Abstract
This paper deals with the analysis and suppression of detent effect in the magnetic lead screw (MLS), which is equipped with parallel magnetized permanent magnet (PM) segments to approximate the helical PM for manufacturing simplicity. The detent effect is caused by the non-uniform magnetization along the helical PM, and behaves as both thrust force ripple and torque ripple during the transmission process. In this paper, a three-dimensional (3-D) analytical model of the MLS is established to analyze and predict the air-gap magnetic field, and the thrust force and torque are then derived, as well as their ripple components. It demonstrates that the harmonic order of the ripples is solely dependent on PM segments' quantities per helix turn on both the nut and screw. The analytical analysis is verified by extensive 3-D numerical computations. The impact of load angel and quantities of PM segments on the detent effect are investigated. It's shown that the torque ripple suffers more seriously than thrust force ripple, and both ripple percentages drop with the increase of load angle. And it is highlighted that larger least common multiple of PM segments' quantities on screw and nut is conducive to improving the average values of thrust force and torque, and reducing the detent effect.
Highlights
Due to the advantages of physical isolation between moving parts, no gear lubrication, overload protection and reduced maintenance [1], magnetic transmission has drawn increased attention in recent years
2) The cause of the detent effect is revealed in physical sense, which lies in the non-ideal air-gap magnetic field induced by the non-uniform magnetization along the helical permanent magnet (PM). 3) Effective counter-measures are proposed to reduce the detent effect of the magnetic lead screw (MLS)
The detent effect of MLS with parallel magnetized PM segments has been analyzed in this paper
Summary
Due to the advantages of physical isolation between moving parts, no gear lubrication, overload protection and reduced maintenance [1], magnetic transmission has drawn increased attention in recent years. The authors of this paper have established a three-dimensional (3-D) analytical model of the MLS equipped with parallel magnetized PM segments, and the airgap magnetic field, thrust force and torque ware predicted precisely [13]. The transmission characteristics, especially the detent effect of MLS, were not well investigated. The effect of fluxmodulator shape on the transmission torque of magnetic gear was investigated to reduce the torque ripple in [20] and [21]. For the MLS, cogging effect doesn’t exist in principle, non-ideal radially magnetized PMs will result in thrust force ripple and torque ripple. 2) The cause of the detent effect is revealed in physical sense, which lies in the non-ideal air-gap magnetic field induced by the non-uniform magnetization along the helical PM. The innovation of the paper lies that: 1) A 3-D analytical model of MLS is presented to predict the detent effect in an accurate way. 2) The cause of the detent effect is revealed in physical sense, which lies in the non-ideal air-gap magnetic field induced by the non-uniform magnetization along the helical PM. 3) Effective counter-measures are proposed to reduce the detent effect of the MLS
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
