Natee Limsuwan

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This paper proposes a new rotor design for flux-intensifying interior permanent magnet synchronous machine (FI-IPM SM) that is more suitable for self-sensing control at zero/very low speed based on saliency-tracking methods and retains acceptable power conversion capability as compared to a traditional flux-weakening IPM SM (FW-IPM SM). Design steps for the(More)
This paper presents a novel variable magnetomotive force flux-intensifying interior permanent-magnet (IPM) (VFI-IPM) machine, which uses only low-coercive force magnets to reduce usage of rare earth metals. The VFI-IPM machine is designed with a characteristic of L<sub>d</sub> &gt; L<sub>q</sub>, which is typical for FI-IPM machines and uses low-coercive(More)
This paper presents a design approach for interior permanent-magnet (IPM) machines with variable-flux characteristics using low-coercive-force magnets for improved efficiency and extended operating speed range. A flux-intensifying IPM type with is used in the design due to positive Id operation and reduced loaded Iq effects. Design considerations of machine(More)
In this paper, experimental evaluations for the efficiency of a novel interior permanent-magnet (IPM) machine with variable-flux characteristics using low-coercive-force magnets are presented. The variable-flux characteristics allow improving the efficiency of a machine. A flux-intensifying IPM type having positive saliency is employed for a positive d-axis(More)
This paper investigates the impact of high-frequency-injection-based self-sensing on secondary resistive losses associated with the high-frequency carrier component in interior permanent magnet (IPM) machines. Two types of salient machines, a flux-weakening IPM (L<sub>q</sub> &gt; L<sub>d</sub>) and a flux-intensifying IPM (FI-IPM, L<sub>q</sub> &lt;;(More)
This paper focuses on dynamic control, under loaded conditions, of the magnetization state of suitably designed variable-flux (VF) permanent-magnet (PM) machines. Such VF-PM machines have been shown to achieve low loss operation over a wide range of load and speed. For this type of machine, the PM flux linkage varies during the magnetization manipulation(More)
This paper analyzes the effects of fractional pitch and distributed winding stators on the self-sensing performance of permanent-magnet machines. Three rotor configurations (i.e., a flux-weakened interior permanent-magnet synchronous machine (IPMSM) and two flux-intensified IPMSMs) and two stator designs (i.e., distributed and concentrated windings) are(More)
This paper presents the concurrent design of interior permanent magnet (IPM) machines for self-sensing and power conversion. Simulations with finite-element analysis are mainly used to gain insight of magnetic behavior and flux characteristics in the evaluated machines. <i>q</i>-axis flux barriers are used in the concurrent rotor design due to their(More)
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