The rotor is separated from the stator by a small airgap which ranges from 0. 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. Construction of three phase induction motor electrical4u. Watch this video to understand the working principals of the three phase induction motors. Know about the most popular and almost unbreakable construction of squirrel cage induction motor. By far the most commonly used ac motor is the induction motor. 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. Today, i am going to tell you about a wound rotor induction motor, which is also a type of 3 phase induction motor. Advantages and disadvantages of 3 phase induction motors. This 3 phase motor is also called as an asynchronous motor. Instructions for the installation, operation and maintenance of elektrim three phase induction brake motors 143t286t frame.
The text that was researched and compiled contains explanations of. The 3phase set of currents, each of equal magnitude and with a phase. Y2 series 3 phase induction motors are characterized with. The stator carries a 3 phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding.
This induces an electric field in a coil or squirrel cage to drive a rotor. 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. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. Construction of squirrel cage induction motor explained. Construction and working of 3 phase induction motor on ship. 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. For industrial and mining applications, 3phase ac induction motors are the prime movers for the vast majority of machines. 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.
Basic construction of 3phase ac induction motors you. Design of a three phase squirrel cage induction motor for. Oct 10, 2016 hi friends, i hope you are fine and having fun. They run at a constant speed from noload to the full load.
A lim operates under the same principles as its ac rotary motor counterpart, typically powered by a three phase voltage scheme with a. Construction of induction motor the three phase induction motor is a preferable type of motor. The stator of an induction motor is in principle, the same as that of a synchronous motor or generator. The major difference between them is that transformer is static in nature i. Three phase squirrelcage induction motors are widely used as industrial drives because they are selfstarting, reliable and economical. There are two types of 3phase induction motor based on the type of rotor used. The size of the wire is a function of the motors expected fullload current, insulation type, and rated operating temperature. 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. Three phase induction motor construction electrical academia. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. 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. An induction motor essentially consists of two main parts. Threephase induction motor operating instructions 1ph722.
Basic construction of 3phase ac induction motors you should. Starting method for induction motors a 3 phase induction motor is theoretically self starting. Designing of three phase squirrel cage induction motor for. The stator carries a 3 phase winding and is fed from a 3 phase supply. The topic lies under the basic electrical and electronics engineering course that. Those induction motors which employ squirrel cage rotor are called squirrel cage induction motors. These stator and rotors are constructed with the use of highmagnetic core materials in order to reduce hysteresis and eddy current losses. Starting of 3 phase induction motors, high starting torque motors, speed control. As in the synchronous motor, applying three phase currents to the armature creates a synchronously rotating magnetic field. 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.
We saw the construction of the squirrel cage induction motor. These motors can be operated either directly from the mains or from adjustable variable frequency drives. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field. Ppt threephase induction motor electrical engineering ee. Record all nameplate information for the induction motor. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Like any electric motor, a 3 phase induction motor has a stator and a rotor.
Single phase induction motors are used extensively for smaller loads, such as household appliances like fans. Parida department of electrical engineering national institute of technology, silchar,assam, india email. Differentiate between the various types of generating electric power stations. 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. The single phase motor stator has a laminated iron core with two windings arranged perpendicularly. Know about the different winding slots, lamination of the stator and its construction. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Only the stator winding is fed from the 3 phase supply. 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. This rotor is made up from parallel aluminum or copper bars. 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. Jan 15, 2014 the video highlights details regarding the construction of three phase induction motor. This document is highly rated by electrical engineering ee students and has been viewed 2456 times.
There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. The 3 phase set of currents, each of equal magnitude and with a phase. 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. The induction motor rotor is a completely shortcircuited conductive cage. The three phase squirrelcage induction motor can, and many times does, have the same armature stator winding as the three phase synchronous motor. Construction of 3phase induction motor polytechnic hub. The principle of operation of this motor is based on the. 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. An induction motor can therefore be made without electrical connections to the rotor. The stator separate from rotor by small air gap have ranges from 0. The three phase ac induction motor is a rotating electric machine that is designed to operate on three phase supply. 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.
These three phase motors consist of a stator and a rotor and between which no electrical connection exists. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Hysteresis motor a hysteresis motor is a synchronous motor with a uniform air gap and without dc excitation. One single phase wattmeter plus miscellaneous apparatus as needed. List and describe the more commonly used equipment in an electric substation. 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.
The difference in speed between rotor, the synchronous speed and the rotating. An induction motors rotor can be either wound type or squirrelcage type. However, it suffers from the disadvantage of a low starting torque. The basic idea of an electric motor is to generate two magnetic fields. A 3 phase induction motor has two main parts i stator and ii rotor.
It is also called asynchronous motor because it does not run at a synchronous speed. 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. 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. This article explains the construction, working principle of single phase induction motors. 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. The design of y2 series induction motor absorbed the advanced technology of electric motors around the world. Ppt threephase induction motor electrical engineering. The torque in a hysteresis motor is produced due to hysteresis and eddy current induced in the rotor by. Conversion of electrical power into mechanical power takes place in the rotating part of an electric motor. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. The rotor will constantly be turning to align its magnetic field with that of the stator field. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors.
It is mostly used in industrial drives because it is very reasonable and vigorous, economical and reliable. Nov 27, 2019 an electrical motor is an electromechanical device which converts electrical energy into mechanical energy. 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. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. They have very simple and rugged almost unbreakable construction. Induction motors are by ac switchboard and it is a. Feb 15, 2017 construction of 3 phase induction motor smile and learn.
Apr 07, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. 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. The video tutorial is essentially a part of the basic electrical and electronics engineering. Ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. You should also make a dc measurement of stator winding linetoline resistance. 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. 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. Wound rotor induction motor the engineering projects.
In my last article, we have discussed squirrel cage induction motor which is a type of 3 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. Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. 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. A three phase induction motor runs on a three phase ac supply. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. 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. Construction, working, torque speed characteristic and application. Stator and winding of a threephase induction motor. A single phase induction motor is inherently not selfstaring can be shown easily. Ac induction motors are also the most common motors used in main powered home appliances. Learn a brief history of the electrical power systems construction.