Dc series motor pdf

As you already know, there are two electrical elements of a DC motor, the field windings and the armature. The armature windings are made up of current carrying conductors that terminate at a commutator. DC voltage is applied to the armature windings through carbon brushes which ride on the commutator. In small DC motors, permanent magnets can be used for the stator. However, in large motors used in industrial applications the stator is an electromagnet.

For simplicity of explanation, the stator is represented by permanent magnets in the following illustration. The permanent magnet motor uses a magnet to supply field flux.

Permanent magnet DC motors have excellent starting torque capability with good speed regulation. A disadvantage of permanent magnet DC motors is they are limited to the amount of load they can drive. These motors can be found on low horsepower applications. In a series DC motor the field is connected in series with the armature. The field is wound with a few turns of large wire because it must carry the full armature current.

A characteristic of series motors is the motor develops a large amount of starting torque. However, speed varies widely between no load and full load. Series motors cannot be used where a constant speed is required under varying loads.

Series-connected motors generally are not suitable for use on most variable speed drive applications. In a shunt motor the field is connected in parallel shunt with the armature windings. The shunt-connected motor offers good speed regulation. The field winding can be separately excited or connected to the same source as the armature. The shunt-connected motor offers simplified control for reversing.

This is especially beneficial in regenerative drives. Compound motors have a field connected in series with the armature and a separately excited shunt field. The series field provides better starting torque and the shunt field provides better speed regulation. Cant see this video? Click here to watch it on Youtube. Which type are these and what is the difference.If you are finding the possible applications of DC motor in our daily life then you are the right place.

In everyday life, Motors are used with the help of DC supply or A. C supply. In this article, we are going to discuss the applications of DC motor in everyday life.

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C motor is an electrical motor which only runs on dc supply. The traditional DC motor needs two current supplies, one through the stator windings to provide the magnetic field and the other through the rotor windings to interact with the magnetic field to generate the motive force. Currently, series, shunt, and compound motors are used which require only one voltage supply. According to characteristics of dc motormotors are used in the application. Here we will see the types of D.

C motors and their applications. These motors are only used where the variation of speed is possible. So these motors are commonly used in fixed speed applications. Because of that Compound motors are used where we require high starting torque and constant speed. While some may claim that direct-current DC motors are no longer relevant, that is definitely not the case. C motors have some advantages like.

Speed control of dc motor is just simple: only adjust the terminal voltage, often using a local potentiometer. Until the late of the s, when the variable frequency drive was not invented, dc motor was the best option for variable speed application.

C series motor have poor speed control and high starting torque. Speed control of this motor is possible by varying supply voltage. Under no load conditions, the speed will accelerate to dangerous levels which causing the destruction of the motor.

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The motor can be reversed by reversing the connections on either the field or the rotor windings but not both. Regenerative braking is not possible since the field current needs to be maintained but it collapses when the rotor current passes through zero and reverses. This motor can be also reversed by reversing the connections of motor same as a series motor. In this motor, torque can be increasing, without a decrease in speed by increasing motor current.

Characteristic of the compound motor is the combination of both series dc and shunt dc motor. A cumulative compound can develop high starting torque at low speed like a series motor.

This motor can run at reasonable speed and will not run with dangerously high speed like series motor, on light or no load condition. We can also run this motor at a constant speed.

Hope now you understand well about the everyday uses of DC motors. We saw some examples of applications of DC motors also above.

Dc shunt motors are used in constant speed applications. It has the good starting torque and nearly constant speed also. Clear concept by your article. Thank you for this complete solution related to application of DC motor. Thank you sir. Above all information is very helpful for me to better understanding the concept of DC motor…….

Your email address will not be published. This site uses Akismet to reduce spam.DC motor is an electromagnetic device which converts electrical energy into mechanical energy.

DC power input is converted into mechanical power at the shaft motor. This article describes the construction of DC motor. There is no difference in the construction of DC Motor and Generator. They are broadly termed as DC machine. In this post, construction of DC Machine is detailed. A DC machine consists of two main components: Stator and Rotor. Stator is the stationary part whereas rotor is the rotating part.

Rotor consists of armature core, armature winding, commutator and shaft. A labeled diagram of DC machine is shown below.

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Each Stator components of DC machine is described below in detail. Yoke: Yoke is the magnetic core of stator. Apart from this, it provides machenical support to the whole machine. The Yoke of DC machine is not laminated as it carries stationary flux and hence there is no eddy current. Field Poles: Fiedl pole consists of pole core and pole shoe.

The pole core is made from the cast steel. The pole shoe of DC machine is laminated and fixed to the pole core. These Filed Poles are welded or bolted to the Yoke.

Field Winding or Exciting Winding: The pole is excited by a winding wound around the pole core. This winding is called the Field Winding or Exciting Winding and made from copper. The number of turns and cross-sectional of filed winding depends on the type of DC machine as below:. Interpoles: Interpoles are fixed to the Yoke in between the main poles of DC machine.

The interpole winding is made of copper and consists of few turns of thick wire. This winding is connected in series with the armature winding. Compensating Winding: Theses windings are placed in the slots cut in the pole faces of DC machine.

Compensating winding is also connected in series with the armature winding. Brushes: Brushes are housed in the brush holder and connected to the end cover. It is made up of Carbon for small DC machine. For large DC machine, electrographite is used to make brushes. A spring keeps the brushes pressed on the commutator surface.In the present day world, the electrical energy is generated in bulk in the form of an alternating current.

Hence, the use of DC machines, i. They are mainly used in supplying excitation of small and medium range alternators. Now a days, the alternating current is generated first and then it is converted into DC by the rectifiers.

dc series motor pdf

Thus, DC generator has generally been suppressed by a rectified AC supply for many applications. Direct current motors are very commonly used as variable speed drives and in applications where severe torque variations occur.

The series DC motors are used where high starting torque is required, and variations in speed are possible. For example — the series motors are used in Traction system, Cranes, air compressors, Vaccum Cleaner, Sewing machine, etc. The shunt motors are used where constant speed is required and starting conditions are not severe.

The compound motors are used where higher starting torque and fairly constant speed is required. The small DC machines whose ratings are in fractional kilowatt are mainly used as control device such in Techno generators for speed sensing and in Servo motors for positioning and tracking. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Circuit Globe All about Electrical and Electronics. Electronic Instrumentation. Tq fr your valuable content and designed the points in an understandable manner. Leave a Reply Cancel reply Your email address will not be published.A Direct Current Moto r, DC is named according to the connection of the field winding with the armature. Mainly there are two types of DC Motors. The self-excited motors are further classified as Shunt wound or shunt motor, Series wound or series motor and Compound wound or compound motor.

The dc motor converts the electrical power into mechanical power is known as dc motor. The construction of the dc motor and generator are same. But the dc motor has the wide range of speed and good speed regulation which in electric traction. The working principle of the dc motor is based on the principle that the current carrying conductor is placed in the magnetic field and a mechanical force experience by it. The DC motor is generally used in the location where require protective enclosure, for example, drip-proof, the fireproof, etc.

The detailed description of the various types of the motor is given below.

Applications of DC Machines

As the name signifies, the field coils or field windings are energised by a separate DC source as shown in the circuit diagram shown below.

As the name implies self-excited, hence, in this type of motor, the current in the windings is supplied by the machine or motor itself.

Self-excited DC Motor is further divided into shunt wound, and series wound motor. They are explained below in detail. This is the most common types of DC Motor. Here the field winding is connected in parallel with the armature as shown in the figure below. I is the input line current Ia is the armature current Ish is the shunt field current. VI a is the electrical power supplied to the armature of the motor. In the series motor, the field winding is connected in series with the armature winding.

The connection diagram is shown below. The connection diagram of the compound motor is shown below. In cumulative compound motor the flux produced by both the windings is in the same direction, i.

In differential compound motor, the flux produced by the series field windings is opposite to the flux produced by the shunt field winding, i. The positive and negative sign indicates that direction of the flux produced in the field windings. You left out the long-shunt and short shunt compound motor connection.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Circuit Globe All about Electrical and Electronics. Electronic Instrumentation. Separately Excited DC Motor.

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Shunt Wound DC Motor.The series motor has the highest starting torque for a given power rating. When the motor is overloaded, the speed drops and the torque increases. While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC motor. The main applications where series motors are best suited are for traction applications. Torque of the series motor is proportional to square of the field current i.

Therefore Starting torque for the series motor is quite high. Because of this property series motors are widely used in electric traction and in crane application. In fact, opposite of it is true. Thank you for pointing the error.

Your feedback is very important to me as it helps to make the content flawless. And a very big thanks to you for creating the content on this site. I really enjoy reading the topics here, since it was etrical blog. It helps me build my concepts in apt and clear way and that too, in a short amount of time in comparison to books.

dc series motor pdf

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Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Advantages of DC Series Motor: The series motor has the highest starting torque for a given power rating. With increase in the speed, torque of the dc series motor drops sharply. DC series motor should always require being loaded before starting the motor. Therefore series motors are not suited for the application where load on the motor is completely removed and where motors are driving the belts.

Mishap to the belt leads to motor operates on no load and attains dangerous speeds which damage the motor. November 14, at pm. November 15, at am. Leave a Reply Cancel reply Your email address will not be published.

dc series motor pdf

Privacy Policy.The basic principle of the DC motor is a device which converts DC energy into mechanical energy.

Speed of a DC motor can be varied by varying flux, armature resistance or applied voltage. Different speed control methods for different DC shunt and series methods are there. In this flux control method, speed of the motor is inversely proportional to the flux.

Applications of DC Motor [ Series, Shunt & Compound Motor ]

Thus, by decreasing flux and speed can be increased vice versa. This method is quite efficient. So in this method, the speed can be increased by reducing flux, it puts a method to reducing flux with this method, it puts a method to maximum speed as weakening of flux beyond the limits will adversely affect the commutator.

When supply voltage V and armature resistance Ra are kept constant, the Speed is directly proportional to armature current Ia. If we add resistance in series with the armature, the armature current Ia decreases and hence speed decreases. This method is done by inserting the variable resistance Rc in series with the armature. Due to the voltage back in the controller resistance the back EMF is decreased.

Since N is directly proportional to the Eb. Multiple Voltage Control : In this method, the shunt field is connected to a fixed exciting voltage, and the armature is supplied with different voltages. So the Voltage across armature is changed with the help of a suitable switchgear devises. Armature speed is approximately proportional to the voltage across the armature. Ward-Leonard System : This Ward —leonard system is used where very sensitive speed control of the motor is required e.

The arrangement of this system is as required in the figure shown below. M1 may be any AC motor or DC motor with constant speed.

Methods of Speed Control of a DC Motor

G is the generator directly coupled to M1. In this method the output from the generator G is fed to the armature of the motor M2 whose speed is to be controlled. The generator output voltage can be connected to the motor M2 and it can be varied from zero to its maximum value, and hence the armature voltage of the motor M2 is varied very smoothly. Hence very smooth speed control of motor can be obtained by this method. Field Diverter : A Rheostart is connected parallel to the series field as shown in fig a.

Hence flux can be decreased to desired amount and speed N can be increased. For a given constant load torque, if armature current is reduced, then flux must increase. In this method, field coil is tapped dividing the number of turns.


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