IPM synchronous machine drive response to a single-phase open circuit fault

Abstract

Abstract-This paper investigates the steady-state and dynamic response of an interior permanent magnet (IPM) synchronous machine drive to a single-phase open-circuit fault. This fault results in rotational electromagnetic asymmetry on both the stator and rotor, making it difficult to analyze using classical -transformation techniques. This paper presents a new synchronous-frame machine model that is capable of handling this highly asymmetrical fault condition, including the effects of axis magnetic saturation. Fault responses with two alternative post-fault control strategies are investigated 1) opening all of the inverter switches so that the machine behaves as an uncontrolled generator (UCG), with the two unfaulted phases connected to the inverter dc link via the antiparallel diodes; 2) shorting the two remaining unfaulted phases together using the inverter switches. Results of this investigation show that the fault response is generally more benign using the UCG control strategy, with significantly lower phase currents and pulsating torque than corresponding values delivered using the phase-shorting strategy.Index Terms-Inverter shutdown, IPM synchronous machine, open circuit fault, protection, variable speed drive.

Modélisation causale pour la commande auto-adaptée de machines alternatives triphasées en mode dégradé

“…En cas de dégradation, la phase détériorée doit être isolée pour éviter la propagation du défaut aux autres phases. Par conséquent, quelque soit la dégradation, la phase perturbée est caractérisée par l'annulation du courant correspondant (Welchko et al, 2002 ;Martin et al, 2007). La correction de la dégradation tient compte du nombre de phases dont dispose la machine.…”

“…Un régime de « générateur non contrôlé » (UnControlled Generator ou UCG) s'installe (Welchko et al, 2002). Le choix d'une modélisation en causalité intégrale qui favoriserait la déduction de la commande ne peut être respecté ici puisque la tension v m-k s'exprime à partir de la dérivée des courants dans les phases saines.…”

Stability of an Electric Vehicle with Permanent-Magnet In-Wheel Motors during Electrical Faults

“…Remark: If a gate drive, controlling the gate pulses of one specific phase leg of the inverter fails, results in [11] show that the preferred fault-handling strategy is to remove the gate pulses from all inverter switches, which effectively results in the case described above.…”

“…However, faults, arising either in the PMSM or its corresponding inverter, can be very critical due to the permanent magnetization from the rotor magnets, which cannot be removed. Therefore, a considerable research effort has been put into studying the behavior of PMSMs during various types of faults; examples include [6] [11].…”

Fault classification method for the driving safety of electrified vehicles

“…Due to the constant excitation provided from the permanent magnets in the rotor, the fault characteristics of permanent magnet motors differ from those of conventional induction motors. [15][16][17] A fault analysis was conducted in [18] to specify the severity of different faults in the electric driveline of an EV. Based on the results in [17][18][19][20][21], the following severe fault conditions were analysed, as these result in high changes in the torque characteristics: a three-phase balanced short circuit, an inverter shutdown, a single-transistor turn-on failure, 2 a current sensor misalignment and a controller fault.…”