Average-Value Modeling of Brushless DC Motors With 120 #x00B0; Voltage Source Inverter

TitleAverage-Value Modeling of Brushless DC Motors With 120 #x00B0; Voltage Source Inverter
Publication TypeJournal Article
Year of Publication2008
AuthorsHan, Q., N. Samoylenko, and J. Jatskevich
JournalEnergy Conversion, IEEE Transactions on
Pagination423 -432
Date Publishedjun.
Keywordsaverage-value model, average-value modeling, brushless DC motors, commutation, commutation angle, electrical time constants, hardware measurements, invertors, motor-inverter systems, nonlinear algebraic function, nonlinear equations, permanent magnet machines, permanent magnet synchronous machine, small-signal analysis, stator currents, stators, switching convertors, synchronous machines, voltage source inverter

This paper describes average-value modeling of brushless dc (BLDC) motor-inverter systems, which is challenging due to the complicated switching patterns of the stator currents. A new average-value model (AVM) that appropriately includes commutation and conduction subintervals of the BLDC motor with a 120deg inverter is presented. The proposed model is explicit and uses a proper qd model of the permanent magnet synchronous machine. The required commutation angle is represented as a nonlinear algebraic function, which is readily obtained from the detailed simulation. The studies conducted are based on two typical industrial motors with different electrical time constants, and include hardware measurements, detailed simulation, and comparison with a previously published AVM. The proposed model is shown to be more accurate in terms of both large and small-signal analysis and is applicable to both types of motors.


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