International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-9 Issue-2, December 2019 994 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number: K13450981119/2019©BEIESP DOI: 10.35940/ijitee.K1345.129219 Abstract: A sensor less BLDC (Brushless Direct Current) motor speed control is performed using PSO algorithm. The PSO algorithm manages the gain value of the PID controller. The speed of the BLDC motor is provided as the feedback to the controller. The error value is calculated by predetermined speed for the BLDC motor. Wind power generator is used as the input power source for driving BLDC motor. The output power of the wind power generator varies based on the wind speed. The variable input source for the BLDC motor affects the performance of the motor. In order to regulate the input voltage of the BLDC motor, SEPIC DC-DC converter is used. The PSO-PID controller controls the Gate pulse of the SEPIC converter. The model is developed in MATLAB/Simulink, the performance of the proposed PSO-PID control is measured in variable input power condition. The hardware model is developed using MSP430 microcontroller to test the efficiency of the PSO-PID controller in the real time environment. Keywords : BLDC motor, PSO-PID, SEPIC converter, Wind power Generator, speed control.. I. INTRODUCTION Brushless DC motors (BLDC Motors) are widely used in industrial applications were higher reliability and accurate control is needed. BLDC motor posses a simple structure with maximum speed range. Traditional AC motors are used in the industrial applications, which were replaced by the brushed DC motors. Development in the field of motor technology the BLDC motors are introduced with higher efficiency in handling speed and torque characteristics. In BLDC motors Brush based commutation is replaced with electronic commutation. The torque delivered by the BLDC motor is higher than its size. Thus, the BLDC motors are used in the applications were weight and space plays a critical factor. The applications of BLDC motor was classified as follows open loop Applications, Closed loop Applications, positioning Applications. The examples like blowers, fans and pumps are classified under open loop applications. An elementary low cost controller is enough to control the BLCD motor for the open loop application. The closed loop application requires higher accuracy in speed control and better dynamic response. The house hold application like dryers, washers are the examples of closed loop applications. Revised Manuscript Received on December 05, 2019. Murali Dasari, Department of E.E.E, JNTUA Ananthapuramu, Ananthapuramu, India. Email: muralidvr@gmail.com A Srinivasula Reddy, Department of Electrical Engg, CMR Engineering College, Hyderabad, Telangana. , India. Email: svas_a@rediffmail.com. M.Vijaya Kumar, Department of Electrical Engg, JNTU College of Engineering, Ananthpur, India. Email: mvk_2004@rediffmail.com Even speed control is used in automotive applications like electronic steering, fuel pump control and engine control. These applications need advanced control algorithms. The positioning applications focus on faster response in speed and torque of the motor. Automation and Industrial applications, which use BLDC motors, are grouped in this category. These applications may change the direction of the rotation of BLDC motor more frequently. These applications posses four important phases they are Acceleration phase, Constant speed phase, Deceleration phase, Positioning phase. A complex algorithm is needed to control the BLDC motor connected to the load in all these phases. The control algorithm posses three control loops namely, Position control loop, Torque control loop and Speed control loop. A closed loop controller is required to perform these loop operations. The commutation time of the BLDC motor is reduced by adding a sensor along with the control system. A. BLDC motors vs Traditional DC motors The rotor in the electric motor is referred as commutator. In traditional DC motor brushes are placed to provide contact between DC electrical source and armature coil windings. Brushes provide mechanical contact to the several sections of commutator. The brush system and rotating commutator operates like a switches, which drives the armature coil in the sequence along the permanent magnet or an electromagnet. In BLDC motor the armature coil remains static. Instead of it permanent magnets rotate along the axis. Thus the problem of transferring the power to the armature axis is solved in BLDC motor. The commutator in the traditional DC motor was replaced with the electronic controller in the BLDC motor. The controller is programmed to control switching patterns of the armature coil. Advantages of the BLDC motors are Lesser operational noise, Longer life time, Higher speed ranges, Higher efficiency B. Controlling BLDC motor A Hall effect sensor is used to identify the position of the rotor to measure the speed of the BLDC motor. The main disadvantage of the BLDC motor is its manufacturing cost. Addition of Hall effect sensors increases the manufacturing cost. Some applications like submersible pumps, the BLDC motors are driven sensor less. Various algorithms as Field oriented control, direct back EMF zero crossing and indirect back EMF integration methods are introduced. Adaptive Speed Control Algorithm for BLDC Motor with Variable Input Source using PSO Algorithm Murali Dasari, A Srinivasula Reddy, M Vijaya Kumar