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dc.contributor.authorChen, Jiahaoen_US
dc.contributor.authorMei, Jieen_US
dc.contributor.authorYuan, Xinen_US
dc.contributor.authorZuo, Yuefeien_US
dc.contributor.authorLee, Christopher Ho Tinen_US
dc.identifier.citationChen, J., Mei, J., Yuan, X., Zuo, Y. & Lee, C. H. T. (2021). Natural speed observer for nonsalient AC motors. IEEE Transactions On Power Electronics, 37(1), 14-20.
dc.description.abstractThis letter addresses experimental validation of the reduced-order natural speed observer design for position sensorless drive with nonsalient permanent magnet synchronous motor. The natural speed observer and the active flux estimator are connected in a cascaded fashion, which results in a simple sensorless algorithm that needs only to tune one bandwidth parameter for flux estimation and one bandwidth parameter for speed observation. Experimental results of high speed reversal test, zero speed stopping test, and slow speed reversal test are included, where the practice of applying nonzero d-axis current at zero speed has shown to be effective for loaded zero speed stopping test, but it causes zero-speed lockedup at slow speed reversal with acceleration rate of 50 r/min/s. Four remedies are compared to improve the slow speed reversal test and the proposed method gives almost ramp actual speed waveform, nondiverging q-axis current and smooth transition in position waveform during slow zero speed crossing. A new dynamic expression of the active flux is proposed and with the aid of the active flux concept, the proposed sensorless algorithm is also applicable to various types of ac motors.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofIEEE Transactions on Power Electronicsen_US
dc.rights© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works. The published version is available at:
dc.subjectEngineering::Electrical and electronic engineeringen_US
dc.titleNatural speed observer for nonsalient AC motorsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsSensorless Controlen_US
dc.subject.keywordsUnified Modelen_US
dc.description.acknowledgementThis work was supported by National Research Foundation (NRF) Singapore, under its NRF Fellowship under Grant no: NRF-NRFF12-2020-0003.en_US
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