Design of Prototype Dynamic Ac Power Machine with Equivalent Circuit Modeling (Torque Speed Curve of Induction Motor 1,1, Kw)

Squirrel cage induction motors are widely used in electric motor drives due to their satisfactory mechanical characteristics (torque, current, overloading) and small dimensions, as well as their low price. When starting an induction motor, a large current is required for magnetizing its core, which results in a low power factor, rotor power losses and a temperature rise in the windings. None of these parameters should reach values beyond certain limits until the motor reaches nominal speed. The speed of an induction motor 1,1kW is affected very little by fluctuations of voltage. The greater the supply voltage of the motor, the induction motor's speed will increase. The torque values (Tstart, TSmax and Tmax) are affected by the value of the motor supply voltage: (Vp-nl : 132.8, Tstart1 : 7.4, T S-max1 : 0.4, Tmax1 : 9.9) V, (Vp-nl : 127.0, Tstart2 : 4.8, T S-max1 : 0.3, Tmax1 : 8.4) V and (Vp-nl : 121.3, Tstart3 : 3.3, T S-max3 : 0.2, Tmax3 : 7.1) V. Stator current (IL-nl ; 2.5, 2.2, 1.9 ) Amp rises gradually on account of the increase in magnetising current (Im : 2.5, 2.2, 1.9) Amp. The magnetising current required to produce the stator flux. The component of the stator current which provides the ampere-turns balancing the rotor ampere-turns will steadily diminish as the rotor current (IL-nl) decrease with the increase in rotor speed (nr).&nbsp

Motoring and Generating mode of 3-Φ Induction Machine – A Comparative Evaluation For Energy Efficiency

Vast use of fossil fuels is leading to energy deficiency. Hence the renewable energy sources like wind energy and solar energy are being used. Classical asynchronous induction generators are being used in wind energy based power generation system. In markets of micro electric energy generation unit system, induction generators are getting popularized, as it is cheap, robust and maintenance free. But generally induction machines are used as motor, hence the catalogues have only information about motoring mode. This report gives a comparative analysis between motoring and generating mode of induction machines. From this report we conclude that the induction motors have more efficiency and less losses than induction generators

Adjustable speed drives laboratory based on dSPACE controller

This thesis refers to the EE 4490 Adjustable Speed Drives course, which is taught at Louisiana State University (LSU). The part of this course is variable speed AC and DC drives laboratory. The objective of this thesis is to modify the existing DSP Based Electric Drives Lab Manual developed by Department of Electrical and Computer Engineering, University of Minnesota in order to adjust it to the EE 4490 course syllabus and to verify the experiments by carrying out the tests on the lab equipment available at the Elec. & Comp. Eng. Dept at LSU. There are four major components, of the available lab equipment, which are used to perform all the lab experiments: Motor Coupling System, Power Electronics Drive board, DSP based DS1104 R&D controller and CP 1104 I/O board. The DS1104 R&D controller is programmed applying the Matlab/Simulink software and with the use of CP 1104 I/O board and Power Electronics Drive board the motor-load set is controlled. The thesis consists of two parts: - EE 4490 Adjustable Speed Drives Laboratory based on dSPACE controller Lab Manual, - Lab Report. The first part gives students the detailed introduction to lab experiments. The second part contains the results obtained from the experiments. The lab manual consists of eight experiments: - The first two experiments: Expt. 1 and Expt. 2 introduce students to modeling the dynamics of the system in Simulink (Expt. 1) and next, to model it in real-time and to perform the experiment using the dSPACE controller together with the Control desk (Expt. 2). - The Experiments 3 – 6 allow to learn students how to design the current and speed controllers for DC PM motor drive, to test them by modeling the whole DC drive system in Simulink and next, to control the system in real-time. - The last two experiments (Expts. 7 and 8) concern the characterization and V/f speed control of induction motor. By performing all lab experiments students can learn how to build simple dynamic model in Simulink/Matlab to more complex systems such as feed-back control of DC motor drive and V/f speed control of induction motor

Identification of induction machine parameters using only no-load test measurements

Several methods have been used to estimate the parameters of induction machines. The basic method is the standard no-load and block rotor test. Although accurate results are obtained using this method; however, performing the locked rotor test is difficult, requiring full control of the voltage by using appropriate instrument to mechanically secure the rotor in the locked condition. Therefore, in this paper, a method requiring only a no-load test to extract the parameters of the induction machine is presented. The proposed method is based on the modification of the third impedance calculation of the IEEE standard 112. To validate the proposed method, parameters of a standard 7.5kW induction machine are estimated. Based on the experimental results, the maximum recorded error in the parameter estimation is less than -2.881% when compared to the reference parameters obtained from the conventional no-load and blocked rotor test.Keywords: induction motor, no-load tests, machine parameters, third impedance calculation, blocked-rotor tes

Efficiency improvement of three phase squirrel cage induction motor by controlling the applied voltage to the stator using SIMULINK models

2018 Spring.Includes bibliographical references.Optimizing the efficiency of three phase squirrel cage induction motors (SCIMs) plays a big role in saving electric energy consumption. The purpose of this thesis is to maximize the efficiency of three phase (SCIM) when it runs at speeds greater than the speed at which the efficiency is maximum during normal operation, i.e., rated voltage by decreasing the applied voltage to the stator using MATLAB/SIMULINK. Equivalent circuit and parameter identification of three phase (SCIM) are explained. MATLAB/SIMULINK is employed to identify the motor parameters and to simulate a three phase (SCIM) under different loads. The effect of reducing the voltage on motor characteristics such as the produced torque by the motor, power factor, reactive power, apparent power, output power, rotor speed and magnetizing current is explained

Experimental results of vector control for an asynchronous machine

The aim of this article is contributeto the advanced vector control strategy of asynchronous machines. Analyzes of experimental of indirect field-oriented control are presented. In this context, we propose vector control algorithms to provide solutions to the disadvantages of field-oriented control FOC.The results obtained from various methods of determining the parameters for asynchronous machine are compared. We calculate the various parameters and then we present the technical characteristics of each element of the asynchronous machine; finally, we implement the vector control used asbasis of comparison between the simulation under Matlab/Simulink software and experiments. The simulation and experimental tests show that the proposed controller is suitable for medium and high-performance applications

Parameter identification of induction motor

Numerous recent techniques of induction motor parameters calculating are hard to be done and expensive. Accurate calculations of the parameters of these motors would allow savings in different prospective like energy and cost. The major problem in calculating induction motor parameters is that it\u27s hard to measure output power precisely and without harm during the operation of the machines. It will be better to find other way to find out the output power with certain amount of inputs like input voltage and current.;Particle swarm optimization (PSO) and genetic algorithms (GAs) are often used to estimate quantities from limited information. They belong to a class of weak search procedures, that is, they do not provide the best solution, but one close to it. It is a randomized process in which follows the principles of evolution.;In this thesis genetic algorithm and partial swarm optimization are used to identify induction motor parameters. The inputs used to estimate electrical and mechanical parameters are measured stator voltages and currents. The estimated parameters compare well with the actual parameters. Data Acquisition (DAQ) is used to obtain these variable with the help of LABVIEW software. The induction motor used is a 7.5-hp with a constant frequency and in free acceleration. IEEE standard test of 7.5-hp induction motor is used to compare with performance of the simulated and measured data obtained. According to the output results, method of optimizing induction machine can be used in different models of induction motor

Analisis dan Pemodelan Motor Induksi Tiga Fasa Delapan Kutub dengan Rangkaian Ekivalen Invers Г

This study aimed to analyze and modelling an induction motor. The motor is used in this study is three phases induction motor eight poles, 500 W, 30 V, 50 Hz and 750 rpm. In this study the equivalent circuit is form into an inverse Г transformation equations of three phases induction motor. The porpose of this study is to create a model of three phases induction motor eight poles using inverse Г equivalent circuit, analyzing equations and equivalent circuit models obtained using matlab application, and comparing the results with the results of the actual testing analyst induction motor three phases eight poles.Analysts done on two conditions, no load and load. From direct testing and analysis results were found comparisons percent error of the test results and analysis of induction motor three phases eight poles, there are input voltage when starting is 11%, starting current 23,21%, the influence load to voltage is 2,9%, the effect of load on the starting current 24,3% and during the current reduce is 26%. The percent error is quite high, this is cause errors in measurement parameters

Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging

Recently, due to rising environmental concerns and predicted future shortages of fossil fuels, there is a movement towards electrification of the transportation industry. A vast majority of the current research uses permanent magnet synchronous machines as the main traction motor in the drivetrain. This work proposes to add a special damper to a conventional permanent magnet synchronous machine to further improve the suitability of this machine for electrified vehicles. Firstly, an equivalent circuit model is developed to simulate the operation of a conventional PMSM with a damper. A synchronous loading test is proposed to determine the synchronous reactance of the machine. A modified blocked rotor test is used to find the damper parameters assuming that the rotor cage construction is known. Also a single-phase AC test that can be used to determine the damper parameters without prior knowledge of the rotor construction is proposed and presented as an alternative to the blocked rotor test. Thereafter, the models of a 50 kW traction motor and the same machine with damper bars are developed and simulated. The performance of both machines are compared and evaluated. The damper parameters are selected based on the dynamic and steady state performances. It is also shown that the machine with a damper has faster response to a three-phase short circuit fault. In addition, this study also looks into integrated charging which utilizes the existing drivetrain components for vehicle to grid and grid to vehicle operation. The damper is shown to be effective in mitigating the saliency condition caused by the buried magnets of IPMSM at stand-still condition. As a result, the machine windings can be used as line inductors for integrated charging

An Integral Battery Charger with Power Factor Correction for Electric Scooter

This paper presents an integral battery charger for an electric scooter with high voltage batteries and interior-permanent-magnet motor traction drive. The battery charger is derived from the power hardware of the scooter, with the ac motor drive that operates as three-phase boost rectifier with power factor correction capability. The control of the charger is also integrated into the scooter control firmware that is implemented on a fixed-point DSP controller. Current-controlled or voltage-controlled charge modes are actuated according to the requirements of the battery management system, that is embedded into the battery pack. With respect to previous integrated chargers, the ac current is absorbed at unitary power factor with no harmonic distortion. Moreover, no additional filtering is needed since the pulsewidth modulation ripple is minimized by means of phase interleaving. The feasibility of the integral charger with different ac motors (induction motor, surface-mounted phase modulation motor) is also discussed, by means of a general model purposely developed for three-phase ac machines. The effectiveness of the proposed battery charger is experimentally demonstrated on a prototype electric scooter, equipped with two Li-ion battery packs rated 260 V, 20 A