PROJECT TITLE:

Armature Design of Low-Voltage FSPMSMs: An Attempt to Enhance the Open-Circuit Fault Tolerance Capabilities

ABSTRACT:

This paper deals with the torque production capabilities of fractional-slot permanent-magnet synchronous machines (FSPMSMs) underneath open-circuit faulty conditions. The developed approach considers a category of FSPMSMs where an armature is inserted in double-layer slots and is arranged by connecting in parallel the coils or suitable mixtures of coils of every part. In light-weight of this, the machine operates at a low-voltage level. Accordingly, its integration inside 42-V-technology-based mostly automotive systems becomes much more realistic. Moreover, the adopted approach ends up in a significant improvement within the fault tolerance capability below an open-circuit faulty operation. Indeed, a failure affecting a coil would discard one branch among the parallel branches of the corresponding phase, rather than affecting the whole phase in FSPMSMs with series-connected coils in the armature. The approach is initiated by an identification allied to a characterization of the slot/pole combinations enabling the parallel affiliation of the FSPMSM section coils or group of coils. Then, this paper considers the chosen three-part and 5-section FSPMSMs. Following an assessment of their healthy operation, the torque values developed by both machines are predicted employing a 2-D finite-component analysis beneath totally different open-circuit faulty eventualities. Then, a simple control strategy based mostly on the readjustment of the reference sinusoidal current initial phases is proposed to recover the torque production capability of each machines under a branch open-circuit fault.


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