New Approach to a Hybrid Fuzzy-Sliding Mode Control to a Brushless AC Motor Scheme Abstract— This paper deals with fuzzy-sliding mode control strategies of a Brushless AC Motor. The system combines the performance of fuzzy logic control and sliding mode control. Sliding mode control scheme, fuzzy logic controller strategies and the hybrid fuzzy-sliding mode controller were simulated with Matlab/ Simulink for comparison. Behind this strategy, the main objective is to improve the performance of the fuzzy- sliding mode control scheme. An experimentation, where all the command were implemented to an MSK23335 Board with a PM50 module and a 90W BLAC Motor is used to validate all the result. Keywords—Brushless Motor, Sliding Mode, Fuzzy Logic, Hybrid controller I. INTRODUCTION Because of its high performance in front of electromagnetic disturbances, noises and its suitability, Brushless AC motors are used for any safety critical applications [1] such as defense, industries, robotics, etc. It belong to the family of the Permanent Magnet Synchronous Motors. The absence of commutator and brushes help the users to choose more length of the motor for all the applications needed. The advantages of this motors are: better speed versus torque characteristics, high dynamic response, high efficiency and reliability, long operating life, noiseless operation, higher speed ranges, and reduction of electromagnetic interference (EMI) [2]. His main characteristics is that it is an electrical motor which does not require an electrical connection between stationary and rotating parts, and is categorized based on PMs mounting and the back-EMF shape. Mathematical modelling gives more comprehension of the system before controlling it. More control strategies are developed but an intelligent controller can provide high accuracy when mathematical model is more complicated [3]. Here, a vector control is proposed, at the first time, to show the effectiveness of the Brushless AC command and control. This strategy is more popular in industrial applications [4]. One type of such controllers is the Sliding Mode Controller which [5] and [6] gives more details about all the possibilities for all applications. But, here, simple Sliding Mode Controller is adopted. Nowadays, fuzzy logic controller strategy was developed and presents more control performance. In this control strategy, some constant parameters are needed to be defined and determined carefully [7], [8]. So, in this paper, an attempt is made to develop a methodology using a Sliding Mode Controller combined with a Fuzzy Logic Controller applied to control a Brushless AC Motor drive. This hybrid controller is developed [9], [10]. After the introduction about the paper, the structure of the proposed system is given. The Brushless AC modeling is shown before applying all the controller. These controllers are: vector control, SMC and FLC. An approach of the hybrid fuzzy-siding mode controller is developed in the next section. The SMC strategy is applied to the BLAC motor for more comprehension of the system. The next one deals with the simulation and experimentation of the proposed methodology through respectively the Matlab and Simulink environment and an MSK development kit [11]. Results and discussions gives more details of the objectives of this study. This report is closed by conclusions. II. PROPOSED SYSTEM The system, showed by figure Fig. 1, is composed of a DC Sources or an AC/DC converter, the three phase PWM Inverter, the controller and the Brushless Motor. Fig. 1. General scheme of the proposed system Closed loop control of the brushless motor is used to minimize the presence of parameter variation and load disturbance [3]. III. MODELLING OF THE BRUSHLESS AC MOTOR A. Electrical equations A brushless motor [1], [2] can be modeled as,       a a aa a a b b bb b b c c cc c c di V Ri L M e dt di V Ri L M e dt di V Ri L M e dt                      (1) F. Philibert Andriniriniaimalaza Information and Communications Sciences and Technologies Department Higher Polytechnic School Antsiranana, Madagascar N. Jean Razafinjaka Electrical Engineering Department Higher Polytechnic School Antsiranana, Madagascar B. Charles Andrianirina Electronic and IT Department Science and Technology’s Higher Institute Mahajanga, Madagascar International Journal of Engineering Research & Technology (IJERT) ISSN: 2278-0181 http://www.ijert.org IJERTV7IS120037 (This work is licensed under a Creative Commons Attribution 4.0 International License.) Published by : www.ijert.org Vol. 7 Issue 12, December-2018 83