Investigation of Spatial Harmonic Magnetic Field Coupling Effect on Torque Ripple for Multiphase Induction Motor Under Open Fault Condition

Torque Ripple Minimization of a Five-Phase Induction Motor Under Open-Phase Faults Using Symmetrical Components

“…Based on the stator MMF invariance, the conventional strategy minimizes the torque ripple by suppressing the coupling between the fundamental MMF and the third harmonic MMF [26]. As shown in Fig.…”

“…5(b). Similarly, introducing (23), (25) and (26) into the simulation model of S S II, the results of comparison under a 10 N• m load is shown in Fig. 9 and the reference torque is equal to the load torque.…”

“…The MMF-based methods do not depend on the motor model, and the current commands are required to ensure the invariance of the stator MMF [17][18]. With this constraint, there are four different fault tolerant control strategies, e.g., the maximum torque strategy [19][20], the minimum copper loss strategy [21][22], the best flux distribution strategy [23][24], and the minimum torque ripple strategy [17,[25][26]. Specifically, the torque ripple needs to be minimized in the drive train and marine propulsion, because the highmagnitude torque ripple yields serious vibration and acoustic noise which, in turn, affect their lifetime [27][28].…”

“…In the open-phase faults case, the third harmonic MMFs appear which rotate at ±ω/3, and the interaction between the fundamental MMF and third harmonic MMFs leads to the torque ripple [17]. Therefore, the conventional minimum torque ripple strategy makes the fundamental current space vector to move along the circular trajectory in order to eliminate the coupling [26].…”

Six-Phase Space Vector PWM under Stator One-Phase Open-Circuit Fault Condition

“…Although the machine can run continuously, it performs poorly, e.g. the torque pulsation and speed pulsation would increase [11][12][13].…”