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. The three phase induction motor is the extensively used for various kinds of industrial drives. The torque of the induction motor depends on the rotor resistance. Construction of three phase induction motor electrical4u. The stator of an induction motor consists of 3phase windings, which when connected to a 3phase supply creates a rotating magnetic field. There is uniform air gap between stator and rotor but no electrical connection between them. Threephase squirrelcage induction motors are widely used in industrial drives because they are rugged, reliable and economical. An induction motor is an electrical motor whic does not require external excitation of the rotor. Third international conference on advances in control and optimization of dynamical systems march 15, 2014. In operation, the nonrotating stator winding is connected to an alternating current power source. Design of a three phase squirrel cage induction motor for electric propulsion.
Squirrel cage induction motor and wound rotor induction motor. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a. Three phase induction motor 3 phase ac induction motor, the ac induction motor is a rotating electric machine designed to operate from a three phase source of alternating voltage. The stator of a single phase induction motor is wound with single phase winding. Windings are such placed that they are electrically and mechanically 120 o apart from in space. In this paper new equations are derived for the 3phase squirrelcage induction motor with space harmonics which can be used to compute dynamic characteris. Wegthreephaseinductionmotorstlinesquirrelcagerotor12364818manualenglish. The rotor consists of a rotor core, a rotor winding and a rotating shaft.
Three phase induction motors electric motors bharat bijlee. This operating manual has been created for three phase squirrel cage single and dual speed induction motors, with. Partwinding starting improvement of threephase squirrelcage induction motor. The two main methods of speed control using a robust, reliable squirrel cage induction motor are. An induction motor can therefore be made without electrical connections to the rotor. Motor manufacturing company, induction motor, three phase motor, 3 phase motor, squirrel cage induction motor, electric motor, all types of motor, vfd, roller table motors, crane duty motors, hoist duty motors, prime mover, speed variation motor, converter motor, vvvf motor, variable voltage and variable frequency motor. An induction motor s rotor can be either wound type or squirrel cage type. 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. The asynchronous machine block implements a threephase asynchronous machine wound rotor, single squirrelcage, or double squirrelcage. The rotor consists of uninsulated copper or aluminium bars called rotor conductors. W21 cast iron frame standard efficiency ie1 catalog number.
Electric motors and machines, squirrel cage ac induction motor. Firstly, i am going to tell you about the structure of squirrel cage induction motor. In squirrel cage induction motor, there is a 3 phase winding on the stator slots. The stator is a classic three phase stator with the winding.
In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. The rotor is separated from the stator by a small airgap which ranges from 0. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface. The mode of operation is dictated by the sign of the mechanical torque. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Threephase induction motor squirrel cage rotor customer. Induction motor, locked rotor torque, power factor, efficiency, genetic algorithm. Former is cheaper and broadly used as it requires less maintenance than later one. Induction motor totallyenclosed fancooled nema standard epact three phase induction motors sdesign versatility teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and. Check the reason for the unbalanced threephase power supply, if it is.
The stator has windings that produce a magnetic field, and windings on the rotor cut this field and induce a current in the rotor windings. A wound rotor or slip ring motor has a 3phase winding, similar to the stator. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Observation of no load test i o amp v o volts pin watts stator cu loss. A squirrelcage rotor is the rotating part of the common squirrelcage induction motor. 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.
An induction motors rotor can be either wound type or squirrelcage type. Therefore a new term is needed to describe the induction motor. The majority of commercial and industrial applications usually involve the use of a threephase squirrelcage induction motor. It has the stator of an induction motor, and the rotor of a dc motor. It is called a squirrel cage motor because the rotor inside of it known as a squirrel cage rotor looks like a squirrel cage. The rotor is same as that employed in 3phase squirrel cage induction motor. The new iec 60034301 defines worldwide the following efficiency classes of singlespeed threephase, cage induction motors in the 0,12 kw power range. Three phase induction motors an electric motor is a device which converts electrical energy into a mechanical energy. Pdf partwinding starting improvement of threephase squirrel. Applications of threephase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous.
The model is based on twoaxis theory of revolving frame. 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. Bharat bijlee manufactures a complete range of three phase squirrel cage induction motors. Singlephase induction motors are used extensively for smaller loads, such as. Introduction three phase induction motors are the most common and frequently encountered machines in industry simple design, rugged. A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism.
The rotor of a squirrel cage induction motor is shor. This paper deals with performance analysis and implementation of a three phase inverter fed induction motor im drive system. A threephase power supply provides a rotating magnetic field in an induction motor. Starting method for induction motors a 3phase induction motor is theoretically self starting. A 3 phase induction motor has two types based on the rotor construction, named as. The principle of working of squirrel cage and slip ring induction motor is based on faradays law of electromagnetic induction. Designing of three phase squirrel cage induction motor for. Since 1927, users around the world have been able to rely on highquality 3 phase squirrel cage induction motors made by menzel. Conference paper pdf available august 2009 with 8,072 reads. Pdf simulating multiconnection, threephase, squirrelcage. A digital phase locked loop speed control of three phase. Design of a three phase squirrel cage induction motor for electric. Mixed fault diagnosis in threephase squirrelcage induction. It is desired to install a 3phase cage induction motor restricting the maximum line current drawn from a 400 v 3phase supply to 120 a.
The three phase squirrelcage induction machine is the most used motor in industry applications. 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. These ie3 motors comply with the latest efficiency standards and requirements of is. Disassembly and assembly of motors three phase induction. So called because rotor tries to line up with the rotating magnetic field in the stator.
Set up and connections threephase induction motor noload and fullload operation threephase induction motor operation characteristics threephase induction motor direction of rotation p rocedure high voltages are present in this laboratory. For squirrel cage rotor it consists of copper bars. They are built to cope with the toughest conditions, and reliably ensure the durable availability of your industrial facilities. In this chapter, we shall focus our attention on the construction. These motors are classified as three phase induction motors, single phase induction motor, universal motors, synchronous motors etc. Lecture notes electrical machine ii bee 1401 page 1. What are the specific applications of squirrel cage and. The analysis of the 3phase squirrelcage induction motor with. Design of a three phase squirrel cage induction motor for. Model the dynamics of threephase asynchronous machine. When the stator is fed with a single phase supply, it produces alternating flux which alternates along one space axis only.
Working principle of 3 phase squirrel cage induction motor. Pdf three phase squirrel cage induction motor, conctruction. There are two types of rotors which are employed in 3 phase induction motor. This paper describes a generalized simulation model of the threephase induction motor using the simulink software package of matlab. A 3 phase induction motor has two main parts i stator and ii rotor. Menzel 3 phase squirrel cage induction motors are robust, efficient and durable. Squirrel cage induction motor the engineering projects. The closed loop control scheme of the drive utilizes the digital phase locked loop. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r.
If the motor doesnt rotate in twophase operation, find the reason for phase loss and eliminate it. In this paper fault diagnosis of induction motor under mixed fault is carried out using. Totallyenclosed fancooled nema standard epact three phase induction motors. Be careful it can hurt to tangle with a threephase motor. The threephase induction motor is the extensively used for various kinds of industrial drives. Pdf modelling of the threephase induction motor using. Squirrel cage rotor three phase induction motor the rotor core is cylindrical and slotted on its periphery. Ebrahimi, mixed fault diagnosis in threephase squirrelcage induction motor using analysis of. These windings are either star connected or in delta connected. What is squirrel cage induction speed of the motor and viceversa. 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. Alternating flux acting on a squirrel cage rotor can not produce rotation, only revolving flux can.
This will link and cut the rotor conductors which in turn will induce a current in the rotor conductors and. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. But not all the methods are suitable for all applications. Motors what we will be working on today is the disassembly and assembly of an a. Teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and other international standards. Ac induction motors are also the most common motors used in main powered home appliances. Three phase induction motors w60 line squirrel cage rotor horizontal. Normally, we use the motors in industrial drives because they are rugged, reliable and economical. Cage induction machines institut fur elektrische energiewandlung. They are found everywhere from a small workshop to a large. In this paper, considerations on the simulation of singlespeed, multiconnection or multiflux level, threephase, squirrelcage, induction motors using the.
1503 1409 1169 665 877 1135 1334 1059 1266 202 294 887 541 423 747 323 236 264 961 1447 786 1047 1622 440 394 1618 1245 1533 1429 1516 654 775 1041 783 682 1464 282 362 351 1370 1322