Abstract
The paper is aimed at a class of fractional-slot permanent magnet- synchronous machines (FSPMSMs) equipped with phases made up of one coil parallel branches, with emphasis on their potential to reject the circulating harmonic currents. Following the identification and topological characterization of this class of machines treated in Part 1, the star of slots approach is extended to the investigation of their back-EMF harmonic content, and the possible resulting circulating harmonic currents. It is found that all identified candidates exhibit the potential to reject the circulating harmonic currents. A case study dedicated to a candidate equipped with three phases made up of six parallel branches of one coil each, is treated. Following an analysis of its back-EMF harmonic content, the torque-speed characteristic is analytically-predicted and validated by 2D finite element analysis and by experiments. The study is achieved by a special attention paid to the iron loss and thermal analysis.
Highlights
I N recent years, there is an increasing attention to develop fault-tolerant electric drives especially in transportation applications
The paper is aimed at a class of fractional-slot permanent magnet synchronous machines (FSPMSMs) equipped with phases made up of one coil parallel branches, with emphasis on their potential to reject the circulating harmonic currents
CASE STUDY This study resumes the candidate treated in Part 1 [11]. It consists in a FSPMSM equipped with three phases in the armature arranged in eighteen double-layer slots and twelve poles in the rotor achieved by interior PMs
Summary
I N recent years, there is an increasing attention to develop fault-tolerant electric drives especially in transportation applications. Multiphase machines equipped with phases made up of seriesconnected coils require non conventional inverters with a relatively high DC-bus voltage for their power supply This results in bulky battery packs in the case of electric and hybrid propulsion systems. A significant improvement in the fault-tolerance capability is gained, such that under an opencircuit fault, the machine would lose the torque produced by the faulty branch, rather than the one developed by a total phase in series-connected coils machines Thanks to their reduced DC bus voltage, EVs and HEVs would have the merit to definitely discard the risk of electrocution of their passengers in case of accidents.
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