NDLI: Rotor design considerations for a variable-flux flux-intensifying interior permanent magnet machine with improved torque quality and reduced magnetization current

Content Provider	IEEE Xplore Digital Library
Author	Afang Sun Jian Li Ronghai Qu Junhua Chen Hanxiao Lu
Copyright Year	2015
Description	Author affiliation: Sch. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China (Afang Sun; Jian Li; Ronghai Qu; Junhua Chen; Hanxiao Lu)
Abstract	This paper presents design process of the rotor to obtain a variable-flux flux-intensifying interior permanent magnet machine (VFI-IPM) with improved torque quality and reduced magnetization current. The VFI-IPMs have attracted much attention because the magnetization state of the permanent magnets can be adjusted according to load conditions. By applying a d-axis pulse current to magnetize the PMs to a high state at low speeds and decease the magnetization state of the PMs at high speeds, the VFI-IPM can achieve high efficiency at a wide speed range. However, since low coercive-force magnets, such as Alnico, are always used and the remnant flux density is always lower than rare-earth magnets, methods to achieve high torque density should be explored. Moreover, to re-magnetize the PMs completely when the rotor slows down, the magnetization current is usually several times of the rated current. Therefore, it is essential to reduce the magnetization current and thus reduce the inverter rating. In this paper, tangential magnetization orientated Alnico magnet with suitable magnetic energy $(BH_{max})$ and perfect squareness is selected to obtain high torque density. However, torque ripple is serious in tangentially magnetized PM machines, so methods to reduce torque ripple are also proposed in the following study. To further improve the torque density and reduce the magnetization current, four different topologies are built in finite-element (FE) software and then an optimal topology is confirmed by comparing these four models. Based on the optimal topology, prototype has been manufactured.
Starting Page	784
Ending Page	790
File Size	835887
Page Count	7
File Format	PDF
e-ISBN	9781467371513
DOI	10.1109/ECCE.2015.7309769
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-20
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inverter rating Magnetic flux Torque Magnetization Air gaps Variable-flux flux-intensifying interior permanent magnet machine (VFI-IPM) Rotors Magnetization ratio Finite-element (FE) Magnetization current Lamination Magnetic separation Torque density Torque ripple Alnico magnet
Content Type	Text
Resource Type	Article

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