advantages and disadvantages of ac generator pdf

Advantages And Disadvantages Of Ac Generator Pdf

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Electrical Tachometer

In Alternators are created by Hippolyta Pixii the French inventor. An alternator is defined as a machine or generator which produces AC Alternating Current supply and it converts mechanical energy into electrical energy, so it is also called an AC generator or synchronous generator. There are different types of alternators based on applications and design.

The Marine type alternator, Automotive type alternator, Diesel-electric locomotive types alternator, Brushless type alternator, and Radio alternators are the types of alternators based on the applications. The Salient Pole type and Cylindrical rotor type are the types of alternators based on the design. The main components of an alternator or synchronous generator are rotor and stator. The main difference between rotor and stator is, the rotor is a rotating part and stator is not a rotating component means it is a stationary part.

The motors are generally run by rotor and stator. The stator word based on the stationary and the rotor word based on the rotating. The construction of the stator of an alternator is equal to the construction of the stator of an induction motor. So induction motor construction and synchronous motor construction are both are same. Thus the stator is the stationary part of the rotor and the rotor is the component that rotates inside of the stator. The rotor is located on the stator shaft and the series of the electromagnets arranged in a cylinder causing the rotor to rotate and create a magnetic field.

There are two types of rotors they are shown in the below figure. The meaning of the salient is projecting outward, which means the poles of the rotor are projecting outward from the center of the rotor.

There is a field winding on the rotor and for this field winding will use DC supply. When we pass the current through this field winding N and S poles are created. The salient rotors are unbalanced so the speeds are restricted. This type of rotor used in hydro stations and diesel power stations.

The salient pole rotor used for low-speed machines approximately rpm. The cylindrical rotor is also known as a non-salient rotor or round rotor and this rotor is used for high-speed machines approximately rpm and the example for this is a thermal power plant.

This rotor is made up of a steel radial cylinder having the number of slots and in these slots, the field winding is placed and these field windings are always connected in series.

The advantages of this are mechanically robust, flux distribution is uniform, operates at high speed and produces low noise. The rotor is made up of a cast iron and the stator is made up of silicon steel. The prices of the rotor and stator depend on the quality. All the alternators work on the principle of electromagnetic induction. According to this law, for producing the electricity we need a conductor, magnetic field and mechanical energy.

Every machine that rotates and reproduces Alternating Current. To understand the working principle of the alternator, consider two opposite magnetic poles north and south, and the flux is traveling between these two magnetic poles. In the figure a rectangular coil is placed between the north and south magnetic poles.

The position of the coil is such that the coil is parallel to the flux, so no flux is cutting and therefore no current is induced. So that the waveform generated in that position is Zero degrees. If the rectangular coil rotates in a clockwise direction at an axis a and b, the conductor side A and B comes in front of the south pole and C and D come in front of a north pole as shown in figure b.

So, now we can say that the motion of the conductor is perpendicular to the flux lines from N to S pole and the conductor cuts the magnetic flux. At this position, the rate of flux cutting by the conductor is maximum because the conductor and flux are perpendicular to each other and therefore the current is induced in the conductor and this current will be in maximum position. The conductor rotates one more time at 90 0 in a clockwise direction then the rectangular coil comes in the vertical position.

Now the position of the conductor and magnetic flux line is parallel to each other as shown in figure c. In this figure, no flux is cutting by the conductor and therefore no current is induced. In this position, the waveform is reduced to zero degrees because the flux is not cutting. In the second half cycle, the conductor is continued to rotate in a clockwise direction for another 90 0. So here the rectangular coil comes to a horizontal position in such a way that the conductor A and B comes in front of the north pole, C and D come in front of the south pole as shown in the figure d.

Again the current will flow through the conductor that is currently induced in the conductor A and B is from point B to A and in conductor C and D is from point D to C, so the waveform produced in opposite direction, and reaches to the maximum value.

Then the direction of the current indicated as A, D, C and B as shown in figure d. If the rectangular coil again rotates in another 90 0 then the coil reaches the same position from where the rotation is started. Therefore, the current will again drop to zero. In the complete cycle, the current in the conductor reaches the maximum and reduces to zero and in the opposite direction, the conductor reaches the maximum and again reaches zero.

This cycle repeats again and again, due to this repetition of the cycle the current will be induced in the conductor continuously. This is the process of producing the current and EMF of a single-phase. Now for producing 3 phases, the coils are placed at the displacement of 0 each. So the process of producing the current is the same as the single-phase but only the difference is the displacement between three phases is 0. This is the working principle of an alternator.

Thus, this is all about an overview of an alternator which includes construction, working, advantages, and applications. Here is a question for you what is the capacity of an alternator in cars? What is Alternator? Share This Post: Facebook.

Advantages & Disadvantages of AC power and DC power

It works on the principle of relative motion between the magnetic field and shaft of the coupled device. The relative motion induces the EMF in the coil which is placed between the constant magnetic field of the permanent magnet. The develops EMF is directly proportional to the speed of the shaft. Mechanical and electrical are the two types of the tachometer. The mechanical tachometer measures the speed of shaft regarding revolution per minutes. The electrical tachometer converts the angular velocity into an electrical voltage.

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Linear power supplies are a very familiar power supply since they were the normal standard before switch mode power supplies were introduced into the power supply industry. These power supplies have many benefits and drawbacks depending on the intended application. Advantages for linear mode power supplies include simplicity, reliability, low noise levels and low cost. These power supplies, also known as linear regulators LR , have a very simple design in that they require few components making it an easy device for design engineers to work with. This simplistic design makes linear power supplies more reliable because the low complexity level does not allow for many issues to arise.

In Alternators are created by Hippolyta Pixii the French inventor. An alternator is defined as a machine or generator which produces AC Alternating Current supply and it converts mechanical energy into electrical energy, so it is also called an AC generator or synchronous generator. There are different types of alternators based on applications and design. The Marine type alternator, Automotive type alternator, Diesel-electric locomotive types alternator, Brushless type alternator, and Radio alternators are the types of alternators based on the applications. The Salient Pole type and Cylindrical rotor type are the types of alternators based on the design.

Benefits and limitations of ac generator motors

There are many benefits for AC generator motors such as matching voltages and not requiring a very simple design, but also some drawbacks such as high insulation levels. Most commercial properties largely depend on AC power supplies to operate electrical appliances and equipment that exist on their property. Alternate results from the movement of electric charge through a medium and the direction of this motion varies with time.

AC results from the movement of the electrical charge through a medium. The direction of movement varies over time. This variation is not the case with DC since it only involves a single direction for its movement.

What is an Alternator : Construction, Working and Its Applications
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