Comparative Study of Brushless DC Motor Drives with Different Configurations of Modular Multilevel Cascaded Converters

Brushless DC (BLDC) motor drive is the most numerous of all types of drives mainly at low and middle power. Such drive is predominant in system with autonomous power supply especially in electric vehicles of different class where onboard DC-bus composes from number of low voltage sources. In this paper, three configurations of power converters were used for integration of different number of supply batteries and simultaneously to control the motor torque and speed. These converters were constructed as modular multilevel cascaded of different topology such as high-boost cascaded with triangular structure and half-bridge multilevel cascaded for adjusting the DC-bus voltage or full-bridge multilevel inverter. Paper describes their schemes and work as well as compares the numbers of main components. Conducted simulation in Matlab/Simulink software for the same BLDC motor showed different dynamics of comparative drive system and allowed to make recommendations concerning their application.