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      Design of flux-weakening space vector control algorithms for permanent magnet brushless DC machines on suitable synchronous reference frames


      , 1 , 2 , 1 , 2 , 1 , 2 , 1

      IET Electrical Systems in Transportation

      The Institution of Engineering and Technology

      permanent magnet machines, PI control, torque, brushless DC motors, machine vector control, voltage control, electric potential, control system synthesis, magnetic flux, numerical analysis, demagnetisation, machine theory, flux-weakening space vector control algorithms, permanent magnet brushless DC machines, torque equations, demagnetising current components, PMBDCM torque demand, DC link, PMBDCM constraint management, torque ripple, synchronous reference frames, PI regulator, SVC design, PMBDCM voltage equation, trapezoidal shapes, back-emf, constant-power speed range, numerical simulation

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          The design of space vector control (SVC) systems suitable for flux-weakening operation of permanent magnet brushless DC machines (PMBDCMs) is presented in this study. The proposed design approach enables overcoming the critical issues arising from the non-linearities of PMBDCM voltage and torque equations; these issues derive from the trapezoidal shapes of back-emfs and affect PMBDCM constraint management significantly. The SVCs presented in this study have been developed within two different synchronous reference frames, both of which enable distinguishing torque and demagnetising current components clearly. Therefore, reference torque current component is determined in accordance with PMBDCM torque demand, while reference demagnetising current component is computed through a voltage follower PI regulator, which processes the voltage deficit detected on the DC-link. In this regard, a novel synchronous reference frame is proposed in this study, which improves PMBDCM constraint management and results into a wider constant-power speed range, but at the cost of some torque ripple. The enhanced performances achievable by SVC approaches are highlighted by numerical simulations, which regard the comparison among the SVCs and an SVC with no flux-weakening capability, at different operating conditions.

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          Most cited references 25

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          Overview of Permanent-Magnet Brushless Drives for Electric and Hybrid Electric Vehicles

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            A Review of the Design Issues and Techniques for Radial-Flux Brushless Surface and Internal Rare-Earth Permanent-Magnet Motors

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              Voltage Feedback Current Control Scheme for Improved Transient Performance of Permanent Magnet Synchronous Machine Drives


                Author and article information

                IET Electrical Systems in Transportation
                IET Electr. Syst. Transp.
                The Institution of Engineering and Technology
                12 September 2019
                4 December 2019
                December 2019
                : 9
                : 4
                : 215-225
                [1 ] Department of Electrical and Electronic Engineering, University of Cagliari , Via Marengo 2, Cagliari, Italy
                [2 ] Novel Electric Propulsion Systems , NEPSY srl, Via Logudoro 8, Cagliari, Italy
                IET-EST.2018.5108 EST.2018.5108.R1

                This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License ( http://creativecommons.org/licenses/by-nc-nd/3.0/)

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                Pages: 0
                Special Issue: Selected Papers from the 2017 and 2018 IEEE Vehicle Power and Propulsion Conference


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