Average-value modeling of brushless DC motors with 120-degree voltage source inverter

Summary form only given. This paper describes average-value modeling of brushless DC motor-inverter systems, which is challenging due to the complicated switching patterns of the stator currents. A new average-value model which appropriately includes commutation and conduction subintervals of the brushless DC motor with a 120-degree 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 average-value model. 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.