Control Strategies for Open-End Winding Drives Operating in the Flux-Weakening Region

Abstract

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Advances in Converter Control and Innovative Exploitation of Additional Degrees of Freedom for Multiphase Machines

“…The same system is further studied in [108,109] with the emphasis placed on the propulsion mode. Although the machine is three-phase in motoring, three rather than two current controllers are required due to the use of the Hbridge for each phase, which means that zero-sequence current flow is possible.…”

Integrated Traction/Charge/Air Compression Supply Using Three-Phase Split-Windings Motor for Electric Vehicles

“…According to Levi [7], the most developed integrated motor drive / battery charger is based on the concept of [11]- [13] with associated optimized controls using numerous degrees of freedom of the structure [14]- [15]. [11] and [12] are the first patents of this concept to present the invention of the automotive supplier Valeo, which describes an integrated 3-phase split-winding electrical machine and on-board battery charger system without static relays.…”

“…No motor reconfiguration and no supplementary static relays are necessary. It may be noted that the traction mode has already been studied in the flux-weakening region [15] and in degraded mode [16]. A space-vector pulse width modulation (SVPWM) of the 6-leg inverter has furthermore been proposed in [17].…”

IGBT-SiC dual fed open end winding PMSM drive

“…For these reasons generally the leakage inductance is kept low (common values are around the 5% of the phase inductance). Therefore the value of the zero-sequence inductance depends on the machine parameters and is significantly smaller than the phase inductance [10,12,13]. In the particular case of high speed or high power machines, the value of the zero-sequence inductance is very small due to a small phase inductance.…”

“…While on one hand the common dc bus configuration significantly simplifies and reduces the costs of the topology, on the other hand it allows the ZSC to flow freely in the system [9]. The circulation of additional current increases the losses and reduces the system efficiency, but the level of ZSC developed depends on the zero-sequence inductance magnitude [10]. The zero-sequence inductance coincides with the leakage inductance of the machine which is generally kept low (4-7% of the phase inductance) since it does not increase the average torque produced.…”