Jun 10, 20 this model simulates direct torque control of a three phase induction motor. Pdf simulink model of direct torque control of induction. Different websites were used as a resource to develop the direct torque control. The discretetime equations for stator fluxes in the frame are. Induction motor modeling the mathematical model for induction motor in the stationary reference was obtained on the basis of. Direct torque control dtc is one of the most excellent control strategies of torque control in induction machine. The sixstep vsi induction motor drive block represents a classical openloop voltshertz control, sixstep or quasisquare wave drive for induction motors. Direct torque control, induction machine, vector control, matlabsimulink. Since this paper is using the ac4 simulink model, only the development of fuzzy logic controller will be discussed. In scalar control, which is based on relationships valid in steady state, only the magnitude and frequency of.
Beginner level, mathematical model of asynchronous motor in matlab simulink. The flux and the current have direct proportion with motor torque. Scalar control is the term used to describe a simpler form of motor control, using nonvectorcontrolled drive schemes. Speed control of a three phase induction motor using field. When the input is a negative signal, the asynchronous machine behaves as a generator. Direct torque control dtc is an emerging technique for controlling pwm inverterfed induction motor im drives. The induction motor block implements a threephase induction motor. The direct torque control is one of the excellent strategies available for torque control of induction machine. The motor is started under different loads in two methods. Space vector trajectory is also plotted to observe the performance. Direct torque control of induction motor drive fed from hybrid multilevel inverter h. Direct torque control of induction motor fed from hybrid. The performance of an induction motor under the classical direct torque control method and improved scheme have.
An843, speed control of 3phase induction motor using. I truly appreciate and value his esteemed guidance and encouragement from the beginning to the end of this report. Phase voltage of 230 volt is given to asynchronous machine. All models and controllers are simulated using matlab and simulink computer program. Using direct torque control of induction motor modelling. Index termsfpga, dspace, direct torque control dtc, induction motor. At the system level, a logic controller balances source and loads on the system bus. Direct torque control, field programmable gate array, fuzzy logic, induction motor, space vector modulation, neural network 1. The scheme does not use a transformation to the rotor flux. The block obtains the stator supply frequency from the speed reference neglecting the slip frequency. The induction machine direct torque control single phase block implements a singlephase induction machine direct torque control structure. Simulation of vector control of induction motor using simulink program vector control of three phase induction motor is simulated by the block diagram and sfunction as shown in figures.
One called the direct or feedback method, and the other, the indirect or feed forward method. To estimate the torque and flux, the induction machine direct torque control block discretizes the machine voltage equations in the stationary reference frame using the backward euler method. The current drops significantly when the motor speed. Direct torque and flux regulation in sensorless control of an. When the input is a positive simulink signal, the asynchronous machine behaves as a motor. This drive features closedloop speed control using hysteresisband torque and flux controllers. The first industrial motors of this type were constructed at the end of the nineteenth century and soon gained the favor of users who appreciated their raggedness, simplicity and relatively low manufacturing cost compared to dc commutator motors. Direct torque control of permanent magnet synchronous motor. The block uses the threephase input voltages to regulate the individual phase currents, allowing control of the motor torque or speed. It allows the precise and quick control of the im flux and torque without calling. Project report on direct torque control of permanent magnet synchronous motor as without his constant motivation and support during my work, this would not have been possible.
Examples are drawn from important techniques including vector control, direct torque control, nonlinear control, predictive control, multiphase drives and multilevel inverters. Direct torque control principle direct torque control dtc is an optimised ac drives control principle where inverter switching directly controls the motor variables. It is considered as an alternative to the field oriented control foc or vector control technique. Direct torque control of permanent magnet synchronous. Optimised direct torque control of induction motor for. Mod01 lec29 introduction to field oriented control of. The overall speed control system was modeled and simulated in matlabsimulink. Pdf direct torque control of induction motor drives. The voltage vector is determined from the dc link voltage and the switching pattern. Matlab simulation for speed control of three phase. The drive finally gets settles at slip speed motor torque balances the load torque. Simulation of direct torque controlled induction motor drive by.
The output of the inverter is connected to the stator terminals of induction motor. Dtc is employed for high performance and quick response drives takahashi and ohmori, 1989. The rotor will constantly be turning to align its magnetic field with that of the stator field. Simulation on simulink ac4 model 200hp dtc induction motor. The voltage is defined from the dcbus voltage and inverter switch positions. Modeling and simulation of direct torque control induction motor drives via constant volthertz technique. Simulink model of three phase induction motor file exchange. Direct torque control, induction machine, vector control, matlab simulink. A new quickresponse and highefficiency control strategy of an induction motor.
A linear model of the system can be extracted from the simulink model into the matlab workspace. Metwally, mahrous ahmed faculty of engineering, electrical engineering, dept, taif university, ksa h. An efficient method of induction motor control is the direct torque control dtc. Simulink model of direct torque control of induction machine core. After the implementation of machine model, a sensorless control of induction motor using direct synthesis from state equations have been carried out by using matlab simulink for the evaluation of dynamic performance of induction motor. The choice of direct torque control from these methods gives advantages such as. Induction machine direct torque control singlephase. Direct torque control, space vector modulation, induction motor. Indicative of dtc performance with induction motors is torque response time to a 100% torque reference step that approaches the motors electrical time constant limit. Simulation on simulink ac4 model 200hp dtc induction. High performance direct torque control of induction motor. It is considered as an alternative to field oriented control technique. The basic idea of an electric motor is to generate two magnetic fields. Using matlab simulink software, here direct torque control of induction motor is implemented and the various fault issues of induction motor is presented with the help of fuzzy based fault.
The whole drive system is simulated in matlabsimulink based on the system devices, bldc motor and inverter. The simulink input of the block is the mechanical torque at the machines shaft. Suresh wrote, for the direct torque control of induction machines,there is an demo available in the matlab directory. Pmsm drive template the pmsm drive design template consists of a motor drive system, with a linear pmsm, with maximumtorqueperampere control and field weakening control. Mod01 lec29 introduction to field oriented control of induction machines. A 6 kw three phase induction motor has been used in order to run and evaluate the developed model. Svpwm based speed control of induction motor with three level. Pdf simulink model of direct torque control of induction machine. The rotor time constant is particularly difficult to measure precisely, and it varies with temperature. Modeling and simulation of direct torque control induction motor. Singlephase induction machine direct torque control.
Dtc was originally developed for ac induction motors because of their popularity in myriad industrial and commercial applications. Improvements in direct torque control of induction motor. In this paper, comparison between the matlabsimulink and ansys maxwell simplorer cosimulation is done for speed control of induction motor im based on the. At present, induction motors are the dominant drives in various industries. Sensorless control of induction motor using simulink by. The dtc has been proposed for induction motor control in 1985 by takahashi 1 and similar idea that the name of direct self. Thus, their control techniques have received a lot of interest. Implement direct torque and flux control dtc induction. Fpgabased design and implementation of direct torque control. Direct torque control technique for voltage source inverter fed induction motor drives. Simulation of 3ph induction motor in matlab with direct. Induction motor drive, modeling of induction motor, vector control, field orient control, direct torque control, and fuzzy applications. Three phase induction motor using direct torque control by matlab. A 6 kw three phase induction motor has been used in order to.
This starting torque is also called locked rotor torque lrt. Singlephase induction motor threephase induction motor singlephase induction motor there are probably more singlephase ac induction motors in use today than the total of all the other types put together. For induction motors, direct torque control dtc 1, 2 and field oriented control foc. Direct torque and flux regulation in sensorless control of. As the speed increases, the current drawn by the motor reduces slightly see figure 2. Induction motor, stator reference frame, direct synthesis. Simulation of direct torque control of induction motor using simulink. Simulation of 3ph induction motor in matlab with direct and. The simulation results under no load as well as full load identified the obvious.
Simulink modeling page we generated two different dc motor models in simulink. Classical dtc induction motor drive classical direct torque control dtc drives 16. Control tutorials for matlab and simulink motor speed. Introduction the induction machine im has been widely used in industries due to its relative. Direct torque control the fieldoriented control is an attractive control method but it has a serious drawback. Fpgabased design and implementation of direct torque. Block diagram of the proposed drive system it relies on the principle that the torque and the magnitude of the stator flux are directly proportional with the ratio between the magnitude of the stator voltage and the stator frequency as given in 1 and 2 2.
Matlab simulation for speed control of three phase induction. The speed control loop outputs the reference electromagnetic torque and stator flux of the machine. A new technique for the torque control of induction motors was developed and presented by i. Alshawi,space vector modulation direct torque speed control of induction motor, thesis, nahrain university, dec. How an induction motor works by equations and physics. By default, the block sets the simulation type parameter to continuous to use a continuous sample time during simulation. Usually on a woundrotor induction motor, the external resistance is optimized for. The 3phase set of currents, each of equal magnitude and with a phase. The proposed dtc is based on fuzzy logic technique switching table and the platform to perform the simulation by using simulink. The induction machine scalar control block implements an induction machine scalar, that is vf or vhz, control structure. The electromagnetic torque of a threephase induction motor can be written as 2, 4. Direct torque control of induction motor using svm matlab. Design and simulation of field oriented control and direct torque control for a permanent magnet synchronous motor with positive saliency anders kronberg the researchers at the department of electricity at uppsala university has recently entered the field of electric motor design, however no real knowledge of motor.
Speed estimator is implemented to control of speed of motor along with the torque. The subsystem controllers consist of feedback control loops encompassing sliding mode, bangbang, and conventional control laws. In this project, a dtc model has been developed and tested using a matlabsimulink package. Communities more files in the power electronics control community. Simulink model of direct torque control of induction machine h. Direct torque control of induction motor machines physics. Design and simulation of field oriented control and direct. Flux and torque estimation the feedback flux and torque are calculated from the machine terminal voltages and currents. Direct torque control design for three phase induction motor ijedr. Direct torque control with threelevel inverter the basic functional blocks used to implement the dtc scheme are represented in figure 1. There are essentially two general methods of vector control. This tutorial shows how to build a simple open loop ac drive controlling an asynchronous machine. High performance direct torque control of induction. Noguchi 1 as a new performant control strategy for induction motor drives fed by voltage source inverters vsi.
Introduction the history of electrical motors goes back as far as 1820, when hans christian oersted discovered the magnetic effect of. The performance of this control method has been demonstrated by simulations performedusing a versatile simulation package, matlabsimulink. It is logical that the least expensive, lowest maintenance type. Equations this diagram shows the direct torque control architecture for singlephase machines. We will now employ these models within simulink to simulate the system response and design different approaches to control. In this paper the direct torque control model is designed and tested through matlab simulink software for torque and speed control of induction motor. High performance control of ac drives with matlabsimulink. With pwm, combined with modern control techniques such as fieldoriented control or direct torque control, you can obtain the same flexibility in speed and torque control as with dc machines. Kavasseri, cristinel ababeiy, department of electrical and computer engineering, north dakota state university, fargo, nd.
T s t 2 3 2 3 sa b sc e i a i b in principle thedtc method selects one of the six nonzero and two zero voltage vectors of the inverter on the basis of the instantaneous errors in torque and stator flux magnitude. Jun 14, 2012 beginner level, mathematical model of asynchronous motor in matlab simulink. Simulink model of direct torque control of induction machine article pdf available in american journal of applied sciences 588 january 2008 with 3,404 reads how we measure reads. Dtc is preferred over other controlling schemes for high dynamic applications, but, on the other hand, shows higher current and torque ripple. Direct torque control of an induction motor file exchange. Feb 22, 2018 direct torque controldtcinduction motor drive matlab simulink you tube. The dtc induction motor drive ac4 block represents an improved scalar control drive for induction motors with direct torque and flux control.
In scalar control, which is based on relationships valid in steady state, only the magnitude and frequency of voltage, current, and flux linkage space vectors are. Direct torque control, permanent magnet synchronous motor, space vector modulation 1 introduction direct torque control was introduced by i. Direct torque control of induction motor has increasingly become the best alternative to fieldoriented control methods. Matlab simulink already has a dtc induction drive model that implements the classical dtc introduced in l. Indirect vector controlled ivc induction motor drives used in high. Induction motor modeling the mathematical model for induction motor in.
These hysteresis controllers maintain the flux and torque within an allowed upper and lower limit. The actual motor speed and torque are calculated from the motor voltage current and frequency using vector quantities of current and voltage. Introduction the demand for high performance electric drives is steadily growing with the increasing emphasis for electri. Direct torque control dtc is one of the most excellent control. Assessment of direct torque control for induction motor drives. Each method is studied and discussed using supporting simulation of currents, torque, speed, efficiency and power factor curves. It is quite cumbersome to control an induction motor im because of its poor dynamic response in comparison to the dc motor drives. Using direct torque control of induction motor modelling and. The measured input values to the dtc control are motor current and voltage. This lowers the maximum torque too, but it substantially increases the starting torque. These two control strategies are different on the operation principle but their objectives are the same. Space vector modulation direct torque speed control of. Modeling and simulation of direct torque control induction.
Compared to field oriented control, dtc has following advantages like a simple and quick response control, b absence of. Speed control of vector controlled induction motors using. The overall speed control system was modeled and simulated in matlab simulink. In this project, a dtc model has been developed and tested using a matlab simulink package. It has been more than a century since the principle of the operation of induction motors was discovered. In many industrial applications, direct torque control dtc of induction motor is wellknown control method which provides fast dynamic response compared with other control methods like field oriented control foc. Over the years direct torque control dtc of induction motor emerged as an alternative to field oriented control of induction motor takahashi and naguchi, 1986. Direct torque control for induction motor using fuzzy logic. A direct torque control algorithm of induction motor drive has been modelled and simulated using matlabsimulink simulation package 8, 9.
Increasing rr lowers the rotor time constant moving the peak torque to lower rotation speed and higher slip. The induction machine direct torque control singlephase block implements a singlephase induction machine direct torque control structure. Vf control, field oriented control, and direct torque control. Design of direct torque controller of induction motor dtc.