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Introduction to DC Machine - ppt download. |
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DKT DC Machine. Upon completion of the chapter the student should downlooad able to:. Principle of magnetic induction in DC machine. In a house, almost every mechanical movement that dc machine ppt free download see around you is caused downpoad an DC direct current motor. Construction of DC machine Cutaway view of a dc motor Stator with poles visible. Construction of DC dc machine ppt free download segments Rotor of a dc motor.
Construction of DC machine Rotor is the mchine part - armature Stator is the stationary part - field Armature coil Brushes Stator: non-moving coil Rotor: rotating part. Loops of wire are wound around slot in a metal читать далее DC machine armature. Frogleg wound armatures. Principle of operation Cont. The dc dc machine ppt free download will be discussed later.
Elementary Generator. The pole pieces are shaped and positioned as shown to concentrate the magnetic field as close as possible to the wire loop. They rotate with the armature.
The generated voltage appears across these brushes. These brushes transfer power dc machine ppt free download the battery to ffee commutator as the motor spins — discussed later in dc elementary generator. The voltage produced in all rotating armatures is alternating voltage.
This is the main difference in their нажмите для деталей. Armature with commutator view. Brushes and commutator. The position is called neutral plane.
The commutator, however, maintains the correct polarity to each brush. This is called rectified Pppt voltage. It does turn on and off, but it never reverses polarity. Since the polarity for each brush remains constant, the output voltage is DC.
Since the loops form a series path, the voltage induced in the loops will add. Effects of additional turns. By adding more armature coils, the ripple effect can be further reduced.
Decreasing ripple in this way increases machhine effective voltage of the output. Effects of additional coils. By varying the input voltage, the field strength перейти на страницу varied. By varying the field strength, the output voltage of the dd can be controlled.
Four-pole generator without armature. DC Machine Equivalent Circuit. Create Presentation Download Presentation. Skip this Video. Loading SlideShow in 5 Seconds. Download Presentation. Share Presentations. Email Presentation to Friend. Upon completion of the chapter the student should be able to: Updated on Mar 22, dc machine ppt free download Download Presentation DC Machine.
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Dc machine ppt free download -
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Provided by: srkark Almost all the electro-mechanical movements we see around us are caused either by an A. Here we will be exploring this kind of motors. This is a device dc machine ppt free download converts DC electrical energy to a mechanical energy. Principle of DC Motor This DC or direct current motor works on the principal, when a current carrying conductor is placed in a magnetic field, opt experiences a torque and has a tendency to move.
This is known as motoring action. If the direction of current in the wire is reversed, the direction of rotation also reverses. When magnetic field and electric field interact they produce a mechanical force, and based on that the working principle of dc motor established. Structurally dc machine ppt free download construction wise a direct current motor is exactly similar to a DC generator, but electrically it is just the opposite. Here we unlike a generator we supply electrical energy to the input port and derive mechanical energy from the output port.
We can represent it by the block diagram shown below. The input and output port variables of the direct current motor are related by the parameter K. So from the picture above we can well understand that motor is just the opposite phenomena of a DC generator, and we can derive both motoring and generating operation from the same machine by simply reversing the ports.
T KI and EKW 6 Detailed Description machnie a DC Motor To understand the DC motor in details lets consider the diagram below, 7 The direct current motor is represented by the circle in the center, источник статьи which is mounted the brushes, where we connect the external terminals, from where dc machine ppt free download voltage is given. On dc machine ppt free download mechanical terminal we have tree shaft coming out of the Motor, and connected to the armature, and the armature-shaft is coupled to the mechanical load.
On the supply terminals we represent the armature resistance Ra in series. Now, let the input voltage E, is applied across the brushes. Electric current which flows through the rotor armature via brushes, in presence of the magnetic field, produces dc machine ppt free download torque Tg.
Due to this torque Tg the dc motor armature rotates. As the armature conductors are carrying currents and the armature rotates inside the stator magnetic field, it also produces an emf Eb in the manner very similar to that of a generator.
The generated Emf Eb is directed opposite to the supplied voltage and is known as the back Emf, as it counters the forward voltage. That is whenever a direct current motor rotates, it results in the generation of back Emf. Now lets represent the rotor speed by?
So Eb is proportional to?. So when the speed of the motor is reduced by the application of load, Eb decreases.
Thus the voltage difference between supply voltage and back emf increases that means E - Eb increases. Due to this increased voltage difference, armature current will increase and therefore torque ссылка на подробности hence speed increases.
Thus a DC Motor is capable of maintaining the same speed under variable load. По этой ссылке dc machine ppt free download result we need to use dc machine ppt free download starter for starting a DC Motor. Now as the motor continues to rotate, the back Emf pt being generated and gradually the current decreases as the motor picks up speed.
Working Principle of DC motor A DC motor in simple words is a device that converts direct current electrical energy into mechanical energy. Its of vital importance for the industry today, and is equally important for engineers to look into the working principle of DC motor in details that has been discussed in feee article. In order to understand the operating principle of dc motor we need to first look into its constructional feature.
Now to go into the details of the operating principle of DC motor its important that we have a clear understanding of Flemings left hand rule to determine the direction of force acting on the armature dlwnload of dc motor. Flemings left hand rule says that if we extend the index finger, middle finger and thumb of our left hand in such a way that the current carrying conductor is placed in a magnetic field represented by the index finger is взято отсюда to dc machine ppt free download direction of current represented by the middle fingerthen the conductor experiences a force in the direction represented by the thumb mutually perpendicular to both the direction of ffee and the current in the conductor.
We know that when an infinitely small charge dq is made to flow at a velocity v under the influence of an electric field E, and a magnetic field B, then the Lorentz Force dF experienced by the charge is given by- 14 dF dq E Vb For the operation of dc motor, considering E 0 dF читать далее i.
Where machone is the length of the conductor carrying charge q. Hence the force acts on the armature conductor in the direction perpendicular to the both uniform field and current is constant. So if we take the current in the left hand приведу ссылку of the armature conductor to be I, and current at right hand side of the armature conductor to be - I, because they are flowing in the opposite direction with respect to each other.
Then the force dc machine ppt free download the left hand side armature conductor, Similarly force on the right hand side conductor 16 we can see that at that position the force on either side is equal in magnitude but opposite in direction. And since the two conductors are separated by some distance w width of the armature downlosd, the two opposite forces machie a rotational force or a torque that results in the rotation of the armature conductor.
Now let's examine the expression of torque when the armature turn crate an angle of a with its initial position.
The torque produced is given by, 17 Where a is the angle between the plane of the armature turn and the plane of reference or the initial position of the armature which is here along the direction of magnetic field. The presence of the term cosa in the torque equation very well signifies that unlike force the torque at all position is not the same. It in fact varies with the variation of the angle a. To explain the variation of torque and the principle behind rotation of the motor let us do a step wise analysis.
Since a 0, the term cos a 1, or the maximum value, hence torque at this position is maximum given by t BILw. This high starting torque helps in overcoming the initial inertia of rest of the dc machine ppt free download and sets it into rotation.
Consequently dc machine ppt free download term cosa decreases and also the value of torque. The torque acting on the conductor at this position is given by, 21 i.
But still the armature does not come to a standstill, this is because of the fact that the operation of dc motor has been engineered in dc machine ppt free download a way that the inertia of motion at this point is just enough df overcome this point of null torque.
Once the rotor crosses over this position больше на странице angle between the actual position of the armature and the initial plane again decreases and torque starts acting on it again. Latest Highest Rated. About the Developers PowerShow. Related More from user. CrystalGraphics Presentations. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from.
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Many of them are also animated. El motor - El motor Un motor es una m quina que transforma la energ a qu mica combustible en mec nica. Motor Cognition - Motor Cognition Overview Many people believe processes used dc machine ppt free download plan and enact a movement can be used in problem solving and reasoning Moreover, the processes involved PowerPoint PPT presentation free to view.
Introduction Permanent Dc machine ppt free download DC motors are increasingly being used ppt a wide spectrum of applications such as domestic equipments Denver electric motor repair - Rotating Mechanical Solutions Corp.
Visit us today for more information. Cost 2. Thermal capacity 3. Efficiency 4. In a traditional electric motor, the rotor rotating part spins inside the stator static doqnload ; in a linear motor, the stator is unwrapped and laid out flat and the "rotor" moves past it in a straight line. Linear motors often use superconducting magnets, which are cooled to low temperatures to reduce dc machine ppt free download consumption PowerPoint PPT presentation free to view.
It is an effective speed control method. Motor - Motor Mechanical Energy Motor Rewinding in chennai Power Plant Motor in Chennai - yuvaraj electrical We are very proud to be as a service contractor for Motors. We offer the same quality electrical work for so many years. Electric Motor Manufacturing Plant Project Report PPT - Expansion in industrial automation represents one of the significant factors propelling dc machine ppt free download growth of the market.
Additionally, technological advancements have enabled manufacturers to introduce compact, stronger, and more efficient variants, such as axial-flux electric motors. Apart from this, the rising purchasing power of individuals, along with initiatives undertaken by governments of numerous countries to boost the sales of electric vehicles EVs for minimizing carbon emissions, is anticipated to strengthen the growth of dc machine ppt free download market.
The high adoption rate of electric vehicles arising from rising oil rfee issues, global warming, and environmental pollution is also likely to boost demand for the product. In machune, various government programs aimed at перейти на страницу the production and use of EVs will further stimulate demand. Brushless DC motors offer advantages such as lower rotor heat, higher efficiency, low maintenance costs, operating speed and peak point performance, and rapid response, making it ideal for a wide range of applications, particularly in electric and hybrid vehicles.
Electric motors are used to transfer electrical energy to mechanical energy, most commonly by the use of electromagnetic phenomena. Electric motors of different sorts, including as AC motors, DC motors, Hermetic motors, synchronous ac motor and others, are widely used. Induction Motor Protection System - This Ppt exlains how protect an induction motor from single phasing and over temperature.
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