The Four Switch Three Phase Inverter Method used for Speed Control of Brushless DC Motor

The speed control method of brushless dc motor is especially used in an electrical vehicles , because it having constant torque, higher efficiency, and very smooth speed control. Duration of speed control the current increases (ripple) is reduces due to adding of resistances by using four switch method which is commonly known as four switch three phase inerter. There are three windings used which has phases a, b and c. In BLDC motor phase- a, phase-b supplied but the phase-c which connected in between two capacitor which connected to dc supply having back electromotive force (back emf). Now adding two regulating vectors conducting vector and non conducting vectors which is used AT MEGA 328P Microcontroller which gives faster and continues operation in conduction as well as in non conduction region. In this paper studied about current control scheme is prove effective due to its literature survey.