There are two major components of an ac induction motor. Working of 3 phase induction motor is explained in this video with help of animation. Synchronous motors are special types of motors used in constant speed applications, whereas most of the motors used in the industrial applications are of induction type. The rx series provides more than just solid state overload or power protection relays. In the case of three phase ac alternating current operation, the most widely used motor is a 3 phase induction motor, as this type of motor does not require an additional starting device. The induction motor cannot make a quickreversal run because of the torque acting in the opposite direction. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Simulation of 3ph induction motor in matlab with direct. One singlephase wattmeter plus miscellaneous apparatus as needed. Designing of three phase squirrel cage induction motor for. Speed control of 3phase induction motor using pic18 microcontrollers. Estimating parameters of a threephase induction motor.
Differentiate between the various types of generating electric power stations. The three phase induction motor is the most widely used electrical motor. The power drawn from the rotor terminals could be spent more usefully. A 3 phase induction motor can be used for different applications with various speed and load requirements. Induction motor works on the principle of electromagnetic induction. Induction motors p3 typical torquespeed and powerspeed curves for a 4pole induction motor torque power p these curves are greatly affected by the rotor resistance r2 in our model. Estimating parameters of a threephase induction motor using matlabsimulink k. When three phase supply is given to the stator winding, a rotating magnetic field of constant magnetic field is produced.
This induces an electric field in a coil or squirrel cage to drive a rotor. Three phase induction motors used in explosive atmospheres w60 line squirrel. Therefore stop the induction motor once, change the wire connections and make a reverse run. Three phase induction motors used in explosive atmospheres w60 line squirrel cage rotor horizontal date. This article concentrates only on threephase induction motor and its protection. Methods of starting three phase induction motors as we know, once a supply is connected to a three phase induction motor a rotating magnetic field will be set up in the stator, this will link and cut the rotor bars which in turn will induce rotor. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Search wegthreephaseinductionmotorsmasterline50019089brochureenglish. Threephase induction motor ac compact drives 1ph722 operating instructions edition 032008. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. The 3 phase set of currents, each of equal magnitude and with a phase.
Threephase induction motor operating instructions 1ph722. An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An843, speed control of 3phase induction motor using. There are two basic reasons for the use of singlephase motors rather than 3phase motors. In the figure we can see three identical moc opto coupler stages configured in their standard triac regulator mode, and the input side integrated with a simple ic 555 pwm circuit.
Because it is a capacitortype induction motor, it has a high power factor and runs with a low noise level caution. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. List and describe the more commonly used equipment in an electric substation. The speed of rotating magnetic field is synchronous speed, n s r. Threephase or polyphase motors are of mainly two types. Construction of three phase induction motor electrical4u. The model has been analyzed, by utilizing a commercially available package, using the finite element method fem where nonlinear magnetic characteristics were taken into account. The frequency and speed of the motor, with respect to the input supply, is called the synchronous frequency and synchronous speed. Here basic operation principle of an induction motor is. The induction motor has two sets of windings copper or aluminum wire coiled to form electromagnets. The threephase induction motor is the extensively used for various kinds of industrial drives. This paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines construction and the testing process of a working. The alternating current ac induction motor is one of the most rugged and most widely used machines in industry.
Tecowestinghouse motor company po box 227 786800277 5100 n. Ac induction motors are also the most common motors used in main powered home appliances. Apart from using the heat generated in meaning full ways, the slip ring output could be connected to another induction machine. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction. Scribd is the worlds largest social reading and publishing site. Safety guidelines this manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. The rotor of an induction motor can be a squirrel cage rotor or wound. An electrical motor is a device that has brought about one of the biggest advancements in the fields of engineering and technology ever since the invention. An843 ds00843apage 2 2002 microchip technology inc.
Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, the absence of commutator and good speed regulation. Isbn 9789535122074, pdf isbn 9789535163992, published 20151118. The rotor will constantly be turning to align its magnetic field with that of the stator field. Induction motors applications, control and fault diagnostics. Cascade control speed control of three phase induction. The induction motor model is created according to a group of standard equations current, voltage, power, efficiency, speed 1, p 388 or 2, p 167p 200 and values developed and edited in the laboratory. Principle operation of three phase induction motor the figure shows the portion of a three phase induction motor and is principle explained below. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. An electrical motor is an electromechanical device which converts electrical energy into mechanical energy. Starting method for induction motors a 3 phase induction motor is theoretically self starting. The induction motor is made up of the stator, or stationary windings, and the rotor.
The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field. Induction motor totallyenclosed fancooled nema standard epact three phase induction motors sdesign versatility teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and. 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. Principle operation of three phase induction motor my. An induction motor can therefore be made without electrical connections to the rotor.
In this work a conventional three phase squirrelcage type induction motor with specifications 10 hp, 415v, stardelta connected and 4 poles is chosen for comparison with our motor, which is designed for good efficiency. 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 basic idea of an electric motor is to generate two magnetic fields. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Record all nameplate information for the induction motor. Induction motors the singlephase induction motor is the most frequently used motor in the world most appliances, such as washing machines and refrigerators, use a singlephase induction machine highly reliable and economical figure 1 singlephase induction motor. Here too we use an identical method for enforcing the proposed 3 phase induction motor speed controller circuit, the following image shows how this can be done. The self and mutual inductances of the motor are calculated using 2d model for the induction motor. Induction motor driving a centrifugal compressor advantages. This will link and cut the rotor conductors which in turn will induce a current in the rotor conductors and. 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 singlephase motor stator has a laminated iron core with two windings arranged perpendicularly. Threephase induction motor protection systems and its. Single phase induction motor the singlephase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. The motor with national specifications is of heatproof class 120 e. The induction motor cannot make a quickreversal run because of. Induction motors horizontal and vertical weg electric machinery, wem, induction motors have been specifically designed and manufactured for the most severe industrial applications, such as heavy duty fans, pumps, refiners, compressors, crushers and grinding mill drives. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. You should also make a dc measurement of stator winding linetoline resistance. You should also make a dc measurement of stator winding linetoline resistance using a dmm. The difference in speed between rotor, the synchronous speed and the rotating. When the windings in the stator are energized it induces current in the windings in the rotor this invisible force is call induction, learn about the concept of induction here. For the induction motor, the steady state motoring region is restricted from 80% of the rated speed to 100% of the rated speed due to the fixed supply frequency and the number of poles.
The notices referring to your personal safety are highlighted in the manual by a safety alert. Induction induction motors derive their name from the fact that current is induced into the rotor windings without any physical connection with the stator windings which are directly connected to an ac power supply. The three phase stator winding gets energized when a three phase supply is given to the stator winding, a rotating magnetic field is produced which revolves round the stator its synchronous speed n. By using features previously found only in large expensive motor protection relays, the rx series allows even small to medium sized motor applications to be protected by the best technology available, yet at a price affordable to all. Pdf construction of three phase linear induction motor. When an induction motor starts, it will draw very high inrush current due to the absence of the back emf at start.
1487 904 1084 470 1559 751 698 156 1427 506 671 730 1306 134 443 449 850 416 870 1452 182 1114 1446 252 1323 564 757 1102 923 71 893 320