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Register a new userAnalytical and laboratory study of the effect of unbalanced voltages in the voltage source on the currents and performance of a three-phase induction motor
دراسة تحليلية و مخبرية لتأثير عدم توازن جهود التغذية على تيارات و أداء محرِّك تحريضي ثلاثي الطور
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يقدم هذا البحث دراسة تحليلية و مخبرية لسلوك و تطور المركبات المتناظرة لكل من الجهد و التيار لمحرك تحريضي ثلاثي الطور و ذلك كتابع لعزم الحمولة المطبق عليه و لتفاقم عدم التوازن الذي يصيب الشبكة الكهربائية المغذية. كما سيتم دراسة تأثير عدم توازن جهود التغذية هذا على توزيع تيارات المحرك في الخطوط الثلاثة و على أدائه.
This paper presents an analytical and laboratory study of the behavior and evolution of the symmetrical components of both voltage and current of a three-phase induction motor as a function of the load torque applied to it and to increasing in the imbalance which effect the electrical grid. The effect of unbalanced voltages in the voltage source will be also examined on the distribution of motor currents in the three lines and on its performance.
References used
A.V. Jouanne, B. Banerjee, “Assessment of voltage unbalance,” IEEE Trans. Power Delivery, Vol. 16, No. 4,October 2001, pp. 782- 790
O. Souto, J. Oliveira, and L. Neto, “Induction motors thermal behavior and life expectancy under nonideal supply conditions,” in IX Int. Conf.Harmonics and Quality of Power, Orlando, FL, 2000
Condition monitoring of stator faults in induction motors: Part II- A more sensitive indicator of inter-turn shortcircuits fault in stator windings under unbalanced supply voltage.”, proposed for the same conference
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The purpose of research is to build a model of the electric driving system for threephase
squirrel-cage induction motor using oriented electric field method so as to control
both the speed , flux and current, ( PI ) controllers was used .
The mach
ine model has been formed based on the equations of the machine written
in the stationary coordinates .
To complete the process of control without measuring the rotor flux , a model of flux
from the measured values of stator current and rotor speed was build, and it can be
measured directly .
This paper presents an accurate mathematical model of threephase
induction motor for both transient and steady-state studies. this
model takes into account the network harmonics, Skin Effect and
Stator and Rotor Magnetic Saturation. and to be able
to present the
real motor and its internal physical phenomena better than the
existing classical models.
In this paper, the development of the drive system of the motor Wire port Crane
according to the principle of the indirect field orientation.
Require the operation of the port Crane operations, different operation situations of
variable speed and
Torque with time, which is a case dynamic electro and electro-magnetic
transient, may affect the performance of operations, so therefore been building motor Wire
port Crane operations system corps in winches achieve:
- High performance and Efficiency.
- Build the desired control system according to the principle of the Pulse Width
Modulation (PWM) and the main power system, taking into account the reduction of
changes DC-Link voltage and achieve maximum flux before starting the motor.
- Reduction of excess Voltage that may appear on a DC-Link, using the brake
Transistor with Brake resisters.
At the end of the research has been reviewed and the search results that indicate the
outstanding performance of the proposed system with the ability to use the same system to
run automated processes different.
The presented paper deals with an implemented speed sensorless direct vector control (DVC) technique based on stator flux orientation algorithm to estimate and control rotor speed of three phase induction motor (IM). The driver system is presented in
this paper has a three phase bridge uncontrolled rectifier and space vector pulse width modulated (SV-PWM) inverter to drive and control the speed of the (IM) at different mechanical load conditions. The rotor speed has been obtained by slip frequency estimation instead of use feedback speed sensor. The structure of Volt/Freq via PI-controller is used to control and adjust speed accuracy between required and estimation rotor speed to precise speed response. The proportional and time integration controller values obtain by Ziegler-Nichols closed-loop tuning method. Computer simulation results with Matlab/Simulink program show an acceptable speed control response, minimum error at steady state and dynamic condition, a results show also the stator voltage, current and flux estimated in direct-quadrate of stationary and synchronous reference frame at variation in load up to (10 N.m) beside the synchronous, slip and rotor speed estimation are varied between (250-1486 rpm).
Keywords: Induction Motor Drive System, Direct Vector Control, Speed Sensorless.
The study of electromagnetism in electrical machines is critical, especially in the field of
design, investment and optimal performance. To achieve this, there are many ways in which
varying degrees of accuracy . The main aim of this piece of resea
rch is to study electromagnetic
fields distribution in 3ph-induction machines using computational numerical methods and proper
software, because these fields form the basic principle in machine 's work. It has been used the
finite element method aided computer to solve magnetic equations (Maxwell equations).
The simulation of magnetic field in induction machine performed by ANSYS-software. The
paper shows technique for finding the electromagnetic fields distribution in all parts inside 3phinduction
machine to get optimal design.
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