Increasing Flux Density Analysis in Sensor-Less Brushless Dc Motor for Artificial Heart Pumping System
Now-a-days the electromechanical energy conversion is playing a vital role to convert mechanical energy into useful work. The development of life saving medical equipment’s with special electrical machines is tremendously increasing such as heart pumping pace maker, inter organ blood replacement devices, dialysis machines etc., Out of which the heart disease is the major problem faced by all the humans. For severe heart issues the best solution is to replace pace maker device for heart pumping system. In this case pace maker is an electro mechanical device that is driven by Sensorless Brushless DC Motor along with the power supply unit. The performance of motor can be improved by controlling the parameters such as flux density, torque, speed and any of the mechanical parameters like air gap length and number of phase windings. In proposed work the flux density of the machine can be increased by increasing the air gap between the stator and rotor. By increasing the air gap the flux density generation at rotor because of excitation can be increased ultimately the efficiency of the motor also increased. The efficiency of the motor is well defined by controlling the back EMF at different phases of BLDC motor. At full load operation the torque can be increased by means of load increasing at motor shaft. But in the proposed technology by increasing the air gap between the stator and rotor the speed of the machine can be maintain at rated speed without losing their efficiency. The entire system performance is analysed by developing a model of Sensor less Brushless DC Motor in MATLAB Simulink environment. The efficiency of BLDC motor can be investigated by various torque and speed operation.