Comparison Between Direct and Indirect Field Oriented Control of Induction Motor

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2017 by IJETT Journal
Volume-43 Number-6
Year of Publication : 2017
Authors : Venu Gopal B T
DOI :  10.14445/22315381/IJETT-V43P260


Venu Gopal B T " Comparison Between Direct and Indirect Field Oriented Control of Induction Motor ", International Journal of Engineering Trends and Technology (IJETT), V43(6),364-369 January 2017. ISSN:2231-5381. published by seventh sense research group

Vector control, also called field-oriented control (FOC), is a Variable frequency Drive (VFD) control method in which the stator currents of a 3 phase induction motor are identified as two orthogonal components that can be visualized with a vector. The vector control of induction motors is one of the most suitable and popular speed control technique presently used. The vector control technique decouples the two components of stator current space vector: one providing the control of flux and the other providing the control of torque. The two components are defined in the synchronously rotating reference frame. With the help of this control technique the induction motor can replace a separately excited dc motor. The scalar control technique is simple to implement but have the coupling effect ultimately responsible for the sluggish response, which leads to instability due to higher order system effect. The DC motor needs time to time maintenance of commutator, brushes and brush holders. The main effort is to replace DC motor by an induction motor and merge the advantages of both the motors together into variable speed brushless motor drive and eliminate the associated problems. The squirrel cage induction motor being simple, rugged, and cheap and requiring less maintenance, has been widely used motor for fixed speed application. The induction motor is transformed from a non-linear to linear control plant. It is expected that with increasing computational power of the DSP controllers, it will eventually nearly universally displace scalar volts -per-Hertz (V/f) control. In this paper we will come to know the concept of vector control and different types of vector control techniques available. And finally we will be able to compare them.


1. Domenico Casade, Francesco Profum, Giovanni Serra, Angelo Tani, “FOC and DTC: Two Viable Schemes for Induction Motors Torque Control”, IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 17, NO. 5, SEPTEMBER 2002.
2. Mircea Popescu, “INDUCTION MOTOR MODELLING FOR VECTOR CONTROL PURPOSE”, Helsinki University of Technology, Laboratory of Electromechanics Report, Espoo 2000, 144 p.
3. Rakesh Singh Lodhi1, Payal Thaku, “Performance & Comparison Analysis of Indirect Vector Control of Three Phase Induction Motor”, International Journal of Emerging Technology and Advanced Engineering Volume 3, Issue 10, October 2013.
4. Ashish Chourasia, Vishal Srivastava,Abhishek Choudhary and Sakshi Praliya, “Comparison study of Vector Control of Induction Motor Using Rotor Flux Estimation by Two Different Method”, International Journal of Electronic and Electrical Engineering, Volume 7, Number 3 (2014), pp. 201-206.
5. Muhammad H. Rashid, “Power Electronics, Circuits, Devices and Applications”, Third edition 2011.
6. B.SrinuNaik,“ComparisonofDirectandIndirectVector Control of Induction Motor”, International Journal of New Technologies in Science and Engineering Vol. 1, Issue. 1, Jan. 2014,
7. Bimal K Bose, “ Modern Power Electronics and AC Drives”, 2002, 8.

Induction Motor, Vector Control, Scalar Control, Sluggish, Higher Order System Effect, DSP.