List and describe the more commonly used equipment in an electric substation. In the case of three phase ac alternating current operation, the most widely used motor is a 3 phase induction motor, as this type of motor does not require an additional starting device. Construction, working, torque speed characteristic and application. Construction of 3phase induction motor polytechnic hub. Safety information 1 description 2 transport, assembly, and connection 3 startup 4 operation 5 faults 6 maintenance 7 spare parts 8 notes 9 threephase induction motor. The major difference between them is that transformer is static in nature i. Ppt threephase induction motor electrical engineering ee. The induction motor rotor is a completely shortcircuited conductive cage.
A 3 phase induction motor has two main parts i stator and ii rotor. Pdf construction of three phase linear induction motor. Basic construction of 3phase ac induction motors you should. Nov 27, 2019 an electrical motor is an electromechanical device which converts electrical energy into mechanical energy. The stator carries a 3 phase winding and is fed from a 3 phase supply. There are many types of ac motors, but this course focuses on three phase induction motors, the most common type of motor used in industrial applications. Design of a three phase squirrel cage induction motor for. The basic idea of an electric motor is to generate two magnetic fields. Only the stator winding is fed from the 3 phase supply. Ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. 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. Three phase induction motor construction electrical academia. The speed regulation of the split phase motor is nearly same as that the three phase induction motor therefore it is called as constant speed motor.
Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. The topic lies under the basic electrical and electronics engineering course that. The stator of three phase induction motor is made up of numbers of slots to construct a 3 phase winding circuit which we connect with 3 phase ac source. This rotor is made up from parallel aluminum or copper bars. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. An induction motor can therefore be made without electrical connections to the rotor. The video highlights details regarding the construction of three phase induction motor. Most of three phase induction motor use squirrel cage rotor as it has a remarkably simple and robust construction enabling it to operate in the most adverse circumstances. Record all nameplate information for the induction motor. Designing of three phase squirrel cage induction motor for.
Stator and winding of a threephase induction motor. This article explains the construction, working principle of single phase induction motors. Single phase induction motors are used extensively for smaller loads, such as household appliances like fans. The rotor is separated from the stator by a small airgap which ranges from 0. Third international conference on advances in control and optimization of dynamical systems march 15, 2014. A linear induction motor lim is a specific type of alternating current ac motor designed to produce motion in a straight line. This 3 phase motor is also called as an asynchronous motor.
A single phase induction motor is inherently not selfstaring can be shown easily. One single phase wattmeter plus miscellaneous apparatus as needed. Although single phase induction motor is more simple in construction and is cheaper than a 3 phase induction motor of the same frame size, it is less efficient and it operates at lower power factor. The text that was researched and compiled contains explanations of. Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three. Know about the most popular and almost unbreakable construction of squirrel cage induction motor.
Apr 07, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Wound rotor induction motor the engineering projects. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. There are two types of 3phase induction motor based on the type of rotor used.
You should also make a dc measurement of stator winding linetoline resistance. This paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines construction and the testing process of a working. The three phase squirrelcage induction motor can, and many times does, have the same armature stator winding as the three phase synchronous motor. Basic construction of 3phase ac induction motors you. Starting of 3 phase induction motors, high starting torque motors, speed control. In this work a conventional three phase squirrelcage type induction motor with specifications 10 hp, 415v, stardelta connected and 4 poles is chosen for comparison with our motor, which is designed for good efficiency. The 3phase set of currents, each of equal magnitude and with a phase. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. Induction motors are by ac switchboard and it is a. The difference in speed between rotor, the synchronous speed and the rotating. However, it suffers from the disadvantage of a low starting torque. Those induction motors which employ squirrel cage rotor are called squirrel cage induction motors. Dec 29, 2017 apr 07, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field.
A three phase induction motor runs on a three phase ac supply. The torque in a hysteresis motor is produced due to hysteresis and eddy current induced in the rotor by. It is also called asynchronous motor because it does not run at a synchronous speed. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. An electrical motor is a device that has brought about one of the biggest advancements in the fields of engineering and technology ever since the invention. As in the synchronous motor, applying three phase currents to the armature creates a synchronously rotating magnetic field. A lim operates under the same principles as its ac rotary motor counterpart, typically powered by a three phase voltage scheme with a. We saw the construction of the squirrel cage induction motor. Today, i am going to tell you about a wound rotor induction motor, which is also a type of 3 phase induction motor. Oct 10, 2016 hi friends, i hope you are fine and having fun. The video tutorial is essentially a part of the basic electrical and electronics engineering. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Instructions for the installation, operation and maintenance of elektrim three phase induction brake motors 143t286t frame. Differentiate between the various types of generating electric power stations.
The main difference between slip ring and squirrel cage induction motor is the rotor construction. Conversion of electrical power into mechanical power takes place in the rotating part of an electric motor. The stator carries a 3 phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding only the stator winding is fed from the 3 phase supply. Construction of induction motor the three phase induction motor is a preferable type of motor. It is made up of a number of stampings, which are slotted to receive the windings. A 3 phase induction motor uses current delivered in three phases in a sequence into the coils of a stator to create a rotating magnetic field. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. The single phase motor stator has a laminated iron core with two windings arranged perpendicularly.
Speed torque characteristics of 3 phase induction motor duration. Three phase squirrelcage induction motors are widely used as industrial drives because they are selfstarting, reliable and economical. Y2 series 3 phase induction motors are characterized with. Starting method for induction motors a 3 phase induction motor is theoretically self starting. 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. Know about the different winding slots, lamination of the stator and its construction. Construction and working of 3 phase induction motor on ship.
The three phase induction motor is the most widely used electrical motor. These three phase motors consist of a stator and a rotor and between which no electrical connection exists. They have very simple and rugged almost unbreakable construction. Parida department of electrical engineering national institute of technology, silchar,assam, india email. The design of y2 series induction motor absorbed the advanced technology of electric motors around the world. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Construction of three phase induction motor electrical4u. It is mostly used in industrial drives because it is very reasonable and vigorous, economical and reliable. Ppt threephase induction motor electrical engineering. The stator separate from rotor by small air gap have ranges from 0. Threephase induction motor operating instructions 1ph722. These motors can be operated either directly from the mains or from adjustable variable frequency drives. The stator carries a 3 phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding. Y2 series three phase induction motor i asynchronous motor y2 series three phase asynchronous motor is a kind of totally enclosed fancooled tefc squirrelcage induction motor.
Ac induction motors are also the most common motors used in main powered home appliances. Advantages and disadvantages of 3 phase induction motors. 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. An induction motors rotor can be either wound type or squirrelcage type. This induces an electric field in a coil or squirrel cage to drive a rotor. The 3 phase set of currents, each of equal magnitude and with a phase. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the explanations to suit the intended reader. In my last article, we have discussed squirrel cage induction motor which is a type of 3 phase induction motor. These stator and rotors are constructed with the use of highmagnetic core materials in order to reduce hysteresis and eddy current losses.
Hysteresis motor a hysteresis motor is a synchronous motor with a uniform air gap and without dc excitation. On this topic, i will explain in details about 3 phase induction motor construction before we talked about parts of the electric motor generally but on this topic, we will go deep for 3 phase induction motor construction only. Three phase induction motor construction your electrical guide. The three phase ac induction motor is a rotating electric machine that is designed to operate on three phase supply. Like any electric motor, a 3 phase induction motor has a stator and a rotor. The size of the wire is a function of the motors expected fullload current, insulation type, and rated operating temperature. The rotor will constantly be turning to align its magnetic field with that of the stator field. We arrange the three phase winding in such a manner in the slots that they produce one rotating magnetic field when we switch on the three phase ac supply source. Almost 80% of the mechanical power used by industries is provided. Single phase induction motor the single phase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. An induction motor essentially consists of two main parts. Feb 15, 2017 construction of 3 phase induction motor smile and learn. Watch this video to understand the working principals of the three phase induction motors.
Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. The principle of operation of this motor is based on the. The stator of an induction motor is in principle, the same as that of a synchronous motor or generator. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa. Jan 15, 2014 the video highlights details regarding the construction of three phase induction motor. By far the most commonly used ac motor is the induction motor.
For industrial and mining applications, 3phase ac induction motors are the prime movers for the vast majority of machines. Direct current brakes are characterized by simple construction, facility for regulating brake parameters such as braking torque, braking time, and the possibility of supplying from an alternating. The threephase induction motor is the extensively used for various kinds of industrial drives. Three phase induction motor specifications is 325 60034 1 method of determination of efficiency of rotating electrical machines is 4889 60034 2 degree of protection is 4691 60034 5 designation of method of cooling of rotating electrical machines is 6362 60034 6 type of construction and mounting arrangement for rotating. This document is highly rated by electrical engineering ee students and has been viewed 2456 times. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. Construction of squirrel cage induction motor explained. Learn a brief history of the electrical power systems construction.
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