Instructions for three phase induction motors teco. The slip ring motor has very little application in industries. Induction motors have been ruling the industrial world for many decades. Vem threephase motors with slip ring rotor combine the general benefits of this drive solution with vems extraordinary manufacturing knowhow. The rotor of the slip ring induction motor is also cylindrical or constructed of lamination. Differential equations are solved using computer simulation. Squirrel cage motors are widely used due to their rugged construction. Slip ring induction motor or wound induction motor or phase wound induction motor. In the second section, i would be throwing light on the operation and working principle of wound rotor induction motor. The induction motor are of two types based on the construction of rotor. The electrical motor plant in dessau germany is a traditional company at the site with an.
Adjusting the resistance allows control of the speedtorque characteristic of the motor. Ysalient features y robust and nonflammable construction. How are squirrel cage induction motors constructed. In this instruction manual, the arrangements for most of the electric motor are as follows. Nov 27, 2019 depending upon the type of rotor construction used the three phase induction motor are classified as. By putting resistance in series with the rotor windings, the starting current can be kept low while mainta. Y provides smooth and stepless cutting of resistance in rotor circuit of the motor, reducing starting current and increasing starting torque of slipring induction motor. We can add external variable resistance to the rotor of this type of motor. Sometimes 2 additional for shunt field terminals cabinet type and position dc field supply required.
Slip ring motors are still used in many branches of industry, and their particular properties are decisive in determining the efficiency of countless processes. Fault identification of 3phase slip ring induction motor free download as powerpoint presentation. Slip ring rotor or wound rotor or phase wound rotor. Slip measurement and control in a cone ring transmission. Threephase ac induction motors are widely used in industrial and commercial applications.
Three phase slip ring induction motor a wound rotor or slip ring motor has a 3phase winding, similar to the stator winding. Index termsac motors, bearing, failure analysis, failure. Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics. The construction of a stator is the same for both the squirrel cage and slip ring induction motor. 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. When a motor starts to rotate the slip is 100 % and the motor current is at maximum.
A slip ring can be used in any electromechanical system that. A range with uniform functional and construction features. We develop appropriate solution with characteristic lines that match precisely your specifications and demands for your application. Types, construction and principle of operation, 3 phase induction motor, general. Squirrel cage motors have a rotor with short circuited bars whereas slip ring motors have wound rotors having three windings each connected in star. The function principle and overall design of a slipring motor are similar to a. Slip ring motor manufacturer menzel provides shortterm availability and adaptation, applicationspecific requirements and worldwide logistics. The brushes are connected to the variable resistor. Carbon brush performance on slip rings mining electrical. To prevent oil vapor ingress into the motor enclosure, the inner side of bearing endshield is provided with additional motor seal. Basic construction and operating principle like most motors, an ac induction motor has a fixed. We can react very quickly due to a comprehensive stock of slip ring motors in a power range up to 15000 kw. Type of construction im 1001 im b3 type of construction im 3011 im v1 motor. We saw the construction of the squirrel cage induction motor.
These are of two types, squirrel cage and slip ring motors. When motor attains normal speed, three brushes are short circuited. The main difference between slip ring and squirrel cage induction motor is the rotor construction. Brushes are used to take connection from these slip rings at starting high external resistances are usually included to improve starting torque and reduce starting current. The construction of slip ring induction motor is quite different compared to slip ring induction motor. The stator is the same as is used with a standard squirrel cage motor. The slip ring rotor chamber has two modification openings. Aem electric motors and generators kmmpusa electric motors. Also know about the qualities of slip ring induction motors. The top countries of suppliers are germany, china, and hong kong s. This means that the state of the carbon brushes and the slip ring rotor can be monitored, and cleaning can take place. Electric motor construction of induction motors britannica. A slip ring induction motor can be started with external resistance added in its rotor circuit. The mechanical construction of the ring adjustment unit is such that a steering angle of the.
Electric motor electric motor construction of induction motors. Installation and maintenance threephase induction motors. 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 book is not a complete technical guide or manual for all types of abb. We thank you for making this choice, and would ask you to read the contents of this manual. All information and instructions in this installation and operating manual have. Typical ball bearing with insulation bushing construction drawing 69. Check leads of stator winding, slip ring leads of wound rotor machine and their locking.
Squirrel cage wound rotor with slip rings the rotating magnetic field. Slip ring induction motor construction, working, speedcontrol. One cone is connected to the combustion engine by an automated dry take off clutch. Slip and motor current are reduced when the rotor begin turning. To prevent excessive slip of the ring this mechanical system is designed in such a way that. Slip ring or woundrotor induction motors construction of squirrel cage induction motor any induction motor has a stator and a rotor. A wide variety of slip ring motor options are available to you, there are 322 suppliers who sells slip ring motor on, mainly located in asia. Slip ring induction motor have big advantage of having high starting torque compared to squirrel cage motor. Why we need to start induction motor using a starter or with one of starting methods. The construction of slip ring induction motor is quite different compared to other induction motor. Speeds can be adjusted in the case of slip ring wound rotor induction motor. Slipring induction motor connection and testing youtube.
In my previous article, we have seen about the slip ring induction motor construction and its starting methods. Slip in electrical induction motors engineering toolbox. Stator winding can be either star or delta connected depending upon the design. Learn a brief history of the electrical power systems construction. The stator frame consists of laminations of silicon steel, usually with a thickness of about 0. Slip ring motor 3 with their solid construction and special design in cast iron or steel akh slip ring motors still have a big resonance in numerous industry sectors. When inspecting a wound rotor motor and the rotor lead is the point of failure, the transient caused by a rapid restrike is a strong contender for the root cause of the failure. The slip ring or wound rotor motor is an induction machine where the rotor comprises a set of coils that are terminated in sliprings to which external impedances can be connected. Design and analysis of drive system with slip ring induction motor for electric traction in india article pdf available in international journal of power electronics and drive systems 53. The stator of slip ring induction motor is very much the same as that of the squirrel cage induction motor, but the construction. Almost 90 percentage of induction motors are squirrelcage type, because this type of rotor has the simplest and most rugged construction. These components of the motordriven reel are under voltage. The rotor winding terminals are connected to three slip rings which turn with the rotor. Some changes in the stator may be encountered when a slip ring motor is used in a cascaded system, as the supply for the slave motor.
I will tell you about the construction of wound rotor induction motor in the first section. Combinations that include additional rotary transmissions for liquids water, hydraulic oil, oil, etc. Construction, working principle there are two types of 3phase induction motor based on the type of rotor used. In either case, it is classified as a permanent magnet inductor motor. Portland slip ring induction motorsbrush holder problems and. 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. A woundrotor motor, also known as slip ring rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Depending upon the type of rotor construction used the three phase induction motor are classified as. The shortcircuit current of a small 3phase induction motor is 3 times the fullload currents. The construction of a stator for both of the kinds of three phase induction motors. The bearing oil ring maintains lubrication when forcefeed oil supply fails, allowing the motor to come safely to a standstill. Wound rotor induction motors ac motors electronics. For convenience, take off the cover plates fastened at both sides of the.
If it was not caused by an operator tapping the button, it could be a weak magnetic holding coil allowing. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements. Starting and speed control of 3phase slipring induction. This work has developed a steadystate and dynamic mathematical model of three phase slip ring induction motors with external impedance. In slip ring induction motors the rotor is wound type. Slip ring induction motor advantages disadvantages and. Construction of three phase induction motor electrical4u. Wound rotor induction motor the engineering projects. The motordriven reel is used for the winding and unwinding of a mobile. The ac slip ring or wound rotor motor is an induction machine where the stator is the same as is used with a standard squirrel cage motor, but the rotor is comprised of a set of coils that are terminated in slip rings to which external impedances can be connected. Motordriven reel frequencycontrolled conductixwampfler. Slip ring motor fundamentals brighthub engineering. Almost 90% of induction motors have squirrel cage rotors.
The slip ring induction motor is shown in the figure below. The standard program provides slip ring assemblies for power and datasignal currents with any number of poles. Wound rotor induction motors chapter ac motors pdf version. Slip ring motor conversion to vsd driven standard squirrel. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. The stator consists of 3ph winding forms wound poles that carry the supply current to induce a. Slip rings induction motor provides some advantages like provides high starting torque, low starting current and it improves the power factor. Drain the oil, take off the upper part of the bearing housing and the upper. 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. It is important to understand the design and construction of slip ring assemblies in order to properly specify and evaluate their reliability and maintenance requirements. Slip rings are made of high quality phosphorbronze and are of moulded construction.
Pdf design and analysis of drive system with slip ring. Three phase slip ring induction motor my tech info. The construction of a stator for both of the kinds of three phase induction motors is identifcal, and is discussed briefly below. The slip rings are mounted on the shaft with brushes resting on them.
What is the difference between a slip ring and a squirrel. Fault identification of 3phase slip ring induction motor. Starting of slip ring induction motor explained in an easy. A wound rotor induction motor is also known as slip ring induction motor. Motors employing this type of rotor are widely known as phasewound motors or wound motor or slip ring motors. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors. Slip ring assemblies can be either supplied as components that can. Apr 11, 2017 induction motors generally will have low starting torque compared to dc series motor. This article discusses about what is a slip ring induction motor, its construction, working, diagram, speed control, advantages. We know that the slip ring induction motor has a better starting torque when compared to a. What is the working principle of slip ring induction motor. There is no difference between squirrel cage and slip ring motors. Scribd is the worlds largest social reading and publishing site.
A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. Dc motors, ac theory, ac power, ac generators, voltage regulators, ac. You will require adobe reader to read the pdffiles. It is very commonly used in industries because it is very cheap, robust, efficient, and reliable. Vem threephase motors with slipring rotor combine the general benefits of this drive solution with vems extraordinary manufacturing knowhow. What are the applications of a slipring induction motor. Telecommunication engineering, southwest jiaotong university, china, 2005 thesis submitted for. Determine the starting torque as a percentage of fullload torque if fullload slip is 3 per cent. After understanding the basic principle of operation, it is always easier to understand the speed control of slip ring induction motors.
Inductive reactance depends on the frequency and the slip. Great care has to be taken for carbon brush contact surface seating, particularly if. The main difference in a slip ring induction motor is on the rotor construction and usage. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring. Woundrotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit. Maximum starting can be attained in the slip ring motor compared to squirrel cage motor by inserting an external resistance in each phase of the rotor circuit and cutting the resistance during starting. Compared to squirrel cage rotor the rotor construction. Some changes in the stator may be encountered when a slip ring motor is used in a cascaded system, as the supply for the slave motor is controlled by the supply. The construction of stator for any induction motor is almost the same. High reliability slip ring design for wind turbines. 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. M provides some advantages like provides high starting torque, low starting current and it improves the power factor.
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. Some changes in the stator may be encountered when a slip ring motor is used in a cascaded system, as the supply for the slave motor is controlled by the. Construction and principles of operation the slosyn motor is unique in that it has the capability of being operated as an ac synchronous, constant speed motor or as a phase switched dc stepper motor. Depending upon the type of rotor construction used the three phase induction motor are. Nov 02, 2017 dosto maine aapse share kiya hai ki slip ring motor kayse kam karta haiy ummind haiy ki ye video aapko pasand aayega app subscribe te. An operating and maintenance manual, a terminal plan and. The two ends of the loop are connected to slip rings. These motors are selfstarting and use no capacitor, start winding, centrifugal switch or other starting device. In the slip ring type,the rotor consists of three phase winding similar to that of the stator.
A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. Induction motors and transformers both im and transformer works on the principle of induced voltage transformer. The electrical motor plant in dessau germany is a traditional company at the site with. One of the advantages of the slip ring motor is that resistance may be inserted in the rotor circuit to obtain high starting torque at low starting current and then cut out to. If the 3phase slip ring induction motor is started as a normal motor with the slip rings shorted, due to low starting torque of slip ring motor, the motor will draw high current i. Diagnostics of rotor and stator problems in industrial. But how does external resistance aid in better starting characteristics. Higher maintenance of brushes and slip rings compared to squirrel cage motor. Slip ring induction motor fundamentals pnpntransistor. Type of construction im 1001 im b3 type of construction im 3011 im v1 motor shaft heigh nos of poles drive end non drive end bearing lubrication lubrication.
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