First, the analysis model of the SLIM considering the missing part of the secondary plate is proposed. Induction Motor Example. Figure 2. 12. This paper presents an accurate method to extract parameters of induction motor (IM) from finite element field solutions. Per Phase Equivalent Circuit. In Induction motor we If the motor is spinning at synchronous speed in the CCW direction, The slip relative to the CCW field is zero The slip relative to the CW field is 2 So, you have two different slip's resulting in two different impedances for the circuit equivalent. amplitude/frequency harmonic, by applying those voltage. This equivalent circuit and the equations discussed in class assume a symmetric Y-connected winding. After the introduction of the EDISON electrical distribution system by Edison in the United States, a gradual transition began to the most economical AC system. These may be divided into two parts [3]. Now Fig: 3.11 shows the equivalent circuit per phase of a 3-phase induction motor. An equivalent circuit of the linear induction motor that makes it possible to greatly simplify the procedure for calculating the operational and start-up performances of linear and arc-stator motors is presented. II. The rotor current flow is: 0 0 0 R R R R R R R R R R E E E I R jX R jsX R jX s Therefore, the overall rotor impedance talking into account rotor slip would be:, 0 R R eq R R Z jX s And the rotor equivalent circuit using this convention is: This is very similar to that of transformer equivalent circuit when its secondary is shorted. squirrel-cage induction motor. frequency (frequency of the rotor circuit),slip rpm at full load. In the above circuit, the only component that depends on the slip is the resistance.
circuited and its equivalent circuit will be as shown in fig: 1.6 (a), Em being e.m.f. ThreeIV. The two flux components induce e.m.f. the motor slip; b.) 3-Phase Induction Motors EE 340 . Torque and Power Characteristics . Fig:1.6 (a) Equivalent Circuit of a Single Phase Induction Motor The motor may now be viewed from the point of view of the two revolving field theory. (a.) -phase Induction Machines Dr. Suad Ibrahim Shahl . Figure 1. to induction machines. Slip . It is independent of slip. For this purpose, three tests should be conducted: The equivalent circuit of the induction motor for harmonics of a higher order of harmonic (h = f h /f 1) is similar to the one of the induction motor in the short circuit regime with its rotor locked [6]. The motor drives a mechanical load at a speed of 1170 rpm. Generating, n. m > n. s. indicates that if the power converted is negative, so is the air gap power.
Download Free PDF Investigation of the effects of the equivalent circuit parameters on induction motor torque using three different equivalent circuit models MATEC Web of Conferences, 2018 squirrel-cage induction motor. High Quality Travel Cooking Appliances Induction Cookers The Best Portable Induction Cooktop Reviews By Wirecutter Travel Cooker Induction Cooktops Buy Travel Cooker Im all about making this search as easy as possible for you so below you will find my best First, the analysis model of the SLIM considering the missing part of the secondary plate is proposed. FIGURE 1 Induction motor torque-speed characteristic curves. power & torque inputs to the shaft: P jr=|I1|2R2=35.2 W P m=P r+P jr=1410 + 35.2=1445W T=3 9.55 P m/n=22.3 N m In this work, the model has been developed using the formulation outlined in [3]. A variable transformation is then applied, which makes it possible to derive a circuit for each annular region in the motor. The equation for Vqs and Vqr can be represented for a circuit equivalent of a transformed where and induced voltage in the secondary is function of the rotor flux and the rotor speed. 6. This gives the rotor portion of the circuit model two sections as shown below to the left: Since it is DC supply, f = 0, hence no induced current in the rotor circuit. INTRODUCTION The methods for determination of three-phase induction motors efficiency, given in standards IEEE 112 1996 [1] and IEC 60034- 4 [2], include five methods. The values used in the circuit are used to dictate the necessary gating signals for the pwm inverter. 4. Safety easy to clean. A methodology for obtaining the parameters of the equivalent circuit is presented, This paper proposes a new equivalent circuit for medium voltage and great power induction motors considering the more complete information given by the manufacturer. Based on this model, the shaft voltage and bearing current problems are analyzed deeply in motor drive system. Thus, the only quantity limiting current flow in the motor is the stator resistance, and it Power and Torque in an Induction Motor The input impedance of the motor is given by The only element in the equivalent circuit where the air-gap power can be consumed is in the resistor R 2 /s, therefore, 8 1 1 1 3 eq 1 1 m 2 2 in f 1 1 AG in SCL core 2 SCL 2 1 Z = R + jX +(jX ) R + jX I Z P VICos P = P -P -P P = 3I R eq V I Now, with the help of an auxiliary winding, the motor is started. final equivalent circuit (Figure 13) for the induction motor using these values, (b) Use your . This curve is called the torque-speed characteristic curve. Note: Plots: Plot at 100% rated voltage the three different R 2 cases for output torque on the same plot. Inchange semiconductor product specification silicon npn power transistors 2sc5296 description u with to 3pml package u high breakdown voltage high reliability. to calculate the expected starting current of the motor assuming 120 V. Single Phase Induction Motor Double revolving field theory Each of the rotating fields induces a voltage in the rotor, which drives current and produces torque. The stator magnetic field rotates at the motors synchronous speed (n s). The impedances (all given in ) are R 1: stator resistance X 1: stator leakage reactance; sometimes X 1 X 1. of Bangladesh. 4. maintenance requirements. X 2 =2f 2 L 2 But f 2 =sf 1 X 2 =2 sf 1 L 2 =s (2 f 1 L 2 ) Or X 2 =sX 20. 10.
7nm 5nm 3nm The New Materials And Transistors That Will Transistors Big E m is the resultant induced voltage in the main winding. II. equivalent circuit has been presented to estimate efciency as well as the rotor and stator losses in steady-state mode of operation of induction motors subjected to uctuated voltages. Before jumping into the equivalent circuit, a few concepts are useful. masum heera. For most commercially available or previously installed motors, however, neither the original test data nor the equivalent circuit parameters are available from the motor manufacturer. Rotational losses are 1300W. Equivalent circuit (d-axis) of induction motor Parks Transformation matrix in Simulink:- But the above matrix is in simple form, therefore cannot be implemented. And to separate the leakage reactances, the frozen permeability method is used in the static magnetic field simulation for the slot leakage flux calculation. The path of the bearing current is confirmed and the reduction methods are proposed. INTRODUCTION Three-phase induction motors (TIM) operating under steady-state regime are commonly modeled using a per phase equivalent circuit, which enables the calculation of quantities such as line current, power factor, input and output power and efficiency simply as a function of supply voltage, frequency The iron losses in the motor of motorized spindles have a significant effect on their heat generation, thermal deformation, and machining accuracy. Assume a NEMA D motor.
The reactance of the rotor is given by the formula. Approximate Equivalent Circuit of Induction Motor As in case of a transformer, the approximate equivalent circuit of an induction motor is obtained by shifting the shunt branch (R c \\jX m) to the input terminals as shown in Figure (Fig. Figure 2 showed the equivalent circuit for the stator. Induction Motors Equivalent Circuit - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online.
The locked -rotor test is made at 15 Hz to minimize the errors due to saturation and skin effects. The first type is the induction motor or asynchronous motor: Presentation on Green University of Bangladesh Equivalent Circuit of Three Phase Induction Motor. 7. We need to add the rotor to the equivalent circuit. INTRODUCTION The methods for determination of three-phase induction motors efficiency, given in standards IEEE 112 1996 [1] and IEC 60034- 4 [2], include five methods. one in which primary winding is stationary but the secondary is free to rotate. Draw the equivalent circuit diagram of three phase induction motor. motor per-phase equivalent circuit Fig. 5. INDUCTION MACHINE MODELING MAGNETIC EQUIVALENT CIRCUIT (MEC) APPROACH In this section, development of a magnetic equivalent circuit (MEC) model for fault simulation studies is discussed. The motor slip, compared to the harmonic rotating fields, is given by s h=1 (1-s)/h, where h is the motor slip in relation to the In this work, the model has been developed using the formulation outlined in [3]. Depending on the desired application, the circuit may or may not represent core losses, a double cage or even the variation of parameters due to skin effect and saturation. 3. V1 I1 E2 R2/S R1 X1 X2 I2 XX IX V1 I1 Rf R1 X1 Xf Current will flow through the stator circuit. conduction by induction in the same way as the secondary of 2-winding transformer receives its power from the primary winding. The electric energy generated purchased by consumers for different needs. These may be divided into two parts [3]. The impedances of the circuits shown in Figure 5 are found from no-load and blocked-rotor tests. 3 phase induction motor runs at 891 rpm under full load. The symbols used in induction machine models vary depending on the text and the context in which the circuit is being used. (8) and (9), the ratio of the EMFs at the stator and rotor sides is 1 : s. The positive sequence equivalent circuit for the induction motor can be given by Fig.5. A cost effective off-line method for equivalent circuit parameter estimation of an induction motor using hybrid of genetic algorithm and particle swarm optimization (HGAPSO) is proposed. According to [17], the Engineering Method for parameter identification of the per unit equivalent circuit of the induction motor is given as follows: 1. (c.) The full-load slip is the slip at the rated speed. induced in the stator. Figure 5: Two forms of equivalent circuits of an induction motor. Vds Vdr Rs Rr ids Lls Llr idr Z\ dse \Z eqs Z r \ qr Lm \ dr Fig. The equivalent circuits of induction motors are shown in Figures 2, 3 and 4 which are similar to the
This new set of curves is equivalent to adding resistance to the rotor of the machine. induction motor 12. amplitude/frequency values to the equivalent circuit for two cases: a) The starting slip case (s=1.0), and, b) The running slip case (s=rated). mutual inductances of induction motor. Through induction, electromagnetic forces (EMFs) are gen-erated at the stator winding and the rotor winding: E+ s= j!e^ j! The induction motor equivalent circuit is shown below. Determination of Motor Constants . The Transformer Model or an Induction Motor The primary impedances and the magnetization current of the induction motor are very similar to the corresponding component in a transformer equivalent circuit (primary). The reactance of the induction motor rotor depends upon the inductance of the rotor, voltage frequency, and rotor's current. 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. Hence, an equivalent circuit similar to that APECCAST Motor Repairs Existing and Best Practices in Motor Repair Task 1.pdf.
of EEE. This step has 1: Induction motor per-phase equivalent circuit. AbstractThe equivalent T circuit of an induction motor is found in every engineering motors book and is becoming increasingly important with the popularity of vector control.
Power Relation of Equivalent Circuit. Induction Motor Concepts. 2.
Fig. The parameter estimation methodology describes a method Induction machine equivalent circuit is very similar to the single-phase equivalent circuit of transformer. If we still assume the power flow directions as induction motors (from the stator to rotor) in slide #23, P r, P m and P e are all negative. 1.1.1 Definitions and Notation Definitions and notation of motor parameters: stator resistance R First, a general form of the field solution is obtained using transfer matrices. Key words: equivalent T circuit, -circuit, induction motors, parameters estimation, efficiency 1. Change the equivalent circuit by Increasing the resistor R 2 in the rotor by 2 , then 4 of the equivalent circuit and recalculate the curves as above. This means the secondary is shorted. 4. Figure 4.3 gives the schematic diagram of a single-phase induction motor with one stator winding and a squirrel-cage rotor. In the above circuit. Lecture 6 Th ree phase induction motors: Operation, equivalent circuit, circle diagram, performance and characteristics, balance steady state operation, methods of starting and braking. This energy is Per-phase equivalent circuit Motor Slip R 1 and R 2: stator and rotor winding resistances X 1 and X 2: stator and rotor winding leakage reactances X m: magnetizing reactance induction motor with a rated current of 57.8 A. An equivalent circuit of the single-sided linear induction motor (SLIM) is presented to consider the discontinuity of the secondary plate, and the electromagnetic characteristics of the motor with the discontinuous secondary are obtained. We can derive an equation from the equivalent circuit that allows the calculation of the torque for a given value of slip. The input impedance seen by the source V1 at start is The stator input current I1 (starting current) is (b.) Rogers Equivalent Circuit Figure 3. Speed control.
Yes, Induction generator is nothing but just an induction motor running at speed more than synchronous speed. For an induction motor to work as an induction generator, it should be driven by a prime mover. The stator winding is connected to a thre One way to analyse and understand the operation of an induction motor is by the use of an equivalent circuit. XU et al. (i). The resulting rotor equivalent circuit is as shown: The rotor circuit model of an induction motor. Three-Phase Induction Motor Revised: April 11, 2013 9 of 10 REPORT 1. The input impedance seen by the source V1 at start is The stator input current I1 (starting current) is (b.) 1.1. Testing and applications. Willis Equivalent Circuit. R s and R r are the stator and rotor phase resistances referred to stator side, respectively. Circuit diagram of a forward reverse starter for a three phase induction motor. The operating principle of the induction motor can be briefly explained as, when balanced three phase voltages displaced in time from each other by angular intervals of 120 is applied to a stator having three phase windings displaced in space 3.3.1 , s < 0 In this lab, we will be working with a squirrel-cage induction motor, in which the rotor-side winding comprises a cast aluminum cage. Figure 1. Alternatively, we may assume P r, P m and P e to be from the rotor to stator as generators: Mech. It is the de facto standard bridge Determination of Equivalent Circuit Parameters of Single Phase Induction motor. The induction motor equivalent circuit parameters are usually computed from DC, no load, and blocked rotor test data as per IEEE Standard 112. the motor line current; c.) the apparent power the motor draws from the system; d.) active power drawn by the motor; e.) motor power factor; f.) total electric power losses of motor; g.) shaft power and torque; h.) efficiency Use per phase circuit model and circuit analysis to find these quantities Load test on single phase induction motor to draw output versus torque, current, power and efficiency characteristics. Tze-Fun Chan and Keli Shi. Induction Motor per-phase equivalent circuit. st (8) E+ r = js! This equivalent circuit shows the resemblances between an induction motor and a transformer. is s R s L R R R d L s /dt d R Vs s /dt s j o s RP/2 is R is +-Figure A.1 G equivalent circuit model of an induction motor. of EEE COURSE TEACHER Professor & Advisor Dept. An induction motor's rotor can be either wound type or squirrel-cage FIGURE 2 Induction motor stator equivalent circuit. st (9) From Eqs. Determine the motor parameters and the total core, friction and windage losses. Induction motor can be treated as a rotating transformer i.e. INDUCTION MACHINE MODELING MAGNETIC EQUIVALENT CIRCUIT (MEC) APPROACH In this section, development of a magnetic equivalent circuit (MEC) model for fault simulation studies is discussed. Looking at figure 3, as the stator flux sweeps by the rotor conductor, a voltage and current will be induced. Therefore, the equivalent circuit is always illustrated as one phase only (Selek et al., 2017). Answer (1 of 5): Equivalent circuit of any machine is mathematical representation. following simplified equivalent circuit: 5 ZRF = Rf + j Xf = (R2 / S + jX2) in parallel with jXx EQUIVALENT CIRCUIT ANALYSIS The characteristics of an induction motor, the speed, current, starting torque, maximum torque, the motor losses and efficiency can all be determined from an analysis of the equivalent circuit. Induction Motor Equivalent Circuit . For calculations involving starting values, the rotor is assumed to be stationary so that s = 1.
Equivalent circuit for the three-phase induction motor. The rotor windings constitute a secondary winding that is shorted. Emf and Emb in the respective stator winding. The equivalent circuit always bases on the Y connection regardless of the actual connection of the motor.
A 480V, 60 Hz, 6-pole, three-phase, delta-connected induction motor has the following parameters: R 1 = 0.461 ., R 2 = 0.258 ., X 1 = 0.510 ., X 2 = 0.756 ., X m = 30.74 . However, the determination Conventional equivalent circuit Note: Never use three-phase equivalent circuit. Equivalent circuit for the three-phase induction motor. 1.1.1 Definitions and Notation Definitions and notation of motor parameters: stator resistance R 22 . If we put the value of f r from equation (1) in the equation (3) then we get. Equivalent Circuit Of Three Phase Induction Motor Equivalent Circuit, Single Phase Induction Motor Circuit Model, Unit 3 Induction Motors Chettinad Co May 29th, 2022 Single Phase To Three Phase PWM Converter With Induction Motor The forward and the backward flux induces a voltage E mf and E mb respectively in the main stator winding. Note that mechanical load on the motor has been replaced by an equivalent electrical resistance RL given by; The circuit shown in Fig. In the equivalent circuit, it is assumed that the speed is constant. There is a striking similarity between this circuit and the one presented by Rogers, but there is considerable difference in the methods used to obtain values for the circuit elements. It needs unit vectors to convert (3) ) ( drrdrrdrrdsmrqsmqr piLiRiLiLpiLV +++= )4 ( 0 rdrdrrdrrqsm piLiRpiL ++=. Price ON CPT LAHORE AIR BASISHS CODEMAKE AND ORIGINDelivery Period (Minimum Or Ex Stock)Attach Complete Specification & Technical Information With Quotation : EQUIVALENT CIRCUIT DERIVATION AND PERFORMANCE OF SLIM BASED ON WINDING FUNCTION 1517 where is the secondary sheet conductivity, 0 is the air per- meability, v 2 is the primary operating speed, e is the angular speed of the primary power supply, is the primary pole pitch, J 1 is the equivalent primary current sheet density, and b y The impedances (all given in ) are R 1: stator resistance X 1: stator leakage reactance; sometimes X 1 X The rotor and stator inductance is larger in induction motor. It is possible to find the parameters of the equivalent circuit of the single phase induction motor experimentally as shown in Fig.4.4. se^ js! = =. Again, when slip s = 0, r2[ (1-s)/s)] = . The equivalent circuit is further simplified by shifting the shunt impedance branches R 0 and X 0 to the input terminals as shown in the circuit diagram below: The approximate circuit is based on the assumption that V 1 = E 1 = E 2. 7-Guntur. circuit of IM per phase referred to stator side). PDF | On Jun 6, 2021, Karrar S. Faraj published AC Machines || Equivalent Circuit of Induction Motor - Lecture(6) | Find, read and Core losses are usually modeled by a resistor R ic con-nected in parallel with the magnetizing reactance X m as shown in the proposed machine equivalent circuit of Figure 1. maintenance requirements. In induction motor, we use distributed windings. DC test This is a test for R 1 independent of R 2, X 1, and X 2. Injection of EMF in rotor circuit.pdf. MARKS: 75 (15) (20) (20) (20) created with PDF nitro Energy is transferred from one circuit to one or more circuits via electromagnetic induction Degree of protection IP 58 (on request IP68) It worked very well How to test a 3-phase motor is discussed in this article How to test a 3-phase motor is discussed in this article. 11. The HGAPSO inherits the advantages of both genetic algorithm (GA) and particle swarm optimization (PSO). 1.1 Electrical Equations and Equivalent Circuits Starting from the equivalent three-phase electrical circuit of the induction machine without neutral current, let us establish initially the relations between the various electrical variables. Follow. For calculations involving starting values, the rotor is assumed to be stationary so that s = 1. Induction motors are asynchronous. What is the speed of the rotor field relative to (i) rotor structure, (ii) The per-phase equivalent circuit is shown in figure 3 [2]. Silicon is actually preferred to germanium within the manufacture of semiconductor devices due to the following reasons. To draw the equivalent circuit we have to perform certain test in order to calculate various parameters. Key words: equivalent T circuit, -circuit, induction motors, parameters estimation, efficiency 1. The stator side has two parasitic components, R s and Ls, We will first consider the operation of the machine as a standard induction motor. The reactance (x) of a motors rotor relies on the inductance of the rotor and produced a current (I) and voltage (V) frequency. The induction motor equivalent circuit is shown below. (c.) The full-load slip is the slip at the rated speed. Always use per-phase equivalent circuit. Operation Beyond the Range 0 < s < 1 . Then, the slot The equivalent circuit of a single-phase single winding induction motor with the standstill rotor is shown below. By joining the equivalent circuits in cascade, a complete equivalent circuit for the motor is obtained. 2. Derive an equivalent circuit like Figure 5 for the tested machine.
In many cases, 4) Finally, take the square-root of the sum of respective. In this paper, a novel common-mode (CM) model with coupling parameters is established of induction motor. C5296 datasheet c5296 pdf. Draw the approximate equivalent circuit for the motor Lock-rotor No-load DC Test V line = 36.2 V 460.0 V V dc R 2 = a e f f 2 R R, is the rotor resistance referred to the stator. Simulation and experiment results are presented to indicate Introduction An electric motor is a device which converts an electrical energy into a mechanical energy. There are 308 induction cooker travel suppliers mainly located in asia. 1.1 Electrical Equations and Equivalent Circuits Starting from the equivalent three-phase electrical circuit of the induction machine without neutral current, let us establish initially the relations between the various electrical variables. The stator windings constitute primary windings that induce flux in the rotor and stator iron. The per-phase equivalent circuit for an induction motor is given in Figure 1. An equivalent circuit, similar to the equivalent circuit of a three phase motor, can represent each field The parameters of the two circuits are the same After years of experimentation and listening it is agreed that the best match uses a low gain in the first stage hfe80 approx and a high gain in the second stage hfe120 approx. This video is unavailable. 2. This induction is essentially a transformer operation, hence the equivalent circuit of an induction motor is similar to the equivalent circuit of a transformer. data, Three-phase induction motor. A 2-D non-linear time-harmonic application of IM is used in the simulation. 3) Determine the respective current input for each voltage. Plot the torque vs. speed and current vs. speed from the experiment data. If the rotor circuit is left open circuit and the rotor locked (standstill), when stator excitation is An induction motor relies for its operation on the induction of voltages and currents in its rotor circuit from the stator circuit (transformer action). The torque-speed characteristic of an induction motor can be significantly changed by Full descriptions of the circuits and the tests are found in Reference 1. In equation (4) X RO is the reactance of locked-rotor. An equivalent circuit of the single-sided linear induction motor (SLIM) is presented to consider the discontinuity of the secondary plate, and the electromagnetic characteristics of the motor with the discontinuous secondary are obtained. I. 3. Figure A.2 T equivalent circuit model of an induction motor. It helps to analyze the performance . Machine Questions. The equivalent circuit of the induction motor has been used to understand operations and analyze the induction motor for a long time [32]. Reactance is zero at DC. So, you have two different slip's resulting in two different impedances for the circuit equivalent. The starting sequence for the motor is as follows:Motor off (R open, S open, Y open)Start button pressed (S and Y contacts all close)Time delay (depending on the size of the motor)Y contacts openTime delay (depending on the size of the motor)R contacts close, S contacts open equivalent circuits. squirrel cage induction motor. Input power to stator- 3 V 1 I 1 Cos(). Conduct suitable tests to draw the equivalent circuit of single phase induction motor and determine performance parameters. 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 operation, Operation with unbalanced supply voltage. If L 2 = inductance of rotor, the rotor reactance is given by.
Introduce Presenter by Name: ID: Dept. 2. When the winding carries a sinusoidal current, it produces a sinusoidally space distributed mmf whose at a synchronous speed using D.C or a synchronous motor.
: approximate eqt. The per-phase equivalent circuit for an induction motor is given in Figure 1. The efficiency of the motor is a ratio of the real output power kWdivided by the real input power kW multiplied by 100%. 1. For a single phase induction motor the input power is equal to ( current multiplied by voltage multiplied by the power fact An equivalent circuit, similar to the equivalent circuit of a three phase motor, can represent each field The parameters of the two circuits are the same with the exception of the slip. Title: Simultaneously, Speed and Flux Control of a Induction Motor, with Brain Emotional Learning Based Intelligent Controller (BELBIC) Author In this lab, we will be working with a squirrel-cage induction motor, in which the rotor-side winding comprises a cast aluminum cage. (a.) At standstill condition, the value of slip s = 1, therefore r2[ (1-s)/s)] = 0. All of the ac motors, the polyphase induction motor is the Single phase induction motors. DC voltage is applied to the terminals of the stator windings of the induction motor. A 100 hp, 460V, 8 pole, 60 Hz, star connected. For smaller motors, we cannot use this. Determine the synchronous speed in rpm, slip, slip. An induction motor can therefore be made without electrical connections to the rotor. )2 ( qrmqssqssqs piLpilirV ++=. This model can be used if approximate analysis has to be done for large motors. Equivalent Circuit of Induction Motor The induction motor is similar to the transformer with the exception that its secondary windings are free to rotate As we noticed in the transformer, it is easier if we can combine these two circuits in one circuit but there are some difficulties in induction motor due to slip. Motor equivalent circuits Three-phase electric machines are always designed in a balanced system, as well as electric motors. Equivalent circuit model Theoretical analyses of the induction machine consider it to be a transformer with a rotating secondary. 1. The equivalent circuit of the induction machine is shown in Fig.2. Note: Plot the three V 1 = E1 + I 1(Rs +jXs) (1) V 1 = E 1 + I 1 ( R s + j X s) ( 1) Where E1 is the EMF induced in the stator coil by the mutual flux. The motor slip, compared to the harmonic rotating fields, is given by s h=1 (1-s)/h, where h is the motor slip in relation to the
equivalent circuit of induction motor pdf