Loss minimizing control strategy for electrical machines considering iron loss distribution

Iron losses have a large share in the overall losses of high power density electrical machines operating as variable speed drives. Therefore, commonly used control strategies such as Maximum Torque per Ampere or Maximum Torque per Voltage aiming at minimizing the copper losses do not select the best direct- and quadrature currents to maximize the efficiency or minimize the overall losses at each operating point. This paper elaborates a loss minimizing control strategy considering the iron loss distribution at all operating points, comparing different iron loss models.