When operated as a generator, it does the opposite. This research article proposes the speed control of a separately excited dc motor sedm in the constant torque region. The purpose is to achieve accurate trajectory control of the. In section v, experimental results are illustrated and compared to the simulation results. As the name suggests, in case of a separately excited dc motor the supply is given separately to the field and armature windings. Ssrg international journal of electrica l and electronics. The next section describes and designs the lqr technique. With all the required specifications of the dc motor, a model of the system has been developed using. Direct current motors can be divided into separately excited dc motors, shuntwound dc motors, serieswound dc motors and compoundwound dc motor s. Since the most basic requirement of a motor is that it should rotate at the desired speed, we will require that.
Model equations the dc motor for the suvln is a separately excited. If only 10% of the cycles are used to apply a voltage, the pwm signal is said to be set at 10 fig. Speed control of separately excited dc motor by ppt 2. Separately excited dc motor allows having independent control of both the magnetic flux and the. Model reference controlled separately excited dc motor. Parameter identification of a separately excited dc motor via inverse problem methodology article pdf available in turkish journal of electrical engineering and computer sciences 172. Therefore dc motors are used in fine speed applications such as in paper mills and in rolling mills.
As a basis of building procedure were greybox models made by hofling 1 and juricic 2. The separately excited dc motors are most often used. Mathematical modeling and speed control of bldc motor using ga and pid 1prachi sahu, 2ashish sahu. The separately excited dc motor is typical and always taught at universities. Many authors have done so much work on dc motor speed control using different. A good material for the poles of a pmdc motor should have the apposite of the above. Introduction a series dc motor is a motor whose filed windings consists of a relatively few turns connected in. Dynamic modeling, simulation and control of electric. Model a model is any physical or conceptual representation of an actual material or object, to simplify. In the simple motor model we start off with, the mechanical parameters are completely ignored. The significant feature of separately excited dc motor configuration is its ability to produce high starting torque at low operation speed 2. The dc motor may be a dc series motor or a dc separately excited motor or a pmdc motor.
They are separately excited and self excited dc motor. The electric circuit of the separately excited dc motor is shown in figure 1. In general on the basis of dc motor excitation the dc motor are classified into two types. Motor to be controlled is a separately excited dc motor as shown in figure. The rotor speed of the dc motor can be made to follow an arbitrarily selected trajectory. First consider that our uncompensated motor rotates at 0. Fieldweakening nonlinear control of a separately excited dc motor mohamed zribi and adel alzamel received 17 march 2006. Discussion a dc motor generator can run either as a motor or as a generator. Fieldweakening nonlinear control of a separately excited. This dc motor system is a separately excited dc motor 7, which is often used to the velocity tuning and the. In addition the result obtained shows that at different input voltages, the speed the dc motor is inversely proportional to the load torque. In this project we used separately excited dc motor. Equivalent circuit of shunt wound separately excited.
Design engineers are often faced with having to determine the best dc motor choice for a. Model of seperately excited dc motor file exchange. A field controlled dc motor is a separately excited dc motor where the field current controls the motor torque. A comparative study of the model for the separately excited dc motor has shown that the models have their. Mathematical model of a separately excited dc motor powered by a solar array using external starter resistances article pdf available november 2014 with 1,674 reads how we measure reads. Measurements and mathematical modeling of a dc motor for. Study of nonlinear behavior of dc motor using modeling and simulation nayana p. Modeling, analysis and speed control design methods of a. Finally, conclusions of the paper are summarized in section vi. Modeling and simulation of the dc motor using matlab and labview. Fig2 block diagram of separately excited dc motor model parameters of separately excited dc motor model. Pdf speed control of separately excited dc motor using. A mathematical model of the process has been developed using real plant data and then conventional controllers and fuzzy logic controller has been designed. Parameters can be varied from the initializing function in model properties.
The rest of the paper is presented at first the dc separately excited motor mathematical model is described. M file in matlab, the step response has been generated as fig. Experiment 7 series dc motor i objectives to determine the torquespeed characteristic curve. Different speed can be obtained by changing the armature voltage and the field voltage. Pid controller tuning using zieglernichols method for. This requires building the appropriate laplace model for each component of the whole control system. Mathematical modeling and close loop speed control of separately excited dc motor. Simulation used in education for a separately excited dc motor.
The main objective of this paper is to build a simple mathematical competent model that describes the circuits and interconnections of a 3phase squirrel cage induction motor used for industrial applications. The design method uses the concepts of the system theory, such as signals and systems, transfer functions, direct and inverse laplace transforms. Accepted 30 january 2007 recommended by giuseppe rega this paper investigates the design and implementation of nonlinear control schemes for a separately excited dc motor operating in the. Icmieepi140153 electromechanical modeling of separately. System analysis page where the systems openloop response is simulated. Mathematical modeling and speed control of bldc motor. Mathematical model for constant speed control applications, the supply voltage and frequency are both constants. Modeling and speed control of separately excited dc motor. To obtain the armature voltage vs armature current load curve of the generator. Ssrg international journal of electrica l and electronics engineering ssrgijeee volume 1 issue 6 august 2014 issn. Analysis of speed control of separately excited dc motor. In this report a way of building up the greybox model of dc motor is introduced. Dc separately excited motor math mathematical model as reference we consider a dc separately excited motor as is shown in figure 1. Brushless dc motor is one of a smallscale motor used in small electric devices like cd players, hard disk drives, or even small.
Similarly, the model of the armature winding for this motor is expressed as. Pdf mathematical model of a 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. Speed control of a dc motor using controllers science. Lesson 3 understanding and using dc motor specifications. Speed control of separately excited dc motor by ppt 2 free download as powerpoint presentation. Types of dc motors and their applications electrical4u. When a separately excited motor is excited by a field current of if and an armature current of ia flows in the circuit, the motor develops a back emf and a torque to balance the load torque at a particular speed. In this paper we propose the use of photovoltaic as a power source for dc motors performing a feasibility analysis of this system using simulink, for which we show the mathematical model of a solar array in combination with a dc motor separately excited, including the boot process.
When the motor is at rest, the synchronous rotating field induces e. Moment of inertia of the motor rotor with attached mechanical load, j 0. Yodyium and saksiri 6 set up the neurofuzzy gains by using a self. A antiwindup technique is used in controller to avoid integrator windup problem. Pid controller tuning using zieglernichols method for speed control of dc motor.
Described in articlethis is the simulation of a separately excited motor, includingdc starting, speed control and. The solid lines show the mean velocity produced by each pwm signal. Pdf parameter identification of a separately excited dc. Speed control of a separately excited dc motor engineering. A separately excited dc motor model assuming constant field excitation the arm tuec il q n s wri en as. To study the properties of the separatelyexcited dc shunt generator under noload and fullload conditions 2. International journal of engineering trends and technology. Rodriguez gallegos faculty of electrical engineer and computer science, escuela superior politecnica del litoral campus gustavo galindo km. Mathematical modeling of systems in this chapter, we lead you through a study of mathematical models of. Study of nonlinear behavior of dc motor using modeling and. Waleed and khearia 2 present fuzzy neural model referance controller to control speed of a separately excited dc motor. Modelling and simulation of armaturecontrolled direct. Modeling of dc motor the most common device used as an actuator in mechanical control is the dc motor. Described in articlethis is the simulation of a separately excited motor, includingdc starting, speed control and braking, as well as an analysis of the results.
Fractional order pid controller to study under the fractional order controllers, the starting. The set of equations here reported, constitutes a model of the dc motor, which may 6. This paper presents the detailed analysis of theoretical concepts used in mathematical modeling, simulation and hardware implementation. The novelty of this article lies in the application of artificial neural networkbased model reference controller mrc for the speed control of sedm. Dc motor model the dynamic of the separately excited dc motor may be expressed by the following equations u t dt di t k t r i t l a a. The proper design of closed loop control system depends heavily upon an adequate mathematical model for the most basic component dc motor. Once a mathematical model of a system is obtained, various analytical and. To find out how to reverse the direction of rotation of a series dc motor. Non linear dynamic model of a shunt wound separately excited dc motor system model that are nearly as severe as those presented by fig 3. For example, the control of a rotary inverted pendulum requires a dc motor to drive the arm and the pendulum as shown in figure 21. This paper describes the speed control of a dc shunt motor using conventional controllers pid, imc and fuzzy logic controller based on matlab simulation program. The file simulates the model of 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 winding is energized from a separate external source of dc current as shown in the figure beside.
A comparative analysis of performance evaluation of all controllers has. The system consists of dcdc buck converter to drive the dc motor. Field current speed control of direct current motor using. Electric vehicle modeling utilizing dc motor equations.
Mathematical model of a separately excited dc motor. Zieglernichols method for separately excited dc motor speed control, which leads to improve the transient and steady state of speed responses of separately excited dc motor. Objective is to control the speed of the separately excited dc motor by armature voltage control 14. In addition, we can determine the rotational speed angular velocity of the motor armature at any given voltage. Mathematical model of a separately excited dc motor powered by a solar array using external starter resistances. Pdf modeling and simulation of the dc motor using matlab.
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