Slip ring induction motor pdf free

Users occasionally inquire as to the feasibility of converting an existing woundrotor moto. The rotor will constantly be turning to align its magnetic field with that of the stator field. This motor is much heavier than the 22kw slip ring motor and resistor bank so the crane had to be rerated as well. Rotor induction motor an overview sciencedirect topics. Wound rotor induction motors with three rotor slip rings have been used in adjustable speed drives for many years. Therefore slip ring induction motors are generally e. There are different methods of starting of 3phase slip ring induction motor. Makwana and others published three phase slip ring induction motor drive with slip power control analysis for different load torque using microsoft excel as software. Lecture 6 three phase induction motors cairo university. Slip power recovery system in three phase slip ring induction. But the rotor construction differs with respect to the type of motor.

So, this motor is used in applications like lifts, pumps, mills where we require high starting torque. Difference between squirrel cage and slip ring induction motor. In squirrel cage induction motors the rotor is simplest and most rugged in construction. In the second section, i would be throwing light on the operation and working principle of wound rotor induction motor. Slip ring induction motor working principle electrical. Maruthi prasad and others published rotor side control of high power slip. Aug 12, 2017 overhead crane slip ring motor resistance calculation electrical 1 working principle of control transformers hindi video s. In the slipring motor, the effective rotor resistance is increased by adding external resistance through the slip rings. An887, ac induction motor fundamentals microchip technology. Induction motors generally will have low starting torque compared to dc series motor. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. Slip power recovery system in three phase slip ring. Jun 05, 2018 main motor stator terminal is connected to the supply main and the slip power of main motor is fed to the stator terminals of auxiliary induction motor through slip ring as shown in figure below. When a motor starts to rotate the slip is 100 % and the motor current is at maximum.

Three phase induction motors electric motors bharat bijlee. Three phase slip ring rotor starter power diagram power diagram. Senrings shd hdsdi slip ring is a new generation product which integrates sdi signal transmission into standard capsule slip ring and widely used in hd camera and security industry. These motors are having the difference in rotor construction. The tendency of the rotor teeth to remain under the stator teeth due to direct magnetic attraction is reduced. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring. Slip ring induction motor is made up from wound rotor and squirrel cage induction motor is made up from the squirrel cage rotor. Slip rings a conductive device attached to the end of a wound rotor that conducts current to the brushes.

Fault identification of 3phase slip ring induction motor. Adjusting the resistance allows control of the speedtorque characteristic of the motor. The construction of stator of the induction motor is almost the same as other motors. The slip ring rotor was developed after a decade or so. Fault identification of 3phase slip ring induction motor free download as powerpoint presentation. The difference between the rotor speed n and the rotating magnetic flux speed n s is called slip. Figure 4 shows the torquespeed characteristics of slip ring induction motor in modified static kramer drive. Methods of speed control of induction motor electrical. Methods of speed control of induction motor electrical concepts. When it achieves near synchronous speed, dc excitation is given to the rotor, and it is pulled into. The stator of slip ring induction motor is very much the same as that of the squirrel cage induction motor, but the construction of its rotor is very much different. Overhead crane slip ring motor resistance calculation.

Hi friends, in this article i am describing the importance of slip in induction motor and hoping you will find it informative and useful. Compared to squirrel cage rotor the rotor construction is not simple. An analysis is developed for a doublecage induction motor with any number of cage or end ring faults. Effects of rotor asymmetry conference paper pdf available june 1997 with 3,082 reads how we measure reads. The induction motor slip is usually expressed as a percentage of synchronous. There are two types of rotors namely squirrel cage rotor and slip. A slip ring induction motor can be started with external resistance added in its rotor circuit. Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics.

Slip ring induction motor application slip ring induction motor provides high starting torque. In this way, the slip power of main motor is fed to the auxiliary induction motor at a frequency of f 2 s 1 f 1. The aim behind the development of the project is to limit the current at starting of motor and to develop the high starting torque. Squirrel cage induction motor vs slip ring induction motor. Ppt threephase induction motor electrical engineering ee. This is easily feasible in the case of slip ring induction motor but not in the case of squirrel. As we know the speed of induction motor, torque of induction motor, so, the speed of induction motor can be changed by changing synchronous speed or by changing the slip of induction motor and then parameter r2 and x2 are changed then torque remain constant and change in slip is affected in speed control. The torque of an induction motor is the torque produced at the rotor. They are especially suitable for heavy load inertia applications.

Woundrotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit. Free download induction motor seminar ppt, pdf report. As discussed earlier, a slip ring induction motor is an asynchronous motor, as the rotor never runs in synchronous speed with the stator poles. The motor is first started as a slip ring induction motor. How to convert a slip ring motor into squirrel cage motor. Based on type of phase supply three phase induction motor self starting in nature single phase induction motor not self starting other squirrelcage induction motor slip ring induction motor. Slip ring induction motor fundamentals pnpntransistor. The basic idea of an electric motor is to generate two magnetic fields. Thyristor, slip ring induction motor srim, stator and rotor, polyphase motor, universal.

The 3phase set of currents, each of equal magnitude and with a phase. Short out the slip rings and the motor will run just like a standard induction motor. Already since 1927, we are a global manufacturer, supplier, and distributor of large slip ring motors up to 15000 kw and,8 kv. Pdf starting and speed control of 3phase slip ring. As its name indicates stator is a stationary part of induction motor. Induction motors have been ruling the industrial world for many decades. Slip ring motor conversion to vsd driven standard squirrel cage ac motor by j van niekerk, zest weg group over a number of years slip ring motors have largely been replaced by standard squirrel cage ac induction motors, often in conjunction with ac variable speed drives vsds. Squirrel cage rotor wound type rotor or slip ring type rotor squirrel cage rotor in this type rotor as the name suggests it is a rotating part of an electrical machine, in which current is induced by transformer action from rotating magnetic field. Wound rotor induction motor the engineering projects. What are the applications of a slipring induction motor. May 15, 2018 starting a synchronous motor using slip ring induction motor. Which of the following motors is usually preferred for kiln drives. The slip ringsbrushes allow external resistors to be connected in series with the winding.

Portland slip ring induction motorsbrush holder problems. However, as it picks up speed, the conductors will be cut less rapidly. Main motor stator terminal is connected to the supply main and the slip power of main motor is fed to the stator terminals of auxiliary induction motor through slip ring as shown in figure below. Pdf rotor side control of high power slip ring induction motor. With the advent of variablefrequency solidstate power supplies, speed variation can be provided by the more reliable, less expensive squirrelcage motor. A wound rotor induction motor is also known as slip ring induction motor. Generally we all are know induction motor is most widely used motor in industrial. If the slip ring induction motor is started with all the slip rings or the rotor terminals shorted. Learn more about the construction and operation of a slip ring induction motor. The slip ring motor has very little application in industries. In this article, we will learn about squirrel cage and slip ring induction motors. For load sharing to take place automatically, the motor speed should drop considerably as the load increases and this is ensured by using a motor having a high fullload slip, say for example 10%. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed.

A slip ring in electrical engineering terms is a method of making an electrical connection through a rotating assembly. The squirrel cage induction motor is the most popular type of ac motor. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. The speed of a pair of slip ring motors can be controlled by a cascade connection, or concatenation.

The slip ring induction motor has two distinctly separate parts, one is the stator and other is the rotor. Slip ring motor conversion to vsd driven standard squirrel. Wound rotor with slip rings the rotating magnetic field. The synchronous speed of the motor is given by equation 1. I will tell you about the construction of wound rotor induction motor in the first section. Scribd is the worlds largest social reading and publishing site. Slip ring motors are normally used where additional torque is required to overcome the inertia of the. But the rotor construction differs with respect to the type which is specified above. Squirrel cage motors have a rotor with short circuited bars whereas slipring motors have wound rotors having three windings each connected in star. C series motors but this disadvantages of the induction motor can be overcome by slip ring induction motor. The slip ring rotor chamber of the ic 411 slip ring induction motor is separated by what is known as a labyrinth seal, which prevents contamination from coal dust.

The slip ring induction motors usually have a phasewound rotor. All motors comply with the following indian and international standards. Oct 10, 2016 a wound rotor induction motor is also known as slip ring induction motor. Due to this an induction motor is sometimes referred to as an asynchronous machine. The rotor terminals are connected to three slip rings which turn with the. Percent slip is a way to measure the speed performance of an induction motor. That is why such motors are known as induction motors. In an induction motor, torque is equal to the power crossing the air gap divided by the synchronous mechanical speed. Terms used in wound rotor slip the difference between a motors synchronous speed and its speed at full load. Difference between squirrel cage and slip ring induction motor on our electrical learning portal we have posted articles based on comparisons and differences. Also know about the qualities of slip ring induction motors. But how does external resistance aid in better starting characteristics.

A woundrotor motor, also known as slip ringrotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Fullload slip varies from less than 1 % in high hp motors to more than 56 % in minor hp motors. Induction motors are classified based on the type of rotor they use. In this article we are going to discuss differences between squirrel cage and slip ring induction motor. Overhead crane slip ring motor resistance calculation electrical 1 working principle of control transformers hindi video s. Rarely 5% 10% slip ring motors are used in industries because it has several disadvantages like it required. What are the advantages of slipring induction motor. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements.

Motor runs smoothly as the magnetic hum is reduced b. Mar 09, 2018 in this article, we will learn about squirrel cage and slip ring induction motors. Generally, induction motor provides low starting torque as compared to d. Number of poles, frequencies and synchronous induction motor speed. It is very commonly used in industries because it is very cheap, robust, efficient, and reliable. The resistance is gradually cutoff as the motor gains speed. Due to its continuous torque and vibration free, it is used in hospitals, studio. In this way, the slip power of main motor is fed to the. Safe area motors motors for general application cga1d standard squirrel cage tefc motors. Starting of slip ring induction motor explained in an easy.

Introduction basic principle types of 3ph induction motor construction of an i. It can improve mechanical performance, simplify system operation and eliminate damageprone wires dangling from movable joints. Slip in electrical induction motors engineering toolbox. Ball and roller bearings are used to suit heavy duty, torublefree running. Construction of squirrel cage induction motor explained. The construction of stator for any induction motor is almost the same.

Pdf three phase slip ring induction motor drive with. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring rotor, whereas in most of the other applications you. In the induction motor rotor always rotates speed less than synchronous speed. A wound rotor, has a 3phase winding similar to the stator winding. In fact, an induction motor can be treated as a rotating transformer i. In the induction motors used in lift and hoists, you. Slip ring motors are the motors of choice whenever high starting torque or low starting current are required. The difference of squirrel cage and slip ring induction motor is mainly on torque, speed, slip, resistance and reactance. Industrial bus slip rings custom slip rings fo series fiber optic slip ring. This means that the state of the carbon brushes and the slip ring rotor can be monitored, and cleaning can take place. Ss 120 x f p 120 x 60 8 900 rpm rotor speed motor slip is known, equation 2. Slip ring motor fundamentals bright hub engineering.

The construction of a stator is the same for both the squirrel cage and slip ring induction motor. Here we connect one external rheostat in series with the rotor. This type of rotor is provided with a 3phase, doublelayer, distributed winding consisting of coils used in alternators. Three phase slip ring induction motor my tech info. The rotor of the slip ring induction motor is also cylindrical or constructed of lamination. The rotor core is made up of steel laminations which have slots to accommodate formed 3single phase windings. Slip ring induction motor have big advantage of having high starting torque compared to squirrel cage motor. Pdf three phase slip ring induction motor drive with slip power. Formally, it is an electric transmission device that allows energy flow between two electrical rotating parts, such as in a motor.

Starting torque of slip ring motor and induction motor. Both common end ring and separate end ring designs are considered. The scheme is somewhat analogous to a primitive kramer system, where a dc motor is coupled to the induction motor shaft and is fed by the rectifier slip power through a diode rectifier. The slip ring rotor chamber has two modification openings. Speed control of induction motor detailed explanation. Induction motor seminar ppt, pdf report study mafia.

923 1047 1152 1431 536 799 767 362 871 1156 626 184 203 750 1617 1450 1414 807 233 462 486 69 1304 1417 1011 1040 79 693 548 1274 614 1483 1317 58 1049 1214