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Register a new userEffect of Rotation Speed and Load Current on Commutation and Spark Occurrence in Micro Dc Motors
أثر سرعة الدوران و تيار التحميل في التبديل و ظهور الشرر في محركات التيار المستمر المكروية
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سعيد وهبي( باحث )
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يهدف هذا البحث إلى دراسة تأثير سرعة الدوران و شدة تيار المتحرض أو تيار التحميل لمحرك التيار المستمر المكروي في تيار التبديل فيه، و لاسيما في المرحلة الأخيرة منه التي يظهر خلالها الشرر الكهربائي على مجمع المحرك. ثم الوصول إلى نتيجة بخصوص علاقة زمن الشرر الكهربائي و شدته أو طاقته بسرعة دوران المحرك و بشدة تيار المتحرض. استند البحث إلى تجارب مخبرية خاصة، و توصل في نهايته إلى نتائج عملية مفيدة.
This research aims to study the effect of rotation speed and armature current density or load current of micro dc motors on the commutation current, especially on the final phase where electrical spark occurs on the motor collector. A relationship of how electrical spark time and density or energy is related to rotation speed and armature current density, will be deduced. This research was supported by special laboratory experiments, and ended up with useful scientific results.
References used
H. Fujita Recent Progress of microactuators and micromotors Microsystem Technologies Springer Berlin / Heidelberg June 2005
Junge and Mueller Electro- engineering lexicon Weinheim, New York Basel, Cambridge, Tokyo 2001
E, Jucker Physical behavior of DC- Micro motors free ferrate rotor Porte cap la Chaux- de- Fonds Switzerland 2001
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The consumption of power in the industrial field almost reaches approximately 40%
of the total generated power. One kind of useless consumption of power is the losses in the
electrical motors starting. The impact of the losing power might be ignore
d in the
continuous and short time working systems. However, in case of periodic starting up, the
losing ratio will be exaggerated. Also, the controlling of starting up process will be
considerable and can keep the losses at lowest levels. In this paper, the effect of using the
Semi-conductors controlling system in DC motors on power losses was studied and
compared with control system using resistors starting in periodic short time systems. The
obtained results show that there is a relationship between the power saving in KWh per
year as a function of the rated motor power and the number of starting up per Hour. Due to
conveying from conventional controlling system to modern control system uses semiconductor
rectifier.
The theoretical section presents the principle of
operation of an on-site control circuit using a DC
motor, as the continuous motor is the main element
that rotates at certain angle and thus moves the
action to the gearbox which reduces the engin
e's
rotational speed to control the variable resistance
which adjusts the voltage Vb to be equal to the
voltage Vr
The Practical section displays the results.
A lot of researches studies robot arms and the ability of controlling it to track targets
which depends on the type of motors used, DC motors or servo motors. In addition to
response time that DC and motor can give as a physical structure.
Robots
consists of number of junctions built of solid materials (robot arms(
connected together by motors and the total structure lets the robot to move, these robots
can be used in places that humans cannot act inside it or in places which we need a lot of
repeated actions.
This search aimes to study the robot arm movement by controlling the motors and its
response to a drawn line using a PID controller to achive the most accuracy by using the
distrubushion constants of the camera lens which used by the robot to see. All the cameras
need to be calibrated and the constants used to move the robot in X,Y,Z.
The DC sources like fuel cells, solar cells, storage units need to
raise its output voltage in order to match load requirements. So often these systems are equipped with Power Electronics
techniques in general and DC-DC booster converters in partic
ular.
The paper provides the mathematical model and algorithm for
designing the booster converter with selected values in order to define the values of the most important parameters of its
components including inductor parameters. Based on the developed algorithm, a simulation of the system is conducted in MATLAB / Simulink environment to analyze the impact of changing the inductor inductance on booster performance.
Also the paper includes the mathematical model and algorithm for designing the booster inductor in terms of material, conductor type and shape of core and number of windings. Based on the design results, the inductor has been implemented completely in the laboratory. The inductance of the implemented inductor has been measured using a number of measuring methods to make sure of its value and match it with the theoretical values of design. Finally, the developed algorithm has been translated into a program in an environment Matlab / GUI , with which several computer tests have been performed.
Specialists use many methods to achieve their aimes .These methods help to detect
and correct errors ,in addition to identifying and addressing the weaknesses ,or to add more
effective tools and aids in order to develop the performance .
The kinet
ic analysis methods adopted by the biomechanics are considered one of the
best and most effective methods which help detecting the errors associated with the
performance through evaluating the variables representing the performance specifications.
This study focuses on the determining the values of the pelvis speed , and stretched
bow speed as variables and the speed of Javelin launching and studying the relation
between them. This study applied on five Syrian Javelin throwers from the national team
who participated in Arab and Asian championships.
The study concluded that there was a significant correlation between the speed of
pelvis and the launching speed , and there was no significant correlation between the speed
of stretched bow and the launching speed neither between the speed of pelvis and the speed
of stretched bow. In additionto the low level of the javelin speed lower than world
champion's level .There is a weakness in the using of the kinetic transport and in taking
advantage from the forces resulting from approach .
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