Speed control of shunt and separately excited dc motors by field control method. Characteristic of separately excited dc generator electrical4u. A antiwindup technique is used in controller to avoid integrator windup problem. Modeling and speed control of separately excited dc motor. Close loop control is done in two loop, first inner current loop having currenttorque controller and outer speed controller loop control the speed. The speed of a separately excited dc motor could be varied from zero to rated speed mainly by varying armature voltage in the constant torque region.
It is found to be simple and high effective if the load disturbances is small. Speed control of separately excited dc motor using class a chopper. Pdf speed control of separately excited dc motor and performance analysis by software simulation has been done. The novelty of this paper lies in the application of nonlinear autoregressivemoving average l2 controller for the speed control of sedm. Most of the speed control of dc motor product in the market was using ac as power source.
Sometimes the term independentfield dc motor is also used. For the proposed dc motor case, we recommend 7 fuzzy rules for fuzzy logic controller. Speed control of separately excited dc motor request pdf. In a separately excited dc generator, the field winding is excited by an external independent source. Pdf speed control of separately excited dc motor with. A 240 v, shunt dc motor takes an armature current of 20 a when running at. High starting performance separately excited dc motor. This makes it a necessity to employ a method to effectively control the speed of a separately excited dc motor. This paper presents the speed control of a separately excited dc motor using fuzzy.
Classification of dc motors separately excited and shunt motors. There are generally three most important characteristic of dc generator. The separately excited dc motor can be controlled from. Speed control of dc motor dc motor speed control youtube. For domestic and industrial applications separately excited direct current motors are widely used. The controller consists two parts which is designed to estimate of motor speed and the other is which to generate a control signal for a converter. There is an increase in speed increases until a specific point which is the intersection point in the graph. When power for the stator electromagnet is supplied by a separate dc source, either fixed or variable, the motor is known as a separately excited dc motor.
Pdf control of separately excited dc motor researchgate. Speed control of separately excited dc motor using fuzzy. Fuzzy controller design the objective of this case study is to perform the speed control of a separately excited dc motor figure 1 using fuzzy logic controller flc. Starting analysis of separately excited dc motor by pi. Dc motor ieee conferences, publications, and resources. The speed control of a dc motor with high accuracy is essential. The torquespeed relationship, valid for both shunt and separate excitation, is derived. Scribd is the worlds largest social reading and publishing site.
Traditionally rheostat armature control method was used for low power dc motors. This paper presents the speed control of a separately excited dc. Singleinput fuzzy logic controllers for efficiency maximized separately excited dc motor 10 megha jaiswal, mohna phadnis speed control of dc motor using genetic algorithm based pid controller. Separately excited dc motor, chopper circuit, hysteresis current control, speed control, model reference adaptive controller, fuzzy neural controller. 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. This paper deals with design and implementation of speed controller to control the speed of separately excited dc motor using a class a chopper. What are the applications of a separately excited dc motor. Pdf speed control of separately excited dc motor using chopper. The novelty of this paper lies in the application of. Whereas in the constant power region, field flux should be reduced to achieve speed above the rated speed. 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. Speed control methods of dc motor speed control of shunt motor 1. For both clockwise or anticlockwise speed directions, the absolute value of the motor speed r is compared with the base speed b of the machine. Chopper control of separately excited dc motor circuit globe.
Dec 31, 2017 in this video, i describe how to control the speed of d. The field of this motor is permanently connected across the dc supply lines. Speed torque characteristic of separately excited dc motor. Separately excited dc motor electronic components systems.
Separately excited electronic motor speed controller model 12 sepex curtis model 1266 ar sepex controllers are programmable and microprocessor based, with an advanced mosfet power section for smooth and seamless control of separately excited motors. Characteristics of separately excited dc generators. The driver circuit consists of microcontroller which control the duty cycle of the. Speed control of separately excited dc motor moleykutty. 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 selfexcited 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. Due to this the speed can be controlled for below rated speed and speed above the rated speed, respectively. Jul 11, 2019 as the name suggests, in case of a separately excited dc motor the supply is given separately to the field and armature windings.
Speed control of separately excited dc motor by ppt 2. Weakening of field causes increase in speed of the motor while strengthening the field causes decreases the speed. Pdf speed control of separately excited dc motor using chopper mohammad chessab mahdi academia. Magnetic or open circuit characteristic of separately excited dc generatorthe curve which gives the relation between field current if and the generated voltage e0. Many situations demand change in the speed of the dc motor. Torquespeed characteristic of a shunt or separately excited dc motor ind then, with constant v t, otherwise it affect the torquespeed curve this equation is a straight line with a negative slope. This paper also discusses speed control of a sedm using chopper circuit. Accordingly, the field multiplexer determines the field current signal if. Speed control techniques of separately excited dc motor. Speed control of dc motor dc motor speed control speed control methods of a dc motor can be varied by varying flux, armature resistance. The circuit equation of a speed torque characteristic of separately excited dc motor whose armature, having a total of z conductors, is wound for 2p poles the brushes divide the winding into 2a parallel paths, is. Remove the existing variable load torques and apply a constant load torque of 28 n. Aug 03, 2018 in a separately excited dc generator, the field winding is excited by an external independent source.
The resulting torquespeed characteristic of a shunt dc motor is shown in fig. Types of dc motors and their applications electrical4u. In a separately excited dc motor the supply is given separately to the field and armature windings. The resulting torque speed characteristic of a shunt dc motor is shown in fig. M1 is the main motor whose speed control is required. Jan 09, 2018 in a separately excited dc motor the supply is given separately to the field and armature windings. Simulink separately excited dc motor matlab answers.
The speed of separately excited dc motor is controlled to a maximum of its rated speed using chopper as a converter. 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. The speed of separately excited dc motor can be control by changing the armature voltage and changing field flux. In this article, i will discuss what is separately excited dc motor, applications of separately excited dc motor, speed control methods of separately excited dc motor, circuit diagram of speed control of separately excited dc motor by armature voltage control method, circuit diagram of speed control of separately excited dc motor by field flux control. 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. Speed control of a separately excited dc motor free download as word doc.
K e b o where, kconstant this shows the speed of a dc motor is directly proportional to the back emf and inversely proportional to the flux per pole. The performance of the proposed system has been compared with the traditional one using. Speed control of separately excited dc motor moleykutty george. Torque speed characteristics of the separately excited dc motor at different armature voltages thyristor based techniques of dc motor speed control figure 3 shows a separately excited dc motor fed through single phase half wave converter. Speed control of separately excited dc motor using chopper. This paper describes speed control of separately excited dc motor using chopper as power converter and pi as speed and current controller. 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. Many methods are available to regulate the speed of a separately excited dc motor such as pid control, fuzzy logic control, neural network method. Fuzzy speed control of separately excited dc motor using. Dc motors are widely used in industries for various purposes. Simulation used in education for a separately excited dc motor. 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.
The objective of this paper is to describe the principle of dc motor speed control using. In a separately excited dc motor, separate power is given to the field and the armature windings. Depending upon type, a dc motor either controlled by changing the input current or changing the input voltage. Oct 17, 2014 mathematical modeling and close loop speed control of separately excited dc motor.
In the constant power region, field flux should be reduced to achieve speed above the rated speed. R2 r1, by increasing the resistance to r2, the speed increases. The results are compared with controller tuned by pi, pid and zieglernichols method. Pdf dc motors are exceptionally eminent in various applications where speed is the foremost aspect such as industrial applications, robot manipulators. Separately excited electronic motor speed controller. Jan 26, 2019 speed control of shunt and separately excited dc motors by field control method. The graph shows the torquespeed characteristics of a shunt dc motor.
A new speed control technique for a separately excited direct. In this video, i describe how to control the speed of d. Described in articlethis is the simulation of a separately excited motor, includingdc starting, speed control and. Torque speed characteristic of a shunt or separately excited dc motor ind then, with constant v t, otherwise it affect the torque speed curve this equation is a straight line with a negative slope. So the drawback of conventional controllers when high load has been applied to the dc motor. Speed adjustment of this type of motor is achieved from the following methods. The disadvantage of a separately excited dc generator is the same that we require an external dc source for excitation. The separately excited dc motor can be controlled from below and up to rated speed.
Speed control of a separately excited dc motor engineering essay. The controller will be designed based on the expert knowledge of the system. The armature circuit for a dc machine and two circuit connections for the armature and field circuits, a shunt connected machine and a separately excited machine are presented. Speed control of dc motors speed can be controlled by varying. Certificate this thesis on speed control of separately excited dc motor using fuzzy control logic is presented in completion of partial requirement of bachelors degree in electrical engineering is written by us, t. Speed control of separately excited dc motor speed of this type of dc shunt motor is controlled by the following methods. We can see from the above graph, by increasing the resistance the line becomes steeper. Separately excited dc motor speed control of using various. Speed control of separately excited dc motor and performance analysis by software simulation has been done. 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 winding is energized from a separate external source of dc current as shown in the figure beside. The torque speed relationship, valid for both shunt and separate excitation, is derived. Speed control of separately excited dc motor by ppt 2 free download as powerpoint presentation.
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. Direct current motors can be divided into separately excited dc motors, shuntwound dc motors, serieswound dc motors and compoundwound dc motor s. Speed control of separately excited dc motor by armature. Speed of the motor can be controlled by varying v a and holding v f constant at its rated value. Starting analysis of separately excited dc motor by pi controller. Types of dc motor self excited, separately excited dc motor. But since the output voltage may be controlled more easily and over a wide range from zero to a maximum. Chopper control of separately excited dc motor the chopper converts the fixed dc voltage to variable dc voltage. As the name suggests, in case of a separately excited dc motor the supply is given separately to the field and armature windings. Equivalent electromechanic scheme of separately excited dc motors. Sep 30, 2017 speed torque characteristic of separately excited dc motor. Simplified dc motor with an electromagnet as stator. The graph shows the torque speed characteristics of a shunt dc motor. Yuva radha krishna and kishore biswal under the guidance of dr.
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. 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. Speed control of a separately excited dc motor rectifier. Conventional controllers are generally used to control the speed of the separately excited dc motors in various industrial applications. Pdf speed control of separately excited dc motor with efficiency. Varying the armature voltage in the constant torque region. Speed of the motor can be controlled by varying v a. Abstract the aim of the paper is to control the separately excited dc motor by using the igbt based chopper. Separately excited dc motor speed control using four. Pdf speed control of separately excited dc motor using. The field winding is supplied by a separate dc source whose voltage is variable.
But since the output voltage may be controlled more easily and over a wide range from zero to a maximum, this type of excitation finds many applications. Speed control of separately excited dc motor science. In a separately excited dc generator, the field coils are energized from an independent source. The separately excited dc motor is typical and always taught at universities. The novelty of this paper lies in the application of nonlinear autoregressivemoving averagel2. The results show the superiority zieglernichols method for separately excited dc motor speed control, which leads to. This paper proposes the speed control of a separately excited dc motor varying armature voltage. 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. Speed control of a separately excited dc motor engineering. Speed control of dc motor using chopper slideshare.
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