Design and Implementation of Sensor less BLDC Motor Drive

In this project, a cost-effective position sensor less control for six-switch three-phase BLDC motor drive using a single current sensor is proposed. The six-switch three phase inverter used in six commutation modes based on current control and sensor less control scheme using back EMF method is developed. The four-space-vector scheme was used in the six commutation modes based on current control. The topology of sensor less six-switch three phase inverter is introduced to reduce the mechanical commutation and sensor failure. Sensor less BLDC motors are also simpler and potentially more reliable than units that use Hall-effect sensors, especially if the application is in humid and dirty environment. The motors that rely on measurement of back EMF to determine relative positions of stator and rotor so that the correct coil energizing sequence can be implemented. The feasibility of the proposed sensor less control of six-switch three phase inverter fed brushless DC motor drive is designed and simulated. The results of simulation using MATLAB Simulink is analyzed and presented. Hardware implementation is also done along with PCB design using Proteus Design Suite.