http://www.iaeme.com/IJEET/index.asp 75 editor@iaeme.com International Journal of Electrical Engineering & Technology (IJEET) Volume 8, Issue 4, July-August 2017, pp. 75–85, Article ID: IJEET_08_04_009 Available online at http://www.iaeme.com/IJEET/issues.asp?JType=IJEET&VType=8&IType=4 ISSN Print: 0976-6545 and ISSN Online: 0976-6553 Journal Impact Factor (2016): 8.1891 (Calculated by GISI) www.jifactor.com © IAEME Publication LEVITATION AND SPEED CONTROL OF BEARINGLESS SWITCHED RELUCTANCE MOTOR USING FUZZY SLIDING MODE CONTROLLER Polamraju.V.S.Sobhan Dept. of EEE, VFSTR University, Guntur, India, G.V. Nagesh Kumar Dept. of EEE, VIIT, Visakhapatnam, India P.V. Ramana Rao Dept. of EEE, Acharya Nagarjuna University, Guntur, India ABSTRACT The bearingless switched reluctance motor (BSRM) is an integrated device of the switched reluctance motor and the magnetic bearings (MBs) with simple structure possessing no mechanical contact and friction. The nonlinear and uncertain nature of BSRM makes the design of controller difficult for steady levitation of rotor and one of the prominent model-free control techniques to tackle such uncertain systems is the sliding mode control (SMC). This paper proposes a control strategy by merging the intelligence of fuzzy logic with SMC, known as fuzzy sliding mode controller (FSMC) to overcome the drawbacks of SMC regarding high control gains and chattering. The proposed controller modifies the signum function of switching control term with fuzzy logic function, to eliminate rotor vibrations (chattering) with assured robust levitation control under load variations and disturbances. The effectiveness of the proposed FSMC is demonstrated through simulation studies using Matlab/Simulink software comparing with the conventional sliding mode controller. Key words: BSRM, Fuzzy Logic, Levitation Control, Rotor vibration, SMC. Cite this Article: Polamraju.V.S.Sobhan, G.V. Nagesh Kumar, P.V. Ramana Rao. Levitation and Speed Control of Bearingless Switched Reluctance Motor using Fuzzy Sliding Mode Controller. International Journal of Electrical Engineering & Technology, 8(4), 2017, pp. 75–85. http://www.iaeme.com/IJEET/issues.asp?JType=IJEET&VType=8&IType=4 1. INTRODUCTION The simple structure, ruggedness, and fault tolerance of a switched reluctance motor (SRM) makes it most suitable for operating as a bearingless motor [1]. The bearingless switched