locked rotor tests on 3phase induction motors.
Diagnostics of rotor and stator problems in industrial. Induction motors ppt transformer electrical engineering. The rotor is unblocked and allowed to run unloaded at rated voltage and rated frequency. What do all those things on an ac motor nameplate mean. Modeling and testing of induction motors slideshare. So in that case, new employee may leave the organization at the beginning and then the organization may need to follow all the process of recruiting and new employee to the organization.
Determination of induction motor parameters noload test determine the magnetizing reactance, xm and combined core, friction, and windage losses. A speedometer is used to measure the rotor speed, and no particular noise, excess vibration and abnormal temperature rise shall be observed. This is one of the most widely used types of single phase induction motors. The basic idea of an electric motor is to generate two magnetic fields. Load test of induction motor to determine how speed, efficiency, power factor, stator current, torque and slip of an induction motor vary with load, the load test on an induction motor is performed. Apr 01, 2020 chapter 3 phase induction motor drives, ppt, electrical machines, semester, engineering electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Nema mg1 includes the first three tests for all motors, and the fourth test for medium motors only. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Nov 03, 2019 an induction motor also known as an asynchronous motor is a commonly used ac electric motor.
Selection of induction motors for industrial applications. In this type of three phase induction motor the rotor is wound for the same number of. Chapter 3 phase induction motor drives, ppt, electrical. The primary purpose of the routine test is to insure freedom from electrical and mechanical defects, and to demonstrate by means of key tests the.
This test tells us the magnitude of constant losses occurring in the motor. In this video i will show you types of electrical motor and its applications. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. The stator carries a 3phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding only the stator winding is fed from the 3phase supply. Generally ac induction motors are used for constant speed applications. The machine is started in the usual way and runs unloaded from normal voltage mains. Now lets just take a brief look on types of induction motor. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. These are also called as asynchronous motors, because an induction motor always runs at a speed lower than synchronous speed. A protocol involving voltage level, time duration, intervals between tests and connection methods must be composed, taking into account the type and size of the equipment, its value and role in the production process and other factors.
This is the basic principle followed by all these types of single phase induction motors. An induction motor can therefore be made without electrical connections to the rotor. Environmental faults in three phase induction motor. Single phase induction motors arenot a selfstarting motor, and three phase induction motor are a selfstarting motor. Squirrel cage and wound rotor or slip rig induction motor. Squirrel cage induction motor is used in lathes, drilling machine, fan, blower printing machines etc. The purpose of a performance test is to evaluate all the performance characteristics of the induction motor. Record all nameplate information for the induction motor. The rotor will constantly be turning to align its magnetic field with that of the stator field. Introduction to induction motor the engineering projects. List and describe the more commonly used equipment in an electric substation.
The load test on induction motor is performed to compute its complete performance i. It is used to convert electrical energy into mechanical energy. This introduction is not part of ieee std 1122004, ieee standard test procedure for polyphase induction motors and generators. In this tutorial will describe how to model the electromagnetic performance of a. A regular ac induction motor usually can be used as a generator, without any internal modifications. Routine tests the primary purpose of the routine test is to insure freedom from electrical and mechanical defects, and to demonstrate by means of key tests the similarity of the motor to a standard motor of the same design. Induction motor works on the principle of induction where electromagnetic field is induced into the rotor when rotating magnetic field of stator cuts the stationary rotor.
In this type of three phase induction motor the rotor is wound for the same number of poles as that of stator but it has less. Sep 27, 2016 at full load power factor of an induction motor ranges from 0. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. During this test, the motor is operated at rated voltage. Loss measurement including stray load loss blocked rotor saturation characteristic. Ppt induction motor powerpoint presentation free to. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. Which type of induction motor is suitable for electric. The problem with a single phase capacitor run motor is they have a secondary motor winding and a capacitor in series to provide delayed supply of ac sort of like a pseudo two phase ac motor.
Induction motor testing routine testing or fat test. Types of electrical motor and its applications in hindi. To determine the equivalent circuit parameters of an induction motor. This document is highly rated by electrical engineering ee students and has been viewed 787 times. Uses soft magnet rotor that is magnetized by the application of current in the stator coils 3. Note that a squirrelcage induction machine has only stator terminals. Induction generators operate by mechanically turning their rotors faster than synchronous speed. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction. The working of the threephase induction motor is based on the principle of electromagnetic induction. The set up for no load test of induction motor is shown in the figure. Telecommunication engineering, southwest jiaotong university, china, 2005 thesis submitted for the degree of masters of engineering science in school of electrical and electronic engineering the university of adelaide, australia august 2010. The rotor of an induction motor can be a squirrel cage rotor or wound. The rotor of an induction motor can be a squirrel cage rotor or wound type.
Different types of fault in three phase induction motor. You should also make a dc measurement of stator winding linetoline resistance using a dmm. Induction motor surrounding environment such as ambient temperature and moisture etc. List and describe the more commonly used equipment in. Diagnostics of rotor and stator problems in industrial induction motors by fang duan b. Jan 12, 2018 in this video i describe about testing of induction machine like, 1. 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. An induction generator or asynchronous generator is a type of alternating current ac electrical generator that uses the principles of induction motors to produce electric power. Differentiate between the various types of generating electric power stations. The no load test is similar to the open circuit test on a transformer. Four principal types of electric motors are suitable for inspace applications, ac induction motors, brush direct current bdc motors, brushless direct current bldc motors, and stepper motors. The induction motor is the most commonly used type of ac motor. By definition, an induction motor converts electrical energy to useful mechanical energy.
Written for professionals who work in electric motors, this covers updated traction applications, the latest on solidstate motordrive controllers, electrical and mechanical parameters, specifications, shapes, performance, protection, and more. Dec 30, 2018 these tests are performed to check the electrical or mechanical defects of the induction motor. Determine the motor parameters and the total core, friction and windage losses. Ieee std 1121996 applies to induction motor testing. There are single phase induction motors and three phase induction motors. Once the motor picks up the speed, this additional winding is removed from the supply.
The 3phase set of currents, each of equal magnitude and with a phase. An induction motors rotor can be either wound type or squirrelcage type. These motors are generally series wound armature and field winding are in series, and hence produce high starting torque see characteristics of dc motors here. The no load test of 3 phase induction motor is performed on induction motor when it is running without load. The information on a motor nameplate can be arranged in categories.
Motor cad induction motor combined electromagnetic and thermal model february 2015 description the motor cad allows the machine performance, losses and temperatures to be calculated for an induction machine. Prototype tests the purpose of a prototype test is to evaluate all the performance characteristics of the motor. In three phase induction motor different faults could be occurred simultaneously and, in these faults, environmental fault is also so much important. An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Table 1 shows the most predominant applications for each type of motor. It is said that the invention of the ac induction motor was the deciding factor in the 19th century battle between ac and dc. A portion of rotating magnetic field in a threephase. Testing and commissioning procedure for electric motors eep. F or an uncoupled motor or closecoupled assemby that can be run dry, perform no.
Amongst many types of electrical motors, induction motors still enjoy the same popularity as they did a century ago. The rotor has salient poles and a cage so that it starts like an induction motor, and runs like a synchronous motor. Induction motor testing and evaluation plant services. Synchronous speed means the speed of the rotating magnetic field in the stator. That is why, universal motors generally comes built into the device they are meant to drive. No load test of induction motor your electrical guide. Induction motors are the most commonly used motors in many applications. However, the dc motor has still been with us since then. It is conducted on first prototype of product to confirm the design specifications. Induction motor is an energy conversion device that converts electrical. Types of single phase induction motors electronics hub. In this video i describe about testing of induction machine like, 1.
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