J. Mech. Cont.& Math. Sci., Special Issue, No.-5, January (2020) pp 227-239 Copyright reserved © J. Mech. Cont.& Math. Sci. S. Nithya Lavanya et al 227 LOW COMPUTATIONAL BURDEN AND FIXED SWITCHING FREQUENCY RANDOM PWM TECHNIQUES FOR VECTOR CONTROLLED INDUCTION MOTOR DRIVE S. Nithya Lavanya 1 , T. Bramhananda Reddy 2 , M. Vijay Kumar 3 1 Lecturer in Electrical Engineering Government Polytechnic College Tadipatri, Anantapur, AP. 2 Department of EEE, G.Pulla Reddy Engineering College, Kurnool, AP. 3 Department of EEE, JNTUA, Anantapur, AP 1 snlmvs@gmail.com, 2 tbnr@rediffmail.com Corresponding Author: S. Nithya Lavanya Email: snlmvs@gmail.com https://doi.org/10.26782/jmcms.spl.5/2020.01.00020 Abstract: This paper presents constant sampled random PWM techniques with low computational burden for vector controlled induction motor drives. The classical space vector PWM (SVPWM) method involved with more computational burden due to more calculations. Also, it generates high amplitude harmonics nearer to the multiples of switching frequency of the inverter. Hence, the proposed approach generated the modulating signals of SVPWM method by using a simple scalar technique. Further, to mitigate the harmonic amplitudes, three types of random PWM (RPWM) methods with fixed sampling frequency are proposed for vector controlled induction motor drive. The effectiveness of the proposed PWM methods is confirmed with simulation and experiments on induction motor drive. Keywords: Induction motor, RPWM, SVPWM, Vector control . I. Introduction The rugged and simple construction made the induction motor more popular in various applications, especially adjustable speed drive applications. The vector controlled induction motor gives decoupled and fast transient response and hence, traditional DC motor drives are replaced with induction motor [I-III]. The improvements in vector control and its applications are discussed in detailed in [II-III]. In vector control the ruggedness of induction motor will be decreased due to the speed The Paper Presented at National Conference on Recent Trends & Challenges in Engineering Organized by Rajive Gandhi Memorial College, AP, India JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES ISSN (Online) : 2454 -7190 www.journalimcms.org ISSN (Print) 0973-8975