In the slip ring motor, the windings on the rotor are terminated to three insulated slip. We can react very quickly due to a comprehensive stock of slip ring motors in a power range up to 15000 kw. Pdf three phase slip ring induction motor drive with. Slip ring induction motor application slip ring induction motor provides high starting torque. Normally, we use the motors in industrial drives because they are rugged, reliable and economical. Fault identification of 3 phase slip ring induction motor free download as powerpoint presentation. Fullload slip varies from less than 1 % in high hp motors to more than 56 % in minor hp motors. Threephase induction motor protection systems and its. In the squirrelcage induction motor, the rotor has very low fixed resistance, therefore, the starting torque is low due to low power factor and high reactance.
The aim behind the development of the project is to limit the current at starting of motor and to develop the high starting torque. If there are obvious signs of knocks, contact the carrier you may able to claim on their insurance and after a. Number of poles, frequencies and synchronous induction motor speed. Types, construction and principle of operation, 3 phase induction motor, general. 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.
When the motor is started the total external resistance get added in the rotor winding resistance and the value of the resistances get gradually decreased with th. In squirrel cage induction motor, there is a 3 phase. This article is devoted to slip ring induction motors. An induction motor im is an ac machine which finds its extensive use in the field of industrial and commercial areas. What happens if slip rings are short circuited in a 3. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. Telecommunication engineering, southwest jiaotong university, china, 2005 thesis submitted for the degree of masters of engineering science in school of electrical and electronic engineering the university of adelaide, australia august 2010. The rotor winding terminals are connected to three slip rings which turn with the rotor. Slipring modular motors from abb, availability for heavy load inertia applications english pdf leaflet technical note. Slip ring motor fundamentals brighthub engineering.
The frequency of rotor induced emf of 400v, three phase, six pole induction motor is 2hz. Working principle of 3 phase squirrel cage induction motor. Hence slip ring motors are used where one or more of the above requirements are to be met. Torque slip characteristics in three phase induction motor as the induction motor is located from no load to full load, its speed decreases hence slip increases. Read online 3 phase tefv induction motors slip ring or cage type book pdf free download link book now. Carbon brush performance on slip rings mining electrical. Download 3 phase tefv induction motors slip ring or cage type book pdf free download link or read online here in pdf. Three phase induction motor consists of a stator and a rotor, and there is no electrical connection between these two.
An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding. Slip ring we can change the starting torque by simply varying the external resistance connected to rotor, this is not possible in case of squirrel cage induction motor, although squirrel cage is easy to maintain and cost effective as compared to slip ring as it has slip rings,brushes. Induction motor and different speed control methods page no 3. Find the percentage slip and number of poles of the induction motor. It is very commonly used in industries because it is very cheap, robust, efficient, and reliable. Low and high voltage three phase induction motors m line squirrel cage rotor. Fault identification of 3phase slip ring induction motor. 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. Learn more about the construction and operation of a slip ring induction motor. Slip ring induction motor or wound induction motor or phase wound induction motor.
Single phase induction motor three phase induction motor single phase induction motor there are probably more single phase ac induction motors in use today than the total of all the other types put together. Home category electrical engineering mcq questions and answers 3 phase induction motors. Torqueslip characteristics in three phase induction motor. Induction motor may be of single phase or three phase, or may be squirrel cage or slip ring type depending upon rotor structure. Squirrel cage wound rotor with slip rings the rotating magnetic field. Explain with neat diagram the static rotor resistance. Generally, induction motor provides low starting torque as compared to d. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. 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 rotor of the slip ring induction motor is connected to the external resistances.
Slip ring motor manufacturer menzel provides shortterm availability and adaptation, applicationspecific requirements and worldwide logistics. Be specially designed for energy saving purpose which is totally enclosed and fancooled type. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements. The construction of a stator for both of the kinds of three phase induction motors is identifcal, and is discussed briefly below. Wound rotor induction motor variable speed three phase windings in stator rotating magnetic field three phase windings in rotor three phase variable frequency current induced in rotor rotor current brought out to variable resistanceelectronic controls through brushes on three slip rings to control speed.
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. Usually slip ring ims are preferred because of its advantages over squirrel cage ims. A 3 phase induction motor can be used for different applications with various speed and load requirements. 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. C series motors but this disadvantages of the induction motor can be overcome by slip ring induction motor. In previous articles i have discussed the construction, operation, starting, speed control, and classes of squirrel cage induction motors. Construction of three phase induction motor electrical4u. This work has developed a steadystate and dynamic mathematical model of three phase slipring induction motors with external impedance. Free download induction motor seminar ppt, pdf report. A slip ring, three phase induction motor rotates at a speed of 1440rpm, when a supply of 400v, 50hz is applied across the stator terminals.
Brake test on 3 phase slip ring induction motor free download as word doc. Diagnostics of rotor and stator problems in industrial. The stator is the outer component of the motor which can be seen. These motors are squirrel and slip ring type induction motors. Abb slipring modular motors abb high voltage induction. Low and high voltage three phase induction motors slip ring rotor fixed brushholderm line date. Foundation design for high voltage induction motors english pdf leaflet. Differential equations are solved using computer simulation. Depending upon the type of rotor construction used the three phase induction motor are classified as.
Three phase slip ring induction motor my tech info. The slip ring motors in our mebsgr series that are described in the following text are in the ic 411 cooling class, known as surfacecooled or ribbedcooled. It is logical that the least expensive, lowest maintenance type motor. Slip ring induction motor fundamentals pnpntransistor. Speed control of three phase slip ring induction motor by rotor resistance control. The resistance of the squirrelcage induction motor can not be varied as compared to the slip ring induction motor. The slip rings brushes allow external resistors to be connected in series with the winding. The slip ring motor has very little application in industries. Slip ring induction motor is made up from wound rotor and squirrel cage induction motor is made up from the squirrel cage rotor. Slip ring induction motor advantages disadvantages and. Search weglowandhighvoltagethree phase slip ring rotorvertical11734748manualenglish. Per phase equivalent circuit motor slip r 1 and r 2.
Good performance, such as high safety, energy saving, compact design, low noise, little vibration, high torque big breakaway torque, reliable operation, stable running and convenient maintenance. So, this motor is used in applications like lifts, pumps, mills where we require high starting torque. There are different methods of starting of 3 phase slip ring induction motor. A stator is in all the motor only winding on the stator is vary with types of motor. When a motor starts to rotate the slip is 100 % and the motor current is at maximum. These stator and rotors are made up of highmagnetic core materials with less hysteresis and eddy current losses. High voltage motors for the mining industry english pdf leaflet product note. Squirrelcage rotor almost 90 per cent of induction motors are squirrelcage type, because this type of rotor has the simplest and most rugged construction imaginable and is almost indestructible. Induction motor seminar ppt, pdf report study mafia. Speeds can be adjusted in the case of slip ring wound rotor induction motor by inserting an resistance. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed.
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