Slip line lecture 56 circle diagram from test data lecture 57 starting of 3 phase induction motor introduction lecture 58 dol and reactor starting lecture 59 dol and auto transformer starting lecture 60. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. 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. Schematic diagram illustration instructions there are two parts lists to choose from depending upon the availability of 120vac or. Circle diagram of induction motor simple steps to learn circle. The input power given to an induction motor is in the form of threephase voltage and currents. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. In many cases, the singlephase motors on board a ship will be wired into the lighting distribution. The circle diagram is a graphic representation of the performance of the machine and its drawn in terms of the locus of the input voltage and current.
Nptel, online courses and certification, learn for free. More precisely, you will be familiar with the characteristics of directonline starters and soft starters. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. To understand the circle diagram of induction motor we should first know what is the circle diagram. In a 3ph induction motor if we shift the magnetising branch.
The stator part of the equivalent circuit together with the magnetising branch can be replaced by a. There are two basic reasons for the use of singlephase motors rather than 3phase motors. Draw circle diagram for any motor in hindi duration. Hence, we find that if an induction motor is tested at various loads, the. Circle diagram of induction motor simple steps to learn. 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. Induction motor circle diagrams gp technologies ltd. The basic diagram view a shows a circle with two leads labeled t1 and t2.
Singlephase induction motor the winding used normally in the stator fig. The concept of the circle diagram was conceived in the late 19th century, but is today no longer commonly utilized by engineers. Ac induction motors are also the most common motors used in main powered home appliances. It is very useful to study the performance of an electric machine under a large variety of operating conditions. An induction motor always operates at a speed lower than the synchronous speed because the rotating magnetic field that occurs in the stator will generate flux in the rotor that will cause the rotor to rotate, but due to the delay of the flow current in the rotor with current flow in the stator, the rotor will never reach its rotating magnetic field speed, that is, the synchronous speed. The motor circle diagram also known as a heyland, behrend, or ossanna diagram is simply a graphical representation of the locus of induction motor stator current from zero speed to synchronous speed. It is the diagrammatic representation of the performance of the induction motor. To analyse the three phase induction motor performance using circle diagram we need to. Circle diagram of an induction motor the circle diagram of an induction motor is very useful to study its performance under all operating conditions. Download link is provided and students can download the anna university ee6504 electrical machinesii em ii syllabus question bank lecture notes syllabus part a 2 marks with answers part b 16 marks question bank with answer, all the materials are listed below for the students to make use of it and score good maximum marks with our study materials. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Coefficient of coupling, energy stored in coupled coils lecture 05. Generally three phase induction motor is treated as rotating transformer. Threephase induction motor starters labvolt threephase induction motor starters.
And its based on the approximate equivalent circuit before deepen in steps of drawing the diagram it. The circle diagram means that it is figure or curve which is drawn has a circular shape. Fixing operating point when load torque is present. The threephase induction motor is the extensively used for various kinds of industrial drives. The circle diagram of an induction motor is very useful to study its performance under all operating conditions. Nptel provides elearning through online web and video courses various streams. Development of equivalent circuit of the motor when it runs with a slip. Circle diagram induction motor pdf conduct no load test and blocked rotor test on the induction motor and find out the per phase values of no load current i0, short.
The data below give the measurements of line current, voltage and reading of two wattmeters connected to measure the input. Power flow diagram and losses of induction motor circuit. Introduction to induction motor instrumentation and. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Actually, we do not have that much time or patience to go through the writings so we prefer diagrammatic. To illustrate the simplicity of the ac induction motor. Learning objectives computations and circle diagrams. Lecture 53 exact power flow diagram and circle diagram lecture 54 circle diagram continued. If we look at the voltage induced in these coils as phasors, the diagram looks as shown in g. Record all nameplate information for the induction motor. The circle diagram can be drawn for alternators, synchronous motors, transformers, induction motors. Lecture 6 three phase induction motors cairo university. As we know, the diagrammatic representation is easier compared to theoretical and mathematical descriptions. What is a circle diagram a circle diagram is a graphical representation of the performance of an electrical machine.
You will understand the important phenomena that occur when you start a motor using either a directon. Starting of 3 phase induction motors, high starting. Explain how the performance of induction motor can be predicted by circle diagram. Single phase induction motors have very high starting torque b.
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. Ppt induction motor powerpoint presentation free to. For most shore facility applications, this is the case. Singlephase induction motor, starting torque, main and auxiliary windings, starting methods, splitphase, capacitor type, motor with capacitor startrun. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Positive current is said to ow in these coils when current ows out of the page in a. Fall 2005 ee595s electric drive systems 3 voltsperhertz control history. To build an ac permanent capacitor splitphase induction motor. The circle diagram is a graphical solution of the motor equivalent circuit which traces the locus of stator current. A three phase induction motor is running at a synchronous speed of 1500 rpm,the rotor runs. The power flow diagram of an induction motor is shown below. Types and constructional features of 3phase induction motor. It is commonly used to illustrate the performance of transformers, alternators, synchronous motors, and induction motors. Synchronous machines 6 where w is the angular frequency of emf in electrical radians per second and wm the angular speed of the rotor in mechanical radians per second.
Slip is the ratio between the slip speed and synchronous speed. Pdf computeraided teaching using matlabsimulink for. The rotor of an induction motor can be a squirrel cage rotor or wound. Induction machines guru nanak dev engineering college. Power flow diagram of induction motor explains the input given to the motor, the losses occurring and the output of the motor. Draw the circle diagram for a 3phase, meshconnected, 22. Learn for free, pay a small fee for exam and get a certificate. The current of a series circuit of constant reactance and variable resistance lies in a circle of diameter, vx, where v is the voltage across the series circuit and x is the reactance. Circle diagram of an induction motor its construction. You should also make a dc measurement of stator winding linetoline resistance using a dmm. The magnetization current im flowing in the motors equivalent circuit fig. The rotor will constantly be turning to align its magnetic field with that of the stator field.
Just as in the threephase motor diagram, the motor shows the power supply lines as being identified with the t. The 3phase set of currents, each of equal magnitude and with a phase. The power flow is given by the equation shown below. Its diameter is still vx01 and is parallel to the horizontal axis oc. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. No name of experiment page no 1 to perform the brake test on a 3 slip ring induction motor and obtain its performance characteristics 2 to start a 3phase slip ring induction motor by rotor resistance starter.
Pdf ee6504 electrical machinesii emii books, lecture. A circle diagram is a graphical representation of the performance of an electrical machine. The basic idea of an electric motor is to generate two magnetic fields. The end of current vector for i1 is also seen to lie on another circle which is displaced from the dotted circle by an amount i0. Computations and circle diagrams 15 b0 of the exciting circuit are assumed constant, then i0 and. This paper describes an automatic procedure using matlab software to plot the circle diagram for two induction motors ims, with wound and squirrelcage rotors, from noload and blockedrotor tests. The induction motor is made up of the stator, or stationary windings, and the rotor. The construction of the circle diagram is based on the approximate equivalent circuit shown below.
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