Design of a Bi-Harmonic 7-Phase PM Machine With Tooth-Concentrated Winding
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TLDR
In this article, a seven-phase surface-mounted permanent magnet (SPM) machine with a lower fundamental winding factor than the third harmonic current component is considered and 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.Abstract:
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.read more
Citations
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Journal ArticleDOI
Advances in Dual-Three-Phase Permanent Magnet Synchronous Machines and Control Techniques
TL;DR: An overview of the recent advances in multiphase permanent magnet synchronous machines (PMSMs) and drive control techniques, with a focus on dual-three-phase PMSMs, is presented in this article.
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A Review of Torque Ripple Reduction Design Methods for Radial Flux PM Motors
TL;DR: In this paper , a comparison of several design techniques to reduce torque ripple by different approaches and categorize them to show the characteristics of each group, is presented, and a discussion is made about the advantages and disadvantages of the designs, in general, as well as some comments about the missing, but important information, in the papers.
Proceedings ArticleDOI
Sensorless controls of a 7-phase bi-harmonic Surface-mounted PM Machine
TL;DR: In this article , the position sensorless control of a seven-phase bi-harmonic surface-mounted PM machine is investigated. And the authors show that the machine can operate without a position sensor.
Journal ArticleDOI
Multi-Phase Fractional-Slot PM Synchronous Machines with Enhanced Open-Circuit Fault-Tolerance: Viable Candidates for Automotive Applications
TL;DR: The present work proposes a design approach that extends the slot-pole combinations to candidates that are characterized by a star of slots including three phasors per phase and per winding period, which has the merit of improving the tolerance against open-circuit faults along with an increase in the winding factor of multi-phase machines.
Journal ArticleDOI
Optimized Torque Performance of a 7-Phase Outer-Rotor Surface-Mounted Permanent Magnet Synchronous Machine for In-Wheel E-Motorcycle Application
TL;DR: In this paper , four outer rotor surface-mounted permanent magnet synchronous machines (SMPSM), supplied by a seven-phase drive system, are proposed, considering different q (number of stator slot per phase per pole ratio) to achieve a satisfying value of electromagnetic torque and Back-Electromotive Force (Back-EMF) with lower torque pulsation.
References
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Influence of design parameters on cogging torque in permanent magnet machines
Zi-Qiang Zhu,D. Howe +1 more
TL;DR: In this article, the influence of various design parameters on the cogging torque developed by permanent magnet machines is investigated, and it is shown that the slot and pole number combination has a significant effect on the Cog torque, and influences the optimal value of both skew angle and magnet arc, as well as determining the optimal number of auxiliary teeth/slots.
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Pulsating torque and losses in multiphase induction machines
Susanna Williamson,S. Smith +1 more
TL;DR: In this paper, the authors take a high level look at multiphase induction machines in order to examine those aspects that are not design-specific, and they show that for a machine in which the only design variable is the phase number, the main target for loss reduction is the stator copper loss, which by the use of more than three phases may be attenuated by as much as 8.5%.