Dynamic modeling of losses in electrical machines for active loss control

Abstract

This paper presents a dynamic core loss model for active loss control of permanent magnet synchronous machines. Deadbeat-direct torque and flux control (DB−DTFC) enables direct control of torque and stator flux linkage over each switching period. Total machine loss can be minimized by selecting the optimal flux level in every sampled time instant. Reliable models for dynamic copper and core loss are an essential requirement for this optimizing task. This paper presents an analytical dynamic core loss model in switching period time-domain, using stator flux linkage as the manipulated input variable. Combining numerical and analytical calculation methods is used to create an easy and practical approach to estimate core loss components based on stator flux linkage without running FEA calculations for every time instant. Additional effects like high frequency eddy current loss in electrically conducting permanent magnets as well as spatial harmonic content are taken into account.

The Efficiency Optimization of Permanent Magnet Synchronous Machine DTC for Electric Vehicles Applications Based on Loss Model

“…The loss of motors includes iron loss, copper loss, stray loss and mechanical loss [10]. The mechanical loss can't be controlled as it is not directly related to current, torque and flux values.…”

Performance analysis of transformer operated by Sinusoidal pulse width modulation Inverter

“…5) represents the eddy current losses under pure sine input and eqa (6) represents eddy current losses of a transformer fed by PWM input.…”