Design of a Bi-Harmonic 7-Phase PM Machine With Tooth-Concentrated Winding

If multi-phase machines equipped with tooth-concentrated winding with half a slot per pole and per phase offer interesting characteristics (simplified manufacturing, no space subharmonic, fault-tolerant ability), their low fundamental winding factors make their designs and controls challenging. The...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2020-09, Vol.35 (3), p.1567-1576
Main Authors: Scuiller, Franck, Becker, Florent, Zahr, Hussein, Semail, Eric
Format: Article
Language:English
Subjects:
Electric power
Electromagnetism
Engineering Sciences
Fault tolerance
Fault tolerant systems
Fractional-slot winding
Harmonic analysis
Multi-phase machine
Permanent magnets
Surface-mounted Per-manent Magnet
Teeth
Torque
Torque measurement
Torque ripple
Virtual machining
Winding
Windings
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Summary:If multi-phase machines equipped with tooth-concentrated winding with half a slot per pole and per phase offer interesting characteristics (simplified manufacturing, no space subharmonic, fault-tolerant ability), their low fundamental winding factors make their designs and controls challenging. The paper addresses the case of a seven-phase Surface-mounted Permanent Magnet (SPM) machine which has a fundamental winding factor lower than the third. This so-called bi-harmonic specificity is considered in order to achieve good torque quality (average value and ripples). Regarding the design, the magnet layer is segmented into two identical radially magnetized tiles that cover about three-quarters the pole arc. Regarding the control, the rated Maximum Torque Per Ampere (MTPA) supply strategy (h1h3 control) aims at generating a third harmonic current component greater than the fundamental. A prototype has been manufactured: the ability of the machine to provide smooth torque is experimentally confirmed through the implementation of a simple MTPA control which copes with high distortion in no-load voltage.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2020.2982041