The most popular type is the 3phase, squirrelcage ac induction motor. A tutorial in ac induction and permanent magnet synchronous. Vector control of induction motors pranjal barman research scholar department of electronics and communication engineering tezpur university 2. The scalar controls are easy to implement though the dynamics are sluggish. A 3phase ac induction motor can be controlled by varying its inputs according to a mathematical model of the rotor flux field in a complex vector space vector. Vectorcontrolled induction motor drives the previous control strategies good steadystate but poor dynamic response oscillation resulted from the air gap flux vector control fieldoriented control is related to the phasor control of the rotor flux. Mod01 lec29 introduction to field oriented control of. Apr 04, 2008 lecture series on power electronics by prof. The most commonly used controller for the speed control of.
This paper presents the speed control scheme of indirect vector controlled induction motor im drive. The explanation of vector control method is beyond the scope of this thesis. Hence only details of scalar methods are discussed here. The vector control strategy is somewhat similar to that of the induction motor vector control. Aug 03, 2016 vector control of ac induction motors 1. One component defines the magnetic flux of the motor, the other the torque. Currently the use of threephase induction machines has been increased tremendously in industrial applications due to several methods available to control the speed and torque of the motor. Lecture 35 vector control of induction motor youtube. Two control approaches of ac drives scalar control. They are available in a wide range of power ratings. In contrast, vector control methods control the frequency, amplitude and phase of the motor drive voltage. Vf speed control of 3 phase induction motor using space. In vector controlled, highperformance drive systems, the instantaneous torque and magnetic field of the motor are regulated, both in the steadystate and under transient operating. The principle of vector control of electrical drives is based on the control of.
This thesis presents the need of speed control in induction motors. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. This paper proposes an alternative methodology for estimating the speed of a three phase induction motor driven by a voltage source inverter, using space vector modulation under the scalar control. The vector control separates the torque component of current and flux channels in the motor through its stator excitation. The motor speed, electromechanical torque, and currents observed during the starting of the induction motor drive are shown in starting the induction motor drive. An induction motor control by space vector pwm technique.
As induction motors need a rotor flux creation in order to operate, the. Learn for free, pay a small fee for exam and get a certificate. However, an intelligent induction motor drive should be capable of identifying motor parameters itself. Nptel, online courses and certification, learn for free. Mod01 lec29 introduction to field oriented control of induction.
Scalar control is the term used to describe a simpler form of motor control, using nonvectorcontrolled drive schemes. With suitable scale, draw vector oa with length corresponding to i0 at an angle. It is the objective of the article to derive and explain induction motor model in relatively simple terms by. These drives are also particularly suited to applications that must operate at very high speeds with a high level of field weakening, for example. Vector control of induction machines suggests a unique approach aimed at reducing parameter sensitivity for vector controls based on a theoretical analysis of this sensitivity. Ac induction motor vector control, driven by etpu on mpc5500. Voltage source inverter type space vector pulse width modulation svpwm is used for pwm. Vector control algorithm based on different current. In this study parameter estimation algorithms are implemented and motor parameters are calculated. The vector control method uses the dynamic mathematical model of induction motor and allows independent control of flux and torque which makes the induction motor deliver excellent dynamic.
Vector control of pm synchronous motor drive system using. The principle of vector control of electrical drives is based on the control of both the magnitude and the phase of each phase current and voltage. High performance sensorless vector control of induction motor. Matlab simulation of induction motor drive using vf control method mitul vekaria1 darshan thakar2 hitesh prajapati3 1,2,3assistant professor 1,2,3department of computer engineering 1,2,3silver oak college of engineering and technology, ahmedabad abstractthere are several types of method available to control induction motor in industries. Scalar control of induction motor principle of vector control and field orientation sensorless control and flux observers direct torque and flux control of induction motor mutilevel converterfed induction motor drive utility friendly induction motor drive 02 03 03 02 01 01 4 control of synchronous motor self controlled synchronous motor vector. Vector controlled induction motor drives the previous control strategies good steadystate but poor dynamic response oscillation resulted from the air gap flux vector control fieldoriented control is related to the phasor control of the rotor flux. The different methods of speed control of induction motor can be broadly classified in to scalar and vector control methods. Note that you can save the final system state vector and use it as the initial state in a subsequent simulation so that the simulation can start under steadystate conditions. You should also make a dc measurement of stator winding linetoline resistance using a dmm. The advent of vector control techniques has solved induction motor control problems. Pdf speed control of induction motor using pi and vf. Nptel provides elearning through online web and video courses various streams. Gopakumar, centre for electronics design and technology, iisc bangalore.
Torque control of dc motors contd this dc motorlike performance is only possible if iqs only controls iqs and does not affect the flux, i. In contrast, vector control schemes, based on the field orientation principle. Krishna vasudevan,department of electrical engineering,iit madras. It has susceptibility to speed control by regulating rotor resistance. The objective of foc is to achieve a similar type of controller with. Speed control of synchronous motor pdf dc motor drive since ac motors were not capable of smoothly varying speed. The key to vector control is to generate a 3phase voltage as a phasor to.
This book is an early treatment of ac induction and permanent magnet synchronous motors with emphasis on vector control using digital signal processors. It has been found that the dynamic model equations developed on a rotating reference frame is easier to describe the characteristics of induction motors. Record all nameplate information for the induction motor. Induction motor drives, their control and applications in evhevs. Mar 18, 2015 the application has the following specifications.
It privides independent control of flux and troque,and the control characteristic is linearized. Induction motor drive, sensorless vector control, indirect vector control, mras, dsp controller 1. Synchronous motor drives, 3 volts per hertz and vector controlled induction. Starting of 3 phase induction motors, high starting torque motors, speed. An908 using the dspic30f for vector control of an acim. Langsdorf, theory of alternating current machinery second.
The previous control strategies good steadystate but poor. Operating principles of vector control generally,a vector controlled induction motor drive can operate as a separtly excited dc motor drive. Vector control, also called fieldoriented control foc, is a variablefrequency drive vfd control method in which the stator currents of a threephase ac electric motor are identified as two orthogonal components that can be visualized with a vector. Ac induction motor speedtorque characteristic squirrelcage ac induction motors are popular for their simple construction, low cost per horsepower and low maintenance they contain no brushes, as do dc motors. Matlab simulation of induction motor drive using vf control. Induction motor drives with closedloop control are used in similar applications to d. Vector control methods i based on the dynamic motor model i rotor. Ac induction motor vector control, driven by etpu on mpc5500, rev. The pmsm control is equivalent to that of the dc motor by a decoupling control known as field oriented control or vector control. Vector control of an induction motor based on a dsp. Vector control technique used for acim control speed control loop of the acim runs on 3phase ac induction motor control development platform at a variable line voltage of 400420v the control technique incorporates.
Speed control of induction motor using vector control. Scalar control is the term used to describe a simpler form of ac motor control. Abstract control of induction motor im is well known to be difficult owing to the fact the mathematical models of im are highly nonlinear and time variant. Speed control of vector controlled induction motors using. A tutorial in ac induction and permanent magnet synchronous motors, vector control with digital signal processors, fred flett, analog devices, 1994. Vector control traditional control methods, such as the voltshertz control method described above, control the frequency and amplitude of the motor drive voltage. In the vector control scheme, a complex current is synthesized from two quadrature components, one of which is responsible for the flux level in the motor, and another which. This analysis naturally leads to the introduction of control strategies that are based on the combination of different controls with different robustness properties. Ac motor drives are further classified based on external dc current.
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