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Author Jiabin Wang ♦ Atallah, K. ♦ Weiya Wang
Sponsorship IEEE Magnetics Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1965
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Force ♦ Fasteners ♦ Magnetic flux ♦ Magnetosphere ♦ Magnetic analysis ♦ Actuators ♦ Saturation magnetization ♦ permanent magnet motors ♦ Linear actuators ♦ linear motors
Abstract This paper describes a high force density linear electromagnetic actuator based on the concept of magnetic screw-nut, in which helically disposed, radially magnetised permanent magnets are placed on both the screw and the nut. Magnetic force and torque can be developed between the two parts without direct mechanical contact. Analytical and numerical analysis has been carried to predict the performance of the magnetic screw-nut assembly. It has been shown that a thrust force density in excess of 10 MN/m<sup>3</sup> can be achieved for airgap lengths varying from 0.4 mm to 0.8 mm and a lead λ greater than 7 mm. When combined with a naturally cooled permanent magnet brushless machine having a torque density of ~15 kNm/m<sup>3</sup>, the resulting thrust force density of the combined system, i.e. electrical machine and magnetic screw-nut assembly, is an order of magnitude higher than that of a liquid-cooled tubular permanent magnet brushless machine.
Description Author affiliation :: Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK
ISSN 00189464
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-10-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 47
Issue Number 10
Size (in Bytes) 929.06 kB
Page Count 4
Starting Page 4477
Ending Page 4480

Source: IEEE Xplore Digital Library