--The relationship between the two-individual current control and the vector space decomposition (VSD) control for a dual three-phase permanent magnet synchronous machine (PMSM) is investigated in this paper. It is found that the VSD control is more flexible on controlling the fundamental current in sub-plane and the fifth, seventh current harmonics in z 1 z 2 sub-plane with different PI gains, while the two-individual current control is comparable to the VSD control in having the same PI gains in the and z 1 z 2 subplanes. It is also found that the two-individual current control may have potential instability issues due to the mutual coupling between the two sets of three-phase windings. If the mutual coupling between the two sets is weak to some extent, then the two-individual current control could have the same dynamic performance as the VSD control without the stability issues. Experiments are conducted on a prototype dual three-phase PMSM to validate the theoretical analysis.Index Terms--double d-q synchronous frame current control, double-star motor, dual three-phase, instability, two-individual current control, VSD control.
© 2017. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy.eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Abstract --A method for enhancing torque capability of a dual 3-phase permanent magnet synchronous machine (PMSM) based on conventional dual 3-phase drive system by injecting the fifth and seventh current harmonics without any hardware re-configuration is proposed in this paper. Compared with the third current harmonic injection which is commonly used to enhance torque capability of dual three-phase machine, the two isolated neutral points of each set of single 3-phase windings do not need to be re-connected to the middle point of dc-link capacitors or an additional power switching bridge to provide flowing path for zerosequence current. Further, no additional current sensors are required to obtain the feedback of zero-sequence current to regulate it effectively. For a prototype dual 3-phase PMSM, the average torque increases approximately by 9% at the cost of 0.56% increase in the 12th harmonic torque ripple. The effectiveness of the torque capability enhancement is confirmed by experiments.
--The relationship between the two-individual current control and the vector space decomposition (VSD) control for a dual three-phase permanent magnet synchronous machine (PMSM) is investigated in this paper. It is found that the VSD control is more flexible on controlling the fundamental current in sub-plane and the fifth, seventh current harmonics in z 1 z 2 sub-plane with different PI gains, while the two-individual current control is comparable to the VSD control in having the same PI gains in the and z 1 z 2 subplanes. It is also found that the two-individual current control may have potential instability issues due to the mutual coupling between the two sets of three-phase windings. If the mutual coupling between the two sets is weak to some extent, then the two-individual current control could have the same dynamic performance as the VSD control without the stability issues. Experiments are conducted on a prototype dual three-phase PMSM to validate the theoretical analysis.Index Terms--double d-q synchronous frame current control, double-star motor, dual three-phase, instability, two-individual current control, VSD control.
Αβστραχτ -Ιν τηισ παπερ, τηε ζερο σεθυενχε χιρχυλατινγ χυρρεντ ιν οπεν ωινδινγ (ΟW) περmανεντ mαγνετ σψνχηρονουσ mαχηινε (ΟW−ΠΜΣΜ) δριϖεσ ωιτη χοmmον DΧ βυσ ισ σψστεmατιχαλλψ αναλψσεδ φορ τηε φιρστ τιmε. Ιτ ισ ρεϖεαλεδ τηατ τηε ζερο σεθυενχε χιρχυλατινγ χυρρεντ ισ αφφεχτεδ βψ ζερο σεθυενχε βαχκ ελεχτροmοτιϖε φορχε (ΕΜΦ), χροσσ χουπλινγ ϖολταγεσ ιν ζερο σεθυενχε, φροm τηε mαχηινε σιδε, πυλσε ωιδτη mοδυλατιον (ΠWΜ) ινδυχεδ ζερο σεθυενχε ϖολταγε ανδ ινϖερτερ νονλινεαριτψ, φροm τηε ινϖερτερ σιδε. Παρτιχυλαρλψ, τηε ινφλυενχεσ φροm τηε χροσσ χουπλινγ ϖολταγεσ ιν ζερο σεθυενχε ανδ παρασιτιχ εφφεχτ οφ ινϖερτερ νονλινεαριτψ αρε ινϖεστιγατεδ φορ τηε φιρστ τιmε ιν τηισ παπερ. Τηεν τηε σψντηετιχ mοδελ οφ τηε εθυιϖαλεντ ζερο σεθυενχε χιρχυιτ ισ προποσεδ ασ ωελλ. Εαχη χαυσε ισ στυδιεδ ινδεπενδεντλψ ϖια αναλψτιχαλ mοδελλινγ, φινιτε ελεmεντ αναλψσισ ανδ εξπεριmεντσ. Μεανωηιλε, το ταχκλε τηισ ισσυε, τηε ρελεϖαντ συππρεσσιον στρατεγψ υσινγ φρεθυενχψ αδαπτιϖε προπορτιοναλ ρεσοναντ χοντρολλερ ισ πρεσεντεδ ανδ τεστεδ ον τηε 3κW ΟW−ΠΜΣΜ πλατφορm.Κεψωορδσ-Χιρχυλατινγ χυρρεντ, ινϖερτερ νονλινεαριτψ, οπεν ωινδινγ, ΠΜΣΜ, ζερο σεθυενχε.
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