State the condition for maximum torque of 3phase induction motor. We can react very quickly due to a comprehensive stock of slip ring motors in a power range up to 15000 kw. Because of various advantages like low initial current, high starting torque, and improved power factor, it is used in applications that require high torque, cranes, and elevators. Dec 19, 2017 in this video you will learn connection of slip ring motor with starter panel now you can join our whatsapp group. The slip ring rotor chamber has two modification openings. A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. Ysalient features y robust and nonflammable construction.
Speed is varied with the help of external resistance, from 50% to 100% of the full speed, 4. The rotor of the slip ring induction motor is also cylindrical or constructed of lamination. Squirrel cage wound rotor with slip rings the rotating magnetic field. The basic idea of an electric motor is to generate two magnetic fields. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. Fault identification of 3phase slip ring induction motor free download as powerpoint presentation. Pdf three phase slip ring induction motor drive with slip.
Pdf three phase slip ring induction motor drive with. Write the classification of 3phase induction motor. Makwana and others published three phase slip ring induction motor drive with slip power control analysis for different. The rotor core is made up of steel laminations which have slots to accommodate formed 3single phase windings. Squirrel cage rotor wound type rotor or slip ring type rotor squirrel cage rotor in this type. With over 35 years of experience, our business development specialist will introduce you to the basics of slip rings. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. Brake test on 3 phase slip ring induction motor free download as word doc.
An induction motor is an electrical motor whic does not require external excitation of the rotor. Typical induction motor rotors the magnetic field generated in the stator induces an emf in the rotor bars. 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. As we know, the slip speed is the difference between the synchronous and rotor speed of the induction motor. Designing of three phase squirrel cage induction motor for. Advantages of three phase squirrel cage induction motor. The 3phase set of currents, each of equal magnitude and with a phase.
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. This article is devoted to slip ring induction motors. 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. The rotor winding terminals are connected to three slip rings which turn with the rotor. A 3 phase ac induction motor photoed by hordu 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. 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 construction, working and its. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. Squirrel cage motors have a rotor with short circuited bars whereas slipring motors have wound rotors having three windings each connected in star. 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. You should also make a dc measurement of stator winding linetoline resistance using a dmm. Wound rotor induction motor the engineering projects. This type of rotor is provided with a 3phase, doublelayer, distributed winding consisting of coils used in alternators. Portland slip ring induction motorsbrush holder problems and. The slip ring induction motors usually have a phasewound rotor. Also know about the qualities of slip ring induction motors. There are two types of induction motors, one with wound type rotor, also called slip ring motor and another one with squirrelcage rotor.
It is logical that the least expensive, lowest maintenance type motor should be used most often. The rotor will constantly be turning to align its magnetic field with that of the stator field. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements. Scribd is the worlds largest social reading and publishing site. Starting of slip ring induction motor explained in an easy. Noload and blocked rotor test on an induction machine aim to estimate magnetization and leakage impedance parameters of induction machine using noload and blocked rotor tests theory an induction machine in its equivalent circuit form is akin to a transformer with slip as an additional parameter. The slipspeed command is then added to electrical rotor speed to obtain the stator v f base frequency controlled rectifierac supply vvvf inverter tacho k dc vf 1 2s induction motor pi controller limiter v dc f c f s v o z r t e z z. Percent slip is a way to measure the speed performance of an induction motor. The slip rings brushes allow external resistors to be connected in series with the winding. This arrangement in slip ring induction motors also reduces the high inrush currents during the starting of an induction motor. Jul 25, 2019 squirrel cage induction motor working principle.
Record all nameplate information for the induction motor. The rotor will constantly be turning to align its magnetic field with the stator field. In the second section, i would be throwing light on the operation and working principle of wound rotor induction motor. Singlephase induction motor threephase induction motor singlephase induction motor there are probably more singlephase ac induction motors in use today than the total of all the other types put together. In turn, a current is produced in the rotor bars and shorting ring and another magnetic field is. The slip ring induction motor working in the induction principle. Slip rings a conductive device attached to the end of a wound rotor that conducts current to the brushes. The rotor and stator are separated by an air gap which allows free rotation of the rotor. I will tell you about the construction of wound rotor induction motor in the first section. Jul 16, 2018 phase wound induction motor and also slip ring motors.
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. Low starting current when compared to squirrel cage induction motors, 3. You also come to know about the law on which the motor works, the types of field induces on the rotor, and. But how does external resistance aid in better starting characteristics. What is the other name for slip ring induction motor. Feb 07, 2018 in this video, i will explain you about the working of the threephase induction motor. Fault identification of 3phase slip ring induction motor. The slip ring motor has very little application in industries. Three phase slip ring induction motor my tech info. 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.
Starting of slip ring induction motor explained in an easy manner. This work is introducing the designing of new three phase squirrel cage induction motor with an objective of getting good efficiency. Type of induction motor for ac in which the rotor has wire winding. Oct 10, 2016 a wound rotor induction motor is also known as slip ring induction motor. This rotating magnetic field induces voltages in the rotor windings and a rotor current will flow through the closed circuit, formed by the rotor winding, the slip rings, the brushes and the star connected external resistance. Slip ring motor fundamentals brighthub engineering. State the steps to draw the equivalent circuit of 3phase induction motor. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. A motor rating of 10 horse power, 415 volts with 1440 rpm and 4pole is selected for design problem and an.
Adjusting the resistance allows control of the speedtorque characteristic of the motor. Feb 20, 2014 terms used in wound rotor slip the difference between a motor s synchronous speed and its speed at full load. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Three phase slip ring induction motor drive with slip power control analysis for different load torque using microsoft excel as software tool. Working principle of a threephase induction motor rotating. In slip ring induction motors, higher starting torque can be attained by providing an external resistance in the rotor circuits during the starting period of the slip ring induction motor. When the stator winding of the slip ring motor is connected to the three phase supply, it produces a rotating magnetic field in the same way as a squirrel cage induction motor. This rotating magnetic field has a speed which is known as the synchronous speed. Another type is squirrel cage motor that has no wire winding and has no slip rings. Higher brush and slip ring maintenance required, 5. The slip ringsbrushes allow external resistors to be connected in series with the winding. As its name indicates stator is a stationary part of induction motor.
This means that the state of the carbon brushes and the slip ring rotor can be monitored, and cleaning can take place. By far the most commonly used ac motor is the induction motor. Working principle of 3 phase squirrel cage induction motor. The construction of a stator is the same for both the squirrel cage and slip ring induction motor. Noload and blocked rotor test on an induction machine aim theory.
The slip of the induction motor varies from 5 percent for small motors to 2 percent for large motors. Slip ring induction motor is one of the types of 3phase induction motor and is a wound rotor motor type. Slip ring induction motor working principle electrical mastar. A stator winding is placed in the stator of induction motor and the three phase supply is given to it. Slip ring motor manufacturer menzel provides shortterm availability and adaptation, applicationspecific requirements and worldwide logistics. As discussed earlier, a slip ring induction motor is an asynchronous motor, as the rotor never runs in synchronous speed with the stator poles.
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