Performance Enhancement of Permanent Magnet Brushless DC Motor Using Multilevel Inverter

This report furnishes the brushless DC motor (BLDC) performance when fed by multi level inverter is compared with voltage source inverter (VSI) fed BLDC motor. Total harmonic distortion (THD) of stator currents and back EMF's of BLDC Motor for these two inverter topologies are compared. Over past years for high power and medium voltage control applications multi level inverters are employed. To obtain higher levels of voltage different types of multilevel inverters are used. Among them, Cascaded H-bridge multi level inverters are mostly used due to its advantages over other. Here experimental results of a voltage source inverter fed BLDC motor performance are compared with cascaded H-bridge multilevel inverter driven BLDC motor performance.