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It supplies an induction motor ich has a full load speed of 144wh 0 rpm. Dynamometer 5/10 A, 150/300/600 V 2 4. a. Ammeter MI (Panel type) 5 A 1 2. Numerical Problems Induction Motors. Record all nameplate information for the induction motor. Perform NO LOAD and BLOCK ROTOR Test on 3 phase induction motor. Find the. 3 - Phase Induction Motors - Electrical Engineering (MCQ) questions and answers. per phase. Home; Electrical Theory. The windage and friction loss of the motor is 750 W. Determine the: 1) Mechanical power developed, 2) Air gap power, 3) Rotor cooper loss. The shaft output of a three-phase 60- Hz induction motor is 80 KW. The aim of this work focused on numerical relay based protection of three phase induction ... proposed and implemented. Numerical Problems Induction Motors.pdf. When the 3-phase winding suitably wound on the stator is supplied with 3-phase balanced ac supply, a uniformly rotating magnetic field of constant magnitude and rotating at synchronous speed is produced. Uploaded by. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Seek to answer the following questions: 1. Watts (ii) 0.204, 23400 w, No load test: 220 volts, 4.35 amps, 244 watts, Short circuit test: Voltage of 220 volts produces a current of 64.5 Amps; Resistance per. The full, load speed of the motor is 1460 rpm. Advantages of 3 phase induction motor â¢ Generally easy to build and cheaper than corresponding dc or synchronous motors â¢ Induction motor is robust A 3-phase induction motor mainly consists of two major parts, the stator and the rotor separated by a uniform air gap. â¢ The 3-phase set of currents, each of equal magnitude and with a phase ÄµÄàÑ lW2z%ÖD/Xûl÷¾ó}´ï ÖkSCÉvªp'Ù 2t@6À{ëx ÏpiÚáë¬¤*ãW. Aluminium. â¢ The three-phase induction motor is the extensively used for various kinds of industrial drives. Initial Data . A 3 phase induction motor can be used for different applications with various speed and load requirements. (ii). There are basically 4 problems that the motor Numerical Problems Induction Motors . The rotor resistance and stand still reactance per, (ii) Induced emf per phase in rotor at stand, (iv) rotor impedance per phase at full load, Rotor current per phase = 1.382/0.1077 = 12.83 amps, A three phase slip ring induction motor has a star connected rotor. One 208 Volt, 0.75 HP, 3-phase induction motor . A 3-phase, 440 V, 50 Hz, 4-pole slip ring induction motor is fed from the rotor side through an auto-transformer and the stator is connected to a variable resistance as shown in the figure. 100% found this document useful, Mark this document as useful, 0% found this document not useful, Mark this document as not useful, Save Numerical Problems Induction Motors.pdf For Later, A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500, rpm. â¢ AC induction motors are also the most common motors used in main powered home appliances. What is Squirrel Cage Induction Motor. It has an induced emf, of 60 volts on open circuit between the slip rings at stand still when the rated voltage is, supplied to the stator. Calculate (i) ratio of maximum to full load torque. â¦ One single-phase wattmeter plus miscellaneous apparatus as needed . 1. Name Type Range Qty 1. Soln: Current through rotor at stand still = current at starting, As external resistance is connected in series with rotor per ph, A three phase 3 kV, 24 pole, 50Hz, star connected slip ring induction motor has a rotor, resistance of 0.015 Ω and a stand still reactance of 0.265 Ω per phase. Thus, at normal supply voltage, like in transformers, the initial current taken by the primary is very large for a short while. Wattmeter (U.P.F.) An induction motor (also known as an asynchronous motor) is a commonly used AC electric motor. A three phase induction motor is a type of AC induction motors which operates on three phase supply as compared to the single phase induction motor where single phase supply is needed to operate it. The table below gives the commonly encountered problems in 3 phase squirrel cage induction motors, cause of problems and what remedy to apply to bring the motor back to production. Carbon steel. The rotor will constantly be turning to align its magnetic field with that of the stator field. Neglect stator impedance. Find the percentage slip and number of poles of the induction motor. (Ans: (i) 0.282, 30700 Syn. Scribd is the world's largest social reading and publishing site. Three Phase Induction Motor 8.1 Introduction The popularity of 3 phase induction motors on board ships is because of their simple, robust construction, and high reliability factor in the sea environment. Soln: Synchronous speed Ns = 120f/p = 120 x 50/24 = 250 rpm, Speed at maximum torque N = (1-S) Ns = 235.85 rpm, A 15 HP, 4 pole, 220 volts three phase star connected, 1725 rpm induction motor has the, and windage loss = 240 watts. Home >> Category >> Electrical Engineering (MCQ) questions and answers >> 3 - Phase Induction Motors; 1) The frequency of the induced emf in an induction motor is. o²ïàºîOÎ.lÖåð²-.+ÛzàùiàiþÁòÝë¨ìHDñL¬Ýz$6>qå0#áÏÙ;7N4cû} j¦ÁÊ×íÞ=©ÛG_Ú¿èGTdÑ¥ÿv:®St i¿ø[ i° ´gu~ûàw>qÑtÀ$ 4=½Ào$nn§çËÅèv]åyïÍ]v½¸ý;ðÐ¢jÍ>{qþ9ÏàéÕðÛ3Ëð£©öê;²Èï}8eÊØíoÇVÅÌû§Ðø¨H{ë aa´K_ÑkW+©(ìtç³m}i[ÿÉ''àùÉ?N >F¶ w â¢ The basic idea of an electric motor is to generate two magnetic fields: rotor magnetic field and stator magnetic field and make the stator field rotating. Speed at maximum torque. They run at a constant speed from no-load to the full load. Determine (i) Slip at maximum torque and maximum, torque in synchronous torque (ii) slip at maximum power and maximum power (iii), starting torque and starting current. The resistance and stand still reactance of rotor per phase are 0.5 Ω, and 5 Ω respectively. In small groups, investigate the DOL starter shown. As the starting current of an induction motor can be 6-8 times the running current the DOL starter is typically only used for motors with a rating of less than 5kW. Greater than the supply frequency b. This troubleshooting guide can also be applied to other types of three phase induction motors: A Three-phase Induction Motor Problem This application note describes how to set up, solve, and analyze the results of a two-pole, three-phase induction motor using RMxprt. 1) Check The Connection Of Motor. 10. 3 Phase Induction Motors Objective Questions With Answers - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. 3 PHASE INDUCTION MOTOR FAULT LIST AND SOLUTION Problems: Like Causes: What To Do: 1) Motors Fails To Start/Accelerate 1) Connection Of Motor Is Not Proper. The other is the mechanical problems, such as the problems of the bearing, fan blade, motor frame, coupling, end bell, bearing cover, spindle and so on. Induction Motor Equations ENGN1931F â Spring 2017 2 Let Ï Ï Ï L R S and be the angular velocities of the magnetic field (line frequency), rotor, and slip respectively. ThreeIV. One dynamometer with torque controller . For convenience we assume that Ï= 0 at t = 0, which implies Ï Ï= R t and Ï Ï Ï S L R= â. If someone works with AC 3-phase motors, then it is important to know how to connect these motors in Star and Delta connection, and how to detect an electrical problem. Determine the rotor current per phase (i) when the rotor is at, still and connected to a star connected rheostat of. 2) Supply Voltage Is Low (Less Than 415 Volt In Any Of 3 Phases). Full load torque is, obtained at a speed of 245 rpm. 1. Induction Motor Quiz Questions ) Search for: Related Pages. INSTRUMENTS REQUIRED ON CONTROL PANEL : S. No. The three phase supply current produces an electromagnetic field in the stator winding which leads to generate the torque in the rotor winding of three phase induction motor having magnetic field. The flux in the single-turn coil on the rotor surface is -phase Induction Machines Dr. Suad Ibrahim Shahl 14 Example 1: A 480V, 60 Hz, 6-pole, three-phase, delta-connected induction motor has the following parameters: It supplies an induction motor which has a full load speed of 1440 rpm. Discover everything Scribd has to offer, including books and audiobooks from major publishers. A typical 3-phase squirrel-cage motor has six connection leads in the electrical connection box for the three coils. The shaft of an induction motor is made of. The friction and windage losses are 920 W, the stator core loss is 4300 W and the stator copper loss is 2690 W. The rotor current and rotor resistance referred to stator are respectively 110 A and 0.15 Ω.If the slip is 3.8%, what is the percent efficiency? The stator of an induction motor consists of 3-phase windings, which when connected to a 3-phase supply creates a rotating magnetic field. One Phase Sequence Indicator . Hi fellows! Three Phase Induction Motors: Types, Construction and principle of operation, 3 phase Induction Motor, general phasor diagram, equivalent circuit, power and torque relations, condition for maximum torque, circle diagram, Performance characteristics, effect of rotor resistance on speed torque characteristics, stable & unstable region of 3. Problem #2 A 3-phase, 15 hp, 460 V, 4-pole, 60 Hz, 1728 rpm induction motor delivers full output power to a load connected to its shaft. Induction Motor Problems - Solutions Q #1 A 2-pole, 3-phase induction motor, fed by a 60 Hz source, Cast iron. The DOL starter switches the supply directly on to the contacts of the motor. Today, I am going to write about 3 Phase Induction Motor.As I mentioned earlier in my article on Introduction to Induction Motors, there are two types of Induction Motors, Single Phase Induction Motor and 3 phase Induction Motor.. 3 phase induction motor is the one which operates on three phase AC supply. 2. PRACTICE PROBLEMS ON INDUCTION MACHINE 1. Hoping everyone is fine and doing great. A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism.It is called a âsquirrel cageâ motor because the rotor inside of â¦ Voltmeter MI (Panel type) 0-500 V 1 3. Find the percentage slip and number of poles of the induction motor. percentage slip and number of poles of the induction motor. This will link and cut the rotor conductors which in turn will induce a current in the rotor conductors and 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 View Homework Help - Induction Motor Solutions.pdf from EE 4701 at University of Minnesota, Morris. Starting Method for Induction Motors A 3-phase induction motor is theoretically self starting. (ii) when running at 4 % slip with rheostat short circuited. Number of poles of induction motor = p = 120 f / n = 120 x 50/1440 = 4.16, The number of poles are to be even, selecting the nearest even number as the, Synchronous speed of the induction motor Ns = 120f/p = 120 x 50 /4 = 1500 rpm, If the induced emf in the stator of an 8 pole induction motor has a frequency of 50 Hz and, Hence N = (1- s)Ns = (1- 0.03) x 750 = 727.5 rpm, A three phase, 50 Hz, 4 pole slip ring induction motor has a star connected rotor. It supplies an induction motor which has a full load speed of 1440 rpm. The motor is coupled to a 220 V, separately excited dc generator feeding power to fixed resistance of 10 Î©. Maximum Torque Control (MTC) is a new method applied for control of induction motor drives. An induction motor is similar to a poly-phase transformer whose secondary is short circuited. Introduction: The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Once the induction motor has any problem, there might be some abnormal phenomena, for instance, the rising temperature, over current, vibration and abnormal noise and so on. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Stainless steel. 2) Maintain Proper Supply Voltage By Using Autotransformer Or Transformer Tap Changer. Control the induction motor line current by adjusting the dynamometer field. 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