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Register a new userSpeed Control of Three Phase Induction Motor Based on Speed Sensorless Direct Vector Control Technique
السيطرة على سرعة محرك حثي ثلاثي الأطوار بالاعتماد على تقنية سيطرة المتجه المباشر دون متحسس للسرعة
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يتضمن هذا البحث طريقة للتحكم بسرعة محرك حثي ثلاثي الطور باستخدام تقنية سيطرة المتجه المباشر بدون متحسس للسرعة بالاعتماد على نظرية تقييم فيض الجزء الساكن للمحرك. وتتكون منظومة سوق المحرك من معدل قنطري ثلاثي الطور غير محكوم وعاكس يعمل بنظام تضمين عرض النبضة بتقنية المتجه الفراغي للتشغيل والسيطرة على سرعة المحرك تحت عزوم ميكانيكية مختلفة. تم تقييم سرعة الدوار من خلال تقييم تردد الانزلاق للمحرك واستخدامه كتغذية خلفية بدل متحسس السرعة ألاسترجاعي (تاكوميتر) وفق التقنية أعلاه. تم استخدم تقنية الفولتية/تردد مع المتحكم التكاملي التناسبي للحصول على استجابة دقيقة من خلال المقارنة بين السرعة المطلوبة والسرعة المخمنة للوصول إلى دقة واستجابة جيدة بعد حساب قيم الكسب التناسبي وزمن التكامل للمتحكم. وكانت نتائج التمثيل الحاسوبي باستخدام برنامج (Matlab\Simulink) لاستجابة السيطرة على سرعة المحرك للحالة المستقرة والديناميكية لعزوم بحدود (5-10N.m) مرضية وبأقل خطأ ممكن وكذلك أوضحت النتائج فولتية وتيار وفيض الساكن المقيّمة للمحرك في أطار المرجع الثابت والمرجع التزامني الدوار للمحور المباشر والعمودي، والسرعة التزامنية وسرعة الدوار وسرعة الانزلاق المخمنة لسرع تتراوح (250-1486rpm).
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.
References used
S. Bodkhe1, and M. Aware, “Speed Sensorless, Adjustable Speed Induction Motor Drive Based on DC link Measurement”, International Journal of Physical Sciences, Vol.4, pp. 221-232, April, 2009.
Ahmed A. Al-Badrani, Rakan K. Antar, and Abdul kareem Z. Mansoor, ”Neural Network-PI Controller for Speed Control of a 3-phase Induction Motor Supplied from Rectifier-Inverter Set”, Eleventh Scientific Conference for Foundation of Technical Education 23-24, March, Baghdad, Iraq, pp. 377-383, 2009.
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Induction motors are the most widely used electrical motors due to their reliability,
low cost and robustness. However, induction motors do not inherently have the capability
of variable speed operation. Due to this reason, earlier dc motors were a
pplied in most of
the electrical drives. But the recent developments in speed control methods of the induction
motor have led to their large scale use in almost all electrical drives.
Out of the several methods of speed control of an induction such as pole changing,
frequency variation, variable rotor resistance, variable stator voltage, constant V/f control,
slip recovery method etc, the closed loop constant V/f speed control method is most widely
used. In this method, the V/f ratio is kept constant which in turn maintains the magnetizing
flux constant so that the maximum torque remains unchanged. Thus, the motor is
completely utilized in this method.
This paper presents a new contribution the domain of sensorless speed control of
doubly-fed induction generator in wind turbine applications. Where the speed and the
dynamic torque are estimated and used to feedback the control loops. The proposed
sensorless algorithm is robust to variations of the values of machine parameters where the
estimated speed is independent of them. The algorithm avoids using differentiation which
significantly improves its immunity to noise. The field oriented vector control theory is
used to control the speed of the doubly fed induction machine. The used controllers in
closed loops are classical proportional integral (PI). The modeling is based on the Park
equations of the induction machine and on a simple model of the three phase inverter. The
results of simulink on MATLAB provide good performance of the sensorless speed
control.
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 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 .
One of the skills that should be possessed by block players in volleyball is reaction
speed. It effectively influences the player’s ability to block strong shots from the opponent
correctly. However, response time is influenced by how much the play
er benefits from the
prime which is provided around him to prepare for the next movement. When a player
effectively prepares for the required movement in advance, these information are processed
more rapidly, and thus, we notice an improvement in the player’s reaction time.
Thus, we have conducted this study to find out the effect of special exercises
designed for motor preparation on reaction speed for block players center (3) in volleyball .
For the current study, we have used the priming test, suggested by Rosenbaum and
Kormblum (1982) as a prior test and a follow-up test for both test group and blocked
group, in order to figure out the effect of providing primes on the player’s reaction time.
The primes provided were either identity for the required movementor neutral. We have
followed the method of calculating the number of correct attempts executed by the players,
in order to infer the change in their reaction speed.
The results revealed improvement in the number of correct attempts for test group
after applying the suggested training program in the two situations (identity-neutral).
Therefore, we find that the applied program has contributed to an increase in the number of
correct executed attempts, which suggests an increase in the speed of processing the
information, leading to enhancing the reaction speed in block players center (3). In light of
these findings, we have recommended the necessity of using the suggested training
program as part of the training plans provided for Syrian volleyball teams. This
recommendation is due to the program’s importance in improving reaction speed, on which
most offensive and defensive skills in this game depends. We have also recommended the
necessity of conducting further research and study, based on modern training methods.
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