DefinePK

Abstract

Brush-less DC (BLDC) motor, now-a-days has become a predominant choice in usage of electrical motors in many applications due to its simple construction and high speed capable operations. This paper presents a photo-voltaic fed high voltage gain closed-loop DC-DC converter for BLDC motor drive application and BLDC motor drive is controlled using a simplified control strategy. Low voltage DC output from photo-voltaic (PV) system is stepped-up to desired value using a high-gain closed-loop DC-DC converter. The configuration of high-gain DC-DC converter with its closed-loop operation is depicted. The output of DC-DC converter is fed to BLDC motor through a converter for BLDC motor drive. Speed control of BLDC motor is achieved using a simplified speed control method in this paper and speed control is achieved without actually sensing the actual motor speed. This type of motor drive is very much suitable for air-conditioner applications. Simulation analysis for the proposed system is carried out for variable incremental/decremented speed with fixed torque and for variable torque with fixed speed conditions. The proposed simplified control strategy for speed control of BLDC motor drive in this paper is found very much suitable for fixed torque with variable speed conditions but found not very much suitable for variable torque and fixed speed conditions through simulation analysis. Proposed system was developed and results are analyzed using MATLAB/SIMULINK software.