Performance assessment of improved BLDC motor drives and its controls for high torque applications

Abstract

This thesis work presents the Performance assessment of improved BLDC newlinemotor drives and its controls for high torque applications. Primarily, analysis has newlinebeen done of Thermal and Harmonics effect on the torque reaction and heating newlinewhile BLDC drive is in operation. Harmonics components in the load current of a newlineBrushless DC motor has been investigated. Findings of the experimentations have newlinebeen determined that the harmonics elements at the switching frequency and higher newlineorder of switching frequency are reduced using passive filter. It has been newlineestablished that almost half of the harmonics components are diminished with newlinepassive filter. The drive current waveforms are flattened by the filter throughout newlinethe operation and the harmonics components of commutation frequency are also newlinereduced. newlineSecondly, the Active (buck-boost) power factor correction (PFC) technique newlineis realized to the formerly recommended BLDC motor drive in the constant torque newlineregion. The test results proved that the planned PFC of Brushless DC motor drive newlineimproves the power factor from 0.77 to about 0.9997 regardless to the load. newlineThird, an improved input converter circuit for Brushless DC motor drive newlinesystem has been projected. Converter circuit of BLDC drive is planned in such a newlineway to recognize all the power system standards of utility mains. On the basis of newlineinput voltage divider signal, converter stabilizes a constant DC bus voltage to newlineBLDC motor drive. Its inverter designed with sinusoidal PWM output instead of newlinesquare wave PWM; hence there is no pulsation torque. The experimental outcomes newlineare presented to authenticate the stability of the drive system. Several torque and newlineSpeed have been plotted during low voltage (110V) system and high voltage newlinesystems (230V). newlineFourth, development of IoT (Internet of Things) controlled BLDC motor newlinedrive has been explained as there is higher order incremental growth in the newlineapplication of smart devices at consumer levels and industrial grade levels. newline