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  • Three phase induction motor: construction | Engineering ...

    Aug 06, 2020· There are mainly two types of rotor employed in 3-phase induction motors: Squirrel cage Rotor; Wound Rotor; 1.Squirrel cage Rotor: Almost 90 percent of induction motors are provided with squirrel cage rotor because of its very simple,robust and almost instructible construction cage construction,copper,brass or aluminium bars are placed as the rotor conductors,parallel or

  • What is Cogging in Induction Motor? - Magnetic Locking ...

    The phenomenon of Magnetic Locking between the stator and the rotor teeth is called Cogging or Teeth Locking.Even after applying full voltage to the stator winding, the rotor of a 3 phase induction motor fails to start. This condition arises when the number of stator and rotor

  • INDUCTION MOTOR TESTS

    The slip of the induction motor at no-load is very low. Thus, the value of the equivalent resistance in the rotor branch of the equivalent circuit is very high. The no-load rotor current is then negligible and the rotor branch of the equivalent circuit can be neglected. The approximate equivalent circuit for the no-load test becomes Induction ...

  • Construction of induction motor, stater and rotor of ...

    Feb 27, 2017· Those induction motors which employ squirrel cage rotor are called squirrel cage induction motors. Most of 3-phase induction motors use squirrel cage rotor as it has a remarkably simple and robust construction enabling it to operate in the most adverse circumstances. However, it suffers from the disadvantage of a low starting torque.

  • What is a Wound Rotor Motor and How Does it Work?

    May 28, 2021· The specifications for a wound rotor motor involves understanding the specifications for all induction motors, which can be reviewed in our article all about induction motors. This article will highlight the important concepts for wound rotor motors that must be understood before purchasing one of these but know it is not all-inclusive.

  • ELECTRICAL MACHINE-II

    The rotor of the slip ring induction motor is also cylindrical or constructed of lamination. Squirrel cage motors have a rotor with short circuited bars whereas slipring motors have wound rotors having "three windings" each connected in star. The winding is made of copper wire. The terminals of the rotor windings of the slipring motors

  • 3-Phase Induction Motors

    The basic idea of an electric motor is to generate two magnetic fields: rotor magnetic field and stator magnetic field and make the stator field rotating. The rotor will constantly be turning to align its magnetic field with that of the stator field. The 3-phase set of currents, each of equal magnitude and with a phase

  • Wound Rotor Induction Motors | AC Motors | Electronics ...

    A wound rotor induction motor has a stator like a squirrel cage induction motor, but a rotor with insulated windings brought out via slip rings and brushes.. However, no power is applied to the slip rings. Their sole purpose is to allow resistance to be placed in series with the rotor

  • UNIT 3. INDUCTION MOTORS - Erode Sengunthar

    The induction motor with a cage was invented by Mikhail Dolivo-Dobrovolsky about a year later in Europe. Technological development in the field has improved to where a 100 hp (74.6 kW) motor from 1976 takes the same volume as a 7.5 hp (5.5 kW) motor did in 1897. Currently, the most common induction motor is the cage rotor motor.

  • 22 Difference between Squirrel Cage and Slip Ring (Wound ...

    Feb 05, 2021· In 3 phase squirrel cage induction motor, the rotor resistance starter is not used. In 3 phase slip ring induction motor, the rotor resistance starter is used. 17: Torque Operation: When low starting torque is required, the squirrel cage motor is used. When high starting torque is required, the slip ring motor is used. 18: Cooling System

  • Wound Rotor - TECO-Westinghouse Motor Company, a

    Wound Rotor Induction Motor Applications How It Works Wound rotor motors are an extremely versatile breed of induction motors. Featuring a rugged design, these machines provide the unique ability to gradually bring up to speed high-inertia equipment and large loads smoothly and easily. Wound rotor motors also can develop high starting

  • induction motor seminar - Grainger CEME

    Jul 09, 2019· If the rotor of an induction motor travel exactly in step with the stator created field, then the flux looks to be at stand still when viewed from the rotor. If this is the case then no voltage / current can be induced in the rotor

  • Induction motor:Rotor E.M.F. and Reactance Under Running ...

    Rotor E.M.F. and Reactance Under Running Conditions. Let . E2 = standstill rotor induced e.m.f./phase. X2 = standstill rotor reactance/phase, f2 = rotor current frequency at standstill. When rotor is stationary i.e. s = 1, the frequency of rotor e.m.f. is the same as that of the stator supply frequency.The value of e.m.f. induced in the rotor at standstill is maximum because the relative speed ...

  • Induction Motor Parameter Measurement

    The primary advantage of the induction motor is it's straightforward rotor construction leading to low-cost, ruggedness, an-maintenance d low requirement. Induction motor model . As with other electrical machines, an equivalent electric circuit can be developed for the purpose of gaining insight into the motors operation. The per-phase ...

  • Design of Rotor - Induction Motors - BrainKart

    In case slip ring induction motors the rotor complex in construction and costlier with the advantage that they have the better starting torque. This type of rotor consists of star connected distributed three phase windings. Between stator and rotor is the air gap which is a very critical part. The performance parameters of the motor like ...

  • INDUCTION MOTOR

    1246 Electrical Technology (b) Rotor(i) Squirrel-cage rotor: Motors employing this type of rotor are known as squirrel-cage inductionmotors. (ii) Phase-wound or wound rotor: Motors employing this type of rotor are variously known asphase-wound motors or wound motors or as slip-ring motors. 34.4. Squirrel-cage Rotor Almost 90 per cent of induction motors are squirrel-cage type ...

  • 3-Phase Induction Motors

    The basic idea of an electric motor is to generate two magnetic fields: rotor magnetic field and stator magnetic field and make the stator field rotating. The rotor will constantly be turning to align its magnetic field with that of the stator field. The 3-phase set of currents, each of equal magnitude and with a phase

  • The Polyphase Induction Motor

    Fig. 1. Physical construction of the squirrel-cage induction motor: (a) cross section showing stator and rotor, (b) rotor construction. 1. Basic operation of the induction motor As previously shown, the phase displacement between the voltages applied to the stator windings produces a travelling MMF or rotating magnetic field in the uniform air gap.

  • Noise in induction motors-causes and treatments

    induction motor are the fans and the rotor bars in the vents areas and at the rotor ends. Open Motors: These have a free exchange of internal and external air as shown in Figs. 1 and 2. The numbers on the figure refer to the parts of the motor: 1) Extended rotor bars, 2) rotor end rings, 3) rotor laminations, 4) rotor

  • Lesson 15: Induction Motor Testing: Lock-Rotor and No-load ...

    Lock-Rotor and No-load Tests ET 332b Ac Motors, Generators and Power Systems Lesson 15_et332b.pptx 1 Learning Objectives Lesson 15_et332b.pptx 2 After this presentation you will be able to: Conduct locked rotor tests on 3-phase induction motors Conduct no-load tests on 3-phase induction motors Use measurements from lock rotor and no-load tests to

  • INDUCTION MOTOR THEORY - PDHonline

    The rotor in an induction motor can not turn at the synchronous speed. In order to induce an EMF in the rotor, the rotor must move slower than the SS. If the rotor were to somehow turn at SS, the EMF could not be induced in the rotor and therefore the rotor would stop. However, if the rotor stopped or even if it slowed significantly, an EMF

  • Wound Rotor Induction Motor: What is it? (Diagram & Speed ...

    Mar 01, 2021· A slip ring induction motor or wound rotor induction motor is used to provide high starting torque to unloading the coal in a coal handling power plant. A wound rotor induction motor is used where starting current is too high as compared to the capacity of the power system.

  • Appendix B Parameters of Induction Motors

    Rotor resistance referred to stator Rr ¼1.991O/ph Rotor leakage reactance referred to stator Xlr ¼1.073O/ph Magnetizing reactance Xm¼1.029O/ph Moment of inertia of the rotor JM¼0.05kgm 2 Table B.3 Motor 3 (Bodine Electric Company model 295). Type three-phase, wye-connected, squirrel-cage induction motor Rated power kWrat¼0.147kW

  • FläktGroup - Basic Principles of AC induction motors

    Jul 29, 2020· Next: Motors Basic Part Two: AC induction motors, permanent magnet AC motors and motor ratings Because the voltage in the Rotor bars is generated by the magnetic field in the Stator cutting through the Rotor bars, if the Rotor rotates at a synchronous speed, there will be no relative movement between the Rotor bars and the Stator magnetic field ...

  • Chapter 2 Induction Motor and Faults

    Induction motors are simpler, cheaper, and efficient. Among them squirrel-cage induction motor is more rugged and work more efficiently compared to wound-rotor induction motor. If supply voltage and frequency are constant, then a squirrel-cage induction motor runs at a constant speed which makes it suitable for use in constant speed drive [1, 2].

  • Design of Rotor - Induction Motors - BrainKart

    In case slip ring induction motors the rotor complex in construction and costlier with the advantage that they have the better starting torque. This type of rotor consists of star connected distributed three phase windings. Between stator and rotor is the air gap which is a very critical part. The performance parameters of the motor like ...

  • AN887, AC Induction Motor Fundamentals

    induction motors, the rotor is the squirrel cage type. The single-phase induction motor is not self-starting. When the motor is connected to a single-phase power supply, the main winding carries an alternating current. This current produces a pulsating magnetic field. Due

  • Induction Motor - an overview | ScienceDirect Topics

    29.5.2.2 Slip-Ring (Wound-rotor) Induction Motor Drive. Wound-rotor induction motors with three rotor slip rings have been used in adjustable speed drives for many years. In an induction motor, torque is equal to the power crossing the air gap divided by the synchronous mechanical speed.

  • Induction motor:Why Does the Rotor Rotate ? | electric ...

    The reason why the rotor of an induction motor is set into rotation is as follow: When the 3-phase stator windings, are fed by a 3-phase supply then, as seen from above, a magnetic flux of constant magnitude, but rotating at synchronous speed, is set up. The flux passes through the air-gap, sweeps past the rotor surface and so cuts the rotor ...

  • Squirrel Cage Induction Motor: Working Principle ...

    Jan 08, 2019· The main difference between slip ring and squirrel cage induction motor is the rotor construction. Motors have main two parts in construction: stator and rotor. In these motor, the rotor is squirrel cage type. This rotor is made up from parallel aluminum or copper bars. Rotor conductor bars are short-circuited with two end rings.

  • What is an Induction Motor? Principle, Working, Types and ...

    Sep 04, 2019· Balanced current should flow in all three windings. Working of Induction Motor. When a three-phase supply is given to the stator winding of the motor an RMF will be developed at synchronous speed (N s).This developed RMF will revolve inside the air gap provided between the stator and rotor.

  • How does an Induction Electric Motor's Rotor work?

    Jul 28, 2016· If the motors load is increased the motors speed will decrease. Decrease the load and the motor will increase in speed. An in­duction motor will never reach synchronous speed due to friction and windage losses. The difference between synchronous speed and induction rotor

  • Introduction to Induction Motor - The Engineering Knowledge

    Sep 29, 2019· There are 2 main types of the induction motor according to the construction of the rotor of the motor, first one is the squirrel cage motor because its rotor structure is like the squirrel and 2 nd wound rotor motor.; In industries, homes or for power generation purposes the 3-phase squirrel induction motor is mostly used, due to its reliability, less cost, and self-stating property.

  • Motors and Drives | AC induction motor slip What it is and ...

    Nov 15, 2002· The traditional way to control wound-rotor-induction-motor speed is to increase slip by adding resistance in the rotor circuit. The slip of low-hp motors is higher than that of high-hp motors because rotor-winding resistance is greater in smaller motors. As seen in Table 1, smaller and lower-speed motors are associated with higher relative slip.

  • Types and Amazing Applications of Induction Motor

    Jun 04, 2020· An induction motor is a generally used AC electric 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 rotor of an induction motor can be a squirrel cage rotor or wound type rotor.

  • How does an induction motor work?

    Sep 26, 2019· In fact, about 50 percent of global electric power consumption is due to induction motors. Lets get into the workings of induction motors, or more specifically, into Nikola Teslas genius thinking. Parts of an induction motor. An induction motor has 2 main parts; the Stator and Rotor

  • Electrical Machines - Induction Motor Equivalent Circuit

    Fig. 3. Induction Motor per-phase equivalent circuit. In the above circuit \(R_2=a_{eff}^{2}R_R\), is the rotor resistance referred to the stator \(X_2=a_{eff}^{2}X_{R0}\), is the rotor leakage reactance referred to the stator; The symbols used in induction machine models vary depending on the text and the context in which the circuit is being ...