Identify and utilize equations that represent motor performance to solve separately excited dc motor problems. Moment of inertia of the motor rotor with attached mechanical load, j 0. Keywords separately excited dc motor, buck converter, snubber circuit matlabsimulink introduction as there are two methods of speed control of dc motor these are field control method and armature control method. R2 r1, by increasing the resistance to r2, the speed increases. Speed control of separately excited dc motor using triac. When dc voltage is applied to motor, current is fed to armature winding through brushes and commutator.
Many dc motors use an electromagnet for the stator, as illustrated in figure 27. Pdf speed control of separately excited dc motor using chopper. Dc to dc buck converter separately excited dc motor system model are smoothly starting by using proportional integral pi and resistance starter. This paper presents the speed control of a separately excited dc motor using fuzzy. Speed control of separately excited dc motor and performance analysis by software simulation has been done. Speed control of dc motor using power electronic switch. The speed separately excited dc motor can be control by varying the armature voltage and varying field flux. Many authors have done so much work on dc motor speed control using different types of approaches depending on the. Depending upon type, a dc motor either controlled by changing the input current or changing the input voltage. A dc motor has a current carrying coil placed in a magnetic field and hence the coil armature experiences a force in accordance with flemings left hand rule. Smooth control of speed may not be obtained by using these methods. The motor drive shown is a speed controlled system. Separately excited electronic motor speed controller.
The electric equivalent circuit of the armature and the freebody diagram of the rotor are shown in the following figure. Speed control of separately excited dc motor using chopper. In the constant power region, field flux should be reduced to achieve speed above the rated speed. Arockia edwin xavier thiagarajar college of engineering,electrical and electronic engineering madurai,tamil nadu email. The name suggests the construction of this type of motor. The speed control of a dc motor with high accuracy is essential. This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. Model reference controlled separately excited dc motor. Volume 3, issue 1, july 20 separately excited dc motor. Speed torque curves of single phase half controlled rectifier fed separately excited motor 3three phase fully controlled rectifier control of dc separately excited motor thyristor are fired in the sequence of their numbers with phase difference of 60.
The separately excited brushed dc motor lends easily to simple control, by virtue of the brush commutator which offers decoupled control via. Abstract the aim of the paper is to control the separately excited dc motor by using the igbt based chopper. The separately excited dc motor can be controlled from. Starting analysis of separately excited dc motor by pi. Also the speed control of dc motor it may use in different applications, such as lathes, fans, pumps, disc and band saw drive requiring moderate, torques, electric traction, high speed tools, etc.
It is found to be simple and high effective if the load disturbances is small. The aim of this research is to control the speed of a separately excited dc motor using armature voltage control method and the objective is to design and build an effective fuzzy logic controller for the dc motor speed control. Some dc machines are constructed with a permanent magnet pm field, which results in a constant flux. Using the block from the library, with internal parameter ra0. This paper proposes the speed control of a separately excited dc motor varying armature voltage. There is an increase in speed increases until a specific point which is the intersection point in the graph. May 07, 2014 speed control of separately excited dc motor exp no 1 set 1. This research article proposes the speed control of a separately excited dc motor sedm in the constant torque region. In a wound field machine, the flux is produced by a field winding. Jul 11, 2019 often we want to control the speed of a dc motor on demand. Separately excited dc motor speed control using four quadrant.
Speed control of sexzparately excited dc motor using power. Types of dc motor self excited, separately excited dc motor. Speed control of shunt and separately excited dc motors by field control method. Describe briefly the method of speed control available for dc motors.
Separately excited direct current motor operating efficiency is optimized through the control of the motor field controlled rectifier as a function of actual motor load torque, actual field current and. Tarun agarwal is the chief customer support officer at. Starting analysis of separately excited dc motor by pi controller. Dc motors are widely used in industry because of its low cost, less complex control structure and wide range of speed and torque. The field of motor is connected directly to the power supply for the speed control. So, here we discuss close loop control and pid control of separately excited dc motors. Speed control of separately excited dc motor with efficiency maximization. The separately excited dc motors are most often used. Traditionally rheostat armature control method was used for low power dc motors.
Antar technical college mosul abstract this paper describes the application of acac dc and ac dc converters to control the speed of a separately excited dc motor. In a separately excited dc motor, separate power is given to the field and the armature windings. Introduction the variable speed, reliability and high performance are three main characteristics of an electric drive system due to which it can be easily controlled. Speed control of separately excited and shunt dc motors. We can see from the above graph, by increasing the resistance the line becomes steeper. The variable dc voltage is controlled by varying the on.
Separately excited dc motors have themselves been designed, so that, a generic model can be presented, which can be changed as per needs and constructions of actual motors used in practice. Compound motors has both shunt and series field so it combines features of series and shunt. Dakheel university of technology electromechanical eng. International journal of science and research ijsr is published as a monthly journal with 12 issues per year. This intentional change of drive speed is known as speed control of a dc motor. A antiwindup technique is used in controller to avoid integrator windup problem. Closed loop control, separately excited dc motor and dc motor.
This is different to speed regulation where the speed is trying to be maintained or. Dc motor with speed and current closed loops, driven by etpu on mcf523x, rev. Speed control of separately excited dc motor using self tuned fuzzy pid controller submitted by prahlad kumar sahoo and nirmal kumar barik in partial fulfillment of the requirements for the award of bachelor of technology degree in electrical engineering at the national institute of technology rourkela deemed university, is an. In a separately excited dc motor the supply is given separately to the field and armature windings. Speed control methods of dc motor speed control of shunt motor 1. Speed control of a dc motor is either done manually by the operator or by means of an automatic control device. A common actuator in control systems is the dc motor.
Speed of dc motor can be varied by following methods armature voltage control for below base speed field flux control for above base speed armature resistance control here, we are using armature voltage control method for speed control. For this example, we will assume that the input of. A separately excited dc motor and a dc shunt motor are similar in construction and in all aspects except the way in which the field winding is excited in both the machines. This paper describes speed control of separately excited dc motor using chopper as power converter and pi as speed and current controller.
Presentation on ieee topic, speed control of dc motor using triac. Working of separately excited dc motor separately excited dc motor has field and armature winding with separate supply voltage. Speed control of separately excited dc motor by ppt 2 free download as powerpoint presentation. Series motors field and armature windings are connected in series. The converter output is applied to the armature controlled dc motor. Speed control of separately exited dc motor youtube. The singlephase half wave rectifier feeding a separately excited dc motor drive provides the onequadrant operation and is used in the drive system. Speed control of dc motor using acac dc converter based on intelligent techniques rakan kh. Motor to be controlled is a separately excited dc motor as shown in figure.
The objective of the paper is to control the separately excited dc motor by using the igbt based chopper. Notably, it is a referred, highly indexed, online international journal with high impact factor. Field current speed control of direct current motor using. Speed control of separately excited dc motor by ppt 2. Chopper control of separately excited dc motor circuit globe. For domestic and industrial applications separately excited direct current motors are widely used. Figure 1 from speed control of separately excited dc. Its quite simple to understand if you look at a dc motors working principle.
We will consider three types of wound field dc machine. In a separately excited dc generator, the field winding is excited by an external independent source. Separately excited dc motor shunt dc motor permanent magnet dc motor. There are generally three most important characteristic of dc generator. Write a power balance for a separately excited motor and compute its efficiency. Simulink model of a closed loop speed control of d. In this lab experiment, the dc motor speed control was studied.
The technique of dc motor speed control figure 3 shows a separately excited dc motor fed through single phase half wave converter. Explain how changing motor load affects efficiency. Speed control of separately excited dc motor using different. Speed control of a separately excited dc motor engineering essay. Pdf speed control of separately excited dc motor with. Dc motor with speed and current closed loops, driven by etpu. The speed of separately excited dc motor can be control by. In a pm dc machine, the armature circuit model is the complete circuit model. What are the applications of a separately excited dc motor.
The thyristor bridge converter gets its ac supply through a three phase transformer and fast acting ac contactors. Selfcommutated devices directly on or off devices via gate like mosfet, igbt, power transistors, gto and igct are used for making choppers because they can be commutated by low power control signal and do not need commutation circuit. Speed control of dc motor using chopper slideshare. Electrical machines for mechatronics laboratory 7 4 speed control of series dc motors unlike with the shunt dc motor, there is only one efficient way to change the speed a series dc motor. Speed control of separately excited dc motor using self tuned fuzzy pid controller submitted by prahlad kumar sahoo and nirmal kumar barik in partial fulfillment of the requirements. The speed of separately excited dc motor can be control by changing the armature voltage and changing field flux. The separately excited dc motor has some advantages compare to the others type of motors and there are some special qualities that have in anns and because. Separately excited dc motor has field coils similar to that of shunt wound dc motor.
The significant feature of separately excited dc motor configuration is its ability to produce high starting torque at low operation speed 2. So the drawback of conventional controllers when high load has been applied to the dc motor. Due to all the limitations of the above mention speed control methods, this encouraged me to take up the challenge to develop a speed controller well suited to use in separately excited dc motor. Dc motors, generators and energy conversion devices. The aim of the paper is to control the separately excited dc motor by using the igbt based chopper. Armature resistance control and field flux control the dc motor converts the mechanical power into dc electrical power. Speed torque characteristic of separately excited dc motor. Artificial neural network and pi controller are trained to. Previously, you saw that a dc motor is made up basically of a fixed magnet stator and a rotating magnet rotor. The separately excited dc motor can be controlled from below and up to rated speed. This is another important feature of the dc machine. Praveen kumar3, associate professor, mrec abstract this project presents a comparison of performance of controllers such as pi, pid controller, self tuned fuzzy controller for dc motor speed control. The objective of this paper is to describe the principle of dc motor speed control using.
A fuzzy logic controller was designed to vary the motor s speed by varying the armature voltage of the separately excited dc motor in the constant torque region below the rated speed. Separately excited dc motors sedc in every dc motors, there is a stator that refers to the static part consisting of the field winding, and the rotor which is the moving part consisting of the armature winding. A new speed control technique for a separately excited direct. Varying the armature voltage in the constant torque region. Speed control of separately excited dc motor with efficiency maximization propensity. What is the difference between armature voltage control. With the the increasing use of power semicondutor units, the speed control of dc motor is increasingly getting sophisticated and precise. Analysis of speed for separately excited dc motor using. What is the practical difference between a separately. The novelty of this article lies in the application of artificial neural networkbased model reference controller mrc for the speed control of sedm. The novelty of this paper lies in the application of.
Conventional controllers are generally used to control the speed of the separately excited dc motors in various industrial applications. Most of the speed control of dc motor product in the market was using ac as power source. Speed control of dc motor using artificial neural network. Pdf speed control of separately excited dc motor using. One of the most important features of the dc motor is that their speed can easily be control according to the requirement by using simple methods. Usually, in other dc motors, the field coil and the armature coil both are energized from a single source. Speed control of separately exited dc motor using artificial neural network a. The main distinguishing fact in these types of dc motor is that, the armature current does not flow through the field windings, as the field windin. A same dc machine can be used as a motor or generator. Speed control of a separately excited dc motor free download as word doc. Magnetic or open circuit characteristic of separately excited dc generatorthe curve which gives the relation between field current if and the generated voltage e0.
Dc motors are frequently used with motor controllers for the parts which. That method is to change the terminal voltage of the motor. Speed control of separately excited dc motor moleykutty george. Torque speed characteristics of the separately excited dc motor at different armature voltages 3. Pdf irjetspeed control of separately excited dc motor.
The application meets the following performance specifications. Separately excited dc motor speed control using four quadrant chopper rishabh abhinav, jaya masand, piyush vidyarthi, gunja kumari, neha gupta abstract the speed of separately excited dc motor can be controlled from below and up to rated speed using chopper as a converter. Modeling and speed control of separately excited dc motor. Speed control of separately excited dc motor request pdf. For the love of physics walter lewin may 16, 2011 duration. Speed control of a separately excited dc motor engineering. This paper presents a simulation of the speed control of a separately excited direct current motor sedm using fuzzy logic control flc in matlabsimulink environment. Dc motor drive the control schematic of a twoquadrant converter controlled separately excited dc motor drive is shown in figure 1. Oct 17, 2014 mathematical modeling and close loop speed control of separately excited dc motor.
Conclusion the dc motor speed control has been successfully analyzed using chopper as a power controller and speed and current controller proportionalintegral type based on the closed loop. Due to this the speed can be controlled for below rated speed and speed above the rated speed, respectively. Draw a circuit model of a separately excited dc motor. The transfer function model of the motor is then used to design the pid controller to generate a set of coefficients associated with the desired controller characteristics. This paper describes a matlabsimulink realization of the direct current dc motor speed control method by controlling the voltage applied to the field circuit of a separately excited dc motor in.
Shunt motor is the most common types of dc motor where we connect the field winding parallel with the armature windings so this motor can be self excited from the armature windings and this gives it the feature of greatest speed regulation, simplified reversing control and low starting torque, so shunt motor is suitable for beltdriven. Abstract this paper proposes implementing intelligence techniques to improve efficiency speed control of separately excited dc motor sedm. In a separately excited dc motors, field winding is excited from a separate source, and the armature is excited from another supply. Here a separately excited dc motor drive system is fed through singlephase half wave converter for the analysis. Close loop control is done in two loop, first inner current loop having currenttorque controller and outer speed controller loop control the speed. The motor drive shown is a speed controller system. Speed control of dc motor using acacdc converter based on. Chopper control of separately excited dc motor the chopper converts the fixed dc voltage to variable dc voltage. Different speed can be obtained by changing the armature voltage and the field voltage. Conclusion in this lab experiment the dc motor speed control.