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Register a new userThe Use of Partial Relative Indicators (PRI) as a detection For Exploring The Faults In Induction Motors
استخدام المؤشرات الجزئية النسبية PRI كمؤشر لاكتشاف الأعطال في المحركات التحريضية
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Aِl-Baath University ورقة بحثية
Publication date
2018
fields
Electrical Power Engineering
and research's language is
العربية
Authors
غانم السمان( باحث )
Created by
Shamra Editor
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اعتمد البحث تجريبيا على استخدام مفهوم المؤشر الجزئي النسبي PRI للتوافقيات الناتجة كمؤشر جديد للعطل و ذلك من خلال تحديد مؤشر نسبي P1 لكل نوع من أنواع التوافقيات الناتجة خلال عمل المحرك عند حمولات مختلفة.
The research was depended on the concept of Partial Relative Indicators (PRI) for the resulting harmonics as a new way to detect the fault through determination of relative indicator PI of each type of harmonics that result during the operation of motor at the different loads.
References used
Y. Han and Y. H. Song, "Condition Monitoring Techniques for Electrical Equipment – A Literature Survey", IEEE Trans. on Power Delivery, vol. 18, no. 1, pp. 4-13, Jan. 2003
H. Henao, H. Razik and G. A. Capolino, "Analytical Approach of the Stator Current Frequency Harmonics Computation for Detection of Induction Machine Rotor Faults," IEEE Trans. on Industry. Application, vol. 41, no. 3, pp. 801-807, 2005
S. Grubic J.M. Aller, B. Lu and T.G. Habetler., "A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems," IEEE Trans. on Industrial. Electronics, vol.55, no.12, pp. 4127-4136, Dec. 2008
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The deep-well pumps are practically and widely used to pump water up
from wells. These pumps are driven by squirrel-cage induction motors
where the pump is directly connected with the induction motor it drives.
They form a pump-motor set or a deep
-well set.
Economioally, the cost of digging a well proportionates with the diameter
of the hole opening.
This diameter is related to the deep-well set dimensions. Whenever the
dimensions of the deep-well set are small, the cost of digging a hole will
be notably less.
From here, in this research we shall test the possibility of desiging a
deep-well induction motor with a voltage of f =150 Hz frequency in a
small size. and in trifold speed of the induction motor which has same
power and functions as the motor with a voltage of f = 50 Hz frequency
and where the essential parameters of the motor aren’t worse than the
motor with f = 50 Hz Frequency.
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.
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.
To clarify the possibility of using bacterial flora as a pollution indicator,
water samples from river were collected and analyzed from July ١٩٩٩ to
February ٢٠٠١ for dissolved oxygen (DO), NO٣-N, NO٢-N, NH٤-N, PO٤-P,
suspended solids (SS), biolog
ical oxygen demand (BOD) Heterotrophic Bacteria
were identified to genus level, and another part of it was identified to
Enterobacteriaceae.
The Control strategy for linear switched reluctance motor elevator is an important
issue, which effects on the performance of the elevator .
This strategy consists of four control loops , Current , Force , Velocity and position
feedback control lo
ops . For the force control loop , anew force distribution function
( FDF) is proposed . The trapezoidal velocity profile is introduced to control the vertical
movement position smoothly during the elevator's accelerate, decelerate and halt
operations.
Conventional proportional plus integral (pI) controller is used for the current and
velocity control loops and their designs are described .
The proposed control strategy is dynamically simulated by Matlab .
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