Fuzzy logic‐based loss minimisation scheme for brushless DC motor drive system

Brushless DC (BLDC) motors are widely used in various low‐power drive applications owing to their several advantages over conventional motors. This study describes a fuzzy logic‐based improved loss minimisation technique for the BLDC motor drive system. The proposed algorithm uses selective harmonic elimination‐based pulse‐width modulation to optimise both the converter switching losses along with machine core and copper losses based on a speed‐ and load‐dependent fuzzy rule matrix. The optimum switching angles eliminating lower‐order harmonics are calculated offline and stored in microcontroller memory for online application. The suitability of the proposed control is well demonstrated through simulation and experimental results on a practical 350 W BLDC machine.