Power Loss Breakdown in BLDC Drives Applications Using MATLAB

A new method is proposed to calculate the power loss breakdown in BLDC motor drive applications. This method is based on actual measurements and can be used for different control methods such as block commutation and FOC. MATLAB derives the MOSFET channel and body diode currents from the phase current and calculates all the losses related to the 3 phase inverter power board, including conduction, switching and body diode losses for the power MOSFETs. The results show that body diode losses are significant in trapezoidal control method and using Schottkylike MOSFETs is preferable. Power measurements verify the calculations.