Solar Powered Variable Speed Power Factor Corrected BLDC Motor drive

Abstract

Renewable energy sources have more importance. This importance is mainly because of limited resource and environmental problems of the conventional energy. Among the all renewable energy resources available, solar energy seems to be a major competitor as it is abundant in nature and also pollution-free. And we can convert this dc from solar panel to single phase AC source by using single phase inverter. This AC source is the supply for BLDC motor drive. And speed control method of BLDC motor with low cost for low power applications can be done by using a power factor corrected bridgeless buck-boost converter. Speed control is by controlling the dc link voltage of the voltage source inverter (VSI). Bridgeless converter reduces the conduction losses in the diode bridge rectifier. Commutation of the BLDC motor is by using VSI, which reduces the switching losses and it avoid the sparking and wear and tear by mechanical commutation and it is known as electronic commutation. Power factor improvement is done by designing the converter in discontinuous inductor current mode (DCM). As compared with other speed controlling method, speed control of BLDC motor by power factor corrected bridge less buck-boost convertor uses reduced number of components. This method has high efficiency and low cost as compared with other speed controlling method of BLDC motor and improved power quality is also achieved.