May 07, 2014 speed control of separately excited dc motor exp no 1 set 1. Jul 11, 2019 speed control of a dc motor is either done manually by the operator or by means of an automatic control device. Oct 17, 2014 mathematical modeling and close loop speed control of separately excited dc motor. This is another important feature of the dc machine. Dc motor with speed and current closed loops, driven by etpu on mcf523x, rev. Volume 3, issue 1, july 20 separately excited dc motor. Dc motors are widely used in industries for various purposes. This makes it a necessity to employ a method to effectively control the speed of a separately excited dc motor. The significant feature of separately excited dc motor configuration is its ability to produce high starting torque at low operation speed 2. Direct current dc motors have been widely used in many industrial applications such as electric vehicles, steel rolling mills, electric cranes, and robotic. This research article proposes the speed control of a separately excited dc motor sedm in the constant torque region.
Varying the armature voltage in the constant torque region. Speed control of separately excited dc motor moleykutty george. The equivalent circuit of separately excited dc motor is as follows. Vir viraa aaa k zp where ra armature circuit resistance. Keywordsseparately 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. Speed control of separately excited dc motor using different control techniques utsav n makwana department of electrical engineering mec basna gujarat india abstractuses of d. Introduction the speed control of separately excited dc motor is carried out by varying the armature voltage for below rated speed and by varying field flux to achieve speed above the rated speed. In the constant power region, field flux should be reduced to achieve speed above the rated speed. Analysis of speed control of separately excited dc motor. Separately excited dc motor speed control using four quadrant. The separately excited dc motors are most often used. Description curtis pmc model 1268 sepex controllers are programmable and microprocessor based, with an advanced mosfet power section for smooth and seamless control of separately. Complete layout for dc motor speed control 2problem statement. Model reference controlled separately excited dc motor.
Fig2 block diagram of separately excited dc motor model parameters of separately excited dc motor model. We can also control the dc motor, that is vary its speed by varying the field flux. Smooth control of speed may not be obtained by using these methods. 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. Nov 19, 2015 contents introduction mosfet chopper separately excited dc motor block diagram matlab simulations, results hardware design 3. Synchronisation, speed and direction control of dc motor.
Speed control of separately excited dc motor using chopper. Speed control of shunt excited motors a by changing field resistance b by changing armature voltage field control voltage control. Speed control of dc motor using matlab linkedin slideshare. Different speed can be obtained by changing the armature voltage and the field voltage. In general, the dc motor losses are divided into the followings 12. Sdomain block diagram of separately excited dc motor a. Dc motor with speed and current closed loops, driven by. A dc motor considered a single input single output system having torquespeed characteristics compatible with most mechanical loads. Speed control techniques in separately excited dc motor. It is obvious that the speed can be controlled by varying i fluxpole. Flux control ii resistance ra of armature circuit rheostatic control and iii applied.
Speed control of dc motor using chopper linkedin slideshare. Write a power balance for a separately excited motor and compute its efficiency. A dc motor is any of a class of rotary electrical motors that converts direct current electrical. Speed control of separately excited dc motor by ppt 2. Speed control of separately excited dc motor using. Speed control of dc motor is the most important feature we interest in, when we control the speed we vary it according to the requirements and the operation we need. Speed control of separately excited dc motor by ppt 2 free download as powerpoint presentation.
Ncx controller for stock separately excited dc motors 1111 cheney creek road grants pass, oregon 97527 waterproof corrosion proof vibration proof the leader in performance and durability a n e n g i n e e r e d s o l u t i o n alltrax inc. When the wide speed range of control is needed, the dc motors are employed separately excited dc motor has. The speed separately excited dc motor can be control by varying the armature voltage and varying field flux. Field current speed control of direct current motor using. Motor to be controlled is a separately excited dc motor as shown in figure. Speed control of separately excited dc motor using fuzzy. A separately excited dc motor with name plate ratings of 300kw, 40 0v dc, 50 radsec is used in all simulations.
Close loop control is done in two loop, first inner current loop having currenttorque controller and outer speed controller loop control the speed. Separately excited dc motors are suitable for control applications because of separate field and armature circuit. R eferences 1 moleykutty george speed control of separately. Factors controlling motor speed it has been shown earlier that the speed of a motor is given by the relation n. Traditionally rheostat armature control method was used for low power dc motors. The final transfer function of separately excited dc motor is as follows. 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. A dc motors speed can be controlled over a wide range, using either a.
Pdf speed control of separately excited dc motor using chopper. The method of control is generally used when the motor has to run above its rated speed. Close loop control is done in two loop, first inner current loop having current torque controller and outer speed controller loop control the speed. Controlling speed of dc motor with fuzzy controller in. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. The converter output is applied to the armature controlled dc motor. Large dc motors with separately excited fields were generally used with. Dc motors, generators and energy conversion devices. Many situations demand change in the speed of the dc motor.
The motor drive shown is a speed controller system. The separately excited brushed dc motor lends easily to simple control, by virtue of the brush commutator which offers decoupled control via. Modeling and speed control of separately excited dc motor. The thyristor bridge converter gets its ac supply through a three phase transformer and fast acting ac contactors. 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. Dc motor drive the control schematic of a twoquadrant converter controlled separately excited dc motor drive is shown in figure 1. Speed control of separately excited dc motor using different. Two ways to control dc separately excited motors are. The speed control of separately excited dc motors by pi and pid controller is widely used in industry. The application meets the following performance specifications. Motor have been varied, and have been used for several decades. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Describe briefly the method of speed control available for dc motors. Separately excited dc motor optimal efficiency controller ijeit.
A antiwindup technique is used in controller to avoid integrator windup problem. The novelty of this article lies in the application of artificial neural networkbased model reference controller mrc for the speed control of sedm. Many authors have done so much work on dc motor speed control using different types of approaches depending on the. Speed control of a dc motor is either done manually by the operator or by means of an automatic control device. The objective of the paper is to control the separately excited dc motor by using the igbt based chopper. Speed control of separately excited dc motor request pdf.
A separately excited dc motor with name plate ratings of 300kw, 40 0vdc, 50 radsec is used in all simulations. Simulink separately excited dc motor matlab answers. You can sense the effect of speed control of dc motor in the movement of robotic. Identify and utilize equations that represent motor performance to solve separately excited dc motor problems. 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. The phase controlled converter or thyrist shunt motor or separately excited dc motor and t dc series motor. Separately excited dc motor speed control using four. The torquespeed relationship, valid for both shunt and separate excitation, is derived. Pdf speed control of separately excited dc motor using. The pmdc consists of rotor or armature and a stator, which is a permanent magnet. The objective of this paper is to describe the principle of dc motor speed control using. Speed control of dc drives pdf dc motor speed control is carried out by use of four quadrant chopper drive. That method is to change the terminal voltage of the motor. Dc motor drive the control schematic of a twoquadrant converter controlled separatelyexcited dc motor drive is shown in figure 1.
A same dc machine can be used as a motor or generator. To understand the operation of field control suppose that the dc motor running at a constant speed. He has 8 years of experience in customer support, operations and administration. Modeling and speed control of separately excited dc motor file. Full text of speed conrol of separately excited dc motor using fuzzy technique see other formats aceee int.
The speed control system was implemented for a permanent magnet dc motor pmdc. Pdf speed control of separately excited dc motor with. 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. This is different to speed regulation where the speed is trying to be maintained or regulated against the natural change in speed due to a change in the load on the shaft. Speed control of separately excited dc motor and performance analysis by software simulation has been done. Mathematical modeling and close loop speed control of separately excited dc motor.
The basic difference between the two types is that self excited dc motor is initiated by its own field circuit while separately excited dc motor is initiated by an external input supply. Speed control of separately excited dc motor, american journal of applied sciences 5, 2008 science publications 2 anonymous, speed and direction control of dc motor using pic microcontroller using pwm and hbridge. Tachogeneratorless speed control of seperately excited dc. The proposed method, is very efficient and could easily be extended for other global techniques. Dc motors are widely used in control applications like robotics, tape drives, machines and many more. Speed control of a separately excited dc motor engineering essay. Tarun agarwal is the chief customer support officer at edgefx technologies pvt ltd.
Moment of inertia of the motor rotor with attached mechanical load, j 0. Explain how changing motor load affects efficiency. The motor drive shown is a speed controlled system. With the revolution in modeling and simulation techniques, most of the concepts. Speed control of separately exited dc motor using artificial. 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. 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. Controller is used to maintain a motor speed at predetermined level running at different load torque. A dc motor considered a single input single output system having torque speed characteristics compatible with most mechanical loads. Speed control of separately excited dc motor with efficiency maximization propensity article pdf available january 2015 with 3,069 reads how we measure reads. A motor requiring dc supply for operation is termed a dc motor. Types of dc motors separately excited motor shunt excited motor series excited motor compound excited motor. Full text of speed conrol of separately excited dc motor. This paper describes speed control of separately excited dc motor using chopper as power converter and pi as speed and current controller.
Separately excited dc motor speed control of using various. Thus the speed can be controlled for under rated speed and speed beyond the rated speed, respectively. Its operation is based on the principle that when a current carrying conductor is placed in a. Speed control of separately excited and shunt dc motors. Speed control of a separately excited dc motor engineering. Dc motor with speed and current closed loops, driven by etpu. The proposed method, is very efficient and could easily be extended for other global.